【作者】 卢业虎；

【导师】 李俊；

【作者基本信息】 东华大学 ， 服装设计与工程， 2013， 博士

【摘要】 加强热功能防护材料和服装的研究是国家安全发展和振兴纺织产业的重要举措之一。当前热防护服装的研究主要集中在火焰和热辐射等方面的防护性能。然而,消防、石油化工、食品加工等行业的工作人员还遭受高温液体和蒸汽的伤害。传统的热防护服装能否提供有效的高温液体防护性能,保证劳动者的职业健康与安全,是关乎公共安全防护的重要课题。防护服装的防护性能不仅取决于纤维材料与织物的基本物理性能,还与服装的设计特征和合体性等因素有关。本课题正是基于以上需求探索高温液体环境下热防护服装的热湿传递规律,预测服装的防护性能。论文首先从热防护织物层面,研发了新型的高温液体防护性能测试仪,利用该仪器研究了织物基本性能、暴露液体种类以及衣下空气层对织物高温液体防护性能的影响与作用机制,并进一步探讨了影响织物冲击渗透性能的主要因素,阐明了高温液体环境下织物的热湿传递规律；其次从热防护服装整体层面,提出了新型的服装合体性表征方法,全面分析了热防护服装衣下空气层的分布规律；此外,建立了喷淋假人测试系统,探讨了高温液体喷溅环境下服装热湿传递和皮肤烧伤及分布规律；最后,分析了织物实验与假人着装实验之间的联系,建立了服装高温液体防护性能的预测模型。具体的研究内容概括如下：1)热防护织物的高温液体飞溅物防护性能研究课题研发了新型的织物高温液体飞溅物防护性能测试仪器,其创新点主要包括恒温液体循环加热箱和液体传送装置、液体流量控制钮、皮肤模拟传感器及其分布和皮肤烧伤预测程序。选取了常用的7种热防护服用材料,利用研发的测试仪器评价了热防护织物的防护性能,揭示了高温液体环境下织物的热湿传递规律。织物暴露于高温液体飞溅物时,热传递方式主要包括织物表面的对流传导、织物内的热传导和湿传递(液体和蒸汽传递)引起的能量传递。不透性和半透性面料的防护性能明显优于可透性面料,对于不透性面料和半透性面料,面料的厚度决定了其热防护性能；对于可透性面料,减小液体冲击渗透性可以明显地提高其热防护性能。研究证明液体的渗透性是影响热传递和皮肤烧伤的关键因素之一。面料的表面性能和液体的粘度影响液体在织物中渗透性。液体的热扩散性能、湿传递的速率和传递的总量是影响织物系统热防护性能的重要因素。直接暴露于高温液体流位置的皮肤烧伤比其它位置的烧伤严重。2)织物液体冲击渗透性能影响因素研究基于AATCC42-2000织物液体冲击渗透性测试标准,利用上述的高温液体防护性能测试仪器建立了新型的液体冲击渗透性测试方法,从织物特征、液体的温度、液体的种类、冲击角度和面料配伍等方面深入地探索了影响织物液体冲击渗透性的主要因素。研究结果表明具有较高润湿阻力的面料提供优良的防液体吸收和渗透性;液体的冲击渗透性随液体温度的升高而增加；液体的渗透性取决于液体的动力粘度,液体的粘度越大,其渗透量越小,而储存量越大;液体与面料的冲击角度明显地影响液体的渗透性能;添加隔热层可以显著增加液体的储存量,降低液体的渗透量,添加防水透气层后,总的液体储存量明显小于添加隔热层时储存的液体量。3)空气层对织物内热湿传递性能的影响研究衣下空气层对热防护服装热湿传递性能具有重要的作用。本论文制作了6mm空气层垫片,研究了衣下空气层对织物热湿传递性能的影响。研究表明高温液体环境下,传递至皮肤的热流量取决于面料的性能、液体的性能和测试条件,面料的表面能对热防护面料的热湿传递性能具有重要的作用,不同的液体对皮肤造成不同的伤害,与测试条件也有关;衣下空气层可以显著地降低吸收的总能量,延长二级烧伤的时间,提高织物的热防护性能。空气层对不同织物的热湿传递作用不同,空气层可以减少液体的渗透和蒸汽的传递,显著地提高可透性织物的防护性能；但对于疏水性的可透性面料,蒸汽可以透过润湿的面料并传递至传感器后冷凝释放大量的能量,极大地削弱了空气层对热防护性能的有益作用。4)热防护服装衣下空气层的表征选取了10种当前典型的工业用热防护服装,利用三维人体扫描仪获得着装前后的三维人体点云数据,通过Rapdiform系列软件开发了一套系统的处理三维人体扫描数据和测量服装衣下空气层的方案,并从服装的面料性能和尺码等方面探索了服装平均衣下空气层、各部位空气层厚度和空气层的整体分布规律。服装与人体之间的空气层尺寸取决于人体的几何特征、面料的物理性能和服装的尺码。人体凸面的空气层比凹面的空气层尺寸小；人体部位的围度越大,其空气层相对越小。面料的克重越大,其衣下空气层厚度越大；面料的抗弯刚度越大,衣下空气层尺寸越大。服装的尺码越大,人体各部位的空气层和平均衣下空气层也越大。衣下空气层在人体表面呈不均匀分布。腿部和腰腹部的空气层尺寸较大,而胸部、臀部和手臂处的空气层尺寸较小。5)喷淋假人着装防护性能研究基于燃烧假人测试系统,构建了喷淋假人测试系统,全面地分析了织物基本性能、服装设计特征和服装尺码等因素对服装热湿传递和皮肤烧伤分布的影响。所测试的服装根据其提供防护性能可以分为七类,半透的和不可透的服装系统的防护性能明显优于可透的服装；面料的厚度对不可透和半透性服装的热防护性能具有一定的影响；面料的克重对服装的热传递性能影响甚微；服装的防水整理对其防护性能产生非常重要的影响。服装的尺码对热防护服装的防护性能具有一定的影响,但并不明显。紧身服装与宽松服装之间的防护性能具有显著性差异,但它们与合体服装提供的防护性能之间并没有明显的差异。减少透过服装的湿传递是提高其防护性能的关键因素；保持服装和人体之间的空气层厚度也是提高服装热水喷溅防护性能的重要因素。服装的设计特征影响服装的热防护性能,增加服装的层数可以显著地提高其热防护性能,反光带可以对人体皮肤提供额外的防护。皮肤烧伤分布并不均匀,主要发生在高压热水喷溅直接冲击的部位(胸部和腹部)、水流较大的部位(腰臀部和大腿)和空气层较小的部位。服装的平均衣下空气层厚度与整体烧伤、吸收的总能量呈明显的负线性关系。在所测试的服装中,衣下空气层分布与皮肤烧伤之间具有一定的负线性关系。人体各部位平均衣下空气层厚度与皮肤烧伤百分比呈负相关关系。除了盆骨处以外,其它部位空气层厚度与皮肤烧伤的相关性显著(P<0.05)。对于特定的服装来说,人体各部位空气层厚度与皮肤烧伤之间没有明显关系。进一步分析发现除G5以外,人体上肢各部位空气层厚度与皮肤烧伤呈负相关性。6)热防护服装高温液体防护性能预测针对面料实验和假人着装实验中获得的指标进行相关性分析,结果表明：无空气层时面料实验得到的二级烧伤时间与吸收的总能量显著地线性相关；假人实验获得的皮肤烧伤百分比与吸收的总能量也显著地线性相关；无空气层时面料实验与假人实验中获得的指标之间具有明显的非线性关系；有6mm空气层时面料实验与假人实验中的指标呈显著的线性关系。建立了热防护服装皮肤烧伤百分比与平均衣下空气层和面料的二级烧伤时间之间的回归方程,即PBI=97.671-2.597*T2-1.84*AAG。该模型表明在测量了面料的二级烧伤时间和服装的衣下空气层厚度的前提下,可以准确地预测服装的防护性能。更多还原

【Abstract】 The emphasis of study on thermal protective materials and clothing is one of the most important approaches to improve national safety development and promote the textile industry. The current studies on thermal protective clothing mainly focus on flame, radiant heat and contact burn. However, the workers in firefighting, petrochemical, and food processing industry will also encounter the hazards of hot liquid splashes and steam. Weather the traditional thermal protective clothing can provide sufficient protection against hot liquid splashes to ensure the occupational health and safety of workers is a hot topic of public health. The protection provided by protective clothing not only depends on fiber and fabric thermo-physical properties, but also relates to garment structure, design features, garment fit and etc. To achieve the above requirements and objectives, the heat and mass transfer through protective clothing under exposure to hot liquid splashes was investigated, and the skin burn injury was predicted. Firstly, a novel bench scale hot liquid splashes tester was developed to investigate the effects of fabric properties, exposure liquid type and air gap on the thermal protection provided by protective materials used for protective clothing; furthermore, the effects on the impact liquid penetration through protective fabrics were explored; and thus the heat and mass transfer through protective materials was clarified. Secondly, a novel method was proposed to characterize the air layer entrapped in thermal protective clothing, and the air gap size and distribution was analyzed; an advanced instrumented spray manikin test system was established to investigate the thermal protection of full scale protective clothing, the effects of material properties, design features and garment size on heat transfer and skin burn injury were investigated. Finally, the correlation between bench scale test and manikin test was analyzed, and the prediction model of overall protective performance was established. The specific research contents were provided as follows.1)Thermal performance of protective fabrics upon hot liquid splashesIn this study, a new hot liquid tester was developed based on the modification of standard test device described in ASTM F2701.The most important innovations include temperature-controlled circulating reservoir, liquid delivery pipeline, flow control component, skin simulant sensors and skin burn prediction program.Seven typical used protective materials in North American market were selected in this study. The protective performance was evaluated by the newly developed apparatus, and the mechanism associated with heat and mass transfer was clarified. Under exposure to hot liquid splashes, the heat transfer modes consist of convection on the fabric surface, thermal conduction and radiation in the fabric and energy transfer associated with mass transfer. The results indicated that impermeable and semipermeable fabrics provided better performance than permeable fabrics, and the fabric thickness greatly affected the protective performance of impermeable and semipermeable fabrics; for the permeable fabrics, the decrease of liquid penetration, could significantly improve the performance of permeable fabrics. It was demonstrated that the mass transfer was one of the key factors influencing the heat transfer and skin burn injury. The surface property of fabric and dynamic viscosity of liquid affected the liquid penetration. Different liquids caused distinct damage to skin, namely the drilling fluid and distilled water resulted in more severe skin burn injury under the same exposure configuration. Thermal diffusivity of liquid, mass transfer rate and total amount of penetration determined the overall protective performance of a fabric system. The skin burn injury at the position under the liquid jet was more severe than other areas, which might be related to impingement force due to liquid jet and liquid penetration performance.2) Factors affecting liquid impact penetrationBased on the standard AATCC42-2000"Water Resistance:Impact Penetration Test" and the newly developed hot liquid splashes tester, a new approach to