天然松香改性苯丙乳液的制备及其性能研究

以苯乙烯(St)、甲基丙烯酸甲酯(MMA)、丙烯酸-2-乙基己酯(2-EHA)、丙烯酸-2-羟基乙酯(HEA)和丙烯酸(AA)为反应单体,利用天然松香乳液作为改性剂,通过乳液聚合的方式制备了松香-苯丙复合乳液。研究了乳化剂用量、引发剂用量、松香乳液用量和单体配比对乳液性能的影响。并通过TGA、DLS、TEM对所制备的复合乳液进行了表征。结果表明:当乳化剂用量为单体质量的5%、引发剂用量为单体质量的0.8%、松香乳液用量为单体质量的30%、m(硬单体)∶m(软单体)=2.5∶1时,制得的乳液呈白色泛蓝光,粒径为131 nm。成膜后,漆膜光滑透明,硬度(1H)、耐水性(接触角97.05°)和附着力(1级)等性能良好。

Study on Preparation and Properties of Styrene Acrylic Emulsion Modified with Natural Rosin

Rosin-styrene acrylic composite emulsion was prepared by emulsion polymerization using styrene(St), methyl methacrylate(MMA), 2- ethylhexyl acrylate(2-EHA), 2-hydroxyethyl acrylate and acrylic acid as monomer. Using rosin emulsion as modifier made rosin styrene acrylic composite emulsion by emulsion polymerization. The effects of the amount of emulsifier, initiator, rosin emulsion and the ratio of monomer on the properties of emulsion were discussed. Then the composite emulsion was characterized by thermogravimetric analysis (TGA), dynamic light scattering particle size analysis (DLS), transmission electron microscopy (TEM). The results showed that the resulting emulsion with its particle size of 127 nm presented white with blue phase when the amount of the emulsifier, initiator ,rosin emulsion , hard and soft monomer ratio were 5wt%, 0.8wt% , 30wt% and 2.5:1,respectively. And more, the resulting film was absolutely smooth and transparent with good hardness, water resistance and adhesion properties.