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Aliphatic-aromatic copolyester and preparation method thereof

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

Active Publication Date: 2012-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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

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preparation example Construction

[0015] 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:

[0016] (1) Under transesterification reaction conditions, make component a and component b carry out contact reaction in the presence of catalyst, the molar ratio of the addition amount of component a and component b is 1: 0.8-3, and described catalyst containing a first catalyst, and optionally a second catalyst;

[0017] (2) Under esterification reaction conditions, in the presence of the first catalyst and the second catalyst, the reaction mixture obtained in step (1), component c, component d and the optionally added component Part b carries out contact reaction, the molar ratio of the total addition amount of described component a and component c and the total addition amount of described component b is 1: 0.8-6;

[0018] (3) under polycondensation reaction conditions, the r...

Embodiment approach

[0022] According to an embodiment of the present invention, the process of above-mentioned steps (1) and (2) may include:

[0023] Under transesterification reaction conditions, make component a and component b carry out transesterification reaction in the presence of the first catalyst, the molar ratio of the addition amount of component a and component b is 1: 0.8-3, is preferably 1 : 1-3, more preferably 1.2-2.5;

[0024] The reaction mixture obtained by the transesterification reaction, component c, component d and the second catalyst are mixed, and component b is selectively added, so that the total amount of the component a and component c added is the same as that of the component The molar ratio of the total added amount of part b is 1:0.8-6 (preferably 1:1.15-2.5), and then the reaction takes place under the esterification reaction conditions.

[0025] According to another embodiment of the present invention, the process of above-mentioned steps (1) and (2) may inclu...

Embodiment 1

[0059] This example is used to illustrate the aliphatic-aromatic copolyester and its preparation method provided by the present invention.

[0060] Add 1.72mol of dimethyl terephthalate, 2.77mol of 1,4-butanediol and 0.72mmol of tetrabutyl titanate to a 2.5L reactor, stir and heat to reflux under a nitrogen atmosphere, and adjust the temperature to 200°C and react at this temperature. When the methanol generated by the reaction is completely distilled off (the reaction is carried out for about 100 minutes), add 1.86mol of 1,4-butanedioic acid and 2.22mol of 1,4-butane Diol, the pentaerythritol of 7.34mmol and the lanthanum stearate of 0.62mmol continue to heat and stir to reflux, the temperature is adjusted to 220 ℃ and react at this temperature, when the water generated by the reaction is completely steamed out (the reaction is carried out for about 100 minutes) ), adjust the absolute pressure in the reactor to below 200Pa, adjust the temperature to 240°C, and polycondense at...

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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 catalysts comprising a first catalyst and selectively comprising a second 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 first catalyst and the second catalyst, and allowing an obtained reaction mixture to be subjected to polycondensation. 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 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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IPC IPC(8): C08G63/20C08G63/85C08G63/84C08G63/86C08G63/83
Inventor 祝桂香张伟韩翎许宁邹弋计文希
Owner CHINA PETROLEUM & CHEM CORP
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