Preparation method of Poly(terephthalic acid) 1,2-propanol copolyesters modified by Isophthalic acid

A polyterephthalic acid and isophthalic acid technology, applied in the field of modified polyester synthesis, can solve problems such as poor dyeing performance, and achieve the effects of reducing crystallinity and improving hydrophilicity

Inactive Publication Date: 2010-06-30
WUJIANG YINGXIANG CHEM FIBER
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The polyesters used for textile mainly include polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate. Due to the regular structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] Add the catalyst p-toluenesulfonic acid and titanium diethanol into the catalyst configuration tank, inject a small amount of 1,2-propanediol, stir and heat to dissolve the catalyst in 1,2-propanediol, and the dissolved 1,2-propanediol catalyst solution enters the dilution tank, filled with the remaining 1,2-propanediol. After stirring, the content of the catalyst is measured to complete the configuration of the catalyst solution.

[0014] Slurry configuration, adding terephthalic acid and isophthalic acid into the slurry configuration tank at a ratio of 95 to 5, injecting 1,2-propanediol catalyst solution, stirring and mixing to form a slurry, and transporting the prepared slurry to the esterification reaction unit.

[0015] The esterification reaction is carried out under the condition of nitrogen protection and a pressure of 0.13MPa, and the dibasic acid and dibasic alcohol are esterified to form a prepolymer. The reaction temperature is 220-240°C, and the reaction ...

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Abstract

The invention relates to a preparation method of Poly(terephthalic acid) 1,2-propanol copolyesters modified by Isophthalic acid, which is characterized in that the synthetic materials include terephthalic acid, 1,2-propanediol and Isophthalic acid, a combination of p-toluenesulfonic acid and ethanediol titanium is selected as a catalyst, and the ratio of materials dihydric alcohol and terephthalic acid is 1.10-1.14, the method comprises the following steps: 1, forming a prepolymer by the esterification reaction of aromatic binary acid and 1,2-propanediol under the pressurized condition; 2, performing a condensation polymerization of the prepolymer under the conditions of high temperature and high vacuum. The invention can synthesize high molecular weight copolyesters within a short time, lower the melting point and increase the hydrophilicity of the polyesters through the modification by copolymerization of Isophthalic acid, and ensure the dyeability of the polyesters under ordinary pressure.

Description

technical field [0001] The invention relates to a preparation method of isophthalic acid-modified poly-terephthalic acid 1,2-propanol copolyester, belonging to the field of modified polyester synthesis. Background technique [0002] The polyesters used for textile mainly include polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate. Due to the regular structure of the macromolecular chain and the rigid structure of the molecular chain, polyester Easy to crystallize, 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 structural properties of 1,2-propanediol and isophthalic acid to introduce side groups on the polymer main chain, break the regularity of polyester macromolecular chains, reduce the crystallinity of polyester, increase the The hydrophilicity of ester improves the dyeing ability of polyester. [0004] The invention rel...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/181C08G63/87C08G63/85
Inventor 沈家康赵广兵钮真荣俞根泉
Owner WUJIANG YINGXIANG CHEM FIBER
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