PREPARATION METHOD OF HIGH REFRACTIVE INDEX GLASS BEADS BY COATING

摘要

PURPOSE: Provided is a preparation method of high refractive index glass beads used for road markers by coating low refractive index glass powder with high refractive index materials through sol-gel process, and thermal treating. CONSTITUTION: The glass beads with a high refractive index(more than 1.8) are prepared by the following steps: coating low refractive index glass powder(1) of soda lime composition, being 10-1000micrometer in size, with a sol of high refractive material which is an organic metal selected form the group consisting of Ti, Ba and Pb or salt thereof through an impregnating process; drying at room temperature for coating high refractive index glass powder with a coating film(4); and thermal treating over a softening point of low refractive index glass to form a glass bead(3) with a glass coating film(5).