Preparation method of silicone rubber with polar functional groups

Abstract

The invention discloses a preparation method of silicone rubber with polar functional groups. The preparation method comprises the following steps: 1) uniformly mixing a component A, a component B, a component C and a component D, wherein the component A is 100 parts by mass of organic hydrogen polysiloxane, the component B is 0.01-0.2 part by mass of a catalyst, the catalyst is a non-metal catalyst, the component C is 0.5-5 parts by mass of a cross-linking agent, the cross-linking agent is a diketone compound, and the component D is 0.1-1 part by mass of a functional monomer; and 2) carrying out a heating curing reaction on the mixture obtained in the step 1) to obtain the silicone rubber, wherein the temperature of the heating curing reaction is 10-100 DEG C. According to the method, a noble metal catalyst is not used, and the price is low; requirements on experimental conditions are not harsh, and a catalyst poisoning phenomenon is not easy to occur; a prepared product is not prone to yellowing and is colorless and transparent; and monoketone with functional groups is added to react with Si-H to synthesize the silicone rubber with polar functional groups, so that the problem of low polarity of the silicone rubber is solved, and the application range of the silicone rubber is widened.

Description

technical field [0001] The invention relates to a method for preparing silicone rubber, in particular to a method for preparing silicone rubber by using a non-metallic compound as a catalyst. Background technique [0002] Silicone rubber has excellent physical properties such as heat resistance, cold resistance, electrical insulation, and compression set. At present, silicone rubber compositions (also called liquid silicone rubber) include raw rubber, precious metal catalysts and crosslinking agents. Raw rubber is generally prepared into silicone rubber by hydrosilation reaction under the action of platinum, rhodium, palladium and other precious metal catalysts. However, the noble metal catalyst used in the hydrosilylation reaction has very high catalytic activity and can catalyze the hydrosilylation reaction at room temperature. Therefore, it is generally necessary to add a curing retarder during the reaction to make it stable at room temperature, and the reaction can onl...

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Problems solved by technology

[0003] At present, the curing retarders commonly used in the industry often need to be added in a relatively large amount to achieve a better inhibitory effect, which leads to an increase in the curing time of the silicone rubber composition and poor controllability

Moreover, when some temperature-sensitive device packages are used, such as when the curing temperature is required to be lower than 100°C, or even lower than 80°C, the operating time is longer

[0004] In addition, the disadvantages of metal catalysts are as follows: (1) expensive; (2) the platinum catalyst used in addition-type two-component room temperature vulcanized silicone rubber is extremely active, and it is easy to react with some other substances and lose its activity. Exposure to certain substances may invalidate the catalyst and cause the silicone rubber not to cure. We call this phenomenon "catalyst poisoning"

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