Abstract:

Siliconated polyurethane (SiPU) emulsion containing the unsaturated double bond was prepared via the solution polymerization,with isophorone diisocyanate (IPDI),polypropylene glycol (PPG),hydroxypropyl termi-nated polydimethyl sioxane (PDMS),trimethylolpropane (TMP),hydroxypropyl methacrylate (HPMA) and dime-thylol propionic acid (DMPA) as main materials.Then,the cross- linking siliconated polyurethane- fluorinated acry-late hybrid emulsion (FSiPUA) was prepared via the radical emulsion polymerization,with SiPU as the seed emul-sion and with butyl acrylate (BA),methyl methacrylate (MMA) and dodecafluoroheptyl methacrylate (DFMA) as the main monomers.Finally,the influences of HPMA,PDMS and DFMA dosages on the emulsion polymerization process and the film properties were discussed,and the PUA emulsion,the SiPUA emulsion and the FSiPUA hybrid emulsion as well as their films were characterized by using a Malvern particle size analyzer and a contact angle me-ter and by means of FT- IR,TG- DSC,XPS and AFM.The results indicate that,when the HPMA,PDMS and DF-MA dosages are respectively 5.2%,7.0% and 20.0%,the FSiPUA hybrid emulsion possesses good water resist-ance and high hydrophobicity,and that,owing to the addition of HPMA,PDMS and DFMA,the thermal stability and mechanical properties of the latex film are greatly improved with a higher surface roughness,a bigger water contact angle,a higher hydrophobicity and a lower water absorption.

Key words: siliconated waterborne polyurethane, fluorinated acrylate, cross- linking siliconated polyurethane- fluor-inated acrylate, hybrid emulsion, latex film, hydrophobicity, thermal stability, mechanical properties