Preparation method and use of rare earth coated titanium polyesterification catalyst

Abstract

The invention provides a preparation method and use of a rare earth coated titanium polyesterification catalyst. The preparation method comprises: heating a solvent to a certain temperature; dissolving a titanate, a phosphate, a silicate ester and other metal compounds in the organic solvent, stirring, keeping the temperature, dripping a small amount of water to promote hydrolysis and obtaining ared precipitate; and repeatedly washing the obtained red precipitate with acetone, removing residual ethanediol, drying the precipitate at 70 DEG C under vacuum and obtaining red powdered catalyst. The polyester prepared by using the catalyst has good hue, other properties of the titanium catalyst are also improved, the catalyst does not contain toxic stibium compounds, and therefore the toxicityof the stibium compounds to the environment and human body is eliminated. The preparation method is mainly to solve the technical problem of the conventional polyesterification process and the yellowing problem of polyethylene glycol terephthalate (PET) and improve the quality of the polyester.

Description

technical field [0001] The present invention relates to a preparation method of a catalyst and its application, in particular to a preparation method of a rare earth-wrapped titanium series polyester catalyst modified by tetraethyl orthosilicate and trimethyl phosphate and The application thereof belongs to the field of polyester catalysts. Background technique [0002] Polyethylene terephthalate (referred to as polyester, namely PET) is widely used due to its various excellent properties, especially polyester fiber is the largest variety of synthetic fiber and has been dominating the chemical fiber market. The polyester industry has always been the focus of the development of my country's chemical fiber industry, with an annual growth rate of more than 10%. It is estimated that by 2005, my country's polyester production capacity will exceed 15 million tons per year. In the past few years, due to the strong demand, major polyester manufacturers have expanded their productio...

AI Technical Summary

Problems solved by technology

But the yellowing problem of the product has not been perfectly solved

[0004] The hue L value of polyester is related to the brightness of polyester, and it is better to have a higher value. Generally, the hue L value of polyester is about 60; the hue b value of polyester is related to the anti-yellowness of polyester. The ester is less likely to turn yellow. When the hue b value is greater than 3.0, it means that the produced polyester is more yellow, which will affect the effect of polyester.