Bio-based nano composite epoxy coating inspired by nacre as well as preparation method and application of bio-based nano composite epoxy coating

Abstract

The invention particularly relates to a bio-based nano-composite epoxy coating inspired by a nacreous layer as well as a preparation method and application of the bio-based nano-composite epoxy coating. Graphene oxide modified by reversible quadruple hydrogen bond 2-ureido-4 [1H]-pyrimidone-isocyanate molecules is used as a hard inorganic phase, and a self-repairing bio-based epoxy polymer system is used as a soft organic phase; the self-repairing bio-based epoxy polymer system comprises bio-based cardanol epoxy resin, an isophorone diamine curing agent and isophorone diamine with 2-ureido-4 [1H]-pyrimidone (UPy) on a branched chain, and a highly homogeneous bionic layered nano-composite coating is formed through solvent evaporation and prepolymer crosslinking film formation induction. The bionic nano-composite coating prepared by the method has good mechanical property, rapid self-repairing capability and good corrosion resistance, the preparation process is simple and controllable, the raw materials are green and environment-friendly, and the bionic nano-composite coating can be widely applied to the technical field of metal surface protection of electronic devices, engineering equipment and the like.

Description

technical field [0001] The invention specifically relates to a bio-based nano-composite epoxy coating inspired by nacre and its preparation method and application, belonging to the technical field of metal surface protective coatings. Background technique [0002] The problem of metal corrosion protection is severe and demanding, and smart organic coatings have the ability to self-heal physical damage such as micro-defects and micro-cracks, which has now been proven to be very effective in extending the life of engineering coatings and improving safety and reliability. At present, it is generally believed that the hotspot strategy for constructing self-healing protective coatings is to introduce host-guest inclusion, metal coordination bonds, ionic bonds or hydrogen bonds and other supramolecular reversible interactions from the design of resin molecules. The non-covalent cross-linking sites of the network, which allows the cross-linking sites to achieve rapid reconstruction...

AI Technical Summary

Problems solved by technology

[0004] At present, the design of self-healing coatings only focuses on improving the efficiency of self-healing performance, such as: Chinese patent CN113158899 and Chinese patent CN 201410489624 have obtained an epoxy resin material based on UPy quadruple hydrogen bond repair, but choose Environmentally harmful and non-renewable epoxy resin is used as the main body of the polymer network, which does not meet the green environmental protection concept of metal corrosion protective coatings; in addition, there are many studies on the coating of imitation nacre, but most of them only focus on bionic coatings Extended barrier properties

Therefore, the biomimetic environmental protection coating system with high performance self-healing coating and shielding barrier performance based on bio-based epoxy resin has great potential for practical application, but it has not been reported yet.

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