Synthesis, Application And Mechanism Of Polyurethane Modified Fluorinated Polyacrylate Soil Release Agent

Fluorinated polyacrylate can provide a good water and oil repellent properties for fabrics, but the finished fabric was difficult to wash after being contamined, therefore, to develop a novel agent which have good water repellent, oil repellent and soil release properties is becoming the research hotspot in the world. If the polyether urethane chain segments containing polyether groups being in the fluorinated polyacrylate molecules may resolve this problem. Based on this, this papar used molecular design principle to synthesize a novel soil release finishing agent polyurethane modified fluorinated acrylate, the structure, the application and the film-forming ability of the products are studied by infrared spectrum(IR), 1H nuclear resonance spectrum(1H-NMR), 13C nuclear resonance spectrum(13C-NMR), scanning electronic microscope(SEM) , field emssion scanning electron microscope(FESEM), X-ray photoelectron spectroscopy(XPS) , atomic force microscope(AFM),etc. The main results are shown as follows:(1)A novel soil release finishing agent polyurethane modified fluorinated acrylate(FPUA) is prepared by the copolymerization of hydroxypropyl acrylate(HPAA) and dodecafluroheptyl acrylate(FA) in the medium of polyurethane solution(PU) using of azobisisobutyronitrile(AIBN) asinitator and with butanone oxime(EtAO) as a blocking agent. The chemical structure, film-forming ability of FPUA and its application on fabrics were characterized and investigated by infrared spectrum(IR), 1H nuclear resonance spectrum(1H-NMR), 13C nuclear resonance spectrum(13C-NMR), scanning electronic microscope(SEM) and other instruments. The result indicated that the agent can form a smooth film with excellent hydrophibocity, the fluorine groups enriching at the fiber-air interface make the contact angles of water and salad oil on the cotton fabrics increase to 146.5°and 132°. And when the dosage of FPUA is 1.5g/100mL H2O and the finishing process is at 100℃baking for 5 minutes and then at 180℃for another 2 minutes, the hydrophobicity can reach to 95, the oil-repellent grade and the soil-release grade are 6 and 4, respectively.(2)A novel cationic fluorinated acrylate modified polyurethane hybrid latex(FEPUA) was prepared by the copolymerization of hydroxypropyl acrylate(HPAA) and dodecafluroheptyl acrylate(FA) in the medium of polyurethane solution(PU) by the initiation of azobisisobutyronitrile(AIBN) via phase inversion polymerization with N-methyldiethanolamine(MDEA) used as a hydrophilic chain-extender. The chemical structure and film-forming ability of FEPUA as well as its application on fabrics were characterized and investigated by infrared spectrum(IR), transmission electron microscope(TEM) , scanning electronic microscope(SEM) and other instruments. The result indicated that with acetone as solvent agent, the nNCO:nOH was 1.3, the MDEA and FA content was 6.5% and 8%, the hybrid latex possessed a core-shell structure and good performance,And when the dosage of FEPUA is 1.5g/100mL H2O, the hydrophobicity can reach to 80, with the oil-repellent grade and the soil-release grade all being grade 4.(3)FPUA was used as film-forming materials, then film morphology, precise strctures and orientations of these materials on silicon wafer and natural cotton fiber substrate were studied and investigated by X-ray photoelectron spectroscopy(XPS) , scanning electronic microscope(SEM) , field emssion scanning electron microscope(FESEM) and atomic force microscope(AFM) and other instruments. Results indicated that fluorinated chain block is incorporated into macro molecule chain of the polymer successfully, FPUA can reduce the average roughness of cotton fiber surface effectivelly and make it smooth.In the scan range of 1×1μm2, observe the ruler for the 5 nm under the conditions, FPUA could form a non-homogeneous and rough structural film on the surface of silicon wafer.