Preparation,characterisation and properties of waterborne fluorinated polyurethane acrylate/SiO 2 hybrid

Abstract

Waterborne fluorinated polyurethan acrylate dispersion was prepared from the polyether polyol, isophorone diisocyanate, dimethylpropionic acid, hexafluorobutyl acrylate and trimethylolpropane triacrylate as monomers. Then, the prepolymer containing alkoxysilane Si(OR)₃ was synthesised from dispersion and coupling agent methacryloxypropyl trimethoxy silane. The Si(OR)₃ group was hydrolysed and reacted with different content tetraethoxysilane hydrolysis solutions in via hybridisation and gelatinous. A series of waterborne fluorinated polyurethane acrylate/SiO₂ hybrids were prepared by sol–gel technique. The physical properties of dispersion such as storage stability, viscosity, particle size and surface tension were measured. The results indicated that all the prepared dispersions showed acceptable storage stability. The mechanical properties such as tensile strength, elongation at break and hardness and chemical resistance such as water absorption and acid resistance of the films were investigated. The hybrid materials were characterised using Fourier transform infrared, SEM and X-ray diffraction. The obtained hybrid materials have great potential application such as coatings, adhesion, leather finishing, adhesives, sealants, plastic coatings and wood finishes.