JPS58161208A - Colored refractory electric insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel brightly colored heat resistant electrical insulator.

Conventionally, it has been manufactured by bonding e-edge base materials such as heat-resistant gas insulating material, mica, asbestos/T, etc. with a sludge agent such as low-melting-point crow. Among these, the so-called ``Micalex'', which is made by bonding mica powder with a boric acid-lead glass with a low melting point, is widely known. This Micalex has excellent heat resistance and electrical insulation, but during manufacturing, it has a softening temperature of 500 to 8 (1
) It is necessary to apply a pressure of about 200 to 100 OKvd while heating at 0 °C, and the process is extremely complicated, so there is a drawback that the manufacturing cost is high. At the end of the bud, a reaction progresses between the mica and the glass during binding, and the mica attaches to the glass.
However, when the workability decreases, there are also drawbacks.

What about the insulating base material? As f@adhesives, low melting point glass If, phosphoric acid, phosphates such as metal monophosphorous 112 salts, sols such as alumina sol and silica sol, and t-ment are used. However, phosphoric acid binders such as phosphoric acid or phosphates have heat resistance (40
0-500℃ pipe) and nonflammability, but it has poor water resistance and electrical properties when wet, and also has a chemical reaction between the insulating base material and the phosphoric acid-based adhesive, which leads to the formation of condensation. There were disadvantages in that the adhesion effect was reduced and it was difficult to obtain uniform molded products. In addition, a phosphoric acid binder mixed with an organic binder made of thermosetting or garden resin is sometimes used as a binder; decomposition may occur, making molding difficult.

On the other hand, sol thread binders such as alumina sol and silica sol require high-temperature treatment at about 1000 to 1200° C. for binding, and have the same drawbacks as Micalex. In addition, since it can be used in combination with a thermosetting resin binder, it has the disadvantage that it is difficult to obtain a dense molded product.

In order to solve these drawbacks, an insulating substrate made of inorganic fibers such as chrysotile asbestos and an inorganic optical filler was added, and an adhesive made of boric acid, zinc oxide, and/or calcium oxide was added. A method for producing heat-resistant electrical insulators has been proposed in which heat-pressing molding is carried out using an eddy current at 130 to 200° C. and a pressure of 100 to 300 K9/i. However, the ti produced by this method
However, it has been desired to improve the arc resistance of the low-temperature insulators, which are not completely satisfactory in terms of arc resistance and the like. - In addition, in this way, the electric insulators are white due to the raw materials used in their manufacture, and if it is desired to color the electric insulators, expensive inorganic pigments must be used. However, coloring of electrical insulators with inorganic pigments has problems in terms of heat resistance and uniform dispersibility of the inorganic pigments.
Since the above-mentioned electric insulator is white, components such as a thermosetting resin contained therein may change color into brown threads when heated, which has the drawback of reducing its commercial value.

The present invention aims to solve these drawbacks, and by using a solid solution of zinc oxide, magnesium oxide, and nickel oxide, and boric acid as a binder for the insulating base material, the P-edge base material can be bonded. When bonding, there is no need for high temperature and high pressure, and there is no damage to the insulating base material.
Excellent heat resistance, acid silver insulation, mechanical compulsion, and arc resistance.
The object of the present invention is to provide an electrical insulator that can be vividly colored and prevent a decrease in commercial value due to discoloration.

That is, the present invention provides a colored material in which an inorganic PR base material is bound with a binder made of a solid solution of curved lead oxide, magnesium oxide, and nickel oxide, boric acid, and optionally a thermosetting resin. N1PR provides thermal vehicle insulation.

Insulating substrates used in the present invention include cloths, mats, etc. made of glass fiber, mica, asbestos, Yaramic, etc.
Penozoichi powder and boiled fiber are used, and these can be used alone or in combination as a laminate. #→ Optical filler may be added to the inorganic insulating base material as an inorganic optical filler.
Zinc oxide, titanium oxide, calcium oxide, tin oxide, magnesium oxide, aluminum oxide, hardened silicon, iron oxide, zirconium oxide, calcium hydroxide, aluminum hydroxide, iron hydroxide, aluminum fluoride, magnesium fluoride , boron nitride, glass powder, zirconium silicate,
sword on, fired ray, norium titanate, talc,
Examples include mica, mullite, zircon sand, 7 ras no runes, vermiculite, nosorite, etc.

