WO2000042107A1

WO2000042107A1 - Switch

Info

Publication number: WO2000042107A1
Application number: PCT/JP1999/000121
Authority: WO
Inventors: Shunichi Katsube; Kazunori Fukuya
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1999-01-18
Filing date: 1999-01-18
Publication date: 2000-07-20
Also published as: EP1083203A1; CN1158353C; CN1293699A; KR20010106098A

Abstract

A switch containing as a housing an insulating molded structure made of an organic/inorganic composition comprising 35 to 50 wt.% nylon 6 or nylon 6 alloy, 15 to 25 wt.% reinforcement, and 30 to 40 wt.% magnesium hydroxide. The composition may comprise 35 to 45 wt.% nylon 6 or nylon 6 alloy, 15 to 25 wt.% reinforcement, 30 to 40 wt.% magnesium hydroxide, and 5 to 15 wt.% inorganic substance. The inorganic substance may be calcined clay or wollastonite. The molded structure as a component of the switch is reduced in dimensional change and has improved rigidity and creep resistance. It is reduced in strain, has a satisfactory surface gloss, and is less apt to be marred.

Description

Description Switchgear Technical field

The present invention relates to a switch part of which is constituted by a molded article of an insulating component. More specifically, the molded product has high rigidity and high strength, maintains insulation after switching off the switch, provides flame retardancy, has little distortion of the molded product, has good surface gloss, and has scratches. For things that are difficult to attach. Background art

Conventionally, for example, Japanese Patent Application Laid-Open No. Hei 8-117487 discloses that 45% to 80% by weight of nylon 6, 15% to 50% by weight of magnesium hydroxide, and 5% to 40% by weight of glass fiber. A switch using a molded article containing the composition by weight is described. A switch using a molded article containing the above composition provides the required stiffness, strength, required creep, insulation after switching off the switch, flame retardancy, etc. The problem is that the production failure rate increases, and the rigidity of the obtained molded product decreases (however, the required rigidity is satisfied even after the decrease). The problem that it is difficult to further reduce the size and thickness of the molded product, And the problem that the creep property of the obtained molded article is reduced (however, the creep property required above is satisfied even after the reduction). This dimensional change, decrease in rigidity, and decrease in creep property are presumed to be mainly attributable to the fact that Nylon 6 is a hygroscopic resin and has absorbed moisture and the like from the air or outside air after molding. .

By the way, it is known that the molded product immediately after molding absorbs moisture in the atmosphere and changes its dimensions.The rate of change of this dimensional change depends on the storage condition of the molded product, external factors such as season, etc. Different. Also, when assembling and manufacturing switches The molded product used for the molding is performed at a place separated from the molding of the molded product and the assembling of the switch, and is usually used for assembly several hours to several weeks after the molding to improve work efficiency. Therefore, if the external dimensions of the molded product change significantly within a short period of several hours to several weeks after molding, especially if it changes outside the allowable dimensions, the molded product can be used as a part for assembly. This will affect the production failure rate due to the switch assembly efficiency.

The present invention has been made in order to solve the above-mentioned problems, and has a specific ratio of nylon 6 or nylon 6-based alloy, a reinforcing material, and magnesium hydroxide contained in an organic-inorganic composite composition. By using this method, switches with high insulation after shut-off, small dimensional changes after molding, and a low production defect rate can be used. In addition to providing insulation after switching off the switch and providing flame retardancy, the dimensional change after molding is small, the production failure rate is low, and the rigidity after molding is low. An object of the present invention is to provide a switch in which a part of a molded article of an insulating component that is high and has excellent creep resistance is formed.

In addition, the present invention specifically specifies nylon 6 or nylon 6-based alloy contained in the organic-inorganic composite composition, a reinforcing material, magnesium hydroxide, and an inorganic material having an effect of suppressing the orientation of the reinforcing material. By distributing in proportions, it is possible to obtain a molded product of an insulating component that has a smaller dimensional change after molding and a lower production failure rate, and has higher rigidity and superior creep resistance after molding. The purpose is to provide a partially constructed switch.

