METHOD FOR PREPARING THE SURFACE-MODIFIED POWDER WITH WATER-REPELLENT THIN LAYER ON THE SURFACE OF ORGANIC OR INORGANIC PARTICLE

摘要

A method for preparing a surface-modified powder with water-repelling thin layer on the surface of organic or inorganic particles is provided to form a thin-film coating layer on the surface of the powder through physicochemical vapor reaction using a water-repellent having a high boiling point. The method comprises the steps of: (a) crushing powder to be subjected to the surface modification into particles having uniform particle size; (b) absorbing evaporated coating materials from the surface of the particles having uniform particle size using a water-repellent such as acryl silicone-based compounds and branched alkyl silicone compounds; and (c) modifying the surface of the particles with a compound including double bonds such as alkene or siloxane having a vinyl group as a terminal group. In the step(b), an alkyl silane is further added to the water-repellent.