A solid solution of zinc oxide, magnesium oxide, and nickel oxide and boric acid are used as the binder for causing blue discoloration on the insulating base material as described above. Further, if necessary, a heat-resistant thermosetting resin can be added as an organic binder to the solid solution of zinc oxide, magnesium oxide, and nickel oxide and boric acid to form a binder. By adding the thermosetting resin, the pat gap of the insulating base material is filled with light, which makes the binding of the insulating base material stronger, and the mechanical strength t(, m; It is also possible to improve water resistance.

A solid solution with zinc oxide, magnesium oxide and nickel oxide will be explained.

This solid solution has a rock salt-type structure and a wurtzite-type structure, and the region in which the former forms is quite wide, while the latter is very narrow.

In the color scheme, the rock salt type (Nt, Mg) O-based solid solution is mostly yellow-green, and when Zn2+ is added to it, it becomes somewhat brown. NI2+ is dissolved in a very small amount in the tsurutsuite type (Nl, zn) o-based solid solution, but this small amount of Nt2+ (NiO
With J5mo1%), a slightly brownish and deep yellow-green color tone is obtained due to 4-coordinated Ni''.

In addition to zinc oxide powder, zinc oxide sources for producing the solid solution include, for example, zinc hydroxide, zinc carbonate, basic zinc carbonate, zinc nitrate, zinc acetate, and the like. In addition to magnesium hydroxide powder, examples of the magnesium oxide source include magnesium oxide, magnesium carbonate, basic magnesium carbonate, magnesium nitrate, and magnesium acetate. In addition to nickel oxide powder, examples of nickel oxide include nickel hydroxide, nickel carbonate, basic nickel carbonate, nickel nitrate, and nickel sulfate.

The zinc oxide-magnesium oxide-nickel oxide solid solution is
Specifically, it is prepared by mixing high-purity zinc oxide powder, magnesium oxide powder, and nickel oxide powder in the desired proportions, and then heating this mixture to a temperature of 1000 to 1500°C. .

When producing a zinc oxide-magnesium oxide-plated nickel solid solution, the mixing ratio of the raw materials zinc oxide, magnesium oxide, and nickel oxide can be varied over a wide range depending on the purpose and color of the electrical insulator to be obtained. can.

In the present invention, heat-resistant thermosetting resins used as organic binders include, for example, phenolic resins,
Examples include epoxy/resin, silicone resin, polyimide resin, melamine resin, and ester resin, and these thermosetting resins may be used alone or in combination.

In the present invention, as the insulating base material, a solid solution of zinc oxide, magnesium monide and nickel oxide, and boric acid,
A mixture of thermosetting resins may be used in some cases, but the molar ratio of boric acid to the solid solution is preferably from 0.5 to 8.0. In the present invention, the molar ratio of boric acid and the zinc oxide-magnesium oxide-nickel oxide solid solution is used in the following sense. That is, K, for example, magnetohydroxide 7
When aluminum is used as a source of magnesium oxide, zinc oxide is used as a source of curved lead oxide, and nickel oxide is used as a source of nickel oxide, water is dissipated by magnesium hydroxide/lambage and heating, whereas zinc oxide And nickel oxide exists with a moderate molecular weight to form a solid solution. Here, magnesium hydroxide 5.9. Considering the case where fW zinc oxide (-10 g and 5 g of nickel oxide are used as raw materials, there is sediment in the solid solution and 5 g in magnesium oxide (9)
There is 3.46g of magnesium oxide molecule (4(1, ψ))/magnesium hydroxide molecule (58, 12 > = 3.46g, and for convenience, it is 0.086 mol. exists in the solid solution, so if we convert this to the number of moles for convenience, it becomes 1,106 moles.-Nickel peroxide is 0.067 moles.Therefore, magnesium hydroxide 5g, zinc oxide j, lQ
, lit and a solid solution produced by heating 5 g of nickel oxide, 0.086+1.106+0.06
For convenience, it can be considered that 7 = 1.259 moles. On the other hand, since it can be considered that 1 mole of boric acid is 61.8F, it is possible to mix boric acid and solid solution at a desired molar ratio based on the above concept.

