| China’s potential catastrophic accidents such as explosion,fire,high-pressure steam,high-temperature liquid splash in modern industrial production,social life and military anti-terrorism activities are continuously increasing.The common thermal protective clothing in China mainly consists of multi-layer fabric structure by layer stacking or compounding to protect the safety of employees in relevant environment.However,due to the heaviness of traditional thermal protective clothing,it will cause physiological heat stress from three aspects of heat dissipation,metabolic rate and activity performance,and thus affect the work efficiency and decision-making ability of the wearer.Therefore,it is an inevitable trend for the development of modern protective clothing with light weight,excellent thermal comfort and protective properties to provide better safety for employees.The aerogel material has a special continuous network with connecting hole structure,has excellent thermal insulation performance,and at the same time can lighten the weight of the protective fabric system to a certain extent.Moreover,the moisture permeability and air permeability of aerogel material are superior to the traditional thermal protective fabric,reducing the probability of heat stress.Graphene aerogels have the advantage of high specific surface area,high porosity,high electrical conductivity,good lateral thermal conductivity and mechanical strength.On the one hand,under thermal exposure,graphene can rapidly conduct heat and reduce heat accumulation on the fabric surface.On the other hand,the aerogel structure can better block the heat transfer from outside to the internal skin.Based on the drawbacks of domestic and foreign research and the needs of domestic development,this study aims to construct a new type of thermal protective clothing system with graphene aerogels,which can reduce the weight of traditional protective clothing,and at the same time improve the comfort and comfort of clothing.A kind of graphene aerogel was prepared,and a composite protective fabric system was developed,consisting of the outer layer,waterproof breathable layer,graphene aerogel and insulation layer.The heat insulation performance and thermal and moisture comfort of the fabric system were investigated in terms of the carbon fiber content(0%,10%),the graphene concentration(5wt%;7wt%;10wt%)and the graphene aerogel height(6mm;8mm;10mm).The results showed that the weight of graphene aerogel was only 1/7 of the insulation layer in the same size.Under exposure to low radiation condition,graphene aerogels effectively improved the thermal protective performance of the fabric system,and there were significant effects in terms of different carbon fiber content,graphene concentration and aerogel height on the thermal protection index such as temperature rise of 12 elsius degree,temperature rise of 24 celsius degree and maximum temperature difference.The interaction effect between concentration and carbon fiber content is significant,and the interaction effect between concentration and height is significant as well.Among them,the fabric system with 10%carbon fiber,7wt%carbon fiber and 8mm high showed the best thermal protection performance.Based on the thermal resistance,evaporative resistance,permeation efficiency and water vapor transmission to evaluate the thermal and moisture comfort performance of different fabric systems.It was found that the fabric system with carbon fiber content of 10%,concentration of 7wt%and height of 8mm had the best thermal and moisture comfort performance.The research results of this study will provide guidance for developing lightweight thermal protective clothing with excellent thermal and moisture comfort and protective properties,and improve the present situation of the traditional thermal protective clothing with poor weight and comfort.It provides a way and inspiration for the development of lightweight thermal protective clothing based on graphene aerogel materials. |
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