2.2.2 Methyl phenyl silicone resin
The main raw materials for industrial production of methyl phenyl silicone resin are methyltrichlorosilane, dimethyldichlorosilane, phenyltrichlorosilane, diphenyldichlorosilane, and some or all of the above monomers are doped with toluene or xylene. After mixing in an appropriate ratio, dropwise adding to water under stirring, controlling the temperature to carry out a hydrolysis reaction, removing the reaction by-product HCl (aqueous hydrochloric acid solution) by water washing to obtain a hydrolyzed silanol solution, and then distilling off part of the solvent to form a concentrated silanol, and then The silicone resin is obtained by cold condensation or thermal condensation reaction, and finally filtered and packaged to obtain a finished silicone resin.
2.2.3 Universal methyl phenyl vinyl silicone resin and related components
The production process of methylphenyl vinyl silicone resin and methyl phenyl silicone resin is similar, except that in the hydrolysis raw material, in addition to methylchlorosilane and phenylchlorosilane monomer, an appropriate amount of methylvinyl dichloride is added. A vinyl-containing silicone monomer such as silane. The mixed monomer is hydrolyzed, washed with water, and concentrated to obtain a concentrated hydrolyzed silanol, added with a metal organic acid salt catalyst, heated and condensed under reduced pressure to a predetermined viscosity, or controlled by a gelation time to obtain a methylphenyl group. Vinyl silicone resin.
a methylphenyl hydrogen-containing polysiloxane used as a component of a methylphenylvinyl silicone resin addition reaction crosslinking agent, usually a cyclic or linear polymer having a small degree of polymerization, which is a methyl group. Hydrogen-containing dichlorosilane is obtained by hydrolyzing cyclization or by cohydrolysis condensation of methyl hydrogen dichlorosilane, phenyltrichlorosilane and trimethylchlorosilane.
The reactive diluent used for the addition of silicone resin is a low viscosity methyl phenyl vinyl polysiloxane. The synthesis method is similar to that of the methyl silicone vinyl silicone resin which is the main component of the addition silicone resin. The difference lies in the raw material distribution. The amount of the monomer having a vinyl side chain and the monofunctional monomer (header) is relatively large, thereby obtaining a low-viscosity polymer having a high crosslinking activity.
2.2.4 Modified silicone resin
The production of the organic resin blend-modified silicone resin is usually carried out by adding an organic resin such as an alkyd resin, a phenol resin or an acrylic resin to a toluene or xylene solution of methylphenyl silicone resin, and uniformly mixing to obtain a finished product.
Copolymer modified silicone resins are produced by a series of chemical reaction processes. The organic resins copolymerizable with the silicone resin are polyester, epoxy, phenolic, melamine formaldehyde, polyacrylate, and the like. A variety of synthetic routes can be used to prepare the copolymerized silicone resin, but a more practical industrial production method is copolymerization of silanol and an organic resin. That is, the methyl chlorosilane and the phenylchlorosilane monomer are first co-hydrolyzed to obtain a hydrolyzed silanol solution or a concentrated solution, and then the previously synthesized organic resin prepolymer is added thereto, and the solvent is further mixed and evaporated. The catalyst such as zinc octoate and zinc naphthate is co-condensed at a temperature of 150-170 ° C until the reaction material reaches an appropriate viscosity or a predetermined gelation time, cooled, dissolved in a solvent, and filtered to obtain a finished copolymerized silicone resin.
3. High performance silicone resin
The general-purpose silicone resin prepared according to the aforementioned mature process and formulation can meet most of the conventional use requirements, but due to some inherent defects of the existing old type silicone resin, it cannot fully meet the higher use requirements. In order to meet the demanding requirements of higher performance, there is an urgent need to improve the synthesis process and formulation of the old products, and to develop new silicone resins with higher performance according to the needs of the development of new technologies.
Contact：Sharon Song(Sales manager)
Zhejiang Runhe Organosilicone New Material Co.,Ltd(Factory)
Zhejiang Runhe Chemical New Material Co.,Ltd(Exporter)
For more info, pls contact us.
We are always here for you.