JPH06139854A - Insulating polymer material composition for outdoor use - Google Patents

Abstract

PURPOSE:To provide a lightweight insulating polymer material composition having water repellency by improving the weather resistance and tracking resistance of a polymer insulating material made of a resin material. CONSTITUTION:EPDM rubber is selected for a polymer material, and aluminum hydroxide serving as a filler and silicone oil introduced with the carboxyl group at both terminals of polysiloxane are added to the EPDM rubber. A kneaded object of these three constituents is molded by an injection molding means to form an outdoor insulating polymer material composition. The oil introduced with the carboxyl group into the side chain of polysiloxane or the oil introduced with the carboxyl group into one terminal of polysiloxane is used for the silicone oil. Aluminum hydroxide of 80-240 pts.wt. and silicone oil of 0.5-10 pts.wt. are added to the EPDM rubber of 100 pts.wt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article made of an insulating polymer material which is directly exposed to the outdoors by a high-voltage device, such as a composition such as an insulator, an insulator tube, a spacer and a bushing.

[0002]

2. Description of the Related Art As an insulating material composition for forming a molded article that is directly exposed to the outdoors by a high-voltage device, for example, an insulator, an insulator tube, a spacer, a bushing, the examples described in the following technical documents are known. .

(1) Electrical and Electronic Advanced Technology Exhibition and Technology Seminar: "Current State of Outdoor Polymer Insulators" Watanabe, Takahashi et al. Long-term properties of polymers for insulators ”NGK Kunieda, Shinoboku, Nakai (3) Rubber Technology Symposium: Rubber Kneading-Theory and Practical Science 1,2,3 (Technical Committee of the Japan Rubber Association) As described in the above technical literature. In addition, as the insulating material and the structural material that are directly exposed to the outdoors by high-voltage equipment, porcelain products that do not deteriorate electrically or mechanically have been used.

However, as typified by such conventional insulating materials and structural materials, for example, porcelain, porcelain has a large specific gravity, so that the product itself becomes heavy and the strength of the steel tower is limited, and the porcelain is made compact and beautiful. There is a drawback that it is hindering In addition, because the porcelain itself is hard and brittle, the insulator's cap is cracked by the impact of electrical energy when flashing in the air on the outside of the insulator, causing parts to fall from the steel tower or the Solester element. The problem with the internal porcelain insulator is that the air in the gap between the porcelain and the porcelain may expand and explode due to the energy caused by penetrating the element or flashing outside the element that occurs when absorbing an excessive lightning surge. There is a point.

In view of the above, replacement of a porcelain product with a polymer material, which is relatively high in impact resistance and lighter in weight than porcelain, has been studied. At the initial stage, epoxy resin is selected as the polymer material. This epoxy resin ranges from low-viscosity liquid to solid, and easily cures at room temperature or under heating in the presence of a curing agent or catalyst. It is known to give a cured product which has a characteristic that it shrinks little at the time of curing, does not generate water or gas, and is highly reactive.

[0006]

However, the above-mentioned polymer materials, especially the epoxy resin which was examined in the early stage, have insufficient outdoor resistance, tracking resistance, etc., and also have cracks during flashover. There is a problem.

In order to deal with the above-mentioned problems, a method of coating a surface of an epoxy resin adopted as a polymer material with a silicone resin or the like is considered, but this method requires a time-consuming and troublesome process. In the present situation, the improvement of the epoxy resin is essentially required. However, even if a grade with high weather resistance is selected as the epoxy resin, it is a matter of relative rank among the epoxy resins after all, and it is not a fundamental solution to the problem.

Therefore, the present invention solves the problems of such conventional insulating materials and structural materials, is excellent in weather resistance and tracking resistance, and is improved in moisture resistance and insulation resistance characteristics. The purpose is to obtain a lightweight insulating polymer material composition having water-based properties.

[0009]

In order to achieve the above object, the present invention first selects EPDM rubber as a polymer material according to claim 1, and at the same time, uses aluminum hydroxide as a filler in the EPDM rubber. , A silicone oil having a carboxyl group introduced at both ends of polysiloxane is added thereto, and the three-component kneaded product is molded by injection molding means to form an outdoor insulating polymer material composition. An example in which a carboxyl group is introduced into the side chain of polysiloxane is used as the silicone oil according to claim 2, and a silicone oil in which a carboxyl group is introduced into one end of the polysiloxane is used as the silicone oil. I will provide a. Further, according to claim 4, 80 to 240 parts by weight of aluminum hydroxide and 0.5 part of silicone oil are added to 100 parts by weight of EPDM rubber.
Provided is an outdoor insulating polymer material composition containing 10 to 10 parts by weight.

[0010]

According to such a polymer material composition, by adding aluminum hydroxide and the above-mentioned various silicone oils as a filler to EPDM rubber, these silicone oils have a functional group excellent in compatibility with the polymer material. Since it has, it has excellent weather resistance and tracking resistance.
A polymer composition having good water repellency and outdoor insulation resistance can be obtained. The specific gravity of the obtained composition is less than half of the specific gravity of porcelain, and the weight when commercialized is greatly reduced.

