JPH0836938A - Plate-form arc-extinguishing material, its manufacture, and switch using the material - Google Patents

Abstract

PURPOSE:To provide an easily manufacturable arc-extinguishing material in plate form which excels in the heat resistance, arc resistance, and anti-shock performance. can absorb the energy of arcs to make cooling, and turns metal vapor etc., into insulating substance. CONSTITUTION:A plate-form arc-extinguishing material (I) is formed from a sheet consisting of an inorganic sheet for equipping a strength and inorganic binder compound (A), which is subjected to a pressure shaping process and a curing at 120-200 deg.C, and the resultant composition after curing consists of 40-55% inorganic sheet and 45-60% binder compound (B). The inorganic sheet consists in a glass mat formed from glass fiber having electric insulativeness, a glass cloth, or a ceramic paper prepared from ceramic fibers through a paper making process into a thickness of 0.5-2.0mm. The binder compound (A) contains 30-45% compound generating an insulativeness giving gas consisting of a metal hydroxide such as aluminum hydroxide and 0-28% arc-resistant inorganic powder consisting of aluminum oxide etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped arc extinguishing material, a method for manufacturing the same, and a switch using the plate-shaped arc extinguishing material as a side plate of an arc extinguishing chamber. More specifically, it has excellent heat resistance, arc resistance, heat shock resistance, etc. and can be easily prepared. For example, when a contact of an electrode of an electromagnetic contactor, circuit breaker, current limiter, etc. is opened / closed, it is extinguished. The energy of the arc generated in the room is absorbed, cooled and extinguished to protect the equipment from arc heat, and at the same time as opening and closing the electrode, the metal vapor and molten metal droplets generated from the metal in the vicinity of the electrode and contact are insulated. The present invention relates to a plate-shaped arc-extinguishing material having an effect of preventing a decrease in electrical resistance, a manufacturing method thereof, and a switch having an arc-extinguishing chamber using the plate-shaped arc-extinguishing material as an arc-extinguishing side plate.

[0002]

2. Description of the Related Art A general arc extinguishing chamber will be described with reference to a schematic perspective view showing one embodiment of the prior art arc extinguishing chamber shown in FIG.

In FIG. 3, reference numeral 1 designates a plurality of arc-extinguishing magnetic plates having a U-shaped cut 1a in the center thereof, which is formed of, for example, an iron plate. Reference numeral 7 denotes an arc-extinguishing side plate composed of a pair of insulators, and both sides of the magnetic plate 1 are fixed by the caulking portion 3.

Further, FIG. 4 is a side view of a partially cut-away cross section showing an embodiment of a switch of the prior art showing the arc extinguishing operation of the arc extinguishing chamber. In FIG. 4, 1, 3, and 7 are the above 1,
The same parts as 3 and 7 are shown. Reference numeral 4 is a fixed contact, and 5 is a movable contact.

Next, the operation will be described.

In the arc extinguishing chamber constituted by the magnetic plate 1 and the arc extinguishing side plate 7, the fixed contact 4 and the movable contact 5 are energized in a contact state (closed state). When energization is interrupted, the movable contact 5 is moved in the position direction (opened state) shown by the dotted line. At that time, an arc is generated in the gap between the fixed contact 4 and the movable contact 5, and the arc extends in the arrow direction. Is extinguished.

By the way, as a material for the arc-extinguishing side plate that has conventionally constituted the arc-extinguishing chamber, hard fiber, a material obtained by attaching asbestos paper to the inner surface of the hard fiber, a glass-based melamine resin laminate, a glass mat polyester resin An organic-inorganic combination material such as a laminated plate (Japanese Patent Publication No. 2-54609) is mainly used. In addition, those made only of inorganic materials, for example, boric acid-
Laminates of glass fiber sheets using a zinc oxide-based binder (Japanese Patent Publication No. 63-9335), various fired ceramic materials, and the like are used.

However, the hard fiber has a problem that it is decomposed by heat during extinguishing or carbonized by repeated contact with the arc, the insulation resistance is significantly lowered, and further, the fiber is deformed by heat shrinkage.

Further, in the case where asbestos paper is attached to the fiber, there is a possibility that asbestos is scattered by the pressure at the time of arc contact and enters the gap between the contacts 4 and 5, resulting in poor electrical conduction.

Further, the glass-based melamine resin laminated plate has a problem that it is decomposed and carbonized by heat when extinguished.

Further, the glass matte polyester resin laminate is improved in arc resistance by adding an inorganic substance containing crystal water (that is, cooling action by latent heat of vaporization at the time of shutting off moisture physically attached to them, or In order to utilize the arc extinguishing effect of free water, heat dissipation, heat conduction improvement, etc., it is common to add hydrated alumina, aluminum hydroxide, etc. as an inorganic filler, but the surface layer Variations in surface properties such as glass fiber and resin excess layer, which are inferior in arc resistance, occur,
The intended purpose cannot be achieved, and it has the same drawbacks as the melamine resin laminate.

[0012] By the way, the insulation failure after the arc of the switch is caused by the fact that the carbon produced by the thermal decomposition of the organic matter adheres not only to the wall surface of the arc extinguishing chamber but also to the surface of the components inside the switch, resulting in an electrical resistance. It is believed that the cause is a decrease in As a method for preventing such a decrease in electric resistance, a method using an organic substance containing a large number of hydrogen atoms without containing an aromatic ring having a large number of carbon atoms (Japanese Patent Laid-Open No. 63-31053).
No. 4), the formula: Al ₂ O ₃ .3H ₂ O → Al ₂ O ₃ + 3H ₂ O Organic group (HC) + 3H ₂ O → CO (HC) The aluminum hydroxide (Al ₂ O ₃ .3H)
₂ O) as a starting material, and a method utilizing the formation of carbon monoxide or volatile hydrocarbons by the reaction of water of crystallization dissociated from this with an organic group (HC) (JP-A-2-144844) is proposed. Has been done.

However, in recent years, as the demand for miniaturization and higher capacity of switchgear has increased with the miniaturization and weight reduction of electric equipment, the number of organic components used has increased and exposed to arcs. The rate of generating free carbon increases. Therefore, for example, JP-A-63-31
As described in Japanese Patent No. 0534, glass fiber is added to an acrylic ester copolymer or an aliphatic hydrocarbon resin.
A method of using an organic substance containing a large amount of hydrogen atoms and not containing an aromatic ring having a large number of carbons has been proposed. The preventive effect may be insufficient. Further, in the method of using an arc-quenching body formed from a resin containing aluminum hydroxide described in JP-A-2-144844, the water of crystallization dissociated from aluminum hydroxide reacts with an organic group of an organic material. Although the effect of suppressing the generation of free carbon is increased to some extent when it is allowed to stand, on the other hand, the expansion effect caused by the rapid vaporization of crystal water when exposed to an arc causes cracks in the organic material. May occur and damage the product, making it unusable.

On the other hand, Japanese Examined Patent Publication No. 63 consisting of only inorganic materials
The laminated plate of the glass fiber sheet using the boric acid-zinc oxide-based binder described in JP-9335 does not carbonize or decompose,
Although it has excellent wear resistance, it has an insufficient effect of preventing insulation resistance from being reduced by free carbon, and is inferior in mass productivity.

Further, the ceramic material itself does not generate carbon, but when an arc is generated and it is rapidly heated, it is easily damaged by thermal shock, which may cause a serious accident. However, since it is necessary to bake the molded product at a high temperature such as 1300 ° C. or more, energy loss and dimensional shrinkage occur, so that a product having a complicated shape has a poor yield.

By the way, the inventors of the present invention have analyzed the deposits on the inner surface of the switch in detail. It was found that a metal layer is also formed by the generated metal vapor and molten metal droplets, and the formed metal layer greatly contributes to the reduction in electric resistance.

Therefore, it is not possible to sufficiently prevent the reduction of the electric resistance only by suppressing the conventional adhesion of free carbon.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent heat resistance,
It exhibits arc resistance, thermal shock resistance, etc., and can be easily manufactured. It absorbs, cools and extinguishes the energy of the arc generated in the arc extinguishing chamber when the contacts of the electrodes of the switch are opened and closed.
A plate-like eraser that protects the equipment from arc heat and has the effect of insulating metal vapor and molten metal droplets generated from the metal in the vicinity of the electrodes and contacts when the electrodes are opened and closed to sufficiently prevent a decrease in electrical resistance. It is made to provide an arc material, a method for producing the arc extinguishing material, and a switch using the arc extinguishing material as an arc extinguishing side plate of an arc extinguishing chamber.

[0019]

The invention according to claim 1 provides a composition after curing, which is obtained by press-molding and curing a sheet-shaped material comprising an inorganic sheet for strength development and an inorganic binder composition (A). It is a plate-shaped arc-extinguishing material (I) comprising 35 to 50% of an inorganic sheet for strength development and 50 to 65% of an inorganic binder composition (B).

According to a second aspect of the present invention, in the plate-shaped arc-extinguishing material (I) according to the first aspect, the strength-developing inorganic sheet is a glass mat made of insulating glass fiber,
It is a ceramic paper made from glass cloth or ceramic fiber.

According to a third aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the first aspect, the inorganic binder composition (A) is
Insulation-providing gas source compound 30-45%, arc-resistant inorganic powder 0-28%, primary phosphoric acid metal salt aqueous solution 40-
Curing agent 2 to 10 of 65% and primary metal phosphate solution
% Of the inorganic binder composition (I).

According to a fourth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the third aspect, the insulation-providing gas generating source compound is aluminum hydroxide.

According to a fifth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the third aspect, the primary metal phosphate is aluminum monophosphate or magnesium monophosphate.

According to a sixth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the third aspect, the aqueous solution of the primary metal phosphate has a concentration of 25 to 55%.

According to a seventh aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the third aspect, the hardening agent of the aqueous solution of the first metal phosphate is wollastonite crystals or aluminum hydroxide.

The invention of claim 8 is the plate-shaped arc-extinguishing material (I) according to claim 1, wherein the inorganic binder composition (A) is
Inorganic binder composition consisting of 30 to 50% of insulating-providing gas source compound, 0 to 20% of arc resistant inorganic powder, and 50 to 70% of condensed alkali metal phosphate aqueous solution (I
I).

According to a ninth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the eighth aspect, the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate.

According to a tenth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the eighth aspect, the condensed alkali metal phosphate is sodium metaphosphate or potassium metaphosphate.

In the eleventh aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the eighth aspect, the concentration of the condensed alkali metal phosphate aqueous solution is 10 to 40%.

According to a twelfth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the eighth or ninth aspect, the insulating property-providing gas source compound also acts as a curing agent for the aqueous solution of condensed alkali metal phosphate. It is a thing.

According to a thirteenth aspect of the invention, in the plate-shaped arc-extinguishing material (I) according to the third or eighth aspect, the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder.

According to a fourteenth aspect of the present invention, a sheet-like material composed of the strength-developing inorganic sheet and the inorganic binder composition (A) is dried at 80 to 120 ° C. and then pressure-molded to obtain 1
After curing at 20 to 200 ° C., moisture is removed and cured, and then the temperature is cooled to 80 ° C. or lower, and the composition after curing consisting of the inorganic sheet for strength development and the inorganic binder composition (A) expresses strength. It is a method for producing a plate-shaped arc-extinguishing material (I) comprising 35 to 50% of an inorganic sheet for use and 50 to 65% of an inorganic binder composition (B).

According to a fifteenth aspect of the present invention, in the manufacturing method according to the fourteenth aspect, the sheet-like material before pressure molding is 30 to 45% of an insulation-providing gas source compound and 0 to 28% of arc resistant inorganic powder. And a curing agent 2 for the aqueous solution of primary metal phosphate.
-10% are mixed, and then a primary metal phosphate aqueous solution 40
˜65% was added and kneaded to prepare an inorganic binder composition (I), and the strength-developing inorganic sheet was dipped in the inorganic binder composition (I) to prepare a sheet-like material to which the inorganic binder composition (I) was attached. After that, it is dried at 80 to 120 ° C. and the concentration of the aqueous solution of primary metal phosphate in the sheet is adjusted to 65 to 85%.

According to a sixteenth aspect of the present invention, in the production method according to the fifteenth aspect, the insulation-providing gas generating source compound is aluminum hydroxide, and the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder. And the hardener for the aqueous solution of the primary metal phosphate is wollastonite crystals or aluminum hydroxide, and the aqueous solution of the primary metal phosphate has a concentration of the primary aluminum phosphate or the primary magnesium phosphate of 25 to 55%. It is an aqueous solution.

According to a seventeenth aspect of the present invention, in the manufacturing method according to the fourteenth aspect, the sheet-like material before pressure molding is 30 to 50% of the insulation-providing gas source compound and 0 to 20% of the arc resistant inorganic powder. Are mixed, and then 50-70% of an aqueous solution of an alkali metal salt of condensed phosphoric acid is added and kneaded to prepare an inorganic binder composition (II), and the strength-developing inorganic sheet is immersed in the inorganic binder composition (II). The sheet-like material to which the substance (II) is attached is prepared and then dried at 80 to 120 ° C. to adjust the concentration of the condensed alkali metal phosphate aqueous solution in the sheet-like material to 65 to 85%. .

The invention of claim 18 is the method according to claim 17, wherein the insulating source gas generating compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, and the arc resistant inorganic powder is aluminum oxide powder or zircon powder. Alternatively, it is cordierite powder and the aqueous solution of condensed alkali metal salt is an aqueous solution of sodium metaphosphate or potassium metaphosphate having a concentration of 10 to 40%.

A nineteenth aspect of the invention is a sheet obtained by adhering the inorganic binder composition (I) or the inorganic binder composition (II) to the strength-developing inorganic sheet in the production method according to the fourteenth, fifteenth or seventeenth aspects. The amount of the inorganic binder composition (I) or the inorganic binder composition (II) attached to the sheet is 200 to 350 parts with respect to 100 parts (parts by weight, the same applies hereinafter) of the strength-developing inorganic sheet.

According to a twentieth aspect of the present invention, in the manufacturing method according to the fourteenth aspect, at the time of pressure forming, two or more sheet-like materials dried at 80 to 120 ° C. are superposed and formed.

The invention of claim 21 is the invention of claim 14 or 2.
In the production method described in 0, a method of further spraying an insulating property-providing gas generating compound on one side or both sides of the strength-developing inorganic sheet containing the inorganic binder composition (A) during pressure molding.

According to a twenty-second aspect of the invention, in the manufacturing method according to the twenty-first aspect, the insulating property-providing gas source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate.

According to a twenty-third aspect of the present invention, in the manufacturing method according to the twentieth aspect, a sheet-like material to be superposed is prepared by using the inorganic binder composition (I) according to the third aspect, and 80-1
After drying at 20 ° C., the concentration of the aqueous solution of primary metal phosphate is 6
A sheet-like material prepared by using the inorganic binder composition (II) according to claim 8 on one or both sides of the sheet-like material adjusted to be 5 to 85% is dried at 80 to 120 ° C to obtain the sheet. After adjusting the concentration of the aqueous solution of condensed alkali metal phosphate in the product to be 65 to 85%, they are superposed, and the superposed laminated materials are superposed according to the required thickness and pressure-molded. It is a method of curing at ˜200 ° C. to accelerate the removal of water and curing, and then cooling to 80 ° C. or less.

The invention of claim 24 is based on claims 14, 20 and
21. The production method according to 21 or 23, further comprising a step of applying and impregnating a coating agent as a dust generation preventing treatment at the time of punching the plate-shaped arc extinguishing material (I).

According to a twenty-fifth aspect of the present invention, in the production method according to the twenty-fourth aspect, the coating agent is an organic metal compound (metal alkoxide) or an organic resin.

According to a twenty-sixth aspect of the present invention, an insulation-providing gas generating source compound is 40 to 55%, and an arc resistant inorganic powder is 25 to 4%.
Inorganic binder composition consisting of 0%, primary metal phosphate 8 to 18%, primary metal phosphate curing agent 5 to 10%, water 2.6 to 12% and strength expressing inorganic fiber 2 to 10% Plate-shaped arc-extinguishing material (II) formed by pressure molding and curing the object (C)
Is.

According to a twenty-seventh aspect of the present invention, in the plate-shaped arc-extinguishing material (II) according to the twenty-sixth aspect, the insulation-providing gas generating source compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate.

The invention of claim 28 is the plate-shaped arc-extinguishing material (II) according to claim 26, wherein the arc-resistant inorganic powder is zircon powder, cordierite powder or mullite powder.

A twenty-ninth aspect of the invention is the plate-shaped arc-extinguishing material (II) according to the twenty-sixth aspect, wherein the primary metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate. Is.

According to a thirtieth aspect of the present invention, in the plate-shaped arc-extinguishing material (II) according to the twenty-sixth, twenty-seventh or twenty-eighth aspect, the amount of water added to the primary metal phosphate is the primary metal phosphate aqueous solution. It is the amount at which the concentration at that time becomes 60 to 75%.

