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Method for producing poly-p-benzene dicarboxylic acid trimethylene glycol ester

A technology of polytrimethylene terephthalate and terephthalic acid, which is applied in the field of preparation of polytrimethylene terephthalate, and can solve the problems of lower thermal stability of polyester melt, yellowing of color, and inability to obtain light-colored products, etc. problem, to achieve the effect of good thermal stability and good color tone

Inactive Publication Date: 2008-02-27
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, when polyester is molded and processed, due to the high processing temperature, it will be degraded by thermal oxidation, and the molecular weight will drop sharply, causing the product to be brittle, the color will turn yellow, and the value of use will be lost.
In addition, it will gradually turn yellow during long-term storage or use, and it is impossible to obtain light-colored products
[0005] In order to improve the color tone, toners such as cobalt compounds are generally added, but the melting heat stability of polyester is reduced, and the transparency will also be reduced. It is common to add hindered phenolic antioxidants and phosphite prooxidants
For example, Japanese Patent Application No. 2004-43540 only adds triethyl 4 phosphite, which improves the stability of the product to varying degrees and improves the color change, but the effect is not satisfactory.

Method used

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  • Method for producing poly-p-benzene dicarboxylic acid trimethylene glycol ester
  • Method for producing poly-p-benzene dicarboxylic acid trimethylene glycol ester
  • Method for producing poly-p-benzene dicarboxylic acid trimethylene glycol ester

Examples

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Embodiment 1

[0020] A method for producing poly(trimethylene terephthalate), comprising esterification of terephthalic acid and 1,3-propylene glycol, and polycondensation of the esterification product, wherein the esterification catalyst used is tetrabutyl titanate ester (or tetraisopropyl titanate, tetraethyl titanate, titanium sulfate hydrolyzate, organic tin catalyst), the titanium compound of the following structural formula (B) is used as a catalyst in the polycondensation reaction, and the phosphorus compound of the following structural formula (A) is used. Compounds as stabilizers:

[0021]

[0022] Among them, R1~R4 in the phosphorus-containing compound [A] is an alkyl, cycloalkyl or aromatic hydrocarbon group with 4 to 25 carbons; for example, R1~R4 can be 3-methyl-5-ethyloctane, 2, 5-Dimethyl-3,4-diethylhexane, lauryl, stearyl, 2,3,7-trimethyl-5-ethyloctane, 2,4-dibutylphenyl, Octylphenyl, phenylnonyl, phenylbisphenol A, phenylisodecyl, etc.

[0023] R5-R8 in the titanium co...

Embodiment 2

[0034] Relative to the final polyester product amount, the addition amount of titanium element in the polycondensation reaction catalyst is 40ppm, and the addition amount of phosphorus element in the stabilizer phosphorus compound is 40ppm. All the other are with embodiment 1.

Embodiment 3

[0036] A toner cobalt compound, cobalt acetate, is also added to the polycondensation reaction.

[0037] Relative to the final polyester product amount, the addition amount of titanium element in the polycondensation reaction catalyst is 60ppm, the addition amount of phosphorus element in the stabilizer phosphorus compound is 40ppm, the addition amount of cobalt element in the toner cobalt compound is 30ppm, and the rest are implemented in the same way example 1.

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PUM

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Abstract

The invention discloses a preparing method of polyytrimethylene terephthalate alcohol, which is characterized by the following: proceeding esterification reaction for terephthalic acid and 1, 3-methyl glycol; getting the product; proceeding polycondensation reaction; adopting structural formula (B) titanium compounds as accelerant in the polycondensation reaction; adopting phosphoric compound of structural formula (A) as stabilizer. This invention adds anti-oxidant and cobalt compounds to additional color, which polyester chip possesses better color cast and good heat endurance.

Description

Technical field: [0001] The invention relates to a production method of polytrimethylene terephthalate. Background technique: [0002] Polyester, especially polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, because of their excellent mechanical, physical, and chemical properties, are widely used in fibers, films, and other molds. Widely used in plastic products. Currently, since 1,3-propanediol is available cheaply and on a large scale, poly(trimethylene terephthalate) will be a promising plastic in the future. It has a long-chain molecular structure and most of its properties are between those of terephthalate Between ethylene formate and polybutylene terephthalate. Suitable applications include the entire field of fibers and moldings. However, with the expansion of its use and demand, the requirements for the characteristics of polyester in various fields have become more stringent, so there are still many problems to be solved....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/85
Inventor 成娟李旭本田圭介
Owner TORAY FIBER RES INST(CHINA) CO LTD
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