Polyester polycondensation catalyst, preparation method and application thereof

Abstract

The invention discloses a polyester polycondensation catalyst, a preparation method and application thereof. The preparation method comprises the following steps that: 1) a titanium-containing compound is hydrolyzed in water and / or an alcoholic solution to obtain a TiO2 sol, a silicon-containing compound is hydrolyzed in the water and / or the alcoholic solution to obtain a SiO2 sol, and the two sols are mixed evenly to obtain a TiO2 / SiO2 sol; and 2) the TiO2 / SiO2 sol and a nitrogen-containing or phosphorus-containing compound react to obtain a target product. The method for preparing the polyester polycondensation catalyst has simple and convenient process, is easy to operate, regulates and controls the activity of a catalytic center Ti through the coordination effect of the nitrogen-containing or phosphorus-containing compound with high thermal stability, remarkably reduces the using amount of the Ti, and fully inhibits the catalysis effect of the catalyst on a condensation side reaction and the thermal degradation of polyester. The catalyst does not need to add a toner during the use, has high catalytic efficiency, and can be used for catalyzing the polymerization of aromatic and aliphatic polyesters; and the using amount of the catalyst is greatly reduced and is about 0.0003 to 0.05 percent of the theoretical yield of the polyesters.

Description

technical field

[0001] The invention relates to a polyester polycondensation catalyst, a preparation method and application thereof. Background technique

[0002] Polyester is a very important material, which is widely used in packaging, transportation, textile, construction and other fields closely related to people's daily life. Today, my country has become the world's second largest producer of polyester. In 2006, my country's polyester output was 8.12 million tons, and it is expected to exceed 19 million tons in 2010. In the production of polyester, polyester polycondensation catalyst is essential. At present, the commonly used polyester polycondensation catalysts mainly include antimony series and titanium series. The antimony-based polycondensation catalyst has high activity and a small catalytic effect on thermal degradation of PET, and the obtained polyester material has good color and performance. However, the fatal disadvantage of antimony-based catalysts is th...

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