Preparation Of Fluoroalkyl Acrylate Co-polymer With Controllable Structure And Its Application On Fabric Finishing

In this dissertation, fluoroalkyl acrylate co-polymer with controllable structure wasobtained by emulsion copolymerization and core-shell copolymerization. Fluoroalkylacrylate was used as functional monomer, and the unsaturated monomers such as butylacrylate (BA), methyl methacrylate (MMA), hydroxyethyl acrylate (HEA) and so on, wereused as co-polymeric monomers. The preparation procedure of these fluorine containingfinishing agents was optimized and the resulted finishing agents was applied on fabrictreatment, the relationship between the co-polymeric structure and performances werestudied systematically.Firstly, emulsion finishing agent of fluoroalkyl acrylate co-polymer was prepared. Theinfluences of cross-linking agent, whose structure and dosage, on the crosslink degree offluorine containing copolymer were investigated. In our experiment, using fluoroalkylacrylate monomer (TEAC-N), methyl methacrylate (MMA), butyl acrylate (BA) andhydroxyethyl acrylate (HEA) as monomers, SDS and AEO-9as the complex emulsifier,and organosiloxane containing bisacrylate as the cross-linking agent, lightly crosslinkedfluoroalkyl acrylate copolymer were synthesized by traditional emulsion polymerizationmethod. The result showed that the average particle size of fluoroalkyl acrylate copolymeremulsion with cross-linking structure was about138.33nm and the emulsion had goodstability when the addition of cross-linking agent was1%(wt). The resulted emulsionfinishing agent can provide with the water-and oil-repellency of level2-3and level2respectively on cotton fabric. The contact angle of treated fabric was up to134.3°. It wasfound that the water-and oil-repellent efficiency of the fluorine containing emulsion canbe obviously improved by introducing of appropriate cross-linking agent.Secondly, a fluoroalkyl acrylate emulsion with core-shell structure was prepared withpoly(butylacrylate-co-methylmethacrylate) to be the core, and the copolymer ofbutylcrylate, methylmethacrylate, bis(acryloxypropyl)tetramethyldisiloxane andtridecylfluooctylacrylate to be the shell by using polymeric emulsifiers DNS-86. Theparticle size of core-shell emulsion with excellent stability was found to be about60-70nm when the fluorine content and the amount of cross-linked agent were controlled to be6.7%and3.0%respectively. The core-shell emulsion was applied on cotton fabric finishing withwater-repellency of80points, and contact angle was up to130°.After washing20times,the water contact angle of the finished cotton fabric retained at120°.Lastly, inorganic-organic composite emulsions with core-shell structure were preparedwith SiO2, whose sizes can be monitored by controlling the hydrolysis reaction of TEOS,as core and fluoroalkyl polyacrylate as shell. The emulsions were applied on cotton fabricfinishing, and the water-repellency and thermal stability of the treated cotton fabric wasfound to be improved to a large extent, as compared to that treated with fluoroalkylacrylate emulsion. The contact angle of the cotton fabric treated with SiO2/fluoroalkylacrylate emulsions was up to132.69°. In addition, in the current work, a kind of rod-likenano-ZnO was prepared via hydrothermal method followed by rod-ZnO/fluoroalkylacrylate core-shell emulsions preparation. Compared with the microspheres ZnO, therod-ZnO/fluoroalkyl acrylate core-shell emulsions can obtain a higher contact angle withup to137°when treating cotton fabric. To the contrast, the UV resistance of treated cottonfabric of microspheres ZnO emulsion was better than that of rod-like ZnO emulsion.