The Preparation Of The Special Wettability Multifunctional Textile And Its Application

With the rapid development of economy and the improvement of people's living standards,the surface of cellulose cotton fabric with good skin affinity,flexibility,moisture absorption,perspiration and other excellent properties cannot meet people's needs.In order to improve cotton fabrics with high-values,it is very meaningful to increase international competitiveness by preparing multi-functional textile surfaces.Inspired by the"lotus effect" in nature,special wettability superhydrophobic surfaces have attracted researchers' attentions.As a type of flexible fabric,cotton textile has good hydrophilicity,drenching,biodegradability and rich resources,etc.,however,it is vulnerable to be polluted by bacterial and microbial,which limits its application in more fields such as antibacterial,ultraviolet protection,self-cleaning,oil-water separation,etc.Therefore,the research for superhydrophobic fabrics become a hot topic that people always discussed.In this dissertation,we are based on the improvement of natural cotton fabric with hydrophilic characteristics,susceptible to oil and water contamination,vulnerable to bacterial and microbial,poor heat stability and resistance to ultraviolet shielding,we put forward a variety of preparation technologies for superhydrophobic textiles,and discussed the preparation technologies,surface morphologies,wettability properties and a series of related applications,specific research results are as follows:(1)The preparation of superhydrophobic cellulose surfaces grafted with environment-friendly short-fluoroalkyl:By using 2-bromoisobutyl bromide(BiBB)as the initiator,and cuprous bromide(CuBr)/pentamethyldiethylenetriamine(PMDETA)as the ligand,the controllable polymerization reaction of the short-chain monomer heptafluorobutyryl chloride was achieved to create flocculated structures,which increased the roughness of the original cotton surface.A "Wenzel" high hydrophobic surface with high adhesion can be found on single grafted fluorinated monomers cotton fabric,by adopting graft-on-graft technology,the as-prepared cotton surface has better anti-wetting ability(WCA=163.7±2.5°),in the surface water droplets to realize rolling(?s=-45°,V=10?L).(2)Multifunctional superhydrophobic TiO2@fabrics for UV shielding,self-cleaning and oil-water separation by water-bath method:We have put forward one-step wet chemical method which called as water bath(T=80?),by using titanium potassium oxalate as titanium source and deposited a layer flower-like micro/nanoparticles Ti02@fabric surface by hydrolytic condensation reaction.The results demonstrated that the titanium dioxide particles were distributed onto the cotton surface evenly,the self-assembly of fluorosilane macromolecules on this surface endowed it with super-antiwetting ability.In addition,the as-obtained cotton fabric had good UV-shielding property with a highest UPF value(50+)when the deposition time was 30 h.Excellent self-cleaning performance and oil-water separation ability,and good mechanical and environmental stability(water pressure,tape-peeling,mechanical abrasion,etc.)(3)“Flower-like" TiO2@cotton with special wettability for effective self-cleaning and oil/water separation by hydrothermal method:For improving the durability of functional superhydrophobic cotton textile,we have further developed a hydrothermal method(120-200?)for the preparation of TiO2@cotton with hierarchical micro-nanoparticles structures.By rational designing experimental program and adjusting experimental parameters,a layer of titanium dioxide film was deposited on the surface of cotton fiber,and the surface had excellent superhydrophobic after further modifying with the low surface energy materials.With the temperature increased,the crystal of titanium dioxide changed from amorphous to anatase,meanwhile the higher of the temperature,the shorter of the time needed for the crystal transformation.We investigated the relationship between surface microstructure and surface wettability such as contact angle,rolling angle and adhesion force and the adhesion mechanism is also explained.Excellent soaping-resistance,UV shielding and self-cleaning ability were achieved and it can also be applied for oil and water separation under various conditions,including oil and water mixture,oil floating on the surface and oil drops under the water.(4)Durable antibacterial and UV-protective Ag/TiO2@fabrics for sustainable biomedical application:Ag/TiO2@fabric antibacterial surface was developed on durable titanium dioxide particles cotton surface prepared by hydrothermal method by in-situ chemical reduction method,the Ag nanoparticles were distributed and embedded into the"flower-like" titanium dioxide micro-nanoparticles structure surface evenly,the synergistic effect of the AgNPs and TiO2 particles has created favorable conditions for the achievement of durable antibacterial and ultraviolet protection properties.We have investigated the antibacterial activity of the composite particle structured surface against for Escherichia coli and Staphylococcus aureus.Meanwhile,a 90%antibacterial rate was realized after 50 cycles of soaping indicating stable and durable antibacterial property of as-prepared cotton surface.The antibacterial mechanism was discussed,many active substances such as·O2-,·OH,photo-generated holes and electrons existed on the surface of AgTiC cotton fabric under visible light,the metallic Ag and ionized Ag ions attached and entered into the bacterial cell's membrane,which hindered the bacterial respiratory system and metabolic system,and eventually led to cell decomposition or death.(5)Special wettability and translucent film coated on glass and cotton substrate via AACVD:A rapid and efficient aerosol-assisted chemical vapor deposition technique was used to deposit hydrophobic PDMS polymer and SiO2 nanoparticles onto the glass or cotton fabric surface by one step to realize the construction of robust superhydrophobic coatings,and the effects of the volume ratio for different precursors,deposition temperature and deposition time on the morphology,hydrophobicity,transparency and mechanical properties of the film were investigated.In addition,the coating exhibited excellent environmental stability and corrosion resistance under chemical effects(acid/alkali solution,organic solvent)and physical effects(tape peeling,sandpaper friction).These demonstrated the AACVD technique are promising for the efficient large-scale production of robust super-antiwetting surfaces.