Abstract: A prepolymer was prepared by reacting the obtained sulfonated polyester polyol with isophorone diisocyanate(IPDI) and trimethylolpropane(TMP). The seed emulsion containing viny and silicone was prepared by end-capping with bifunctional monomer β-hydroxyethyl methacrylate(HEMA) and modification by silane coupling agent γ-aminopropyl triethoxysilane（KH550). The silicone modified sulfonated polyurethane/acrylic composite emulsion was obtained by mixing methyl methacrylate(MMA) and butyl acrylate(BA) monomers. The silicone modified sulfonated polyurethane/acrylic composite emulsion was characterized by infrared spectroscopy. The core-shell structure of the composite emulsion was confirmed by the transmission electron microscopy. Thermogravimetric analysis showed that an increase of 20 ℃ of the largest thermal mass loss temperature could be observed for the organic silicon and acrylic modified films. Meanwhile, the crystallinity was decreased as revealed by X-ray diffraction result, which could help to improve the toughness of the film. In addition, when the organic silicon content is 1.9%, the tensile strength of the film is up to 25.03 MPa, its elongation at break is 328%, and has the lowest water absorption.

Key words: polyester polyol, waterborne polyurethane, acrylates, silicone