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A kind of preparation method of polyethylene terephthalate

A technology of polyethylene terephthalate and terephthalic acid, which is applied in the field of preparation of polyethylene terephthalate, can solve the problems of low glass transition temperature, poor flame retardancy, brittle cracking and the like, and achieves Improved limiting oxygen index and good compatibility

Active Publication Date: 2018-07-13
上海普信高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN105384921A relates to the field of flame-retardant polyester fibers. In order to solve the technical problems of PET polyester with poor hydrophilicity, poor flame retardancy and poor droplet resistance, the invention proposes an intumescent flame-retardant hydrophilic polyester chip and its preparation method , the surface water contact angle of the slice is 45-60°, the melting point is 245-255°C, and the limiting oxygen index is 28-35%.
[0005] However, for the existing PET engineering plastics, it still has poor flame retardancy, poor toughness, and low impact strength. The glass transition temperature of the fixed phase is low; the existing crystallization nucleating agents make it imperfect in the crystallization process, some are nucleated by chain scission, and some are crystallized by adding high-mesh inorganic substances , so that the existing engineering materials have some defects such as mucous membrane, brittle cracks, and insufficient temperature resistance.

Method used

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  • A kind of preparation method of polyethylene terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Esterification reaction

[0019] In the reactor, add 100 parts by weight of terephthalic acid, 50 parts of ethylene glycol, 22 parts of tetraphenyl dipropylene glycol diphosphite, 0.06 parts of polyoxyethylene octadecyl ether phosphate isophthalic acid Formic acid-5-sodium sulfonate; the esterification temperature is 220°C, the slurry supply time is 5 hours, and the esterification reaction time is 5 hours; the esterification distillate reaches 90% of the theoretical value, and the esterification is stopped to obtain an intermediate product.

[0020] (2) Polycondensation reaction

[0021] In parts by weight, after the intermediate product was moved into the polycondensation tank, 0.04 parts of 5-phosphoribose-1-pyrophosphate sodium salt, 0.07 parts of (3-glycidyl ether propyl)-1,1,3,3-tetra After the addition of methyldisiloxane, vacuumize and polycondense, the polycondensation temperature is 295°C, and the polycondensation time is 4 hours; the masterbatch obtained ...

Embodiment 2

[0023] (1) Esterification reaction

[0024] In the reactor, add 100 parts by weight of terephthalic acid, 30 parts of ethylene glycol, 10 parts of tetraphenyl dipropylene glycol diphosphite, 0.01 part of polyoxyethylene octadecyl ether phosphate isophthalic acid Formic acid-5-sodium sulfonate; the esterification temperature is 180°C, the slurry supply time is 3 hours, and the esterification reaction time is 3 hours; the esterification distillate reaches 90% of the theoretical value, and the esterification is stopped to obtain an intermediate product.

[0025] (2) Polycondensation reaction

[0026] In parts by weight, after transferring the intermediate product into the polycondensation tank, add 0.01 part of 5-phosphoribose-1-pyrophosphate sodium salt, 0.01 part of (3-glycidyl ether propyl)-1,1,3,3-tetra Methyldisiloxane, after the addition is completed, vacuumize for polycondensation, the polycondensation temperature is 250°C, and the polycondensation time is 5 hours; the ma...

Embodiment 3

[0028] (1) Esterification reaction

[0029] In the reactor, add 100 parts by weight of terephthalic acid, 70 parts of ethylene glycol, 30 parts of tetraphenyl dipropylene glycol diphosphite, 0.1 part of polyoxyethylene octadecyl ether phosphate isophthalic acid Formic acid-5-sodium sulfonate; the esterification temperature is 250°C, the slurry supply time is 10 hours, and the esterification reaction time is 8 hours; the esterification distillate reaches 90% of the theoretical value, and the esterification is stopped to obtain an intermediate product.

[0030] (2) Polycondensation reaction

[0031] In parts by weight, after the intermediate product was moved into the polycondensation tank, 0.1 part of 5-phosphoribose-1-pyrophosphate sodium salt, 0.1 part of (3-glycidyl ether propyl)-1,1,3,3-tetra After the addition of methyldisiloxane, vacuumize and polycondense, the polycondensation temperature is 320°C, and the polycondensation time is 5 hours; the masterbatch obtained by po...

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Abstract

The invention provides a preparation method of polyethylene terephthalate. The method comprises the steps that phosphorous acid, oxybis(1-methyl-2,1-ethanediyl) tetraphenyl ester and polyoxyethylene octadecene polyether phosphate ester 5-sulfoisophthalic acid sodium salt are introduced into polymerization of polyethylene terephthalate, and the novel polyethylene terephthalate polymer is prepared.

Description

technical field [0001] The invention relates to a preparation method of polyester, in particular to a preparation method of polyethylene terephthalate. Background technique [0002] Polyethylene terephthalate has the chemical formula (C10H8O4)n. English: Polyethyleneterephthalate, referred to as PET, is synthesized by transesterification of dimethyl terephthalate and ethylene glycol or esterification of terephthalic acid and ethylene glycol, and then polycondensation reaction. have to. It is a crystalline saturated polyester, a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. [0003] CN104559079A discloses a nano-modified PET engineering plastic and a preparation method thereof. The nano-modified PET engineering plastic includes 40%-60% of PET polyester, 20%-40% of glass fiber, 0.4% of lubricant, and 0.6% of antioxidant , toughening agent 2.5%, flame retardant 13%, synergistic flame retardant 2.5%, nano-nucleating agent 1%; through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L71/02C08G63/183C08K5/526
CPCC08G63/183C08K5/526C08L67/02C08L2201/02C08L71/02
Inventor 王荣军吴健泳
Owner 上海普信高分子材料有限公司
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