According to a thirty-first aspect of the invention, in the plate-shaped arc-extinguishing material (II) according to the twenty-sixth aspect, the hardening agent for the primary metal phosphate is wollastonite crystals, magnesium hydroxide, aluminum hydroxide, carbonic acid. Magnesium or calcium carbonate.

According to a thirty-second aspect of the invention, in the plate-shaped arc-extinguishing material (II) according to the twenty-sixth aspect, the strength-expressing inorganic fiber is
It is an inorganic short fiber.

According to a thirty-third aspect of the invention, in the plate-shaped arc-extinguishing material (II) according to the thirty-second aspect, the inorganic short fibers are natural mineral fibers, ceramic fibers or ceramic whiskers.

According to a thirty-fourth aspect of the invention, in the plate-shaped arc-extinguishing material (II) according to the thirty-third aspect, the natural mineral fibers are wollastonite crystals which also act as a hardening agent for the primary metal phosphate.

According to a thirty-fifth aspect of the invention, an insulating property-providing gas generating compound is 40 to 55%, and an arc resistant inorganic powder is 25 to 4
Inorganic binder composition consisting of 0%, primary metal phosphate 8 to 18%, primary metal phosphate curing agent 5 to 10%, water 2.6 to 12% and strength expressing inorganic fiber 2 to 10% The method for producing a plate-shaped arc-extinguishing material (II) is characterized in that the material (C) is pressure-molded in a mold and then cured at 120 to 200 ° C.

According to a thirty-sixth aspect of the present invention, in the manufacturing method according to the thirty-fifth aspect, the insulating property-providing gas source compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate.

According to a thirty-seventh aspect of the present invention, in the manufacturing method according to the thirty-fifth aspect, the arc-resistant inorganic powder is zircon powder,
It is cordierite powder or mullite powder.

According to a thirty-eighth aspect of the present invention, in the production method according to the thirty-fifth aspect, the primary metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate.

According to a thirty-ninth aspect of the invention, in the production method of the thirty-fifth aspect, the hardening agent for the primary metal phosphate is wollastonite crystals, magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate.

The invention of claim 40 is based on claims 1, 2, 3,
4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 2
This is a switch in which an arc-extinguishing chamber using the plate-shaped arc-extinguishing material described in 6, 27, 28, 29, 30, 31, 32, 33, or 34 as an arc-extinguishing side plate is arranged near electrodes and contacts.

[0059]

The plate-shaped arc-extinguishing material (I) of the present invention is an inorganic binder composition in which the composition after curing comprises 35-50% of an inorganic sheet for strength development and 50-65% of an inorganic binder composition (B). Since it is a material having a high content rate of the material (B), it exhibits excellent heat resistance, arc resistance, thermal shock resistance, etc. Moreover, since the content rate of the inorganic sheet for strength development is 35 to 50%, it is excellent. It has excellent mechanical strength and punching workability, and can be easily manufactured. It absorbs the energy of the arc generated in the arc extinguishing chamber when the contacts of the switch electrodes are opened and closed, cools it and extinguishes it, and the arc heat Has the effect of protecting the equipment from.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the strength-developing inorganic sheet is a glass mat made of insulating glass fibers, a glass cloth, or a ceramic paper made from ceramic fibers. Has excellent mechanical strength of the plate-shaped arc-extinguishing material (I),
Good heat resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, the inorganic binder composition (A) comprises an insulating property-providing gas source compound 30 to 45%, an arc resistant inorganic powder 0 to 28%, In the case of the inorganic binder composition (I) consisting of 40 to 65% of metal phosphate aqueous solution and 2 to 10% of curing agent of primary metal phosphate aqueous solution, an inorganic sheet for strength development is integrated, Providing a good plate-shaped arc-extinguishing material (I) with mechanical strength, arc resistance, heat resistance, etc., and insulating metal vapor and molten metal droplets generated from the metal at the electrodes, contacts and their vicinity when the electrodes are opened and closed. And has the effect of sufficiently preventing a decrease in electric resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulation-providing gas source compound is aluminum hydroxide, oxygen atoms / molecules (O, O ₂ ) are used as the insulation-providing gas. Occurs, and the effect of preventing a decrease in electric resistance becomes good.

In the plate-shaped arc-extinguishing material (I) of the present invention, the primary metal phosphate in the inorganic binder composition (A) is
In the case of monoaluminum phosphate or magnesium monophosphate, the solubility in water, the viscosity of the aqueous solution,
Since the binding property is good and the properties are preferable as a binder, the inorganic binder composition (A) can be preferably prepared.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the aqueous solution of the primary metal phosphate in the inorganic binder composition (A) has a concentration of 25 to 55%, the concentration of the aqueous solution is increased. Is easily adjusted to 65 to 85%, and the addition amount of the insulation-providing gas generating source compound and the arc-resistant inorganic powder is set to a predetermined content so that the strength of the inorganic binder composition (A) can be increased. Adhesion is preferable, and a sheet-like material can be easily produced.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the hardening agent for the aqueous solution of the first metal phosphate is wollastonite crystals or aluminum hydroxide, 150
A plate-shaped arc-extinguishing material (I) capable of imparting water resistance to a primary metal phosphate salt by heating at around ℃, and having excellent water resistance
You can get

In the plate-shaped arc-extinguishing material (I) of the present invention, the inorganic binder composition (A) comprises 30 to 50% of an insulating property-providing gas source compound, 0 to 20% of arc resistant inorganic powder and condensed phosphorus. In the case of the inorganic binder composition (II) composed of 50 to 70% of the acid-alkali metal salt aqueous solution, a plate having a larger effect of preventing the reduction of electric resistance than the case of using the above-mentioned inorganic binder composition (I). It becomes the arc-extinguishing material (I).

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulation-providing gas generating compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, aluminum hydroxide is used. Compared with the plate-shaped arc-extinguishing material (I), which has an excellent effect of preventing a decrease in electric resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the condensed alkali metal salt of phosphate in the inorganic binder composition (A) is sodium metaphosphate or potassium metaphosphate, it is dissolved in water. Property, viscosity of aqueous solution, and good binding properties, making it a preferable property as a binder,
The inorganic binder composition (A) can be preferably prepared.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the aqueous solution of the condensed alkali metal phosphate in the inorganic binder composition (A) has a concentration of 10 to 40%, the concentration of the aqueous solution. Is easily adjusted to 65 to 85%, and the addition amount of the insulation-providing gas generating source compound and the arc-resistant inorganic powder is set to a predetermined content so that the strength of the inorganic binder composition (A) can be increased. Adhesion is preferable, and a sheet-like material can be easily produced.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulation-providing gas generating source compound also acts as a curing agent for the aqueous solution of condensed alkali metal phosphate, the condensed alkali metal phosphate is used. The condensed alkali metal phosphate can be made water resistant by reacting with.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the arc-resistant inorganic powder is aluminum oxide powder, it is excellent in arc resistance and electric insulation and also acts as a curing agent. When it is zircon powder or cordierite powder, it has excellent arc resistance and low thermal expansion, and has the effect of improving the thermal shock resistance exhibited by the plate-shaped arc-extinguishing material (I) obtained. It also has the advantage that the raw material cost is low.

The plate-shaped arc-extinguishing material (I) of the present invention is obtained by drying a sheet-like material composed of the strength-developing inorganic sheet and the inorganic binder composition (A) at 80 to 120 ° C., followed by pressure molding. Since it is produced by curing at 120 to 200 ° C. to remove water and curing, and then cooling to 80 ° C. or lower, the excellent plate-shaped arc-quenching material (I) can be easily obtained.

In the above-mentioned production method of the present invention, the sheet-like material before pressure molding is the insulating property-providing gas generating compound 30-
45%, arc-resistant inorganic powder 0 to 28%, and curing agent 2 to 10% of primary metal phosphate aqueous solution are mixed, and then primary metal phosphate aqueous solution 40 to 65% are added and kneaded. An inorganic binder composition (I) is prepared, and a strength-developing inorganic sheet is immersed in the inorganic binder composition (I) to prepare a sheet-like product having the inorganic binder composition (I) attached thereto, followed by drying at 80 to 120 ° C. Since the concentration of the aqueous solution of the primary metal phosphate in the sheet-like material is adjusted to 65 to 85%, the inorganic binder composition (I) has the strength-developing inorganic sheet when pressure-molded. It is possible to obtain a plate-shaped arc-extinguishing material (I) that is dense and has good mechanical strength and the like by integrating with a strength-developing inorganic sheet without protruding.

In the above-mentioned production method of the present invention, the insulation-providing gas source compound is aluminum hydroxide, the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, and the primary phosphate metal salt is used. The curing agent of the aqueous solution is wollastonite crystals or aluminum hydroxide, and the aqueous solution of the primary metal phosphate has a concentration of the primary aluminum phosphate or the primary magnesium phosphate of 25.
When it is a 55% aqueous solution, it has excellent arc resistance, heat resistance, and thermal shock resistance, and has a good effect of preventing a decrease in electric resistance.

In the above-mentioned production method of the present invention, the sheet-shaped material before pressure molding is the insulating property-providing gas generating compound 30 to
50% and arc resistant inorganic powder 0 to 20% are mixed, and then 50 to 70 condensed alkali metal phosphate aqueous solution is added.
% To add and knead to prepare an inorganic binder composition (II), which is then immersed with a strength-developing inorganic sheet to prepare a sheet-shaped article having the inorganic binder composition (II) attached thereto. In the case where the concentration of the aqueous solution of the first metal phosphate in the sheet is adjusted to 65 to 85% by drying at 80 to 120 ° C., the inorganic binder composition (I) described above is used.
It has an effect that the effect of preventing lowering of the electric resistance is greater than that in the case of using.

In the above-mentioned manufacturing method of the present invention, the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, and the arc resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, When the condensed aqueous solution of alkali metal salt of condensed phosphate is an aqueous solution of sodium metaphosphate or potassium metaphosphate having a concentration of 10 to 40%, compared with the above-mentioned manufacturing method using the aqueous solution of primary metal phosphate salt, the electric resistance It has an effect of great reduction prevention effect.

In the above-mentioned production method of the present invention, the inorganic binder composition (I) or the inorganic binder composition (I) in the form of a sheet obtained by adhering the inorganic binder composition (I) or the inorganic binder composition (II) to the strength developing inorganic sheet. Inorganic binder composition (I
When the adhesion amount of I) is 200 to 350 parts with respect to 100 parts of the strength-developing inorganic sheet, it has an effect of excellent heat resistance, arc resistance, and thermal shock resistance.

In the above-mentioned manufacturing method of the present invention, when two or more sheet-like materials dried at 80 to 120 ° C. are superposed and molded at the time of pressure molding, the size (thickness) is larger than that of one sheet. The effect is that the control is easy and the mechanical strength is improved.

In the above-mentioned production method of the present invention, an insulating property-providing gas generating compound is further sprinkled on one or both sides of the strength developing inorganic sheet containing the inorganic binder composition (A) during pressure molding. In this case, it has the effect of further increasing the effect of preventing lowering of the electric resistance as compared with the case of not spraying.

In the above-mentioned production method of the present invention, when the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, the electrical resistance is further reduced as compared with the case where aluminum hydroxide is used. It has the effect of increasing the prevention effect.

In the above-mentioned production method of the present invention, a sheet-like material to be laminated is prepared by using the inorganic binder composition (I) according to claim 3, and dried at 80 to 120 ° C. to form a metal monophosphate salt. A sheet material prepared by using the inorganic binder composition (II) according to claim 8 on one or both sides of a sheet material adjusted to have an aqueous solution concentration of 65 to 85% is dried at 80 to 120 ° C. Then, the concentration of the condensed alkali metal phosphate aqueous solution in the sheet-like material is adjusted to 65 to 85%, and then the sheets are stacked, and the stacked laminated materials are stacked according to the required thickness and pressed. Molded, 1
After curing at 20 to 200 ° C. to accelerate the removal of water and curing, and then cooling to 80 ° C. or lower, the effect of preventing electrical resistance is further improved as compared with the case of using the inorganic binder composition (I) alone. Has the effect of being large.

In the above-mentioned production method of the present invention, as a dust-prevention treatment during punching of the plate-shaped arc-extinguishing material (I), if a step of applying and impregnating a coating agent is further included, cutting or breaking during punching is carried out. This has the effect of reducing the fiber particles generated by the treatment.

In the above production method of the present invention, when the coating agent is an organic metal compound (metal alkoxide) or an organic resin, the coating agent is bonded to the plate-shaped arc-extinguishing material (I) which is the base (base). It has the effects of good properties and high dust prevention.

The plate-shaped arc-extinguishing material (II) of the present invention comprises an insulating property-providing gas source compound 40 to 55%, an arc resistant inorganic powder 25 to 40%, a primary phosphoric acid metal salt 8 to 18%, and Hardening agent of metal monophosphate 5-10%, water 2.6-12
% And strength-developing inorganic fiber 2-10% Inorganic binder composition (C) is a plate-shaped arc-extinguishing material (II) formed by pressure molding and curing, and therefore has excellent heat resistance and arc resistance. Have an effect.

In the plate-shaped arc-extinguishing material (II) of the present invention,
Insulation-providing gas source compound is magnesium hydroxide,
In the case of aluminum hydroxide, magnesium carbonate or calcium carbonate, the aforementioned inorganic binder composition (I
Similar to the plate-shaped arc-extinguishing material (I) produced by using I), it has an effect of large reduction in electric resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the arc resistant inorganic powder is zircon powder, cordierite powder or mullite powder, it has an effect of being excellent in arc resistance and thermal shock resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the monobasic metal phosphate is monobasic aluminum phosphate, monobasic magnesium phosphate or monobasic sodium phosphate, the insulation-providing gas source compound also acts as a curing agent, and a good inorganic bond It has the effect of becoming an agent.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the amount of water added to the primary metal phosphate is such that the concentration of the aqueous primary metal salt solution is 60 to 75%, plasticity occurs during pressure molding, resulting in dense molding. It has the effect of gaining a body.

In the plate-shaped arc-extinguishing material (II) of the present invention,
The primary metal phosphate hardener is wollastonite crystals,
200 ° C if it is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate
It has the effect that a molded product having water resistance can be obtained by heat treatment up to.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the strength-expressing inorganic fiber is an inorganic short fiber, it has an effect of being excellent in heat resistance and being uniformly dispersed.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the inorganic short fiber is a natural mineral fiber, a ceramic fiber or a ceramic whisker, it has an effect of further being excellent in mechanical strength and arc resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the natural mineral fibers are wollastonite crystals that also act as a curing agent for the primary metal phosphate, the unreacted fiber component improves mechanical strength and the reaction component imparts water resistance. Have.

The plate-shaped arc-extinguishing material (II) of the present invention comprises an insulating property-providing gas generating compound (40 to 55%), an arc resistant inorganic powder (25 to 40%), a primary phosphoric acid metal salt (8 to 18%) and Hardening agent of metal monophosphate 5-10%, water 2.6-12
% And the strength-expressing inorganic fiber 2 to 10%, the inorganic binder composition (C) is pressure-molded in a mold and then 120
Since it is produced by curing at ~ 200 ° C, it is possible to obtain the final product such as an arc-extinguishing plate as it is without the need for external processing in many cases.

In the above-mentioned production method of the present invention, when the insulation-providing gas generating compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate, oxygen atoms / molecules (O,
O ₂ ), carbon dioxide (CO ₂ ), and carbon monoxide (CO) are generated, which has the effect of great reduction of the electrical resistance.

In the above-mentioned production method of the present invention, when the arc resistant inorganic powder is zircon powder, cordierite powder or mullite powder, not only the arc resistance is excellent, but also the thermal shock resistance is excellent. Have an effect.

In the above production method of the present invention, when the monobasic metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate, an inorganic binder composition having a strong binding force is obtained. (C) is obtained.

In the above-mentioned production method of the present invention, when the hardening agent for the primary metal phosphate is wollastonite crystal, magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate, the water resistance is 200 ° C. And the mechanical strength is improved.

The switch of the present invention uses the plate-shaped arc-extinguishing material (I) or (II) according to any one of claims 1 to 13 or claim 26 to 34 as an arc-extinguishing side plate. Since the arc-extinguishing chamber is a switch in which electrodes and contacts are arranged in the vicinity of the contacts, the breaking performance, durability performance, and insulation resistance improving performance are excellent.

[0099]

EXAMPLES The plate-shaped arc-extinguishing material (I) of the present invention is a composition after curing, which is obtained by press-molding and curing a sheet-like material composed of an inorganic sheet for strength development and an inorganic binder composition (A). Is a plate-shaped arc-extinguishing material comprising 35 to 50% of a strength-developing inorganic sheet and 50 to 65% of an inorganic binder composition (B).