Still another object of the present invention is to provide a switch part of which is formed by a molded article of an insulating component which has a good surface gloss and is not easily damaged. Disclosure of the invention The switch according to the present invention comprises 35-50% by weight of nylon 6 or nylon 6 series alloy, 15-25% by weight of reinforcing material, and 30-40% by weight of water. Since a part of the molded product is composed of an organic-inorganic composite composition containing magnesium oxide, the insulating property after interruption is high, the dimensional change after molding is small, and the production failure rate is low.

In addition, Nylon 6 or Nylon 6 alloy is 45 to 50% by weight, reinforcing material is 20 to 25% by weight, and magnesium hydroxide is 30 to 35% by weight. Wide range of molding conditions, such as molten resin temperature and mold temperature, enables easy molding and less precipitation of reinforcing material and magnesium hydroxide on the surface.

Also, Nylon 6 or Nylon 6 alloy is 35 to 45% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight. The dimensional change after molding is smaller and the production defect rate is lower.

Also, Nylon 6 or Nylon 6 alloy is 35 to 40% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight. Very small dimensional change after molding and low production failure rate.

In addition, since the molded product is a housing, it is one of the largest components of the circuit breaker, and contributes effectively to the reduction of the defective production rate. Also, 35 to 45% by weight of nylon 6 or a nylon 6 series alloy, 15 to 25% by weight of a reinforcing material, 30 to 40% by weight of magnesium hydroxide, and 5 to 15% A part of the product is composed of a molded product of an organic-inorganic composite composition containing an inorganic material having a low orientation by weight, so that the insulation is high after interruption and the dimensional change after molding is small. Low defect rate.

In addition, since the inorganic substance is calcined clay and / or wollastonite, the molded article is hardly damaged.

Also, since the molded product is a housing, it is the largest component of the circuit breaker components. It is one of the most important components and contributes effectively to the reduction of the production failure rate. Furthermore, since the molded article is the base of the housing, the surface gloss and the surface are not easily scratched, and thus are preferable. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a base of a case of a circuit breaker according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a cover of a circuit breaker housing according to another embodiment of the present invention.

FIG. 3 is a front view of the cover shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

The molded article of the insulating component constituting a part of the switch according to the present embodiment is composed of 35 to 50% by weight of nylon 6 or nylon 6 series alloy, and 15 to 25% by weight of nylon. It can be obtained by injection molding an organic-inorganic composite composition containing a reinforcing material and 30 to 40% by weight of magnesium hydroxide into a mold. When molding a black molded article, for example, a black dye or a black pigment is added to the organic-inorganic composite composition.

Nylon 6 series alloys include Nylon 6 and Nylon 66, Nylon 6 and Acrylonitrile 'butadiene copolymer (ABS), Nylon 6 and modified polyphenylene oxide ( (Modified PPO), Nylon 6 and MXD 6, Nylon 6 and Nylon 66 and MXD 6, etc., all of which have a lower resin melting temperature during molding than magnesium hydroxide dehydration temperature . Therefore, when kneading the nylon 6 or nylon 6 alloy with magnesium hydroxide and when molding the material obtained by kneading, magnesium hydroxide is dehydrated. And almost no. This means that when the electrodes (not shown) of the circuit breaker are opened and closed, the free carbon generated from the organic composition and the organic-inorganic composite composition, etc., which make up the case and the inside of the circuit breaker, and the contacts and the inside Submersible metal generated from metal parts (electrodes, contacts, tripping mechanism, etc.) and scattered molten metal droplets are dehydrated at about 250 ° C or higher contained in the above molded product. This means that insulation can be efficiently formed by the insulation-imparting gas generated from the magnesium.

The reinforcement is one or more selected from the group consisting of glass fibers or ceramic fibers. As for the diameter of the glass fiber, it is preferable that the aspect ratio is 1 to 15 1 or more from the viewpoint of rigidity and strength.

Next, the dimensional change after molding depending on the blending ratio of the organic-inorganic composite composition will be described.

