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Room temperature vulcanized silicone rubber as an adhesive

08 Apr 2020

Room temperature vulcanized silicone rubber (RTV) is a new type of silicone rubber that came out in the 1960s. Its most notable feature is that it can be cured in place without heating and pressure at room temperature. It is extremely convenient to use. It quickly became an important part of the entire silicone rubber product. At present, room temperature vulcanized silicone rubber has been widely used as an adhesive.

Silicone rubber adhesive The most adhesive is an adhesive made of silicone rubber. Because RTV silicone rubber has a low molecular weight, it is called liquid silicone rubber. Its physical form is usually a flowing fluid or viscous paste with a viscosity between 100 and 1000 cm. RTV silicone rubber is based on hydroxyl-terminated polysiloxane as a base material and can be divided into single-component and two-component. Single-component room temperature vulcanized silicone rubber has good adhesion to most substrates, which can be in the range of -60≤200 Long-term use within the temperature range of ℃, has excellent electrical insulation and chemical stability, and has good adhesion to various metallic and non-metallic materials. It is mainly used to coat various electronic components and electrical equipment, including insulation, moisture-proof, shock-proof, etc. It can also be used as sealing material and elastic adhesive.

The proportions of two-component room temperature vulcanized silicone rubber are different, and vulcanized products of various specifications can be prepared, and deep vulcanization can also be carried out. However, due to its poor adhesion to the substrate, it is mainly used for insulation, packaging, joints, sealing, moisture-proof, roll-making and other materials in electronic appliances, automobiles, machinery, construction and other industries.

The strength of silicone rubber itself and its low bonding strength to various materials limit the scope of application of silicone rubber. At present, the research of RTV silicone rubber adhesive strengthening modification mainly includes crosslinking agent, polysiloxane physical and chemical strengthening modification and adhesive surface modification to improve its bonding performance.

crosslinking agent

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