The strength-developing inorganic sheet is for imparting excellent mechanical strength to the obtained plate-shaped arc-extinguishing material, and has been conventionally used for manufacturing plate-shaped arc-extinguishing materials. As long as it is an inorganic sheet, it can be used without particular limitation.

Specific examples of the strength-developing inorganic sheet include, for example, glass mats or glass cloths made of glass fibers such as E glass, S glass, D glass or silica glass having good insulating properties, and alumina fibers, Thickness 0.5-2.0m obtained by making ceramic fiber such as aluminosilicate fiber
Examples include ceramic paper of about m, and ordinary commercial products can be used.

The above-mentioned inorganic binder composition (A) integrates a strength-developing inorganic sheet to provide a plate-shaped arc-extinguishing material having good mechanical strength, heat resistance, arc resistance and thermal shock resistance, and It protects the equipment from arc heat by absorbing and cooling the energy of the arc when an arc is generated in the arc-extinguishing chamber when the contacts of the electrodes of the switch are opened and closed. It is a component for insulating metal vapor and molten metal droplets generated from a metal to improve electric insulation resistance.

The inorganic binder composition (A) used for producing the above-mentioned sheet is not particularly limited as long as it has the above-mentioned action, but for example, the insulation-providing gas source compound 30 to 45%, arc resistant inorganic powder 0 to 28%, primary metal phosphate aqueous solution 40 to 6
5% and curing agent of primary metal phosphate aqueous solution 2-10%
Inorganic binder composition (I) consisting of 30 to 50% of insulating-providing gas source compound, arc-resistant inorganic powder 0 to 2
0 to 50% and condensed alkali metal phosphate aqueous solution 50-70
% Of the inorganic binder composition (II).

Of the inorganic binder composition (A), the inorganic binder composition (I) will be described first.

The insulation-providing gas generating source compound in the inorganic binder composition (I) generates a gas by an arc generated when the electrodes of the switch are opened and closed, and generates a metal from the electrodes, contacts and the vicinity thereof. The metal vapor and the molten metal droplets are used for insulation.

The process of making the metal vapor and molten metal droplets generated from the metal into an insulator by the insulating property-providing gas generated from the gas generating source compound is considered to be as follows.

That is, when the electrode installed in the arc-extinguishing chamber of the switch is opened / closed, an arc is generated between the contact points of the electrode, and normally 40
The temperature is about 00 to 6000 ° C. As a result, the electrodes,
The contact and the metal in the vicinity of the contact are heated, and metal vapor and molten metal droplets are generated and scattered from the metal. At this time, not only the generated arc, but also the metal vapor or the molten metal droplets heats the insulating property-providing gas source compound contained in the arc-extinguishing side plate of the arc-extinguishing chamber to generate the insulation property-providing gas.

The insulating property-imparting gas is a gas having the property of converting metal vapor and molten metal droplets into an insulator.

The insulating property-imparting gas for insulating the metal vapor and the molten metal droplet from each other is a gas which reacts with the metal vapor and the molten metal droplet.

When a gas that reacts with the metal vapor and the molten metal droplets is generated, the gas reacts with the metal vapor and the molten metal droplets, and the gas reacts with the metal vapor and the molten metal droplets. Reaction products fly, and also unreacted insulation-providing gas generating source compounds fly, so that the insulating material and the originally insulating material are not only the wall of the arc-extinguishing chamber but also the switch. Adhesion to internal component surfaces.

As described above, the metal vapor and the molten metal droplets, which have conventionally greatly contributed to the reduction of the electric resistance, are made into insulators,
A decrease in electric resistance is prevented, and insulation failure after an arc is suppressed.

When the metal vapor or molten metal droplets vigorously flying from the electrode, the contact point and the metal in the vicinity thereof are made into an insulator by the arc, the insulating property-providing gas generated is high in pressure by the arc. Since the metal vapor is generated and expands, the contact portion cannot be approached, and a layer in which the metal vapor or the molten metal droplet is made into an insulator is not formed at the contact portion,
It does not hinder the energization itself.

Examples of the insulative property-providing gas source compound that generates a gas that reacts with the metal vapor and the molten metal droplets as described above include, for example, metal hydroxides and metal carbonates. These are preferably used because they have a large effect of imparting insulating properties.

Typical examples of the metal hydroxide are zinc hydroxide (Zn (OH) ₂ ), aluminum hydroxide (Al (OH) ₃ ), calcium hydroxide (Ca (O)
H) ₂ ), magnesium hydroxide (Mg (OH) ₂ ) and the like.

Further, as typical examples of the metal carbonate, for example, calcium carbonate (CaCO ₃ ), magnesium carbonate (MgCO ₃ ), dolomite (CaMg (Cm)
O ₃ ) ₂ ) and the like.

Of these, aluminum hydroxide is
It is preferable because the reaction with the aqueous solution of the primary metal phosphate is not abrupt, the inorganic binder composition (I) retains an appropriate viscosity, and the insulating property-imparting effect is large.

The insulation-providing gas generating source compound which generates a gas that reacts with the metal vapor and the molten metal droplets may be used alone or in combination of two or more kinds.

When the insulation-providing gas generating source compound is a powder or granular material, the average particle diameter of the powder or granular material is not particularly limited, but mixing in the inorganic binder composition (A) is not limited. In consideration of properties, formability as a plate-shaped arc-extinguishing material, cost, etc.
It is preferably about 6 to 40 μm and, in the case of metal carbonate, usually about 0.3 to 20 μm.

The arc resistant inorganic powder in the inorganic binder composition (I) is a component which imparts excellent arc resistance to the obtained plate-shaped arc extinguishing material (I).

Examples of the arc-resistant inorganic powder include aluminum oxide powder (alumina powder, Al
₂ O ₃ ), zircon powder (zirconium silicate, ZrO ₂ ·
SiO ₂ ), cordierite powder (2MgO.2Al ₂
O ₃・ 5SiO ₂ ), mullite powder (3Al ₂ O ₃・ 2Si)
O ₂ ), magnesium oxide (MgO), zirconium oxide (ZrO ₂ ) and the like. These may be used alone or in combination of two or more.

Among these, aluminum oxide powder, zircon powder, cordierite powder and mullite powder are preferable from the following points.

That is, the aluminum oxide powder is
It has excellent arc resistance and electrical insulation, and also acts as a curing agent for the aqueous solution of primary metal phosphate and the aqueous solution of condensed phosphate alkali salt, which will be described later, and is therefore preferably used in the present invention.

The zircon powder has excellent arc resistance and low thermal expansion, has the effect of improving the thermal shock resistance exhibited by the obtained plate-shaped arc extinguishing material, and has the advantage of being low in raw material cost. Have.

The cordierite powder is excellent in arc resistance, has low thermal expansion, has the effect of improving the thermal shock resistance exhibited by the obtained plate-shaped arc extinguishing material, and is low in raw material cost. It also has advantages.

The mullite powder has excellent heat resistance and low thermal expansion, has the effect of improving the thermal shock resistance exhibited by the obtained plate-shaped arc-quenching material, and also has the advantage of being low in raw material cost. .

The average particle diameter of the arc resistant inorganic powder is not particularly limited, but it is usually preferably about 0.3 to 40 μm from the viewpoint of mixability, dispersibility and cost.

The aqueous solution of the primary metal phosphate in the inorganic binder composition (I) is an inorganic sheet for strength development, an insulating property-providing gas source compound, an arc resistant inorganic powder, and a hardening of the aqueous solution of the primary phosphate metal salt. It is a component that acts as a binder such as an agent.

Specific examples of the first metal phosphate include:
Examples thereof include aluminum monophosphate, magnesium monophosphate, zinc zinc phosphate, calcium phosphate monobasic and the like. Among them, aluminum monophosphate and magnesium monophosphate have high solubility in water, and the viscosity of the aqueous solution has a viscosity suitable as a binder, that is, other components of the inorganic binder composition (I). It is preferable that the inorganic binder composition (I) has favorable properties such as low mixing degree with ease when mixed with, and good adhesion to the strength-developing inorganic sheet, and the like. Used.

If the concentration of the primary metal phosphate aqueous solution is too low, the concentration of the aqueous solution is adjusted to 65% to 85% in order to press-form the sheet-like material, and the plate-shaped arc-extinguishing material. In this case, it tends to take a long time to remove the excess water, so that 25% or more, or even 30
% Or more, and when it is too high, the viscosity increases and the addition amount of the insulation-providing gas generating source compound and the arc-resistant inorganic powder cannot be adjusted to the predetermined content, and the curing agent Since the reaction proceeds rapidly and the production of the plate-shaped arc-quenching material tends to be difficult, it is preferably 55% or less, and more preferably 50% or less.

By the way, the monobasic aluminum phosphate, which is the monobasic metal phosphate, is represented by the formula: Al (H ₂ PO ₄ ) ₃ , and the monobasic aluminum phosphate is not heated by heating below 500 ° C. Since it is water-soluble, it has water resistance and electrical insulation. Therefore, in order to make such a monoaluminum phosphate exhibit water resistance, heating at 500 ° C. or higher is required. Monobasic magnesium phosphate (Mg (H ₂ PO ₄ ) ₃ )
The same applies to. Therefore, in order to make the primary metal phosphate have water resistance, the following curing agents are required.

Aluminum hydroxide is conventionally known as a curing agent for the primary metal phosphate in the inorganic binder composition (I), but other curing agents include wollastonite crystals (CaO. SiO ₂ ), magnesium oxide (MgO), calcium oxide (CaO), zinc oxide (ZnO) and the like. Among them, wollastonite crystals and aluminum hydroxide are preferable.

Since the aluminum hydroxide has a function as an insulating property-providing gas generating source compound, it is necessary to use each as a curing agent for the primary metal phosphate salt and as an insulating property-providing gas generating compound. The amount added may be used.

The wollastonite crystal has a temperature of 150 ° C.
It is a curing agent that can impart water resistance to the primary metal phosphate by heating in the vicinity, and the present inventors have diligently studied a curing agent other than aluminum hydroxide that can be applied to the primary metal salt. It was found as a result of repeating.

The average particle size of the curing agent is not particularly limited, but is usually about 60 μm or less, especially 2 to 40 μm.
About m is preferable from the viewpoints of mixability, dispersibility, and cost.

When the content of the insulating property-providing gas source compound in the inorganic binder composition (I) is too small, it is consumed as a curing agent for the aqueous solution of the primary metal phosphate salt, as described above. Since the insulation-providing gas, which is the original action, will not be generated, it is preferably 30% or more, more preferably 35% or more, and when it is too much, as a binder for the primary metal phosphate. The content is more than the range in which the effect is produced, and it is bulky, has low strength, is easily broken, and it is difficult to obtain a dense plate-shaped arc-extinguishing material. Therefore, it is preferably 45% or less, more preferably 40% or less. .

If the content of the arc resistant inorganic powder in the inorganic binder composition (I) is too large, the resulting arc-shaped plate extinguishing material will have excellent arc resistance, but its strength will be reduced. Since it is easily damaged, it is preferably 28% or less, more preferably 25% or less. When the arc-resistant inorganic powder is not used, by substituting that amount with an insulation-providing gas generating source compound, it is possible to suppress the reduction in arc resistance, so there is no lower limit, but In order to obtain the effect of using the arc resistant inorganic powder, it is preferable to use about 10% or more.

If the content of the aqueous solution of the primary metal phosphate in the inorganic binder composition (I) is too low,
Since it is difficult to obtain a dense plate-shaped arc-extinguishing material, it is preferably 40% or more, more preferably 45% or more. If it is too large, it will be difficult to impart water resistance by the curing agent and strength development will occur. The amount of the aqueous solution deposited on the inorganic sheet for use is reduced, and the strength of the obtained plate-shaped arc extinguishing material becomes low. Therefore, it is preferably 65% or less, more preferably 60% or less.

When the content of the curing agent in the aqueous solution of the first metal phosphate salt in the inorganic binder composition (I) is too low, the temperature at which the water resistance of the first metal phosphate salt develops is the curing agent. Is almost the same as the case of not using, and heating at around 500 ° C. is required, so 2% or more, further 3% or more of the inorganic binder composition (I) is preferable, and if too much, Is too fast to harden the aqueous solution of the primary metal phosphate, so that the time available for the work is shortened. For example, it becomes a solidified substance when the inorganic binder composition (I) is prepared, and the subsequent work cannot be performed. Therefore, 10% or less, more preferably 5% or less of the inorganic binder composition (I) is preferable.

When a curing agent is used within the above range,
The working time can be secured sufficiently, the water resistance temperature of the aqueous solution of the primary metal phosphate is around 150 to 200 ° C, the plate-shaped arc-quenching material is easy to prepare, and the obtained plate-shaped arc-quenching material is resistant to It has excellent arc resistance, mechanical strength, and thermal shock resistance.

When wollastonite crystals are used as the curing agent, the content may be the same,
When using aluminum hydroxide that also acts as the insulation-providing gas source compound, the total amount of the amount used as the curing agent and the amount used as the insulation-providing gas source compound may be used. is necessary. The necessary amount of aluminum hydroxide as a curing agent is not insufficient when the plate-shaped arc-extinguishing material is manufactured while gradually reducing the amount of aluminum hydroxide in the inorganic binder composition (A). The minimum amount is the amount of aluminum hydroxide used as a curing agent, and the amount of aluminum hydroxide used beyond that is the amount used as the insulation-providing gas generating source compound. When wollastonite crystals and aluminum hydroxide are used together as the curing agent, the amount of aluminum hydroxide as the curing agent and the amount of aluminum hydroxide as the insulation-providing gas generating source compound can be determined.

In the present invention, a wollastonite crystal is used as a curing agent, and aluminum hydroxide acts as a gas generating source compound of an insulating property to prevent the insulation resistance from being lowered by an arc. And it is preferable from the viewpoint of imparting water resistance.

Next, the inorganic binder composition (II)
Will be described.

The purpose of use of the insulating property-providing gas generating source compound in the inorganic binder composition (II), specific examples of the insulating property-providing gas generating source compound, and the like are described in the inorganic binder composition (I).
Since it is the same as the insulation-providing gas generating source compound in (3), description thereof will be omitted here. However, if the insulating gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, it partially reacts with the condensed alkali metal salt of phosphoric acid during the production of the plate-shaped arc-extinguishing material and is further subjected to pressure molding. 10% to 25% during curing at 120 to 200 ° C
It is preferable in that it reacts and also acts as a curing agent that imparts water resistance, as in the case of the inorganic binder composition (I).

The above-mentioned magnesium hydroxide, magnesium carbonate or calcium carbonate does not dissolve in the condensed alkali metal phosphate aqueous solution at room temperature, but is in a suspended state.

The purpose of use of the arc-resistant inorganic powder in the inorganic binder composition (II) and the specific examples of the arc-resistant inorganic powder are the same as the arc-resistant inorganic powder in the inorganic binder composition (I). The description is omitted here.

On the other hand, the condensed alkali metal phosphate aqueous solution in the inorganic binder composition (II) acts as a binder as in the case of the primary metal phosphate aqueous solution in the inorganic binder composition (I). It is an ingredient.

Specific examples of the condensed alkali metal phosphate include sodium metaphosphate, potassium metaphosphate, lithium metaphosphate and the like. Among them, sodium metaphosphate and potassium metaphosphate have good solubility in water, and the viscosity of the aqueous solution has a suitable viscosity as a binder, that is, the inorganic binder composition (I
Properties that are preferable for preparing the inorganic binder composition (II), such that the mixing is low at the time of mixing with other components of I) and the binding property is good for adhering to the strength-developing inorganic sheet. And has a low reactivity with the above-mentioned insulation-providing gas generating source compound at room temperature, and is therefore preferably used.

If the concentration of the condensed alkali metal phosphate aqueous solution is too low, the plate-shaped arc-extinguishing material is adjusted by adjusting the concentration of the aqueous solution to 65-85% in order to press-mold the sheet-like material. In this case, it tends to take a long time to remove the excess water, so that it is preferably 10% or more, and more preferably 12% or more. Insulation-providing gas generating source compound, as well as the amount of arc-resistant inorganic powder added cannot be adjusted to the prescribed content, and the reaction with the curing agent rapidly progresses.
Since the plate-shaped arc-extinguishing material tends to be difficult to manufacture, 4
It is preferably 0% or less, more preferably 30% or less.

If the amount of the insulation-providing gas generating source compound used in the inorganic binder composition (II) is too small, the effect as the insulation-providing gas generating source compound will be reduced. It is preferably 30% or more, and more preferably 35% or more of the binder composition (II). If it is too large, it will be contained in a range beyond the effect of the condensed alkali metal phosphate as a binder, and the plate-shaped arc-extinguishing material is bulky and has a small strength and is easily damaged. In some cases, the inorganic binder composition (II) remains in a state of being difficult to prepare, and the subsequent work cannot be performed. Therefore, 50% or less of the inorganic binder composition (II), Furthermore, 45% or less is preferable.