[Dimension change test after molding]

First, a test molded product will be described. FIG. 1 is a perspective view showing a base (90 mm width × 155 mm length × 40 mm height) of a circuit breaker housing. In FIG. 1, a indicates the external dimension in the width direction, and the allowable dimension is 89.5 to 90.0 mm.

After molding the molded article (width dimension a immediately after molding is 89.5 mm to 89.6 mm), a thermo-hygrostat kept at 30 ° C—90% humidity Hold for 240 hours. After taking out from the thermo-hygrostat, measure the external dimension a in the width direction. If the dimension a is within the allowable range, pass the test. If the dimension a is out of the allowable range, reject the test. In other words, if the dimensional difference (= dimension a—dimension a.) Is within a predetermined range (0 to 0.4 mm), the test passes, and the smaller the dimensional difference is, the better.

Comparative Example 1 has a composition comprising 70% by weight of nylon 6, 20% by weight of magnesium hydroxide, and 10% by weight of glass fiber as a reinforcing material. A molded product was used.

Table 1 shows the test results. In the table, X indicates unacceptable, ◎, ◎ indicates pass, and ◎ indicates that the dimensional difference Δa is very small, and that dimensional a belongs to the approximate center of the allowable dimension range. Means what is preferred.

table 1

As shown in Table 1, the dimension of the molded product of Comparative Example 1 was out of the allowable range.However, in samples 1 to 4, the dimension a was within the allowable range and the dimensions were good in the dimensional change after moisture absorption. The result was obtained.

Even if the molded article of Comparative Example 1 is used for assembling a switch immediately after molding, for example, it can be normally assembled, but as described above (see Background Art). However, it cannot be stored for a short period of several hours to several weeks after molding (240 hours for testing), which is not desirable in terms of productivity o

Of the above tests results, Nye B emissions 6 or Nai b greater the ratio of the emission 6 based Aroi becomes small is Ku, force ⁵ tends dimensional change after moisture absorption is Naru rather small, Nye B emissions 6 It was also found that when the content of nylon 6 series alloy was less than 35% by weight, the kneading of the reinforcing material and magnesium hydroxide tended to be difficult when kneading the materials. On the other hand, when Nylon 6 or Nylon 6-based alloy exceeds 50% by weight, the moisture absorption of the molded article comprising the organic-inorganic composite composition increases, and the dimensional change after molding tends to increase. It was found that the rigidity of the molded article tended to decrease, and the creep performance tended to decrease.

Therefore, it is preferable that Nylon 6 or Nylon 6 alloy is 35 to 50% by weight.

If the amount of the reinforcing material is less than 15% by weight, the strength of the molded article made of the organic-inorganic composite composition tends to decrease. Conversely, if the amount is 25% by weight or more, the orientation of the reinforcing material becomes large. In other words, it was found that the distortion of the molded article tended to increase. Therefore, ₀ have then preferred that reinforcement is 1 5 to 2 5% by weight

If the content of magnesium hydroxide is less than 30% by weight, insulation performance after interruption may be reduced. If the content is more than 40% by weight, brittleness, rigidity and mechanical strength are reduced. It turned out that there was a tendency. Therefore, the content of magnesium hydroxide is preferably 30 to 40% by weight.

