Low-volatile silicone rubber compound and preparation method thereof

Abstract

The invention discloses a low-volatile silicone rubber compound. The low-volatile silicone rubber compound is characterized by comprising the following raw materials in part by weight: 100 parts of raw silicone rubber, 20-70 parts of white carbon black, 1-12 parts of hydroxy silicone oil, 1-10 parts of ethylhydroxy silicone oil, 0.5-8 parts of hydrogen-containing silicone oil and 0.1-1.5 parts of release agent. The invention also discloses a preparation method of the low-volatile silicone rubber compound. The invention has the advantages that: the hydroxy silicone oil and the ethylhydroxy silicone oil are mixed as a structure control agent, so that after vulcanization of the rubber compound, the content of volatiles is low and physical properties are fundamentally changed; and the prepared silicone rubber compound is low in volatile content, good in processing performance and environment-friendly, has better tearing strength on the premise of ensuring good other physical and mechanical properties, and meets requirements of some special products.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a low-volatile silicone rubber compound and its preparation method. Background technique [0002] Silicone rubber is a polymer material with both inorganic and organic properties. The main chain is composed of si-o-si bonds alternately, and the side chains are various organic substituents connected by si-c bonds. It is precisely because of this structure that it has excellent properties such as high and low temperature resistance, weather resistance, ozone resistance, arc resistance, electrical insulation, high air permeability and physiological inertia, and is widely used in modern industries. However, since silicon atoms are mainly connected with methyl groups, its molecular flexibility is large, and the interaction force between molecular chains is weak, resulting in low mechanical properties, especially tear strength, of silicone rubber. However, in the fields of ele...

AI Technical Summary

Problems solved by technology

However, since silicon atoms are mainly connected with methyl groups, its molecular flexibility is large, and the interaction force between molecular chains is weak, resulting in low mechanical properties, especially tear strength, of silicone rubber.

However, in the fields of electronics, aviation, food, and hygiene, a large number of silicone rubber products are small parts with complex structures, resulting in poor tear resistance of vulcanized products, and the products are easily torn during the thermal mold opening process; and some are used for contact. Silicone rubber products such as food sheets, rings, and tubes also require low volatile content of silicone rubber after vulcanization, but the silicone rubber compound prepared by the existing technology has a high volatile content, which limits the application range of silicone rubber. Therefore, On the basis of how to effectively improve the strength of silicone rubber, reducing the volatile content of silicone rubber after vulcanization has become the key to the development of silicone rubber materials and products, which has great practical significance

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