Polylactic acid/starch biologic degradable composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of polylactic acid/starch biodegradable composite material and its preparation, can solve the problems of cumbersomeness, limited effect of improving compatibility, performance degradation, etc., and achieve less environmental pollution and easy Industrialized large-scale production and high production efficiency

Active Publication Date: 2014-03-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of glycerol in the MA-g-PLA / GTPS composite material will promote the degradation of PLA, resulting in a decline in the performance of the MA-g-PLA / GTPS composite material in a certain period of time (Michel A et al.Polymer.2007 ,48,270-280)
[0006] Another traditional method to change the compatibility and mechanical properties of PLA / starch composites is to add coupling agents such as toluene diisocyanate, acrylic acid, maleic anhydride and other small molecule coupling agents to improve the compatibility of PLA / starch to improve The performance of PLA / starch composites, but these small molecule coupling agents have limited effect on improving compatibility and generally starch needs to be modified to improve its reactivity with coupling agents, these procedures are cumbersome and inhibit PLA / starch composites in film and its application in tableware

Method used

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  • Polylactic acid/starch biologic degradable composite material and preparation method thereof
  • Polylactic acid/starch biologic degradable composite material and preparation method thereof
  • Polylactic acid/starch biologic degradable composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Weigh the following ingredients by weight:

[0064] Corn starch (dried to a moisture content of 4.1% by weight, Zhucheng Xingmao Corn Development Co., Ltd.) 450g, polylactic acid (Natureworks4032D, LD mixed polylactic acid) 1020g, cardanol monocyclic epoxy (Aladdin reagent) 30g , antioxidant 1010 (BASF Chemicals) 2g, lubricant epoxy soybean oil (industrial grade, Guangzhou Huihe Chemical Co., Ltd.) 5g, catalyst tetrabutylammonium bromide (Aladdin reagent) 0.5g, antihydrolysis agent TMP-2000 (Hangzhou Xusheng New Material Technology Co., Ltd.) 1g.

[0065] Preparation of polylactic acid / starch biodegradable composites:

[0066] First, 1020g of PLA, 30g of cardanol monocyclic epoxy, 450g of cornstarch and other reagents were mixed uniformly to obtain a mixed material; then the mixed material was added to a twin-screw extruder for melt blending (after mixing The materials are successively passed through the melting and blending intervals with temperatures of 160°C, 170°C...

Embodiment 2

[0068] Weigh the following ingredients by weight:

[0069] Corn starch (dried to a moisture content of 4.1% by weight, Zhucheng Xingmao Corn Development Co., Ltd.) 450g, polylactic acid (Natureworks4032D, LD mixed polylactic acid) 1005g, cardanol monocyclic epoxy (Aladdin reagent) 45g , antioxidant 1010 (BASF Chemicals) 2g, lubricant epoxy soybean oil (industrial grade, Guangzhou Huihe Chemical Co., Ltd.) 5g, catalyst tetrabutylammonium bromide (Aladdin reagent) 0.5g, antihydrolysis agent TMP-2000 (Hangzhou Xusheng New Material Technology Co., Ltd.) 1g.

[0070] Preparation of polylactic acid / starch biodegradable composites:

[0071] First, the PLA of 1005g, 45g cardanol monocyclic epoxy, 450g cornstarch and other reagents are mixed uniformly to obtain the mixed material; then the mixed material is added to the twin-screw extruder for melt blending (after mixing The materials are successively passed through the melting and blending intervals with temperatures of 160°C, 170°C...

Embodiment 3

[0073] Corn starch (dried to a moisture content of 4.1% by weight, Zhucheng Xingmao Corn Development Co., Ltd.) 450g, polylactic acid (Natureworks4032D, LD mixed polylactic acid) 990g, cardanol monocyclic epoxy (Aladdin reagent) 60g , antioxidant 1010 (BASF Chemicals) 2g, lubricant epoxy soybean oil (industrial grade, Guangzhou Huihe Chemical Co., Ltd.) 5g, catalyst tetrabutylammonium bromide (Aladdin reagent) 0.5g, antihydrolysis agent TMP-2000 (Hangzhou Xusheng New Material Technology Co., Ltd.) 1g.

[0074] Preparation of polylactic acid / starch biodegradable composites:

[0075] First, mix 990g of PLA, 60g cardanol monocyclic epoxy, 450g cornstarch and other reagents to obtain a mixed material; then add the mixed material to a twin-screw extruder for melt blending (after mixing The materials are successively passed through the melting and blending intervals with temperatures of 160°C, 170°C, 175°C, 180°C, 185°C, 175°C, 170°C, and 160°C) and then drawn into strands and pell...

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Abstract

The invention discloses a polylactic acid / starch biologic degradable composite material which is prepared from the following components in percentage by weight: 30-94% of polylactic acid, 0.1-10% of phenol epoxy compounds, 5-60% of natural starch, 0-1% of an antioxidant, 0-5% of a lubricant, 0-1% of a catalyst and 0-1% of a hydrolysis resisting agent. The composite material is safe and non-toxic, biodegradable and excellent in mechanical performance. The invention further discloses a preparation method of the polylactic acid / starch biologic degradable composite material. The preparation method comprises the following steps: uniformly mixing the polylactic acid, the phenol epoxy compounds, the natural starch and various assistants; then, adding the mixed materials into a phenol epoxy compounds for melt blending; then, bracing and dicing; and drying to obtain the polylactic acid / starch biologic degradable composite material. The preparation method is simple, easy to control and implement, strong in operability and low in production cost, and the prepared composite material can be applied to the fields of thin films and disposable tableware and the like.

Description

technical field [0001] The invention relates to the field of polylactic acid / starch composite material and its preparation, in particular to a polylactic acid / starch bio-degradable composite material and a preparation method thereof. Background technique [0002] In recent years, traditional petrochemical-based plastics are gradually being replaced by degradable and reusable bio-based materials called "green materials". The most important and widely used degradable polymers are aliphatic polyesters and proteins, such as polylactic acid (PLA), poly(3-hydroxybutyrate), poly(ε-caprolactone), starch and so on. Among many biodegradable materials, PLA is the most promising because of its good mechanical properties (especially strength and modulus), easy processing and excellent degradability. Biodegradable PLA is a polymer of lactic acid, which is generally prepared by ring-opening polymerization of cyclic lactide dimers. At present, NatureWorks in the United States, Mitsui Chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08K5/1515C08K5/13C08K5/19
Inventor 汤兆宾熊竹朱锦李鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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