Study On Preparation Of Styrene Acrylicemulsion Modified By Epoxy Resin And Its Application In Coatings

The experiment used the graft copolymerization principle and the stable styrene-acrylic emulsion modified by epoxy resin was prepared by use of pre-emulsified addition. The influence of temperature, epoxy resin, initiator, emulgator, the ratio of soft monomer and hard monomer, functional monomer on modified emulsion and film was investigated.The results showed that the best temperature was80℃, the content of E-44was5%, the ratio of soft and hard monomer was1:1, the content of emulgator was3%and the ratio of emulgator was1:1, the content of initiator was0.6%, the content of functional monomer was2%. The modified emulsion had good stability and chemical stability, the modified emulsion film hardness, adhesion and waterproof were improved than unmodified. The pencil hardness of H, adhesion of1level,24h not blanching in water and the water absorption was3.6%. We used scanning electron microscope, fourier transform infrared spectrometer, laser particle size distribution analyzer, differential thermal analyzer and differential scanning calorimeter to characterize and analyse the properties of emulsion and film.A water-based rust coating was prepared by transforming agent tannic acid and citric acid, styrene-acrylic emulsion modified by epoxy resin, additives and the rusty coating can be directly applied to the corroded metal surface without rusting. The influence of the amount of modified emulsion, transforming agent on the coating properties were investigated. The results showed when the the content of modified emulsion was65%, the ratio of tannic acid and citric acid is1:1and the contents of transforming agent was3%, The film of rust coatings had a neat appearance, had a high rust conversion rate and had a outstanding performance on salt spray test.The water-based wood paint was prepared with modified emulsion and pure acrylic emulsion. The results showed:the ratio of modified emulsion and pure acrylic emulsion was4:1, the best content of film-forming additive was3%, the content of leveling agent was0.15%, the content of defoamer was0.6%and the content of bodying agent was0.3-0.4%. The paint had excellent waterproof ability, chemical resistance, adhesion of1and blocking resistance is A-0. The film appearance even and neat. It had good combination properties.