水性上光油用苯丙共聚乳液的合成及性能表征

以苯乙烯(St)、丙烯酸丁酯(BA)和马来酸酐(MAH)为共聚单体,过硫酸钾(KPS)为引发剂,十二烷基硫酸钠(SDS)/壬基酚聚氧乙烯醚(OP-10)为复合乳化剂,采用半连续加料的乳液聚合法合成出一种水性上光油用苯丙共聚乳液。考察了玻璃化转变温度(Tg)、引发剂和乳化剂含量等对该乳液单体转化率、平均粒径、黏度和表干时间等影响,并对该乳液的热稳定性能进行了研究。结果表明:当w(引发剂)=0.6%、w(复合乳化剂)=1.2%和m(MAH)∶m(BA)∶m(St)=4.6∶36.3∶50.5时,该乳液具有良好的综合性能,完全满足水性上光油的使用要求,并且可在高温环境中使用。

Synthesis and properties characterization of styrene-acrylate copolymer emulsion for waterborne varnish

With styrene(St),butyl acrylate(BA) and maleic anhydride(MAH) as comonomers,potassium persulfate(KPS) as initiator,and sodium dodecyl sulfate(SDS)/nonylphenol ethoxylates(OP-10) as composite emulsifier,a styrene-acrylate copolymer emulsion for waterborne varnish was prepared by semi-continuous charging emulsion polymerization.The influences of some factors such as glass transition temperature(Tg),initiator contents and emulsifier contents were investigated on monomer conversion,average particle size,viscosity and surface drying time for the emulsion.At the same time,the thermal stability of emulsion was also studied.The results showed that the emulsion can fully meet application requirements for waterborne varnish,and can be used in environment of high temperature because the emulsion had good combination property when mass fractions of initiator and composite emulsifier were 0.6% and 1.2% respectively,and mass ratio of m(MAH)∶m(BA)∶m(St) was 4.6∶36.3∶50.5.