Different Properties of Organic Silicone Resin
May 7, 2024
The type of organic group R on the silicon atom in silicone resin, as well as the ratio of methyl to phenyl-1 groups in the organic group, also have a significant impact on the performance of silicone resin. Different organic groups will endow silicone resin with different properties:
When the organic group is phenyl, silicone resin is endowed with oxidation stability, which can destroy the crystallinity of the polymer within a certain range; The lower the phenyl content in the organic group, the softer the generated paint film and the faster the condensation; The higher the phenyl content, the harder the generated paint film and the more thermoplastic it is. The benzene content is between 20% and 60%, and the paint film has the best bending resistance and heat resistance.
When the organic group is methyl, it can endow silicone resin with thermal stability, demolding ability, hydrophobicity, and arc resistance;
In addition, the introduction of benzene can improve the compatibility between silicone resin and pigments, as well as the compatibility between silicone resin and other organic silicone resins and the adhesion of silicone resin to various substrates. Different organic groups and quantities can be introduced during the preparation of silicone resin according to the needs of product performance.
When the organic group is vinyl, it can improve the curing characteristics of silicone resin and endow it with coupling properties; When the organic group is tetraoxphenyl, the lubricity of the polymer can be improved;
When the organic group is phenylethyl, it can improve the blending properties of silicone resin and organic compounds;
When the organic group is aminopropyl, the water solubility of the polymer can be improved while endowing it with coupling properties; When the organic group is amyl, it can improve the hydrophobicity of silicone resin.
The typical organic groups carried by silicone resin are mainly methyl and phenyl, and the ratio of methyl and phenyl groups in the organic groups also has a significant impact on the performance of silicone resin.The lower the phenyl content in the organic group [i.e. Ph/(Me+Ph)], the faster the condensation reaction, and the softer the resulting paint film; The higher the phenyl content, the harder the generated paint film and the greater its thermoplastic properties; The benzene content is between 20% and 60%, and the paint film has the best bending resistance and heat resistance.
In addition, the introduction of benzene can improve the compatibility between silicone resin and pigments, as well as the compatibility between silicone resin and other organic silicone resins and the adhesion of silicone resin to various substrates.Therefore, when manufacturing silicone resins with various uses and properties, it is necessary to first consider which monomers to choose, introducing different organic groups on silicon atoms, and how to determine their mix proportions.
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