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Method for preparing polyester slices for optical film and optical film

A polyester chip and optical film technology, applied in the field of optical materials, can solve the problems of affecting the optical properties of polyester film, affecting the light transmittance of the film, increasing the degree of fogging of the film, etc., so as to solve the problem of anti-adhesion of the film and have superior performance. , the effect of improving transparency and gloss

Inactive Publication Date: 2012-06-27
南京兰埔成实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Firstly, dimethyl terephthalate and ethylene glycol are subjected to a transesterification reaction at 190-210° C. according to a ratio of 1:2-2.5. After the reaction time is about 3.5 hours, the nanometer with an average particle diameter of 50 nm Treat the surface of high-grade silica, add silica and ethylene glycol into the sand mill, disperse at high speed for at least 4 hours, stir evenly to make silica additive liquid, and add the additive liquid to the pre-condensation reactor , and then add polycondensation catalyst ethylene glycol antimony, stabilizer phosphorus compound, etc., the pre-condensation reaction is completed, the pre-condensation product is pressed into the final polycondensation kettle, and the reaction is further carried out until the intrinsic viscosity is 0.62-0.68. slice.

[0020] The master chip and Dayouguang chip are co-extruded in three layers at a temperature of 260-290°C according to a certain ratio to form a film, and then stretched long...

Embodiment 2

[0022] The synthesis process is the same as in Example 1. First, dimethyl terephthalate and ethylene glycol are subjected to transesterification at 210° C. according to a ratio of 1:2.5. After the reaction time is about 3 hours, the average particle diameter of Treat the surface of nano-scale silica, add silica and ethylene glycol together into a sand mill, disperse at high speed for at least 4 hours, and stir evenly to make a silica additive solution. Add the additive liquid to the pre-condensation reaction kettle, then add the polycondensation catalyst ethylene glycol antimony, the pre-condensation reaction is completed, press the pre-condensation product into the final polycondensation kettle, and further react until the intrinsic viscosity is 0.62-0.68, and the polymerization is completed. Granulation yields mother chips.

[0023] The polyester film with a thickness of 75um is obtained by extruding the master chip and double-drawing. The film contains 500ppm of silicon dio...

Embodiment 3

[0025] The synthesis process is the same as in Example 1. Firstly, dimethyl terephthalate and ethylene glycol are subjected to a transesterification reaction at 200° C. according to a ratio of 1:2.2. After a reaction time of about 4 hours, nano-scale The surface of silica is treated by adding silica and ethylene glycol into the sand mill, dispersing at high speed for at least 4 hours, and then adding silica with an average particle size of 2um for surface treatment, micron-sized silica The content of the nano-scale silicon dioxide is between 4% and 10% by mass, and the mixture is uniformly stirred to prepare a silicon dioxide additive liquid.

[0026] The polyester film with a thickness of 75um is obtained by extruding the master chip and double-drawing. The film contains 300ppm of silica particles, the light transmittance of the film reaches 90%, the static friction is 0.41, the dynamic friction is 0.46, and the film haze is 2.4%. .

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Abstract

The invention discloses a method for preparing polyester slices for an optical film. The method comprises the following steps of: (1) mixing glycol and dimethyl terephthalate in a pulping kettle to prepare a slurry solution, putting glycol and a catalyst in a catalyst preparation kettle to prepare a catalyst solution, and putting nanoscale additives and glycol into an additive preparation kettle to prepare an additive solution; (2) putting the slurry solution and the catalyst solution in an esterifying kettle and heating to carry out ester exchange reaction so as to obtain an esterified matter; (3) pressing the esterified matter and the additive solution in a pre-polycondensation kettle, vacuumizing during the process of pre-polycondensation reaction, discharging superfluous glycol; and (4) pressing the product of the pre-polycondensation into a final polycondensation kettle to increase the viscosity of a fusant, and cooling and pelleting the fusant to obtain the polyester slices for the optical film. According to the method for preparing the polyester slices for the optical film, disclosed by the invention, the difficult problem of dispersivity of the nanoscale additives is solved, meanwhile, the phenomenon of sand-granular fogging of an ordinary polyester film is overcome, the fogging degree of the film is lowered, and the high light transmittance of the polyester film is ensured.

Description

technical field [0001] The invention relates to a polyester chip for optical film and a preparation method of the optical film, belonging to the field of optical materials. Background technique [0002] Polyester film is an optical material widely used in many different industries, with excellent mechanical properties, good dimensional stability, high transparency and chemical resistance. However, the optical properties of existing polyester films, such as transparency, gloss and haze, are insufficient. The main reasons are: the first is that the crystallization rate of polyester is relatively high, and a certain degree of crystallinity will be produced during film formation, resulting in The transparency of the film decreases, and the haze value increases, 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. Second, in the production process, in...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08K9/04C08K9/06C08K3/36C08L67/02B29C69/02B29L7/00
Inventor 金怀龙徐成呈沈安乐
Owner 南京兰埔成实业有限公司
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