At present, the main ways to modify epoxy resin with organosilicate include: active end group reaction, generation of block copolymers with siloxane coupling agent, substitution of part of side groups of siloxane, preparation of siloxane particles in advance, etc. These modification ways can be divided into physical blending and graft copolymerization according to the reaction mechanism.
  Physical blending modification
The polymer obtained by mechanical blending method, silicone and epoxy resin two phases of the interaction force is poor, often used to increase the transition phase (compatibilizer), adding coupling agent method to improve the compatibility of silicone and epoxy.
The copolymerization modification
Copolymerization modification is the use of organic silicon on the reactive end groups such as hydroxyl, carboxyl, amino, vinyl, end alkoxy with epoxy groups of epoxy resin, hydroxy reaction, generate graft or block copolymer, to solve the problem of compatibility, and introduced in the solidification structure of stability and flexibility of Si - O key, improve the fracture toughness of epoxy resin. Siloxane containing alkoxy group or hydroxyl group reacts with epoxy resin to produce polysiloxane modified epoxy resin by grafting or block copolymerization.