通过半连续乳液聚合法,以甲基丙烯酸十二氟庚酯、丙烯酸丁酯、甲基丙烯酸和甲基丙烯酸甲酯为单体,在聚氧乙烯辛基苯酚醚-10(OP-10)和十二烷基硫酸钠(SDS)复合乳化剂的作用下,以过硫酸氢氨(APS)为引发剂合成了水性含氟丙烯酸乳液,综合乳液性状、粒径及分布、红外光谱结果确定水性含氟丙烯酸乳液的最佳制备工艺。将水性含氟丙烯酸乳液配以功能性助剂,制备高耐候、环保的水性氟碳涂料,考察了其对混凝土耐酸碱性、吸水率、抗氯离子渗透性和耐候性的影响。结果表明:当复合乳化剂质量分数为2.1%(wt,质量分数,下同)、引发剂用量为0.4%、含氟单体用量为8.4%时,制备的水性含氟乳液离心稳定性好,固含量为48.2%,转化率为97.6%,平均粒径为136.2nm,涂装水性氟碳涂料的混凝土试块的综合防腐效果较好。

The fluoroacrylate emulsion was prepared by stepwise emulsion polymerization,in which dodecafluoroheptyl methacrylate (DEMA),butyl acrylate (BA),methacrylic acid (MAA) and methyl methacrylate (MMA) as monomers,ammonium persulfate (APS) as initiator.The optimal preparation process was determined by the emulsion appearances,particle size distribution and infrared spectrum.The results shown that when the amount of emulsifier was 2.1wt%,the amount of initiator 0.4wt% and the amount of monomer DEMA 8.4wt%,the prepared waterborne fluoroacrylate emulsion had concentrated particle size.The average particle size was 136.2nm nearly light blue color.The solid content was 48.2%.The monomer conversion rate was 97.6%.The waterborne fluoroacrylate coating was prepared with fluoroacrylate emulsion and functional additives to provide a long-term protection for concrete by reducing water absorption,improved corrosion resistance and weatherability.