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Polyester and production method thereof

A technology of polyester and transesterification reaction, which is applied in the field of hydrolysis-resistant polyester and its production, can solve the problems of impact and unfavorable performance of polyester products, and achieve the effect of improving hydrolysis resistance

Inactive Publication Date: 2010-11-24
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, thermoplastic materials mixed with stabilizers may adversely affect other properties of polyester products

Method used

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  • Polyester and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A hydrolysis-resistant polyester is a polyester synthesized by the transesterification method. Add inorganic antimony compounds and organic acid calcium compounds as catalysts in the transesterification process, add organic acid lithium compounds at the end of the transesterification reaction, and organic phosphorus compounds as catalysts in the polycondensation reaction;

[0043] Perform polycondensation reaction and solid-phase polymerization of the obtained small molecule polymer;

[0044] Inorganic phosphate as a buffer can be added before the transesterification reaction or after the transesterification or during the polycondensation reaction. The content of phosphorus in the phosphate is 1-200 ppm relative to the weight of the polyester.

[0045] The temperature of solid-phase polymerization is 180-240°C, and the preferred range is 210-230°C, and the vacuum degree of solid-phase polymerization is ≤130pa.

[0046] Among them, the polyester is polyethylene terephthalate obt...

Embodiment 2

[0061] Relative to the weight of polyester, the dosage of the following substances is:

[0062] Antimony compound 300ppm;

[0063] Calcium compound 900ppm;

[0064] Lithium compound 1800ppm;

[0065] Phosphorus compound 2400ppm;

[0066] The content of phosphorus in sodium dihydrogen phosphate is 55 ppm;

[0067] The rest is the same as in Example 1. The superposition time of the low-viscosity polyester was 2 hours and 30 minutes, the viscosity (IV) of the finally obtained polyester was 0.809, the hue L value of the polyester chips was 92.2, and the b value was 4.4. The COOH content of the polyester before the hydrolysis treatment was 9eq / t, and the BB% was determined to be 0.35 after the hydrolysis treatment. The results of the observation of foreign bodies were: 21 foreign bodies with a diameter of 1 to 8 μm, and 2 foreign bodies with a diameter larger than 8 μm.

Embodiment 3

[0069] Relative to the weight of polyester, the dosage of the following substances is:

[0070] Antimony compound 300ppm;

[0071] Calcium compound 900ppm;

[0072] Lithium compound 1800ppm;

[0073] Phosphorus compound 2400ppm;

[0074] The content of phosphorus in sodium dihydrogen phosphate is 90ppm;

[0075] The rest is the same as in Example 1. The superposition time of the low-viscosity polyester is 2 hours and 40 minutes, the viscosity (IV) of the finally obtained polyester is 0.810, the hue L value of the polyester chips is 93.9, and the b value is 4.0. The COOH content before the hydrolysis treatment of the polyester is 5eq / t, and the BB% is determined to be 0.30 after the hydrolysis treatment. The results of the observation of foreign bodies are: the number of foreign bodies between 1 and 8 μm is 25, and the number of foreign bodies larger than 8 μm is 2.

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Abstract

The invention discloses polyester and a production method thereof. The polyester at least contains a compound A derived from an inorganic antimony compound, a compound B derived from an organic acid calcium compound, a compound C derived from an organic acid lithium compound, a compound D derived from a stabilizer organic phosphorus compound and a compound E derived from inorganic phosphate, wherein the content of phosphorus elements in the inorganic phosphate relative to the weight of polyester is 1-200ppm. The invention has obvious advantages, an obtained polyester slice has favorable hydrolysis resistance, and a polymer has small foreign matter size.

Description

Technical field: [0001] The invention relates to a hydrolysis-resistant polyester and a production method thereof. Background technique: [0002] Polyester itself has excellent characteristics, especially polyethylene terephthalate (PET), polytrimethylene terephthalate and polybutylene terephthalate. Due to their 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, polyester is extremely susceptible to hydrolysis catalyzed by its remaining terminal acid groups, resulting in deterioration of physical properties. [0003] Because polyester end groups are sensitive to moisture, the industrial application of polyester is greatly restricted. Therefore, in order to expand its appli...

Claims

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Application Information

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IPC IPC(8): C08G63/00C08G63/183C08G63/87C08G63/80
Inventor 卢群英祁华梁婷
Owner TORAY FIBER RES INST(CHINA) CO LTD
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