热辐射对消防服热防护性能及耐久性的影响

为探讨低热辐射对消防服用织物热防护性能及物理机械性能的影响,选用两种常用消防服用外层织物,利用远红外石英灯管辐射仪,以不同的辐射强度(6.5kw/m2和9.7kw/m2)对织物分别进行5、10、20、30min的辐射,利用NI虚拟仪器记录辐射时织物表面温度,并测试其各项物理机械性能及TPP值变化。结果表明:当织物表面温度低于织物纤维玻璃化温度时,织物在半小时内能保持其68.9%～84.6%的撕破强力,且TPP值增大,即热防护性能变好;而当织物表面温度达到纤维玻璃化温度时,织物断裂强力及撕破强力随辐射时间增加显著下降,但其TPP值仍增大。

Effects of Thermal Radiation on Thermal Protective Performance and Durability of Firefighter Protective Clothing

For the purpose of studying the effects of low-level thermal radiation on thermal protective performance and mechanical performance of firefighter protective clothing,two outer shell fabrics used for firefighter protective clothing were exposed to different radiant intensity environments(6.5kw/m2 and 9.7kw/m2).Radiant heat flux was provided by quartz tube radiometer while fabric surface temperature was recorded by NI virtual apparatus.The radiant time was set to 5,10,20 and 30 minutes.Then the parameters used to characterize the mechanical performance and thermal protective performance were tested.The results show that when the temperature of radiant heat environment is higher than glass transition temperature of fabrics,exposure to low-level radiant heat flux causes a significant deterioration in the mechanical performance of shell fabrics.On the contrary,fabric can maintain its 68.9%~84.6% of tear strength in half an hour.It causes an improvement in thermal protective performance following low-level thermal radiation.