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[Chemical Knowledge]：The production process and preparation method of silicone flame retardant.

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Silicone flame retardant is a widely used polymer material with excellent flame retardant and fireproof properties, which can not only effectively reduce the combustion performance of the material, but also improve the physical and chemical properties of the material. Therefore, silica gel flame retardants are more and more widely used in building materials, electronic devices, auto parts and other fields, and have become one of the important raw materials in modern chemical production. Next, this paper will focus on the production process and preparation method of silicone flame retardant.

1. silicone flame retardant production process

silicone flame retardant production process is roughly divided into dry and wet two ways. Among them, the dry production process is mainly to silica gel and other raw materials in a certain temperature conditions after drying, and then through additives including flame retardant, vulcanizing agent, accelerator, etc., press molding, and finally get silica gel flame retardant. The wet production process is the use of silica gel and other raw materials to react in aqueous solution, such as the addition of hydrogen-containing monomers in the chimeric polymerization reaction, after hydrolysis and condensation and other reactions, the final silica gel flame retardant. The preparation methods of

2. silica gel flame retardant

silica gel flame retardant are various. The common preparation methods are as follows:

1. The method of adding unsaturated hydroxyl compound

The unsaturated hydroxyl compound is dispersed and suspended in silane solvent, and then added to silica gel aqueous solution to react. The solid siloxane flame retardant formed by crosslinking has excellent water resistance and high temperature resistance.

2. Method for adding a silicone component

The silicone component is dispersed in an aqueous solution of silica gel by shaking and reacting to form a silica gel flame retardant. It is characterized by good flame retardant effect and excellent high temperature resistance.

3. Method for adding ternary composition

This method mainly uses silane, silicone resin and hydroxypolyamide as ternary composition, and prepares silica gel flame retardant after heating reaction. The flame retardant effect is good, and the formed silica gel flame retardant material has certain insulation properties.

4. Method for adding an organotin compound

The method is mainly to dissolve an organotin compound acetobutyrate in a water-soluble silicone resin aqueous solution with a solid content of 25%, and prepare a silica gel flame retardant through a heating reaction. This kind of silica gel flame retardant material has good flame retardant effect, and also has strong high temperature resistance and water resistance.