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Catalyst for preparing polyester, method for preparing same, and method for producing polyester

A technology of catalyst and polyester, which is applied in the field of polycondensation catalyst and its preparation of polyester, can solve the problems of lack of long-term stability, opacity, etc., and achieve the effect of improving long-term storage stability, good color tone, and inhibition of impurity coordination

Inactive Publication Date: 2015-08-19
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst was found to lack long-term stability in ethylene glycol and became opaque after several days of storage, forming a slurry containing precipitated metal components

Method used

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  • Catalyst for preparing polyester, method for preparing same, and method for producing polyester
  • Catalyst for preparing polyester, method for preparing same, and method for producing polyester
  • Catalyst for preparing polyester, method for preparing same, and method for producing polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Firstly, a catalyst for polycondensation of polyester is prepared, which is an ethylene glycol mixed solution containing titanium compound, polyhydric alcohol, phosphorus compound and metal compound. A kind of polyester is reproduced by the reactants of conventional production of polyester in the presence of the above-mentioned catalyst.

[0026] The preparation process of polyester polycondensation catalyst is as follows: 0.096 parts (weight) of D-mannitol, two (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate (PEP-36) 107.25 parts (weight), 4.35 parts (weight) of magnesium acetate were added to 100 mL of ethylene glycol and reacted at 80° C. for 0.5 hr. After cooling to 40° C., 0.15 parts of isopropyl titanate was added and stirred for 0.5 hr.

[0027] The polyester preparation process is: at a temperature of 250 ° C, 303 parts (weight) of dimethyl terephthalate and 112 parts (weight) of ethylene glycol undergo esterification reaction, and the resulting r...

Embodiment 2

[0029] The preparation process of polyester polycondensation catalyst is as follows: 0.192 parts (weight) of D-mannitol, two (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate (PEP-36) 107.25 parts (weight), 4.35 parts (weight) of magnesium acetate were added to 100 mL of ethylene glycol and reacted at 80° C. for 0.5 hr. After cooling to 40° C., 0.3 part of isopropyl titanate was added and stirred for 0.5 hr.

[0030] The polyester preparation process is: at a temperature of 250 ° C, 303 parts (weight) of dimethyl terephthalate and 112 parts (weight) of ethylene glycol undergo esterification reaction, and the resulting reaction product is placed in a rectification tower In the polymerization flask, add 1mL of the catalyst ethylene glycol solution for polyester polycondensation to mix, pre-condense under low vacuum for 60min, and then carry out polycondensation under high vacuum, the pressure is below 200Pa, when the reaction is completed, the inside of the flask Th...

Embodiment 3

[0032] The preparation process of polyester polycondensation catalyst is as follows: 0.192 parts (weight) of D-mannitol, four (2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite (P-EPQ ) 175.5 parts (weight) and magnesium acetate 0.975 parts (weight) were added to 100 mL of ethylene glycol and reacted at 80° C. for 0.5 hr. After cooling to 40° C., 0.359 parts of tetrabutyl titanate were added and stirred for 0.5 hr.

[0033] The polyester preparation process is: at a temperature of 250 ° C, 303 parts (weight) of dimethyl terephthalate and 112 parts (weight) of ethylene glycol undergo esterification reaction, and the resulting reaction product is placed in a rectification tower In the polymerization flask, add 1mL of the catalyst ethylene glycol solution for polyester polycondensation to mix, pre-condense under low vacuum for 60min, and then carry out polycondensation under high vacuum, the pressure is below 200Pa, when the reaction is completed, the inside of the flask The tem...

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Abstract

The present invention relates to a catalyst for preparation of polyester, its preparation method, and a production method of polyester. The catalyst is prepared from a titanium compound, polyol, a phosphorus compound and a metal compound by synthetic reaction, wherein a molar ratio of the titanium compound to polyol is 1:(1-2); a weight ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is 1:(1-10); and a molar ratio of the phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is 1:(1-2), and the metal compound excludes the titanium compound. The polycondensation catalyst has high catalytic activity, and is unhydrolyzed. The produced polyester has good hue and thermal stability.

Description

technical field [0001] The invention relates to a polycondensation catalyst for polyester preparation and a method for preparing polyester with it. Specifically, it is to suppress the problem that the catalyst used in the polymerization during the preparation of the polyester causes the increase of the spinning filter pressure and the reduction of the reactivity, and the obtained polyester has excellent color tone and thermal stability. Background technique [0002] Polyesters, especially polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate, are widely used in fibers, films and other molds due to their excellent mechanical, physical and chemical properties. Widely used in plastic products. [0003] At present, many catalysts used in industrial production and research are mainly three series of compounds: Sb, Ge, and Ti. At present, about 90% of the production uses antimony catalysts. Although the catalytic effect of antimony-based cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/87C08G63/85C08G63/83C08G63/16C08G63/183C08G63/78
Inventor 成娟杨娟望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD