1. Preparation of MQ-type silicone resins
MQ-type silicone resins
are commonly prepared by sol-gel methods. The main raw material of the M chain is hexamethyldisiloxane (MM) or trimethylchlorosilane. The raw material of the Q chain is mainly water glass (sodium silicate) or tetraethyl orthosilicate (TEOS). Due to the difference in raw materials of Q chain, it is mainly divided into tetraethyl orthosilicate method and water glass method. The product prepared from ethyl orthosilicate has better performance, but the cost is higher, which limits its application range. The water glass method is cheap and easy to obtain, and the product performance is also good, which has a large market value.
2. Application of silicone MQ resins in pressure sensitive adhesive
Silicone pressure sensitive adhesives
are a special type of adhesive consisting of silicone (usually MQ silicone resin
), silicone rubber, catalysts, crosslinkers and other additives. Silicone pressure sensitive adhesives mainly include solvent type, high solid content type, solventless type, emulsion type, radiation curing type, resin modified type, biodegradable type and functional type.