Process for producing resin composition with partial-discharge resistance, resin composition with partial-discharge resistance, and insulating material with partial-discharge resistance

Abstract

A resin composition having excellent partial-discharge resistance and a low density is produced by a simple process. An organic compound is inserted between sheets of a lamellar clay mineral by an ion exchange treatment to thereby impart to the lamellar clay mineral the property of swelling in at least either of polar solvents and nonpolar solvents. The lamellar clay mineral having the swelling property imparted thereto is swelled in a swelling solvent comprising a polar solvent or nonpolar solvent. An epoxy rein is then mixed therewith, and the mixture is kneaded. The swelling solvent is removed from the resultant mixture comprising the epoxy resin, lamellar clay mineral, and swelling solvent. An epoxy resin hardener is added to and mixed with the resultant mixture comprising the epoxy resin and the lamellar clay mineral. Thus, a resin composition having partial-discharge resistance is produced. Also provided is an insulating material having partial-discharge resistance which comprises a cured object formed from the composition. The insulating material is composed of an epoxy resin having a three-dimensional network structure and inorganic nanoparticles (2) made of the lamellar clay mineral which are densely and evenly dispersed in molecular chains (1) of the resin.

Description

technical field [0001] The present invention relates to a method for producing a partial discharge-resistant resin composition used in high-voltage equipment such as generators, rotating electrical machines, power transmission and transformation equipment, and power receiving and distribution equipment, a partial discharge-resistant resin composition, and partial discharge resistance Insulation Materials. Background technique [0002] Insulating coils incorporated in generators, rotating electrical machines, etc. are provided with insulating layers for blocking the conduction between conductors and between conductors and the ground. In addition, in power transmission and transformation equipment such as sulfur hexafluoride gas insulated switchgear and pipeline gas power transmission equipment, cast members are used as insulating members for insulating and supporting high-voltage conductors in metal containers, for example. An insulating resin material based on epoxy resin i...

AI Technical Summary

Problems solved by technology

[0005] However, in the insulating layer of the above-mentioned insulating coil, the impregnated epoxy resin itself has low resistance to partial discharge deterioration, so the epoxy resin is selectively degraded, and the insulating layer as a whole also gradually deteriorates.

In addition, since the insulating spacer is filled with several times as many inorganic particles as the epoxy resin, the density of the insulating material becomes high, making it difficult to reduce the weight of high-voltage equipment

Furthermore, in the method of precipitating silica particles using a sol-gel reaction, it is necessary to control the sol-gel reaction to deposit uniform particles, so the manufacturing process and manufacturing equipment become complicated and the cost becomes high.

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