	US 12,031,051 B2
	Method of preparing recyclable and self-repairable epoxy anticorrosion coating
Weihua Li, Guangzhou (CN); and Ting Shen, Guangzhou (CN)
Filed by Sun Yat-sen University, Guangzhou (CN)
Filed on Apr. 11, 2022, as Appl. No. 17/717,240.
Claims priority of application No. 202110868027.2 (CN), filed on Jul. 30, 2021.
Prior Publication US 2022/0235241 A1, Jul. 28, 2022
Int. Cl. C09D 163/00 (2006.01); C08K 3/04 (2006.01)

CPC C09D 163/00 (2013.01) [C08K 3/04 (2013.01)]

8 Claims

1. A method of preparing a modification-free, recyclable and photothermally-driven self-repairing epoxy anticorrosion coating, comprising:

(S1) mixing a bisphenol A epoxy resin monomer with an anhydride curing agent uniformly under stirring to obtain a reaction solution;

(S2) dispersing a photothermal filler uniformly in the reaction solution obtained in step (S1) to obtain a casting solution; wherein the photothermal filler is selected from the group consisting of carbon particle, amorphous carbon, graphite, carbon nanotube, graphene, graphene-derived material, allotrope thereof and a combination thereof; and

(S3) coating the casting solution onto a substrate followed by curing in a temperature range of 110-130° C. for 4-12 h and cooling to obtain the modification-free, recyclable and photothermally-driven self-repairing epoxy anticorrosion coating, wherein within the temperature range of 110-130° C., a curing time is accordingly shortened by 2 h with respect to every 5° C. increase in temperature; under such curing condition, only a chain growth reaction between the bisphenol A epoxy resin monomer and the anhydride curing agent occurs in an epoxy-anhydride system, and chains are entangled with each other instead of cross-linking.