Study On Preparation And Properties Of Fluorine-free Superhydrophobic Fabric

Fabric has outstanding mechanical properties,has a wide range of applications in various industries,with the improvement of social living standards,the market demand for multifunctional textiles is constantly expanding,with superhydrophobic multifunctional textiles have been applied in people’s actual production and life.It is of great research significance to use a simple,economical and environmentally friendly method to prepare high-quality,durable multifunctional superhydrophobic fabrics.At present,although the preparation of superhydrophobic fabrics has been widely reported,there are still some problems and shortcomings,such as the cumbersome process of large-scale manufacturing of superhydrophobic surfaces,high preparation costs,the use of fluorine-containing silanes is expensive and has a certain degree of toxicity,easy to cause environmental pollution,the rough structure of superhydrophobic surfaces is easy to lose superhydrophobicity,and the use of organic solvents is not environmentally friendly.Therefore,in this thesis,superhydrophobic fabrics were prepared by a one-step method of ultraviolet light-induced alcohol-ene click reaction,superhydrophobic fabrics with excellent durability were prepared by the crosslinking chemistry of functionalized nanoparticles and polydimethylsiloxane,and superhydrophobic fabrics were prepared on the basis of the preparation of fluorine-free water-based fabric finishing agents,and the surface morphology and element composition,surface wetting behavior,environmental stability and other properties of superhydrophobic fabrics were explored.The specific research content is as follows:(1)In order to quickly and efficiently prepare fluorine-free superhydrophobic fabrics,a fluorine-free superhydrophobic fabric was prepared by photoclicking reaction of highly active isocyanate methacrylate and octadecanthiol with long chain alkyl groups,and grafted on the surface of the fabric.The successful preparation of this superhydrophobic fabric was proved by water contact angle experiment,"silver mirror" phenomenon,and the WCA(water contact angle)of the fabric surface was158°.The surface wettability,surface topography,surface roughness and elemental structure of ODT-IEM@fabric were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM)and photoelectron spectroscopy(XPS).The superhydrophobic fabric can be stripped by tape peeling and sandpaper wear test can maintain its superhydrophobicity,and the surface of superhydrophobic ODT-IEM@fabric fabric has good mechanical stability performance.In addition,superhydrophobic ODT-IEM@fabric fabrics have good stain resistance and self-cleaning ability.(2)In this thesis,a superhydrophobic material was prepared using functionalized nanoparticles and dimethicone.In order to improve the superhydrophobic durability of fabric surface,functional nanoparticles and poly(PDMS)were used to generate bonds.A kind of functionalized silica nanoparticles was prepared by tetramethyldivinyldisilazane,and then filled with polydimethylsiloxane(PDMS)functionalized silica nanoparticles,the strong durable superhydrophobic fabric was successfully prepared.The successful preparation of this superhydrophobic fabric is proved by the contact angle experiment and the "silver mirror" phenomenon,and the hydrophobic angle on the surface of the fabric is 158°.The topology,surface morphology structure,surface roughness and element structure of the fabric were characterized by scanning electron microscopy,atomic Force Microscopy(AFM)and photoelectron spectroscopy(XPS).The surface of the prepared ultra-hydrophobic fabric is well stabilized due to the chemical forces between the particles and the substrate.It can withstand at least 80 cycles of abrasion with 200-grit sandthesis at 10 KPa.The fabric exhibits excellent stability and remains superhydrophobic after UV irradiation,sand abrasion and water impact,tape peeling,and treatment with a strong alkali/acid solution.In addition,superhydrophobic fabric surfaces have been shown to be suitable for anti-fouling and self-cleaning.(3)Starting from the perspective of green environmental protection,prepareing superhydrophobic fabrics is based on PDMS,a water-based fluorine-free superhydrophobic fabric finishing agent was prepared by surface activity,and the superhydrophobic fabric was obtained by dipping on the surface of the fabric.The preparation process of fabric finishing agent is optimized by optimizing and controlling emulsification conditions(emulsifier type,emulsifying temperature,emulsifier dosage,etc.)and construction conditions(nano-Si O2/PDMS ratio,drying temperature,drying time,etc.).The wetting properties of the modified fabric were analyzed by dipping coating to the fabric,and the water contact angle was measured to be 156.0°,which proved the successful preparation of fluorine-free superhydrophobic fabric finishing agent.Experiments have proved that this water-based finishing agent can not only obtain superhydrophobic properties in fabrics,but also obtain superhydrophobic effects on other substrates such as ordinary A4 paper,filter paper,polyurethane sponge,etc.