苯丙乳液的制备及其性能影响因素研究

摘要

A kind of styrene-acrylate emulsion with excellent performance was synthesized by styrene,butyl ac-rylate (as the main monomers)and acrylic acid (as the functional monomer)via mixed emulsifiers of SDS/OP-10 and ammonium persulfate served as the initiator.The pre-emulsification technology and semi-continuous seed emulsion polymerization process were introduced.The polymer emulsion was characterized by Fourier transform infrared (FT-IR)spectroscopy,differential scanning calorimetry (DSC),gel permeation chromatog-raphy (GPC)and nano-ZS90 etc.The effects of monomer ratio,composite emulsifier,polymerization tempera-ture and the dosage of initiator on the emulsion film-forming properties,water resistance,stability and other conventional performance were systematically studied.The results showed that,the latex particle size was greatly influenced by composite emulsifier types and amount,but also related to the dosage of initiator.Mono-mer ratio was a key factor of the glass transition temperature.%以苯乙烯、丙烯酸丁酯为主单体,丙烯酸(AA)为功能单体,SDS/OP-10为复合乳化剂,过硫酸铵为引发剂,采用单体预乳化、半连续种子乳液聚合工艺,制备出性能优异的苯丙乳液。采用 FT-IR、DSC、GPC、Nano-ZS90等对聚合物乳液进行了表征,系统研究了单体配比、复合乳化剂、引发剂用量、聚合温度等因素对乳液成膜性、耐水性、稳定性等常规性能的影响。结果表明,乳胶粒粒径受复合乳化剂种类及用量的影响较大,同时也与引发剂用量有关；单体配比是乳液玻璃化温度(Tg )的关键影响因素。