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Hydrolysis-resistant polyester composition and preparation method thereof

A composition and hydrolysis-resistant technology are applied in the field of hydrolysis-resistant polyester composition and preparation thereof, which can solve the problems of limited effect of polyester hydrolysis stability, complicated preparation process of end-capping agent, low production efficiency and the like, and achieve low toxicity. , low cost, and the effect of improving hydrolysis resistance

Inactive Publication Date: 2014-06-18
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN 1312327A discloses a hydrolysis-resistant polyester obtained by melting and heating polyester and a polymer end-capping agent containing epoxy and amino functional groups for end-capping reaction, but the preparation process of the end-capping agent is complicated and the production efficiency is low. high
[0005] U.S. Patent US3193522 discloses adding carbodiimide or polycarbodiimide to improve the hydrolytic stability of polyester, but this type of compound is toxic and expensive, it is difficult to use in large quantities, and the effect on improving the hydrolytic stability of polyester is limited

Method used

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  • Hydrolysis-resistant polyester composition and preparation method thereof
  • Hydrolysis-resistant polyester composition and preparation method thereof
  • Hydrolysis-resistant polyester composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Put terephthalic acid and ethylene glycol in a molar ratio of 1:1.14 in a polymerization flask equipped with a bottom material polyethylene terephthalate distillation column, and carry out esterification reaction at a temperature of 140°C . During the esterification reaction, add manganese acetate equivalent to 123ppm of the total amount of the polyester composition in terms of manganese, and antimony trioxide as a catalyst equivalent to 250ppm of the total amount of the polyester composition in terms of antimony. react. After the reaction is finished, the obtained diethylene terephthalate oligomer is transferred to a polymerization tank for polycondensation. In the polymerization kettle, add the stabilizing agent phosphoric acid equivalent to 59ppm of the total amount of the polyester composition in terms of phosphorus element, and the buffering agent sodium dihydrogen phosphate equivalent to 30ppm of the total amount of the polyester composition in terms of phosphoru...

Embodiment 2

[0069] In the polycondensation reaction process, add buffering agent sodium dihydrogen phosphate equivalent to 35ppm of polyester composition in terms of phosphorus element; 4.2mol% of phthalic acid, stirred and blended, spit out after 5 minutes, cooled and cut into pellets to obtain a hydrolysis-resistant polyester composition, and other steps were the same as in Example 1. The terminal carboxyl group content of the finally obtained polyester composition is 12.5eq / t, and the ΔCOOH after hydrolysis treatment is 29.2eq / t; the L value of the hue is 52.8, and the b value is 11.7; The structural unit accounts for 2.9 mol% of the terephthalic acid structural unit.

Embodiment 3

[0071] In the polycondensation reaction process, add the buffering agent sodium dihydrogen phosphate equivalent to 53ppm of the polyester composition in terms of phosphorus element; 0.5mol% of phthalic acid, stirred and blended, spit out after 5 minutes, cooled and cut into pellets to obtain a hydrolysis-resistant polyester composition, and other steps were the same as in Example 1. The terminal carboxyl group content of the polyester composition obtained in the end is 10.9eq / t, and the ΔCOOH after hydrolysis treatment is 28.1eq / t; the L value of the hue is 51.8, and the b value is 12.7; The structural unit accounts for 0.35 mol% of the terephthalic acid structural unit.

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Abstract

The invention discloses a hydrolysis-resistant polyester composition and a preparation method thereof. The hydrolysis-resistant polyester composition is mainly prepared by reacting aromatic dicarboxylic acid or a derivative of the aromatic dicarboxylic acid with aliphatic dibasic alcohol, wherein a buffer agent, namely inorganic phosphate equal to 15-115ppm of the polyester composition (counted by a phosphorus element) is added in a condensation polymerization process, and an end-capping agent, namely glycidyl ether is added in the condensation polymerization process. For achieving a preferable membrane preparation effect of the finally-obtained hydrolysis-resistant polyester composition, the content of the glycidyl ether in the polyester composition is preferably equal to 100-6000ppm of the weight of the polyester composition. The polyester composition obtained by utilizing the preparation method is ideal in hydrolysis resistance and can be applied to the fields of spinning, membranes and the like.

Description

technical field [0001] The invention relates to a hydrolysis-resistant polyester composition and a preparation method thereof. Background technique [0002] Polyester materials have excellent properties, especially polyethylene terephthalate (PET), which has excellent physical, chemical and mechanical properties, good mechanical strength, heat resistance, chemical resistance, With good transparency and other characteristics, it is widely used in various fields. [0003] Polyester materials are now widely used in various highly molecularly oriented stretched articles, such as fibers, films, moldings, etc. However, such materials have poor hydrolysis resistance and cannot be used outdoors for a long time. Generally, under dry heat conditions, polyesters have excellent hydrolysis resistance, but most polyesters are prone to hydrolytic breakage under humid heat conditions. This is because the end group of the polyester contains carboxyl groups, and the polyester is easily hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K3/32C08G63/183C08G63/189C08G63/91
Inventor 魏伟李旭望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD