1, 2-propylene glycol modified polyethylene terephthalate

A technology of ethylene glycol phthalate and terephthalic acid, which is applied in the field 1, can solve problems such as poor dyeing performance, and achieve the effects of improving solubility, reducing crystallinity, and reducing catalyst consumption

Inactive Publication Date: 2010-03-17
WUJIANG YINGXIANG CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polyethylene terephthalate (PET) is a polymer made by the polycondensation reaction of ethylene glycol and terephthalic acid, and it can also be produced by the polycondensation reaction of dimethyl terephthalate and ethylene glycol. For synthesis, ordinary PET, due to the regular structure of the macromolecular chain, the rigid structure of the molecular chain, is easy to crystallize, and the lack of hydrophilic groups will easily cause poor dyeing performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Add 0.1mol of terephthalic acid, 0.1mol of ethylene glycol, 0.01mol of 1,2-propanediol, toluenesulfonic acid and tert-butyloxytitanium compound into a reaction vessel with a stirrer, pass through Nitrogen, the temperature is raised to 240-260°C, the esterification reaction is carried out under the pressure of 0.25-0.3MPa, the reaction time is 1.5 hours, and then the temperature is raised to 270-280°C, the pressure is 8mmHg, and the polycondensation reaction is 3.5 hours. The number average molecular weight of the polyester is 22400, the molecular weight distribution index is 1.89, the color L value of the polyester is 87, the tensile strength of the polyester is 71MPa, the elongation at break is 284%, and the crystallinity is 19%.

example 2

[0016] 0.1mol of terephthalic acid, 0.1mol of ethylene glycol, 0.013mol of 1,2-propanediol, toluenesulfonic acid and tert-butyloxytitanium compound are added to a reaction vessel with a stirrer, and nitrogen gas is introduced , the temperature was raised to 240-260°C, the esterification reaction was carried out under the pressure of 0.25-0.3MPa, the reaction time was 1.5 hours, and then the temperature was raised to 270-280°C, the pressure was 7mmHg, and the polycondensation reaction was carried out for 3.5 hours. The number average molecular weight of the polyester is 23600, the molecular weight distribution index is 1.92, the color L value of the polyester is 83, the tensile strength of the polyester is 71MPa, the elongation at break is 276%, and the crystallinity is 16%.

example 3

[0018] 0.1mol of terephthalic acid, 0.1mol of ethylene glycol, 0.008mol of 1,2-propanediol, toluenesulfonic acid and tert-butyloxytitanium compound are added to a reaction vessel with a stirrer, and nitrogen gas is introduced , the temperature was raised to 240-260°C, the esterification reaction was carried out under the pressure of 0.25-0.3MPa, the reaction time was 1.5 hours, and then the temperature was raised to 270-280°C, the pressure was 5mmHg, and the polycondensation reaction was carried out for 3.5 hours. The number average molecular weight of the polyester is 24300, the molecular weight distribution index is 1.85, the color L value of the ester is 86, the tensile strength of the polyester is 73MPa, the elongation at break is 265%, and the crystallinity is 17%.

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Abstract

A 1, 2-propylene glycol modified polyethylene terephthalate is characterized in that a 1, 2-propylene glycol part is used to replace ethylene glycol to synthesize a 1, 2-propylene glycol modified PETcopolymer, the combination of a toluene sulfonic acid and a tert-butyl oxide titanium compound is used as a catalyst, a prepolymer is formed by carrying out esterification on a terephthalic acid and the ethylene glycol under the condition of pressurization, and then a polyester with high molecular weight and good color is obtained by conducting condensation polymerization on the prepolymer under the condition of high temperature and vacuum.

Description

technical field [0001] The invention relates to a 1,2-propanediol modified polyethylene terephthalate, belonging to the field of modified polyester synthesis. Background technique [0002] Polyethylene terephthalate (PET) is a polymer made by the polycondensation reaction of ethylene glycol and terephthalic acid, and it can also be produced by the polycondensation reaction of dimethyl terephthalate and ethylene glycol. For synthesis, ordinary PET, due to the regular structure of the macromolecular chain, the rigid structure of the molecular chain, is easy to crystallize, and the lack of hydrophilic groups can easily cause poor dyeing performance. Contents of the invention [0003] The purpose of the present invention is to utilize the 1,2-propanediol with reasonable price to reduce the crystallinity of PET, the symmetry of molecular main chain and improve the dyeing ability of polyester by introducing side methyl group on the main chain. [0004] A kind of 1,2-propanediol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85C08G63/87
Inventor 王国柱赵广兵沈家康钮真荣
Owner WUJIANG YINGXIANG CHEM FIBER
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