功能型丙烯酸乳液的合成及其性能

以一种阴离子表面活性剂与辛烷基酚聚氧乙烯醚为复合乳化剂，在基体配方中加入多种功能单体，采用半连续滴加方法制备了室温自交联型丙烯酸乳液，讨论了功能单体丙烯酸含量、单体滴加时间对丙烯酸乳液的流变性能、乳胶膜的交联度及耐水性的影响。结果表明：随着丙烯酸含量增加，其乳液粘度上升，乳胶膜交联度增加、吸水率先下降后上升；增加单体滴加时间，可使乳胶粒平均粒径变小，分布变窄，相应生成的乳液粘度变小，同时其乳胶膜交联度上升，吸水率下降。

Study on the Preparation of Functional Acrylic Emulsion and its Properties

Room temperature self-crosslinking acrylic emulsions were prepared by adding several functional monomers and using LX and TX-10 as the composite emulsifiers by semi-continuous emulsion polymerization. The effects of acrylic acid (AA) content and the dropping time of monomers on the viscosity of emulsion, the cross-linking level and the percentage of water-uptake of emulsion film were addressed. It was shown that the viscosity of acrylic emulsion and the cross-linking level of the emulsion film increases with the increase of AA content while the percentage of water-uptake of the film descends first and then ascends with the increase of AA content. Meanwhile, it was found that the average diameter of the emulsion particles becomes smaller and the size distribution becomes narrower with the increase of dropping time of monomers; Accordingly, the viscosity of the acrylic emulsion descends, the cross-linking level of the emulsion film increases and the percentage of water-uptake of the film decreases.