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Polylactic acid copolymer and preparation method thereof

A technology of polylactic acid copolymer and lactic acid monomer, which is applied in the field of polylactic acid copolymer and its preparation, can solve the problems of difficulty in the preparation of copolymers, achieve the effects of increasing the glass transition temperature, increasing the application range, and improving poor heat resistance

Inactive Publication Date: 2013-06-05
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that the copolymer with high glass transition temperature of lactic acid as the main component is difficult to prepare, the present invention provides a heat-resistant polylactic acid copolymer with high glass transition temperature and molecular weight and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After injecting 100 g of a 90 wt % L-lactic acid aqueous solution into a 250 mL three-necked flask, the flask was placed in an oil bath. Install a stirrer on the three-necked flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace it with nitrogen three times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add Oxalic acid 0.9g, isosorbide 0.146g, propanedisulfonic acid 30mg. Then the temperature of the system is gradually raised from 90°C to 180°C within 2 hours, the pressure is reduced to 0.2KPa within 2 hours, then the pressure is kept at 0.2KPa, the temperature is raised to 200°C, melted and polymerized for 5 hours, a...

Embodiment 2

[0038] After pouring 101 g of 90 wt % L-lactic acid aqueous solution into a 250 mL three-necked flask, the flask was placed in an oil bath. Install a stirrer on the three-necked flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace it with nitrogen three times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add Oxalic acid 45g, isosorbide 73g, antimony oxide 25mg. Then the temperature of the system is gradually increased from 90°C to 180°C within 20 hours, the pressure is reduced to 0.2KPa within 20 hours, and then the pressure is kept at 0.1KPa, the temperature is raised to 240°C for 30 hours, and the copolymerization produc...

Embodiment 3

[0042] After injecting 100 g of a 90 wt % L-lactic acid aqueous solution into a 250 mL three-necked flask, the flask was placed in an oil bath. Install a stirrer on the three-necked flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace it with nitrogen three times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add Oxalic acid 30g, isophthalic acid 27.7g, isosorbide 73g, isopropyl titanate 100mg. Then the temperature of the system is gradually increased from 90°C to 180°C within 20 hours, the pressure is reduced to 0.2KPa within 20 hours, and then the pressure is kept at 0.1KPa, the temperature is raised to 230°C for melt pol...

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Abstract

The invention discloses a polylactic acid copolymer. The polylactic acid copolymer contains an oxalic acid monomer unit and a cyclic structural dihydric alcohol monomer unit, the mole percentage composition of a lactic acid monomer unit in the whole copolymer monomer unit is X, wherein the X is bigger than 50% and smaller than 100%. The invention further provides a preparation method of the polylactic acid copolymer, a lactic acid monomer and a copolymer monomer serve as the major materials, by means of the existing of catalyst, the polylactic acid copolymer is prepared, wherein the mole ratio of the lactic acid monomer in the whole monomers is bigger than 50% and smaller than 100%, and the copolymer monomer contains an oxalic acid monomer or an oxalic acid derivative monomer, a cyclic structural dihydric alcohol monomer or dihydric alcohol derivative monomer. The preparation method of the polylactic acid copolymer is simple in technology, the entire bio-source of the prepared polylactic acid copolymer has high molecular weight, at the same time the glass-transition temperature is increased greatly, the application range of the preparation method is enlarged, especially in the packaging field, and the preparation method of the polylactic acid copolymer can be widely used in the packaging field which has high heat-resistant requirements.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polylactic acid copolymer and a preparation method thereof. Background technique [0002] In the 21st century, environmental pollution and resource shortages have become global problems, and they are getting more and more attention. Synthetic polymer materials using petroleum as raw materials are widely used and have made important contributions to the development of human civilization. However, such materials are difficult to recycle after use, causing serious "white pollution" problems; on the other hand, petroleum is a non-renewable resource, and the increasing consumption of petroleum has caused human beings to face serious resource shortages. It is expected that the development and application of degradable plastics, especially degradable materials derived from renewable resources, can greatly alleviate these two problems in the near future. [0003] Polylact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/82
Inventor 叶子浓任妍虹何勇
Owner TORAY FIBER RES INST(CHINA) CO LTD
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