阳离子型无皂聚丙烯酸酯水溶胶的研制

Preparation of Cationic Soap-free Water-soluble Polyacrylate Colloidal Dispersion

以异丙醇(IP)为溶剂,偶氮二异丁腈(AIBN)为引发剂,甲基丙烯酸二甲胺基乙酯(DM)为功能单体,采用不同的加料方式,对丙烯酸酯类软硬单体进行溶液聚合。溶液聚合产物经酸化后脱去溶剂,以适量的水调节成尺寸在10～100nm、透明或半透明的阳离子型水溶胶。考察并讨论了功能单体DM的含量、加料方式及中和剂的种类、用量、酸化温度对水溶胶的粒径、粘度、稳定性和胶膜耐水性的影响。表观粘度测定结果表明,阳离子型水溶胶具有类似牛顿流体的特性。

A cationic soap-free water-soluble polyacrylate colloidal dispersion was prepared through acidifying the copolymer solution which was produced by solution polymerization of acrylic monomers under different feeding manners and using iso-propanol as solvent, AIBN as initiator, dimethylaminoethyl methacrylate (DM) as functional comonomers. After that, the solvent was removed and some water was put in for adjusting the particle diameter within 10～100nm. The effect of the DM amount, methods of polymerization, manners of feeding, the type and the dosage of the neutralizing agents on the particle size, apparent viscosity, the stability of the water-soluble polyacrylate colloidal dispersion and water-absorbability of the films was investigated in this paper. And the results of the apparent viscosity determination indicated that the rheological property of the colloidal dispersion was something like Newtonian liquid.