JP2011198700A - Insulating member for gas insulated switch, manufacturing method therefor, and gas insulated switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weighted gas insulated switch of high reliability, excellent, of course, in insulating performance, excellent also in hydrogen fluoride resistance, and having high heat resistance, a high strength and a high elastic modulus.SOLUTION: This insulating member for the gas insulated switch is constituted of an organic fiber-reinforced composite material composited by a polyarylate fiber on the surface of and in the insdie of which an epoxy resin is added, with a thermosetting resin such as an epoxy resin. The insulating member for the gas insulated switch is manufactured by immersing the polyarylate fiber into a dispersion liquid dispersed with the epoxy resin in an aqueous solvent, curing the epoxy resin, impregnating thereafter the thermosetting resin into the polyarylate fiber, and heating to be cured.

Description

  The present invention relates to an insulating member for a gas-insulated switch, a manufacturing method thereof, and a gas-insulated switch using the insulating member as an insulating operation rod.

  As an insulating material, a glass fiber reinforced composite material excellent in electrical insulation and mechanical strength is generally known. However, there are drawbacks such as high specific gravity and being affected by acidic gases such as hydrogen fluoride gas. On the other hand, an organic fiber reinforced composite material using high strength organic fibers having high strength, high elastic modulus and excellent heat resistance is lightweight and excellent in acid resistance, and is expected as an alternative material for glass fiber reinforced plastic.

  Conventionally, aramid fibers represented by Kevlar (registered trademark) are known as high-strength organic fibers having high strength, high elastic modulus, and excellent heat resistance, and various fiber-reinforced composite materials using these as reinforcing fibers are known. Has been studied in the field. However, aramid fibers are known to have low adhesive strength at the interface between fibers and matrix resin compared to glass fibers and carbon fibers, which are other practical reinforcing fibers, because the fiber surface is inactive. ing.

  For example, in the case of glass fiber, surface treatment using a silane coupling agent is performed. In the case of carbon fiber, a surface treatment using plasma or anodization is performed. On the other hand, chemical surface treatments using various chemical treatments and plasma treatments have been attempted for high-strength organic fibers. In such a treatment, there is a problem that the fiber is deteriorated due to an excessive reaction, and in the plasma treatment, the surface modifying groups are reduced in a short time. In addition to chemical surface treatment, plasma discharge and excimer laser irradiation are known as methods for etching the surface of aramid fibers. However, any method that activates these inert surfaces reduces the crystallinity and orientation of the fiber structure, resulting in significant degradation of the composite material properties.

  The surface treatment of aramid fibers that is carried out industrially is a technique for removing the oil agent applied during spinning by extraction. This technique merely removes the oil agent that acts at the interface as a lubricant and is significant as a technique that does not impair the crystallinity and orientation of the aramid fibers, but does not improve the adhesive strength with the matrix resin.

  A method of impregnating a fiber with an adhesive is known as a method of not directly changing the fiber surface chemically, physically or morphologically (see, for example, Patent Document 1). In the method described in Patent Document 1, the adhesive and the fiber are mainly bonded by physical adsorption. Therefore, even if this method is applied to highly hygroscopic fibers, there is a problem that sufficient adhesive strength at the interface cannot be obtained, and electrical characteristics and mechanical characteristics cannot be improved.

  If the bond strength between the fiber and the matrix resin is low in the fiber reinforced composite material, not only the mechanical properties of the fiber reinforced composite material are inferior but also the medium such as water at the interface between the fiber and the matrix resin. It will allow intrusion. In particular, in an aramid fiber having high hygroscopicity, water intrusion may significantly reduce the insulating property of the fiber-reinforced composite material, and may cause microscopic destruction of the matrix resin. In addition, since the aramid fiber has poor wettability with the matrix resin, voids are likely to be generated inside the fiber reinforced composite material, and partial discharge may occur in the generated voids, which may be destroyed in an instant. It was.

