A core-shell type nano-SiO2/polyurethane-fluorinated acrylate（SiO2/FPUA)hybrid emulsion was synthesized by seeded emulsion polymerization using polyurethane（PU)as seed

which served as shell phase in the hybrid emulsion mentioned above

with the core phase consisting of nano-SiO2 modified by γ-(methacryloxy)propyltrimethoxy silane（KH-570)

methyl methacrylate（MMA)

butyl acrylate（BA)and dodecafluoroheptyl methacrylate（DFMA).The influence of the amount of nano-SiO2 and fluorine-containing monomer（DFMA)on emulsion polymerization process and surface hydrophobic properties of the latex films were discussed.The nano-SiO2/fluorinated polyacrylate emulsion and the latex film were characterized by Fourier transform infrared spectrum（FT-IR)

transmission electron microscopy（TEM)

contact angle（CA)

thermogravimetry （TG)， differential scanning calorimetry（DSC)and mechanical properties test（MPT）analysis.The results indicated that the latex particles showed a “reverse core-shell” structure

with PA as core and PU as shell

and the hydrophobicity and comprehensive properties of the latex film were greatly improved owing to the synergistic effect of DFMA and nano-SiO2.