Preparation method for degradable plastic film by using discarded shrimp shells

Abstract

The invention provides a method for preparing a degradable plastic film by using discarded shrimp shells, comprising: (1) washing the shrimp shells, drying them, and grinding them into powder; (2) treating the shrimp shell powder by decalcification reaction to obtain shrimp shells Inorganic salt solution of cyanin and filter residue A. The inorganic salt solution can be extracted to obtain astaxanthin, and the filter residue A can be dissolved in absolute ethanol and dehydrated to obtain red pigment and filter residue B; (3) The filter residue B obtained in step (2) is hydrolyzed by a weak base to form a carapace Factors and by-product amino acids. Under the action of deacetylation of concentrated lye, chitin turns into chitosan, and the chitosan-based degradable plastic film is prepared by "cast film forming method". The invention not only realizes the preparation of degradable plastics, but also processes the by-products in the experiment process to obtain three important biochemical raw materials of antioxidant astaxanthin, fourth nutrient protein and food pigment red pigment. The recycling of shrimp shell waste can not only reduce the waste of resources, but also bring huge economic benefits.

Description

technical field [0001] The invention relates to a method for preparing degradable plastics, in particular to a method for preparing chitosan-based degradable plastic films by using discarded shrimp shells. Background technique [0002] Since its birth, plastic has become an indispensable part of human life with its stable chemical properties and superior physical properties, but it is this chemical inertness that makes it difficult to degrade naturally. When plastic enters rivers, lakes, and soil, not only It will cause water and soil pollution and seriously affect human health. At the same time, as an important product of the petrochemical industry, plastics are facing the threat of depletion of raw materials - according to the BP2016 Statistical Yearbook, global petroleum can only be used for 55 years. In order to effectively solve this problem, it is extremely important to find a production method of degradable plastics that can be used on a large scale and is pollution-...

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Problems solved by technology

China's annual output of shrimp shell waste ranks first in Asia, up to 1.4 million tons, of which only a small part

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