Liquid silicone rubber uses low-viscosity polysiloxane as the base polymer. It can be vulcanized at room temperature or slightly heated by mixing with moisture or cross-linking agent without using complex mixing and molding equipment. Elastomer. According to the crosslinking mechanism, it can be divided into condensation type liquid silicone rubber and addition type liquid silicone rubber.

Some people use room temperature vulcanization and high temperature vulcanization to distinguish condensation type liquid silicone rubber from addition type liquid silicone rubber. In fact, the condensation type liquid silicone rubber has a higher temperature and humidity, and the vulcanization speed is accelerated; the addition type liquid silicone rubber can also be cured in the greenhouse. The biggest difference between the two is that the condensed liquid silicone rubber has small molecules released during vulcanization, while the addition type liquid silicone rubber does not. Condensation type liquid silicone rubber is based on hydroxyl terminated polydimethylsiloxane. The addition type liquid silicone rubber is based on vinyl-terminated polydimethylsiloxane, which is cured by addition reaction of silicon-hydrogen bond and vinyl double bond in the presence of platinum catalyst.

 

Due to the difference in reaction mechanism and performance, the two are also quite different in use.

Condensed liquid silicone rubber
It has excellent electrical properties and chemical stability, water resistance, ozone resistance, weathering resistance, simple usage, and strong process applicability. It is widely used in: Construction glue: including doors and windows. Building gap sealant, weather-resistant glue for glass curtain wall, structural glue, highway gap sealant, etc.; Mould glue: mainly used for mould design and model manufacturing Electronic potting glue: mainly used for insulation, moisture-proof, waterproof and fixing of electronic accessories , widely used in general electrical module potting and as a potting protection material outside the LED display. Pad-free glue, etc.


Addition type liquid silicone rubber
It has the advantages of excellent electrical insulation performance, aging resistance, high mechanical strength, good elasticity, fast and convenient molding, no by-products in the reaction, non-toxic and tasteless, wide operating temperature, safe and hygienic, and strong product extensibility. Products of different shapes and uses can be used for: encapsulation or potting of electronic components and electrical equipment; manufacturing of high-voltage electrical products, such as insulators, arresters, insulating jackets of transformers, terminal connectors of wires and cables, etc.; medical materials, made of Artificial gills, artificial lungs, artificial lenses, etc.; dental printing materials, reproduction of cultural relics and handicraft materials; fruits and vegetables insurance modified atmosphere film, etc.

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