Study On The Preparation And Properties Of Human Skin-like Directional Water Transport Fabric With Printed Pattern

The humidity of skin surface is an important factor affecting human comfort,which is significance to human health,textile design.Functional textiles with self-actuated directional water transport can effectively reduce the excessive humidity caused by humid environment and human sweat,thereby improving the psychological comfort of the human body in a high humidity environment.Therefore,it is necessary to develop functional textiles that can effectively improve the thermal and moisture comfort of clothing.At present,the common preparation methods of directional water transport fabric are divided into direct forming and fabric finishing.In the former method,fabric is directly formed by knitting or weaving technology,but its directional water transport property still needs to be improved.In the latter method,fabric has better wet performance,but it has some problems such as poor interlayer bonding force and poor durability of fabric,which lead to its practical application is limited.In order to solve the problems,this research prepared high-performance fabrics with superhydrophilic pore structure by simulating the sweat gland channel structure of human skin.Through hydrophilic modification and screen printing technology,uniformly distributed superhydrophilic pores were successfully constructed on the surface of the printed fabric.In addition to obtaining a directional water transport fabric with excellent comprehensive consumption performance,a large-size preparation of the fabric was realized.The main work of our research contains the following contents:（1）Hydrophilic modification of substrate is realized by alkali treatment and pectinase treatment.The effects of different alkali concentrations and pectinase concentrations on the surface groups,morphology and contact angle of textiles were studied,and the relative optimal concentration parameters were determined according to the results.The results show that both alkali treatment and pectinase treatment can achieve hydrophilic modification effect on the substrate,while high concentration alkali treatment is better.When 5 wt%pectinase and 60 g/L Na OH solution are used to modify the fabric at the same time,successfully prepare the required super hydrophilic substrate.In addition,the effect of different types of hydroxyl-terminated polydimethylsiloxane（PDMS）after grafting with 3,3,3-trifluoropropyltriethoxysilane（fluorosilane）was investigated.The results showed that the cotton fabric treated with PDMS that has higher molecular weight had better hydrophobicity.Therefore,based on principle of wetting gradient unidirectional wetting fabric,the hydrophilic modification of fabric substrate and the pretreatment of hydrophobic printing on fabric surface were successfully studied.（2）In order to construct the skin-like structure of printed fabrics,the selection and proportion of printing paste and the influence of related process parameters on screen printing were explored.In order to improve the directional water transport property of the printed fabric,the surface morphology,wettability,moisture permeability,air permeability and overall moisture management capability of fabrics are analyzed.The experimental results show that a good printing process can be carried out when the concentration of PDMS/fluorosilane buffer is 25 wt%.The influence of printing process parameters on the performance of the fabric was further studied,and the experimental results showed that with the increase of printing pressure,the directional water transport of fabrics is worse,and the moisture permeability and air permeability are better.On the contrary,when the printed area increasing,the better the directional water transport of fabrics is,the worse the moisture permeability and air permeability of the fabrics are.The comprehensive performance parameters S₁ and S₂ were introduced to evaluate the comprehensive performance indicators of the fabric,and when the printing pressure is 30 Hz and the printing pattern area is 90%,S₁ and S₂ of the fabric are optimal respectively.Finally,under these process parameters,a directional water transport fabric with skin-like structure was successfully prepared,and its micromorphology,element composition and distribution were characterized.（3）The performance of the directional water transport fabric printed on human skin was comprehensively tested and evaluated.The results show that the functional fabric has achieved its ideal application effect:the air permeability is 104mm·s^-1,the moisture permeability index is 298 g·m^-2·h^-1,the unidirectional water transmission index（R）is as high as 721%,and the maximum impermeable water pressure was 3.31k Pa.In addition,experiments show that after washing for 25 hours,the R of the skin-like printed directional water transport fabric is always at a high level（R>660%）,which has good washing resistance.