Coupling and capacity increasing technique for coblended interface of biodegradation polylactic acid/starch composite material

A composite material and biodegradable technology, which is applied in the field of coupling and compatibilization of the blending interface, can solve the problems of affecting the mechanical properties of starch-filled polylactic acid materials, high cost and poor compatibility, and achieve excellent processing performance and process Simple, high mechanical strength and effect on modulus and toughness

Inactive Publication Date: 2009-02-18
袁明龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bio-based polylactic acid plastic is a completely biodegradable material, but its high cost limits its application. Combining starch with polylactic acid to reduce resource costs is an effective method
Since the starch molecule contains a large number of hydroxyl groups, the hydrogen bonds between the molecules and the molecules are strong, making the structure compact, and there is no interactive functional group between the hydrophobic polylactic acid and the hydrophilic starch, which leads to the mutual interaction between them. The capacity is very poor, so that it seriously affects the mechanical properties of starch-filled polylactic acid materials, and the application of this polylactic acid / starch composite material is also greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Premix 70 parts of poly-L lactic acid (molecular weight: 300,000), 20 parts of tapioca starch, and 10 parts of partially hydrolyzed polyvinyl acetate (hydrolysis degree 30-70%) with a high-speed mixer for 1-4 minutes, and then pass the mixture through a twin-screw The extruder can extrude and granulate. The temperature setting of the extruder is: 70°C in the feeding section, 220°C in the mixing section, 215°C in the head, and 20-80rpm of the screw speed. The yield strength of the obtained material is 23.4Mpa, the Young's modulus is 1342Mpa, and the impact strength is 13.6JK / M 2 . This material can be used in the preparation of tableware, drinking utensils, cups and other disposable containers.

Embodiment 2

[0036]60 parts of poly DL-lactic acid (600,000), 20 parts of tapioca starch, and 20 parts of tapioca starch-grafted polylactic acid (grafting rate 5%) were premixed with a high-speed mixer for 1 to 4 minutes, and then the mixture was extruded by a twin-screw. It can be extruded out of the machine and granulated. The temperature setting of the extruder is: 70°C in the feeding section, 220°C in the mixing section, 215°C in the head, and 20-80rpm of the screw speed. The yield strength of the obtained material is 23.9Mpa, the Young's modulus is 1592Mpa, and the impact strength is 8.3JK / M 2 . This material can be used to prepare hygienic containers for packaging of oil products, cosmetics, medicines and food products.

Embodiment 3

[0038] First, heat and mix 100 parts of tapioca starch and 10 parts of 10% γ-aminopropyltriethoxysilane (KH-550) ethanol solution with a high-speed mixing agent for 15 minutes to obtain surface-modified starch, which is set aside.

[0039] Premix 70 parts of poly L-lactic acid (molecular weight: 100,000), 25 parts of the above-mentioned modified tapioca starch and 5 parts of polyethylene oxide (molecular weight: 800) with a high-speed mixer for 1 to 4 minutes, and then extrude the mixture through a twin-screw Machine extrusion granulation can be. The temperature setting of the extruder is: 70°C in the feeding section, 220°C in the mixing section, 215°C in the head, and 20-80rpm of the screw speed. The yield strength of the obtained material is 18.2Mpa, the Young's modulus is 1072Mpa, and the impact strength is 11.4JK / M 2 . This material can be used to prepare disposable packaging boxes, trays, covers, films or bags for vegetables, meat, fruits and daily necessities.

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Abstract

The invention relates to a fully biologically degradable poly lactic acid / starch composite material, the composite material is composed of PLA (poly lactic acid) and the polymer thereof, starch, surfactant and coupling agent or compatibilizer and processing agent. The contents of the components are: 10-80 percent of PLA, 10-80 percent of starch, 0-3 percent of coupling agent, 2-20 percent of compatibilizer and 0.05-5 percent of processing agent. The surfactant, coupling agent and compatibilizer which have feature structures can change the dispersion of starch in the PLA, adjust and enhance the interphase compatibility of the PLA-starch blend system, strengthen the interaction among the composing substances, enhance the stability of the structure of PLA-starch interface blend, improve the mechanical performance of the composite material and the processing performance. The fully biologically degradable poly lactic acid / starch composite material can be used to produce panels, vessels, blank sheets, film, bands, wires and other products in particular shapes by injection moulding, extrusion moulding, press moulding, blow moulding, hot moulding, and the like, and the material is extensively applied to the fields of packaging, agricultural film, domestic and medical products, and the like.

Description

technical field [0001] The invention relates to a fully biodegradable high molecular polymer—a thermoplastic environment-friendly composite material composed of polylactic acid and starch, in particular to the coupling and compatibilization technology of the blend interface of the composite material. Background technique [0002] Plastic products based on petroleum resources have been widely used in various fields of people's production and life, but petroleum resources are non-renewable resources, and a large number of discarded plastic products have brought "white pollution" and seriously polluted the environment because of their non-degradability. Developing starch series renewable resources and replacing plastics based on petroleum resources with biodegradable materials is the future development direction. Bio-based polylactic acid plastic is a completely biodegradable material, but its high cost limits its application. Combining starch with polylactic acid to reduce res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/04C08K5/524B29C47/36C08K3/00C08K5/00B29C48/40
CPCB29C47/40B29C47/0038B29C47/0021B29C48/08B29C48/001B29C48/40
Inventor 袁明龙刘军王贵恒申开智邓先模
Owner 袁明龙
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