超低VOC内墙涂料用核壳结构苯丙乳液的制备研究  

Study on preparation of styrene-acrylate latex with core-shell structure used in ultra-low VOC building internal wall coating

作　　者：陈立军[1] 陈丽琼[1] 张欣宇[1] 杨建[1] 李荣先[1] 

机构地区：[1]深圳清华大学研究院,广东深圳518057

出　　处：《新型建筑材料》2007年第3期57-62,共6页New Building Materials

摘　　要：采用粒子设计、聚合物形态的概念,以St为核单体、BA为壳单体,十二烷基苯磺酸钠(DSB)和烷基酚聚氧乙烯醚(OP-10)的混合乳化剂为乳化体系,K2S2O(8KPS)为引发剂,引入甲基丙烯酸(MAA)功能性单体,采用壳单体预乳化的核壳乳液聚合工艺。制备出的核壳苯丙乳液具有高Tg、低最低成膜温度和良好的稳定性。当St的用量为55.0%～57.5%、BA的用量为42.5%～45.0%时,混合乳化剂的用量占单体量的2.5%～3.0%,且m(OP-10)∶m(DSB)=2∶1,引发剂用量占单体量的0.55%～0.60%,pH缓冲剂的用量占单体量的0.55%～0.60%,当预乳化温度为45℃、反应温度为80℃,可以制备出具有核壳结构的苯丙乳液。该乳液在配制内墙涂料时可以不加成膜助剂、增塑剂和抗冻融剂,可以有效降低建筑内墙涂料的VOC。The concept of particle design and polymer morphology was adopted. Styrene and butyl acrylate were used as raw material, and mixed emulsifier of DSB and OP-10 was used as emulsification system, and potassium persulfate was used as initiator and functional monomer-methacrylic acid was introduced to prepare styrene-acrylate latex with pre-emulsified shell monomer and core-shell emulsion polymerization method. The latex with high Tg, low MFT and good stability were prepared by using styrene and butyl acrylate as core monomer and shell monomer respectively. The optimum process conditions of preparation core-shell styreneacrylate are obtained as follows： When amount of St is in the range from 55.0% to 57.5% and amount of BA is in the range from 42.5% to 45.0%, the amount of mixed emulsifier is 2.5%-3.0% of monomer mass, and m（OP-10）：m（DSB）=2：1, the amount of initiator is 0..55%-0.60% of monomer mass, and amount of pH buffering agent is 0.55%-0.60% of monomer mass：Pre-emulsified temperature is 45 ℃, reaction temperature of core-shell emulsion polymerization is 80 ℃. When styrene-acrylate with core-shell structure is used to prepare internal wall coating, no film forming assistants, plasticizer or freeze-thaw stabilizer are needed, thus effectively reducing the amount of VOC in the building internal wall coating.

关 键 词：超低VOC 建筑内墙涂料 苯丙乳液 核壳乳液聚合 

分 类 号：TU561.61[建筑科学—建筑技术科学] TQ630.7[化学工程—精细化工]