Study On Directional Moisture Conductive,antibacterial And Antifouling Cotton Fabric Based On Spatial Infiltration Gradient And Its Application

There are a large number of microorganisms in our living environment,and germs,as a category of microorganisms,are extremely diverse and numerous,and are extremely easy to come into contact with human bodies,posing a great threat to human health and life safety.In the past two decades,from SARS pneumonia,H5N1 avian influenza in Southeast Asia,H1N1 influenza A,MERS,Ebola virus,and then the new crown pneumonia outbreak just earlier this year.With the globalization of the economy,people are coming into closer contact with each other,diseases are spreading more and more frequently,and every year,new serious infectious diseases caused by germs bring serious economic losses and population deaths.Medical cotton surgical gown as the most widely used medical supplies,but due to the good moisture absorption of cotton fabric,resulting in its easy to breed bacteria,vulnerable to liquid contamination,can not achieve directional fluid transfer.In this project,we prepared an efficient and durable antibacterial and anti-soiling cotton fabric with skin-like function of directed liquid transfer by antibacterial finishing,superhydrophobic modification and plasma treatment from cotton fabric,which can keep good wearing comfort in wet environment by repelling external liquid while draining internal sweat in time.The main research includes the following areas.The antibacterial finishing of cotton fabric by alternate impregnation with phytic acid solution and copper sulfate solution as finishing agents provided a Cu-rich surface for the cotton fabric and prepared antibacterial cotton fabric with Cu complexes having efficient and long-lasting antibacterial activity.Its antibacterial activity against both Escherichia coli and Staphylococcus aureus can reach over 99.99%.In addition,the prepared Cu complex antibacterial cotton fabric also has high bactericidal efficiency and good antibacterial durability,with a bactericidal efficiency of up to 99.95%against E.coli in 2 hours and99.99%against S.aureus in 2 hours.After 50 washes,the antibacterial activity of Cu complex antibacterial cotton fabric against E.coli and S.aureus remained above 99.95%.After 50 washes,the antibacterial activity of Cu complexes against E.coli and S.aureus remained above 99.95%in the antibacterial cotton fabric.The Cu complex antimicrobial cotton fabric was superhydrophobically modified by chemical vapor deposition using trimethyl monochlorosilane and tetrachlorosilane,and the modified contact angle was as high as 155.06°with good superhydrophobicity and self-cleaning properties.The antibacterial and stain-resistant cotton fabric prepared has good stain resistance to various liquids such as deionized water,cola,fruit juice,and aqueous methylene blue solution.Selective treatment on the superhydrophobic surface of antibacterial stain-resistant cotton fabric by patterned compressed air plasma treatment grafted hydrophilic polar groups（e.g.,hydroxyl,carboxyl,etc.）to the exposed areas of the fabric,increased the surface energy of the fabric reduced hydrophobicity,and constructed a skin-like definitive wettability fabric（S-P/PA-Cu）with a dotted wettability gradient in the fabric thickness direction.The fabric has good directional liquid transfer performance.When water drops are dropped on the dotted wetting gradient channel of the fabric,the drops can be quickly transferred to the other side of the fabric when following the wetting gradient due to the Laplace force,while in the reverse wetting gradient,the drops are blocked from being transferred to the other side.The drip experiment allows continuous irreversible directional liquid transfer,with a continuous water supply,99.77 s can complete a complete transfer process.In addition,the directional liquid transport properties of S-P/PA-Cu cotton fabrics have good irreversibility and high-water transport rates due to the wetting gradient channels.The Laplace force generated by its inverse wetting gradient can withstand a pressure of 15cm water column height（1500 Pa）;its water flux can reach 95492.97 L·m^-2·h^-1 at the downward wetting gradient.S-P/PA-Cu cotton fabric also maintains high air permeability in the wet state.Due to its good water repellency and dotted wetting gradient channels,S-P/PA-Cu can effectively prevent being wetted by water in the wet state,and when the phenomenon of directional liquid transfer occurs,the lint in the dotted wetting gradient channels closely adheres to the yarn and fiber under the action of water transfer force,increasing the porosity of S-P/PA-Cu cotton fabric and reducing the resistance to air flow.In addition,through simulated human sweating experiments,it is proved that S-P/PA-Cu cotton fabric can effectively discharge the internal water in time.This concept opens the way for the development of advanced multifunctional fabrics that can maximize the wearing comfort of cotton fabrics in humid and hot environments and can effectively inhibit bacterial growth,making it a promising development in the field of medical protection.