Preferably less than 7 liters of meth when used in a disinfectant mixture.
It is desirable to use L,<Fj below 200 meters.

In the heat-resistant electrical insulator according to the present invention, the insulator 1
00 heavy fracture part, the inorganic insulating base material is 5 to 90 parts by weight, preferably 4) to 75 parts by weight, and the inorganic adhesive consisting of a solid solution of zinc oxide, magnesium oxide, and nickel oxide, and boric acid is The organic binder is 5 to 80 parts heavy, preferably 60 parts heavy, and the organic binder is made of a thermosetting resin.
The phantom part is preferably about 2 to about 2 parts, and the inorganic optical filler is about 0 to 70 parts.
The number of copies is conveniently between 5 and 50.

If the P green base material is less than 5 layers, the mechanical force ejection of the resulting electric insulator will be reduced, while if it is 90 layers or more, 1 part or more,
This is not a good idea since the mechanical strength of the Go player decreases as the result of light increases. In particular, if the amount of the inorganic binder is less than 5 parts by weight, the heat resistance of the resulting electrical insulator will decrease, while if it is more than 80 parts by weight, the mechanical strength will decrease, which is not preferable. In addition, an electrical insulator with satisfactory properties can be obtained even without adding an organic binder, but when 2 parts by weight or more of an organic binder is included, the resulting electrical insulator has poor water resistance and mechanical strength. On the other hand, if the content exceeds 204 parts, heat resistance decreases, which is not preferable.

The method for manufacturing a heat-resistant electrical insulator according to the present invention will be described below.
I will clarify.

First, by mixing high-purity zinc monoxide, high-purity magnesium hydroxide powder, and high-purity nickel oxide in the desired distribution, and then heating to a temperature of 1000 to 1500 ° C.
Produce a zinc oxide-magnesium oxide-nickel oxide solid solution in-house. This solid solution is mixed with boric acid, and a thermosetting resin is molded into the shell according to the decoration, and these mixed pots are made into a fufu!
A heat-resistant electrical insulator is produced by uniformly dispersing the mixture onto a loquat base material and then applying pressure while heating it.

The binder components of zinc oxide-magnesium oxide-nickel oxide solid solution, boric acid, and thermosetting resin are mixed with light before being sprinkled onto the insulating substrate, and further made into 100 meshes or less using a ball mill or the like.

The insulating base vr on which the binder has been sprinkled is placed in a mold, and 1
A heat-resistant electrical insulator is obtained by heating at a molding temperature of 30-200° C. and a molding pressure of 100-300° C. for about lθ-60 minutes.

Regarding the molding temperature, if it is below 130°C, the fluidity of the inorganic binder will not be good and the strength of the resulting insulator will decrease, which is undesirable1.If it is above 200°C, boric acid will rapidly deteriorate. This is undesirable because it causes dehydration and causes foaming.

The molding pressure is 100Kv'cr/(less than 100Kv'cr/(less than 100Kv'cr/), which is not preferable because a dense insulator cannot be obtained;
There is no change in the properties of the obtained insulator even if mff is greater than 1, and there is no particular effect of applying high voltage.

The molding time varies depending on the molding temperature and molding pressure, but is approximately 1 to ω minutes.

In this way, an electrical insulator is obtained and, depending on the pressure, the purpose of use and the conditions of use, in order to obtain dimensional stability, it is possible to obtain an electrical insulator at a temperature higher than the temperature of the compaction forming process, either under pressure or under no pressure. So, it is desirable to bury it afterwards.

The present invention will be explained below with reference to examples, but the present invention is not limited to the following examples.

Example 1 Zinc oxide (ZnO), magnesium oxide (MgO), and nickel oxide (NiO), molar cent ratio,
After mixing in a ratio of 0.9870.01:0.01 and pre-drying at 100°C, this was heated in an electric furnace.
It was fired at 1200° C. for 2 hours to prepare a solid solution of zinc oxide, magnesium oxide, and nickel oxide. This solid solution had a bright light green color. Next, this solid solution and boric acid (H3BOa) were mixed at a molar ratio of 1:30 to form an inorganic binder. In 100 parts of electrical insulator, insulating base material 5
1.1 parts by weight, 40.9 parts by weight of the inorganic binder, and 8 mt parts of the mixture of epoxy resin and silicone resin were used. Of these, the inorganic binder and organic resin are mixed in advance,
Then, it was pulverized in a sol mill and used to a size of 100 mesh or less.

