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

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...

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.

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