High-viscosity copolyester and preparation method

A technology of high-viscosity copolyester and copolyester, which is applied in the field of polyester materials and its preparation, can solve the problems of insufficient transparency, high acetaldehyde content, and low intrinsic viscosity, and achieve the effect of reasonable design and low acetaldehyde content

Active Publication Date: 2018-03-09
ZHEJIANG WANKAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetaldehyde content of the polyester products made by the above-disclosed prior art is relatively high, and the intrinsic viscosity is not high and not transparent enough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-viscosity copolyester, its components include: 85 parts by weight of terephthalic acid PTA, 1 part by weight of isophthalic acid IPA, the above is a dibasic acid; the glycol is 32 parts by weight of ethylene glycol MEG, methyl Propylene glycol MPD 1.8 parts by weight; Catalyst selects ethylene glycol antimony, and its antimony content accounts for 200ppm of dibasic acid quality; Stabilizer selects phosphoric acid, and its phosphorus content accounts for 10ppm of dibasic acid quality; The PRT global red dispersant-2 whose model is 283-10068-2 is added in an amount of 0.25ppm of the weight of the dibasic acid. The blue dye is PRT global 285-10135-2 produced by Carlos Asia Co., Ltd. Blue dispersant-2, its addition amount is 0.67ppm of dibasic acid weight.

[0031] The preparation method is:

[0032] (1) Continuous liquid phase polymerization process:

[0033] The first-stage esterification reaction: the above-mentioned components are prepared into a slurry first, ...

Embodiment 2

[0046] A high-viscosity copolyester, its components include: 86 parts by weight of terephthalic acid PTA; glycol MEG30 parts by weight, methyl propylene glycol MPD 4.8 parts by weight, diethylene glycol DEG 0.56 parts by weight; catalyst Ethylene glycol antimony is selected, and its antimony content accounts for 300ppm of the terephthalic acid mass; phosphoric acid is selected as a stabilizer, and its phosphorus content accounts for 20ppm of the terephthalic acid weight; the red dye is PRT global red dispersant produced by Carlos Asia Co., Ltd. -2, its addition amount is 0.5ppm of the weight of terephthalic acid, and the blue dye is selected from the PRT global blue dispersant-2 produced by Carlos Asia Co., Ltd., and its addition amount is 1.4ppm of the weight of terephthalic acid.

[0047] The preparation method of this embodiment is roughly the same as that of Example 1, the difference is that:

[0048] (1) Continuous liquid phase polymerization process:

[0049] The first-...

Embodiment 3

[0061] A high-viscosity copolyester, its components include: 86 parts by weight of terephthalic acid PTA; 28 parts by weight of ethylene glycol MEG and 7.5 parts by weight of methylpropylene glycol MPD as the glycol; The content accounts for 20ppm of the weight of the dibasic acid; the stabilizer is phosphoric acid, and its phosphorus content accounts for 6ppm of the weight of the dibasic acid.

[0062] The preparation method of this example is roughly the same as that of Example 1, except that the polycondensation reaction time of the third stage solid phase thickening process in the step (2) continuous solid phase polymerization process is 30 h.

[0063] According to GB17931-2003 test copolyester technical indicators: intrinsic viscosity 0.890dL / g; acetaldehyde content 0.4ppm; terminal carboxyl group content 28mmol / kg; diethylene glycol content 0.84%; glass transition temperature 67 ℃; melting point 236 ℃; Color value L value 87, b value -1.6.

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Abstract

The invention relates to high-viscosity copolyester. The high-viscosity copolyester is characterized by containing the following components: terephthalic acid PTA and isophthalic acid IPA which are taken as binary acid as well as ethylene glycol MEG, methyl propanediol MPD and diethylene glycol DEG which are taken as dihydric alcohol, wherein the molar ratio of the binary acid to mixed dihydric alcohol is 1:(1.04-2), the usage amount of isophthalic acid accounts for 0-10mol% of the total usage amount of the binary acid, the usage amount of methyl propanediol accounts for 1-38mol% of the totalusage amount of the dihydric alcohol, and the usage amount of the diethylene glycol accounts for 0-1.8mol% of the total usage amount of the dihydric alcohol. The invention also relates to a preparation method of the high-viscosity copolyester. Compared with the prior art, the invention has the advantages that the preparation method is reasonable, and the obtained high-viscosity copolyester has theadvantages of high viscosity, high brightness and low acetaldehyde content.

Description

technical field [0001] The invention belongs to the field of polyester materials and its preparation, and in particular relates to a high-viscosity copolyester and its preparation method. Background technique [0002] Polyester products, as a class of engineering plastics with excellent performance and wide application, have been widely used in chemical fiber, plastic, film and other industries. In the prior art, it is mostly produced by transesterification polycondensation method, direct esterification polycondensation method, etc., such as the Chinese invention patent "A Copolyester of Ethylene Glycol 1,2-Propylene Terephthalate" with application number 200910087052.6 (The authorized notification number is CN101921385B) discloses a copolyester of ethylene terephthalate 1,2-propylene glycol, which uses 1,2-propylene glycol as the third monomer to add terephthalic acid or terephthalic acid In the synthesis system of dimethyl ester and ethylene glycol, polyethylene terephtha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/191C08G63/19C08G63/78C08G63/85C08G63/86
CPCC08G63/19C08G63/191C08G63/20C08G63/78C08G63/85C08G63/866
Inventor 邱增明郑兵华云章延举肖海军沈志刚徐慧芬
Owner ZHEJIANG WANKAI NEW MATERIAL
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