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Aliphatic-aromatic copolyester and preparation method thereof

An aromatic and copolyester technology, applied in the field of preparation of aliphatic-aromatic copolyester, can solve the problems of low melt viscosity and high melt index of aliphatic-aromatic copolyester

Active Publication Date: 2012-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new method for preparing aliphatic-aromatic copolyesters in order to overcome the shortcomings of high melt index and low melt viscosity of the aliphatic-aromatic copolyesters prepared by existing methods. The method and the aliphatic-aromatic copolyester prepared by the method

Method used

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  • Aliphatic-aromatic copolyester and preparation method thereof
  • Aliphatic-aromatic copolyester and preparation method thereof

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preparation example Construction

[0016] According to a first aspect of the present invention, the present invention provides a kind of preparation method of aliphatic-aromatic copolyester, the method comprises the following steps:

[0017] (1) Under the first esterification reaction conditions, make component a and component b carry out contact reaction in the presence of the first catalyzer, the second catalyzer and the 3rd catalyzer, the add-on of component a and component b The molar ratio is 1: 0.8-3;

[0018] (2) Under the second esterification reaction conditions, in the continued presence of the first catalyst, the second catalyst and the third catalyst, the reaction mixture obtained in step (1), component c, Component d and optionally added component b undergo a contact reaction, and the molar ratio of the total amount of component a and component c added to the total amount of component b added is 1:0.8-6;

[0019] (3) Under polycondensation reaction conditions, the reaction mixture obtained in step...

Embodiment 1

[0064] This example is used to illustrate the aliphatic-aromatic copolyester and its preparation method provided by the present invention.

[0065] Catalyst: The catalyst consists of 0.64 mmol of lanthanum stearate, 0.72 mmol of tetrabutyl titanate, 0.43 mmol of dibutyltin oxide and 0.26 mmol of triphenylhydroxytin.

[0066]Add 1.72 mol of terephthalic acid, 2.77 mol of 1,4-butanediol and the above catalyst into a 2.5L reactor, stir and heat to reflux under a nitrogen atmosphere, adjust the temperature to 230°C and react at this temperature , when the water generated by the reaction is completely distilled off (the reaction is carried out for about 100 minutes), then add 1.86mol of 1,4-butanedioic acid, 2.22mol of 1,4-butanediol and 7.34mmol of pentaerythritol, and continue heating Stir to reflux, adjust the temperature to 200°C and react at this temperature. When the water generated by the reaction is completely distilled (the reaction is carried out for about 100 minutes), t...

Embodiment 2-6

[0068] This example is used to illustrate the aliphatic-aromatic copolyester and its preparation method provided by the present invention.

[0069] The aliphatic-aromatic copolyester was prepared according to the method of Example 1, except that the composition of the catalyst used in each example was shown in Table 1 below, so as to prepare white polymers P2-P6 respectively.

[0070] Table 1

[0071]

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Abstract

The invention relates to aliphatic-aromatic copolyester and a preparation method of the aliphatic-aromatic copolyester. The method comprises the steps of allowing an ingredient a to react with an ingredient b with the existence of a first catalyst, a second catalyst and a third catalyst, allowing an obtained reaction mixture, an ingredient c, an ingredient d and the selectively added ingredient b to react with the existence of the catalysts, and allowing an obtained reaction mixture to be subjected to condensation reaction. The first catalyst is a titanic oxide, an antimony oxide, a zinc oxide, M(OR1)n or M(-OOCR2)m; the second catalyst is a chemical compound with the chemical formula of RE(R3)3; the third catalyst is an organo-tin compound; the ingredient a contains aromatic dibasic acid and / or dibasic anhydride; the ingredient b is aliphatic dibasic alcohol; the ingredient c is aliphatic dibasic acid and / or dibasic anhydride; and the ingredient d is polyhydric alcohol, polybasic carboxylic acid or polybasic carboxylic anhydride with the degree of functionality greater than 2. The aliphatic-aromatic copolyester prepared according to the method is lower in melt index, and better in biodegradability and tensile mechanical property.

Description

technical field [0001] The invention relates to a preparation method of aliphatic-aromatic copolyester and aliphatic-aromatic copolyester prepared by the method. Background technique [0002] At present, thermoplastic aromatic polyesters, which are widely used in industry and daily life, have excellent thermal stability and mechanical properties, are easy to process and low in price. Polyethylene terephthalate (PET), and polybutylene terephthalate (PBT), for example, have been widely used in the manufacture of fibers, films and containers. However, these aromatic polyesters are difficult to degrade after being used and discarded, and no obvious direct degradation of aromatic polyesters such as PET and PBT by microorganisms has been observed so far. In order to combine the excellent properties of aromatic polyesters, since the 1980s, those skilled in the art have devoted themselves to the research of synthesizing aliphatic-aromatic copolyesters, that is, introducing aromatic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/85C08G63/86C08G63/83C08G63/84
Inventor 祝桂香张伟韩翎许宁邹弋计文希
Owner CHINA PETROLEUM & CHEM CORP
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