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Method for adding catalyst in industrial production of optical film-grade polyester chips

A polyester chip and catalyst technology, applied in the field of polyester production, can solve the problems of long residence time in the prepolymerization tank, affecting optical properties such as slice transparency, and uneven gas-liquid phase mixing, etc., to achieve better optical properties and stable color , color and transparent effect

Inactive Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, in the prior art, catalysts and auxiliary additives need to be added to the oligomer pipeline in the production process of optical film-grade polyester chips, which may cause the residence time of the prepolymerization tank to be too long, and the gas-liquid phase mixing is not uniform enough. This in turn creates technical issues affecting optical properties such as transparency of slices

Method used

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  • Method for adding catalyst in industrial production of optical film-grade polyester chips
  • Method for adding catalyst in industrial production of optical film-grade polyester chips
  • Method for adding catalyst in industrial production of optical film-grade polyester chips

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Embodiment 1～9

[0031] A method for adding a catalyst in the industrial production of optical film grade polyester chips, the specific steps are as follows:

[0032] (1) 50Kg of titanium-based catalyst with a titanium content of 0.4% and 1250L of ethylene glycol are configured into a solution, and a certain amount of chromaticity agent, optical brightener, and thermal stabilizer are stirred evenly;

[0033] (2) Inject the mixed solvent into the feed line of the final polymerization tank through a syringe, in the final polymerization tank with an absolute pressure of 10-800Pa, a temperature of 270-300°C, and a reaction residence time of 1.8-2.5h. reaction. The amount of titanium added before the reaction material is 0.8-1.5ppm, the amount of titanium added after is 0.15-0.20ppm, the amount of colorimeter added is 0.0025-0.0032ppm, and the amount of whitening agent added is 0.30-0.40ppm , The amount of heat stabilizer added is 0.25-0.35ppm, based on the theoretical amount of polyester.

[003...

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Abstract

The invention discloses a method for adding a catalyst in industrial production of optical film-grade polyester chips. The method comprises the following specific steps: adding a part of a titanium catalyst according to a conventional method; uniformly stirring an ethylene glycol solution containing the other part of the titanium catalyst with a certain amount of a coloring agent, an optical brightening agent and a heat stabilizer, injecting an obtained mixture into a system through an injector on a feeding pipeline of a final polymerization kettle of a continuous polyester device to participate in reaction, and performing final polycondensation reaction to obtain the optical film-grade polyester chips. The polyester chips obtained by the method are high in transparency, stable in color and luster and excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of polyester production, and in particular relates to a method for adding a catalyst in the industrial production of optical film grade polyester chips. Background technique [0002] Polyester film (PET) refers to a film material made of polyethylene terephthalate as a raw material, which is made into a thick sheet by extrusion and then biaxially stretched. [0003] Optical polyester film is widely used in protective films and reflective films for liquid crystal displays, touch screens, etc., which require high optical properties due to their good high transparency, superior mechanical properties and chemical resistance. However, the polyester chips currently on the market have insufficient properties such as transparency and gloss, resulting in yellowish, grayish color and other shortcomings in the subsequent production of polyester optical films, which restricts the application of polyester films in electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85C08G63/78C08G63/183
CPCC08G63/85C08G63/78C08G63/183
Inventor 高冰冰沈伟李华赵惠康周贵强林雪梅任明利张林春朱国明洪献伟
Owner CHINA PETROLEUM & CHEM CORP
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