Silicone adhesives include two categories: adhesives (including sealants) based on silicone resin or silicone elastomer.
Silicone resin is composed of a spatial network structure with Si-o-Si as the main chain. It is a cross-linked semi-inorganic polymer with organic groups connected to the silicon atoms. It can be further condensed at high temperatures into a highly cross-linked and hard and Brittle resin.


Silicone rubber is a linear polysiloxane with Si-O-si as the main chain (molecular weight ranging from tens of thousands to hundreds of thousands). It forms several cross-linking points under the action of curing agent and catalyst. Elastomer, silicone rubber mainly composed of polydimethylsiloxane, also called silicone rubber.

The former is mainly used for bonding metals and heat-resistant non-metallic materials. The resulting bonded parts can be used in a temperature range of 60 to 250°C. The latter is mainly used for bonding heat-resistant rubber, rubber and metal and other non-metallic materials. , generally can be used at -60~200℃.

Silicone adhesives can be roughly divided into pure silicone adhesives and modified silicone adhesives. Pure silicone organic adhesives are mainly composed of active polysiloxane (hydroxyl-terminated silicone rubber, hydrogen-containing or vinyl silicone oil), curing agent, catalyst, filler and additives.

According to the difference in curing reaction, it can be divided into condensation type, free radical initiated type and hydrosilylation type; according to the different composition and function, it can be divided into one-component silica gel, two-component silica gel and silicone pressure-sensitive adhesive.

Silicone adhesives have many superior properties due to their own molecular structure, including cold resistance, heat resistance, aging resistance, water resistance, moisture resistance, high stretch fatigue strength, small permanent deformation, and non-toxicity. In recent years, this type of adhesive has developed rapidly in China. It has been widely used in electronic appliances, aerospace, construction industry and other fields.


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