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Polylactic acid degradable thin film and preparation method thereof

A technology for degrading film and polylactic acid, which is applied in the field of polylactic acid degradable film and its preparation, can solve the problems of limited application and low elongation of polylactic acid, so as to improve mechanical properties, increase elongation at break, and ensure tensile strength intensity effect

Active Publication Date: 2019-01-04
WUJIANG BODA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the elongation of polylactic acid is very low, which limits its application in mechanical aspects.

Method used

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  • Polylactic acid degradable thin film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A polylactic acid degradable film, the following components are weighed by weight: 70 parts of polylactic acid resin, 20 parts of polybutylene carbonate, 5 parts of tea polyphenol, ε-caprolactone / trimethylene carbonate / lactate 20 parts of ester copolymer, 12 parts of viscose solution, 2 parts of antioxidant, 10 parts of acetyl tributyl citrate, 20 parts of nano-hydroxyapatite, wherein, the degree of esterification of cellulose in viscose solution is 45%, The viscosity is 40s;

[0021] The above-mentioned preparation method of a polylactic acid degradable film is prepared by the following method:

[0022] S1. Dry the polylactic acid resin in vacuum at 80 °C for 4 h;

[0023] S2. Then the dry polylactic acid resin is melt blended with polybutylene carbonate, tea polyphenol, ε-caprolactone / trimethylene carbonate / lactide copolymer, antioxidant and acetyl tributyl citrate Knead into a block material, the mixing temperature is 160 ° C, and the time is 6 minutes;

[0024] S...

Embodiment 2

[0027] A polylactic acid degradable film, the following ingredients are weighed by weight: 90 parts of polylactic acid resin, 10 parts of polybutylene carbonate, 15 parts of tea polyphenol, ε-caprolactone / trimethylene carbonate / lactate 30 parts of ester copolymer, 20 parts of viscose solution, 6 parts of antioxidant, 5 parts of acetyl tributyl citrate, 10 parts of nano halloysite, wherein, the degree of esterification of cellulose of viscose solution is 50%, the viscosity for 40s;

[0028] The above-mentioned preparation method of a polylactic acid degradable film is prepared by the following method:

[0029] S1. Dry the polylactic acid resin in vacuum at 80 °C for 4 h;

[0030] S2. Then the dry polylactic acid resin is melt blended with polybutylene carbonate, tea polyphenol, ε-caprolactone / trimethylene carbonate / lactide copolymer, antioxidant and acetyl tributyl citrate Knead into a block material, the mixing temperature is 180°C, and the time is 2min;

[0031] S3. add vi...

Embodiment 3

[0034] A polylactic acid degradable film, the following components are weighed by weight: 75 parts of polylactic acid resin, 16 parts of polybutylene carbonate, 7 parts of tea polyphenols, ε-caprolactone / trimethylene carbonate / lactate 22 parts of ester copolymers, 15 parts of viscose solution, 3 parts of antioxidant, 6 parts of acetyl tributyl citrate, 12 parts of nanometer white carbon black, wherein, the degree of esterification of the cellulose of viscose solution is 46%, the viscosity is 42s;

[0035] The above-mentioned preparation method of a polylactic acid degradable film is prepared by the following method:

[0036] S1. Dry the polylactic acid resin in vacuum at 80 °C for 4 h;

[0037] S2. Then the dry polylactic acid resin is melt blended with polybutylene carbonate, tea polyphenol, ε-caprolactone / trimethylene carbonate / lactide copolymer, antioxidant and acetyl tributyl citrate Knead into a block material, the mixing temperature is 168 ° C, and the time is 3 minute...

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Abstract

The invention provides a polylactic acid degradable thin film and a preparation method thereof. The method comprises the following steps that S1, polylactic acid resin is dried in a vacuum; S2, driedpolylactic acid resin, poly(butylene carbonate), tea polyphenol, epsilon-caprolactone / trimethylene carbonate / lactide copolymer, antioxidant and acetyl tributyl citrate are melted and mixed to be block-shaped materials; S3, a viscose solution and inorganic filler are added for secondary mixing; S4, the mixed block-shaped materials are put into a twin-screw extruder to be processed, and the finishedproduct thin film is obtained through longitudinal stretching and transverse stretching. Accordingly, by means of blending of organic polymer compounds with different ingredients, and the mechanicalproperty of the thin film is guaranteed; meanwhile, filler rich in hydroxyl is added, the filler and PLA molecules can form powerful hydrogen bonds, the mechanical strength of a filler system is high,by cooperating with a stretching technology, the polymer compounds are arranged orderly, and the mechanical property is improved conveniently.

Description

technical field [0001] The invention relates to a degradable packaging film, in particular to a polylactic acid degradable film and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a renewable polymer. It has good physical properties and processing properties, and has good degradation properties. The discarded polylactic acid can be degraded into carbon dioxide and water, which is non-toxic to the human body and has no pollution to the environment. Therefore, it has become a research hotspot of renewable and environmentally friendly materials. Due to the high production cost of PLA, research on PLA in packaging has been focused on high-performance films, rigid thermoforming, food and beverage containers, and coated paper. Recently, due to the increase in the price of traditional petroleum-derived polymer raw materials and the decline in the price of industrial-grade polylactic acid brought about by the upgrading of production processes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L69/00C08L1/24C08K13/02C08K5/11C08K5/1545C08K3/32C08J5/18
CPCC08J5/18C08J2367/04C08J2401/24C08J2467/04C08J2469/00C08K3/32C08K5/11C08K5/1545C08K13/02
Inventor 王晚秀
Owner WUJIANG BODA ELECTRONICS TECH