Continuously-produced full-degradable starch-based plastic alloy and preparation method thereof

Abstract

The invention discloses a continuously-produced full-degradable starch-based plastic alloy and a preparation method thereof. The starch-based plastic alloy contains the following components in parts by weight: 40-90 parts of starch, 5-60 parts of poly(butylene succinate), 5-60 parts of polylactic acid, 10-40 parts of plasticizer, 0.1-10 parts of compatibilizer and 1-10 parts of processing acid. The preparation method comprises the steps of mixing starch, plasticizer and part of processing aid, and extruding to obtain thermoplastic starch particles; then, mixing the thermoplastic starch particles with poly(butylene succinate), polylactic acid, compatibilizer and the residual processing aid, and extruding to obtain the starch-based plastic alloy. The starch-based plastic alloy disclosed by the invention is favorable in hydrophobicity and strength, good in component compatibility, favorable in thermoplastic processability, capable of realizing continuous production and processing as well as simple and feasible in technical process.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a fully degradable starch-based plastic alloy capable of continuous production and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the rapid development of the economy, the concept of sustainable development has become increasingly popular. The problem of environmental pollution has attracted more and more attention from all over the world. At present, petroleum-based plastic products widely used in daily life are usually not degradable under natural conditions, and are prone to produce toxic substances after burning, making plastic waste a serious environmental problem. [0003] The development of biodegradable composite materials is considered to be one of the effective ways to solve "white pollution". This is because they can be finally decomposed into carbon dioxide and water by microorganisms under ...

AI Technical Summary

Problems solved by technology

However, since the main component of filled starch plastics is still non-degradable polyolefin materials, it cannot really solve environmental problems; graft blended starch plastics have complex preparation procedures, easy to form secondary pollution, and difficult to scale production. Disadvantages also limit its development, therefore, the most promising development is thermoplastic starch plastics

However, full starch plastics have poor toughness and low wet strength, and their use alone cannot meet the basic requirements of general plastic products. Therefore, blending starch with degradable polymers or inorganic substances to prepare biodegradable composite materials is the main research at present. direction

[0005] CN101392073B uses a starch hydrolytic enzyme to biochemically modify starch, and then blends with degradable aliphatic polyester or aliphatic-aromatic copolyester to prepare a fully biodegradable starch resin film, which has excellent mechanical properties and good hydrophobicity , but the enzyme treatment process in the patent is cumbersome, which increases the cost; CN1326928C discloses a starch biodegradable plastic masterbatch and its preparation method, which solves the defects of large investment, many processes, long production cycle and high cost in the prior art, but The component contains polyolefin copolymer adhesive, and the product cannot be completely degraded; CN101792591A uses polyethylene carbonate polyurethane as the matrix phase and starch as the filling phase to obtain a fully biodegradable film, which has good toughness and high Tear strength, wide temperature range; CN102321249A discloses a preparation method of a composite material with thermoplastic starch and biodegradable polyester prepolymer as the main components. The starch forms a graft copolymer, thereby greatly improving the compatibility between the carrier and the starch, and the processing conditions are mild, but the activator in the reaction process cannot be completely removed, which may cause secondary pollution; CN102477170A discloses the use of plant fiber, starch, Aliphatic polyester is the main composite material, but the starch content is less than 25% and it is prepared by melt mixing and blending, so it cannot be continuously produced and processed

Images