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Method of lowering content of cyclic oligomer in polyester chip and maintaining excellent hue

A technology for cyclic oligomers and polyester chips, which is applied in the field of reducing the content of cyclic oligomers in polyester chips and maintaining a good color tone, can solve the problems of poor color tone, unworkableness, and high cost, so as to reduce the content , good color, good processing effect

Inactive Publication Date: 2007-08-22
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Cyclic oligomers can be removed by organic extraction, but this method is not feasible in industry due to high cost, troublesome operation, and the need to recover a large amount of organic solvents
[0007] There is another method now is to heat-treat the slices. Although this method can achieve the purpose of reducing the cyclic oligomers, the result of the treatment has caused the color tone to deteriorate, especially the b value, which affects the polyester itself. Excellent performance

Method used

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  • Method of lowering content of cyclic oligomer in polyester chip and maintaining excellent hue
  • Method of lowering content of cyclic oligomer in polyester chip and maintaining excellent hue
  • Method of lowering content of cyclic oligomer in polyester chip and maintaining excellent hue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A treatment method capable of reducing the content of cyclic oligomers in polyester chips and maintaining good color tone, comprising the composite application of antioxidants and phosphorus-containing compounds, and then vacuum-drying the polyester chips for heat treatment.

[0046] Wherein the antioxidant is a compound of the following structure:

[0047] Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester, its trade name is: Antioxidant 1010

[0048] Structural formula:

[0049]

[0050] Molecular formula: C 73 h 106 o 12

[0051] Phosphorus-containing compounds specifically refer to:

[0052] AP1500, its structural formula is as follows:

[0053]

[0054] Asahi Denka PEP36, its structural formula is:

[0055]

[0056] and phosphoric acid

[0057] Concrete reaction process is as follows:

[0058] At a temperature of 250° C., 166 parts (weight) of terephthalic acid are subjected to direct esterification reaction in 75 parts (...

Embodiment 2

[0070] The consumption of catalyzer is: the addition relative to polyester weight is:

[0071] The amount of antioxidant 1010 added is 400ppm

[0072] The amount of phosphorus added in AP1500 is 16ppm

[0073] The amount of magnesium added in the magnesium compound is 40ppm

[0074] The addition amount of antimony element in antimony compound is 200ppm

[0075] The amount of potassium added in potassium hydroxide is 5ppm

[0076] The rest are the same as in Example 1, the section after heat treatment is determined to have a cyclic trimer content of 0.334wt%, and a hue b value of 8.7.

Embodiment 3

[0078] The consumption of catalyzer is: the addition relative to polyester weight is:

[0079] The amount of antioxidant 1010 added is 400ppm

[0080] The amount of phosphorus added in Asahi Denka PEP36 is 40ppm

[0081] The amount of magnesium added in the magnesium compound is 40ppm

[0082] The addition amount of antimony element in antimony compound is 200ppm

[0083] The amount of potassium added in potassium hydroxide is 5ppm

[0084] The rest are the same as in Example 1, the section after heat treatment is determined to have a cyclic trimer content of 0.358wt%, and a hue b value of 7.7.

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Abstract

The process of preparing polyester chip with low cyclic oligomer content and excellent hue includes a polymerization step to obtain polyester chip in the presence of catalyst including Mg compound, Sb compound, K compound, P compound and antioxidant; and a post-treatment step comprising vacuum drying and heat treatment in inert atmosphere. The prepared polyester chip has cyclic oligomer content lower than 1 wt% and excellent hue.

Description

Technical field: [0001] The invention relates to a treatment method which can not only reduce the content of cyclic oligomers in polyester chips, but also keep the polyester chips in good tone. 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. [0003] General industrial PET contains about 2% to 3% of oligomers, including monomers, dimers, and trimers, mainly cyclic trimers, accounting for about 70% of the total oligomer content. Due to the high chemical stability and thermal stability of the cyclic trimer, it is easy to aggregate and crystallize, and the melting point of the oligomer in PET i...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/86
Inventor 卢群英罗伟本田圭介
Owner TORAY FIBER RES INST(CHINA) CO LTD
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