Room temperature vulcanized fluorosilicone rubber and preparation method thereof

Abstract

The invention relates to a room temperature vulcanized fluorosilicone rubber and a preparation method thereof. The room temperature vulcanized fluorosilicone rubber is prepared from the following raw materials by weight: 100 parts of base rubber, 5-10 parts of cross-linking agent, 1-10 parts of base material tackifier, 0.05-1 part of catalyst, colloid 30-100 parts of reinforcing agent; the base glue is alkoxy-terminated fluorine-containing polysiloxane; and the cross-linking agent is fluoroalkyl alkoxysilane. Compared with the traditional dealcoholized RTV silicone rubber, the room temperature vulcanized fluorosilicone rubber prepared by the invention has greatly improved oil resistance and antifouling performance, adhesion performance and storage performance, and at the same time has good processing performance.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to room temperature vulcanized fluorosilicone rubber and a preparation method thereof. Background technique [0002] With the rapid development of electronic products, they are constantly favored by people and widely used in people's daily life. The demand for electronic products in the market is also increasing, and the performance requirements of electronic products are also getting higher and higher. For example, in the field of high-end electronic appliances, more and more attention has been paid to the effective protection of PCB electronic circuit boards. In order to prevent all kinds of moisture and mold from invading the circuit board, the RTV silicone rubber coated with some components on the electronic circuit board is required to be environmentally friendly, oil-resistant, solvent-resistant, waterproof, corrosion-resistant, have a certain self-cleaning performance, and at ...

AI Technical Summary

Problems solved by technology

In the preparation process, after the catalyst is added, there will be a short cross-linking process that will cause the viscosity of the system to rise sharply or even gel, which is usually called "viscosity peak". It needs high-speed shearing and standing for a period of time to reduce the viscosity. However, high-speed stirring will cause the temperature of the colloid to rise, which will seriously cause the rubber to be cross-linked and scrapped, which will cause difficulties in the regulation of production.

At the same time, due to the high activity of hydroxyl groups in α, ω-dihydroxypolydimethylsiloxane, the prepared silicone sealant has high activity. During storage, there will be a small amount of reaction between silicon hydroxyl groups and silanes. The alcohol is released, and under the action of the catalyst, it will react with the base rubber to form a very low activity mono-alkoxy-terminated polymer, which cannot be further cross-linked and cured, which will affect the storage stability of the product.

[0004] Moreover, the currently commonly used α, ω-dihydroxy polysiloxane (107 silicone oil) is used as the base rubber, and the RTV silicone rubber prepared has the temperature resistance, electrical insulation and flexibility of ordinary silicone rubber, but with the The continuous development of industrial technology has gradually exposed its shortcomings of poor oil resistance, solvent resistance and antifouling performance, which cannot meet the performance requirements of some special and harsh environments and high-end electronic fields on the market, such as chemical industry, military industry, marine and other fields

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