The semibatch emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) in the presence of 2-hydroxyethyl methacrylate (HEMA) initiated by K2S2O8 (PSP) was studied. The average p...The semibatch emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) in the presence of 2-hydroxyethyl methacrylate (HEMA) initiated by K2S2O8 (PSP) was studied. The average particle diameter increases with an increase of total solids content, HEMA content, PSP content, ionic strength of the system and monomer feed rate, and decreases with the monomer feed ratio from 3/1 (MMA/BA mole.) to 1/3. The stability of this reaction system is improved by adding HEMA as nonionic comonomer. The high solids content (50%) latex with monodisperse particle can be obtained using this process.展开更多
以甲基丙烯酸甲酯（MMA）、甲基丙烯酸（MAA）、乙烯基三甲氧基硅烷（YDH-171）、四甲基四乙烯基环硅氧烷（DV4）、烯丙基羟乙基醚（AOE）为原料,K2S2O8-Na2SO3为氧化还原引发体系,实施自乳化、开环同步进行的自由基无皂乳液聚合,合成...以甲基丙烯酸甲酯（MMA）、甲基丙烯酸（MAA）、乙烯基三甲氧基硅烷（YDH-171）、四甲基四乙烯基环硅氧烷（DV4）、烯丙基羟乙基醚（AOE）为原料,K2S2O8-Na2SO3为氧化还原引发体系,实施自乳化、开环同步进行的自由基无皂乳液聚合,合成了无皂硅丙乳液。通过L9（3）4正交实验优化的单体配比是：当体系p H值为4.5~5、K2S2O8与Na2SO3的质量比为2∶1且用量为单体总质量的0.5%时,MAA、AOE、YDH、DV4、MMA的质量比为8∶9∶4∶20∶59,此时聚合反应的凝胶率0.18%。红外光谱证实,DV4已开环且所有单体均已参与共聚反应;热重分析表明,无皂硅丙乳液的热稳定性好,最大热分解温度为449℃;粒度和透射电镜分析表明,乳胶粒平均粒径为158 nm,粒径分布窄（PDI=0.031,Zeta=-53.9 m V）,具有单分散性;常规性能检测表明,乳液的各项指标均达到国标要求。将硅丙乳液与金红石型钛白粉及各种助剂混合,配成建筑内墙涂料,其涂层的主要性能指标达到或超过国家标准。展开更多
文摘The semibatch emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) and n-butyl acrylate (BA) in the presence of 2-hydroxyethyl methacrylate (HEMA) initiated by K2S2O8 (PSP) was studied. The average particle diameter increases with an increase of total solids content, HEMA content, PSP content, ionic strength of the system and monomer feed rate, and decreases with the monomer feed ratio from 3/1 (MMA/BA mole.) to 1/3. The stability of this reaction system is improved by adding HEMA as nonionic comonomer. The high solids content (50%) latex with monodisperse particle can be obtained using this process.
文摘以甲基丙烯酸甲酯（MMA）、甲基丙烯酸（MAA）、乙烯基三甲氧基硅烷（YDH-171）、四甲基四乙烯基环硅氧烷（DV4）、烯丙基羟乙基醚（AOE）为原料,K2S2O8-Na2SO3为氧化还原引发体系,实施自乳化、开环同步进行的自由基无皂乳液聚合,合成了无皂硅丙乳液。通过L9（3）4正交实验优化的单体配比是：当体系p H值为4.5~5、K2S2O8与Na2SO3的质量比为2∶1且用量为单体总质量的0.5%时,MAA、AOE、YDH、DV4、MMA的质量比为8∶9∶4∶20∶59,此时聚合反应的凝胶率0.18%。红外光谱证实,DV4已开环且所有单体均已参与共聚反应;热重分析表明,无皂硅丙乳液的热稳定性好,最大热分解温度为449℃;粒度和透射电镜分析表明,乳胶粒平均粒径为158 nm,粒径分布窄（PDI=0.031,Zeta=-53.9 m V）,具有单分散性;常规性能检测表明,乳液的各项指标均达到国标要求。将硅丙乳液与金红石型钛白粉及各种助剂混合,配成建筑内墙涂料,其涂层的主要性能指标达到或超过国家标准。
