Polyester chip for optical film and optical polyester film

Abstract

The invention relates to a polyester chip for an optical film. The polyester chip for the optical film is prepared by using the following process: mixing ethanediol, terephthalic acid and isophthalic acid in a pulping kettle to prepare a pulp solution; adding the ethanediol and antimony acetate or ethylene glycol antimony into a catalyst preparation kettle, and uniformly stirring to prepare a catalyst solution; adding a nanometer additive, a micron additive and the ethanediol into an additive preparation kettle, and uniformly stirring to prepare an additive solution; adding the pulp solution and the catalyst solution into an esterifying kettle, and heating to obtain an esterified product; after the reaction is ended, pressing the esterified product into a pre-polycondensation kettle, pressing the additive solution into the pre-polycondensation kettle at the same time, and vacuuming in pre-polycondensation reaction to discharge excessive ethanediol; pressing a pre-polycondensed product into a final polycondensation kettle so as to obtain a melt body; and cooling, pelletizing, discharging and packaging the melt body. When the polyester chip for the optical film is prepared, the nanometer additive is prepared into the additive solution after passing through an added dispersant and a high-speed emulsifying machine by using an ethanediol solution, and the additive solution is added in esterification or pre-polycondensation reaction, so that the difficult problem of the dispersion of the nanometer additive is solved, the sand granule-shaped fogging phenomenon of the general polyester film is overcome at the same time, the fogging degree of the film is reduced, and high light transmittance of the polyester film is guaranteed.

Description

technical field [0001] The invention relates to a polyester chip for optical film and an optical-grade polyester film prepared therefrom, belonging to the field of chemical materials. Background technique [0002] Due to its excellent mechanical properties, good dimensional stability, high transparency, and chemical resistance, polyester films are widely used in different industries, especially for protective films and reflective films in flat panel displays that require high optical properties. Membrane, Diffusion Membrane, etc. [0003] However, the optical properties of existing polyester films, such as transparency, gloss and haze, are insufficient. The transparency is reduced and the haze value is increased, so that it cannot meet the requirements of optical films such as protective films, reflective films, and diffusion films in flat panel displays that require high optical performance; In the production process of polyester film, polyester masterbatch chips containi...

AI Technical Summary

Problems solved by technology

[0003] However, the optical properties of existing polyester films, such as transparency, gloss and haze, are insufficient. The transparency is reduced and the haze value is increased, so that it cannot meet the requirements of optical films such as protective films, reflective films, and diffusion films in flat panel displays that require high optical performance; In the production process of polyester film, polyester masterbatch chips containing additive particles are usually added as a slip agent to increase the surface roughness of the film and make the film achieve good running performance

However, the addition of additives destroys the transparency of the film to a certain extent and increases the degree of fogging of the film, which seriously affects the light transmittance of the film and affects the optical properties of the polyester film, which is undesirable in many application fields. , especially in optical applications is lethal