| Acrylate-epoxy resin composite coatings are affirmed the important development direction of waterborne anticorrosion coating,owing to combine the virtues of both polyacrylate and epoxy resin.graphene is widely used in anticorrosion coating as pigments with outstanding performance including two-dimensional planar structure,excellent barrier property for water molecules,oxygen and electrolyte.Graphene has achieved industrialization preparation,however,its dispersity in water-based resin is the issue in the field of industrial of graphene and waterborne anticorrosion.Around these problems,new waterborne acrylate-epoxy resin core-shell emulsion and different types of functionalized graphene derivatives are synthesized by the many kinds of process,and study the relationship between structure and anticorrosion performance.The details of research are as follows:(1)An unsaturated epoxy resin ester(EM)was firstly prepared by addition-esterification reaction with acrylic acid,and then a series of acrylic ester/epoxy hybrid latexes(AE)with core-shell structure were synthesized by semi-continuous emulsion polymerization method.Th e resultant AE emulsions are utilized as anti-corrosion coatings of metals.The influences of EM and A173 content on the physicochemical properties of the resultant emulsions and anti-corrosion coatings of metals are investigated in detail.The AE emulsion displays better anti-corrosion properties when it is prepared under the following conditions:the EM content of 30 wt.%,and A173 content of 3.0 wt.%.AE-30-3 showed best film and corrosion properties,has the highest impedance and voltage(0.3797 V)and the lowest corrosion current density(6.12E-7 A/cm~2).(2)A novel type of water dispersible graphene(PG)has been synthesized by nucleophilic ring-opening reaction of the primary amine group in the PPS with epoxy groups on the basal plane of GO,follow ed by in situ reduction with hydrazine hydrate.The PG is employed as nanoscale reinforcement fillers in acrylate-epoxy resin(AE)coatings.The structure of PG is characterized by FT-IR,XPS and XRD,the AFM and TEM response the thickness of PG nanosheet is 4 nm,the SEM and Turbiscan proves that PG has excellent dispersion stability in AE resin.Potentiodynamicpolarizationandelectrochemicalimpedance spectroscopy studies indicated that the PG/AE composite coatings exhibit higher corrosion resistance in simulated body fluid(SBF)compared with pure AE coating and GO/AE coating.In addition,the stability and corrosion resistance of the composite materials reach optimum when the PG content is 2%.PG/AE-2 coating has the highest Ecorr(-0.115V)and lowest Icorr(1.04E-8A/cm~2),PPS functionalized graphene(PG)displays prospective application in anticorrosion field.(3)Tin antimony oxide-graphene oxide(ATO-GO)sheet hybrids were fabricated using GO as a precursor,then anchoring ATO on GO sheets with the help of 3-aminopropyltriethoxysilane.Scanning transmission electron microscope(SEM),Transmission Electron Microscope(TEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were performed on the resultant composites.By using ATO-GO as fillers,the ATO-GO/AE nanocomposite emulsions were fabricated.The results show that the ATO-GO combine with high surface area and water dispersion of GO and the conductivity of antimony tin oxide.When ATO-GO added 1%,ATO-GO/AE coating shows excellent long-term anti-corrosion performance and antistatic performance,may satisfy the demand of antistatic and anticorrosion coating.(4)Phosphorylated graphene oxide(Ped GO)was preperated by in-situ phosphate esterification method,with Graphene oxide and phos phoric acid as reaction monomers,urea as catalyst,and then by using Ped GO as fillers,the Ped GO/AE nanocomposite emulsions were fabricated.The results of XRD,XPS,TEM and EDX show that the structure of Ped GO consistent with design,and has excellent di spersion performance in the AE emulsion.The electrochemical tests and salt spray test results showed that Ped GO/AE composites present the excellent long-term anti-corrosion performance.The anticorrosion mechanism of Ped GO/AE was dicussed based on shielding effect and phosphate ester passivation effect. |
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