  Insulating operation rods used in gas insulated switches and the like are used to electrically insulate and support a high-voltage conductor for energization disposed in a metal container filled with sulfur hexafluoride from the metal container. Used. Sulfur hexafluoride is a gas medium with excellent insulation performance and arc-extinguishing performance, but decomposes by discharge generated when the current is interrupted, etc., and reacts with adsorbed water in a metal container to produce hydrogen fluoride gas. To do. As a material used for an insulating operation rod, a glass fiber reinforced composite material having excellent electrical insulation and mechanical strength is generally used. However, glass fiber is eroded by hydrogen fluoride gas generated when an electric current is interrupted. The mechanical strength and surface resistance may be reduced. Therefore, when an insulating operation rod made of glass fiber reinforced composite material and a circuit breaker having a discharge generating part are housed together in a metal container filled with sulfur hexafluoride, hydrogen fluoride of the insulating operation rod is used. It would be desirable to improve resistance to gases.

As a method for improving the resistance of the insulating operation rod to hydrogen fluoride gas, a method of applying an epoxy-modified polyimide resin, an alumina-filled paint or the like to the surface of a glass fiber reinforced composite material has been proposed (for example, Patent Document 2 and 3). However, when the epoxy-modified polyimide resin or alumina-filled paint is applied to the surface of the glass fiber reinforced composite material, the coating strength of the applied epoxy-modified polyimide or alumina-filled paint is weak, and deterioration due to peeling occurs. However, it was not easy to maintain the corrosion resistance.
In addition, although the insulating operation rod used for the driving operation is required to be reduced in weight, the glass fiber reinforced composite material has a problem that the insulating operation rod constituted by this is heavy because the specific gravity of the glass fiber is large.

JP-A-11-181679 JP 2006-333567 A Japanese Patent Application Laid-Open No. 07-134909

  The present invention eliminates the drawbacks of the above-described conventional insulating rod made of glass fiber reinforced composite material and is excellent in insulation, as well as excellent in fluorination resistance that is lightweight and does not require a protective layer. An object of the present invention is to provide a highly reliable insulating member for a gas-insulated switch having hydrogen gas properties, high heat resistance, high strength, and high elastic modulus.

Therefore, as a result of intensive studies to solve the above-mentioned problems, the present inventors use low hygroscopic polyarylate fibers in which epoxy resin is infiltrated / fixed into the fiber bundle gaps or fiber cloth stitches as reinforcing fibers. The organic fiber reinforced composite material obtained by combining with a thermosetting resin is lightweight and has excellent hydrogen fluoride gas resistance, high heat resistance, high strength, and high elastic modulus that do not require a protective layer. As a result, the present invention has been completed.
That is, the insulating member for a gas-insulated switch according to the present invention is composed of an organic fiber reinforced composite material in which a polyarylate fiber having an epoxy resin applied to the fiber surface and inside the fiber and a thermosetting resin are combined. And
The thermosetting resin used for the insulating member for gas insulated switch of the present invention is preferably an epoxy resin.
The gas insulated switch according to the present invention is characterized in that the above-described insulating member for a gas insulated switch is used as an insulating operation rod.
Further, the method for producing an insulating member for a gas insulated switch according to the present invention is obtained by immersing a polyarylate fiber in a dispersion liquid in which an epoxy resin is dispersed in an aqueous solvent, curing the epoxy resin, and then obtaining the polyarylate fiber obtained. It is characterized by impregnating with thermosetting resin and heat-curing.

  According to the present invention, it is not only excellent in insulation, but also light weight, excellent hydrogen fluoride gas resistance without the need for a protective layer, high heat resistance, high strength, and high reliability having high elastic modulus. An insulating member for a gas insulated switch can be provided.

It is the schematic which shows an example of the gas insulated switch which used the insulating member for gas insulated switches of this invention as an insulation operation rod. It is a figure which shows the insulation operating rod comprised with the insulating member for gas insulated switches of this invention, (a) is a perspective view, (b) is a side sectional view, (c) is a front sectional view.

Embodiment 1 FIG.
An insulating member for a gas insulated switch according to Embodiment 1 of the present invention is composed of an organic fiber reinforced composite material in which a polyarylate fiber having an epoxy resin applied to the fiber surface and inside the fiber and a thermosetting resin are combined. Is done. In this organic fiber reinforced composite material, the epoxy resin applied to the polyarylate fiber serves as an anchor, and the adhesive strength between the thermosetting resin as the matrix resin and the fiber is increased, and the strength of the composite material as a whole is also increased. ing. Further, a polyarylate fiber (preferably a polyarylate fiber having an average moisture content of less than 0.1% when measured at 20 ° C. and 65% Rh), which is an aromatic polyester fiber having low hygroscopicity, is a reinforcing fiber. It is not only lighter than glass fiber, but also has little electrical and mechanical deterioration due to water absorption and moisture absorption when making composite materials and using composite materials. High resistance to strong acids. Therefore, the insulating member for a gas-insulated switch according to the present embodiment is lightweight, has excellent hydrogen fluoride gas resistance, high heat resistance, high strength, and high elastic modulus, and maintains excellent insulating performance over a long period of time. can do.