evaluate the liquid penetration under exposure to hot liquid splashes was proposed.The effects of fabric properties, liquid temperature, liquid type, impingement angle, and fabric combinations on liquid impact penetration were investigated. The results indicated that the fabric with higher wetting resistance provided lower liquid absorption and penetration. The liquid penetration increased with the liquid temperature. The dynamic viscosity of liquid greatly affected the penetration, furthermore, the challenge liquid with bigger viscosity caused lower penetrated and higher stored amount of liquid. The impingement angle also showed significant effect on the liquid transfer performance, namely the smaller inclined angle resulted in larger penetrated and absorbed amount of liquid. The addition of thermal liner sharply increased the stored amount of liquid, decreased the penetration; moreover, the involvement of moisture barrier caused more liquid stored in the outer shell, but the total stored amount of liquid was significantly lower than that with thermal liner.3) The effect of air gap on heat and mass transfer of protective fabricsThe air gap has important effect on heat and mass transfer of protective clothing. In this study, an air spacer of6mm was made and added between the fabric and the sensor board to investigate the effect of air gap on thermal protective performance against hot liquid splashes. The results showed that the energy transferred to skin depended on the fabric properties, liquid properties and test configurations. Different liquids caused different damage to skin, which was related to the test condition. The air gap sharply decreased the absorbed energy, extended the second degree burn time, and thus improved thermal protective performance. It was confirmed that keeping the air layer between garment and human skin was a very effective approach to provide high performance. The effect of air gap on protective performance depended on the fabric type. The air gap could decrease the liquid penetration and vapor transfer through permeable fabrics, and thus significantly improve the protective performance. However, for the hydrophobic permeable fabrics, vapor could penetrate through the fabric and condense on the sensor with discharging of energy to sensor, and thus sharply eliminated the positive effect of air gap.4) Characterization of air gap in thermal protective clothingTen typical thermal protective clothing for industrial workers was selected, and both the nude and dressed manikin was scanned by Human Solution3D body scanner. The data was processed by a novel developed procedure using Rapidform XOR and XOV software. The local and overall average air gap size and its distribution were analyzed in terms of material properties and garment size.It was indicated that the air gap between garment and human skin depended on the body geometry, fabric properties and garment size. The air gap size in the convex area was higher than that in concave area, and the regions with larger circumstance presented smaller air gap. The garment with bigger fabric weight showed larger air gap size. The flexural rigidity also affected the air gap size, namely the garment with higher rigidity fabric presented worse drapability, and thus the air gap was bigger. The larger garment size showed higher local and overall average air gap size. In addition, the air gap distributed unevenly over the human body; the air gap at leg and abdomen was relatively high, while the air gap at chest, hip and arms was relatively low.5) Protective performance