Silicone rubber for sealing two ends of heater

Abstract

The invention discloses silicone rubber for sealing two ends of a heater. The silicone rubber comprises the following raw materials in parts by weight: 1-2 parts of 1,4-cyclohexanedimethanol, 0.4-1 parts of vanadium diboride, 3-4 parts of polypropylene powder, 1-2 parts of accelerant TT, 0.4-1 part of trithiocyanuric acid, 0.7-1 part of 2-mercaptobenzimidazole, 1-2 parts of 1-hydroxycyclohexyl phenyl ketone, 10-17 parts of superfine barium sulfate, 10-13 parts of bis(2-ethylhexyl)sebacate, 2-3 parts of calcium fluoride, 0.5-1 part of butyltin mercaptide, 3-4 parts of rare earth auxiliaries, 100-110 parts of methyl vinyl phenyl siloxane rubber, 1-2 parts of sulfur, and 0.2-0.5 part of tetrahydrofuran, wherein the rare earth auxiliaries are prepared by the following steps: fully melting magnesium-aluminum silicate and colloid formed by polyvinyl acetal under the condition of taking deionized water as a solvent, so as to form stable and high-viscosity colloidal state, adding the treated acidified rare earth into the high-viscosity colloidal state system to form stable rare earth colloidal liquid, and then mixing and modifying with the esterified zeolite. By adopting the rare earth auxiliaries, not only can the mechanical performance and surface resistance of the finished products be effectively improved, but also the compatibility of materials can be enhanced, the stability of the finished products can be improved, the volume wear can be reduced by rare earth, and the wear resistance of the rubber can be improved.

Description

technical field [0001] The invention mainly relates to the field of rubber, in particular to a silicone rubber for sealing both ends of a heater. Background technique [0002] Silicone rubber has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and atmospheric aging resistance. The outstanding performance of silicone rubber is that it can be used in a wide temperature range, which can be used at -60°C (or lower temperature) to +250°C. °C (or higher temperature) for long-term use. However, the mechanical properties of silicone rubber such as tensile strength and tear resistance are poor, and its physical and mechanical properties are not as good as most synthetic rubbers at room temperature. Therefore, silicone rubber is not suitable for use in ordinary conditions. Therefore, adding various additives to silicone rubber to improve its inherent properties can improve its overall quality and improve its applicability in various fields. C...

AI Technical Summary

Problems solved by technology

However, the mechanical properties of silicone rubber such as tensile strength and tear resistance are poor, and its physical and mechanical properties are not as good as most synthetic rubbers at room temperature. Poor, so silicone rubber is not suitable for ordinary conditions, so adding various additives to silicone rubber to improve its inherent properties can improve its overall quality and improve its applicability in various fields