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Flexible aliphatic-aromatic-polylactic acid copolymer ester 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: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Flexible aliphatic-aromatic-polylactic acid copolymer ester 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 4Cl, 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 2NKOH. 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 preparation method of a flexible aliphatic-aromatic-polylactic acid copolymer ester product. In the method, by means of control on contents of a titanium-series catalyst and a rare earth metal catalyst, an aliphatic-aromatic copolymer product being low in rare earth / titanium-series catalyst content is produced; and then polymerization of the flexible aliphatic-aromatic-polylactic acid copolymer ester product is initiated through the aliphatic-aromatic copolymer product. The invention also provides the flexible aliphatic-aromatic-polylactic acid copolymer ester product prepared through the method. The flexible aliphatic-aromatic-polylactic acid copolymer ester product is low in metal content, has high use safety, is high in flexibility and overcomes a defect of brittleness 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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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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