Fabrication Of Asymmetric Wetting Fabric And Liquid Directional Transport Performance

With the technological progress and the improvement of people’s living standard,people’s demand for the properties of textiles is also being updated and iterated,putting forward higher requirements for its green technology,multi-functional application and added value of products.Functional textiles are new textiles with both basic performance and special functionality,which are widely used in different fields such as consumption,household,industrial and military.Asymmetric wettability textiles can be realized with liquid directional control,fast water conductivity,fog collection and other functions,which are favored by users.However,asymmetric wettability textiles are often prepared by fabric finishing process or non-woven process,which is a complex and technically challenging production process.At the same time,there are fewer studies to achieve targeted liquid regulation based on fabric weaveability,especially for woven fabric structures.This not only limits the functional construction of asymmetric wettability textiles,but also limits the possibility of their transition to mass production in the industrial field.In order to enrich the research on the preparation process and functionality of asymmetric wettability textiles,this paper selects green superhydrophobic polyester yarn and hydrophilic cellulose yarn.Combining the"morphology"property（surface and structure）and"quality"property（wettability）of fabric,we explore the preparation process of asymmetric wettability woven fabric,seek the conditions to strengthen the"quality"property（unidirectional water transfer capacity and fog collection）of fabric,and explore the theoretical mechanism to achieve directional liquid control of fabric.Firstly,green non-fluorinated poly（divinylbenzene）（co-MBAA-PDVB）hydrophobic agent and polydimethylsiloxane（PDMS）coupling agent were utilized to superhydrophobically modify polyester yarns.The micro and macro structures and wet management properties of superhydrophobic polyester yarns and hydrophilic cellulose yarns were investigated.The results showed that the superhydrophobic polyester yarns were successfully prepared with a contact angle of more than 159°and the wicking height of 0 cm.The capillary channels formed by the yarn arrangement could enhance the water conductivity of hydrophilic and water-conducting yarns.The hydrophobic yarn with a spacing of 1 mm has the best mist collection behavior.The yarn wet management performance test laid the foundation for the subsequent preparation of asymmetric wettability fabrics.Secondly,this paper combined fabric structure design and differential wettability material configuration to fabricize asymmetric wettability Janus fabrics.A total of six viscose and cotton fabrics with satin weave,weft double weave and stitching double were prepared.The effects of different yarn types and fabric structures on the wet management properties and single water conductivity of the fabrics were investigated.The results show that the viscose type fabric with weft double weave can achieve unidirectional water transport within 4s and its cumulative unidirectional transfer capacity can reach 980%,with fast drying ability and good heat and moisture transfer response,providing a cool and comfortable wearing experience.Finally,fog collection fabrics with pointed twill weave,square check weave,cord weave,and honeycomb weave were designed by mimicking the pro/hydrophobic region on the back of the desert beetle.The single-sided asymmetric wettability patterned fog collection fabrics with regularly distributed triangular,square,rectangular and hexagonal shapes on the surface were successfully prepared.The results show that the 6 h fog collection rate of the single-sided asymmetric cord weave fabric can reach 1983.3 mg·6h^-1·cm^-2,which is equivalent to 79.3 L of freshwater resources per day for 1 m²of 3#fabric,and the fog droplet capture efficiency is 27.2%.In order to further adjust the fog collection performance,the above-mentioned fog collection fabric is modified with single-sided superhydrophobic finishing,and the double-sided asymmetric wettability fog collection fabric is prepared.The results show that the fog collection efficiency of double-sided asymmetric convex strip organization fog collection fabric is improved by 43.2%,and the fog collection rate of 6 h can reach 2840.2 mg·6h^-1·cm^-2.