When the insulation-providing gas generating source compound is used within the above range, a sufficient working time can be taken, and the water resistance developing temperature of the condensed alkali metal phosphate aqueous solution is 150 to 200 ° C. In the vicinity, the plate-shaped arc-quenching material is easy to prepare, and the obtained plate-shaped arc-quenching material has excellent arc resistance, strength, and thermal shock resistance.

If the content of the arc-resistant inorganic powder in the inorganic binder composition (II) is too large, the resulting arc-shaped plate extinguishing material will have excellent arc resistance, but its strength will decrease. Since it is easily broken, it is preferably 20% or less, more preferably 15% or less. When the arc-resistant inorganic powder is not used, by substituting that amount with an insulation-providing gas generating source compound, it is possible to suppress the reduction in arc resistance, so there is no lower limit, but In order to obtain the effect of using the arc resistant inorganic powder, it is preferable to use about 10% or more.

If the content of the aqueous solution of the condensed alkali metal phosphate in the inorganic binder composition (II) is too small, it becomes difficult to obtain a dense plate-shaped arc-extinguishing material. Further, it is preferably 55% or more, and when it is too large, the amount of the aqueous solution deposited on the strength-developing inorganic sheet decreases, and the strength of the obtained arc-quenching material becomes low, so 70% or less, Further, it is preferably 65% or less.

The plate-shaped arc-extinguishing material (I) of the present invention is prepared by pressure-forming and curing a sheet-like material prepared from the strength-developing inorganic sheet and the inorganic binder composition (A) as described above. is there. The contents of the pressure molding / curing are the same as the description of the production method of the plate-shaped arc-extinguishing material (I) described later, and therefore will be described in the production method.

In the preparation of the above-mentioned sheet-like material, in addition to the above-mentioned raw materials, a binder such as methyl cellulose, polyvinyl alcohol, etc., a glass frit, etc. may be added, if necessary, within a range not impairing the object of the present invention. A colorant such as a ceramic color may be appropriately mixed.

The inorganic binder composition (B) which constitutes the plate-shaped arc-extinguishing material (I) of the present invention is made by integrating the strength-developing inorganic sheet into a mechanical strength, heat resistance, arc resistance and heat resistance. While providing a good plate-shaped arc-extinguishing material with impact resistance,
When the arc of the arc extinguishing chamber is generated when the contacts of the switch electrodes are opened and closed, the energy of the arc is absorbed, cooled, and extinguished.
It is a component for protecting the equipment from arc heat and improving the electric insulation resistance by insulating the metal vapor and molten metal droplets generated from the metal at the electrodes, contacts and their vicinity when the electrodes are opened and closed.

The inorganic binder composition (B) is obtained after the inorganic binder composition (A) attached to the strength-developing inorganic sheet is dried, pressure-molded and cured. Therefore, the water content derived from the aqueous solution of the primary metal phosphate or the condensed alkali metal phosphate in the inorganic binder composition (A) is lost, while the solid content remains adhered after the curing reaction. Further, when the obtained plate-shaped arc-extinguishing material (I) was heated to 200 ° C. and examined for weight loss, no weight loss was found. Therefore, the approximate composition of the inorganic binder composition (B) is obtained by using the inorganic binder composition (I) as the inorganic binder composition (A), and the insulating property imparting gas generating compound 40 is obtained. ~ 55%, arc resistant inorganic powder 0 to 34% and primary metal phosphate reaction cured product 26 ~
Insulation-providing gas source compound 42 to 65%, arc-resistant inorganic substance, which can be obtained when the inorganic binder composition (II) is used as the inorganic binder composition (A). Powders of 0 to 28% and condensed phosphoric acid alkali metal salt cured products of 34 to 40% are available. In addition,
The curing agent for the aqueous solution of primary metal phosphate is not necessarily 100%.
Although it does not always react, it is included in the reaction product of the primary metal salt of phosphoric acid as a reaction product.

When the content of the strength-developing inorganic sheet in the plate-shaped arc-extinguishing material (I) of the present invention is too small,
A large amount of the inorganic binder composition (B) is attached,
Although it is excellent in arc resistance and the effect of generating insulation-providing gas, the plate-shaped arc-extinguishing material has excellent workability in the plate shape on the arc-extinguishing side. Since the arc-extinguishing property cannot be maintained due to peeling and dropping due to the generation of the insulating property-providing gas, it is adjusted to 35% or more, preferably 37% or more. Since the amount of the composition (B) deposited becomes too small, the arc resistance and the gas generation effect of the insulating property imparted by the plate-shaped arc extinguishing material are lost, and the properties as the plate-shaped arc extinguishing material cannot be maintained. Therefore, 5
It is adjusted to 0% or less, preferably 45% or less.

The value of 50 to 65% of the content of the inorganic binder composition (B) in the plate-shaped arc-extinguishing material (I) of the present invention is difficult to adhere to the conventional strength-developing inorganic sheet, and even after curing after adhesion. Even if it is exposed to the arc, it is a high content that has not been used because it easily falls off. In the present invention, since a large amount of the inorganic binder composition (B) is contained as described above, the arc resistance and the gas generation effect imparting the insulation property are excellent.

The plate-shaped arc-extinguishing material (I) of the present invention has a thickness of 0.2 to 1.5 m obtained by press-molding and curing one sheet-shaped product.
A plate-shaped arc-extinguishing material having a thickness of m, preferably 0.4 to 1.2 mm may be used, and two or more sheets, preferably 2 to 5 sheets laminated, are pressure-molded and cured to a thickness of 0.5 to A plate-shaped arc extinguishing material of 3 mm, preferably 0.8 to 2.0 mm may be used.

When a plate-shaped arc-extinguishing material is produced from one sheet-like material, a plate-shaped arc-extinguishing material is further sprayed on one surface or both surfaces thereof with an insulating property-providing gas generating compound. It may be. Further, the plate-shaped arc-extinguishing material (I) may be coated and impregnated with a coating agent to prevent dust generation during punching.

The insulating property-providing gas generating source compound to be sprayed is preferably the insulating property-providing gas generating source compound described above and having an average particle size of about 0.3 to 40 μm.

It is preferable that the insulating property generating gas source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate in terms of the large insulating property providing effect.

When spraying, it is not necessary to use a binder which is usually used, but the above-mentioned coating agent may be used as a binder.

The amount of the insulating gas generating source compound sprayed is usually about 200 to 450 g / m ² per side.

The coating / impregnation amount of the coating agent is usually about 40 to 100 g / m ^{2 on} one side.

Specific examples of the coating agent include organic metal compounds (metal alkoxides) such as ethyl silicate, methyl silicate and tributoxy aluminum, organic resins such as acrylic resins, epoxy resins and polyester resins. To be

When two or more of the above sheet-like materials are laminated, the sheet-like material prepared using the inorganic binder composition (I) is prepared by using the inorganic binder composition (II) on one or both sides. Normally, a sheet having a thickness of 1.1 to 3.0 mm, which is a required thickness of 0.8 to
It is preferable to stack so as to have a thickness of 2.5 mm from the viewpoint of mechanical strength and punching workability.

When two or more of the above sheet-like materials are laminated, one or both surfaces of the sheet-like material may be sprayed with an insulating-conducting gas generating source compound, and further a coating agent may be applied / impregnated.

Next, a method for producing the plate-shaped arc extinguishing material (I) of the present invention will be described.

The plate-shaped arc-extinguishing material (I) of the present invention is a sheet-shaped product obtained by preparing a sheet-shaped product from the strength-developing inorganic sheet as described above and the inorganic binder composition (A) as described above. Is dried at 80 to 120 ° C. and then pressure-molded. While being pressure-molded or after pressure-molding, 120-
After curing at 200 ° C to remove water and cure, 80
It is produced by cooling to below ℃.

The inorganic binder composition (A) is prepared by
It can be carried out by various methods without particular limitation, as long as the components constituting the composition are uniformly dispersed.
For example, after the solid components in the inorganic binder composition (A) are mixed by using a mixer such as a stirrer, a liquid component (primary metal phosphate solution or condensed alkali metal phosphate solution) is added. It is performed by adding and kneading.
When prepared in this manner, the inorganic binder composition (A)
It is preferable from the viewpoint that the solid components therein are homogeneously mixed and dispersed, partial reaction with the liquid components can be avoided, and the liquid components are uniformly mixed.

For example, in the case of preparing the inorganic binder composition (I), 30 to 45% of an insulating property-providing gas source compound which is a solid component, 0 to 28% of arc resistant inorganic powder, and a monobasic metal phosphate. 2 to 10% of a curing agent of an aqueous salt solution is mixed, and then a liquid metal phosphate monobasic salt aqueous solution 40
By adding and kneading ~ 65% to prepare an inorganic binder composition (I), a solid component is homogeneously dispersed in a primary metal phosphate aqueous solution which is a liquid component, which is suitable as a binder. A composition having properties such as a viscous slurry (slurry) can be obtained.

Specific examples of the above-mentioned inorganic binder composition (I) include, for example, the insulating property-providing gas source compound is aluminum hydroxide, and the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordier. Light powder, the hardener for the aqueous solution of the primary metal phosphate is wollastonite crystals or aluminum hydroxide, and the aqueous solution of the primary metal phosphate salt is a concentration of aluminum phosphate monobasic or magnesium monophosphate 25- An example is a composition prepared from a 55% aqueous solution.

When preparing the inorganic binder composition (II), 30 to 50% of an insulating property-providing gas source compound and 0 to 20% of arc resistant inorganic powder are solid components.
And then add and knead 50-70% of an aqueous solution of condensed alkali metal phosphate as a liquid component to prepare an inorganic binder composition (II). It is possible to obtain a composition having a property such as a slurry (slurry) in which a solid component is homogeneously dispersed in an aqueous salt solution and having a viscosity suitable as a binder.

Inorganic binder composition (II) as described above
As a specific example of, for example, the insulation-providing gas source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, condensed phosphoric acid The alkali metal salt aqueous solution has a sodium metaphosphate or potassium metaphosphate concentration of 10 to 40.
% Aqueous solution.

At this time, the concentration of the aqueous solution of the primary metal phosphate or the aqueous solution of the condensed alkali metal phosphate of the inorganic binder composition (I) or (II) is the same as that before the kneading.

The inorganic binder composition having the above-mentioned properties makes it easy to continuously prepare a sheet-like material, and has good adhesion to the voids and the surface of the strength-developing inorganic sheet.

The method for preparing a sheet-like material from the above-described inorganic binder composition and strength-developing inorganic sheet is not particularly limited. For example, the strength-developing inorganic sheet is dipped in a predetermined inorganic binder composition. , Pulling, a method of obtaining a predetermined impregnation rate, a roll coating method of supplying a predetermined inorganic binder composition (A) from between rolls to a strength-developing inorganic sheet, a doctor blade method of applying through a blade adjusted to a constant thickness, etc. The method of is mentioned as a concrete method.

Inorganic binder composition (I) in a sheet form in which the inorganic binder composition (I) or the inorganic binder composition (II) is adhered to the strength-developing inorganic sheet.
Alternatively, the adhesion amount of the inorganic binder composition (II) is 200 to 350 parts with respect to 100 parts of the strength-developing inorganic sheet for ease of transportation during sheet preparation, and plate-shaped arc-extinguishing material after curing ( The thickness of I) becomes preferable, and the weight ratio of the inorganic sheet for strength development after curing and the inorganic binder composition (B) is preferably in a proper range, and is preferably 250 to
It is more preferably 300 parts.

The sheet-like material thus prepared is
The inorganic binder composition (A) is in a soft and easily deformable state in which water is retained, and the obtained sheet-like material is
After drying at 80 to 120 ° C. (for example, in an oven), the concentration of the aqueous solution of primary metal phosphate or the aqueous solution of condensed alkali metal phosphate is 65 to 85%, preferably 75 to 80%. As prepared. When the obtained sheet-like material is directly subjected to pressure molding, the impregnated inorganic binder composition (A) exudes from the strength-developing inorganic sheet, and the plate-shaped arc-extinguishing material (I) having a desired composition cannot be obtained. Is.

When the concentration of the aqueous solution of primary metal phosphate or the aqueous solution of condensed alkali metal phosphate exceeds 85%, it does not deform even when pressure-molded, and the inorganic bond is bonded to the gap of the strength developing inorganic sheet. When the agent composition (A) is not densely packed or when two or more sheet-shaped materials are laminated, the adhesive bond between the sheet-shaped materials becomes insufficient. Also, as described below,
When stacking sheet-like materials in which the concentration of the primary metal phosphate aqueous solution or the condensed alkali metal phosphate aqueous solution is laminated, it is preferable that the concentration is about 70 to 80% because the interlayer adhesiveness is better. Therefore, it is preferable.

In the production method of the present invention, it is extremely important to adjust the concentration of the aqueous solution of primary metal phosphate or the aqueous solution of condensed alkali phosphate.

The sheet-like material dried at 80 to 120 ° C. is then pressure-molded.

If the pressure during the pressure molding is too low, the pressure will be insufficient to cause variations in the tightness of the plate-shaped arc-extinguishing material before curing, or if the sheet-shaped materials are laminated, the interface Since there is a risk that unbonded parts may remain on the
It is preferably 0 kg / cm ² or more, and when it is too large, the inorganic binder composition (I) or (I
Since I) may flow out from the strength-developing inorganic sheet and expose the strength-developing inorganic sheet, the characteristics of the plate-shaped arc-extinguishing material may be deteriorated. Therefore, it is preferably 200 kg / cm ² or less.

In the present invention, such pressure molding may be carried out at room temperature, or may be carried out by appropriately heating a press platen or the like. Also, the time for pressure molding may be adjusted appropriately. Examples of the apparatus used for pressure molding include a pressure press equipped with a surface plate such as a hand press, a mechanical press, and a hydraulic press.

The thus obtained plate-shaped arc-extinguishing material before curing is naturally left for about one day and night, and then placed in an oven, for example, and is cured by heating at 120 to 200 ° C. to accelerate curing and remove water to cure. After letting it 80
The plate-shaped arc-extinguishing material (I) is produced by cooling to a temperature of not higher than 0 ° C.

[0187] The temperature at which such heating and curing is performed is
If it is too low, it takes a long time to proceed with curing, and even if it is cured, the formation of a compound capable of imparting water resistance to the primary metal phosphate or the condensed alkali metal phosphate is insufficient. Therefore, it is necessary to be 120 ° C or higher, preferably 150 ° C or higher, and if it is too high,
Only the surface layer portion of the molded product is rapidly hardened and the reaction with the inside becomes non-uniform and warpage occurs, so it is necessary to be 200 ° C or lower, preferably 180 ° C or lower. In addition, after such heating and curing, warp occurs in the plate-shaped arc-extinguishing material that is a molded product due to rapid cooling, so from the viewpoint of preventing this, it is cooled to 80 ° C. or less, preferably 50 ° C. or less. It The cooling may be natural slow cooling or cooling under a stepwise condition by program control.

When pressure-molding a sheet material dried at 80 to 120 ° C., as described above, an appropriate number of sheets are stacked in order to improve mechanical strength and adjust product dimensions. It may be pressure-molded together. At this time, in order to increase the amount of the insulating property-providing gas generated, the insulating property-providing gas source compound may be further sprayed on one side or both sides of the sheet-like material. For spraying, for example, in a state where the sheet material is dried at 80 to 120 ° C. (approximated by touching with a finger), it is passed through a 35-mesh sieve to make the insulating source gas-generating compound have a uniform thickness on the sheet material. It is carried out like sieving.

Further, the inorganic binder composition (II) was used on one or both sides of the sheet-like material using the inorganic binder composition (I) in order to increase the generation amount of the gas having a greater insulating effect. It is also possible to stack the sheet-like materials and press-mold them by stacking an appropriate number of them in accordance with the desired thickness.

In these cases, the plate-shaped arc-extinguishing material of the present invention is also prepared by pressure-molding, aging at 120 to 200 ° C. as described above to remove water, curing and cooling to 80 ° C. or less. (I) is obtained.

A coating agent may be applied / impregnated to prevent dust generation during punching of the plate-shaped arc-extinguishing material (I). When applying a coating agent, a method such as roll coating, spray coating, or brush coating is used. Also,
When impregnating, the plate-shaped arc-extinguishing material (I) is filled with a coating agent in a container in which the plate-shaped arc-extinguishing material (I) can be sufficiently dipped, and the plate-shaped arc-quenching material (I) is dipped in the container, and if necessary, a vacuuming operation is performed. Is done by adding.

The plate-shaped arc extinguishing material (I) thus obtained is subjected to desired machining such as outer shape processing and hole processing to form an arc extinguishing plate, and an arc extinguishing chamber is formed from the arc extinguishing plate and the magnetic plate. You can get it.

