Silane coupling agent is a kind of alkoxysilane, and its alkoxy group will undergo hydrolysis reaction when it encounters water to become hydroxysilane, and at the same time release the by-product of the reaction - the corresponding alcohol. This reaction is the hydrolysis reaction of the silane coupling agent, and the factors that affect the speed of this reaction are as follows: 1. The pH of the aqueous solution of the silane coupling agent: the hydrolysis reaction of the silane coupling agent when the pH of the aqueous solution is equal to 7, that is, neutral The speed of silane coupling agent is the slowest, and acid or alkali has obvious catalytic acceleration effect on the hydrolysis reaction of silane coupling agent. Therefore, in general, non-amino silane hydrolysis should use acid to adjust the pH value of the solution to 3 to 5, and then add silane dropwise. Coupling agent; and the aqueous solution of aminosilane has strong alkalinity, so aminosilane is generally directly added dropwise without adjusting the pH value of the aqueous solution with acid.

Concentration of silane coupling agent in water: Like general chemical reactions, the greater the concentration of reactants, the faster the chemical reaction. Therefore, a higher silane coupling agent will speed up the hydrolysis reaction, and of course, this will also result in a faster self-polymerization speed of the hydrolyzate.

Solubility of silane coupling agent in water: Different silane coupling agents have different solubility in water with different polarities. The silane coupling agent with higher solubility is more soluble in water and is in full contact with water. , so the hydrolysis rate will be relatively fast. For this purpose, it is very necessary and important to fully stir when the silane coupling agent is dissolved in water.

Temperature: Like the general chemical reaction, the speed of the hydrolysis reaction of the silane coupling agent has a positive correlation with the temperature, that is, the higher the temperature, the faster the speed. Therefore, in summer and winter, the change of ambient temperature will also affect the speed of the hydrolysis reaction of the silane coupling agent.

5. Alcohol co-solvents: Like the general chemical reaction, if some products are added to the reactants, the existence of the products will slow down the speed of the chemical reaction, and the chemical reaction is partially reversible. If some alcoholic solvents, such as ethanol, are added to the solution, the hydrolysis reaction speed of the silane coupling agent will be slowed down.