Starch-base degradable bioplastic and preparing method thereof

Abstract

The invention relates to starch-base degradable bioplastic and a preparing method thereof, and belongs to the technical field of biodegradable materials. The starch-base degradable bioplastic is prepared from 40-85% of commodity polymer plastic, 10-50% of a high-hydrophobicity starchiness material, 0.5-5% of aliphatic polyester and 0.1-5.5% of oxidation accelerator. The preparing method of the starch-base degradable bioplastic includes the following steps that starch is treated in a hydrophobization mode to obtain the high-hydrophobicity starchiness material, the raw material components are mixed by a ratio and prepared into master batch through a twin-screw extrusion machine, and after the master batch and the commodity polymer plastic are mixed, the starch-base degradable bioplastic is prepared through injection molding, flattening, blow molding, vacuumizing and forming. The product prepared through the method can be used repeatedly on the dry condition without perpendicular sunlight incidence, the strength is kept unchanged basically, an abandoned product is completely decomposed finally in wet soil, no harmful component is generated, and the environment is not polluted.

Description

technical field [0001] The invention relates to a starch-based degradable bioplastic and a preparation method thereof, belonging to the technical field of biodegradable materials. Background technique [0002] As a synthetic polymer material, plastic is widely used in home appliances, automobiles, etc. , furniture, packaging supplies, agricultural film and many other aspects, the extensive use of plastics has produced many disposable plastic wastes that cannot be recycled, resulting in increasingly serious "white pollution", such as groundwater pollution and soil pollution, animal and plant resources It is destroyed and seriously threatens the survival and health of human beings. Starch plastics, also known as starch-based plastics, generally refer to plastics whose composition contains starch or its derivatives. Plastics with natural starch as filler and plastics with natural starch or its derivatives as the main component of the blend system belong to this category. [0...

AI Technical Summary

Problems solved by technology

[0003] Traditional general-purpose polymer materials are difficult to be degraded by microorganisms due to their nature, that is, they will not rot and mildew, and then they will remain in the existing life for a long time. Therefore, the problem of plastic garbage bag pollution is becoming more and more serious, causing widespread worldwide At present, there are existing general-purpose polymer materials that cannot be degraded by microorganisms, which are prepared by adding a certain proportion of natural polymer materials that can be degraded by microorganisms, such as starch, cellulose, protein, chitin, etc. The product can be degraded by microorganisms, but this kind of natural polymer materials are highly hydrophilic, while common general-purpose polymer materials are highly hydrophobic, the compatibility between the two is very poor, and the mechanical strength after blending Greatly reduced, in order to enhance compatibility, scientists have used many methods, such as silanizing starch or treating with isocyanate, or grafting a layer of acrylate or vinyl acetate on starch, but these methods are a bit expensive and have a little effect Poor, the hydrophobicity of the modified starch is still insufficient