Chemical Modification Of Carbon Fabric And Its Application In Electrothermal Conversion

Human beings live in a variety of environments,and more and more workers need to be engaged in cold and low-temperature work,and human's own regulatory function cannot enable human beings to survive in the harsh and low-temperature environment.The heating products are mainly made of solar energy heating materials,phase change materials,chemical energy heating materials and electric heating materials.Whether it is using solar energy light storage elements that can absorb visible and infrared light,using phase-change temperature-controlled materials to store energy,or using chemical reactions to generate heat to keep warm,there are some disadvantages such as uncontrollable temperature and narrow application fields,which make it difficult to meet the requirements of keeping warm in cold and low-temperature environments.Electric heating textiles have attracted much attention because of their fast heating rate,and the application of far-infrared radiation mechanism has accelerated the development of electric heating textiles.The far-infrared radiation electric heating fabric is an ideal material choice in the field of electric heating due to its advantages of safety,reliability,high electric heating conversion efficiency,so the development of fresh far-infrared radiation carbon fabric has a broad development prospect.In this paper,the carbon fabric was modified by dopamine biomimetic modification,and then the far-infrared radiation carbon fabric was prepared by far-infrared finishing process.Finally,the far-infrared radiation carbon fabric was obtained by compounding the carbon fabric,polyester cotton fabric and electrode piece.The effects of the reaction conditions of dopamine on the surface modification of carbon fabrics and the ratio of far-infrared finishing solution on the far-infrared properties of carbon fabrics were systematically investigated.It was found that the dopamine-bionic modification had a good modification effect on the smooth surface of carbon fabric and the absence of active groups.When the dopamine concentration was 6g/L,the reaction time was 8h and the reaction temperature was 25?,the polydopamine layer on the fabric surface was uniform and complete,which could be used for the preparation of far-infrared radiating carbon fabric.It was also found that 30%Tourmaline@PDA@CF,9%ZrO₂@PDA@CF and 15%Medical Stone@PDA@CF had the best far-infrared performance among several different far-infrared finish solutions.The change of resistivity,temperature-time and temperature-voltage of the composite fabric under current condition were investigated,and the electrothermal conversion efficiency of the far-infrared carbon fabric was studied.According to the study,30%Tourmaline@PDA@CF,9%ZrO₂@PDA@CF,15%Medical Stone@PDA@CF composite fabric can maintain the average surface temperature at 58.3?,60?and 59.5?respectively under the input voltage of 10V.Under3V voltage,the temperature of far-infrared radiant carbon fabric is raised from 25?to 31?,which belongs to the range of temperature that makes human body comfortable.9%ZrO₂@PDA@CF composite fabric consumes the least electrical power per unit temperature,indicating that the fabric has the highest electrothermal conversion efficiency.The far-infrared radiative carbon composite fabric prepared in this study has shown excellent thermal performance such as safety,resistance stability,temperature controllability,high electrothermal conversion efficiency,exhibiting very good development prospect,which can be widely used in the fields of personal warmth,medical devices,wearable flexible electronics,etc.