The plate-shaped arc-extinguishing material (II) of the present invention comprises an insulating property-providing gas source compound 40 to 55%, an arc resistant inorganic powder 25 to 40%, a primary metal phosphate 8 to 18% and Hardening agent of metal monophosphate 5-10%, water 2.6-12
% And the strength-developing inorganic fiber 2 to 10%, a plate-shaped arc-extinguishing material obtained by pressure molding and curing an inorganic binder composition (C).

Compared with the inorganic binder composition (A), the inorganic binder composition (C) does not require adjustment of the concentration of the aqueous solution of the first metal phosphate and has good moldability (the arc-quenching plate shape during molding). It is possible to provide a plate-shaped arc-extinguishing material (II) having excellent mechanical strength.

The purpose of using the insulating property-providing gas generating compound in the inorganic binder composition (C), the process of insulating metal vapor with the insulating property-providing gas generated from the gas generating compound, and the gas generation process. The specific examples of the source compound and the average particle diameter when the gas generating source compound is a powder or granular material are the same as those used for the plate-shaped arc-extinguishing material (I), and therefore the description thereof is omitted here.

Among the compounds for generating insulation-providing gas, magnesium hydroxide, aluminum hydroxide, carbonic acid, etc. are large in terms of the amount of insulation-providing gas generated and the effect of imparting insulation to the generated insulation-providing gas. Magnesium and calcium carbonate are preferred.

The purpose of use of the arc-resistant inorganic powder in the inorganic binder composition (C), specific examples of the inorganic powder, preferred specific examples and reasons therefor, and the average particle diameter are as described above in the plate-shaped arc-extinguishing material (I). Since it is the same as that used in (), the description is omitted here. However, although aluminum oxide powder could be preferably used in the plate-shaped arc-extinguishing material (I), the plate-shaped arc-extinguishing material (II) did not use the strength-developing inorganic sheet, and thus was manufactured by thermal shock. Material (II)
Therefore, aluminum oxide powder having insufficient thermal shock resistance cannot be mentioned as a preferable one.

The primary metal phosphate in the inorganic binder composition (C) is a gas generating source compound for imparting insulation, an arc resistant inorganic powder, a curing agent for primary metal phosphate, a strength-developing inorganic fiber, etc. It is a component that acts as a binder of.

Specific examples, preferable specific examples and reasons thereof of the first metal phosphate are the same as those used for the plate-shaped arc extinguishing material (I), and therefore the description thereof is omitted here.

When the concentration of the aqueous solution of the first metal phosphate is too low, the binding force of the inorganic binder composition (C) becomes small and the plasticity is not exhibited, so that a precise molded product can be obtained. Since it is not possible to obtain dimensional accuracy, 60
% Or more, and more preferably 65% or more. If it is too high, the viscosity increases and the reaction with the curing agent rapidly progresses, making it difficult to prepare the inorganic binder composition (C). Moreover, even if the composition (C) is obtained, the composition (C) easily adheres to the inside of the mold during pressure molding, resulting in mold releasability and high dimensional accuracy. Since it is difficult to get it, 75% or less, and even 7
2% or less is preferable.

As the curing agent for the aqueous solution of the primary metal phosphate in the inorganic binder composition (C), wollastonite crystals (CaO.SiO ₂ ), magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate are used. And so on. Among these, wollastonite crystals are a curing agent that can impart water resistance to the primary metal phosphate by heating at around 150 ° C. as described above. It was found as a result of extensive research on a curing agent applicable to salt. As will be described later, the wollastonite crystals also effectively act as the strength-expressing inorganic fibers of the plate-shaped arc-quenching material (II).

Among the above-mentioned hardeners, magnesium hydroxide, aluminum hydroxide, magnesium carbonate and calcium carbonate are preferable because they act as the insulation-providing gas generating source compound.

The average particle size of the curing agent is not particularly limited, but is usually about 60 μm or less, further 2 to 40 μm.
It is preferable that the degree is from the viewpoints of mixability, dispersibility, and cost.

The water in the inorganic binder composition (C) is an aqueous solution of the above-mentioned primary metal phosphate having an appropriate concentration to give the inorganic binder composition (C) excellent moldability and plate shape. It is for making the arc-quenching material (II) exhibit mechanical strength.

The strength-expressing inorganic fiber in the inorganic binder composition (C) is a component for imparting excellent mechanical strength to the obtained plate-shaped arc-quenching material (II).

As the strength-expressing inorganic fibers, inorganic short fibers which are excellent in arc resistance and electric insulation and can be easily mixed uniformly with other materials are preferable. Examples of the inorganic short fibers include natural mineral fibers such as wollastonite crystals, silica-alumina glass fibers (aluminum silicate fibers; amorphous, Al ₂ O ₃ : SiO ₂ = 47: 53, 56:44, etc.), Alumina fiber (crystalline, Al ₂ O ₃ : SiO
₂ = 95: 5, etc., ceramic fibers, aluminum borate whiskers (9Al ₂ O ₃ .2B ₂ O ₃ ), silicon carbide whiskers (SiC), silicon nitride whiskers (Si ₃ N ₄ ), calcium carbonate whiskers, etc. Ceramic whiskers and so on. These may be used alone or in combination of two or more. Among these, natural mineral fibers, ceramic fibers and ceramic whiskers are preferable because they are excellent in arc resistance and electric insulation and can be easily mixed uniformly with other constituents of the inorganic binder composition (C).

The average fiber diameter and average fiber length of the strength-developing inorganic fiber are not particularly limited as long as they are commercially available, but in the case of wollastonite crystals, the average fiber diameter is 1 to 10 μm. , An average fiber length of about 20 to 50 μm, in the case of silica-alumina glass fibers, an average fiber diameter of 1 to
15 μm, average fiber length 2 to 100 μm, alumina fiber fit average fiber diameter 1 to 10 μm, average fiber length 30 to 100 μm, aluminum borate whisker fit average fiber diameter 0.5 to 1 μm, average fiber length 10 ~ 3
0 μm, average fiber diameter of silicon carbide whiskers of 0.05 to 10 μm, average fiber length of 5 to 40 μm, average fiber diameter of silicon nitride whiskers of 0.2 to 1 μm
m, an average fiber length of about 5 to 200 μm, a calcium carbonate whisker having an average fiber diameter of 0.5 to 1 μm, and an average fiber length of about 20 to 30 μm can be suitably used.

When the content of the insulating property-providing gas source compound in the inorganic binder composition (C) is too small, it is consumed as a curing agent for the primary metal phosphate as described above, and the original action is obtained. Since the insulation-providing gas is not generated, it is adjusted to 40% or more, preferably 45% or more, and further 50% or more. The content of the metal salt is more than the range in which the effect as a binder is produced, and it is bulky, low in strength, easily broken, and difficult to obtain a dense arc-extinguishing material. Adjust it to be 52% or less.

When the content of the arc resistant inorganic powder in the inorganic binder composition (C) is too small, the arc resistance exhibited by the plate-shaped arc extinguishing material (II) is reduced, and the plate-shaped arc extinguishing material is obtained. Since the property as (II) cannot be retained, the plate-like arc-extinguishing material (II) is adjusted to 25% or more, preferably 30% or more. Although it has excellent arc resistance, the strength is lowered and it is easily damaged, so the content is adjusted to 40% or less, preferably 35% or less.

If the content of the primary metal phosphate in the inorganic binder composition (C) is too small, it becomes difficult to obtain a dense plate-shaped arc-extinguishing material (II). The content is preferably adjusted to 10% or more, and when it is too large, it becomes difficult to impart water resistance by the curing agent, so the content is adjusted to 18% or less, preferably 15% or less.

When the content of the curing agent for the primary metal phosphate in the inorganic binder composition (C) is too small, the curing agent is used at a temperature at which the primary metal phosphate exhibits water resistance. There is no big difference from the case where it is not used, and since heating at around 500 ° C. is required, 5% of the inorganic binder composition (C)
Above, preferably adjusted to be 7% or more, and when it is too much, the working time of the work is shortened because the hardening of the aqueous solution of the primary metal phosphate is too fast. Since it becomes a solidified substance during the preparation of the substance (C), and problems such as the inability to perform the subsequent work may occur. Therefore, the content of the inorganic binder composition (C) should be 10% or less, preferably 9% or less. adjust.

In the present invention, when the curing agent is used within the above range, the working time can be sufficiently secured, and the water resistance developing temperature of the primary metal phosphate salt aqueous solution is 150 to 200 ° C.
The plate-shaped arc-extinguishing material (II) is easily prepared, and the plate-shaped arc-extinguishing material (II) that can be obtained has arc resistance, strength,
It has excellent thermal shock resistance.

When wollastonite crystals are used as the curing agent, the content may be the same,
When using aluminum hydroxide, magnesium hydroxide, magnesium carbonate, or calcium carbonate that also acts as the insulating property-providing gas source compound, the amount used as a curing agent and the insulating property-providing gas source compound are used. It is necessary to use the amount and the total amount. The necessary amount as a curing agent such as the aluminum hydroxide,
For example, when the plate-shaped arc-extinguishing material (II) is produced while gradually reducing the amount of aluminum hydroxide in the inorganic binder composition (C), the minimum amount at which the curing is not insufficient is water as the curing agent. It becomes the amount of aluminum oxide, and the amount of aluminum hydroxide used beyond that amount becomes the amount as the insulation-providing gas generating source compound. When wollastonite crystals and aluminum hydroxide which also acts as an insulating property-providing gas source compound are used together as the curing agent, the amount of aluminum hydroxide as the curing agent and the insulating property-providing gas source compound are also used. The amount of aluminum hydroxide or the like can be determined.

In the present invention, wollastonite crystals are used as the curing agent, and aluminum hydroxide, magnesium hydroxide, magnesium carbonate and calcium carbonate are used as the insulation-providing gas generating source compound to prevent the reduction of the insulation resistance due to the arc. Therefore, it is preferable that the plate-shaped arc-extinguishing material (II) exerts its original effect to the maximum.

As described above, the amount of water added to the inorganic binder composition (C) is such that the concentration of the aqueous solution of the primary metal phosphate can be adjusted to a preferable range, particularly 60 to 75%, to obtain a precise molded article. At least 2.6% or more, preferably 5% or more, and further 6% or more are necessary from the viewpoint of being easily disintegrated, and when it is too much, a sludge state is generated at the time of preparation of the inorganic binder composition (C). Since it becomes difficult to work, it is necessary to set the content to 12% or less, preferably 10% or less, and further 8% or less.

When the content of the strength-developing inorganic fiber in the inorganic binder composition (C) is too small, the mechanical strength (bending strength) of the obtained plate-shaped arc-extinguishing material (II) is reduced and Since the characteristics of the arc-extinguishing material (II) cannot be retained, the content is adjusted to 2% or more, preferably 3% or more. Since it is contained in a range more than the range where the effect as a binder is produced, it is bulky, has low strength, is easily broken, and it becomes difficult to obtain a dense plate-shaped arc-quenching material (II). It is preferably adjusted to 8% or less.

Inorganic binder composition (C) in the present invention
In addition to the components as described above, if necessary, a binder such as methyl cellulose, polyvinyl alcohol, etc., a glass frit, a coloring agent such as a ceramic color, etc. may be appropriately used as long as the object of the present invention is not impaired. You may mix.

The plate-shaped arc-extinguishing material (II) of the present invention is obtained by pressure-molding and curing the inorganic binder composition (C) as described above. The contents of the pressure molding / curing will be described in the method of manufacturing the plate-shaped arc extinguishing material (II) described later.

The composition of the obtained plate-shaped arc extinguishing material (II) is
Since there is no water in the inorganic binder composition (C),
Approximately 46 to 55% of insulating-providing gas source compound, 33 to 45% of arc resistant inorganic powder, 18 to 35% of primary metal phosphate reaction cured product, and strength developing inorganic fiber 3-1.
2%. It should be noted that the curing agent for the aqueous solution of the first metal phosphate salt is not necessarily 100% reacted, but is described as being included in the first metal phosphate reaction cured product as the total amount of the reaction. In addition, the obtained plate-shaped arc extinguishing material (II)
When it was heated to 00 ° C. and examined for weight loss, no weight loss was found.

The plate-shaped arc-extinguishing material (II) of the present invention has a thickness of, for example, 0.5 to 2.5 mm, preferably 0.8 to 2.0.
mm.

Next, a method for producing the plate-shaped arc extinguishing material (II) of the present invention will be described.

The plate-shaped arc-extinguishing material (II) of the present invention was prepared by preparing the above-described inorganic binder composition (C), press-molding the composition in a mold, and then curing at 120 to 200 ° C. It is manufactured by

The above-mentioned inorganic binder composition (C) is prepared by
There is no particular limitation as long as the components constituting the composition are uniformly dispersed, and various methods can be used. For example, the solid content of the inorganic binder composition (C) (insulating property-providing gas source compound, Arc resistant inorganic powder, primary metal phosphate, hardener and strength-producing inorganic fiber),
For example, after mixing using a mixer such as a stirring and crushing machine, a predetermined amount of water is added dropwise little by little and kneaded to prepare an inorganic binder composition (C). When prepared in this manner, water is evenly added to the monobasic metal phosphate uniformly mixed and dispersed in the solid content to form a homogeneous plate-shaped arc-extinguishing material (II).
It is preferable from the viewpoint that the inorganic binder composition (C) can be obtained.

The above-mentioned inorganic binder composition (C) has a property such as a granulated body in which secondary particles which can be easily filled in a mold are formed.

The inorganic binder composition (C) having the above-mentioned properties can be easily filled into the mold continuously, and further, it is plastically deformed in the mold at the time of pressure molding and densely packed. It has the property of forming a dense molded product.

Specific examples of the above-mentioned inorganic binder composition (C) include, for example, an insulating property-providing gas source compound of magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate, and an arc-resistant inorganic powder. Is a zircon powder, cordierite powder or mullite powder, and the primary metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate, and a curing agent for the primary metal phosphate. Is a wollastonite crystal or the above magnesium hydroxide, and a composition prepared from water and a strength-developing inorganic fiber.

In the case of the composition, a plate-shaped arc extinguishing material (II) which is excellent in mold filling and moldability and which is heat-cured.
It is preferable that (molded product, etc.) serves as an insulating property-providing gas generating source having excellent arc resistance and mechanical strength.

Next, the inorganic binder composition (C) is filled in, for example, a mold having a desired arc-quenching plate shape and pressure-molded. If the pressure during the pressure molding is too low, the pressure may be insufficient to cause variations in the tightness of the molded product. Therefore, the pressure should be 400 kg / cm ² or more, further 500 kg / cm ² or more. If it is too large, the inorganic binder composition (C) will flow into the gap between the molds, and the molds tend to fit into each other, making it difficult to open the molds. Therefore, 800 kg / cm ² Below, 7
It is preferably 50 kg / cm ² or less. In the present invention, such pressure molding may be carried out at room temperature, or may be carried out by appropriately heating a press platen or the like.
Also, the time for pressure molding may be adjusted appropriately. Examples of the apparatus used for pressure molding include a hand press, a mechanical press, and a hydraulic press equipped with a surface plate that can be molded to have a uniform thickness.

The plate-shaped arc-extinguishing material thus obtained before curing is naturally allowed to stand for one day and night, and then placed in, for example, an oven and heated and cured at 120 to 200 ° C. to accelerate curing and remove water. By
A plate-shaped arc extinguishing material (II) is obtained.

[0230] The temperature at which such heating and curing is performed is
If it is too low, it takes a long time to proceed with curing, and even if it is cured, the formation of a compound capable of imparting water resistance to the primary metal phosphate is insufficient.
It is necessary to be 20 ° C. or higher, preferably 150 ° C. or higher, and when it is too high, only the surface layer part of the molded product is rapidly hardened and the reaction with the inside becomes non-uniform, causing warpage.
It is necessary to be 200 ° C. or lower, preferably 180 ° C. or lower. Moreover, after performing such heating and curing, the plate-shaped arc-extinguishing material may be appropriately and gradually cooled.

The plate-shaped arc-extinguishing material (II) thus obtained does not need to be machined or has little machining since outer shape processing, hole processing and the like can be completed at the time of molding. Therefore, the heat-cured plate-shaped arc-extinguishing material (II) can be used as the arc-extinguishing plate and the arc-extinguishing side plate as it is in many cases. You can get it.

Next, the switch of the present invention will be described.

The switch of the present invention is the plate-shaped arc extinguishing material (I).
Alternatively, an arc-extinguishing chamber using the plate-shaped arc-extinguishing material (II) as an arc-extinguishing side plate is arranged near the electrodes and contacts. The structure and shape of the switch of the present invention are the same as those of the conventional switch, and the arc-extinguishing plate such as the arc-extinguishing side plate is formed from the plate-like arc-extinguishing material (I) or the plate-like arc-extinguishing material (II). That is the feature of the switch of the present invention. The type of the switch of the present invention is not particularly limited, but examples thereof include an electromagnetic contactor, a circuit breaker, and a current limiter that generate an arc in the arc extinguishing chamber when the contact of the electrode is opened and closed.

