| 摘要 |
<p>To provide a process of treating particulates such as an inorganic powder or resin beads to impart water repellency, to effectively impart water repellency particularly to a porous inorganic powder or the like, without use of an organic solvent as a dispersion medium of a silicone oil. Water repellent particulates are produced by a first step of adding, to particulates, an aqueous emulsion of a silicon compound such as a silicone oil to apply surface treatment to the particulates with mixing and stirring in a dry state, and a second step of heating the treated particulates to bake the silicon compound on the surface of the particulates and to separate the aqueous medium in the emulsion. The aqueous emulsion of the silicon compound is preferably an aqueous emulsion of any one of methyl hydrogen silicone oil, dimethyl silicone oil, epoxy-modified silicone oil, amino-modified silicone oil, polyether-modified silicone oil and carboxyl-modified silicone oil.</p> |
