Methylphenyl silicone
Industrialized production of methyl phenyl silicone resin is the main raw material of methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl chlorosilane, some or all of the above monomers solvent toluene, xylene, or mixed in certain proportion and, under stirring drops to the water, control the temperature of hydrolysis reaction, after the water washing to remove reaction by-products HCl (hydrochloric acid aqueous solution), The solution of hydrolyzed silicone alcohol is obtained, and then part of the solvent is evaporated into concentrated silicone alcohol, and then the silicone resin is prepared by cold shrinkage or hot condensation reaction, and the finished silicone resin is obtained after filtration and packaging.
2.2.3 General methylphenyl vinyl silicone resin and its related components
Methyl phenyl vinyl silicone resin and methyl phenyl silicone resin production process is similar, only in the hydrolysis of raw materials in addition to methyl chlorosilane and phenyl chlorosilane monomer, but also add an appropriate amount of methyl vinyl dichlorosilane and other organic silicone monomer containing vinyl. After hydrolysis, washing and concentration of the above mixed monomer, the concentrated hydrolyzed silicone alcohol is added with metal organic acid salt catalyst, condensed under pressure and heated to a predetermined viscosity, or the end point of the condensation reaction is controlled according to the gelation time to prepare methyl phenyl vinyl silicone resin.
Used as a methyl phenyl vinyl silicone crosslinking agent component addition reaction of methyl phenyl hydrogen polysiloxane, usually a small degree of polymerization of ring or linear polymers, they are made of methyl hydrogen dichlorosilane made by hydrolytic cyclization, or by methyl hydrogen dichlorosilane, phenyl trichlorosilane and trimethylchlorosilane were made by hydrolytic condensation.
Used to add active diluents of silicone resin is low viscosity of methyl phenyl vinyl polysiloxane, their synthetic methods and add molding silicone body composition methyl phenyl vinyl silicone similar, difference is that the raw material proportioning of vinyl monomer and side chain of single functional monomer (head) dosage is relatively large, in order to get high crosslinking activity of low viscosity polymer.