Synthesise,Characterizatioil And Application Of Waterborne Polyurethane Modified By Fluorinated Acrylate

Waterborne polyurethane is wildly used in adhesion, leather, textile, coating etc for its higher strength, better elasticity good toughness,wear-resisting resistance, curing in room temperature, lower MFT. Besides, it’s nonpoisonous and environmental, so it’s becoming the orientation in the future material development. However, in the present market, there are also some disadvantages in waterborne-polyurethane, especially the water and heat resistance, is also inferior. Recently, technicians and scientific research personnels have acquired many achievements on enhancing the water resistance of waterborne polyurethane through modified it with acrylate, organic silicon, organic fluorine, etc. However these researches stay studying in laboratories for the obvious blemish on the stability of emulsion and compatibility of the film. Once the popular technology of mixing different resins is being replaced by fresh resins for its bad compatibility and short of matching. Therefore,enhancing the water resistance, improving the stability of emulsion and advancing the compatibility are the problems of waterborne polyurethane being faced to resolve urgently now.In this paper, the FPUA hybrid emulsion (waterborne-polyurethane modified by fluorinated acrylate) was synthesised by emulsion polymerization with core-shell structure. On the basis, the effects on the emulsion latex and film performance were systematicly, which includes the methods of acrylate pre-emulsified, the contact between core and shell, the types of initiator, the amount of fluorinated emulsifier, the quantity of fluorinated acrylate etc.In the test, FT-IR(fourier transform infrared spectrum) and TEM (transmission electron microscopy) were used to character the organic structure and the mophology of emulsion particles, and the surface morphology, the atomic composite, the thermal stability, surface energy and the mechanical properties of the film were studied by AFM(atomic force microscopy), XPS(angle-resolved X-ray photoelectron spectroscopy),CA(contact angle), TGA(thermal gravimetric analysis) and DSC(differential scanning calorimetry). The results showed,20wt%fluorinated acrylate,0.3wt%fluorinated emulsifier were used in the emulsion polymerization, with AIBN as initiator, the morphology of emulsion latex particals shows obvious core-shell structure and in uniform size. The latex has good stability and the film shows good compatibility and low surface energy. The surface energy inclined from45.6mN/m to22.5mN/m, at the same moment, the heat assitance was improved in high level. With amount of1.5wt%finishing agent, water repellency of the cotton textile scores100, the oil repellency reaches grade6.