Synthesis Of Silica-containing Fluoroarylate Copolymer Emulsion And The Study Of The Performance

In this thesis, the development of emulsion polymerization theory is comprehensively reviewed, and the synthetic technologies of acrylate latex modified by organic silicone fluorine both at home and abroad are reviewed. A series of stable organic silica-containing fluoroarylate elastic latex were prepared by preemulsified addition in high sheering, and the performance of the product was studied.The major raw materials used to synthesize organosilicon-acrylate latex are octamethylcyclotetrasiloxane(D4),1,3,5,7,-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane(VTS), 1,3,5-tris(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclotrisiloxane(D3F) and acrylate. A small fraction of organic silicon fluorine side groups were incorporated into acrylic main chains via copolymerization. The hydroxyl oligomer organic silicon fluorine was then grafted to the main chains via the condense reaction of D4 with hydrolyzed organic silicon fluorine groups. The effect of surfactant system, initiator, temperature, cross linking monomer, ratio of acrylate and content of siloxane on the stable polymerization process were investigated, therefore, the basic processing parameters and production formula were determined. The composition and properties such as particle morphology, particle size and its distribution of the obtained silica-containing fluoroacrylate latex were characterized. The effect of organic silicon fluorine monomer content on the performances of resulting latex film was investigated by the transmission electron microscopy photographs, the scanning electron microscopy photographs, particle size distribution and FT-IR, the results show that the general mechanic performances of the latex film are improved with the increase of silicone content in monomers. Meanwhile, ability of water and oil resistance of the film improved with the increase of fluorine content in monomers, and the latex film has excellent performance when the silicone fluorine content get to 20% of total monomers.In addition, nonionic fluorocarbon surfactant(FS-300)was used as reactive surfactant to modify the polymerization of silica-containing fluoroacrylate copolymeric elastic emulsion. Influence of FS-300 on the mechanical properties of latex film and stability of emulsion was studied. Testing results showed that FS-300 used as reactive surfactant could reduce the content of conventional emulsifier, because FS-300 molecule can combine the surface of particles with covalent bond, which increasing the stability of latex to a great extent.Meanwhile, the emulsion film prepared has good extension strength and elastics when the content of FS-300 in the reactive system get to 1.5%.