This method uses a silane coupling agent to connect the inorganic and polymer interfaces together to obtain the best wetting value and dispersibility. The surface treatment method needs to acidify the silane coupling agent into a dilute solution to facilitate full contact with the surface to be treated. The solvents used are mostly water, alcohols or hydroalcoholic mixtures, and water containing no fluoride ions and cheap and non-toxic ethanol and isopropanol are suitable.
Except amino silane, solutions prepared from other silanes need to be added with acetic acid as a hydrolysis catalyst, and the pH value should be adjusted to 3.5-5.5. Long-chain alkyl and phenylsilane are not suitable for use as an aqueous solution due to their poor stability. During the hydrolysis of chlorosilane and acetoxysilane, severe condensation reactions will accompany it.
It is not suitable for use in aqueous solutions or hydroalcoholic solutions. For silane coupling agents with poor water solubility, 0.1% -0.2% mass fraction of non-ionic surfactants can be added first, and then processed into water emulsions by adding water. In order to improve the economic benefits of the product's hydrolytic stability, a certain proportion of non-carbon functional silanes can also be incorporated into the silane coupling agent. When handling difficult-to-stick materials, a mixed silane coupling agent or a carbon-functional siloxane can be used in combination.
After the treatment solution is prepared, it can be treated by dipping, spraying or brushing. Generally speaking, block materials, granular materials, and glass fibers are often treated by dipping; powder materials are mostly treated by spraying; if the entire surface of the substrate requires a coating, brushing is used.