[0011]

EXAMPLES Hereinafter, specific examples of the outdoor insulating polymer material composition according to the present invention will be described. The above composition in this example provides materials and material compositions used for molded articles such as insulators, insulators, spacers, bushings, etc. that are directly exposed to the outdoors by high voltage equipment.

[0012] Normally, the requirements for the outdoor insulating polymer material are that the voltage is constantly applied under the natural environment such as irradiation of sunlight, especially ultraviolet rays and temperature change and wind and rain.
In addition to the essential requirement that the material does not change in quality under the so-called outdoor exposure voltage application condition and does not break, it is a major requirement that the material itself has water repellency and is lightweight.

In this embodiment, since the above requirements are satisfied,
Ethylene propylene diene monomer rubber (hereinafter abbreviated as EPDM rubber) was selected as the polymer material, and aluminum hydroxide having excellent outdoor insulation resistance and flame retardancy was used as the filler. The above-mentioned two components are the center of the characteristic for improving the weather resistance and the tracking resistance, but in the present embodiment, the silicone having a functional group excellent in compatibility with the polymer material is used in order to further improve the characteristic. An oil was added, and the effect of adding the silicone oil was confirmed from the viewpoint of the water repellent property of the composition.

Further, in this example, an appropriate amount of stearic acid was added to enhance the releasability at the time of molding, zinc white was added to improve the strength, and carbon black was added to enhance the weather resistance. A vulcanizing agent for vulcanizing and a vulcanization accelerator were added.

[0015] In carrying out the implementation, Espren 670F manufactured by Sumitomo Chemical was used as the EPDM rubber, and H-43M which is a Heidilite series manufactured by Showa Denko as aluminum hydroxide.
It was used.

As the silicone oil, three types of reactive silicone oil manufactured by Shin-Etsu Chemical Co., Ltd. were adopted. That is,
X-22-162A in which a carboxyl group is introduced into both terminals of polysiloxane in the silicone oil, and X-22-in which a carboxyl group is introduced into a side chain of the polysiloxane.
3701E and X-22-173B having a carboxyl group introduced at one end of the polysiloxane were used.

EPDM rubber is a general term for compounds having two conjugated double bonds. Generally, a rubbery copolymer of ethylene and propylene is called EPM, and an unsaturated group is added to the polymer and a side chain. The one is the EPDM rubber. Incidentally, these may be collectively referred to as EPR (ethylene propylene rubber).

The Heidilite series is a typical aluminum hydroxide produced by the Bayer method, and among them, H-43M used in this embodiment belongs to the fine grain Heidilite. This H-43M violently dehydrates and decomposes with a large endothermic reaction at 200 to 350 ° C., and when added to rubber, the temperature rise during heating is suppressed and self-extinguishing property is promoted to suppress smoke generation, and harmful gas is emitted. It does not occur, and it has the advantages of improved arc resistance and tracking resistance.

Specific examples of the present invention will be described below. That is, the above-mentioned Esprene 670F, H-43M, and silicone oil X-22-162A together with an appropriate amount of stearic acid, zinc white, carbon black, a vulcanizing agent and a vulcanization accelerator are kneaded under a temperature of about 10 hours (a half-life). Kneading was sufficiently performed, and a sample was prepared by injection molding means. As is well known, the injection molding means is a method in which a molding material is heated and melted in an injection cylinder, and the fluidized molding material is pressed into a mold closed tightly by an injection plunger or a screw to mold the molding material. Half-life 1 after molding
Vulcanization was performed at a temperature of about 5 minutes for 5 minutes. An organic peroxide was used as the vulcanizing agent.

The sample vulcanized as described above was dipped in purified water for 30 minutes and then taken out from the water and the water content after 30 seconds, that is, the residual water content was determined by gravimetric measurement. It was judged that the water repellent property was high.

Table 1 shows the results of measuring the above-mentioned residual water content (g) by preparing three types of comparative samples prior to the implementation.

[0022]

[Table 1]

Comparative Examples 1, 2, and 3 in Table 1 are EPDs.
Aluminum rubber (ATH) 80 to M rubber
phr, 160 phr and 240 phr are added, and the results of measuring the residual water content (g) of the sample to which silicone oil is not added are shown. The residual water contents of Comparative Examples 1, 2, and 3 were 0.23 g, 0.30 g, and 0.45 g, respectively.

Next, a sample to which this embodiment is applied is prepared,
The results of measuring the residual water content are shown in Tables 2 to 6.

[0025]

[Table 2]

[0026]

[Table 3]

[0027]

[Table 4]

[0028]

[Table 5]

[0029]

[Table 6]

According to Examples 1, 2, 3, and 4 shown in Table 2, 80 phr (per hundred) aluminum hydroxide (ATH) H-43M was used as a filler in Esplen 670F.
resin), silicone oil X-22-162A
0.5 phr, 2 phr, 5 phr, 10 p
It is the result of measuring the residual water content (g) for each sample added with hr and molded by the above-mentioned molding means, and the residual water content is 0.12 g, 0.04 g, 0.03 g, respectively.
It was 0.02 g.

