The monomer of silicone resin is chlorosilane, which can be alcoholysis to obtain the corresponding alkoxy silane. They are widely used monomer components due to their non-corrosive properties and greater hydrolytic stability, easy preservation and separation than the corresponding chlorosilane. By changing the number of functional groups in monomers and choosing different substituents, polymers with different degree of polymerization, branching and cross-linking can be prepared, and products with different properties can be obtained to adapt to different uses. The number of functional groups in the monomer can be expressed by the ratio of R to Si of the monomer mixture, R/Si (R is the substitution base order, Si is the number of silicon atoms). Take the hydrolytic condensation of methyl chlorosilane as an example: when R/Si> At 2, that is, (CH3) 2SiCl2 and (CH3) 3SiCl mixed co-hydrolysis, the formation of lower molecular weight oily polymer, that is, silicone oil. When R/Si=2, that is, pure (CH3) 2SiCl2 hydrolyzed condensation, the generation of high molecular weight linear polymer is said behind the silicone rubber adhesive base material, also known as silicone rubber. When R/Si< 2, that is, (CH3) 2SiCl2,CH3SiCl3 co-hydrolysis. Or CH3SiCl3,(CH3)2SiCl2 and SiCl4 co-hydrolyzed polycondensation, the formation of polymer network structure, that is, silicone resin, appropriate change of R/Si value, can get different properties of silicon containing polymers. R/Si is small, that is, when the proportion of three functional or four functional silicon - oxygen units is high, after curing, the crosslinking degree is high, the silicone resin is hard and brittle; And R/Si is large, that is, the ratio of bifocal silicon - oxane unit is high, the flexibility of cured silicone resin is good, usually used between 1.2-1.5 R/Si.