As an insulating substrate, glass chopped strand pine) k
A total of 10 mats cut into 150 x 150 it sizes were prepared, and each mat was sprinkled with the binder prepared as described above, and two glass cloth mats were layered one above the other. This was placed in a mold, set at a temperature of 170° C., and heated under pressure at a pressure of 200 kg/cIIL2 for a period of time to produce an electrical insulator having a bright light green color.

Example 2 Zinc oxide, magnesium oxide, and nickel oxide in a molar percentage ratio of 0.90: 0.05: 0.05
After wet mixing at a ratio of 100° C. and pre-drying at 100° C., this was calcined at 1200° C. for 2 hours to prepare a solid solution of zinc oxide, magnesium oxide and nickel oxide.

This solid solution had a bright green color. Next, using this solid solution, an electric insulator having a soft green color was manufactured in the same manner as in Example 1.

Example 3 Zinc oxide, magnesium oxide, and nickel oxide in a molar percentage ratio of 0.80: 0.10: 0.10
A solid solution of zinc oxide, magnesium oxide, and nickel oxide was prepared by mixing at a ratio of 1,200° C. and firing at 1,200° C. for 2 hours. This solid solution had a bright dark green color. Next, using this solid solution, an electrical insulator having a bright dark green color was produced in the same manner as in Example 1.

Example 4 An electrical insulator having a bright light green color was produced in the same manner as in Example 1 except that epoxy resin and silicone resin were not used as the organic binder.

Example 5 Zinc oxide, magnesium oxide and nickel oxide were mixed in a molar ratio of 0.98:0.01:0.
After wet mixing at a ratio of 0.01 and pre-drying at 100°C,
and '1 were fired at 1200℃ for 2 hours to form zinc oxide,
A solid solution of magnesium oxide and nickel oxide was prepared. This solid solution had a bright light green color.

Next, this solid solution and 6111I acid were mixed at a molar ratio of 1=30 to form an inorganic binder. This inorganic binder and white synthetic mica powder (60 mesh or less) are mixed in a weight ratio of 40:
After mixing thoroughly with a crusher at a ratio of 60%, put into a mold with a size of 150 x 1501112,
170°C, pressurized for 1 minute at a pressure of 9/c1n2 to 200,
Upon heating, an electrical insulator with a bright light green color was produced.

Example 6 After preparing an inorganic binder in the same manner as in Example 5, the inorganic binder and white synthetic mica powder (60 mesh or less) were mixed.
After mixing in a weight ratio of 40:60, epoxy resin was further added in an amount of 51% of the total weight, and the mixture was thoroughly mixed using a tree crusher.

Is the following operation the same as in Example 5? An electrical insulator with a bright #green color was produced.

The physical property values of each drowsiness insulator obtained in this way are J
Measurements were made according to IS K 6911 General Test Methods for Thermosetting Plastics, and the results are shown in Table 1.

However, regarding the volume resistance and surface resistance when humid, electrical insulators are subject to humidity! Measurement was performed after leaving the sample in a J6.5% room for U hours.

From Table 1, it can be seen that by using an inorganic binder consisting of a solid solution of zinc oxide and magnesium oxide and boric acid as a binder for the insulating base material, and adding a thermosetting resin if necessary, heat resistance and electrical properties can be improved. It can be seen that an electrical insulator with excellent insulation properties, mechanical strength, arc resistance, and bright colors can be obtained without requiring extremely high temperature and pressure.

Applicant's agent Kiyoshi Inomata

Claims (1)

[Scope of Claims] 1. A heat-resistant magnetic insulator with a uniform layer color, which is formed by bonding an inorganic insulating base material with a W5 adhesive consisting of a solid solution of zinc oxide, magnesium oxide, and nickel oxide, and boric acid. 2. A colored heat-resistant electrical insulator made by bonding an inorganic insulating base material with an oxidized push button, a solid solution of magnesium oxide and nickel oxide, boric acid, and an M adhesive consisting of a thermosetting resin.