First, the arc extinguishing chamber will be described.

FIG. 1 is a schematic perspective view showing an embodiment of an arc extinguishing chamber according to the present invention. Reference numeral 1 denotes a plurality of arc-extinguishing magnetic plates having a U-shaped cut 1a at the center thereof, which is formed of, for example, an iron plate or a chrome-plated iron plate. Two
Is an arc-extinguishing side plate made of the plate-shaped arc-extinguishing material (I) or (II) of the present invention, and two arc-extinguishing side plates are used in a pair. The arc extinguishing side plate 2 and the magnetic plate 1 are fixed by a caulking portion 3.

The electrodes and contacts are electrodes and contacts of, for example, an electromagnetic contactor, a circuit breaker, a current limiter, etc., and are usually made of, for example, Ag-WC alloy or Ag-CdO alloy. Are formed from etc.

The vicinity of the electrodes and the vicinity of the contacts is the same as the arc exposure position in the conventional switch, for example, 5 to 15 cm for the electromagnetic contactor and 5 to 15 cm for the circuit breaker.
The current limiter is about 5 to 30 cm.

FIG. 2 is a side view of a scribed partial cross section showing an embodiment of the switch of the present invention. In FIG. 2, 1, 2, and 3 indicate the same parts as 1, 2, and 3 in FIG. Reference numeral 4 is a fixed contact, and 5 is a movable contact.

In the arc extinguishing chamber constituted by the magnetic plate 1 and the arc extinguishing side plate 2, the fixed contact 4 and the movable contact 5 are energized in a contact state (closed state). When energization is interrupted, the movable contact 5 is moved in the position direction (opened state) shown by the dotted line. At that time, an arc is generated in the gap between the fixed contact 4 and the movable contact 5, and the arc extends in the arrow direction. Then it is extinguished.

The plate-shaped arc-quenching material (I) or (I of the present invention
The arc-extinguishing side plate consisting of I) has excellent heat resistance, arc resistance, and thermal shock resistance, and absorbs the energy of the arc generated in the arc-extinguishing chamber, quenches it, and protects the equipment from arc heat. Since it is possible to solve problems such as lowering of electrical resistance by making the electrodes, metal vapor and molten metal droplets generated from the metal in the vicinity of the contacts and the electrodes in the vicinity thereof into an insulator when opening and closing the contacts of the electrodes of the switch, The switch of the present invention using the plate-shaped arc-extinguishing material (I) or (II) also has a very excellent effect.

When the plate-shaped arc extinguishing material (I) is the plate-shaped arc extinguishing material (I) of claim 2, there is an advantage that the electrical insulating property is further improved and the mechanical strength is excellent.

When the plate-shaped arc-extinguishing material (I) is the plate-shaped arc-extinguishing material (I) of claim 3, the preparation is easier, and the heat resistance, arc resistance, and electrical resistance are prevented from lowering. It has the advantage of being excellent.

When the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) of claim 4, aluminum hydroxide also acts as a curing agent for the aqueous solution of the primary metal phosphate. Therefore, there is an advantage that it is further excellent in water resistance and has an effect of preventing reduction in electric resistance.

In the case where the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) according to claim 5, since it further has solubility and viscosity in water suitable as a binder, There is an advantage that the plate-shaped arc-extinguishing material (I) is uniformly adhered to the inorganic sheet and becomes dense.

When the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) of claim 6, the inorganic binder composition (I) can be more easily prepared and a sheet-shaped product can be prepared. Also has the advantage of being easy.

When the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) of claim 7, there is an advantage that further excellent water resistance is imparted.

When the plate-shaped arc-extinguishing material (I) is the plate-shaped arc-extinguishing material (I) of claim 8, it is easier to prepare and has the effect of preventing lowering of heat resistance, arc resistance and electric resistance. It has the advantage of being excellent.

When the plate-shaped arc-extinguishing material (I) is the plate-shaped arc-extinguishing material (I) of claim 9, there is an advantage that the effect of preventing a decrease in electric resistance is further excellent.

When the plate-shaped arc-extinguishing material (I) is the plate-shaped arc-extinguishing material (I) of claim 10, there is an advantage that the insulation-providing gas generating source compound can be easily added.

When the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) of claim 11, the inorganic binder composition (II) can be more easily prepared, and a sheet-shaped product can be prepared. Also has the advantage of being easy.

When the plate-shaped arc-quenching material (I) is the plate-shaped arc-quenching material (I) of claim 12, there is an advantage that the compounding of a curing agent which imparts water resistance can be omitted.

When the plate-shaped arc extinguishing material (I) is the plate-shaped arc extinguishing material (I) of claim 13, there is an advantage that it is further excellent in heat resistance and arc resistance.

When the plate-shaped arc-extinguishing material (II) is the plate-shaped arc-extinguishing material (II) of claim 26, it is easier to prepare and has the effect of preventing a decrease in heat resistance, arc resistance and electric resistance. It has the advantage of being excellent.

When the plate-shaped arc-extinguishing material (II) is the plate-shaped arc-extinguishing material (II) of claim 27, the effect of preventing lowering of electric resistance is further provided as compared with the plate-shaped arc-extinguishing material (II). It has the advantage of being excellent.

When the plate-shaped arc extinguishing material (II) is the plate-shaped arc extinguishing material (II) of claim 28, there is an advantage that it is further excellent in arc resistance and thermal shock resistance.

In the case where the plate-shaped arc-quenching material (II) is the plate-shaped arc-quenching material (II) of claim 29, the plate-shaped arc-quenching material (II) further has solubility and viscosity in water suitable as a binder. There is an advantage that the arc-quenching material (II) is densified.

When the plate-shaped arc-extinguishing material (II) is the plate-shaped arc-extinguishing material (II) of claim 30, there is an advantage that plasticity is further generated during pressure molding and a dense molded body is obtained. is there.

When the plate-shaped arc-quenching material (II) is the plate-shaped arc-quenching material (II) of claim 31, there is an advantage that water resistance is further imparted.

When the plate-shaped arc extinguishing material (II) is the plate-shaped arc extinguishing material (II) of claim 32, there is an advantage that it is further excellent in heat resistance.

When the plate-shaped arc extinguishing material (II) is the plate-shaped arc extinguishing material (II) of claim 33, there is an advantage that it is further excellent in arc resistance and mechanical strength.

When the plate-shaped arc extinguishing material (II) is the plate-shaped arc extinguishing material (II) of claim 34, there is an advantage that the water resistance is further developed and the mechanical strength is improved.

Next, the plate-shaped arc-extinguishing materials (I) and (II) of the present invention, the method for producing the plate-shaped arc-quenching materials (I) and (II), and the plate-shaped arc-quenching material (I) or (II). The switch using the above will be described in more detail based on examples, but the present invention is not limited to these examples.

[Examples 1 to 10] Of the components of the inorganic binder composition (I) shown in Table 1, the solid content, that is, the insulating property-providing gas source compound, the arc resistant inorganic powder, and the curing agent were used as Ishikawa. After mixing for 30 minutes with a type stirring grinder, a predetermined primary metal phosphate solution was added and kneaded for 15 minutes to prepare an inorganic binder composition (I).

Next, a 30 cm square, 0.2 mm thick (for glass cloth) and 0.5 mm (for glass mat and ceramic paper) strength-imparting inorganic sheet was applied to the inorganic binder composition (I). An impregnated sheet having the amount of the inorganic binder composition (I) adhered therein as shown in Table 1 was prepared by immersing the sheet in the impregnated sheet. The impregnated sheet was put in a vat, and moisture was removed until the concentration of the aqueous primary metal phosphate solution reached 65% while curing was carried out in an oven at 80 ° C., to produce a sheet material before pressing.

Next, the obtained sheet material before pressing was pressure-molded at room temperature at 150 kg / cm ² -G for 1 minute to obtain a molded product. The obtained molded article was left to stand naturally for 1 day, then placed in an oven, heated from room temperature to 200 ° C. at a heating rate of 5 ° C./min, held for 1 hour to be cured, and then naturally cooled.
A plate-shaped arc extinguishing material (I) was obtained. Table 2 shows the composition and thickness of the obtained plate-shaped arc extinguishing material (I). It was confirmed that in the inorganic binder composition (I) attached to the plate-shaped arc-extinguishing material (I), only water was dried and removed. Further, when the plate-shaped arc-extinguishing material (I) was heated to 200 ° C. and examined for weight loss, no weight loss was found.

After that, the dust-preventing coating agent shown in Table 1 was applied (brushed) on both sides of the plate-shaped arc-extinguishing material (I) and dried. The coating amount of the coating agent is all in Examples 1 to 10,
It was 9 g, 4.5 g on each side. The method of quantifying the amount of coating agent adhered was calculated by measuring the weight change after curing.

The obtained plate-shaped arc-extinguishing material (I) was punched and subjected to external shape processing to obtain an arc-extinguishing side plate. Two of the obtained arc-extinguishing side plates were prepared, and the arc-extinguishing side plates were combined to produce the arc-extinguishing chamber (length 30 mm, width 20 mm, height 50 mm) shown in FIG.

The switch shown in FIG. 2 was manufactured using the obtained arc-extinguishing chamber. The distance between the arc-extinguishing chamber and the contact is the farthest point 2
It was cm.

The abbreviations, compounds and glass mats, glass cloths and ceramic papers used as the inorganic sheet for strength development shown in Table 1 are as follows (the same applies to the following tables).

A: Aluminum hydroxide, average particle size 0.8
μm Alumina powder: Aluminum oxide powder, average particle size 0.3
μm (350 mesh all products) Zircon powder: Zirconium silicate powder, average particle size 16μ
m (350 mesh all products) Cordierite powder: average particle size 7.5 μm, manufactured by Mars Glaze Co., Ltd., trade name SS-200 Aluminum monophosphate: manufactured by Nacalai Tesque, Inc., powdered reagent Daiichirin Magnesium acid: manufactured by Nacalai Tesque, Inc., powdered reagent B: wollastonite crystal, all 350 mesh products, manufactured by Kinsei Matec, trade name FPW-350 glass mat: manufactured by E glass, manufactured by Asahi Fiber Co., Ltd. , Unit weight 455 g / m ² Product name CM455FA Glass cloth: Silica glass, Asahi Schubel Co., Ltd.
Manufactured, 0.2 mm thick Product name 7628 style 44 × 33 / inch Ceramic paper: Aluminosilicate, Toshiba Monocrax Co., Ltd., 0.5 mm thickness, product name Fiber Flux NO. 300 Dust prevention coating agent (a): Ethyl silicate containing 20% Si, manufactured by TSB, trade name TSB4
200 Dust-prevention coating agent (b): acrylic resin, manufactured by Mitsubishi Kasei Co., Ltd., trade name MASACO Aluminum hydroxide, which is the abbreviation A in Table 1, is an amount that acts as a curing agent and an insulation-providing gas source. The amounts acting as compounds are described separately (the same applies hereinafter).

Further, with respect to the obtained switch, a breaking test, a durability test and a meg measurement test shown below were conducted.
Table 2 shows the results.

(Overload cutoff test) According to the measurement method for a breaker for wiring described in JIS C8370, a current which is 6 times the rated current in a closed state (for example, in the case of a rated current of 100A, three-phase 550V / 600A condition will be applied),
A test in which the movable contact and the fixed contact are separated from each other to generate an arc current and the arc current is interrupted by succeeding a specified number of times (50 times).

(Durability test) Three phases 55 in the closed state
A current of 0 V / 100 A is applied, and the movable contact is mechanically opened from this state to generate an arc current, the arc current is interrupted a prescribed number of times (6000 times), and the arc wear resistance of the arc-extinguishing side plate ( Specifically, there is no hole) to pass the test.

(Meg measurement test) In the closed state, an excessive current of three-phase 460 V / 25 kA is flowed to open the movable contact, generate an arc current, and pass the cutoff of the arc current. A test in which the insulation resistance between the terminals is measured using the insulation resistance meter described in JIS C1302 after the short circuit test. The result is the load-side interphase insulation resistance (M
Ω) indicates the minimum value.

[0275]

[Table 1]

[0276]

[Table 2] It can be seen from Table 2 that the switch of this example has an excellent breaking performance after passing the breaking test of 50 times in the breaking test and the durability test of 6000 times. This shows the superiority of the plate-shaped arc-quenching material (I) obtained in this example. After the test, when visually observing the part of the arc-extinguishing side plate that was in contact with the arc, there was almost no damage,
It turns out that it is good.

As a result of the Meg measurement test, the specified value of 0.5
It can be seen that the arc-extinguishing side plate made of the plate-shaped arc-extinguishing material (I) of the present invention possesses an excellent effect of improving the insulation resistance by clearing MΩ.

[Examples 11 to 20] 120 impregnated sheets were used.
200 kg at room temperature, two sheets of pre-pressurized sheet-like materials produced in the same manner as in Examples 1 to 10 except for being dried at ℃.
/ Cm ² -G pressure molding for 1 minute, the molded product obtained 1
Examples 1 to 10 except that curing was performed at 80 ° C for one day and night.
Each plate-shaped arc-extinguishing material (I) was obtained in the same manner as above, and a coating agent for preventing dust generation was applied and dried. An arc-extinguishing side plate was obtained using the obtained plate-shaped arc-extinguishing material (I), and an arc-extinguishing chamber and a switch similar to those in Examples 1 to 10 were manufactured. In addition, in Table 3, the inorganic binder composition (I) used, the amount of the inorganic binder composition (I) attached to 100 parts of the strength developing inorganic sheet,
A plate-shaped arc-extinguishing material (I) showing a dust-prevention coating agent
The composition and thickness of are shown in Table 4.

Regarding the obtained switch, Examples 1 to 1
The same evaluation test as in Example 10 was performed, and the results are shown in Table 4.

[0280]

[Table 3]

[0281]

[Table 4] As can be seen from Table 4, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 11 to 20 are the same as Examples 1 to 1.
It has the same excellent performance as 0. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 21 to 26] In Example 4 and 7, except that the insulating property-providing gas generating compound shown in Table 5 was sprayed on one side or both sides of the sheet material before pressing. A plate-shaped arc extinguishing material (I), an arc extinguishing side plate, an arc extinguishing chamber, and a switch were manufactured in the same manner as in Steps 7 and 7. The insulation-providing gas generating source compound was sprayed through a 35-mesh sieve over the entire surface of the pre-pressed sheet material to a uniform thickness. In addition, the application amount was calculated by measuring and subtracting the amount that did not adhere to the sheet-like material among the amounts used for application.

Table 5 shows the type of sheet material before pressurization for each example (the example number of the sheet material before pressurization), the type of insulating gas generating source compound and the amount of spray and the prevention of dust generation. The types of coating agents are shown.

The compounds used in Table 5 are as follows.

Magnesium hydroxide: average particle size 0.6 μ
m, manufactured by Nacalai Tesque, Inc., powder reagent Magnesium carbonate: average particle size 0.4 μm, manufactured by Nacalai Tesque, Inc., reagent powder Calcium carbonate: average particle size 0.3 μm, manufactured by Nacalai Tesque, special grade reagent E Table 6 shows the results obtained by performing the same evaluation test as in Examples 1 to 10 on the thickness of the plate-shaped arc extinguishing material (I) and the switch.

[0286]

[Table 5]

[0287]

[Table 6] As can be seen from Table 6, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 21 to 26 are the same as Examples 1 to 1.
It has the same excellent performance as 0. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 27 to 32] Two sheets of the material sprayed with the insulation-providing gas generating source compound produced in Examples 21 to 26 were stacked (in the case of Example 27, the compound was not sprayed). 21) except that the surfaces are overlapped)
A plate-shaped arc extinguishing material (I), an arc extinguishing side plate, an arc extinguishing chamber, and a switch were manufactured in the same manner as in No. 26.

Table 7 shows the type of sheet material before pressurization for each example (the example number of the sheet material before pressurization), the type of the insulating source gas generating source compound, and the spray amount and the prevention of dust generation. The types of coating agents are shown.

Table 8 shows the results obtained by performing the same evaluation test as in Examples 1 to 10 on the thickness and the switch of the obtained plate-shaped arc-extinguishing material (I).

[0291]

[Table 7]

[0292]

[Table 8] As can be seen from Table 8, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 27-32 are the same as Examples 1-1.
It has the same excellent performance as 0. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 33 to 42] Of the inorganic binder composition (II) shown in Table 9, the solid content, that is, the insulating property-providing gas source compound, and the arc-resistant inorganic powder were mixed with Ishikawa type agitator machine. After 30 minutes of mixing, the inorganic binder is prepared by adding a predetermined aqueous solution of an alkali metal salt of condensed phosphoric acid (described in the table as an aqueous solution of a condensed metal salt of phosphoric acid, the same hereinafter) and kneading for 15 minutes. Composition (II) was used, and the concentration of the aqueous solution of condensed alkali metal phosphate was 65
A plate-shaped arc-extinguishing material (I) was obtained in the same manner as in Examples 1 to 10 except that the sheet-like material before pressurization in which the water content was removed to 10% was produced. Further, the arc-extinguishing material was punched and subjected to external shape processing to obtain an arc-extinguishing side plate. However, the dust prevention coat was not applied. An arc extinguishing chamber and a switch were manufactured using the obtained arc extinguishing side plate.

