Research On Water-borne And Self-stratifying Coating In Epoxy-acrylic Resin

Heavy machinery need a excellent decorative and weather resistance and corrosion resistance coating for protection due to working out door under a complex environment.The ordinary method is multichannel painting,but it will consume much time and labor and also cause painting defects.So it is necessary to develop a coating which will provide good weather resistance and corrosion resistance after just one-time painting.In the article a water-borne and self-stratifying coating was developed for metal surface protection,which can stratify two different layers with good weather fastness or corrosion resistance in curing process.The main results of this dissertation listed as follows:The water-borne epoxy resin was prepared by modifying epoxy resin.Some measurements,such as IR,epoxide number,pH,electrical conductivity testing,were used to character the reaction factor.The water-borne acrylic resin was prepared by acrylic monomer polymerization reaction.The ratio of soft monomer and hard monomer,monomer TG,the effect of water soluble groups than in resin were used in resin formula design,the additives such as initiator was be added for control viscosity.The self-stratifying interface energy model was be used for forecasting self-stratifying,and the self-stratifying was confirmed by finding the difference of physicochemical property between the bottom and surface of the coatings.The electrochemical impedance spectroscopy(EIS)and ultraviolet light aging testing was used to test the fastness and corrosion resistance property of the coating.The research results indicate that: after self-stratified,the weather fastness of the coating offered by the surface coating,and the bottom coating afford corrosion resistance property,and the coating reach the best corrosion resistance property when the ratio of epoxy resin and acrylic resin is1:1.