Abstract:

The core-shell polyacrylate emulsion containing fluorine and silicon in the shell was synthesized by semi-continuous seeded emulsion polymerization in the presence of reactive anionic emulsifier, using methyl methacrylate (MMA) and butyl acrylate (BA) as principal monomers, dodecafluoroheptyl methacrylate (DFMA) and γ-(methacryloxy)propyltrimethoxy silane (KH-570) as functional monomers.The influences of the amount of fluorine and silicon monomers on emulsion polymerization process and surface hydrophobic properties of the latex films were discussed, and the surface free energies of prepared emulsion films were calculated.The fluorinated-silicated acrylate emulsion and their films were characterized by Fourier transform infrared spectrum(FT-IR), differential scanning calorimetry (DSC), thermogravimetry (TG), contact angle (CA) and X-ray photoelectron spectroscopy (XPS) analysis.The results showed that fluorine and silicon monomers had effectively copolymerized with acrylic monomers and a gradient distribution in the latex films was formed.The deioned water contact angle for film-air interface is 110.6° and the surface free energy is as low as 15.4 mN·m^-1,when the amount of DFMA and KH-570 is 16% and 5%,respectively.Both the hydrophobicity and thermal stability of the emulsion films were greatly improved.