Condensed type room temperature vulcanization heat insulation silicone rubber and preparation method thereof

Abstract

The invention discloses condensed type room-temperature vulcanized heat-insulating silicone rubber which comprises a component A and a component B. The component A comprises the following components in parts by mass: 45-60 parts of hydroxyl-terminated polyorganosiloxane; 10 to 15 parts of a reinforcing agent; 1 to 3 parts of a tackifier; 15-25 parts of a heat insulation filler; 8 to 12 parts of heat-resistant resin; 15-25 parts of a dispersant; the component B is prepared from the following component in parts by mass: 8 to 12 parts of ethyl orthosilicate; 2 to 4 parts of n-butyl borate; and 1 to 3 parts of dibutyltin dilaurate. The heat conductivity coefficient of the condensed type room-temperature vulcanized heat-insulating silicone rubber can reach 0.14 (W / mk) or below in a high-elasticity state, and meanwhile, the problems that filler is gathered and caked and cannot be used due to long-time storage are solved.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a condensation-type room temperature vulcanized heat-insulating silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is a linear polyorganosiloxane-based polymer, adding crosslinking agent, reinforcing agent and other compounding agents, compounded and vulcanized to form an elastomer. It can be used in a wide range from -100°C to 315°C. At the same time, it is characterized by weather resistance and can be used outdoors for 100-150 years. These excellent properties make it widely used in various fields. [0003] Condensed two-component room temperature vulcanized silicone rubber in silicone rubber, because it can be vulcanized at room temperature and does not exotherm or absorb heat, has small shrinkage, self-leveling and thixotropy during vulcanization, and generally does not need large-scale processing equipment when used. It ...

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Problems solved by technology

[0004] However, at present, ordinary condensation-type silicone rubber, at high temperature (>100°C), the bonding strength with the substrate will decrease, and it will even fall off from the substrate if it is in this environment for a long time. At the same time, the cured elastomer will Gradually lose elasticity, pulverize, and the internal parts wrapped by silicone rubber will also appear to be overheated

[0005] In order to meet certain performance requirements and reduce costs, the condensation silicone rubber currently on the market often adds some high-density fillers, such as alumina, magnesium hydroxide, etc., while the density of polysiloxane is only 0.96g / cm 3 , causing the filler to gather at the bottom, and the silicone oil, base material, and solvent to precipitate on the top. It needs to be stirred before use after short-term storage, which affects the use efficiency. After long-term storage, the filler aggregates and agglomerates, making it unusable

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