The insulating member for a gas insulated switch according to the present embodiment is obtained by immersing polyarylate fibers in a dispersion obtained by dispersing an epoxy resin called water-based epoxy resin or water-dispersed epoxy resin in an aqueous solvent, Or after making it harden | cure by heating and making it fix on a polyarylate fiber, the thermosetting resin can be impregnated to the polyarylate fiber, and it can manufacture by heat-hardening.
As a method of applying an epoxy resin to the polyarylate fiber, by using an aqueous dispersion, it can be processed from the high permeability due to its low viscosity to every corner of the fiber, and the solvent is aqueous, There is no performance degradation due to the effect of residual organic solvent. The step of applying the epoxy resin to the polyarylate fiber may be applied to the polyarylate fiber filament before knitting the cloth, or may be applied to the polyarylate fiber filament before being wound around the mandrel in the filament winding method (FW method). Although it is good, it is preferable to apply to the polyarylate fiber cloth after removing the oil agent and paste applied at the time of spinning and weaving.

One of the effects of the treatment of applying the epoxy resin to the polyarylate fiber is that the epoxy resin partially penetrates and adheres to the filament bundle gap of the polyarylate fiber or the knitting of the polyarylate fiber cloth, thereby improving the surface of the fiber. In addition to the anchor effect, the cross contact point of the fiber filaments of the fiber cloth is fixed, and the epoxy resin in that portion becomes a strong anchor, and the adhesive strength with the matrix resin is increased. Further, since conventional chemical surface treatment such as plasma treatment is not performed, the high heat resistance, high strength and high elastic modulus of the polyarylate fiber are maintained.
Furthermore, the structural reinforcement effect of polyarylate fiber is mentioned. In general, the structure of the organic fiber filament is not a homogeneous lump like glass fiber, and a fine fibrous structure (fibril) is further present under the surface skin layer. The fiber fibrillation phenomenon in which a fibrous structure further appears becomes remarkable. For this reason, when organic fibers such as polyarylate fibers are used in fiber reinforced composite materials, even if only the fiber surface is modified to improve the adhesive strength at the interface, fiber damage due to fibrillation is likely to occur, and fiber brittleness due to fibrillation is likely to occur. This leads to a decrease in the properties of the fiber reinforced composite material. It is thought that the process which provides an epoxy resin to a polyarylate fiber has also contributed to suppression of the fiber embrittlement by fibrillation.

  Therefore, the organic fiber reinforced composite material using polyarylate fiber with epoxy resin applied to the fiber surface and inside the fiber as the reinforcing fiber has high impact resistance that could not be achieved with organic fiber reinforced composite material using general-purpose organic fiber. Reinforcing performance such as property, bending stress and tensile stress can be exhibited.

  The raw resin of polyarylate fiber is a molten liquid crystal polymer, and has a repeating structural unit derived from aromatic diol, aromatic dicarboxylic acid, aromatic hydroxycarboxylic acid and the like. For example, the polymer which consists of a repeating structural unit represented by following (1)-(11) is mentioned.

  Among the above-mentioned molten liquid crystal polymers, a polymer comprising a combination of repeating structural units represented by (5), (8) and (9) is preferred, and a polymer comprising a repeating structural unit represented by (5) is more preferred, Aromatic polyesters containing 4 mol% or more and 45 mol% or less of the following component (B) are most preferable.

  The molten liquid crystal polymer used in the present embodiment is a polymer having a melting point of preferably 250 ° C. or higher and 350 ° C. or lower, more preferably 260 ° C. or higher and 320 ° C. or lower. The melting point here is measured by a test method based on JIS K7121, and is the peak temperature of the main endothermic peak observed with a differential scanning calorimeter (DSC). Although Vectran (registered trademark) after spinning is a melt-spun fiber, it does not cause melt drip by solid phase polymerization after spinning, does not show a clear melting point by DSC measurement, and is not less than 400 ° C. It decomposes and carbonizes.

