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Preparation method of ultraviolet-resistant polyester film

A polyester film, UV-resistant technology, applied in the preparation of carboxylate esters, organic compounds, carboxylic anhydrides, etc., can solve the requirements of high coating precision, uniformity and coating effect, copolyester anti-corrosion Reduced UV performance, reduced UV resistance of materials and other issues, to achieve long-term UV resistance, high synthesis yield, and easy storage and transportation

Active Publication Date: 2020-12-15
四川东方绝缘材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dibasic acid monomer of benzoxazinone group is in the synthesis of polyester copolyester resin, the benzoxazinone group is prone to ring-opening reaction under acidic environment conditions, and the structure of benzoxazinone is changed , the UV resistance of the copolyester is reduced;
[0004] (2) Masterbatch method: CN105924905B discloses "a kind of polyester film", adopts organic ultraviolet absorber to improve the ultraviolet resistance of polyester film, but ultraviolet absorber is mainly small molecule compound, and its shortcoming is that heat resistance is relatively poor , it is easy to volatilize when the processing temperature is relatively high, and it is easy to migrate during use, which reduces the UV resistance of the material;
[0005] (3) Coating method: CN104177955A discloses " anti-ultraviolet coating liquid for polyester film and preparation method and application ", is coating anti-ultraviolet coating liquid on the basis of transparent polyester film, and this method is to coating High precision, uniformity and coating effect are required, and the yield is difficult to control, and the practicability is poor

Method used

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  • Preparation method of ultraviolet-resistant polyester film
  • Preparation method of ultraviolet-resistant polyester film
  • Preparation method of ultraviolet-resistant polyester film

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preparation example Construction

[0038] A preparation method for UV-resistant polyester film, comprising the following steps (part one to part three):

[0039] The preparation of the first part novel ultraviolet absorber

Embodiment 1-1

[0041] ①Esterification reaction: Put 138kg of o-(m-, p-)hydroxybenzoic acid and 276kg of acetone into the reaction kettle, stir and dissolve at room temperature, add 166kg of acetyl chloride dropwise within 2h under cooling conditions, and keep the reaction at 30°C for 2h. The hydrogen chloride generated in the reaction process enters the absorption tower to obtain dilute hydrochloric acid. After the reaction is completed, the solvent is recovered by distillation and cooled to room temperature to obtain 220 kg of o-(m-, p-)formic acid phenol diacetate, with a yield of 99.6%, without refining, directly For the next acylation reaction;

[0042] ②Acylation reaction: Put the esterification product of the previous step, 445L of dry dichloroethane, 0.57kg of N,N-dimethylformamide and 150kg of anhydrous aluminum trichloride into the reaction kettle, stir and dissolve at room temperature, Raise the temperature to 70°C, slowly add 57kg of solid phosgene in dichloroethane solution (100L...

Embodiment 1-2

[0046] ①Esterification reaction: Put 138kg of o-(m-, p-)hydroxybenzoic acid and 303kg of acetone into the reaction kettle, stir and dissolve at room temperature, add 169kg of acetyl chloride dropwise within 2.5h under cooling conditions, and keep the reaction at 40°C for 2h The hydrogen chloride generated in the reaction process enters the absorption tower to obtain dilute hydrochloric acid. After the reaction is completed, the solvent is reclaimed by distillation and cooled to room temperature to obtain 220 kg of o-(middle, p-)formic acid phenol diacetate, with a yield of 99.3%, without refining. directly used in the next acylation reaction;

[0047] ②Acylation reaction: Put the esterification product of the previous step, 463L of dry dichloroethane, 1.3kg of N,N-dimethylformamide and 198kg of anhydrous aluminum trichloride into the reaction kettle, stir and dissolve at room temperature, Raise the temperature to 45°C, slowly add 66kg of solid phosgene dichloroethane solution ...

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Abstract

The invention discloses a preparation method of an ultraviolet-resistant polyester film, which is characterized by comprising the following steps: adding o-hydroxybenzoic acid and acetone into a reaction kettle, dropwisely adding acetyl chloride, and carrying out esterification reaction to obtain o-cresol diacetate; adding dichloroethane, N, N-dimethylformamide and anhydrous aluminum trichloride,dropwise adding a dichloroethane solution of solid phosgene, carrying out an acylation reaction, and distilling to recover the solvent; adding dilute hydrochloric acid and performing cooling, standing, solid precipitation, suction filtration, water washing and recrystallization after a hydrolysis reaction to obtain an ultraviolet light absorber; performing condensation polymerization reaction on terephthalic acid, ethylene glycol, an ultraviolet light absorber, antimonous oxide and trimethyl phosphate to obtain polyester chips; drying the polyester chips, extruding through an extruder, preparing a cast sheet through a cold drum, longitudinally stretching and transversely stretching the cast sheet, carrying out heat setting, and cooling to obtain the ultraviolet-resistant polyester film. The ultraviolet-resistant polyester film prepared by the method is suitable for solar backboard base films, building films, furniture films, packaging films and the like.

Description

technical field [0001] The invention belongs to the preparation of organic macromolecular compounds, and relates to a preparation method of an ultraviolet-resistant polyester film. The ultraviolet-resistant polyester film prepared by the invention can be applied to the fields of solar backboard base film (especially transparent solar backboard base film), construction film, furniture film, packaging film and the like. Background technique [0002] During the use of polyethylene terephthalate film (ie: PET polyester film), in the presence of natural ultraviolet rays, ultraviolet reactions occur, which gradually deteriorates the mechanical properties of the material, resulting in a greatly shortened service life. Therefore, in order to suppress the occurrence of ultraviolet aging reaction of PET polyester film, it is generally necessary to add an anti-ultraviolet absorber that can delay the ultraviolet aging of the material, so that the material has ultraviolet resistance, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G63/60C07C51/087C07C65/40C07C67/08C07C69/157C07C67/293C08L67/02
CPCC08J5/18C08G63/60C07C67/08C07C67/293C07C51/087C08J2367/02C07C69/157C07C65/40
Inventor 张世明周柯罗春明杨述斌
Owner 四川东方绝缘材料股份有限公司
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