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High-starch-content waterproof totally-decomposed composite material and preparation method thereof

A composite material, fully degradable technology, applied in the field of high starch content water-resistant fully degradable composite materials and its preparation, can solve the problems of less environmental pollution, difficult plasticization, insufficient toughness, etc.

Inactive Publication Date: 2013-09-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although starch has been widely used in many fields such as papermaking, textile, medicine, petroleum, food and fermentation industries, starch is a rigid natural polymer material containing polyhydroxyl groups, and its defects such as difficult plasticization and low strength after moisture absorption have always hindered the development of starch materials. wider application of
Since the 1970s, people have blended starch and synthetic plastics to develop a series of degradable plastic products. Among them, starch is mostly used as a filler to reduce costs. It exists as a filler to reduce costs. Since this type of plastic cannot be completely degraded, it is of little significance to solve environmental pollution.
[0005] However, although the starch / polylactic acid blend composite material has certain compatibility, it cannot be fully compatible, and the composite material has low elongation at break and insufficient toughness.

Method used

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  • High-starch-content waterproof totally-decomposed composite material and preparation method thereof
  • High-starch-content waterproof totally-decomposed composite material and preparation method thereof
  • High-starch-content waterproof totally-decomposed composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Material provided by the invention is formulated by weight ratio by following raw materials:

[0022]

[0023] First, mix the nano-silica and polypropylene glycol in the above raw materials with an ultra-speed mixer, the time is 1h, and the rotation speed is 700-3000rpm, and then use an ultrasonic generator to drive out the bubbles, and the time is 1h to make a nano-sol; Nano-sol and acetate starch were mixed in a high-speed mixer for 30 minutes, and then kneaded with polyvinyl alcohol with a degree of polymerization of 1700 and an alcoholysis degree of 88% in a kneader to make a starch-based masterbatch for 10 minutes ;Finally, the starch-based masterbatch and L-polylactic acid were melt-blended through a banbury mixer, the banbury temperature was 180°C, the time was 6min, and the rotation speed was 60rpm to obtain a high-starch content water-resistant fully degradable composite material.

Embodiment 2

[0025] Material provided by the invention is formulated by weight ratio by following raw materials:

[0026]

[0027] Firstly, the nano-silica and glycerin in the above raw materials are mixed with a high-shear emulsifier for 1.5 hours at a speed of 700-3000 rpm, and then an ultrasonic generator is used to drive out the air bubbles for 1.5 hours. into a nano-sol; secondly, mix the nano-sol and acetate starch in a high-speed mixer for 30 minutes, and knead with polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 88% in a kneader to make a starch-based Masterbatch, the time is 10min; finally, the starch-based masterbatch and L-polylactic acid are melt-blended through an internal mixer, the mixing temperature is 180°C, the time is 8min, and the rotation speed is 60rpm, and the high starch content is water-resistant and fully degradable. composite material.

Embodiment 3

[0029] Material provided by the invention is formulated by weight ratio by following raw materials:

[0030]

[0031] First, mix the nano-silica and tri-n-butyl citrate in the above raw materials with an emulsification pump for 1.5 hours at a speed of 700-3000rpm, and then use an ultrasonic generator to drive out the bubbles in it for 2 hours to produce Nano sol; secondly, mix nano sol and phosphate starch in a high-speed mixer for 30 minutes, and then knead with polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 88% in a kneader to make a starch-based matrix The time is 10 minutes; finally, the starch-based masterbatch and D-polylactic acid are melt-blended through an open mill at a temperature of 190 °C for 10 minutes to obtain a high-starch content water-resistant fully degradable composite material.

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Abstract

The invention relates to a high-starch-content waterproof totally-decomposed composite material and a preparation method thereof. The method comprises the steps of: firstly dispersing nanosilicon dioxide particles in a plasticizer in advance to obtain nano sol; secondly, evenly blending the sol and starch in a high-speed mixer, and then kneading the mixture together with polyvinyl alcohol in a kneading machine to obtain starch-based master batch; and finally carrying out melt blending on the starch-based master batch and polylactic acid through one of or a combination of more of an open mill, an internal mixer and an extruder to obtain the high-starch-content waterproof totally-decomposed composite material. Compared with the ordinary biology-based composite material, the high-starch-content waterproof totally-decomposed composite material is high in starch content, low in cost, and good in ingredient compatibility, the mechanical property and waterproof property of the material can be both obviously improved, and all ingredients can be totally decomposed, so that the excellent sustainable development characteristic can be achieved; and meanwhile, the high-starch-content waterproof totally-decomposed composite material can be machined by adopting die pressing, extrusion, injection molding and other technologies on general plastic machining equipment.

Description

technical field [0001] The invention relates to a high-starch content water-resistant fully degradable composite material and a preparation method thereof, in particular to modifying starch with nano-silica and blending it with polylactic acid, polyvinyl alcohol and other degradable materials to prepare high-starch content water-resistant A fully degradable composite material and a preparation method thereof belong to the technical field of polymer materials. Background technique [0002] Based on the pressure of environmental and social sustainable development, governments of various countries have attached great importance to the white pollution of plastics, and thus have given strong support to the research and development of degradable plastics. [0003] Starch (St) is a polysaccharide compound, which is a widely used biodegradable natural polymer. It is decomposed into glucose under the action of microorganisms, and finally degraded into CO 2 and H 2 O. Although star...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08L67/04C08L29/04C08K3/36C08J3/22
Inventor 唐颂超何帅王婷兰潘泳康卜扬帆孟利良黄文娴朱瑾
Owner EAST CHINA UNIV OF SCI & TECH
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