Synthesis And Research Of Acrylate Copolymer Emulsion Containing Fluoro-silicon And Amino Group

In this thesis, the development of emulsion polymerization theory and related newtechnologies are comprehensively reviewed, and the synthetic technologies offluorine-silica containing acrylate latexes both at home and abroad are also reviewed.Based on the current development and research in this field, attention of this study arefocused on using amino containing silane coupling agent and fluorine containing organicsilicone to modify the acrylate monomers by emulsion copolymerization for preparingnovel acrylate latex.The major raw materials used to synthesize fluorine-silica containing acrylate latexare vinyltriethoxysilane (VTES), Γ-aminopropyltriethoxysilane (KH550),1,3,5-trimethyltris (3,3,3-trifluoropyropyl) cyclotrisiloxane (D3F) and acrylate polymers. Asmall fraction of organic silicon fluorine and amino groups were incorporated into acrylicmain chains via copolymerization. The effect of emulsifier contented proportion, theconcentration of initiator, reaction temperature, monomer content on the emulsioncopolymerization are studied through measuring the monomer conversion and the latexparticle size etc. The results showed that the above factors can affect the stability of theemulsion copolymerization and the performance of the latex film.In addition, cationic emulsifying (CTAB) and nonionic (TX-10) were mixed used tomodify the polymerization of silica-containing fluaroacrylate copolymer emulsion.Influence of the mixed-emulsifying on the mechanical properties of latex film and stabilityof emulsion were studied.The best reaction process is obtained through the orthogonal experiment as follows:reaction temperature is80℃, amino-silane coupling agent dosage was4%, cationic andnonionic emulsifier dosages are both1%, Silicon and fluorine monomer dosage is25%.The obtained emulsion has been tested by infrared, transmission electron microscopy (TEM), the particle size analysis and thermal weight. The results show that the emulsionparticle size is about125nm, the Tmax is480℃. When the emulsion is coated on silk, thewater contact angle reached above120°.The results demonstrated that the composite latex is indeed successfully preparedusing the semi-continuous synthesis technique, and the water absorption tests of latex filmsconfirmed that the modified acrylate polymers possessed higher waterproof abilitycompared with the pure acrylate polymers.