Surface modification of silica
The surface modification of white carbon black is to make the chemical substances react with the hydroxyl groups on its surface, graft or coat other chemical substances, eliminate or reduce the number of surface silanol groups, and make the products from hydrophilic to hydrophobic, so as to achieve the purpose of changing the surface properties.
1. silane coupling agent modification
● by using the double reaction function of silane coupling agent, one end of the organic group reacts with the hydroxyl group on the surface of silica, and the other end reacts with polymer macromolecular chains such as rubber, which improves the surface properties of silica
Change.
2. alcohol ester modification
● on the surface of white carbon black, fatty alcohol reacts with silicon hydroxyl group to remove water molecules, and the silicon hydroxyl group is replaced by alkoxy group, thus changing the surface properties of white carbon black.
3. polymer grafting modification
● polymer grafting modification refers to grafting polymer onto silica in a chemical reaction under certain conditions surface.
4. polymer coating modification
● coating layers with different chemical composition are coated on the surface of white carbon black, so as to reduce the interaction between hydroxyl groups, ultimately reduce the surface energy and improve the dispersion.
5. modification by other methods
● white carbon black can also be modified by lotion polymerization, inorganic surface coating and ultrasonic modification.