硅烷改性氟代聚丙烯酸酯乳液的制备及其氟碳涂层表面性能

Preparation of silane modified fluorinated polyacrylate emulsion and its surface properties of nano-coatings

摘要:

在阴/非离子表面活性剂作用下，将甲基丙烯酸十二氟庚酯（DFMA）与丙烯酸月桂酯（LA）、甲基丙烯酸羟丙酯（HPMA）及γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPMS）在水相进行乳液共聚，合成了一种硅烷改性氟代聚丙烯酸酯（DLHK）乳液。用红外光谱（IR）、核磁共振氢谱(1H-NMR)和透射电镜（TEM）等对DLHK的结构及乳液的物化性能进行了表征和测定。再将DLHK乳液制备成氟碳涂层，考察温度、乳液用量对涂层表面性能的影响。结果表明DLHK乳液具有核壳结构、平均粒径为131nm、Zeta电位为-24.09mV。当固化温度为150℃、乳液用量为25g时，所得涂层性能最佳，与水的接触角达128 o，表现出良好的拒水效果。

Abstract:

A fluorinated polyacrylate (DLHK) emulsion was prepared by copolymerization of dodecafluoroheptyl methacrylate (DFMA), lauryl acrylate (LA), 2-hydroxypropyl methacrylate(HPMA) and 3-(methylacryloxyl)propyltri- methoxy silane (MPMS) in the presence of anionic/nonionic surfactants. The structure and physicochemical properties of DLHK were characterized by Infrared spectrum (IR), 1H-nuclear magnetic resonance (1H-NMR) and Transition electron microscopy (TEM). Then the DLHK emulsion was utilized to prepare the fluorocarbon coating and effects of temperature and dosage of emulsion on surface properties of coating were discussed. Results show that the DLHK latexes possess core-shell structures with an average particle size of 131nm and zeta potential of -24.09 mV. The coating displays favorable water repellency and water contact angle on its surface is 128°when dosage of emulsion and curing temperature are 25g and 150℃, respectively.