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Method for preparing L-lactic acid and amino acid copolymer by melt-solid phase condensation polymerization

A technology of amino acids and copolymers, which is applied in the field of modified polylactic acid and its preparation, can solve the problems of high cost and complicated process, and achieve the effect of convenient operation, simple process and widening application fields

Inactive Publication Date: 2008-07-23
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Professor Bmera of the Massachusetts Institute of Technology synthesized lactic acid / lysine copolymer (PLAL), Chinese patent CN03135454.8 discloses lactic acid / amino acid ester blends and a preparation method thereof, and Chinese patent CN1435438A discloses the synthesis of diamine-modified polylactic acid The preparation method, the performance of the polymer prepared by the above method has been improved to a certain extent, but there are problems of complicated process and high cost

Method used

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  • Method for preparing L-lactic acid and amino acid copolymer by melt-solid phase condensation polymerization
  • Method for preparing L-lactic acid and amino acid copolymer by melt-solid phase condensation polymerization
  • Method for preparing L-lactic acid and amino acid copolymer by melt-solid phase condensation polymerization

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Experimental program
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Effect test

Embodiment 1

[0025] Measure 700mL 85% L-lactic acid (Purac company product) in a 1000mL single-necked round bottom flask, place the flask on a rotary evaporator, the rotating speed of the rotary evaporator is 200rpm / min, heat in an oil bath at 130°C, and gradually reduce the pressure to a pressure less than 1.0×10 -3 MPa, continue dehydration for 4h and then stop. Fill with nitrogen to relieve the pressure, add 0.5% stannous octoate and 0.5% 6-aminocaproic acid after dehydration of the L-lactic acid mass, the temperature of the oil bath is raised to 180°C, the rotating speed of the rotary evaporator is still 200rpm / min, and the pressure is reduced gradually until the pressure is less than 5.0×10 -4 MPa, after 10 hours of reaction, add 0.5% stannous octoate, continue the reaction for 0.5 hours, finish the reaction and pour it into a stainless steel plate.

[0026] The above-mentioned prepolymer is pulverized and placed in a vacuum drying oven, and then put into 5 times the mass of the p...

Embodiment 2

[0030] The preparation of L-lactic acid prepolymer, and the condition of solid-phase polymerization are the same as embodiment 1,3-aminopropionic acid replaces 6-aminocaproic acid, and GPC method records the M of copolymer w 53,000.

Embodiment 3

[0032] The preparation of L-lactic acid prepolymer, and the condition of solid-phase polymerization are with embodiment 1,4-aminobutyric acid replaces 6-aminocaproic acid, and GPC method records the M of copolymer w to 56,000.

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Abstract

The invention discloses a melt-solid phase polycondensation preparation new type biodegradation material containing hydrogen bond poly lactic acid-L-lactic acid and amino acid copolymer method. It includes the following steps that the first is melt polycondensation; the raw material L-lactic acid is decompression dehydration, added into amino acid, catalyst to do condensation and polymerization. The second is solid phase polymerization; pre-polymer is crashed, and to do solid phase polymerization at the condition of molecular sieve existence. Because of the whole technique does not use solvent, the lactic acid and amino acid with higher molecular weight can be made with low cost.

Description

technical field [0001] The invention relates to a polymer material and a preparation method thereof, in particular to a modified polylactic acid and a preparation method thereof. Background technique [0002] With the development of science and society, people pay more and more attention to environmental and resource issues and become global issues. Petroleum-based plastic materials are widely used, and such materials are difficult to recycle after use, resulting in a relatively serious "white pollution" problem; moreover, resources such as petroleum are non-renewable, and a large number of unreasonable uses have brought great harm to human beings. There is a serious shortage of resources. The emergence of degradable materials, especially the recyclability of raw materials for degradable materials, provides an effective means to solve this problem. Polylactic acid (PLA) is a degradable material that has been researched and applied relatively more at present. It is an envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/06C08G63/80C08G69/08
Inventor 刑云杰袁茂全徐洁茅惠萍
Owner SHANGHAI CHLOR ALKALI CHEM
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