Histamine-modified Epoxy Resin and its Effect on Properties of Organic Coatings
To solve the problem of poor adhesion of the coating/metal interface in deep-sea environ-ments,active epoxy resin(ZA-EP)was prepared by grafting histamine onto the epoxy resin E44 molecu-lar chain,which can facilitate the formation of chemical bonds with metal substrate.Histamine heteroat-oms in ZA-EP can form a shared lone pair electron with the vacant orbital of iron/iron oxide,which can promote the formation of the complex of Fe2+ions with the resin,thus improving the interfacial bonding strength between the coating and the metal substrate.Compared with the ordinary epoxy coating,the ad-hesion of the coating containing active resin was significantly improved:for example,the adhesion of ep-oxy coating increased from 6.02 MPa to 15.36 MPa after the addition of 3％ZA-EP.In addition,the test results in the simulated deep-sea water under alternating pressure show that the saturation water absorp-tion of the 3％ZA-EP/EP coating is the lowest,only 1.6％after one cycle test in 3.5％NaCl solution(by high static pressure 3.5 MPa for 12 h+constant pressure 0.1 MPa for 12 h).The EIS results after 3 cycle test(72 h)showed that the impedance of the 3％ZA-EP/EP coating remained stable.In other words,hista-mine modification may facilitate the formation of a chemical bond at the coating/metal interface,enhanc-es the adhesion of the coating,thereby,the ZA-EP/EP coating has a good protective performance.
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