In addition, when nylon 6 or nylon 6 alloy is 45 to 50% by weight, reinforcing material is 20 to 25% by weight, and magnesium hydroxide is 30 to 35% by weight, Preferably, in the case of samples 1 and 2, that is, 45 to 50% by weight of nylon 6 or nylon 6 series alloy, 20% by weight of reinforcing material, and 30 to 3% of magnesium hydroxide. At 5% by weight, after the organic-inorganic composite composition is kneaded, when this mixed composition is injection-molded, the molding conditions such as the temperature of the molten resin and the mold temperature are wide, and the reinforcing material and water are added after molding. There was little precipitation of magnesium oxide on the surface of the molded article. Therefore, it is possible to easily form a molded product and to obtain a molded product having a smooth surface. In addition, when a black dye is added to the organic-inorganic composite composition, a black molded article is obtained. However, if the organic-inorganic composite composition is used as the composition, the surface of the reinforcing material and the magnesium hydroxide molded article can be obtained. Since there is little precipitation, a molded article having a good appearance with little whitening of the molded article can be obtained. In particular, since the appearance of the housing is important, it is preferable to apply the housing to the housing. In addition, the range of molding conditions, such as the temperature of the molten resin and the temperature of the mold, is wide, so that it is easy to obtain a complex case base and cover, especially a complex base shape, compared to a handle. It is possible. In addition, since the base and cover of the housing are larger than parts such as the handle and the crossbar, a large temperature gradient occurs before and after molding.However, a composition with a wide range of molding conditions, such as molten resin temperature and mold temperature, is used. This will increase the degree of freedom in molding conditions such as temperature control, and contribute to the production efficiency of the base and base.

When Nylon 6 or Nylon 6 alloy is 35 to 45% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight, More preferably, for samples 2 to 4, that is, 35 to 45% by weight of nylon 6 or nylon 6 series alloy, 20 to 25% by weight of reinforcing material, and 35 to 45% by weight of magnesium hydroxide At 40% by weight, the dimensional change after molding is smaller, the dimensional change after molding is small, and the production defect rate is low. In particular, when nylon 6 or nylon 6 alloy is 35 to 40% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight, it is more preferable. Or, for samples 3 and 4, that is, 35 to 40% by weight of nylon 6 or Nylon 6 series alloy, 20 to 25% by weight of reinforcing material, and 40% by weight of magnesium hydroxide At this time, the dimensional change after molding is very small, and the defective production rate is very low.

In the above test, in the description of samples 1 to 4, the case of Nylon 6 as Nylon 6 or Nylon 6 series alloy was described, but the dimensions after molding were also used in the case of Nylon 6 series alloy. In terms of change It was a fruit. Here, Nylon 6 and Nylon 6 series alloys are described because of their unique features. Since Nylon 6 alloy is an alloy of a material having a lower hygroscopicity than Nylon 6, it was more effective than Nylon 6 in dimensional change after moisture absorption. On the other hand, the alloys of Nylon 6 and Nylon 6 with Nylon 66 are more insulated after shutting down than Nylon 6 series alloys (excluding Nalloon 6 and Nylon 66 alloy). It turned out that the performance was good.

As described above, the switch partially constituted by the molded article made of the organic-inorganic composition according to the present embodiment is made of Nylon 6 or Nylon contained in the organic-inorganic composite composition. 6 series alloy, reinforcing material, and magnesium hydroxide are distributed at a specific ratio, so they have high insulation after switching off the switch, provide flame retardancy, and have small dimensional changes after molding. Low defect rate, high rigidity after molding, and excellent cleaving resistance. In addition, since this molded article does not use a halogen-based phosphorus-based additive as a flame-retardant imparting material, there is no doubt that dioxin or phosphine will be generated during combustion, and it is non-toxic. New

In addition, since Nylon 6 or Nylon 6-based alloy itself has a relatively high decomposition temperature as a resin, it contributes to an improvement in insulation performance after interruption. In addition, the compositions of Samples 1 and 2 are more preferable in terms of productivity and appearance because they have a wide range of molding conditions, such as the temperature of the molten resin and the mold temperature, and the precipitation of the reinforcing material and magnesium hydroxide on the surface is small. New

Further, the compositions of Samples 3 and 4 are more preferable for the dimensional change after moisture absorption because the dimensional difference Δa is very small and the dimensional a belongs to the approximate center of the dimensional allowable range.

Although the pace of the circuit breaker housing has been described as a molded product, other components such as a power pad, a handle, a cross pad, and the like may be used. Power Since the housing composed of the base, base, cover and base is one of the components with the largest overall length among the components of the switch, a molded product with the composition of this embodiment is used. This is preferable because the effect of dimensional change after molding is reduced and the production defect rate can be reduced efficiently.

