Hydrolysis-resistance polyester composition and preparation method there

A composition and hydrolysis-resistant technology, which is applied in the field of hydrolysis-resistant polyester composition and its preparation, can solve the problems of difficulty in maintaining physical properties and insufficient practicability, and achieve the effect of improving hydrolysis resistance

Inactive Publication Date: 2010-06-30
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the polymer is stored for a long time and used under very humid conditions, its physica

Method used

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  • Hydrolysis-resistance polyester composition and preparation method there

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Effect test

Embodiment 1

[0041] A hydrolysis-resistant polyester composition and its preparation method, which is obtained by precondensing aromatic dicarboxylic acid or its derivatives and aliphatic dihydric alcohol to obtain a small molecular polymer, and then performing polycondensation reaction on the small molecular polymer to obtain Polyester containing terminal carboxyl groups, antimony compound, phosphorus compound and magnesium compound are added in the polycondensation reaction to form a catalyst, and inorganic phosphate or composite inorganic phosphate is used as a buffer; The imine compound is blended and extruded to obtain a hydrolysis-resistant polyester composition. Relative to the weight of the polyester, the amount of phosphorus added in the inorganic phosphate is 1-100ppm, and relative to the weight of the polyester, 0.01-10wt% of an end-capping agent carbodiimide compound is added, preferably carbodiimide The added amount is 0.5-3.0 wt%.

[0042] The polyester is polyethylene terep...

Embodiment 2

[0056] Relative to the polyester weight, the following substances are added in amounts:

[0057] The addition amount of antimony element in the antimony compound is 120ppm;

[0058] The amount of phosphorus added in the phosphorus compound is 32ppm;

[0059] The addition amount of magnesium element in the magnesium compound is 60ppm;

[0060] The addition amount of potassium element in potassium hydroxide is 6ppm;

[0061] The amount of phosphorus added in sodium dihydrogen phosphate and disodium hydrogen phosphate is 69ppm;

[0062] N, N'-two-2,6-dicumylcarbodiimide addition 2.0wt%;

[0063] All the other are with embodiment 1. The viscosity of the obtained polyester is 0.667; the overlapping time is 3 hours and 10 minutes; the L value of the color of the polyester chip is 63.1, the b value is 5.5; the terminal carboxyl group content is 10eq / t; the obtained BB% after the hydrolysis treatment is 0.38. The results of observation of foreign objects were as follows: 27 forei...

Embodiment 3

[0065] Relative to the polyester weight, the following substances are added in amounts:

[0066] The addition amount of antimony element in the antimony compound is 120ppm;

[0067] The amount of phosphorus added in the phosphorus compound is 32ppm;

[0068] The addition amount of magnesium element in the magnesium compound is 60ppm;

[0069] The addition amount of potassium element in potassium hydroxide is 6ppm;

[0070] The amount of phosphorus added in sodium dihydrogen phosphate is 55ppm;

[0071] N, N'-two-2,6-dicumylcarbodiimide addition 1.0wt%;

[0072] All the other are with embodiment 1. The viscosity of the obtained polyester is 0.654; the overlapping time is 3 hours and 05 minutes; the L value of the color of the polyester chips is 65.3, the b value is 6.0; the terminal carboxyl group content is 11eq / t; the obtained BB% after the hydrolysis treatment is 0.45. The results of observation of foreign objects were as follows: 23 foreign objects with a size of 1-8 μ...

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Abstract

The invention discloses a hydrolysis-resistance polyester composition and a preparation method thereof. The hydrolysis-resistance polyester composition is prepared by blending a carboxyl-terminated polyester and a carbodiimide compound serving as an end-capping agent and extruding the blend, wherein the addition amount of the carbodiimide compound serving as the end-capping agent is 0.01 to 10 weight percent based on the weight of the polyester. The preparation method comprises: pre-polymerizing an aromatic dicarboxylic acid or a derivative thereof with an aliphatic divalent alcohol to obtain a low-molecular-weight polymer; subjecting the low-molecular-weight polymer to polycondensation to obtain the carboxyl-terminated polyester, wherein in the polycondensation, an antimony compound, a phosphorus compound and a magnesium compound are added to form a catalyst, and an inorganic phosphate or a compound inorganic phosphate is used as a buffer; and blending the carboxyl-terminated polyester obtained by the polycondensation and the carbodiimide compound and extruding the blend to obtain the hydrolysis-resistance polyester composition. The polyester obtained has high hydrolysis resistance and a small hydrolysis resistance indexes percent BB; and the sizes of foreign matters in the polymer are small.

Description

Technical field: [0001] The invention relates to a hydrolysis-resistant polyester composition and a preparation method thereof. Background technique: [0002] Polyester itself has excellent characteristics, especially polyethylene terephthalate (PET), polytrimethylene terephthalate and polybutylene terephthalate, due to its excellent mechanical, physical and chemical properties, Such as good mechanical strength, heat resistance, chemical resistance, and good transparency, it is widely used in various fields as fibers, films, resins, and other molded products. However, most polyesters have poor hydrolysis resistance in high-temperature and humid environments. Under such conditions, the polyester is easily hydrolyzed by the catalysis of its residual terminal acid groups, resulting in the deterioration of physical properties. [0003] Since the terminal group of polyester is sensitive to moisture, the industrial application of polyester is greatly limited. Therefore, in order...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08K5/29C08K3/32C08G63/91
Inventor 卢群英祁华朱丛静青山雅俊
Owner TORAY FIBER RES INST(CHINA) CO LTD
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