US 11,891,490 B2
Protective starch-based film and its preparation method and application
Long Chen, Wuxi (CN); Hao Xu, Wuxi (CN); Zhengyu Jin, Wuxi (CN); Ming Miao, Wuxi (CN); Yaoqi Tian, Wuxi (CN); Xinwen Peng, Wuxi (CN); Yidong Zou, Wuxi (CN); and Guanxiong Chen, Wuxi (CN)
Assigned to JIANGNAN UNIVERSITY, Wuxi (CN)
Filed by Jiangnan University, Wuxi (CN)
Filed on Aug. 14, 2023, as Appl. No. 18/233,375.
Application 18/233,375 is a continuation of application No. PCT/CN2023/079274, filed on Mar. 2, 2023.
Claims priority of application No. 202210750655.5 (CN), filed on Jun. 28, 2022.
Prior Publication US 2023/0383075 A1, Nov. 30, 2023
Int. Cl. C08J 5/18 (2006.01); C08L 3/02 (2006.01); C08K 3/22 (2006.01); C08K 9/04 (2006.01)
CPC C08J 5/18 (2013.01) [C08K 3/22 (2013.01); C08K 9/04 (2013.01); C08L 3/02 (2013.01); C08J 2303/02 (2013.01); C08K 2003/2296 (2013.01); C08K 2201/011 (2013.01); C08K 2201/018 (2013.01)] 8 Claims
 
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.