Preparation method of polyester substance, polyester substance, polyester chip and polyester film

Abstract

The invention specifically discloses a preparation method of a polyester substance, the polyester substance, a polyester chip and a polyester film. The preparation method comprises the following operation steps of: a) mixing an acid component with an alcohol component, and performing esterification reaction or transesterification to obtain an ester; b) performing condensation polymerization to the ester obtained in the step a) under the effect of a catalytic system; and c) obtaining the polyester substance from the step b), wherein the catalytic system adopts a germanium dioxide catalyst, and the germanium dioxide is in form of a tetragonal crystal or a hexagonal crystal or is in an amorphous state. The polyester substance, polyester chip and polyester film prepared by the preparation method have low chromatic value b, high degree of purity and other outstanding characteristics, and are specifically suitable for being used for preparing an optical thin-film with high performance requirement.

Description

technical field [0001] The invention belongs to the field of polyester materials, and in particular relates to a preparation method of a polyester product, a polyester product, a polyester chip and a polyester film, and is especially suitable for manufacturing various optical films. Background technique [0002] Polyester film is widely used in many industries and fields due to its high light transmittance and gloss, good air tightness and excellent mechanical properties, high toughness, impact strength and stable size. Different fields have different performance requirements for polyester films. With the rapid development of the home appliance industry, the flat panel display industry occupies a large amount of market resources. Due to the excellent performance of the aforementioned polyester film, various brightness enhancements used in various types of liquid crystal displays such as LCDs and LEDs of various sizes and sizes Various optical films such as optical film and ...

AI Technical Summary

Problems solved by technology

Antimony-based catalysts use metal antimony as the main component, mainly including antimony trioxide, antimony acetate, antimony glycol, etc., but the activity of this catalyst is low, the production energy consumption is too large, and metal antimony is easy to precipitate. will directly affect the film quality

In addition, more importantly, antimony is a heavy metal element that coexists with highly toxic arsenic in nature. Therefore, antimony-based catalysts generally contain a very small amount of lead and arsenic. If used for a long time, it will cause serious harm to humans and the environment. Negative Effects

Especially in recent years, with the improvement of living standards, the global requirements for the environment are getting higher and higher, and various countries are restricting the use of some environmentally harmful chemicals, so antimony-based catalysts are not the preferred catalyst materials

The titanium-based catalyst is mainly liquid titanate. This titanium-based catalyst has high catalytic activity and low energy consumption for the reaction. However, it is the high activity of the titanium-based catalyst that leads to its high catalytic activity for both forward and reverse reactions. , which causes the polyester produced by the titanium-based catalyst to have a higher chromaticity b value, and the appearance of the slice is yellow

[0004] At present, there are some technologies that use the method of adding toner to improve the disadvantages of the yellow appearance of polyester, but this way of adding toner can only be alleviated to a certain extent, so it has not been able to be used to make optical films. requirements

[0005] The Chinese patent with the publication number CN101805495A discloses a polyester composition and a polyester film, and proposes to use a polycondensation catalyst containing inorganic particles such as aluminum compounds and lithium compounds to polymerize the polyester composition. However, the inorganic particles described in the patent Particles are easily condensed into a large number of coarse particles, causing foreign matter on the surface of the polyester film, which damages the appearance and quality; and the inorganic particles such as aluminum compounds and lithium compounds generally need to be added after the esterification reaction is completed, otherwise, the implementation effect is poor. Adding substances after the esterification reaction will inevitably lead to more cumbersome process operability.

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