Silicone rubber for composite insulator and preparation method of silicone rubber

Abstract

The invention discloses silicone rubber for a composite insulator. The silicone rubber is prepared from the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 35 to 40parts of white carbon black, 115 to 125 parts of aluminum hydroxide, 4 to 6 parts of hydroxyl silicone oil, 3 to 5 parts of a silane coupling agent and 0.5 to 1.5 parts of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane. Meanwhile, the invention also discloses a preparation method of the silicone rubber for the composite insulator. The silicone rubber and the preparation method thereof disclosed by the invention have the following advantages: firstly, the silicone rubber for the composite insulator has good electrical erosion resistance and can reach 1A 4.5 level; secondly, the silicone rubberfor the composite insulator has high nitric acid resistance and can meet the requirements of long-term outdoor use of a silicone rubber composite insulator; thirdly, the preparation method of the silicone rubber for the composite insulator has the advantages of lower production cost, easiness in quality control, no toxicity or odor at room temperature, high mechanical properties, capabilities ofbeing processed into a variety of injection products and molded products and suitability for large-scale production.

Description

【Technical field】 [0001] The invention relates to a silicone rubber for composite insulators and a preparation method thereof, belonging to the technical field of insulating materials. 【Background technique】 [0002] Silicone rubber has outstanding characteristics of electrical insulation, high and low temperature resistance, weather resistance and hydrophobic migration, and is now widely used in the field of high-voltage and ultra-high-voltage power transmission and transformation technologies. With the continuous improvement of the operating voltage level of power equipment and the increasing environmental pollution of atmospheric smog, people have put forward higher requirements for the operation safety and reliability of silicone rubber insulating materials under extreme working conditions. [0003] In recent years, in the published Chinese patent literature, there have been some patents on silicone rubber materials for flame-retardant composite insulators. Chinese pate...

AI Technical Summary

Problems solved by technology

The silicone rubber prepared by this invention has excellent ultraviolet resistance and acid corrosion resistance. The silicone rubber sample is soaked in 65% nitric acid solution for 45 minutes, and the material is intact, but the nano-scale aluminum hydroxide micropowder used in this invention is expensive. And the untreated surface has poor compatibility with the methyl vinyl silicone rubber base material, it is difficult to mix evenly, and the mechanical properties of the obtained high-temperature vulcanized modified silicone rubber are poor

[0006] To sum up, some progress has been made on silicone rubber materials for composite insulators, but there are still some shortcomings such as high raw material cost, complicated preparation process, low leakage resistance level and poor nitric acid resistance.

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