High temperature resistant silicon rubber and preparation method thereof

Abstract

The invention provides a silicon rubber, particularly relates to a high temperature resistant silicon sulfide rubber and belongs to the technical field of polymer materials. The high temperature resistant silicon rubber comprises the following constituents in parts by weight: 50-80 parts of vinyl silicon rubber, 5-10 parts of ethyl orthosilicate, 3-5 parts of thermosetting phenol resin, 10-15 parts of polyvinyl chloride resin, 5-10 parts of tri-n-butyl citrate, 5-8 parts of white carbon black, 3-5 parts of calcium carbonate, 5-8 parts of talcum powder, 2-4 parts of iron trioxide, 2-4 parts of magnesium oxide, 3-4 parts of zinc oxide, 2-3 parts of aluminum oxide, 5-10 parts of hydroxyl silicone oil, 3-6 parts of zinc stearate, 4-6 parts of coupling agent, 3-6 parts of cross-linking agent, 4-8 parts of vulcanizing agent and 3-7 parts of anti-aging agent. The silicon rubber provided by the invention has better mechanical property and high temperature resistance, the hardness can be more than 70HA, the tensile strength can be more than 9.5MPa, the elongation can be more than 420%, and the thermal decomposition temperature can be more than 450 DEG C.

Description

technical field [0001] The invention provides a silicone rubber, in particular relates to a high-temperature-resistant vulcanized silicone rubber, which belongs to the technical field of polymer materials. Background technique [0002] Silicone rubber is a polymer elastomer with both inorganic and organic properties. Its molecular chain is composed of silicon atoms and oxygen atoms alternately. 240KJ / mol is much larger. Silicone rubber was developed in the 1940s, and the earliest researched variety abroad was dimethyl silicone rubber. Around 1944, it was put into production by DowCorning and General Electric in the United States. my country successfully researched and put it into industrialized production in the early 1960s. It has excellent properties such as high and low temperature resistance, radiation resistance, ultraviolet resistance, insulation, water repellency, good weather resistance, good air permeability and low compression deformation rate. It is a variety w...

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Problems solved by technology

[0005] Compared with most elastomers, silicone rubber can withstand a wider range of humidity, such as -60 ° C to 240 ° C, but the general working temperature of vulcanized rubber is 200 ° C, and when the working temperature is increased, the mechanical properties of the rubber will appear. Performance degradation problems, such as: cracking, shrinkage, softening, etc., affect the normal operation of the workpiece

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