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Method for rapidly degrading polylactic acid

A rapid degradation, polylactic acid technology, applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of non-degradable or slow-degradable general-purpose plastics, long-term removal or degradation, uncontrollable degradation speed, etc., to achieve accelerated degradation, Ease of implementation and low cost

Inactive Publication Date: 2019-04-12
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The emergence of disposable tableware and plastic bags has greatly facilitated people's daily life, but the raw materials for making disposable plastic products are generally non-degradable or very slow-degradable general-purpose plastics, and the degradation rate is uncontrollable, making it convenient for people. While living, it has caused serious white pollution to the environment
In addition, biomedical polymer materials are flourishing as a branch of functional polymer materials, and are widely used in tissue engineering materials, human organs, and drug-controlled release materials. Degradation, which causes greater pain or damage to the human body

Method used

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  • Method for rapidly degrading polylactic acid
  • Method for rapidly degrading polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The preparation of rapidly degrading polylactic acid, get a certain amount of polylactic acid (L-polylactic acid pellets, melt index is 5.6g / 10min, 190 ℃) and ferric chloride, dry 12h in the vacuum oven of 60 ℃ Finally, weigh 100g of dry polylactic acid and pre-mix 3g of ferric chloride; then add the mixture into the material chamber of the internal mixer, and set the temperature as: 185°C in the first zone, 185°C in the second zone, 190°C in the third zone, and the rotor Rotational speed: 80 rpm, after 10 minutes of reaction, the material is discharged, and crushed in a powerful crusher to obtain a polylactic acid modified material.

Embodiment 2

[0019] Embodiment 2: the preparation of rapidly degrading polylactic acid, get a certain amount of polylactic acid (L-polylactic acid pellets, melt index is 5.6g / 10min, 190 ℃) and zinc chloride, dry 12h in the vacuum oven of 60 ℃ Then take 100g of dry polylactic acid and pre-mix 2g of zinc chloride (2 parts). Then add the mixture into the material chamber of the internal mixer, set the temperature as: 185°C in the first zone, 185°C in the second zone, and 190°C in the third zone, the rotor speed: 80 rpm, and leave after 2 minutes of reaction. Crushing in the machine to obtain polylactic acid modified materials.

Embodiment 3

[0020] Embodiment 3: the preparation of rapidly degrading polylactic acid, get a certain amount of polylactic acid (L-polylactic acid pellets, melt index is 5.6g / 10min, 190 DEG C) and calcium chloride, dry 12h in the vacuum oven of 60 DEG C Then weigh 100g of dry polylactic acid and premix 3g (3 parts) of calcium chloride. Then the mixture was added to the material chamber of the internal mixer, the temperature was set as: 185°C in the first zone, 185°C in the second zone, 190°C in the third zone, the rotor speed: 80 rpm, and the material was discharged after 7 minutes of reaction. Crushing in a powerful crusher to obtain polylactic acid modified materials.

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Abstract

The invention discloses a method for rapidly degrading polylactic acid. According to the invention, a metal chloride having coordination function with polylactic acid is taken as a promoter, and by using coordination between the metal chloride and an ester group of the large molecular polyactic acid, the ester group is activated, the hydroge bond association between the polylactic acid molecules is weakened, the molecules are activated, and thus the method for rapidly degrading polylactic acid is obtained. Degradation test results by an alkaline aqueous solution and high-energy ultraviolet light show that the degradation rate of polylactic acid can be significantly improved after the metal chloride having coordination function with polylactic acid is added into polyactic acid. Through thetechnical scheme, the degradation rate of the polylactic acid material is greatly accelerated, the degradation rate of polylactic acid can be regulated and controlled by controlling the content of chlorates, degradation products can be analyzed and measured, and the method has no pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a method for rapidly degrading polylactic acid. Background technique [0002] The emergence of disposable tableware and plastic bags has greatly facilitated people's daily life, but the raw materials for making disposable plastic products are generally non-degradable or very slow-degradable general-purpose plastics, and the degradation rate is uncontrollable, making it convenient for people. While living, it has caused serious white pollution to the environment. In addition, biomedical polymer materials are flourishing as a branch of functional polymer materials, and are widely used in tissue engineering materials, human organs, and drug-controlled release materials. Degradation, which brings greater pain or damage to the human body. Under such circumstances, it is urgent to develop fast and efficient degradable materials to solve this problem. [0003] Biodegradable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/16C08L67/04
CPCC08J11/16C08J2367/04Y02W30/62
Inventor 罗筑李小龙
Owner GUIZHOU UNIV
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