Patent ID: 11891490
Assignee: JIANGNAN UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing a protective starch-based film, comprising the following steps:
(1) preparation of metallic polyphenol network coated zinc oxide nanoparticles:
dispersing zinc oxide nanoparticles uniformly in water, adding a tannic acid solution and a hydrated ferric chloride solution separately, shaking for mixing, and adjusting the pH; shaking again for mixing to form a mixture of metallic polyphenol network coated zinc oxide nanoparticles; and washing and freeze-drying the mixture to obtain the metallic polyphenol network coated zinc oxide nanoparticles;
(2) dispersing the metallic polyphenol network coated zinc oxide nanoparticles obtained in step (1) in water, and carrying out ultrasonic treatment to form a dispersion;
(3) dissolving starch in an aqueous solution, heating to gelatinize, and then stirring and cooling to form a starch gelatinization solution;
(4) mixing a melanin-like precursor with the dispersion obtained in step (2) and the starch gelatinization solution obtained in step (3), stirring evenly, and adjusting the pH; and then, stirring under the condition of blowing oxygen or air for self-polymerization so as to obtain a polymer solution, wherein
the melanin-like precursor is one or more of 5S cysteine dopamine, 5, 6-dihydroxyindole, catecholamine, and dopamine; and
(5) pouring the polymer solution obtained in step (4) into a polytetrafluoroethylene plate by using a tape casting method, drying the plate in an oven to form a film, and then peeling off the film and perform humidity balancing on same to obtain the protective starch-based film.