Completely biodegradable resin made of non-staple grain plant modified starch and preparation method thereof

Abstract

The invention discloses completely biodegradable resin made of non-staple grain plant modified starch and its preparation method. The method comprises the steps of: first putting non-staple grain plant starch into a reaction vessel, adding water to prepare it into starch milk, and heating it to a proper temperature, conducting stirring and washing, then adding chemicals into a water solution for modification grafting treatment, and then separating water and starch through centrifugation, and conveying the separated modified starch to an airflow drying system for dewatering and drying, then taking 100 parts of dried modified starch, adding 5-50 parts of a compatilizer, 2-15 parts of an anti-block agent, 0-100 parts of polylactic acid, and 150-250 parts of a completely biodegradable copolymer of dibasic acid and dibasic alcohol, and mixing them uniformly, carrying out extrusion granulating or tabletting under an appropriate temperature and pressure, thus obtaining a resin material or sheet special for complete biodegradation. The resin of the invention has both the usage function similar to ordinary plastic products and a complete biodegradability. And after being used and abandoned, the resin can be degraded into carbon dioxide and water that can be consumed by the environment.

Description

technical field [0001] The invention relates to a preparation method of a fully biodegradable resin made of non-staple grain plant modified starch. Background technique [0002] Using renewable resources to prepare biodegradable materials is an important way. Natural polymer materials such as starch, cellulose, chitin, pullulan polysaccharide, and soybean protein are used as raw materials, and biodegradable plastics can be obtained through various modification and processing methods. product. From the comprehensive consideration of material cost, processability, mechanical properties, etc., starch-natural decomposable polymer materials and artificially synthesized biodegradable polymers and their composite systems are the key research and development objects. Since the beginning of the last century in our country, many enterprises have been researching and engaging in the development of this product. The more representative technologies include: Tianjin Danhai Co., Ltd., th...

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Problems solved by technology

Corn is a staple food crop. The use of corn starch has the problem of competing with others for food. The coupling method has low coupling branching degree, poor compatibility between starch and carrier resin, rough surface of the product, and difficulty in making fine film products, and Problems such as easy oozing of starch; gelatinization method requires a large amount of solvents such as glycerin, etc., which occupy the space of the material, resulting in low starch content, insufficient mechanical properties, and poor physical and dimensional stability due to moisture. University, Sichuan University, Wuhan Huali Technology Co., Ltd. have also carried out corresponding research and development in thermoplastic starch, but the above problems still plague the practical application