Research on Thermal Protective Performance and Heat-moisture Comfort of Thermal Insulation Flame-retardant Protective Clothing
|School||Zhejiang University of Technology|
|Keywords||Sweating manikin Thermal insulation flame-retardant protective clothing thermal and moisture transmission property Thermal protective performance|
Thermal insulation flame-retardant protective clothing could protect people from high-temperature or flame, in casting industry, the petrochemical industry,fire industry and et al. With the development of thermal protection technology, thermal insulation flame-retardant protective clothing should not only have better thermal protective performance, but also have good wear comfort. However, in the research and development in thermal protective clothing, enhancing thermal protection performance is in contradiction with reducing the heat load of human metabolic. The one requires a good barrier effect of heat according to thermal insulation flame-retardant protective clothing, and another one requires clothing with a certain heat and moisture transfer ability, in order to facilitate body heat loss and sweat evaporation. This paper studied the thermal and moisture comfort and thermal protective performance of thermal insulation flame-retardant protective clothing, based on the sweating manikin“Walter”testing technology and TPP-206 thermal protective performance tester.At first, based on TPP-206 thermal protective performance tester, the TPP value of single and multi-layer fabrics with flame-retardant were measured, and the thermal protective performance of thermal insulation flame-retardant protective clothing was analyzed. The main results show as follow. TPP values of single fabrics do not meet the national standard; even the TPP value of FRC non-woven fabric which is thicker is 21.53cal/m~2. TPP values of multi-layer fabrics all meet the national standard, and the FRC/wool blended fabric is not suitable for fire fighter. Tt is significant that adding the PTFE film, which is intolerant fire, could improve the overall thermal protection performance. It is the most observable effect to put the PTFE film between the outer layer and the insulating layer.Secondly, this paper made a modifier formula of thermal insulation and moisture resistance measured by sweating manikin“Walter”. The thermal insulation of clothing ensembles on the dry manikin“Tore”in Sweden and sweating manikin“Walter”were compared. The sweating from manikin "Walter" is the evaporation through the clothing the moisture absorbed by clothing materials and the condensation on the clothing. The modified thermal insulation formula is: R_d=((T_s-T_e)×A)/H-E×Q_pMeanwhile, the paper amended the formula of moisture resistance: R_e=A×(p_s-p_e)/H_e=A×(p_sf×RH_s-p_ef×RH_e)/E×Q_pThirdly, based on the operating environment of thermal insulation flame-retardant protective clothing, this paper set two test environment, normal environment (the ambient air temperature of 20℃and relative humidity of 65%) and high temperature (the ambient air temperature of 33℃and relative humidity of 50%). By sweating manikin“Walter”testing techniques, paper studied heat and moisture transfer properties of thermal insulation flame-retardant protective clothing in the high temperature. The main results show as follow.①Thermal insulation and moisture resistance of clothing are affected by environmental temperature and humidity. In the high temperature, the thermal insulation of thermal insulation flame-retardant protective clothing is smaller, and the moisture resistance is higher. Referring to the thermal insulation and moisture resistance of clothing in ambient air temperature of 20℃and relative humidity of 65%, the body thermal injury from the hot of environment is less than the actual. The more vapor accumulated between the skin and clothing causes the human body to obtain the heat from environment. ②Based on thermal insulation formula and effective thermal insulation formula, it is calculated the effective thermal insulation, intrinsic thermal insulation and that accumulated value of each layer. Then he statistical relationship of the effective thermal insulation (intrinsic thermal insulation) of a multi-layers clothing ensemble and that of each layer has been definite.It is helpful for designing the protective clothing that the thermal protective performance and heat and moisture comfort of thermal insulation flame-retardant protective clothing were studied in this paper. It is innovative that the formula of thermal insulation and moisture resistance in sweating manikin“Walter”was modified. It has developed the sweating manikin“Walter”testing technology.