Preparation system and method of polyethylene glycol terephthalate used for optical film

A technology of polyethylene terephthalate and preparation system, which is applied in the field of preparation system of polyethylene terephthalate for optical film, and can solve the problem of short cleaning and maintenance period of oligomer small molecules, oligomer Problems such as large amount of impurities and small molecule impurities, dark color of light polyester products, etc., achieve the effects of reducing thermal degradation reaction, lowering reaction temperature, and less precipitation of oligomers

Active Publication Date: 2019-03-12
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 glycol terephthalate used for optical film
  • Preparation system and method of polyethylene glycol terephthalate used for optical film

Examples

Experimental program
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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 glycol terephthalate used for optical film. According to the preparation system, an EG pipeline of a slurry tank is modified, afeeding port of the EG pipeline is connected with a fresh EG storage tank, in a preparation process, fresh EG is used for preparation one hundred percent, and in the pipeline between the fresh EG storage tank and the slurry tank, a heat exchanger is additionally arranged, so that hot EG, rather than constant-temperature EG, enters the slurry tank, the temperature of slurry in the slurry rank is maintained, the fact that display of a densimeter on a slurry pipeline is not affected by slurry tank temperature fluctuation is guaranteed, and an accurate preparation molar ratio is ensured. The filmprepared by the polyethylene glycol terephthalate prepared through the method is high in light transmittance, low in haze, high in brightness, and free from yellowing, and the number of crystal pointsin a film product is reduced 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 Applications(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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