Synthesis of fluoro-acrylate emulsion with core-shell structure and its application on cotton fabric finishing

A poly-fluoro-acrylate emulsion with core-shell structure was synthesized with poly( butyl acrylate-co-methyl methacrylate as the core,and poly( butyl acrylate-co-methylmethacrylate-co-bis( acry loxypropyl) tetramethyldisiloxane-co-tridecylfluooctylacrylate as the shell,via starved-semicontinuous seed emulsion polymerization. The morphology and thermostability of the core-shell latex particles and the influences of fluorine content and the amount of cross-linked agent on water-repellency,oil-repellency and surface characteristics of finished textile were investigated by Fourier transform infrared spectroscopy( FT-IR), X-ray photoelectron spectroscopy( XPS), transmission electron micro-scopy( TEM),thermogravimetry( TG) and contact angle( CA) analysis. The results showed that fluorine monomer and cross-linked agent were involved in co-polymerization with acrylic monomers,and the particle size of emulsion with obviously core-shell structure was about 76 nm. Moreover,when the fluorine content and the amount of cross-linked agent in core-shell copolymer latexes were 6. 7% and 3%,respectively,the water-and oil-repellency of cotton fabric treated with fluorinated latex reached 80 points and level 5,respectively,and contact angle was up to 138. 2°. Water-and oil-repellency and thermal stability of the finished textile have been improved with the introduction of siloxane cross-linking agent.