| The fluorine-containing acrylate polymer emulsion has a unique long-chain fluoroalkyl structure, therefore, the fluorined acrylate polymers have many special performances such as excellent chemistry corrosiveness resistant, the weather-resistant, the non-adherence, the low surface energy, the water-repellency, and so on. Fluorined acrylate polymers has a wide range of applications in surface coatings, such as water and oil repellency for textile, paper and leather. However, the relatively high market price of the fluorinated monomers restricts their practical applications. The challenge is how to minimize the amount of fluorinated compositions whereas the reasonable surface properties can be maintained. In this work, fluorined acrylate polymers emulsion was prepared by core-shell emulsion polymerization, miniemulsion polymerization method. The structure and properties of latex film were investigated. The main research contents and achievements are listed as following:1. The structure and preparation method of the fluorine-containing acrylate polymer emulsion were reviewed. The properties, preparation method and applications of nano-SiO2fluorinated polyarcylate copolymer composite emulsion were introduced.2. A fluoroacrylate copolymer emulsion with core-shell structure was synthesized by semi-continuous emulsion polymerization using methyl methacrylate (MMA), butyl acrylate (BA) and dodecafluoroheptyl methacrylate (DFHM) as the raw material and sodium dodecyl sulfate (SDS) and polyoxyethylene octyl phenyl ether (OP-10) as emulsifier. The chemical components, structure and morphology of copolymer were confirmed by FT-IR, DSC and TEM. The surface property and mechanical properties of fluoroacrylate copolymer emulsion films were determined by water absorption ratio, contact angle and tensile testing machine. The influence of the amount of DFHM on the properties of copolymer emulsion and films was studied. The results show that the fluorinated acrylate copolymer emulsion particle shows core-shell structure. Fluorine is concentrated on the surface of the shell, and the film water resistance and mechanical properties are improved greatly.3The soap-free fluorinated polyarcylate copolymer emulsion were synthesized by miniemulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), hexafiuor-obutylmethacrylate (HFMA) as raw materials and ammonium allyloxtmethylate nonylphenol ethoxylates sulfate(DNS-86) as the polymerizable emulsifier. The structure and morphology of the products were confirmed by FT-IRã€1H-NMRã€DSC and TEM. Effects of reaction temperature and concentrations of the emulsifier and initiator on the kinetics of the miniemulsion polymerization were also investigated. The surface properties of the copolymer films were characterized by contact angle and water absorbance measurement. The results showed that the copolymer emulsion has good stability when the temperature is70oC, DNS-86is2.5%, AIBN is0.5%and HFMA is20%. The number average particle sizes of the latexes was180nm and the water resistance of films were markedly improved with the increase of HFMA amount.4. Nano-SiO2particles were coupled with y-(methacryloxy) propyltrimethoxy silane (KH-570), and Nano-SiO2/fluorinated polyarcylate copolymer compounded emulsion were synthesized by miniemulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), hexafluor-obutylmethacrylate(HFMA) as raw materials and sodium doddery sulfate (SDS) as the emulsifier. Exploration of relationship between contents of temperature, emulsifier, initiator and conversion rate showed that when emulsifier(SDS) content was1.5%of the monomer and initiator (AIBN) was1.5%of the monomer at a controlled temperature of70oC, stable and average particle size of approximately150nm emulsion could be obtained. Tests on water absorption, and thermal gravimetric analysis showed that adding nano-SiO2could enhance water resistance and thermal stability of films. |
