Normal Temperature Curing Waterborne Steel Structure Heavy Anticorrosive Coating

Due to the increasingly stringent environmental regulations,the application of heavy-duty coatings for solvent-based steel structures is subject to many restrictions.Water-based steel heavy anti-corrosion coating came into being.However,there is a great deal of incompatibility between the water in the steel structure anti-corrosion and anti-corrosion coatings.In particular,the water in the water-based anti-corrosion coating aggravates the flash rust of the steel substrate.The commonly used anti-flash rust treatment method is to add anti-flash rust agent to the paint.In this paper,the use of tourmaline features,the use of tourmaline powder as anti-rust pigments for water-based steel structure heavy anti-corrosion coating,and achieved some beneficial results.In this paper,by studying the organic modification of tourmaline powder surface,can make the surface of powder particles.There are double bonds that can participate in the polymerization reaction and thus improve its compatibility with the polymer matrix and dispersion stability.According to the research status and development of water-based anti-corrosion coatings,this study aims to prepare tourmaline-modified styrene-acrylic emulsions for the preparation of environment-friendly water-based anti-corrosion coatings.The specific research contents are as follows:(1)Through the discussion of organic modification reaction of tourmaline powder surface with silane coupling agent,the optimized process conditions were obtained.The oil absorption of the modified tourmaline is 31%,the activation index is 85%,and the absorbency is 0.42.The silane coupling agent forms a siloxane structurewhich reduces the surface polarity of the tourmaline particles.After modification,the negative ions released has not significantly reduced,and the dispersibility of the modified tourmaline has significantly improved.(2)Using in-situ emulsion polymerization method with n-butyl acrylate as monomers,modified tourmaline was selected as the rust-proof pigment copolymer to prepare a modified styrene-acrylic emulsion.The experimental results show that anionic/non-ionic emulsifiers are used in an emulsifier system at a polymerization temperature of 80° C.and a rotation speed of 250 r/min,the amount of initiator that based on the total mass of the monomers is 0.6%.The emulsion prepared by adding the modified tourmaline powder with the mass fraction of 3% in a pre-emulsified manner exhibits white blue light and has good storage stability.The properties of the coating film were tested by EIS.The results showed that the content of modified tourmaline was styrene-acrylic emulsion coating.The radius of arc resistance is greater than that of blank group;and with the increase of the content of modified tourmaline,the radius of capacitive reactance arc increases first and then decreases.When the mass fraction of the modified tourmaline is 3%,the radius of the capacitive arc is the largest,and the corrosion resistance of the coating is the best.(3)Discuss the influence of base materials in anti-corrosion coatings on coating performance.The results show that the coating prepared by using two acrylate emulsions as the base material The EIS showed that the waterborne paint coating prepared by blending a styrene-acrylic emulsion modified with a urethane acrylate emulsion had better corrosion resistance.Applied to tinplate and Q234 steel sheets,there is no big difference in the apparent performance of the coating.The coating on the tinplate sheet shows better anti-corrosion properties.