| Smart heating clothing has the advantages of controllable heating temperature,environmental protection,repeated use,and easy wearing.It provides warmth for people living and working in low-temperature environments.However,most heating garments have the defects of complex preparation process,low temperature control accuracy and single function.Flexible temperature-sensitive heating elements are the core components of intelligent heating clothing,and have broad market prospects in the fields of thermal clothing,physical therapy and health care.The screen printing method can be used to produce flexible temperature-sensitive heating elements in large quantities and at low cost.In this paper,the screen printing method is used to prepare the temperaturesensitive heating fabric as the flexible temperature-sensitive heating element,and its electrothermal performance and temperature-sensitive performance are systematically studied.The effects of curing temperature and curing time on the electrical,thermal and aging properties of the silver paste prepared by the screen printing method and heating fabric are studied.The curing temperature is 110℃,and the curing time is 40 minutes.The curing reaction of the conductive silver paste coating can be completed.The resistance value change rate was 10.82% after aging for 1000 h after being energized by 2.0 V.The conductive silver paste heating fabric can withstand the maximum current of 0.45 A,and it can be heated to 105℃.The heating temperature can be changed by controlling the power of the heating circuit.By changing the printed circuit to adjust the resistance of the flexible heating element,the surface temperature of the circuit with a width of 3 mm is more uniform after heating.The electrothermal performance of the silver paste heating fabric is analyzed by thermodynamics and heat transfer theory,and a thermodynamic mathematical model is established.The relationships between the heating temperature,current,resistance and time in the steady state and the transient state are derived.The deviation of calculated and measurement value is only 1.42%.The finite element model and mathematical model of the electrothermal of the silver paste heating fabric are established to simulate the surface and air field temperature distribution,which is used to guide the circuit design and electrothermal performance analysis of the heating fabric,which can save a lot of experimental materials and experimental time.The graphene oxide(GO)film is prepared based on the screen printing method,and the reduced graphene oxide(Lr GO)film is prepared by the reduction of the GO film by the laser reduction method to prepare a flexible temperature sensor with high sensitivity,fast response rate,high resolution and stable performance,which could be integrated into the temperature sensing heating fabric with silver paste heating fabric.Study the influence of laser power,scan interval,scan rate and scan times on the degree of GO reduction.After polydimethylsiloxane encapsulation,the Lr GO temperature sensor has a temperature resistance coefficient of-0.421%/℃ in the temperature range of 0℃-80℃,and the resolution and response time are 0.29℃ and 4.5 s,respectively,and have good repeatability.And stability,both electric heating performance and temperature-sensitive performance,can be applied to clothing and human body temperature monitoring.The silver paste heating fabric prepared in a simple and environmentally friendly manner and the temperature-sensitive heating fabric integrated with the reduced graphene oxide flexible temperature sensor can reach a comfortable temperature of the human body under low voltage.Temperature can be controlled by power density and temperature can be monitored in real time and has a very high market value. |
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