High-refractive-index glass microbeads and preparation method therefor

Abstract

The present invention discloses a method for preparing high-refractive-index glass microbeads, including: mixing: mixing SiO2, TiO2, BaO, CaO, BaSO4, and ZrO2 raw materials in proportion to obtain a batch; sieving: sieving the batch to ensure uniform mixing; electric melting: placing the sieved batch in an electric furnace for melting, fining, and homogenization to form homogenized molten glass; centrifugal bead casting: passing the homogenized glass melt through a centrifugal bead casting device to form glass microbead precursors and collecting the glass microbead precursors; annealing: annealing the collected glass microbead precursors to eliminate internal stress; and flame polishing: performing flame exposure treatment on the annealed glass microbeads by using a set of flame spray guns to obtain high-refractive-index glass microbeads having smooth surfaces. Through improvements to the melting and fining process and the polishing process, suppressing crystallization inside and on the surfaces of the glass microbeads is realized to obtain high-refractive-index glass microbeads having characteristics including a high refractive index, a low crystallization rate, and a high coefficient of retroreflection.