Soluble germanium chelate catalyst and preparation method therefor and use thereof

Abstract

A soluble germanium chelate catalyst and a preparation method therefor and use thereof. The preparation method comprises steps of: reacting germanium dioxide with an aqueous solution of an acid to generate a clear solution containing a germanium chelate, wherein the clear solution comprises excess acid; adding a Lewis base to the clear solution to neutralize the excess acid to obtain an aqueous solution of the germanium chelate; post-treating to give the soluble germanium chelate catalyst; the acid is selected from the group consisting of diacids, and C3-C6 diacids or triacids containing hydroxyl or amino group, and combinations thereof. The post-treatment comprises two methods: directly adding ethylene glycol, or cooling and crystallizing the aqueous solution, washing and drying, and then dissolving again in water and ethylene glycol. This catalyst can catalyze the polymerization of PETG or PCTG and significantly improve the viscosity and various hue qualities of the product.

Dependencies are inferred from the claim text.