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Preparation method of polyester, and polyester

A technology of polyester and oligomers, which is applied in the field of polymers, can solve the problems of poor thermal stability of polyester, achieve the effects of reducing re-agglomeration, improving thermal stability, and avoiding the introduction of heavy metal cobalt

Inactive Publication Date: 2020-03-31
CHINESE TEXTILE ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for preparing polyester to solve the technical problem of poor thermal stability of the existing polyester

Method used

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  • Preparation method of polyester, and polyester
  • Preparation method of polyester, and polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Prepare terephthalic acid, 2-methyl-1,3-propanediol, ethylene glycol, titanium catalyst and xylyldibutylbenzofuranone into slurry. The molar ratio of acid to alcohol in the slurry is 1:1.12, relative to 100 molar parts of terephthalic acid, 2-methyl-1,3-propanediol is 50 molar parts, ethylene glycol is 62 molar parts, and 12 molar parts of Ethylene glycol is excess aliphatic dihydric alcohol and will be removed in the subsequent reaction process; relative to the total weight of low-melting polyester, the addition of xylyl dibutyl benzofuranone is 300ppm, and the addition of titanium-based catalyst The amount is 6 ppm based on the content of titanium element.

[0062] (2) The slurry prepared in step (1) is continuously added to the esterification system composed of the first vertical esterification kettle and the second vertical esterification kettle for esterification reaction. The reaction temperature of the first esterification kettle is The reaction temperature ...

Embodiment 2

[0067] (1) Prepare terephthalic acid, 2-methyl-1,3-propanediol, ethylene glycol, titanium catalyst and methylene bis(4-methyl-6-tert-butylphenol) monoacrylate into slurry material. The molar ratio of acid to alcohol in the slurry is 1:1.12, relative to 100 molar parts of terephthalic acid, 2-methyl-1,3-propanediol is 60 molar parts, ethylene glycol is 52 molar parts, and 12 molar parts of Ethylene glycol is excess aliphatic dihydric alcohol and will be removed in the subsequent reaction process; relative to the total weight of low-melting polyester, the addition of methylene bis(4-methyl-6-tert-butylphenol) monoacrylate The amount is 500 ppm, and the addition amount of the titanium-based catalyst is 10 ppm based on the content of titanium element.

[0068] (2) The slurry prepared in step (1) is continuously added to the esterification system composed of the first vertical esterification kettle and the second vertical esterification kettle for esterification reaction. The reac...

Embodiment 3

[0073] (1) Terephthalic acid, isophthalic acid, 2-methyl-1,3-propanediol, diethylene glycol, ethylene glycol, titanium catalyst and [4-tert-butyl-2-(5-tert Butyl-2-oxo-3H-1-benzofuran-3-yl)phenyl]-3,5-di-tert-butyl-4-hydroxybenzoate was prepared as a slurry. The molar ratio of acid to alcohol in the slurry is 1:1.12, relative to 100 molar parts of aromatic dibasic acid, 2-methyl-1,3-propanediol is 60 molar parts, ethylene glycol is 51 molar parts, diethylene glycol is 1 molar part, wherein 90 molar parts of terephthalic acid and 10 molar parts of isophthalic acid in the aromatic dibasic acid, 12 molar parts of ethylene glycol are excess aliphatic dibasic alcohols and will be removed in the subsequent reaction process; Relative to the total weight of the low-melting polyester, [4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-1-benzofuran-3-yl)phenyl]-3,5 - The addition amount of di-tert-butyl-4-hydroxybenzoate is 50 ppm, and the addition amount of the titanium-based catalyst is 20 ppm b...

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Abstract

The invention discloses a preparation method of polyester, and the polyester. The preparation method comprises the following steps: (1) carrying out an esterification reaction on aromatic dibasic acid, aliphatic dihydric alcohol, a titanium catalyst and a carbon free radical scavenger to obtain an oligomer; (2) carrying out condensation polymerization on the oligomer to obtain a melt; and (3) curing the melt to obtain the polyester. The carbon free radical scavenger can efficiently capture carbon free radicals formed by the low-melting-point polyester in a high-temperature heated environment,so the thermal stability of the low-melting-point polyester is remarkably improved.

Description

technical field [0001] The invention belongs to the field of macromolecules, and in particular relates to a preparation method of polyester and polyester. Background technique [0002] Low-melting point polyester is a co-polymerized modified polyester with a low melting point, which is mainly used in the production of low-melting point polyester fibers. Low-melting point polyester fiber is a single-component or sheath-core composite fiber made of low-melting point polyester. Among them, the melting point of the core layer of the skin-core composite fiber is higher than that of the skin layer. After the skin layer is melted, the core layer part still maintains the fiber shape, so that it forms a point-like bond to ensure the performance of the bonded product. Low-melting point polyester fiber can start to melt and bond at a lower temperature. It can not only replace unenvironmentally friendly chemical adhesives, is green and environmentally friendly, but also has excellent a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/672C08G63/78C08K5/00
CPCC08G63/183C08G63/672C08G63/78C08K5/0091
Inventor 邱志成李鑫刘玉来任爽李志勇金剑武术芳王颖钟淑芳张凯悦
Owner CHINESE TEXTILE ACAD
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