Polyester polycondensation catalyst, preparation method thereof and application thereof

Abstract

The invention relates to a polyester polycondensation catalyst, a preparation method thereof and application thereof. The method comprises the steps that: dispersing clay into dissolvant, performing iron exchanging with Ti ion-containing solution, removing the dissolvant, and calcinating under high temperature, wherein the usage amount of the Ti ion is 0.05-1mmol / g of clay; suspending the clay inclay dissolvant for processing organic chemical processing agent or surface processing agent, wherein the usage amount of the organic chemical processing agent is 0.1-1mmol / g of clay; the catalyst isused for the in-situ preparation of p-phenyl dicarboxylic acid gylcol ester or copolymer thereof and clay nanometer composite material; the adding amount of the catalyst is 0.1-10% of the weight of final polymerized p-phenyl dicarboxylic acid gylcol ester and clay nanometer composite material; and the Ti-based clay has high catalytic polycondensation, can shorten polymerization time, and is environment-friendly. The prepared PET and clay nanometer composite material has even clay dispersibility, and better material mechanical property and gas isolation performance.

Description

technical field [0001] The invention relates to a preparation method of a polyester polycondensation catalyst, which can prepare polyethylene terephthalate (PET) and clay nanocomposite materials in situ, and is nontoxic to the environment and human body. Background technique [0002] Polyester polycondensation catalyst is an essential raw material for the production of PET. At present, more than 90% of PET devices in the world use antimony-based catalysts, such as antimony trioxide and antimony acetate. The advantages of antimony-based catalysts are high catalytic activity, relatively low thermal degradation of PET, and excellent comprehensive performance. However, the fatal disadvantage of antimony-based catalysts is that antimony is carcinogenic, and antimony-containing ethylene glycol must be burned in a special furnace, or must be treated as dangerous goods, resulting in increased production costs. In addition, antimony can also be leached out during fiber dyeing, caus...

AI Technical Summary

Problems solved by technology

However, layered silicate such as montmorillonite has a strong ionic bond between the sheets. Due to the relatively weak polarity of the polyester, the compatibility with the clay is poor, and the clay is in the polyester. It is difficult to achieve complete peeling between the sheets, and it is easy to form large-scale agglomerations, resulting in limited improvement in the performance of polyester / clay nanocomposites

Moreover, the synthesis and processing of PET have to experience high temperatures of nearly 300°C, which often lead to the decomposition of organic cations, thereby inducing the decomposition of PET and reducing the thermal stability of PET.

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