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Preparation method of polyester chip for optical film

A technology for polyester chips and optical films, which is applied in the field of preparation of polyester chips for optical films, can solve the problems of low definition and can not completely solve the problem of additive agglomeration, and achieves the problem of solving agglomeration, good mechanical properties and high definition. degree of effect

Active Publication Date: 2014-06-18
HEFEI LUCKY SCI & TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned documents all have the following two shortcomings: (1) The additive liquid directly participates in the polycondensation reaction of the esterified product
The surface treatment and dispersion process cannot completely solve the problem of agglomeration of additives, so that although the prepared optical film has high light transmittance and low haze, the clarity is still not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0019] The preparation method of the polyester chip for the optical film of the present embodiment has the following steps:

[0020] ① Add silicon dioxide and sodium hydroxide with a particle size of 20nm into deionized water and stir evenly, use ultrasonic waves to disperse, coat the surface of silicon dioxide, and then add the treated solution into the ethylene glycol solution , heated to 105° C. for solution replacement to remove water, to obtain an ethylene glycol suspension containing nano-scale silicon dioxide.

[0021] ② Add the suspension obtained in step ①, terephthalic acid and ethylene glycol into the slurry kettle, and mix and stir to obtain the slurry. The molar ratio of terephthalic acid to ethylene glycol is 1:1.15.

[0022] ③Put the slurry obtained in step ② into the esterification kettle, add the catalyst solution and the heat stabilizer solution at the same time, carry out the esterification reaction at 240°C for 4 hours, and obtain the esterified product. ...

Embodiment 2～ Embodiment 4）

[0027] The preparation method of the polyester chips for optical films of each embodiment is basically the same as that of Embodiment 1, and the differences are shown in Table 1.

[0028] Table 1

[0029] Example 1 Example 2 Example 3 Example 4 nanoscale additives 20nm silica 10nm silica 30nm silica 20nm silica The amount of nano-scale additives added 2000ppm 2500ppm 1500ppm 2000ppm Esterification temperature 240℃ 250℃ 230℃ 240℃ Esterification reaction time 4h 3.5h 4.5h 4h Precondensation reaction temperature 260℃ 265℃ 255℃ 260℃ Precondensation reaction pressure 400Pa 300Pa 500Pa 400Pa final polycondensation reaction temperature 280℃ 285℃ 280℃ 285℃ Final polycondensation reaction pressure 100Pa 70Pa 120Pa 100Pa intrinsic viscosity 0.66dl / g 0.68dl / g 0.67dl / g 0.64dl / g

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Abstract

The invention discloses a preparation method of a polyester chip for an optical film, which comprises the following steps that: (1) a nanoscale additive is subjected to surface treatment and dispersed in ethylene glycol to obtain a suspension; (2) the suspension obtained from the step (1) and terephthalic acid as well as ethylene glycol are added to a slurry kettle to be mixed and stirred to obtain a slurry; and (3) the slurry obtained from the step (2) and assistants are sequentially pressed into an esterification kettle, an upflow reactor, a pre-polycondensation kettle and a final polycondensation kettle to be sequentially subjected to an esterification reaction, a pre-polycondensation reaction and a final polycondensation reaction, and the material is discharged until the intrinsic viscosity of a material is 0.64dl / g to 0.68dl / g, cooled and pelletized to obtain the polyester chip for the optical film. The optical film prepared by the polyester chip prepared by the method provided by the invention not only has higher light transmittance and lower haze, but also has good mechanical properties, and especially also has higher clarity.

Description

technical field [0001] The invention relates to a preparation method of an optical material, in particular to a preparation method of a polyester chip for an optical film. Background technique [0002] Due to its excellent optical properties (high light transmittance, low haze, high clarity), good surface adhesion, good mechanical properties and heat resistance, optical films have been widely used in recent years, such as the flat panel display industry Diffusion film base mold in backlight module, optical film in high-grade in-mold injection molding, etc. [0003] Chinese patent document CN1482174A discloses a high-transparency polyester film and its production method, wherein the preparation process of the polyester master chip is as follows: first, the surface of the nano-scale silicon dioxide is treated with an organosilane coupling agent, specifically Use the gas phase spray method to coat the silane coupling agent in a vacuum chamber with a spray of gaseous nano-scale...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78C08G63/183C08K9/02C08K3/36C08K3/22C08K3/26C08K3/30
Inventor 王亮于维波金京权蒋澜朱新忠季建国赵保良
Owner HEFEI LUCKY SCI & TECH IND