  As long as the effects of the present invention are not impaired, a thermoplastic polymer such as polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyester ether ketone, fluororesin is used in combination with the molten liquid crystal polymer. Also good. Various additives such as inorganic fillers such as titanium oxide, kaolin, silica, and barium oxide, colorants such as carbon black, dyes, and pigments, antioxidants, ultraviolet absorbers, and light stabilizers are added to the molten liquid crystal polymer. It may be added.

  The polyarylate fiber filament made of the molten liquid crystal polymer used in the present embodiment may be a fiber bundle formed by converging a large number of filament yarns as long as it is a continuous fiber. It may be added yarn. The fiber diameter and the number of filaments of the reinforcing fiber constituting the fiber bundle are not particularly limited, but the fiber diameter is preferably 3 μm or more and 200 μm or less, more preferably 5 μm or more and 50 μm or less, The number of filaments is preferably 50 or more and 100,000 or less, and more preferably 100 or more and 4,000 or less.

  A publicly known water-based epoxy resin or water-dispersed epoxy resin can be used as the epoxy resin applied to the surface and inside of the polyarylate fiber. The epoxy resin is used in the form of a dispersion diluted with an aqueous solvent. In particular, from the viewpoint of environmental management in the production process, it is preferable to use an emulsion type treatment liquid in which an epoxy resin is dispersed in an aqueous solvent in which 50% by weight or more of the solvent is water. In addition to the emulsion containing an epoxy resin, a known curing agent such as an amine is added to the treatment liquid.

  The solid concentration of the treatment liquid used for the treatment of the polyarylate fiber cloth is preferably 1% by weight to 50% by weight, and more preferably 1% by weight to 10% by weight. If the solid content concentration is less than 1% by weight, the effect of improving the adhesive strength may be poor, and if it exceeds 50% by weight, the toughness of the polyarylate fibers may be lost. There is a risk of hindrance.

Examples of the thermosetting resin used in the present embodiment include an epoxy resin, a polyimide resin, an acrylic resin, a bismaleimide resin, a benzocyclobutene resin, a phenol resin, an unsaturated polyester resin, a diallyl phthalate resin, a silicone resin, and a urethane. Examples thereof include resins, polyimide silicone resins, thermosetting polyphenylene ethers, and modified polyphenylene ether (modified PPE) resins. Among these thermosetting resins, selected from the group consisting of epoxy resin, unsaturated polyester resin, phenol resin, acrylic resin, urethane resin, polyimide resin and silicone resin from the viewpoint of temperature characteristics such as heat resistance and electrical insulation It is preferable to use at least one selected from the above, and an epoxy resin is most preferable from the viewpoint of good compatibility with the polyarylate fiber to which the epoxy resin is applied. By using an epoxy resin as the matrix resin, not only the insulating property is increased, but also the adhesive strength at the interface is further improved, and an organic fiber reinforced composite material excellent in strength and insulating performance can be obtained.
These thermosetting resins may be used singly or in combination of two or more, and a polymer alloy composed of a plurality of polymer materials selected from these polymer materials is used. Can be used.

  The form of the insulating member for a gas insulated switch is not particularly limited, and includes a laminated plate, a laminated body, and the like. The shape of the insulating member for the gas insulated switch is not particularly limited, and a known shape can be adopted, for example, a cubic shape, a spherical shape, a cylindrical shape, a plate shape, a film shape, a rod shape, a tube shape, etc. Is mentioned. In addition, the insulating member for gas insulated switches may be incorporated in a part of a certain molded body.

  The method of molding the insulating member for the gas insulated switch is not particularly limited, and an extrusion molding method, an injection molding method, a compression molding method, a transfer molding method, a blow molding method, a vacuum molding method, a rotational molding method, etc. can be applied. It is.

  As described above, the insulating member for a gas-insulated switch according to the present embodiment has high heat resistance, high strength, and high elastic modulus, and is excellent in electrical insulation and hydrogen fluoride gas resistance. It can be suitably used for an insulating operation rod for a switch. In addition, when the insulating member for a gas insulated switch according to the present embodiment is used as an insulating operation rod, a coating for protecting from erosion of hydrogen fluoride gas as in a conventional glass fiber reinforced composite material is unnecessary. is there. In addition, because it is lighter than conventional glass fiber reinforced composite materials, the insulation operating rod located in the drive unit can benefit from it, and can reduce the torque required for driving, saving power, The life of each part can be improved. In particular, the insulating member for a gas-insulated switch according to the present embodiment can be suitably used for an insulating operation rod of a large-sized gas-insulated switch installed in a power plant or a substation.

