Silicone resin with Si-O-Si as the main chain, silicon atoms linked with organic groups, with a high degree of crosslinking semi-inorganic polymer, it is made of polysilane polyfunctional groups hydrolyzed silicone resin prepolymer, prepolymer in heating or catalyst catalysis further crosslinking into a three-dimensional network structure of insoluble, non-melting solid silicone resin. It can be a homopolymer of a monomer or a copolymer of multiple monomers.
Silicone resin has the characteristics of organic silicone resin and inorganic materials, and has excellent heat resistance, electrical insulation, hydrophobicity, weather resistance and chemical resistance properties, has a wide range of applications in many industries, especially in aerospace, construction, national defense and other fields and departments. Silicone resins are classified in a number of ways. If divided according to the main chain composition, can be divided into pure silicone resin and modified silicone resin two kinds, the former is a typical polysiloxane structure, according to the type of organic substituents connected on the silicon atom can be subdivided into methyl silicone resin, phenyl silicone resin and methyl phenyl silicone resin; Modified silicone resins are thermosetting polysiloxane hybrids of organic resins, or polysiloxane modified with other siloxanes and carbon functional silanes. 1, organic silicon organic silicon, that is, organic silicon compound, refers to the si-C bond, and at least one organic base is directly connected with the silicon atom compound, is also used to those by oxygen, sulfur, nitrogen, such as organic base and silicon atom connected compounds as organic silicon compound. Among them, polysiloxane composed of silicon-oxygen bond (-Si-0-Si-) as the skeleton is the most in the number of organosilicon compounds, the deepest research, the most widely used, accounting for more than 90% of the total amount. Organosilicon materials have unique structures :(1) sufficient methyl groups on Si atoms shield the high energy polysiloxane main chain; (2) C-H is non-polar, resulting in very weak intermolecular interaction force; (3) Si-O bond length is long, Si-O-Si bond Angle is large. (4) Si-O bond is a covalent bond with 50% ionic bond characteristics (covalent bond has directivity, ionic bond has no directivity). 2, silicone resin, silicone resin is a highly crosslinked network structure of organic siloxane, usually with methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl chlorosilane or methyl phenyl dichlorosilane various mixture in the presence of organic solvents such as toluene, hydrolytic decomposition under low temperature, acid hydrolysate. The initial products of hydrolysis are a mixture of circular, linear, and crosslinked polymers, often containing considerable hydroxyl groups. The hydrolysate is washed to remove the acid, and the neutral primary polycondensation polymer is thermally oxidized in air or further polycondensation in the presence of catalyst, finally forming a highly cross-linked three-dimensional network structure.

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Organic polysilazane IOTA 9150K-IOTA