The compounds and abbreviations used in Table 9 are as follows.

Sodium metaphosphate: manufactured by Nacalai Tesque, Inc., reagent powder Potassium metaphosphate: manufactured by Nacalai Tesque, Inc., reagent powder C: Magnesium hydroxide (same as used in Examples 21 to 26) D: Carbonic acid Magnesium (same as used in Examples 21-26) E: Calcium carbonate (same as used in Examples 21-26) Composition and thickness of the obtained plate-shaped arc extinguishing material (I), and opening and closing. Table 10 shows the results obtained by performing the same evaluation test as in Examples 1 to 10 on the container.

[0296]

[Table 9]

[0297]

[Table 10] As can be seen from Table 10, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 33 to 39 are the same as those in Examples 1 to 1.
It has excellent performance similar to 10. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 43 to 52] Two sheets of the pre-pressurizing sheet-like materials produced in Examples 33 to 42 are stacked at 200 k at room temperature.
A plate-shaped arc-quenching material (I) was obtained in the same manner as in Examples 33 to 42 except that pressure molding was performed at g / cm ² -G for 1 minute (abbreviations in Table 11 and compounds are the same as those in Table 9). Is). Further, using the plate-shaped arc-extinguishing material (I), arc-extinguishing side plates, arc-extinguishing chambers and switches similar to those in Examples 1 to 10 were manufactured.

Table 12 shows the composition and thickness of the obtained plate-shaped arc-extinguishing material (I), and the results obtained by performing the same evaluation test as in Examples 1 to 10 on the switch.

[0300]

[Table 11]

[0301]

[Table 12] As can be seen from Table 12, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 43 to 52 are the same as those in Examples 1 to 1.
It has excellent performance similar to 10. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 53 to 60] Examples 4, 7, and 33
And 39, a sheet before pressure is prepared by removing water until the concentration of the aqueous solution of the primary metal phosphate and the alkali metal salt of condensed phosphate becomes 85%, respectively, and the material before pressure (4) is produced. , (7), (33), and (39). Two sheets of the sheet material (I) before pressurization and the sheet material (II) before pressurization shown in Table 13 were superposed on each other, and the temperature was 200 ° C.
Examples 53 to 56 were carried out in the same manner as in Examples 1 to 10 except that pressure molding was performed at 200 kg / cm ² -G for 1 minute under heating.
The plate-shaped arc extinguishing material (I) was obtained. Moreover, the sheet-form material (II) before pressure is applied to both surfaces of the sheet-form material (I) before pressure described in Table 13.
Example 5 was repeated except that (3 sheets were stacked in total).
The plate-shaped arc-quenching materials (I) of Examples 57 to 60 were obtained in the same manner as 3 to 56. Furthermore, Example 1 using the plate-shaped arc extinguishing material
The arc-extinguishing side plate, arc-extinguishing chamber, and switch similar to those of Nos. 10 to 10 were manufactured.

Table 13 shows the results obtained by performing the same evaluation test as in Examples 1 to 10 on the thickness and the switch of the obtained plate-shaped arc-extinguishing material (I).

[0304]

[Table 13] As can be seen from Table 13, the plate-shaped arc-extinguishing material (I) and the switch of the present invention obtained in Examples 53 to 60 are the same as those in Examples 1 to 1.
It has excellent performance similar to 10. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Examples 61 to 77] Tables 14 and 15
In the inorganic binder composition (C) described in 1., the solid content, that is, the insulating property-providing gas source compound, the arc-resistant inorganic powder, the primary phosphate metal salt, the curing agent, and the strength-developing inorganic fiber are agitated by the Ishikawa method. After mixing with a crusher for 30 minutes, predetermined water was added dropwise with a syringe for 15 minutes to prepare a material before pressurization.

The compounds used in Tables 14 and 15 are as follows.

F: Zircon powder (same as that used in Examples 1-10) G: Cordierite powder (same as that used in Examples 1-10) H: Mullite powder, average particle size 4 μm (350 All mesh products I: Monobasic aluminum phosphate (same as used in Examples 1 to 10) J: Magnesium monophosphate (same as used in Examples 1 to 10) K: First phosphorus Sodium acid, manufactured by Nacalai Tesque, Inc.
Reagent powder L: Aluminum borate whiskers, average fiber diameter 0.6μ
m, average fiber length 25 μm, manufactured by Shikoku Kasei Co., Ltd., trade name Arvolex M: SiC whisker, average fiber diameter 0.08 μm, average fiber length 7 μm, manufactured by Tateho Chemical Industry Co., Ltd., trade name SCW N: calcium carbonate Whisker, average fiber diameter 0.6μm,
Average fiber length 25 μm, Shikoku Kasei Co., Ltd., trade name Whiskal O: silica-alumina glass fiber, average fiber diameter 10 μm,
Average fiber length 60 μm, manufactured by Isolite Industrial Co., Ltd., trade name Kaowool milled fiber P: Si ₃ N ₄ whiskers, average fiber diameter 0.5 μm, average fiber length 130 μm, manufactured by Tateho Chemical Industry Co., Ltd., trade name SN
W In Tables 14 and 15, the compounds of the abbreviations A and C (the contents are the same as above) are divided into the amount acting as a curing agent and the amount acting as an insulation-providing gas generating source compound, and the abbreviations are used. B (wollastonite crystals) is described separately for the amount acting as a curing agent and the amount acting as a strength-expressing inorganic fiber.

Next, the obtained pre-pressurized material was 40 mm in length, 50 mm in width, and 5 in depth in the arc-extinguishing side plate shape shown in FIG.
It was filled in a metal mold of 700 mm and pressure-molded at room temperature at 700 kg / cm ² -G for 1 minute to obtain a molded product having an arc-extinguishing side plate shape. This molded product was left to stand naturally for 1 day, then placed in an oven, heated from room temperature to 200 ° C at a heating rate of 5 ° C / min, held for 3 hours for curing, and then naturally cooled to extinguish the side plate ( A plate-shaped arc extinguishing material (II) was obtained. Further, using the arc-extinguishing side plate, an arc-extinguishing chamber and a switch similar to those in Examples 1 to 10 were manufactured.

The obtained switches were subjected to the same evaluation tests as in Examples 1 to 10, and the results are shown in Tables 16 and 17.

[0310]

[Table 14]

[0311]

[Table 15]

[0312]

[Table 16]

[0313]

[Table 17] As can be seen from Tables 16 and 17, the plate-shaped arc-extinguishing materials (II) and switches of the present invention obtained in Examples 61 to 77 have excellent performance as in Examples 1 to 10. After the test, the portion of the arc-extinguishing side plate that was in contact with the arc was visually observed, and it was found that there was almost no damage and that it was good.

[Comparative Example 1] Acrylic acid ester copolymer (polymethylmethacrylate) containing 30% of glass fiber in accordance with the description of JP-A-63-310534, containing no carbon-rich aromatic ring, 1mm thick and 300mm x 300mm in size, using an organic substance containing a large amount of hydrogen
Was prepared and processed into an arc-extinguishing side plate having the same size and thickness as in Example 1.

Using the arc-extinguishing side plates thus obtained, Examples 1 to 10 were performed.
An arc-extinguishing chamber and a switch were manufactured in the same manner as in, and an evaluation test was performed in the same manner as in Examples 1-10. The results are shown in Table 17.

[Comparative Example 2] A glass cloth-polyester resin composite plate was molded by adding 30% hydrated alumina to a polyester resin as a filler (Grasmer manufactured by Nikko Kasei Co., Ltd.) and had the same size as in Example 1. Processed to a thickness of arc-extinguishing side plate.

Using the arc-extinguishing side plate thus obtained, Examples 1 to 10 were performed.
An arc-extinguishing chamber and a switch were manufactured in the same manner as in, and an evaluation test was performed in the same manner as in Examples 1-10. The results are shown in Table 17.

As can be seen from Table 17, Comparative Examples 1 and 2 were far below the standard value of 0.5 MΩ in the Meg measurement test.

[0319]

INDUSTRIAL APPLICABILITY The plate-shaped arc-extinguishing material (I) of the present invention has an inorganic bond in which the composition after curing comprises 35-50% of an inorganic sheet for strength development and 50-65% of an inorganic binder composition (B). Since it is a material having a high content rate of the agent composition (B), it exhibits excellent heat resistance, arc resistance, thermal shock resistance and the like, and since the content rate of the inorganic sheet for strength development is 35 to 50%. It has excellent punching workability, mechanical strength, etc., and can be easily manufactured. It absorbs the energy of the arc generated in the arc extinguishing chamber when the contacts of the switch electrodes are opened and closed, and then extinguishes it by cooling. It has the effect of protecting the equipment from arc heat.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the strength-developing inorganic sheet is a glass mat, glass cloth or ceramic fiber-made ceramic paper made of insulating glass fiber. Has excellent mechanical strength of the plate-shaped arc-extinguishing material (I),
Good heat resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, the inorganic binder composition (A) comprises an insulating property-providing gas source compound 30 to 45%, an arc resistant inorganic powder 0 to 28%, In the case of the inorganic binder composition (I) consisting of 40 to 65% of metal phosphate aqueous solution and 2 to 10% of curing agent of primary metal phosphate aqueous solution, an inorganic sheet for strength development is integrated, Providing a good plate-shaped arc-extinguishing material (I) with mechanical strength, arc resistance, heat resistance, etc., and insulating metal vapor and molten metal droplets generated from the metal at the electrodes, contacts and their vicinity when the electrodes are opened and closed. And has the effect of sufficiently preventing a decrease in electric resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulation-providing gas source compound is aluminum hydroxide, oxygen atoms / molecules (O, O ₂ ) are used as the insulation-providing gas. Occurs, and the effect of preventing a decrease in electric resistance becomes good.

In the plate-shaped arc-extinguishing material (I) of the present invention, the primary metal phosphate in the inorganic binder composition (A) is
In the case of monoaluminum phosphate or magnesium monophosphate, the solubility in water, the viscosity of the aqueous solution,
Since the binding property is good and the properties are preferable as a binder, the inorganic binder composition (A) can be preferably prepared.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the aqueous solution of the primary metal phosphate in the inorganic binder composition (A) has a concentration of 25 to 55%, the concentration of the aqueous solution is Is easily adjusted to 65 to 85%, and the addition amount of the insulation-providing gas generating source compound and the arc-resistant inorganic powder is set to a predetermined content so that the strength of the inorganic binder composition (A) can be increased. Adhesion is preferable, and a sheet-like material can be easily produced.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the hardening agent for the aqueous solution of the first metal phosphate is wollastonite crystals or aluminum hydroxide, 150
A plate-shaped arc-extinguishing material (I) capable of imparting water resistance to a primary metal phosphate salt by heating at around ℃, and having excellent water resistance
You can get

In the plate-shaped arc-extinguishing material (I) of the present invention, the inorganic binder composition (A) comprises 30 to 50% of an insulating property-providing gas source compound, 0 to 20% of arc resistant inorganic powder and condensed phosphorus. In the case of the inorganic binder composition (II) composed of 50 to 70% of the acid-alkali metal salt aqueous solution, a plate having a larger effect of preventing the reduction of electric resistance than the case of using the above-mentioned inorganic binder composition (I). It becomes the arc-extinguishing material (I).

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulating source gas generating compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, it is more preferable to use aluminum hydroxide. Also has an excellent effect of preventing reduction in electric resistance.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the condensed alkali metal salt of phosphate in the inorganic binder composition (A) is sodium metaphosphate or potassium metaphosphate, it is dissolved in water. Property, viscosity of aqueous solution, and good binding properties, making it a preferable property as a binder,
The inorganic binder composition (A) can be preferably prepared.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the aqueous solution of the condensed alkali metal phosphate in the inorganic binder composition (A) has a concentration of 10 to 40%, the concentration of the aqueous solution is Is easily adjusted to 65 to 85%, and the addition amount of the insulation-providing gas generating source compound and the arc-resistant inorganic powder is set to a predetermined content so that the strength of the inorganic binder composition (A) can be increased. Adhesion is preferable, and a sheet-like material can be easily produced.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the insulation-providing gas-generating source compound also acts as a curing agent for the aqueous solution of the alkali metal salt of condensed phosphate, the condensed alkali metal salt of condensed phosphate is used. The condensed alkali metal phosphate can be made water resistant by reacting with.

In the plate-shaped arc-extinguishing material (I) of the present invention, when the arc-resistant inorganic powder is aluminum oxide powder, it is excellent in arc resistance and electric insulation, and also acts as a curing agent. When it is zircon powder or cordierite powder, it has excellent arc resistance and low thermal expansion, and has the effect of improving the thermal shock resistance exhibited by the plate-shaped arc-extinguishing material (I) obtained. It also has the advantage that the raw material cost is low.

The plate-shaped arc-extinguishing material (I) of the present invention is obtained by drying a sheet-like material composed of the strength-developing inorganic sheet and the inorganic binder composition (A) at 80 to 120 ° C., followed by pressure molding. Since it is produced by curing at 120 to 200 ° C. to remove water and curing, and then cooling to 80 ° C. or lower, the excellent plate-shaped arc-quenching material (I) can be easily obtained.

In the above-mentioned production method of the present invention, the sheet-shaped material before pressure molding is the insulating property imparting gas generating compound 30 to
45%, arc-resistant inorganic powder 0 to 28%, and curing agent 2 to 10% of primary metal phosphate aqueous solution are mixed, and then primary metal phosphate aqueous solution 40 to 65% are added and kneaded. An inorganic binder composition (I) is prepared, and a strength-developing inorganic sheet is immersed in the inorganic binder composition (I) to prepare a sheet-like product having the inorganic binder composition (I) attached thereto, followed by drying at 80 to 120 ° C. Since the concentration of the aqueous solution of the primary metal phosphate in the sheet-like material is adjusted to 65 to 85%, the inorganic binder composition (I) has the strength-developing inorganic sheet when pressure-molded. It is possible to obtain a plate-shaped arc-extinguishing material (I) that is dense and has good mechanical strength and the like by integrating with a strength-developing inorganic sheet without protruding.

In the above-mentioned production method of the present invention, the insulating property-providing gas generating source compound is aluminum hydroxide, the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, and the primary phosphate metal salt is used. The curing agent of the aqueous solution is wollastonite crystals or aluminum hydroxide, and the aqueous solution of the primary metal phosphate has a concentration of the primary aluminum phosphate or the primary magnesium phosphate of 25.
When it is a 55% aqueous solution, it has excellent arc resistance, heat resistance, and thermal shock resistance, and has a good effect of preventing a decrease in electric resistance.

In the above-mentioned production method of the present invention, the sheet material before pressure molding is the insulating property imparting gas generating compound 30 to
50% and arc resistant inorganic powder 0 to 20% are mixed, and then 50 to 70 condensed alkali metal phosphate aqueous solution is added.
% To add and knead to prepare an inorganic binder composition (II), which is then immersed with a strength-developing inorganic sheet to prepare a sheet-shaped article having the inorganic binder composition (II) attached thereto. In the case where the concentration of the aqueous solution of the first metal phosphate in the sheet is adjusted to 65 to 85% by drying at 80 to 120 ° C., the inorganic binder composition (I) described above is used.
It has an effect that the effect of preventing lowering of the electric resistance is greater than that of using.

In the above-mentioned production method of the present invention, the insulating property-providing gas generating compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, and the arc resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, When the condensed alkali metal phosphate aqueous solution is an aqueous solution of sodium metaphosphate or potassium metaphosphate having a concentration of 10 to 40%, it has an effect of particularly great reduction in electric resistance.

In the above-mentioned production method of the present invention, the inorganic binder composition (I) or the inorganic binder composition (I) in the form of a sheet obtained by adhering the inorganic binder composition (I) or the inorganic binder composition (II) to the strength developing inorganic sheet. Inorganic binder composition (I
When the adhesion amount of I) is 200 to 350 parts with respect to 100 parts of the strength-developing inorganic sheet, it has an effect of excellent heat resistance, arc resistance, and thermal shock resistance.

In the above-mentioned production method of the present invention, when pressure molding is carried out when two or more sheet-like materials dried at 80 to 120 ° C. are stacked and molded, the size (thickness) can be easily controlled. In addition, the mechanical strength is improved as compared with the case of one sheet.

In the above-mentioned production method of the present invention, an insulating property-providing gas generating compound is further sprinkled on one or both sides of the strength-developing inorganic sheet containing the inorganic binder composition (A) during pressure molding. In this case, it has the effect of further increasing the effect of preventing a decrease in electric resistance.

