Study On Generation Of Low Temperature Plasma And Surface Modification Of Wool Fabric

As one of the important natural fibers in the textile industry,wool fiber has many superior characteristics such as excellent warmth retention,good elasticity and soft luster,which is usually used to produce luxurious clothing.However,the presence of scales on the surface of wool fiber results in its poor wettability,dyeability and shrinkage resistance.A most direct and effective way to improve the performance of wool fiber is to modify its surface The low temperature plasma treatment has the advantages of high efficiency,energy saving and environmental friendliness.At the same time,it can modify only the surface of the treated material without affecting its bulk properties.With the further study of low temperature plasma generation,atmospheric pressure glow discharge shows great advantages.The aim of this paper is to propose a method for generating a large-area glow discharge plasma with high-activity,which is not limited to material thickness.The surface modification platform of atmospheric glow discharge plasma is built,and the modification effect of plasma under different conditions is explored.Firstly,in this study,the contact electrode structure is used to sandwich the treated material between the electrodes.The effect of the thickness of the treated material on the discharge characteristics is investigated through discharge experiments,and the cause of the formation is analyzed in combination with the dielectric field theory.Based on the goal of breaking through the thickness limitation of the treated material and expanding the generation area of the plasma,a wire-array electrode structure is proposed.Combined with simulations and experiments,the effects of the treated material and the parameters of the electrode structure on the discharge characteristics are investigated.A uniform and stable atmospheric pressure glow discharge plasma s successfully generated,and the effective act on wool fabric can be realized.Secondly,in order to further improve the plasma activity and realize the directional effect of the plasma on the surface of the treated material,a lamellar electrode structure is proposed,which can realize the generation of a large-area glow discharge plasma with high activity.The electric field distribution in the discharge air gap formed by the lamellar electrode and the wool fabric,as well as the plasma generation and action conditions are analyzed via the electric field simulation software Ansoft Maxwell.Based on the unit electrode structure,the effects of the electrode parameters,the thickness of the treated material and the dielectric constant on the electric field distribution are investigated.With the optimal electrode structure parameters,the discharge characteristics of the lamellar electrode are analyzed.The asymmetry of the discharge current in single dielectric barrier discharge is discussed,and the discharge power density in the actual discharge is calculated.Finally,based on the glow discharge plasma generation technology proposed in this study,a plasma material treatment platform is built,and the wool fabric is modified.Through the changes of the surface morphology and the surface chemical composition of wool fiber,as well as the wetting property of fabric,the influence of plasma treatment conditions on the modification effect is analyzed in detail.The results show that the scales on the surface of wool fiber are effectively destroyed and the polar groups are introduced to the surface of wool fiber after the 120s plasma treatment.The the wetting time is reduced from more than 1800 s to less than 0.5 s,which indicates that the wettability is greatly improved.In addition,based on the lamellar electrode structure,the design scheme and optimization idea of large-scale surface modification device are put forward.