  FIG. 1 is a schematic view showing an example of a gas insulated switch using an insulating member for a gas insulated switch according to the present embodiment as an insulating operation rod. In FIG. 1, 1 is a gas-insulated switch, 2 is an insulating operation rod, 3 is a piston rod, 4 is a support insulator, 5 is a main circuit terminal, 6 is an internal conductor, 7 is a mount, 8 is a ground terminal, 9 is Finger contacts, 10 a piston, 11 an insulating support cylinder, 12 a hydraulic operation cylinder, 13 a puffer cylinder, 14 a condenser, 15 a shield, and 16 a main tank. The main tank 16 is a sealed container, and the inside thereof is filled with sulfur hexafluoride for insulating the inner conductor 6. The structure is the same as that of a known gas insulated switch except that the insulating member for gas insulated switch according to the present embodiment is adopted for the insulating operation rod 2. FIG. 2 is an enlarged view of a main part of the insulating operation rod shown in FIG. 1, wherein (a) is a perspective view, (b) is a side sectional view, and (c) is a front sectional view.

  As a manufacturing method of the above-described insulating operation rod, after a fiber cloth is wound around a mandrel to form a cylindrical base material, a method of forming by a vacuum impregnation forming method or the like, a method of forming by a filament winding method (FW method), Examples thereof include a method of forming a substrate and then forming it by a vacuum impregnation forming method or the like.

  The inner side of the insulating operation rod 2 is reflected in the surface shape of the metal core used for the molding. By providing a thread on the surface of the core bar in advance, it is possible to provide a mounting portion for connecting the insulating operation rod 2 made of the organic fiber reinforced composite material to be connected to other parts. It is also possible to make a hole in the insulating operation rod 2 made of a molded organic fiber reinforced composite material using an electric drill or the like and screw it to another member using this hole. Therefore, the organic fiber reinforced composite material according to the present embodiment is easily formed into a part such as an insulating rod used in a gas insulation device such as a gas circuit breaker or a gas insulation switch filled with sulfur hexafluoride. Or can be made into a shape that can be attached to other parts. In short, the organic fiber reinforced composite material according to the present embodiment is particularly suitable for a device having a sealed space where hydrogen fluoride gas may be generated or a device having a space for sealing hydrogen fluoride gas. It can be an effective component that does not cause a decrease in surface resistance.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these.
[Example 1]
Polyarylate fiber cloth (Vectran (registered trademark) manufactured by Kuraray Co., Ltd., average moisture content of less than 0.1% (measured under the conditions of 20 ° C. and 65% Rh)), an emulsion-type aqueous epoxy resin using a nonionic emulsifier (JER made by Japan Epoxy Resin Co., Ltd.) and an aqueous epoxy resin curing agent (jER curing agent made by Japan Epoxy Resin) were immersed in a treatment solution adjusted to a solid content concentration of 2% by weight, dried at 100 ° C. for 30 minutes, and then 170 ° C. The epoxy resin was imparted to the fiber surface and inside by heating and curing for 30 minutes. This cloth is wound around a mandrel to form a pipe having an inner diameter of φ20 mm, an outer diameter of φ40 mm and a length of about 300 mm, and then subjected to vacuum pressure impregnation using an epoxy resin to obtain a pipe-like organic fiber reinforced composite material. Produced.

[Comparative Example 1]
A pipe-like organic fiber reinforced composite material was produced in the same manner as in Example 1 except that the epoxy resin was not applied to the fiber surface and inside of the polyarylate fiber cloth.

[Comparative Example 2]
In the same manner as in Example 1 except that a polyarylate fiber cloth pretreated with a silane coupling agent (Shin-Etsu Chemical Co., Ltd. KBE-903) was used instead of the polyarylate fiber cloth provided with an epoxy resin, a pipe shape was used. An organic fiber reinforced composite material was prepared.

[Comparative Example 3]
Instead of polyarylate fiber cloth (Kuraray Co., Ltd. Vectran (registered trademark)), aramid fiber (DuPont Kevlar (registered trademark), average moisture content 4% (measured under the conditions of 20 ° C. and 65% Rh)) A pipe-like organic fiber reinforced composite material was produced in the same manner as in Comparative Example 1 except that.

