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Preparation system and method of polyethylene terephthalate for optical film

A technology of polyethylene terephthalate and a preparation system is applied in the field of preparation system of polyethylene terephthalate for optical films, and can solve the problem of short cleaning and maintenance period of oligomer and small molecules, and oligomerization. It can reduce the thermal degradation reaction, reduce the reaction temperature, and reduce the amount of oligomers precipitated by eliminating the problems such as large amount of precipitation of impurities and small molecular impurities, and dark color of light polyester products.

Active Publication Date: 2021-03-09
江阴赛胜新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing optical polyester products are dark and yellowish in color, and are not suitable for high-brightness and high-transparency optical film polyester film products; the downstream users have a large amount of oligomers and small molecular impurities during use, resulting in The user's production equipment system oligomer small molecule cleaning and maintenance cycle is short

Method used

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  • Preparation system and method of polyethylene terephthalate for optical film
  • Preparation system and method of polyethylene terephthalate for optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (Example 1, preparation system of polyethylene terephthalate for optical film)

[0047] See figure 1 , The preparation system of polyethylene terephthalate for optical film of the present embodiment comprises slurry tank 1, the first esterification reactor 2, the second esterification reactor 3, the first polycondensation reactor 4, the second Dicondensation reactor 5, condenser 6, condensation EG storage tank 7, rectification tower 8, heat exchanger 9, EG collection tank 10 and connecting pipelines.

[0048] The slurry tank 1 , the first esterification reactor 2 , the second esterification reactor 3 , the first polycondensation reactor 4 , and the second polycondensation reactor 5 are connected sequentially through pipelines. The slurry tank 1 is equipped with a stirring device, and the connecting pipeline between the slurry tank 1 and the first esterification reaction kettle 2 is provided with a density meter, a thermometer and a pump. The first esterification react...

Embodiment 2

[0056] (Example 2, preparation system of polyethylene terephthalate for optical film)

[0057] The preparation system of polyethylene terephthalate for the optical film of the present embodiment is the same as that of Embodiment 1, the difference is that: the feed inlet of the EG supplementary pipeline 104 on the first esterification reactor 2 is not the same as that of the first esterification reactor 2 The discharge line below the rectification column 8 is connected, rather, to the hot EG line 102 .

Embodiment 3

[0058] (Example 3, preparation method of polyethylene terephthalate for optical film)

[0059] The preparation method of the polyethylene terephthalate for the optical film of the present embodiment adopts the preparation system described in Example 1, comprising the following steps:

[0060] ①Preparation system startup: Add ethylene glycol and terephthalic acid in a molar ratio of 1.1 to 1.4:1 to the slurry tank 1 and mix them. Ethylene glycol is output from the EG storage tank, and enters the slurry tank 1 through the normal temperature EG pipeline 101, the heat exchanger 9 and the hot EG pipeline 102. At this time, there is no high-temperature EG in the heat exchanger 9, so it enters the slurry tank 1 is still room temperature EG. Terephthalic acid is added from feed port 11.

[0061] Then the mixture is passed through the first esterification reactor 2 (reacted at 245-255 degrees Celsius, 100-150Kpa for 4-6 hours, and the reaction process is continuously mechanically sti...

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Abstract

The invention discloses a preparation system and method of polyethylene terephthalate for optical films. The preparation system of the invention remodels the EG pipeline of the slurry tank, and the feed port of the EG pipeline is connected with a fresh The EG storage tank uses 100% fresh EG ingredients in the preparation process, and a heat exchanger is added in the pipeline between the fresh EG storage tank and the slurry tank, so that hot EG enters the slurry tank instead of normal temperature EG, maintain the slurry temperature in the slurry tank, ensure that the density meter display on the slurry pipeline will not be affected by the temperature fluctuation of the slurry tank, and ensure that the molar ratio of ingredients is accurate. The film made of polyethylene terephthalate prepared by the method of the invention has high light transmittance, low haze, high brightness and no yellowing, and the number of crystal points in the film product decreases by 35%.

Description

technical field [0001] The invention relates to a preparation system and method of polyethylene terephthalate for optical films. Background technique [0002] PET polyester film refers to a film made of polyethylene terephthalate polymer by biaxial stretching. Optical grade PET polyester film requires high light transmittance, low haze, high brightness, no yellowing, good adhesion, good flatness, no light and dark lines, high temperature and ultraviolet radiation resistance, good stiffness, anti-burning, Not easy to break and so on. [0003] The existing optical polyester products are dark and yellowish in color, and are not suitable for high-brightness and high-transparency optical film polyester film products; the downstream users have a large amount of oligomers and small molecular impurities during use, resulting in The user's production equipment system oligomer small molecule cleaning and maintenance cycle is short. [0004] Chinese patent document CN 102516509A (ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78C08G63/183
CPCC08G63/183C08G63/785
Inventor 于维波傅丙立陈福银王忠利张强季建国邢印宁
Owner 江阴赛胜新材料有限公司
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