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A kind of flexible aliphatic-aromatic-polylactic acid copolyester product and preparation method thereof

A polylactic acid copolyester and aromatic technology, applied in the field of flexible aliphatic-aromatic-polylactic acid copolyester products and its preparation, can solve the toxicity of modified polylactic acid and other problems

Active Publication Date: 2017-12-19
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 overcome the need to add a relatively high amount of metal-containing catalysts and / or diisocyanate coupling agents when polylactic acid is carried out to copolymerize and extend the chain, thus making the resulting modified polylactic acid highly toxic. The defect is to provide a method for preparing an aliphatic-aromatic-polylactic acid copolyester product that does not use a coupling agent and uses a lower content of a metal-containing catalyst to carry out copolymerization and chain extension modification of polylactic acid and Aliphatic-aromatic-polylactic acid copolyester products produced by it

Method used

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  • A kind of flexible aliphatic-aromatic-polylactic acid copolyester product and preparation method thereof
  • A kind of flexible aliphatic-aromatic-polylactic acid copolyester product and preparation method thereof
  • A kind of flexible aliphatic-aromatic-polylactic acid copolyester product and preparation method thereof

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preparation example Construction

[0017] The present invention provides a kind of preparation method of aliphatic-aromatic-polylactic acid copolyester product, and the method comprises the following steps:

[0018] (1) In the presence of a titanium series catalyst, component a, component b and component c are subjected to an esterification reaction;

[0019] (2) under vacuum conditions, the esterification reaction mixture gained in step (1) is prepolymerized;

[0020] (3) In the presence of a rare earth metal catalyst, the prepolymerization reaction mixture obtained in step (2) is subjected to polycondensation reaction to obtain the product of an aliphatic-aromatic copolymer, wherein, in the aliphatic-aromatic copolymer In the product, the content of the titanium-based catalyst is 0.04-0.08% by weight, and the content of the rare earth metal catalyst is 0.022-0.1% by weight;

[0021] (4) Copolymerize the product of the aliphatic-aromatic copolymer obtained in step (3) with the lactide monomer, wherein the amo...

preparation example 1

[0062] Dissolve 10g of lanthanum oxide with excess hydrochloric acid, add 0.5g of NH after heating and concentrating 4 Cl, carefully heated to remove excess HCl, the obtained solid was dried, and then added to a quartz sublimation tube, and the solid obtained by vacuum sublimation was lanthanum chloride.

preparation example 2

[0064]Dissolve 9.37 mmol of lanthanum chloride in 50 mL of water, add to an aqueous solution containing 56.2 mmol of acetylacetone, stir at room temperature, and adjust the pH to neutral by adding an aqueous solution of 2N KOH. The reaction mixture was stirred, filtered, and dried under vacuum at 60° C. to obtain 4 g of lanthanum acetylacetonate.

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Abstract

The invention discloses a method for preparing an aliphatic-aromatic-polylactic acid copolyester product. The method controls the content of a titanium-based catalyst and a rare-earth metal catalyst to prepare aliphatic-aromatic polylactic acid with a low content of a rare-earth-titanium-based catalyst. The product of the aliphatic-aromatic copolymer, and then the polymerization of the aliphatic-aromatic-polylactic acid copolyester product is initiated by the product of the aliphatic-aromatic copolymer. The present invention also provides the aliphatic-aromatic-polylactic acid copolyester product prepared by the above method. The aliphatic-aromatic-polylactic acid copolyester product of the present invention has low metal content, thus has high safety in use, and has high flexibility, which overcomes the original brittle defect of polylactic acid.

Description

technical field [0001] The invention relates to a flexible aliphatic-aromatic-polylactic acid copolyester product and a preparation method thereof. Background technique [0002] It is well known that polylactic acid is a kind of green polymer material. Due to its biological origin, the vigorous development of polylactic acid industry can reduce the pressure on petrochemical resources, and it is also beneficial to alleviate the greenhouse effect. However, the properties of polylactic acid materials are brittle and insufficient in toughness, so toughening polylactic acid is an important direction to improve the performance of polylactic acid. Among them, chain extension of polylactic acid is one of the methods to improve the toughness of polylactic acid. However, most of the current chain extenders contain isocyanate or epoxy components, which may produce toxic and harmful substances during the degradation process of the material, which is not conducive to the large-scale app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/183C08G63/85C08G63/84
Inventor 许宁计文希祝桂香韩翎张伟
Owner CHINA PETROLEUM & CHEM CORP
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