Exploratory Investigation Of Chemical Bonding On Marine Coating Interface

As we all known, ships are in the very harsh marine environment, whose surfacemust be painted multi-layer coating with different protective properties. But becauseof the different structures of the film-forming resin and which is relying on thephysical attachment combination among the different coating as well as the coatinginterface adhesion is not strong, often lead to anti-fouling paint fall off and failure.Therefore, how to achieve a fast and efficient chemical bonding reaction of protectiveperformance on the different coating interface has been a research problem. Thesymbol of Click chemistry developed in the last decade is fast, efficient and highpercent conversion rate of organic reactions, especially the CuAAC, because ofwhose mild reaction conditions, quantitative conversion, good product stereoselective,and can withstand many organic functional groups, as well as its convenient rawmaterials and segregative product make it can meet the requirements of coatinginterface chemical link.This paper was started by modifing the epoxy resin, prepared the azide functionalepoxy resin coating of high surface energy, and explored small molecule clickreaction conditions. It is confirmed that the chemical bonding reaction reacts on thesurface of epoxy resin coating by means of surface infrared and elemental analysis.At the same time the epoxy curing agent was under functional modification withalkynyl. The click reaction condition was applied to the coating interface, and theadhesion test was used to inspect the adhesion strength of interface. The mainresearch work is summarized as follows:（1）Modifying epoxy resin with azide successful, exploring and summarizing thebest modified conditions.（2）Confirmed by the ATR characterization: Azide functional epoxy resin groupswere enrichment on the cured varnish surface.（3）Mixing azide functional epoxy resin and epoxy resin by different ratio, andinvestigating their functional groups of surface enrichment, surface energy, water absorption rate and coating performance, Research Finds that the coatings made upwith composition containing azide functionalized epoxy, as well as high surfaceenergy, which is good for repeating daub.（4）Azide enrichment on surface of functional epoxy resin after curing, studiedand confirmed by FT-IR、EDAX and XPS characterization that the click reaction canoccur on the varnish surface.（5）Exploring the chemical reaction on the coating interface used the conditionsof the above click reaction, and through adhesion test indirectly inspecting the coatinginterface adhesion strength and its reaction. The experimental results show that theadhesive power between the azide functional epoxy resin E-20-N₃-5varnishcoating and the coating mixed with modified epoxy firming agent NX-ynecured epoxy resin is obviously advanced，reaching for10¹1MPa.