| With the improvement of consumption level,dressing concept for people has already changed.The demand for clothing is not only simply to pursue the appearance and durability of the clothes,but also to expect the clothes with more excellent comfort.In the hot season,it is an urgent need to improve the moisture absorption and self-cooling function of fabrics,which is of great significance for textile research and development.This paper first summarizes the research status of moisture-absorbing and self-cooling fabrics.Based on the heat conduction and moisture transfer mechanism of the fabric,the factors affecting the thermal conductivity and moisture permeability of the fabric are described.The heat transfer mainly depends on the heat conduction within the fabrics.The heat conduction property can be indicated by the heat conductivity coefficient.The moisture transfer between the fabrics is mainly affected by the capillary effect which can be improved by increasing the difference in the hydrophilic and hydrophobic properties on both sides of the fabric.Cotton fiber is a natural cellulose fiber with excellent performance.Although it has good hygroscopicity,the moisture permeability is poor and thermal conductivity is low.In this paper,the cotton fabric is treated by a two-step finishing process of nano-ZnO finishing and single-sided discontinuous hydrophobic finishing.Firstly,the cotton fabric was dipped into dispersing a uniform nano-ZnO dispersion,and then the cotton fabric was subjected to one-side discontinuous hydrophobic finishing by a screen printing process to prepare a unidirectional water-transfer fabric with excellent moisture absorption and cool performance.To solve the problem of easy agglomeration of nano-ZnO,which would affect the finishing effect of fabrics,this paper uses titanate coupling agent and dispersant to disperse nano-ZnO solution under ultrasonication.Through investigating the nano-ZnO dispersion process,a uniform and stable dispersion with an average nano-particle size of 320.2 nm and PDI of 0.159 was prepared.The influence of different factors such as mass concentration of nano-ZnO finishing solution,immersion time,baking temperature and baking time on fabric properties was explored.By testing the UV resistance of the fabric,the optimal finishing process of nano-ZnO on cotton fabric was obtained.The morphology and microstructure of cotton fabric treated with optimal finishing process was observed by SEM,FTIR and XRD,and the loading of nano-ZnO on cotton fabric was proved.In order to obtain a fabric with excellent unidirectional water-transfer performance,this paper designed three screen printing patterns with different pro-hydrophobic ratios.The performance of the cotton fabric treated with the two-step finishing process was analyzed by MMT,wicking height,evaporation rate and the like.The comprehensive analysis show that the cotton fabric has better thermal comfort when the proportion of the hydrophobicity pattern is 50%,and the accumulative one-way transport index of the cotton fabric with the finishing pattern was 380.37%,indicating the fabric has a good unidirectional water-transfer performance.By testing the thermal conductivity and the cool feeling of contact of the cotton fabric after the two-step finishing process,it is found that the finished cotton fabric has better thermal conductivity,which was 50%higher than the thermal conductivity of the original cotton.The qmaxax value of the fabric is 0.184 J/?cm2·S?,implying that the fabric has a contact-cooling property.By simulating the thermal conduct between of cotton fabric with human body,the temperature of the fabric surface was measured using FLIR infrared camera.It is found that the cotton fabric after two-step finishing process has a better thermal conductivity.The other physical properties of the finished fabric such as whiteness and bursting strength were tested.The results show that the whiteness of the fabric is not affected by the finishing process,but the bursting strength is slightly decreased. |
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