梯度苯丙乳液的合成  

Synthesis of Styrene-Acrylate Latex with Gradient Structure

作　　者：苏慧[1] 谢德龙[1] 张心亚[1] 陈焕钦[1] 

机构地区：[1]华南理工大学,广州510640

出　　处：《涂料工业》2011年第9期45-49,共5页Paint & Coatings Industry

基　　金：国家自然科学基金(50803017)

摘　　要：以苯乙烯(St)和丙烯酸丁酯(BA)为主要核单体,甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)为主要壳单体,甲基丙烯酸(MAA)和甲基丙烯酸羟丙酯(HPMA)为功能性单体,采用梯度乳液聚合法制备了硬核软壳型苯丙乳液。考察了聚合工艺,乳化剂的配比及含量,引发剂浓度,反应温度以及功能性单体含量对乳液聚合过程及性能的影响。结果表明:乳化剂占单体总量的1%,DSB/OP-10的质量比为2∶1,引发剂占单体总量的0.5%,反应温度为80℃,功能性单体含量为4%时,聚合稳定,凝胶量少,乳液性能优异,且采用梯度乳液聚合方式可有效降低乳液的最低成膜温度。通过红外光谱测定了苯丙共聚物的结构组成,透射电镜(TEM)对粒子结构进行分析,验证了其梯度结构形态。Styrene - acrylate latex with hard core - soft shell structure was prepared by gradient emulsion polymerization technology, using styrene （St）, butyl acrylate （BA） as core monomers, and methyl methacrylate （MMA）, butyl acrylate （BA） as shell monomers, methacrylic acid （MAA）, hydroxypropyl methacrylate （HPMA） as functional monomers. The effects of emulsion polymerization technology, emulsifiers, initiator, reaction temperature and functional monomers on the properties of latex were studied. The results showed that the most stable polymerization process and optimum comprehensive properties of latex with less gel formation could be reached when the mass ratio of DSB/OP - 10 was 2： 1, the mass of emulsifier, initiator, functional monomer were 1%, 0.5%, 4% of monomers respectively, the reaction temperature was 80 ℃ and that typical core -shell structure emulsion with lower MFT could be prepared by gradual seed emulsion polymerization. Styrene -acrylate copolymers＇ chemical structure were characterized by IR, and the particle morphology was observed by TEM, which further verified core - shell structure of the particles.

关 键 词：梯度乳液聚合 乳化剂 引发剂 温度 功能单体 

分 类 号：TQ630.43[化学工程—精细化工]