Surface modification particles and surface modification method of fine inorganic particles

摘要

PPROBLEM TO BE SOLVED: To improve reactivity by preventing aggregation of fine inorganic particles and enhancing dispersibility of the fine inorganic particles by allowing a surface modifying agent to infiltrate between primary particles being the fine inorganic particles which are aggregated to form secondary particles. PSOLUTION: When TEIS (triethoxypropylisocyanate silane) 2 as the surface modifying agent is reacted with colloidal silica 1 having an infinite number of hydroxyl groups on its surface in an autoclave by using n-hexane as a solvent at the critical temperature and pressure of n-hexane for 1 h, the n-hexane becomes a supercritical state and freely infiltrates between the aggregating colloidal silica 1, and all of tree ethoxy groups of TEIS 2 condensation react with the hydroxyl groups on the surface of the colloidal silica 1, and thereby, TEIS 2 is bonded to the surface of the colloidal silica 1. Thus, the surface of the colloidal silica 1 is covered with TEIS 2 by the reaction of the infinite number of hydroxyl groups on the surface of the colloidal silica 1 and TEIS 2, and surface-modified particles 3 are formed. PCOPYRIGHT: (C)2007,JPO&INPIT