论文部分内容阅读
采用种子乳液聚合法,以聚氨酯(PU)乳液为种子(在聚合过程中为壳相),甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸十二氟庚酯(DFMA)和γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH-570)改性的纳米SiO2组成的混合物为核相,合成了具有核壳结构的纳米SiO2/聚氨酯-含氟丙烯酸酯(SiO2/FPUA)复合乳液。考察了纳米SiO2和DFMA用量对乳液聚合过程及乳胶膜性能的影响。通过傅里叶红外光谱(FT-IR)、接触角(CA)、透射电子显微镜(TEM)、热重(TG)、差示扫描量热仪(DSC)和力学性能测试(MPT)等表征乳液的结构形态、乳胶膜的表面性能和综合性能。结果表明:乳胶粒子呈现“反相核壳”结构,以聚丙烯酸酯(PA)相为核,PU相为壳;由于纳米SiO2和DFMA的协同作用,涂膜的疏水性和综合性能得到了较大的提高。
The seed emulsion polymerization was carried out using polyurethane emulsion as seed (shell phase during the polymerization), methyl methacrylate (MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA ) And γ-methacryloxypropyltrimethoxysilane (KH-570) modified nano-SiO2 was used as the core phase to synthesize a nano-SiO2 / polyurethane-fluoroacrylate / FPUA) composite emulsion. The effects of the amount of nano-SiO2 and DFMA on the polymerization process and the properties of latex films were investigated. The emulsion was characterized by Fourier transform infrared spectroscopy (FT-IR), contact angle (CA), transmission electron microscopy (TEM), thermogravimetry (TG), differential scanning calorimetry (DSC) and mechanical properties testing (MPT) The structure and morphology of latex film surface properties and overall performance. The results show that the latex particles exhibit “inverted nucleus shell ” structure, with polyacrylate (PA) phase as the core and PU phase as the shell. Due to the synergetic effect of nano-SiO2 and DFMA, the hydrophobicity and comprehensive properties of the coating A big increase.