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Copolyester and application thereof

A technology of copolyester and diol, applied in the field of copolyester, can solve the problems of poor polyester heat resistance, unfavorable spinning smoothly, environmental pollution, etc. rising effect

Inactive Publication Date: 2011-04-27
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patents CN1534114A, CN101063236A, and CN101357981A disclose the method of forming polyester by copolymerization with glycols with side chains, but the heat resistance of these polyesters is still not good, and antimony series catalysts (three antimony oxide, antimony acetate), which is easy to pollute the environment and is not conducive to the smooth progress of spinning

Method used

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  • Copolyester and application thereof
  • Copolyester and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add bishydroxyethyl terephthalate into the esterification reaction tank, keep the temperature at 250°C and the pressure at 1.2×10 5 Pa, 8.25kg of high-purity terephthalic acid and 3.54kg of ethylene glycol slurry were gradually added to the esterification reaction layer within 4 hours, and then the esterification reaction was carried out for 1 hour. Finally, 10.2 kg was taken from the obtained esterification reaction product and added to the polycondensation reaction layer.

[0037] The esterification reaction product is kept at 250 DEG C, under normal pressure, adds the 2-methyl-1 that is equivalent to the whole glycol 10mol% amount of gained polyester and stirs for 30 minutes (2 in the whole reaction process) The ratio of the moles of basic acid to the sum of the moles of ethylene glycol and 2-methyl-1,3 propanediol is 1:1.24). Then add phosphorus element with respect to the phosphoric acid of copolyester 18ppm, add titanium oxide particle amount after 5 minutes and ...

Embodiment 2

[0050] Change the addition of magnesium element in magnesium acetate to 20ppm, and the rest of the conditions are the same as in Example 1. The copolyester obtained has excellent heat resistance, [M] / [P]=2.6; during melt spinning, almost no Deposits around the spinneret hole and filter pressure increase during spinning. The obtained silk was tube-knitted, and the tube-knitted fabric was dyed at a temperature of 95° C., and the measured L* value was 28.4.

Embodiment 3

[0052] The addition of phosphorus element in phosphoric acid is changed into 12ppm, the addition of magnesium element in magnesium acetate is changed into 20ppm, all the other conditions are with embodiment 1, and the copolyester heat resistance that makes is excellent, [M] / [P]= 3.2; During melt spinning, deposits around the spinneret hole and increase in filter pressure during spinning were hardly observed. The obtained yarn was tube-knitted, and the tube-knitted fabric was dyed at a temperature of 95° C., and the L* value was measured to be 29.1.

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Abstract

The invention relates to copolyester and application thereof. The copolyester is prepared from diacid and dihydric alcohol through polymerization reaction in the presence of a catalyst. In components of diacid for forming the copolyester, the content of terephthalic acid structural unit is over 90 mol percent; in components of dihydric alcohol for forming the copolyester, the content of glycol structural unit is 70 to 99 mol percent, the content of aliphatic diol structural unit is 1 to 30 mol percent; and the content of antimony element is less than or equal to 5ppm in based on the total weight of the copolyester. In the polymerization process, a non-antimony catalyst is used and environment-friendly, reduces pollution on spinneret orifices in the spinning process and has environmental safety; the polymer has excellent tone; and the obtained copolyester fibers are high in heat resistance and good in dyeing property.

Description

technical field [0001] The invention relates to a copolyester and its application. Background technique [0002] Polyester, especially polyethylene terephthalate, has outstanding properties and is widely used in fiber, film and other fields, and is favored by people. [0003] Due to the poor dyeability of ordinary polyester fibers, it must be dyed under high temperature and high pressure, so its application is limited. There are many ways to overcome the difficulty of dyeing polyester fibers, and the copolymerization technology is one of the main means. For example: polymers formed by copolymerization with polyalkylene glycols such as polyethylene glycol, or polymers formed by copolymerization with linear aliphatic carboxylic acids such as adipic acid and sebacic acid. However, these methods must add ether bonds or multi-monomer copolymerization will lead to a decrease in heat resistance. [0004] On the other hand, antimony-based catalysts mainly composed of heavy metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85C08G63/83C08K3/32C08K5/521D01F6/92
Inventor 顾樱花吴亚薇青山雅俊
Owner TORAY IND INC
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