Regarding the dimensional change of the molded product after assembling, part of the molded product is fixed by other parts by assembling, and the dimensional change that affects the performance of the switch is added. Rarely.

Next, another embodiment of the present invention will be described.

The molded article of the insulating component constituting a part of the switch according to the present embodiment is composed of 35 to 45% by weight of nylon 6 or nylon 6 series alloy, and 15 to 25% by weight of nylon. An organic-inorganic composite composition containing a reinforcing material, 30 to 40% by weight of magnesium hydroxide, and 5 to 15% by weight of an inorganic material having a low orientation is obtained by injection molding into a mold. Can be

Examples of the inorganic substance having a low orientation include alumina, calcined clay, unfired clay, silica, calcium silicate, magnesium oxide, calcium carbonate, magnesium carbonate, talc, myric acid, and wallacetonite. One or more of these inorganic substances may be used.

Of these, calcined clay, silica, calcium carbonate, and wallacetonite are preferred because of the good surface gloss of the molded product. Furthermore, baked crepe and wallacetonite are preferred because they are hardly damaged.

Next, the amount of distortion of the molded article and the percentage of defective parts at the time of transporting the parts according to the mixing ratio of the organic-inorganic composite composition will be described.

[Measuring distortion of molded product]

First, a test molded product will be described. FIG. 2 is a perspective view of a cover (90 mm width × 155 mm length × 28 mm height) of the circuit breaker housing. FIG. 3 is a view of the cover shown in FIG. 2 viewed from the direction A in FIG. FIG. In FIG. 3, b indicates the amount of distortion.

The molded article is molded (width dimension a immediately after molding is 89.5 mm to 89.6 mm), and then left at room temperature and humidity for 24 hours. Was measured. In addition, the distortion amount of a total of 100 molded articles was measured for each sample (including the comparative example). If 97 or more molded products have a distortion amount within 0.5 mm, the test is passed. If it is 96 or less, the test is rejected. In Table 2 below, X is unacceptable, 〇, ◎ is acceptable, and ◎ is very preferable because the variation in the amount of distortion is extremely small (the standard deviation of the amount of distortion is small).

[Defective rate when transporting parts]

The process of removing the molded product from the mold by an automatic unloader and placing it on the belt conveyor, packing the molded product on the belt conveyor, transporting the boxed molded product, molding In order to assemble the parts, we performed a normal production process consisting of removing the boxed molded parts from the box, inspecting the appearance of the molded parts (parts), and calculating the defect rate during part transport. In Fig. 2, the test was rejected when there were three or more scratches with a length of 2 mm or more on the external surface (design surface), and passed when there were two or less. The exterior surface is the surface that can be seen from the side surfaces ② and ② and the top surface ③ in Fig. 2. In addition, for each sample (including the comparative example), the defective rate at the time of parts transport of a total of 100 molded articles was measured.

As Comparative Example 2, a molded article having a composition comprising 50% by weight of nylon 6, 25% by weight of magnesium hydroxide, and 25% by weight of glass fiber as a reinforcing material was compared. As Example 3, a molded article having a composition comprising 50% by weight of nylon 6, 40% by weight of magnesium hydroxide, and 10% by weight of glass fiber as a reinforcing material was used. In Table 2 below, X indicates failure, 〇, ◎ indicates pass, and ◎ indicates a case where the defect rate is very good (the defect rate is 0.6% or less).

Table 2 shows the test results. Table 2

As shown in Table 2. The molded article of Comparative Example 2 has a good defect rate at the time of component transport, but has a large amount of distortion.The molded article of Comparative Example 3 has a small distortion amount and is good, but the defective rate at the time of component transport. Is out of the allowable range.

On the other hand, for sample 58, the distortion amount was within the allowable maximum value of 0.5 mm, and the defect rate during component transportation was 1.0% or less, which was a good result. For sample 78, that is, 35 to 40% by weight of nylon 6 or nylon 6 series alloy, approximately 15% by weight of glass fiber (reinforcing material), and 30 to 35% by weight of water Magnesium oxide and approximately 15% by weight of wollastonite (an inorganic material with low orientation) were found to be extremely excellent in terms of the amount of distortion and the rejection rate during part transport.

