Preparation and performance study of secondary dispersion of chloroether-acrylic resin
The secondary dispersion of chloroether-acrylic resin was synthesized by solution polymerization method using chloroether resin as a modified resin.Then,the two-component water-based coating was prepared in a ratio of m(chlorinated ether-acrylic resin secondary dispersion):m(amino resin curing agent)=5:1.The effects of solvent content,reaction temperature,neutralizer type and neutralization degree,and hydroxyl content on the secondary dispersion were explored.The molecular structure of the modified resin and the particle size of the dispersion were tested and characterized.The properties of chloroether-acrylic resin aqueous dispersion and its two-component baking coating were studied.The research results showed that,the optimized preparation conditions for chloroether resin modified acrylic resin solution were the reaction temperature of 90-100℃,the reaction time of 5 hours,solvents of propylene glycol butyl ether and 2-butoxyethanol(with the content of about 11%of the total mass of the aqueous dispersion),initiator of BPO,and HPA as crosslinking functional monomer.Under the optimal synthesis conditions,the chloroether resin modified acrylic ester aqueous dispersion was prepared.The modified aqueous dispersion had a milky white appearance with blue light,the solid content of about 48%,the viscosity of 3015 mPa·s,the average particle size of about 185 nm,and stable storage at(50±2)℃/7 days.Compared with commercially available hydroxy acrylic acid aqueous dispersion,the coating film properties of the chloroether-acrylic resin dispersion prepared in this article were more superior.
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