有机硅改性丙烯酸酯共聚乳液合成方法及胶膜性能的研究

用一次投料法、单体乳液滴加法和引发剂滴加法有机硅改性丙烯酸酯共聚乳液，聚合过程、胶粒形态及乳液稳定性的观测结果表明：单体乳液滴加法是合成该类乳液的最佳方法，研究了单体乳液滴加法中有机硅含量与聚合反及胶膜性能的关系，结果表明：有机硅含量在１５％以下时，聚合反应可以顺利进行，胶膜性能不仅依赖于聚合时有机硅单体的总量，而且还依赖于有机硅单体中活性硅氧烷所占的比例。

Synthetic Methods of Acrylate Polymer Latexes Modified with Organosilicons and Their Film Properties

Acrylate copolymer latexes modified with organosilicons were prepared using monomer emulsion addition process, batch and initiator addition processes, The results of particle morphology and latex stability, obtained from different copolymerization processes,showed that stable latex can be produced only by monomer emulsion addition process.Mechanisms of the emulsion polymerization were discussed.Films were casted from diluted latexes. Hardness, water absorption, solubility in THF of various films were also studied, it was found that polymerization and filmproperties are significantly influenced by organosilicon content.The cross-linking density of copolymers was increased and water absorption decreased with increase in organosilicons. Keeping the total organosilicon content constant (MATS+D4 at 10%by weight) and with increasing D4/MATS, latex film hardness was seriously diminished when D4/MATS was below 1, and a slow decrease was observed whenthis ratio was above 1.