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 i

Method used

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  • Aliphatic-aromatic copolyester and preparation method thereof

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Example Embodiment

[0015] According to the first aspect of the present invention, the present invention provides a method for preparing an aliphatic-aromatic copolyester, which includes the following steps:

[0016] (1) Under the conditions of the transesterification reaction, the component a and the component b are contacted and reacted in the presence of a catalyst, the molar ratio of the added amount of the component a and the component b is 1:0.8-3, the catalyst Contains a first catalyst, and optionally a second catalyst;

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

[0018] (3) Under the conditions of the polycondensat...

Example Embodiment

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

[0023] Under the conditions of the transesterification reaction, the component a and the component b are subjected to the transesterification reaction in the presence of the first catalyst, and the molar ratio of the added amount of the component a and the component b is 1:0.8-3, preferably 1 :1 to 3, more preferably 1.2 to 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 optionally added, so that the total added amount of component a and component c is the same as that of the component. The molar ratio of the total added amount of component b is 1:0.8-6 (preferably 1:1.15-2.5), and then the reaction occurs under the conditions of the esterification reaction.

[0025] According to another embodiment of the present invention, the process of the above steps (...

Example Embodiment

[0058] Example 1

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

[0060] Add 1.72 mol of dimethyl terephthalate, 2.77 mol of 1,4-butanediol and 0.72 mmol of tetrabutyl titanate to a 2.5L reaction kettle, stir and heat to reflux under a nitrogen atmosphere, and adjust the temperature To 200°C and react at this temperature, when the methanol produced by the reaction is completely evaporated (the reaction proceeds for about 100 minutes), then add 1.86 mol of 1,4-succinic acid and 2.22 mol of 1,4-butane to it Diol, 7.34mmol of pentaerythritol and 0.62mmol of lanthanum stearate, continue to heat and stir to reflux, adjust the temperature to 220°C and react at this temperature, when the water produced by the reaction is completely evaporated (the reaction proceeds for about 100 minutes ), the absolute pressure in the reactor is adjusted to 200 Pa or less, the temperature is adjusted to 240° C.,...

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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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