A non-drying waterproof sealant with high voltage resistance and insulation

Abstract

A non-drying waterproof sealant for high-voltage insulation, which is composed of 50-100 parts by weight of polyisobutylene, 20-60 parts of plasticizer, 5-20 parts of hydrophobic fumed silica, and 50-200 parts of inorganic Filler, 0.5-10 parts polybutadiene polyurethane modified alkyl silicone oil, 20-50 parts resin-modified hollow glass microspheres. Using polyisobutylene as the base material improves the non-drying and adhesion of the sealant; adding polybutadiene polyurethane modified alkyl silicone oil improves the hydrophobicity; adding resin-modified hollow glass microspheres improves the dispersion and enhances the High voltage insulation. The invention is used for filling and sealing of structural voids such as pin-type polyolefin insulators for high-voltage transmission lines.

Description

technical field [0001] The invention belongs to the technical field of sealants, in particular to a non-drying sealant with high voltage resistance and insulation. Background technique [0002] Non-drying sealant is mainly prepared by main resin, plasticizer, functional filler, tackifier, etc. in different proportions. Adjusting the type and proportion of additives makes the performance of the sealant different. For example, the invention patent application (CN102702996A ) discloses a non-drying anti-corrosion sealant with drying ability, the main components include: butyl rubber, polyisobutylene, water absorbing agent, corrosion inhibitor, adhesion promoter, etc. The construction performance of the non-drying sealant, adding a water-absorbing agent to improve the drying ability and corrosion resistance of the product, etc. The invention patent application (CN110819011A) discloses an EPDM insulating compound to improve the smoothness and cohesiveness of the bonding surface ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are structural gaps in some insulators used in high-voltage transmission lines, such as pin-type polyolefin insulators that have been widely used in 6-35kV transmission lines. Before installing the steel feet, fill the sealant into the top of the shed, otherwise it will cause water vapor to enter, or corona will be generated in the gap when the line is running at high voltage, which will affect the actual operation safety of the insulator

However, the existing sealant technology cannot meet the requirements: (1) For the non-drying sealant, the hydrophobicity of the prior art is not strong, and the high-voltage insulation is not enough. It is used for polyolefin insulators, and it will be used at 100-150kV. breakdown; (2) For the insulating sealant, the existing technology needs to be vulcanized or cured into an elastomer, which cannot be used immediately at the insulator installation site, or cannot be removed after vulcanization and bonding of the shed. not feasible