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Polylactic acid block polymer and preparation method thereof

A technology of block copolymer and polylactic acid, which is applied in the field of polylactic acid block copolymer and its preparation, can solve the problems of limited application scope and wide molecular weight distribution of polymers, and achieve a clear structure, narrow molecular weight distribution and mild conditions. Effect

Active Publication Date: 2012-12-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The elongation at break of the polymer can reach 364.35%, but the toxicity of diisocyanate limits the application range of the product, and the obtained polymer has a wide molecular weight distribution

Method used

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  • Polylactic acid block polymer and preparation method thereof
  • Polylactic acid block polymer and preparation method thereof
  • Polylactic acid block polymer and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a preparation method of polylactic acid block copolymer, comprising the following steps: mixing poly(adipic acid-terephthalic acid) butanediol copolyester, lactide and the first catalyst, heating To the molten state, after the reaction, the polylactic acid block copolymer with the structure of formula (I) is obtained. The polylactic acid block copolymer with the structure of formula (I) is the same as described above, and will not be repeated here.

[0034] The mass ratio of lactide and poly(adipic acid-terephthalic acid) butanediol copolyester described in the present invention is (1:9)~(9:1), preferably (1:1)~ (6:1), more preferably (1.5:1)~(4:1), more preferably (1.5:1)~(3:1). Poly(adipic acid-terephthalic acid) butanediol copolyester has good flexibility, and the ring-opening polymerization of lactide to form a block copolymer can make up for the lack of flexibility and elasticity of polylactic acid.

[0035] The mass of the fir...

Embodiment 1

[0052] Under the condition of nitrogen protection, 83g of terephthalic acid, 73g of adipic acid, 90g of butanediol and 0.1g of tetrabutyl titanate were added to the reaction kettle with mechanical stirring, and the temperature was raised to 140°C under normal pressure. Carry out the esterification reaction, distill off the water until the theoretical water output is reached; then raise the temperature to 210°C, gradually reduce the pressure to a high vacuum state and the pressure is 100Pa, carry out the polycondensation reaction, set the stirring voltage to 120V, record the number of revolutions of the stirrer until the stirring The number of revolutions is no longer reduced to a fixed value, and the obtained; lower the temperature to 120°C, add 700g of dried lactide and 0.7g of stannous octoate, react for 12h, blow nitrogen to devolatilize, extrude and granulate, and obtain the formula (I) Structure of polylactic acid block copolymer, the relative number average molecular weig...

Embodiment 2

[0057] Under the condition of nitrogen protection, 83g of terephthalic acid, 73g of adipic acid, 90g of butanediol and 0.1g of tetrabutyl titanate were added to the reaction kettle with mechanical stirring, and the temperature was raised to 140°C under normal pressure. Carry out the esterification reaction, distill off the water until the theoretical water output is reached; then raise the temperature to 210°C, gradually reduce the pressure to a high vacuum state and the pressure is 100Pa, carry out the polycondensation reaction, set the stirring voltage to 120V, record the number of revolutions of the stirrer until the stirring The number of revolutions does not decrease any more and reaches a fixed value; lower the temperature to 120°C, add 460g of dried lactide and 0.46g of stannous octoate, react for 12 hours, pass nitrogen gas to devolatilize, extrude and granulate, and obtain the formula (I) The polylactic acid block copolymer has a relative number average molecular weigh...

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Abstract

The invention provides a polylactic acid block polymer and a preparation method thereof. The preparation method comprises the following steps: mixing poly(adipic acid-terephthalic acid)butanediol copolyester, lactide and a first catalyst, and heating to a molten state to react, thereby obtaining the polylactic acid block polymer disclosed as Formula (I). Compared with the polymer obtained by the PLA-PBAT chain extension reaction initiated by diisocyanate in the prior art, the invention uses the molten-state poly(adipic acid-terephthalic acid)butanediol copolyester as the reactant to directly initiate the ring-opening polymerization of lactide, and the polymerization method is mass polymerization without adding the chain extender diisocyanate or any organic solvent, thereby avoiding jeopardizing the human body and environment; the raw materials can be mixed and heated to react to obtain the polylactic acid block polymer, so that the preparation method is simpler and lowers the preparation cost; and the polylactic acid block polymer provided by the invention has definite structure and narrow molecular weight distribution.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polylactic acid block copolymer and a preparation method thereof. Background technique [0002] Plastic products are indispensable in people's lives, but traditional plastic products generally take hundreds of years or even longer to degrade completely, resulting in serious "white pollution"; at the same time, traditional plastic raw materials are derived from petroleum and other unavailable Renewable resources, with the depletion of petrochemical resources, the traditional plastic industry is also threatened. Therefore, vigorously developing environmentally friendly biodegradable polymers to replace petroleum-based plastic products has become a hot spot in current research and development. [0003] Among them, polylactic acid (PLA) is a very important biodegradable plastic. It is a new type of biodegradable polymer material chemically synthesized from lactic acid extracted fr...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08G63/78
Inventor 陈学思张宝李杲庄秀丽边新超孙敬茹
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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