evaluation using instrumented spray manikinA new instrumented spray manikin test system was established based on the flame manikin test system, which was the only apparatus to evaluate the protective performance of protective clothing upon hot liquid splashes. The effects of fabric properties, design features, and garment size on heat and mass transfer and skin burn injury distribution were investigated. The newly developed spray manikin test system was proved to be capable of differentiating the selected protective clothing in terms of absorbed energy and percentage of skin burn. The tested protective clothing was divided into seven categories according to the protective performance. The impermeable and semipermeable garments provided better performance than those of permeable garments. The thickness of fabric and design features showed effects on the performance of impermeable and semipermeable clothing. The effect of fabric weight on heat transfer through protective clothing system seems to be minimal.The water repellency treatment showed great effect on protection.The size of garment showed effects on thermal protection of permeable garments, but these were not significant. The difference between the tight clothing and the loose clothing was significant, but there was no significant difference between the fit garment and the tight or loose garment. Minimizing mass transfer was recognized as the critical factor for protection from hot water. Maintaining a proper air gap between the garment and human body was a critical factor in improving thermal performance. The design features also affected the overall performance. Adding fabric layers could improve thermal protective performance of garments. The reflective tape could provide extra protection and decrease skin burn injury.The skin burn injury distributed unevenly, and mainly occurred at the areas of compression upon water spray (chest and abdomen), heavy water flow (waist, hip and leg) and small air gap.The overall average air gap size showed significant negative correlation with the percentage of skin burn and total absorbed energy. Generally, the air gap distribution and skin burn distribution presented negative relationship. The negative correlation between local average air gap size and skin burn injury was presented. Moreover, the relationship was significant except pelvis (P<0.05). For a specific garment, the air gap at a certain area didn’t correlate well with the average air gap size. The air gap size at upper extremity negatively correlated with the skin burn injury, except the garment G5.6) Prediction of performance of protective clothing upon hot liquid splashesThe correlation between the parameters obtained in bench scale test and manikin test was conducted. The results showed that the second degree burn time significantly linearly correlated with the absorbed energy in bench scale test without air gap, and the percentage of skin burn was also significantly linearly related to the absorbed energy; the indices obtained in bench scale test without air gap were significantly nonlinearly correlated with those measured in manikin test respectively; the correlation was linear when there was a6mm air spacer. In addition, the prediction model of percentage of skin burn was established based on the second degree burn time and average air gap size, namely PBI=97.671-2.597*T2-1.84*AAG. This model indicated that the percentage of skin burn could be predicted if the second degree burn time of the fabric and the average air gap size of the garment were known.更多还原