Method for producing poly-lactic acid products

A production method, polylactic acid technology, applied in the field of polylactic acid production, can solve the problems of reduced flexibility, production knocking, PLA difficulties, etc., and achieve the effect of solving the service life problem, increasing the service life, and cheap price

Inactive Publication Date: 2009-09-09
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increasing consumption of plastics in the world, two serious problems have emerged in the development of plastics: 1. A large amount of waste plastics put great pressure on the environment; Plastic production rings alarm bells
[0004] However, there are still great difficulties in using PLA in thin films: because PLA has great brittleness, if you want to make PLA into thin films and have great toughness, you must improve the toughness of PLA; if you want to improve the toughness of PLA, you must Modulation by additives
[0005] At present, many scholars and experts have also used many additives to improve the toughness of PLA. For example, Ljungberg et al. used triethylglyceride and tributyl citrate to plasticize PLA, but the film made in this way is prone to continuous cooling during use. Crystallization, which forces the plasticizer to migrate to the surface of the film, causing the properties of the film to change rapidly over time, and ultimately the flexibility is greatly reduced
Yue et al. used blending to improve the toughness of PLA. They studied the blending of polylactic acid and polyethylene oxide / polyethylene glycol, but the performance of the blend was not ideal.
Although the blending method is relatively simple, the performance is difficult to meet the needs of industry
The Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences invented the use of triisobutylaluminum as a catalyst to prepare high molecular weight polylactic acid and polyether glycol copolymers, but in this process, a molecular weight regulator must be added, and the lactide The purity requirements are high, especially the treatment of water is quite complicated
[0006] PLA is a fully biodegradable polymer, but the product is no longer fully biodegradable due to the addition of plasticizers and regulators

Method used

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  • Method for producing poly-lactic acid products
  • Method for producing poly-lactic acid products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 58.9g of bio-PEG6000 into the cleaned test tube with a spout, then install the overlapping head, put it in a silicone oil tank at 160°C, connect and stir, adjust the stirring speed to 17rpm, and use nitrogen gas before dissolving the bio-PEG6000 Replace the reaction system repeatedly, about 3 times, then react under full vacuum for 30 minutes (the degree of vacuum is about 300Pa). Return to normal pressure and add the prepared 41.1g lactide (purac company in the Netherlands), adjust the stirring speed to 29rpm, and replace the reaction system with nitrogen for about 3 rounds, and after 10 minutes of reaction with nitrogen, add the catalyst iron acetylacetonate (Shanghai Sanai Si Reagent Co., Ltd.) (0.1mol / ml, 2.5ml), toluene (Jiangsu Jincheng Reagent Factory) as the solvent), continue to replace for 3 rounds, and then react under nitrogen for 2 hours, then add the deactivator phosphoric acid crystals (SIGMA -ALDRICH) (0.1mol / ml, 0.09ml) was reacted under nitrogen fo...

Embodiment 2

[0029] The experimental process and conditions were the same as in Example 1, the amount of PEG was 20g, and the amount of lactide was 80g.

Embodiment 3

[0031] The experimental process and conditions were the same as in Example 1, the amount of PEG was 80g, and the amount of lactide was 20g.

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Abstract

The invention discloses a method for producing poly-lactic acid products. The method comprises the following steps that in the presence of catalyst, a lactide open loop is copolymerized with PEG to form a PLA-PEG-PLA copolymer, and the copolymer is co-mixed with the PLA to obtain the poly-lactic acid plasticized products. The PEG is prepared by the polymerization of ethylene glycol and ethylene oxide in which the carbon elements are sourced from biological materials, the stretch modulus of the poly-lactic acid film product at a temperature of 23 DEG C is between 0.1 and 2 Gpa, and the carbon elements of the compositions of poly-lactic acid are completely sourced from the biological materials.

Description

Technical field: [0001] The invention relates to a production method of polylactic acid. technical background: [0002] With the increasing consumption of plastics in the world, two serious problems have emerged in the development of plastics: 1. A large amount of waste plastics put great pressure on the environment; The production of plastics has sounded alarm bells. [0003] Polylactic acid (PLA) is readily biodegradable into CO under the regulation of aerobic and water 2 and H 2 O, and the raw material of PLA is from the annual plant corn, so the discovery of PLA has completely solved the two fatal problems encountered by the plastic industry, so the application of PLA will definitely replace the application of plastic in some aspects. [0004] However, there are still great difficulties in using PLA in thin films: because PLA has great brittleness, if you want to make PLA into thin films and have great toughness, you must improve the toughness of PLA; if you want to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/82C08L67/04
Inventor 李波邹美华李旭本田圭介
Owner TORAY FIBER RES INST(CHINA) CO LTD
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