In the above-mentioned production method of the present invention, when the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, the electric resistance is further reduced as compared with the case where aluminum hydroxide is used. It has the effect of increasing the prevention effect.

In the above-mentioned production method of the present invention, a sheet-like material to be laminated is prepared by using the inorganic binder composition (I) according to claim 3 and dried at 80 to 120 ° C. to form a metal monophosphate salt. A sheet material prepared by using the inorganic binder composition (II) according to claim 8 on one or both sides of a sheet material adjusted to have an aqueous solution concentration of 65 to 85% is dried at 80 to 120 ° C. Then, the concentration of the condensed alkali metal phosphate aqueous solution in the sheet-like material is adjusted to 65 to 85%, and then the sheets are stacked, and the stacked laminated materials are stacked according to the required thickness and pressed. Molded, 1
After curing at 20 to 200 ° C. to accelerate the removal of water and curing, and then cooling to 80 ° C. or lower, the electrical resistance is further lowered as compared with the case of using the inorganic binder composition (I) alone. It has the effect of great prevention.

In the above-mentioned production method of the present invention, as a dust-prevention treatment during punching of the plate-shaped arc-extinguishing material (I), if a step of applying and impregnating a coating agent is further included, cutting or breaking during punching is performed. This has the effect that the fiber particles generated by this are less likely to be generated.

In the above-mentioned production method of the present invention, when the coating agent is an organic metal compound (metal alkoxide) or an organic resin, the coating agent and the plate-shaped arc-extinguishing material (I) as the base are used.
It has the effect that it has a good bondability with and has a great dust-preventing property.

The plate-shaped arc-extinguishing material (II) of the present invention comprises an insulating property-providing gas source compound 40 to 55%, an arc resistant inorganic powder 25 to 40%, a primary phosphoric acid metal salt 8 to 18% and Hardening agent of metal monophosphate 5-10%, water 2.6-12
% And strength-developing inorganic fiber 2-10% Inorganic binder composition (C) is a plate-shaped arc-extinguishing material (II) formed by pressure molding and curing, and therefore has excellent arc resistance and heat resistance. Have an effect.

In the plate-shaped arc-extinguishing material (II) of the present invention,
Insulation-providing gas source compound is magnesium hydroxide,
In the case of aluminum hydroxide, magnesium carbonate or calcium carbonate, the aforementioned inorganic binder composition (I
Similar to the plate-shaped arc-extinguishing material (I) produced by using I), it has an effect of large reduction in electric resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the arc resistant inorganic powder is zircon powder, cordierite powder or mullite powder, it has an effect of being excellent in arc resistance and thermal shock resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the monobasic metal phosphate is monobasic aluminum phosphate, monobasic magnesium phosphate or monobasic sodium phosphate, the insulation-providing gas source compound also acts as a curing agent, and a good inorganic bond It has the effect of becoming an agent.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the amount of water added to the primary metal phosphate is such that the concentration of the aqueous primary metal salt solution is 60 to 75%, plasticity occurs during pressure molding, resulting in dense molding. It has the effect of gaining a body.

In the plate-shaped arc-extinguishing material (II) of the present invention,
The primary metal phosphate hardener is wollastonite crystals,
200 ° C if it is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate
The effect of obtaining a molded article having water resistance by the heat treatment up to.

In the plate-shaped arc-quenching material (II) of the present invention,
When the strength-expressing inorganic fiber is an inorganic short fiber, it has an effect of being excellent in heat resistance and being uniformly dispersed.

In the plate-shaped arc-extinguishing material (II) of the present invention,
When the inorganic short fiber is a natural mineral fiber, a ceramic fiber or a ceramic whisker, it has an effect of further being excellent in mechanical strength and arc resistance.

In the plate-shaped arc-extinguishing material (II) of the present invention,
If the natural mineral fibers are wollastonite crystals that also act as a hardening agent for the primary metal phosphate, the unreacted fiber component improves the mechanical strength (bonding strength) and the reaction component improves water resistance. It has the effect of being imparted.

The plate-shaped arc-extinguishing material (II) of the present invention comprises an insulating property-providing gas source compound 40 to 55%, an arc resistant inorganic powder 25 to 40%, a primary phosphoric acid metal salt 8 to 18% and a Hardening agent of metal monophosphate 5-10%, water 2.6-12
% And the strength-expressing inorganic fiber 2 to 10%, the inorganic binder composition (C) is pressure-molded in a mold and then 120
Since it is produced by curing at ~ 200 ° C, it is possible to obtain the final product such as an arc-extinguishing plate as it is without the need for external processing in many cases.

In the above-mentioned production method of the present invention, when the insulating property-providing gas generating compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate, it has an effect of great reduction of electric resistance. .

In the above-mentioned production method of the present invention, when the arc resistant inorganic powder is zircon powder, cordierite powder or mullite powder, it has an effect of being excellent in arc resistance and thermal shock resistance.

In the above-mentioned production method of the present invention, when the monobasic metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate, an inorganic binder composition having a strong binding force. (C) is obtained.

In the above production method of the present invention, when the hardener for the primary metal phosphate is wollastonite crystals, magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate, the water resistance is 200 ° C. Developed by heat treatment up to and mechanical strength (bond strength)
Also has the effect of improving.

In the switch of the present invention, the plate-shaped arc extinguishing material (I) or (II) according to any one of claims 1 to 13 or claim 26 to 34 is used as an arc extinguishing side plate. Since the arc-extinguishing chamber is a switch in which electrodes and contacts are arranged in the vicinity of the contacts, the breaking performance, durability performance, and insulation resistance improving performance are excellent.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of an arc extinguishing chamber manufactured using the plate-shaped arc extinguishing material of the present invention.

FIG. 2 is a side view showing a scribed partial cross section showing an embodiment of a switch according to the present invention.

FIG. 3 is a schematic perspective view showing an embodiment of a conventional arc extinguishing chamber.

FIG. 4 is a side view of a partially cut-away partial cross-section showing an embodiment of a switch of the prior art.

[Explanation of symbols]

2 Arc-extinguishing side plate made of the plate-shaped arc-extinguishing material of the present invention, 4 fixed contacts, 5 movable contacts, 6 switch.

Front page continuation (72) Inventor Hiroshi Adachi 1-1-1, Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Laboratory (72) Inventor Kenichi Nishina 1-8 Midoricho, Fukuyama-shi Fukuyama Manufacturing Co., Ltd. (72) Inventor Kazunori Fukuya 1-8 Midoricho, Fukuyama City Mitsubishi Electric Co., Ltd. Fukuyama Factory (72) Inventor Shinji Yamagata 1-8 Midoricho, Fukuyama City Mitsubishi Electric Co., Ltd. Fukuyama Factory (72) Inventor Shunichi Katsube 1-8 Midoricho, Fukuyama-shi Fukuyama Works, Mitsubishi Electric Corporation

Claims (40)

[Claims] 1. A strength-developing inorganic sheet 35 having a composition after curing, which is obtained by press-molding and curing a sheet-shaped material comprising the strength-developing inorganic sheet and the inorganic binder composition (A).
˜50% by weight and inorganic binder composition (B) 50-6
5% by weight of a plate-shaped arc-extinguishing material (I). 2. The plate-shaped arc-extinguishing material (I) according to claim 1, wherein the strength-developing inorganic sheet is a glass mat, a glass cloth, or a ceramic paper made from a ceramic fiber, which is made of insulating glass fiber. . 3. The inorganic binder composition (A) comprises an insulating property-providing gas source compound 30 to 45% by weight, an arc resistant inorganic powder 0 to 28% by weight, and a primary metal phosphate aqueous solution 40 to 40% by weight.
65% by weight and a curing agent for an aqueous solution of a primary metal phosphate 2 to 2
The plate-shaped arc-quenching material (I) according to claim 1, which is an inorganic binder composition (I) consisting of 10% by weight. 4. The plate-shaped arc-extinguishing material (I) according to claim 3, wherein the insulation-providing gas generating source compound is aluminum hydroxide. 5. The plate-shaped arc-extinguishing material (I) according to claim 3, wherein the primary metal phosphate is aluminum monophosphate or magnesium monophosphate. 6. The concentration of the primary metal phosphate aqueous solution is 25 to
The plate-shaped arc-extinguishing material (I) according to claim 3, which is 55% by weight. 7. The plate-shaped arc-extinguishing material (I) according to claim 3, wherein the curing agent for the aqueous solution of the primary metal phosphate is wollastonite crystals or aluminum hydroxide. 8. The inorganic binder composition (A) comprises 30 to 50% by weight of an insulation-providing gas generating source compound, 0 to 20% by weight of arc resistant inorganic powder, and 50 to 70% by weight of an aqueous solution of condensed alkali metal phosphate. % Of the inorganic binder composition (II). 9. The plate-shaped arc-extinguishing material (I) according to claim 8, wherein the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate. 10. The plate-shaped arc-extinguishing material (I) according to claim 8, wherein the condensed alkali metal phosphate is sodium metaphosphate or potassium metaphosphate. 11. An aqueous solution of an alkali metal salt of condensed phosphoric acid,
The plate-shaped arc-extinguishing material (I) according to claim 8, having a concentration of 10 to 40% by weight. 12. The plate-shaped arc-extinguishing material (I) according to claim 8 or 9, wherein the insulating property-providing gas generating source compound also acts as a curing agent for the condensed alkali metal phosphate aqueous solution. 13. The plate-shaped arc-extinguishing material (I) according to claim 3 or 8, wherein the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder. 14. A sheet-shaped material comprising the strength-developing inorganic sheet and the inorganic binder composition (A),
An inorganic sheet for strength development and an inorganic binder composition, characterized by being dried at 0 ° C., pressure-molded, cured at 120 to 200 ° C. to remove water and cured, and then cooled to 80 ° C. or less. A method for producing a plate-shaped arc-extinguishing material (I), wherein the composition of (A) after curing is 35 to 50% by weight of an inorganic sheet for strength development and 50 to 65% by weight of an inorganic binder composition (B). 15. A sheet-form material before pressure-molding is a curing agent for an insulating property-providing gas source compound 30 to 45% by weight, an arc resistant inorganic powder 0 to 28% by weight, and a primary metal phosphate aqueous solution. 2 to 10% by weight are mixed, and then 40 to 65% by weight of a primary metal phosphate aqueous solution is added and kneaded to prepare an inorganic binder composition (I), and an inorganic sheet for strength development is dipped therein. Then, a sheet-like material to which the inorganic binder composition (I) is attached is produced, and then dried at 80 to 120 ° C. to adjust the concentration of the aqueous solution of the primary metal phosphate in the sheet-like material to 65 to 85% by weight. The method according to claim 14, which is adjusted to%. 16. The insulation-providing gas generating source compound is aluminum hydroxide, the arc-resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder, and the curing agent for the aqueous solution of a primary metal phosphate is The method according to claim 15, wherein the method is wollastonite crystals or aluminum hydroxide, and the aqueous solution of a primary metal phosphate is an aqueous solution of primary aluminum phosphate or primary magnesium phosphate having a concentration of 25 to 55% by weight. 17. A sheet material before pressure molding is mixed with 30 to 50% by weight of an insulation-providing gas generating source compound and 0 to 20% by weight of arc resistant inorganic powder, and then condensed alkali metal phosphate. A sheet form in which 50 to 70% by weight of an aqueous salt solution is added and kneaded to prepare an inorganic binder composition (II), and an inorganic sheet for strength development is immersed in the inorganic binder composition (II) to adhere the inorganic binder composition (II). After making things, 80
15. The method according to claim 14, wherein the concentration of the condensed alkali metal phosphate aqueous solution in the sheet is adjusted to 65 to 85% by drying at -120 ° C. 18. The insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate, and the arc resistant inorganic powder is aluminum oxide powder, zircon powder or cordierite powder,
18. The method according to claim 17, wherein the condensed alkali metal salt aqueous solution is an aqueous solution of sodium metaphosphate or potassium metaphosphate having a concentration of 10 to 40% by weight. 19. The inorganic binder composition (I) in a sheet-like product obtained by adhering the inorganic binder composition (I) or the inorganic binder composition (II) to a strength-developing inorganic sheet.
Alternatively, the amount of the inorganic binder composition (II) attached is 200 to 350 with respect to 100 parts by weight of the strength developing inorganic sheet.
18. The method according to claim 14, 15 or 17, which is parts by weight. 20. The manufacturing method according to claim 14, wherein two or more sheet-like materials dried at 80 to 120 ° C. are superposed upon each other when pressure-molding. 21. The pressure-injecting compound, wherein an insulating property-providing gas generating compound is further sprinkled on one or both sides of the strength-developing inorganic sheet containing the inorganic binder composition (A). The manufacturing method described. 22. The method according to claim 21, wherein the insulation-providing gas generating source compound is magnesium hydroxide, magnesium carbonate or calcium carbonate. 23. The sheet-like material to be laminated is claim 3
Prepared using the described inorganic binder composition (I), 80
The inorganic binder composition (II) according to claim 8 is dried on one side or both sides of a sheet-shaped material which is dried at 120 ° C to 120 ° C to adjust the concentration of the aqueous solution of a primary metal phosphate to be 65 to 85% by weight. 80-120 ℃ the sheet material prepared using
After adjusting the concentration of the condensed alkali metal phosphate aqueous solution in the sheet-like material to 65 to 85% by weight, the sheets are laminated and the laminated materials are laminated in accordance with the required thickness. After pressure molding, curing at 120-200 ℃ to accelerate the removal of moisture and curing, then at 80 ℃
The method according to claim 20, wherein the method is cooled below. 24. The method according to claim 14, further comprising a step of applying and impregnating a coating agent as a dust generation preventing treatment at the time of punching the plate-shaped arc extinguishing material (I). 25. The method according to claim 24, wherein the coating agent is an organic metal compound (metal alkoxide) or an organic resin. 26. Insulation-providing gas source compound 40 to 5
5% by weight, arc resistant inorganic powder 25-40% by weight, primary phosphate metal salt 8-18% by weight and primary phosphate metal salt curing agent 5-10% by weight, water 2.6-12% by weight And a plate-shaped arc-extinguishing material (II) obtained by pressure molding and curing an inorganic binder composition (C) consisting of 2 to 10% by weight of strength-expressing inorganic fiber. 27. The plate-shaped arc-extinguishing material (II) according to claim 26, wherein the insulating property-providing gas source compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate. 28. The plate-shaped arc-extinguishing material (II) according to claim 26, wherein the arc-resistant inorganic powder is zircon powder, cordierite powder or mullite powder. 29. The plate-shaped arc-extinguishing material according to claim 26, wherein the monobasic metal phosphate is aluminum monophosphate, magnesium monophosphate or sodium monophosphate.
I). 30. The amount of water added to the primary metal phosphate is 60 when the concentration of the aqueous primary metal salt solution is 60.
An amount of about 75 to 75% by weight.
8. A plate-shaped arc extinguishing material (II) according to item 8. 31. The plate-shaped arc-extinguishing material (II) according to claim 26, wherein the curing agent for the primary metal phosphate is wollastonite crystals, magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate. 32. The plate-shaped arc-extinguishing material (II) according to claim 26, wherein the strength-expressing inorganic fiber is an inorganic short fiber. 33. The plate-shaped arc-extinguishing material (II) according to claim 32, wherein the inorganic short fibers are natural mineral fibers, ceramic fibers or ceramic whiskers. 34. The plate-shaped arc-extinguishing material (II) according to claim 33, wherein the natural mineral fibers are wollastonite crystals that also act as a hardening agent for the primary metal phosphate. 35. Insulation-providing gas generating compound 40 to 5
5% by weight, arc resistant inorganic powder 25-40% by weight, primary phosphate metal salt 8-18% by weight and primary phosphate metal salt curing agent 5-10% by weight, water 2.6-12% by weight And 120 to 2 after the inorganic binder composition (C) consisting of 2 to 10% by weight of the strength-developing inorganic fiber is pressure-molded in a mold.
A plate-shaped arc-extinguishing material characterized by being cured at 00 ° C (I
Method I). 36. The method according to claim 35, wherein the insulation-providing gas generating source compound is magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate. 37. The method according to claim 35, wherein the arc-resistant inorganic powder is zircon powder, cordierite powder or mullite powder. 38. The method according to claim 35, wherein the monobasic metal phosphate is monobasic aluminum phosphate, monobasic magnesium phosphate or monobasic sodium phosphate. 39. The method according to claim 35, wherein the curing agent for the primary metal phosphate is wollastonite crystals or magnesium hydroxide, aluminum hydroxide, magnesium carbonate or calcium carbonate. 40. Claims 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 26, 27, 28,
A switch in which an arc-extinguishing chamber using the plate-shaped arc-extinguishing material as described in 29, 30, 31, 32, 33 or 34 is arranged near electrodes and contacts.