In the case of Examples 5.6.7 and 8 shown in Table 3, the amount of aluminum hydroxide H-43M added was 120 p.
and 0.5 phr, 2 phr, 5 phr, and 10 phr of silicone oil were added in the same manner as in the above examples, and the residual water content of each sample was 0.18 g, 0.05 g, and 0.
It was 03g and 0.03g.

In the case of Examples 9, 10, 11 and 12 shown in Table 4, the amount of aluminum hydroxide H-43M added was 160.
phr, silicone oil 0.5ph each
The residual water content of each sample added with r, 2 phr, 5 phr, and 10 phr was 0.22 g, 0.07 g, 0.07 g,
It was 0.06 g.

Examples 13, 14, 15, 16 shown in Table 5
In the case of, the addition amount of aluminum hydroxide H-43M is 20
0 phr, 0.5 ph for each silicone oil
The residual water content of each sample added with r, 2 phr, 5 phr, and 10 phr was 0.27 g, 0.09 g, 0.08 g,
It was 0.07 g.

Further, Examples 17, 18, 19, shown in Table 6,
In the case of 20, the amount of aluminum hydroxide H-43M added was 240 phr, and the silicone oil was 0.5
The residual water content of each sample added with phr, 2 phr, 5 phr, and 10 phr is 0.29 g, 0.10 g, 0.10
It was g, 0.09g.

The above 80 phr is Esprane 67.
It shows that H-43M is added in an amount of 80 parts by weight with respect to 100 parts by weight of 0F.

According to Tables 2 to 6, H-43M is 80 p
hr-240 phr, silicone oil 0.5 phr
The residual water content of each sample to which 10 phr was added is sufficiently smaller than that of Comparative Examples 1, 2, and 3, and the addition amount of silicone oil KF-105 is 2 phr to 10 p.
It was confirmed that it is preferable to be in the range of hr.

Next, in place of the silicone oil X-22-162A as the water repellent agent in the above examples, another reactive silicone oil X-22-3701E is used.
The residual water content of each sample was measured in the case of using X-22-173B and X-22-173B, but values within the measurement error range with respect to the measurement values shown in Tables 2 to 6 were obtained. Therefore, no significant change in the measured values due to the difference in silicone oil was observed, and basically the same measurement results were obtained for the three types of silicone oils.

Further, the specific gravity of the conventional porcelain is 2.
7, the specific gravity of the sample obtained in this example is 1.0 to 1.3, which is less than half the specific gravity of the porcelain, and the weight when commercialized is greatly reduced. Is possible.

[0039]

As described in detail above, according to the outdoor insulating polymer material composition of the present invention, the EPDM rubber has excellent compatibility with aluminum hydroxide as a filler and the polymer material. By adding a silicone oil having a functional group, it is possible to obtain an insulating polymer material composition having good outdoor insulation resistance, high practicality, and water repellent property. Further, it does not take a lot of time and effort at the time of production, and the specific gravity of the obtained composition is not more than half of the specific gravity of the porcelain, and it is possible to obtain an effect that the weight when commercialized is significantly reduced.

Particularly, by using aluminum hydroxide composed of fine particles as a filler added to EPDM rubber,
It is possible to obtain an insulating composition in which the temperature rise during heating is suppressed, the weather resistance and the tracking resistance are excellent, the moisture resistance and the insulation resistance characteristics are improved, and the self-extinguishing property is promoted.

Front Page Continuation (72) Inventor Koichi Tsunakawa 2-17 Osaki, Shinagawa-ku, Tokyo Stock Company Shameidensha

Claims (4)

[Claims] 1. An EPDM rubber is selected as a polymer material, and aluminum hydroxide as a filler and silicone oil having carboxyl groups introduced at both ends of polysiloxane are added to the EPDM rubber, and the above three components are added. An outdoor insulating polymer material composition, characterized in that a kneaded material of the system is molded by injection molding means. 2. The EPDM rubber is selected as the polymer material, and aluminum hydroxide as a filler and silicone oil having a carboxyl group introduced into the side chain of polysiloxane are added to the EPDM rubber, and the above three components are added. An outdoor insulating polymer material composition, characterized in that a kneaded material of the system is molded by injection molding means. 3. An EPDM rubber is selected as a polymer material, and aluminum hydroxide as a filler and silicone oil having a carboxyl group introduced at one end of polysiloxane are added to the EPDM rubber, and the three-component system is prepared. An outdoor insulating polymer material composition, characterized in that the kneaded product of (1) is molded by injection molding means. 4. An aluminum hydroxide of 80 to 240 parts by weight and a silicone oil of 0.5 to 10 parts by weight are added to 100 parts by weight of EPDM rubber.
The outdoor insulating polymer material composition described.