Silicone rubber for composite insulator and preparation method thereof

Abstract

The invention discloses a silicone rubber for a composite insulator, wherein the silicone rubber comprises the following raw materials in parts by weight: 30-50 parts of methyl vinyl silicone rubber A, 50-70 parts of methyl vinyl silicone rubber B, 25-50 parts of fumed silica, 100-130 parts of aluminium hydroxide, 1-6 parts of silane coupling agent, 0.2-2 parts of ultraviolet absorber, 2-6 parts of zinc oxide, 0.5-3 parts of triethanolamine, 0.2-1 parts of stearic acid, 0.5-2 parts of hydrogen-containing silicone oil, 0.2-1 parts of vinyl silicone oil, 0.5-3 parts of color masterbatch rubber, 2-6 parts of hydroxyl silicone oil and 0.5-1 parts of vulcanizing agent. The silicone rubber provided by the invention can achieve the following performances: the tensile strength is larger than 4 MPa; the breaking elongation is larger than 350%; the peel strength is larger than or equal to 12 KN.m<-1>; the shore hardness is 60+ / -5 degrees; the thermal aging tensile strength retention is larger than or equal to 90%; the anti-creep track passes a grade of 1A4.5; the flame retardance reaches a grade of FV-0; the average static contact angle is larger than 105 degrees; the electrical surface resistivity is larger than 2*10<15> omega; the dielectric constant is smaller than 3.8; and the dielectric loss angle tangent is smaller than 0.01.

Description

technical field [0001] The invention relates to a silicone rubber for composite insulators and a preparation method of the silicone rubber. Background technique [0002] Composite insulators are composed of glass fiber composite core rods or hollow pipes and silicone rubber sheds. Compared with traditional ceramic insulators and glass insulators, composite insulators have the advantages of light weight, strong pollution flashover resistance, and simple manufacturing process. In recent years, it has developed very rapidly in our country. The silicone rubber shed is on the outside of the composite insulator mandrel or hollow pipe, which can withstand high electric field, withstand the harsh outdoor natural environment (including ultraviolet radiation, salt spray, sand and dust, high and low temperature changes, etc.) while protecting the inner mandrel or hollow pipe Therefore, the silicone rubber material used in the umbrella skirt is required to have good tracking resistance...

AI Technical Summary

Problems solved by technology

With the development of voltage level and technology, the existing silicone rubber materials can no longer meet the requirements of technological development. The electrical erosion ability and flame retardancy of rubber, but its water repellency and mechanical strength are significantly reduced, which cannot meet the current requirements for comprehensive and balanced improvement of silicone rubber properties.