Mechanism of surface hydrophobicity modification of wollastonite powder

In this paper, the surface of wollastonite powder is modified by sodium stearate, and the amount of modifier, modifying time, modifying temperature and slurry concentration are optimised. The modifying mechanism is revealed by infrared radiation, scanning electron microscope and particle size analyser. Results show that the surface of modified wollastonite powder should change from hydrophilic to hydrophobic, and the contact angle should change from 11 to 68 degrees. Sodium stearate is adsorbed on the surface of wollastonite through chemical bond. After being modified, wollastonite powder has better dispersion, and it can be used in organic systems like plastic and rubber.