| 摘要 |
PURPOSE:To obtain a material consisting of a core material coated with fine particle shell by spraying a suspension consisting of a large particle group as the core material and a small particle group as the film material and drying it. CONSTITUTION:A large particle group of silicon carbide, etc., having particle size in micron order and a small particle group of colloidal silica, etc., having about one fifth particle size of the large one in submicron are mixed to give a suspension. When the suspension is sprayed, the large particle group works as a core material and the small particle group works as the film material and a material consisting of the core material and fine particle shell covering the core material is obtained. The material is effectively used as drugs, agricultural chemicals, and fertilizers which sustainedly release. |
