Application Of Phytic Acid In Functional Finishing Of Cotton Fabrics

With the improvement of people's living standard,the traditional fabric has been unable to meet the growing demand for functions(such as antibacterial and hydrophobic).Traditional finishing methods,such as plasma etching,hydrothermal treatment and sol-gel method,have many problems as expensive equipment,large amount of raw materials which are difficult for degradation,complicated process and time consumption.Therefore,the green and efficient functional textile finishing method has become a research hotspot.Phytic acid is a kind of green and natural compound,which has a good application prospect in functional finishing of fabrics.This work mainly studies the application of phytic acid in hydrophobic and antibacterial function finishing for cotton fabrics.The specific contents are as follows:By means of the metal chelating ability of phytic acid,insoluble phytic acid-Fe particles were firstly formed on the surface of cotton fiber by cyclic immersing method,and the hydrophobic fabric was then prepared by modifying with polydimethylsiloxane.The surface morphology and composition of finishing cotton fabric were analyzed by scanning electron microscope,atomic force microscope and energy dispersive X-ray energy spectrometer.The stability of finished fabric and its application in oil-water separation were also studied.The experimental results show that the rough structure of nanoscale is deposited on the surface of finished fabric.Increasing the concentration ratio of Fe ions to phytic acid and the immersion cycle times will increase the surface roughness of cotton fiber leading to increasing in water contact angle of finishing fabric.After ultraviolet irradiation,friction,chemical solvent immersion and high temperature treatment,the finished fabric still showed good hydrophobic property which implied excellent durability.The finished fabric can effectively separate various oil /water mixtures,and the separation efficiency can reach more than 95%.After 20 cycles of use,the separation efficiency of oil / water mixtures of n-hexane/water still remains more than 98%.Taking phytic acid as silver ion adsorbent and nano-silver stabilizer,the insoluble phytic acid-Ag particles were formed on the surface of cotton fiber by cyclic immersing method,and the silver ions in phytic acid-Ag complex were then reduced to Ag nanoparticles(NPs)by sodium borohydride to complete the antibacterial finishing of cotton fabric.The surface morphology and composition of finished cotton fabric were analyzed by scanning electron microscopy,energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy.The silver content of finished fabrics was determined by atomic absorption spectrometry,and the effect of silver ion concentration on finishing fabric was studied.The antimicrobial activity and durability against repetitive washing were also investigated in comparison with the fabric without phytic acid treatment.The results showed that the silver nanoparticles were deposited successfully in the treated fabrics,and the treated fabrics with phytic acid treatment deposited more and smaller silver nanoparticles than those treated without phytic acid.The antibacterial activity and laundering durability of the finished fabric are excellent.After 10 laundering cycles,the bacterial reduction rate for functioned cotton fabrics against both S.aureus and E.coli.was still above 99 % and the percentage of silver content loss is only 14.2%.In this work,phytic acid was successfully applied to the function finishing of cotton fabric.The stable superhydrophobic cotton fabric and antibacterial cotton fabric were prepared,which extended the application of phytic acid in the textile industry and provided new ideas for the preparation of functional textiles.