丙烯酸酯共聚物无皂水溶胶流变性能的研究

STUDY ON THE RHEOLOGICAL PROPERTY OF WATER-SOLUBILIZED ACRYLICS

合成了不含均聚物的丙烯酸酯四元共聚物(MMA/BA/AA/HEMA)。用GPC测定了共聚物的分子量及分子量分布。将共聚物中的羧基中和后制成无皂水溶胶。研究了水溶胶的流变性、表观粘度与剪切速率关系、表观粘度与固含量关系。所得无皂水溶胶涂料具有较优异的性能。

A copolymer without homopolymer has been prepared form methyl mcthacrylate, butylacrylate, acrylie acid and β-hydroxyethyl metacrylate. The molecular weight and the molecular weight distribution of the copolymer were determined by GPC.The water-solubilized acrylics was obtained by neutralizing 60% of the carboxyl groups of the copolymer, and its rheological behavior, dependence of apparent viscosity on the shear rate as well as on the solid content have been studied. The paint obtained by mixing the water-solubilized acrylics with solidifying agent hexamethoxymethyl melamine (20%) and acidic catalyst PTSA (0.5%) has a well-qualified property.