Silicone resins are highly crosslinked, reticulated polyorganosiloxanes, usually obtained by decomposition with water in the presence of an organic solvent, such as toluene, at a relatively low temperature to give acid hydrolysates, using various mixtures of methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane, diphenyl dichlorosilane, or methylphenyldichlorosilane. The initial product of hydrolysis is a mixture of cyclic, linear and cross-linked polymers, usually also containing a considerable number of hydroxyl groups. The hydrolysate is washed with water to remove the acid, and the neutral initial polycondensate is thermally oxidized in air or further polycondensed in the presence of a catalyst to form a highly crosslinked, three-dimensional network structure.

Curing of silicone resins is usually achieved by silanol condensation to form silicone-oxygen links. When the condensation reaction is in progress, due to the gradual decrease in silanol concentration, increasing the spatial site resistance, poor mobility, resulting in a decrease in the reaction rate. Therefore, in order to make the resin fully cured, it is necessary to accelerate the reaction by heating and adding catalysts. Many substances can play a catalytic role in the silanol condensation reaction, including acids and bases, lead, cobalt, tin, iron and other metals, soluble organic salts, organic compounds, such as dibutyl tin dilaurate or N, N, N', N'a tetramethylguanidine salts and so on.

The performance of the silicone resin's final processed product depends on the number of organic groups contained (i.e., the ratio of R to Si). Generally, the ratio of R to Si in the molecular composition of silicone resins with practical value is between 1.2 and 1.6. The general rule is that the smaller the value of R: Si, the more the silicone resin obtained can be cured at lower temperatures; R: Si the larger the value of the silicone resin obtained in order to make it cured in the 200 - 250 ℃ high temperature for a long time under the baking, the resulting film hardness is poor, but the thermoelasticity is much better than the former.

In addition, the proportion of methyl and phenyl groups in the organic groups also has a great influence on the performance of silicone resin. The lower the phenyl content of organic groups, the softer the film generated, the faster the condensation, the higher the phenyl content, the harder the film generated, the more thermoplastic. Phenyl content between 20 to 60%, the film's bending resistance and heat resistance. In addition, the introduction of phenyl can improve the compatibility of silicone resin with pigment, and also improve the compatibility of silicone resin with other silicone resin and the adhesion of silicone resin to various substrates.