When the amount of the inorganic substance used in the composition of the organic-inorganic composite composition is less than 5% by weight, the distortion of the molded article is insufficiently reduced, and when the amount exceeds 15% by weight, the obtained value is obtained. The mechanical strength of the molded article tended to decrease. In Table 2, in the case where calcined clay was used for the inorganic substance, The results are similar.

Note that the molded articles according to Samples 5 to 8 of the present embodiment having an inorganic material having a low orientation in the composition all have a dimensional difference Δa in the dimensional change test after molding described in the above-described embodiment. It was very small and the dimension a belonged to the approximate center of the dimension tolerance, which was a more favorable result with respect to the dimensional change.

As described above, the switch partially constituted by the molded article made of the organic-inorganic composition according to the present embodiment is used for the nylon 6 or nylon 6-based switch contained in the organic-inorganic composite composition. Alloy, reinforcing material, magnesium hydroxide, and inorganic material with low orientation are distributed in a specific ratio, so that they have high insulation properties after switching off the switch, provide flame retardancy, and after molding The dimensional change is extremely small and the production failure rate is low, the rigidity is high after molding and the creep resistance is excellent, and the failure rate when transporting parts is small. In particular, in comparison with the molded article of the above-described embodiment that does not use an inorganic material having a low orientation, the molded article of the present embodiment is significantly superior in terms of the amount of distortion and the defective rate at the time of parts transport, and the production defective rate Has been dramatically reduced.

If calcined clay, silica, calcium carbonate, or wallacetonite is used as the inorganic substance, the surface gloss of the molded product is good. In addition, the use of calcined clay and wallacetonite makes it less likely that the molded product will be damaged. Therefore, the molded article of the present embodiment is significantly superior to the molded article of the above-described embodiment in which an inorganic material having a low orientation is not used, in that the surface gloss and scratch resistance are low.

Although the cover of the case of the circuit breaker has been described as a molded product, other components such as a base, a handle, a cross pad, etc. may be used. In addition, since the casing such as the cover and the base is a part having the largest overall length, the use of the molded article having the composition of the present embodiment can reduce distortion and efficiently reduce the defective production rate. It is preferable because it can be reduced to a minimum. In addition, the housing cover It is preferable to use a molded article having the composition of the present embodiment because the surface is less likely to be scratched. Industrial applicability

As described above, the switch according to the present invention can be applied to a small switch having a high breaking capacity.

Claims

The scope of the claims

Organic-inorganic material containing 1.3 to 50% by weight of Nylon 6 or Nylon 6 alloy, 15 to 25% by weight of reinforcing material, and 30 to 40% by weight of magnesium hydroxide A switch characterized in that a part thereof is formed by a molded product of a composite composition.

2. Nylon 6 or Nylon 6 alloy is 45 to 50% by weight, reinforcing material is 20 to 25% by weight, and magnesium hydroxide is 30 to 35% by weight. The switch according to claim 1.

3. The claim is characterized in that Nylon 6 or Nylon 6 alloy is 35 to 45% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight. 2. The switch according to item 1 above.

4. Nylon 6 or Nylon 6 alloy is 35 to 40% by weight, reinforcing material is 15 to 25% by weight, and magnesium hydroxide is 30 to 40% by weight. The switch according to claim 1.

5. The switch according to claim 3, wherein the molded article is a housing.

6.3 to 45% by weight of Nylon 6 or Nylon 6 series alloy, 15 to 25% by weight of reinforcing material, 30 to 40% by weight of magnesium hydroxide, and 5 to 15% A switch characterized in that a part thereof is constituted by a molded article of an organic-inorganic composite composition containing an inorganic substance having a low orientation of weight%.

7. The switch according to claim 6, wherein the inorganic substance is calcined clay and / or wollastonite.

8. The switch according to claim 6, wherein the molded article is a housing.

9. Claim 8 characterized in that the molded article is the base of the housing On-board switch.