A kind of high-performance anti-tracking silicon rubber and preparation method thereof

Abstract

The invention discloses a high-performance anti-tracking silicone rubber and a preparation method thereof. In parts by mass, the raw material composition of the anti-tracking silicone rubber is: 100 parts of methyl vinyl silicone rubber, 20-45 parts of fumed silica, 4-15 parts of hydroxyl silicone oil, 0.3-1 part of hydrogen-containing silicone oil, 0.5-5 parts of nitrogen-containing silane, 0.1-2 parts of platinum compound and 0.5-4 parts of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane. During preparation, mix methyl vinyl silicone rubber, fumed silica, hydroxyl silicone oil, and hydrogen-containing silicone oil in a kneader at room temperature, and heat-treat to obtain a silicone rubber base rubber; mix the base rubber and other components of the formula Mix evenly on the open mill, and then vulcanize in stages. The silicone rubber of the invention has excellent tracking resistance and mechanical properties, and can be applied in the field of high-voltage insulation; and the raw materials are easy to obtain, the processing technology is simple, and it is convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of polymer insulating materials, in particular to the field of silicone rubber insulating materials, in particular to a high-performance tracking-resistant silicone rubber and a preparation method thereof. technical background [0002] The development of industry and society promotes the continuous updating of insulating materials. In the early days, the insulating materials used in high-voltage environments were almost all inorganic materials such as ceramics and glass. Although ceramic and glass insulating materials have good electrical properties and long-term operating experience, they have disadvantages such as fragility, non-pollution resistance, high production costs, and complicated processes. The emergence of organic polymer insulating materials has solved the above problems well. Compared with ceramics and glass, the unique performance characteristics of polymer materials, such as small mass, low cost, hyd...

AI Technical Summary

Problems solved by technology

Chinese invention patent application CN104130580A uses various inorganic fillers such as aluminum hydroxide, zinc borate, and aluminum oxide to compound and fill a silicone rubber that is resistant to tracking. However, due to the large amount of filler added and poor compatibility, Deteriorated processability and mechanical properties

Lars E.Schmidt reported that the compound filling of melamine cyanurate and white carbon black can also significantly improve the tracking resistance and flame retardancy of silicone rubber, but there are also problems of poor compatibility and deterioration of mechanical properties (Tracking and erosion resistance of high temperature vulcanizing ATH-freesilicone rubber, IEEE Transactions on Dielectric and Electrical Insulation, 2010,17(2):533-540)

Chinese invention patent application CN103642247A uses polymetallic organosiloxane, silane-treated aluminum hydroxide, nano-tin dioxide, etc. to improve the compatibility and tracking resistance of silicone rubber systems, and prepares a high-temperature resistant insulating silicone rubber. However, there are disadvantages such as large amount of filler added and complicated process.

[0004] To sum up, some progress has been made in the current anti-tracking silicone rubber, but the existing preparation methods still have shortcomings: the addition of anti-tracking additives often requires a large amount (>50wt%) to achieve a satisfactory The tracking resistance effect seriously damages the processing performance and mechanical properties of silicone rubber

This not only greatly limits the application range of silicone rubber insulating materials, but also affects the protective performance of silicone rubber products in long-term operation, and there are certain safety hazards

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