Abstract：In order to reduce the degree of hydrophilicity of wollastonite particles, improve its dispersibility and interface binding in organic medium, wollastonite was modified by sodium stearate, the impact of each factor in the modification process was tested, and surface wettability and dispersion of modified wollastonite in the medium were characterized. The results show that the water wetting contact angle of wollastonite modified by sodium stearate is increased to 69.33° by 10.83°, surface free energy is decreased from 102.17 m J/m² to 41.78 m J/m², and the dispersion of modified wollastonite in kerosene is improved significantly, and the variation trend of dispersity before and after wollastonite modification is explained by thermodynamic analysis.

Keywords: wollastonite; surface modification; particle dispersion