Preparation And Characterization Of Asymmetric Structure Hydrophobic Functional Cotton Fabric

The textiles is easy to stain and affect the apparel appearance.So study the fabric with hydrophobic function which have some certain application value.The traditional methods of textile hydrophobic finishing seem often change the original properties of the fabric,and have structural symmetric at reports.The research on asymmetric structure in textile hydrophobic,which was the fabric with different hydrophobicity in the inner and outer layers of the fabric,the inner layer has a superhydrophilic property,and the outer layer has a superhydrophobic property,which was still have its infancy and have a great deal of innovative in research work.Spray-coating is a new method to fabricate asymmetric structure textiles,which is easy to operate and make the finished surface is uniform.This study report a spray-coating technology,the homemade silica were respectively modified with polyvinylidene fluoride and graphene oxide material.By controlling the spraying distance,time and the functional finishing layer on outer surface of the fabric to achieve asymmetric structure fabric.The main research work is as follows:Firstly,silica was made by a sol-gel method,which has a spherical structure.Through the FTIR test analysis which shows the silica surface contains a large number of hydroxyl groups,and the particle size is 205 nm.Using the Nano-sizer test Zeta potential value,which result the silica surface is the negative charge in aqueous solution and the value is-23.7 e V that prove the silica has good dispersion in aqueous solution.Secondly,with homemade silica as a functional finishing agent,PVDF as film forming material.The Si O2 modified with PVDF were uniformly deposited on the outer surface of cotton fabric aided with the robust air flow force from sprayer.The existence of Si O2 could increase the roughness of fabric surface,which could enhance the water-repellent property of the coated fabrics.The results showed that 20 wt.%Si O2/PVDF fabric performed a desirable level of contact angle 136.6° which was the largest water contact angle among all the samples,and the lowest thermal conductivity0.033 W/m K resulting from the existence of Si O2 nanoparticles.Thirdly,with graphene oxide as film forming material,homemade silica as a functional finishing agent.The coating progress was conducted in mild conditions,which is the Si O2 modified with GO were uniformly deposited on the outer surface of cottonfabric aided with the robust air flow force from sprayer,spray-coated the Si O2/GO composites and by low temperature reduced graphene oxide(RGO).The result showed that the 20 wt.% Si O2/RGO fabric have bigger water contact angle at all of samples which was 151.4o,and the superantiwetting stability could reached at 80 minutes.The conductive performance improvement is more obvious,the modified fabric surface resistivity was three orders of magnitude lower than untreated cotton fabric.