一种可自交联有机硅乳液的制备

Preparation of A Self-Crosslinkable Organosilicone Emulsion

通过苯乙烯乳液聚合成种子,再在种子核外生成苯乙烯与甲基丙烯酸-3-三甲氧基硅丙酯(MPS)的共聚物,形成核-壳型乳胶粒,从而得到自交联型的水分散涂料。这种含硅涂料能在涂覆过程中发生自交联反应,不仅有效提高了涂层的光滑度、耐候性和耐沾污性,更减少了可挥发性有机溶剂(VOC)的排放量。通过透射电子显微镜(TEM)和动态光散射仪(DLS)研究了反应条件对所得乳液型涂料稳定性的影响,发现在MPS参与的乳液共聚合过程中,需选用离子型乳化剂,保持介质pH值在7左右,控制MPS浓度来提高乳液稳定性,防止乳胶粒聚并。并用红外光谱(FTIR)和29Si固态核磁谱(NMR)表征了所得聚合物的微结构。

The self-crosslinking water-dispersible coating was obtained from core-hull structure latex particles which were first formed by polymerization of styrene emulsion to seeds, and then formed by copolymerization of styrene with 3-trimethoxysilyl propyl methacrylate（MPS） outside seeds core. The self-crosslinking reaction can take place during coating with such silicone-based coating. It can effectively increase the smooth degree, weather-resistance, pollution-resistance of coating layer and decrease release of volatile organic solvents. The effects of reaction conditions on stability of emulsion-type coating were studied by using TEM and DLS. It is found that it is needed to use ion-type emulsifiers, control pH value of medium at about 7 and MPS concentration so as to increase emulsion stability and prevent latex particles from agglomeration during MPS emulsion copolymerization. The microstructure of obtained polymer was characterized by IR and ^29Si-NMR spectrum.