[Comparative Example 4]
Instead of polyarylate fiber cloth (Kuraray Co., Ltd. Vectran (registered trademark)), aramid fiber (Teijin Techno Products Co., Ltd. Technora (registered trademark), average moisture content of 2% (20 ° C, 65% Rh) A pipe-shaped organic fiber reinforced composite material was produced in the same manner as in Example 1 except that)) was used.

The pipe-like organic fiber reinforced composite material obtained in Example 1 and Comparative Examples 1 to 4 was cut into 5 mm thick slices, evaluated for interfacial peel strength, evaluation of insulation resistance after boiling in salt water, and interface after boiling in salt water. Observations were made. The results are shown in Table 1.
The interface peel strength was evaluated by measuring the strength when the outside of a sample cut into a ring was fixed and extruded with an iron pillar having a constant diameter. The peel strength in Table 1 is shown as a relative value with respect to Comparative Example 1.
The insulation resistance after boiling in salt water was evaluated by immersing the sample in 0.1% by weight salt water for 18 hours. The insulation resistance between the sample cross-sections before and after boiling was measured, and a resistance drop of less than 2 digits was considered good, and a resistance drop of 2 digits or more was judged bad.
In the observation of the interface after boiling with salt water, ink was dropped on the cross section of the sample, the state of ink soaking was observed, and a part with a soaking part was regarded as defective.
These tests are performed in order to confirm the adhesive strength of the interface and the impregnation property of the matrix resin. If the impregnation property of the matrix resin is poor, water penetrates so much and the insulation resistance is remarkably reduced.

  As can be seen from Table 1, the organic fiber reinforced composite material of Example 1 has higher interfacial adhesive strength and excellent matrix resin impregnation properties than the organic fiber reinforced composite materials of Comparative Examples 1 to 4. Was confirmed.

[Example 2]
An epoxy resin was applied to a cylindrical polyarylate fiber cloth (Vectran (registered trademark) manufactured by Kuraray Co., Ltd.) having an outer diameter of 60 mm and a thickness of 10 mm in the same manner as in Example 1, and then vacuum-pressed using the epoxy resin. Impregnation molding was performed to produce an insulating operation rod made of an organic fiber reinforced composite material as shown in FIG.

[Comparative Example 5]
An insulating operation rod was produced in the same manner as in Example 2 except that a cylindrical glass fiber cloth pretreated with a silane coupling agent was used instead of the polyarylate fiber cloth provided with an epoxy resin.

The hydrogen fluoride resistance of the insulating operation rods obtained in Example 2 and Comparative Example 5 was evaluated. The results are shown in Table 2.
The hydrogen fluoride resistance was evaluated by immersing the insulating operation rod in a 0.3% by weight dilute hydrogen fluoride aqueous solution for 2 hours and observing the surface of the insulating operation rod after immersion. Those in which discolored portions were observed on the surface after immersion were regarded as defective, and those in which no discolored portions were observed on the surface after immersion were determined as good.

  As can be seen from Table 2, it was confirmed that the insulating operation rod of Example 2 was excellent in hydrogen fluoride resistance as compared with the insulating operation rod made of the glass fiber reinforced composite material of Comparative Example 5.

  DESCRIPTION OF SYMBOLS 1 Gas insulation switch, 2 Insulation operation rod, 3 Piston rod, 4 Support insulator, 5 Main circuit terminal, 6 Internal conductor, 7 Mount, 8 Grounding terminal, 9 Finger contact, 10 Piston, 11 Insulation support cylinder, 12 Hydraulic pressure Operation cylinder, 13 Puffer cylinder, 14 Condenser, 15 Shield, 16 Main tank.

Claims (4)

  An insulating member for a gas-insulated switch comprising an organic fiber reinforced composite material in which a polyarylate fiber having an epoxy resin applied to the fiber surface and inside the fiber and a thermosetting resin are combined.   The insulating member for a gas-insulated switch according to claim 1, wherein the thermosetting resin is an epoxy resin.   A gas characterized by immersing polyarylate fiber in a dispersion liquid in which an epoxy resin is dispersed in an aqueous solvent, curing the epoxy resin, impregnating the polyarylate fiber with a thermosetting resin, and curing by heating. A method for manufacturing an insulating member for an insulating switch.   A gas insulated switch comprising the insulating member for a gas insulated switch according to claim 1 or 2 as an insulating operation rod.

Images