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Low-precipitation polyester film and preparation method thereof

A polyester film and polyester chip technology, applied in the direction of coating, can solve the problems of increased precipitates, reduced precipitates, poor practical effect, etc., and achieves good precipitation, adjustable adhesion, and good thermal stability. Effect

Pending Publication Date: 2021-06-15
YIHUA TORAY POLYESTER FILM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual effect of this method is poor, and the precipitates can be slightly reduced. In practical applications, it cannot meet the requirements of conventional low-precipitation films; there is also a certain thickness of glue or resin coating on the surface to reduce the surface precipitates.
The coating material used in this processing method can only play a corresponding role when the thickness of the coating is relatively thick, usually reaching the micron level, and the coating itself has other characteristics, and the high temperature during processing will also lead to an increase in precipitates. Its main purpose is not to prevent precipitates, it is only suitable for use in specific fields, and the application range of subsequent processing is small

Method used

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  • Low-precipitation polyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] To prepare low-extraction polyester chips, the following steps are used:

[0023] S1. Mix terephthalic acid and ethylene glycol according to the molar ratio of 1:1.1, add catalyst, stabilizer and anti-ether agent to polymerize, the esterification temperature is 220°C, and the polycondensation temperature is 260°C;

[0024] S2, when the viscosity of the sample is between 0.40dL / g, the reaction is terminated to obtain a copolyester melt;

[0025] S3. The pellets are formed into strips by nitrogen pressure to obtain slices, and then the slices are subjected to solid-state polycondensation. When the viscosity of the sample is between 0.60dL / g, the reaction is terminated to obtain low-precipitation polyester slices.

[0026] To prepare a low-separation polyester film, the following steps are adopted:

[0027] Select the following raw materials by mass: 95 parts of low-precipitation polyester chips prepared above, 5 parts of anti-blocking agent, the anti-blocking agent is si...

Embodiment 2

[0031] To prepare low-extraction polyester chips, the following steps are used:

[0032] S1. Mix terephthalic acid and ethylene glycol according to the molar ratio of 1:1.6, add catalyst, stabilizer and anti-ether agent to polymerize, the esterification temperature is 240°C, and the polycondensation temperature is 270°C;

[0033] S2, when the viscosity of the sample is between 0.50dL / g, the reaction is terminated to obtain a copolyester melt;

[0034] S3. Extrude nitrogen into strips and cut into pellets to obtain slices, and then perform solid-phase polycondensation on the slices. When the viscosity of the sample is between 0.70dL / g, the reaction is terminated to obtain low-precipitation polyester slices.

[0035] To prepare a low-separation polyester film, the following steps are adopted:

[0036] Select the following raw materials by mass: 98 parts of the low-precipitation polyester chips prepared above, 2 parts of the anti-blocking agent, the anti-blocking agent is calciu...

Embodiment 3

[0040] To prepare low-extraction polyester chips, the following steps are used:

[0041] S1. Mix terephthalic acid and ethylene glycol according to the molar ratio of 1:2.0, add catalyst, stabilizer and anti-ether agent to polymerize, the esterification temperature is 260°C, and the polycondensation temperature is 290°C;

[0042] S2, when the viscosity of the sample is between 0.55dL / g, the reaction is terminated to obtain a copolyester melt;

[0043] S3. The pellets are cut into strips by nitrogen pressure to obtain slices, and then the slices are subjected to solid-state polycondensation. When the viscosity of the sample is between 0.80dL / g, the reaction is terminated to obtain low-precipitation polyester slices.

[0044] To prepare a low-separation polyester film, the following steps are adopted:

[0045] Selected raw materials: 100% low-precipitation polyester chips prepared above;

[0046] Using planar biaxial stretching process, through the process of crystallization d...

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Abstract

The invention discloses a low-precipitation polyester film which is prepared from the following raw materials in parts by mass: 95-100 parts of low-precipitation polyester chips and 0-5 parts of an anti-blocking agent, wherein the two surfaces of the low-precipitation polyester film are coated with the same or different coating liquids. The preparation method of the low-precipitation polyester chips comprises the following steps: mixing terephthalic acid and ethylene glycol according to a molar ratio of 1:(1.1-2.0), and adding an auxiliary agent for polymerization, wherein the esterification temperature is 220-260 DEG C and the polycondensation temperature is 260-290 DEG C; when the viscosity of the sample is between 0.40 dL / g and 0.55 dL / g, ending the reaction to obtain a copolyester melt; and conducting extruding to form strips by using nitrogen, condcuting granulating to obtain slices, carrying out solid-phase polycondensation on the slices, and ending the reaction when the viscosity of a sample is 0.60-0.80 dL / g to obtain the low-precipitation polyester chips. The invention also discloses a preparation method of the low-precipitation polyester film. The low-precipitation polyester film prepared by the invention has better thermal stability and low precipitation property, the haze is lower than 1%, and meanwhile, the haze rising value is less than 0.5% after the film is heated for 2 hours at 150 DEG C, so that the phenomenon of atomization is avoided when the film is heated.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a low-separation polyester film and a preparation method thereof. Background technique [0002] Low-separation polyester films are mainly used as base films for optical film processing. During the production and subsequent processing of ordinary polyester films, due to the influence of the heating process, low-molecular-weight substances usually precipitate out, and the precipitates stay on the surface of the film and cause fogging, thereby reducing the optical properties and surface cleanliness of the product. degree. Products for optical purposes have higher requirements on the appearance and optical properties of the base film, and the precipitation situation greatly limits the application of polyester films in some optical fields. In the prior art, low-separation polyester films are usually sliced ​​through ordinary polyester, and heat stabilizers are added during...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/80C08L67/02C08K3/36C08K3/22C08J5/18C08J7/04
CPCC08G63/183C08G63/80C08J5/18C08J7/042C08J2367/02C08K3/36C08K2003/2206C08J2467/00C08J2475/04C08J2433/12
Inventor 殷小波黄家阳田欣张彬曹小明王成籍强军
Owner YIHUA TORAY POLYESTER FILM CO LTD
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