Plasma Treatment On The Performance Of Inkjet Printing On Antibacterial Silk Fabrics

Silk is a light,comfortable,lustrous and elegant natural high-grade fabric with good moisture absorption,breathability and biodegradability,and is widely used in high-grade clothing and home textile fabrics because of its good taking properties.In order to achieve its higher wearability and aesthetics,printing research on silk fabrics has proliferated in recent years.For a long time,the clarity,printing effect and pattern colour fastness of silk products with printing and dyeing treatment are generally poor,which limits the use and development of silk to a certain extent.In traditional methods,inkjet printing of reactive dyes on silk fabrics generally needs to be achieved in alkaline conditions and usually requires a colour fixation reaction.The traditional pre-treatment method of colour fixation is sizing,but the use of a large number of chemical reagents can cause pollution and also to some extent affect the soft,comfortable fabric style of silk fabrics.As a new technology for textile material modification,plasma treatment technology is fast,efficient,clean,energy-saving and widely applicable.By etching,chemically modifying and cross-linking the surface of fibres through plasma jets,it can give textiles new good properties or overcome certain shortcomings of textiles themselves while keeping their original good properties undamaged,and has been widely used in recent years for In recent years,it has been widely used in the surface modification treatment of textiles.Chitosan is purely natural,easy to extract,non-toxic and has good biocompatibility and biodegradability,and is a new high-tech green material.Fabrics treated with chitosan have obvious antibacterial properties,anti-wrinkle properties and good dyeing properties,which in turn improve the fabric’s taking properties.This paper combines plasma cleaning technology with nanochitosan surface finishing technology to produce a clean,non-polluting and durable biocoating,mainly for inkjet printing technology of reactive dyestuffs on silk fabrics,to improve the performance of inkjet printing and antibacterial properties of silk fabrics while avoiding the pollution caused by traditional sizing treatment.The details and findings are as follows.Firstly,this paper focuses on the surface treatment of silk fabrics using plasma and the preparation of strong and durable bio-based coatings using nano-chitosan to improve the inkjet printing performance and antibacterial properties of their reactive dyestuffs.The optimum time for plasma treatment was found to be 5 min through controlled experiments,and the surface properties of the treated fabrics were analysed.It was found that the treatment process not only changed the surface morphology of the fabrics,but also the content of chemical elements on the surface of the fabrics,and the oxygen-containing groups on the plasmachitosan treated silk fabrics increased by more than 42%.The time to infiltrate the droplets on the fabric surface was reduced from 3.55 s to 0.29 s after the modification,but there was no significant change in the mechanical properties of the fabric,its breathability and its whiteness.Secondly,the printing and anti-bacterial properties of the fabric were analysed and tested.The effect of the plasma treatment time on the printing performance was analysed through controlled tests and the printing performance of the treated fabric was tested and evaluated and it was found that the treated printed fabric had good impermeability and the colour depth of the four colours increased by 76% to 214% and had a high washing and rubbing fastness The plasma-chitosan-treated fabrics showed good inkjet printability even after 45 cycles of soaping.Comparative experiments revealed that the plasma-chitosan treated fabric printed better than the traditionally sized inkjet printed fabric.Finally,the fabrics were tested and found to have significant and long-lasting antibacterial properties against Bacillus subtilis.The experimental process also explored the effect of plasma ageing on the inkjet printing performance of the fabrics and found that the wetting performance,inkjet printing permeability and colour fastness of the fabrics decreased with increasing exposure to air after the plasma treatment.The final effect on the fabric properties does not decrease to the same extent as before.Analysis of the experimental results led to the conclusion that the plasma treatment increased the surface roughness and wettability of the fabric and grafted chitosan onto the fabric surface,creating a robust and durable biofilm.In terms of physical properties,the plasma-chitosan treatment did not cause any damage to the physical properties of the fabric and the style,comfort and strength of the fabric were not significantly altered.The plasma treatment grafted chitosan molecules onto the surface of the fabric so that the chitosan,which adsorbs dye molecules and has antimicrobial properties,was firmly anchored on the surface of the fabric,resulting in better inkjet printing performance and higher antimicrobial properties in the treated fabric,with greatly improved K/S values,impermeability and wash fastness of the fabric inkjet printing and significant antimicrobial properties against Bacillus subtilis.The fabric was also significantly antibacterial against Bacillus subtilis.Finally,plasma ageing tests have shown that the time between the plasma treatment and the next step in the fabric treatment process should be kept as short as possible,i.e.within 12 h of the plasma treatment.