Preparation And Properties Of Moisture-heat Phase-change Composite Fiber Material

With the progress of global industrialization,the demand for energy is gradually increasing.Latent heat storage technology based on phase change materials has been widely studied and applied due to its advantages of high energy storage density and small temperature change range.Adsorbing the phase change material through the three-dimensional porous material can not only solve the problem of phase change material leakage,but also effectively improve the thermal conductivity and thermal stability of the material,thereby broadening its utilization in various fields.In modern society,clothing should meet the demands of both beauty and warmth.Therefore,the development of lightweight and warm functional fabrics has great research significance and application potential.Moisture-heat fabrics absorb water vapor in the microenvironment of the human body,and convert the kinetic energy of water molecules into heat energy to keep warm,so it has a good market prospect.This study combined biological culture,physical adsorption,fabric finishing and other methods to prepare a moisture-heat phase-change composite material.The three-dimensional framework material was used to adsorb the phase change material,the moisture-heat fabric and the phase-change composite material can effectively improve the heating time of the moisture-heat fabric.Firstly,the bacterial cellulose was prepared by the biological culture method,and the bacterial cellulose film prepared by freeze-drying was used as the base material,and then the phase change composite BC-PCMx was prepared by adsorbing the phase change material n-octadecane by the vacuum impregnation method.Structure and properties of the prepared materials were tested and analyzed by means of various characterizations.The specific surface area of the BC film prepared by freeze-drying reached 29.84 m~2/g,which provided a good three-dimensional framework for phase change materials;the DSC and leakage-proof tests showed that BC-PCM81 has good leakage-proof performance,and the corresponding melting/crystallization enthalpy reached 183.7/190.3 k J/kg;the temperature rise and fall test and infrared thermal images of BC-PCM81 indicated that the temperature rise and fall rate of BC-PCM81 was significantly lower than that of BC,which revealed that the BC-PCM81 had great temperature adjustment effect.Secondly,the bacterial cellulose film treated with the carboxylated multiwalled carbon nanotube solution was used as the base material,the c-MWCNTs/BSA@BC-PCMx phase change composite was prepared by vacuum impregnation method.Structure and properties of the prepared materials were tested and analyzed by means of various characterizations.The specific surface area of c-MWCNTs/BSA@BC was significantly increased to 40.34 m~2/g,which provided a good three-dimensional framework for phase change materials;the thermal conductivity tests showed the thermal conductivity of c-MWCNTs/BSA@BC treated by 2%c-MWCNTs solution increased by 320%compared with the thermal conductivity of pure BC;the temperature rise and fall test and infrared thermal images of c-MWCNTs/BSA@BC-PCM81indicated that the temperature rise and fall rate of c-MWCNTs/BSA@BC-PCM81 was greatly lower than that of c-MWCNTs/BSA@BC and higher than that of BC-PCM81,which proved the temperature adjustment function of the composite material,and revealed that the thermal conductivity of c-MWCNTs/BSA@BC-PCM81 was significantly improved.Finally,the pure cotton knitted fabric was used as the base material,and the moisture-heat fabric was prepared by finishing with the moisture-heat agent WARM926 and the cross-linking agent AF6100,then the moisture-heat and phase change composite material was prepared by sewing the moisture-heat fabric with the c-MWCNTs/BSA@BC-PCM81 phase change material.Structure and properties tests showed that the mechanical properties and wearability of the moisture-heat fabric were almost unchanged.When the finishing agent concentration was10%WARM926 and 10%AF6100,the moisture-heat fabric had the highest moisture-heat value and the best washing resistance performance.Compared with the moisture-heat fabric,the average heating value in 60 minutes of the Fare/c-MWCNTs/BSA@BC-PCM81 composite increased by 0.4?,which proved that the addition of the phase change material can effectively extend the heating time of the moisture-heat fabric.The DSC,temperature rise and fall and infrared thermal imaging tests of the composite material found that the heat storage efficiency of the composite material can reach 35.9%,which revealed that the composite has a good application prospect in the field of heat storage and temperature regulation.