共查询到19条相似文献,搜索用时 972 毫秒
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本文着重探讨了现行用于建筑外墙保温材料的种类和性能,包括无机保温材料、有机保温材料、无机有机复合保温材料的现有具体产品的性能用途,介绍了各种保温材料现行采用的国家标准或行业标准,以及根据几个重要参数如何选择保温材料。 相似文献
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基于聚苯乙烯泡沫塑料保温材料的应用和研究,综述了保温材料的研究现状,从影响保温材料保温性能的三大因素——耐火性能、导热率、吸水率进行具体分析;然后基于聚苯乙烯泡沫塑料保温材料的研究现状,概述了聚苯乙烯泡沫塑料的优势,并分析了其耐火性能和保温性能,发现聚苯乙烯泡沫塑料在保温方面效果显著;聚苯乙烯泡沫塑料保温材料可以应用于外墙外保温构造、内墙内保温构造、屋面工程保温构造。 相似文献
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针对传统保温材料存在的导热系数高、防火性能弱、强度不足等问题,提出采用性能优异的气凝胶材料来制备复合保温材料。对比了中央空调用各种保温材料的性能,分析了气凝胶材料的应用优势。将气凝胶材料应用到空调管道的保温领域中,以不同质量分数的气凝胶材料制备气凝胶岩棉复合保温材料,确定了复合保温材料的最佳生产工艺和配比,研究了气凝胶含量、岩棉板厚度和密度参数对复合保温材料导热系数和抗压强度的影响。结果表明:添加7%的气凝胶、以40 mm厚度和120 kg/m3密度的岩棉板制备的复合保温材料保温性能最佳;添加一定量的SiO2气凝胶,有助于提高复合保温材料的抗压强度。 相似文献
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涂敷保温材料具有快速固化、负温施工等特殊性能。文章综述了涂敷保温材料的发展趋势,阐述了涂敷保温材料面临的问题,指出解决目前传统涂敷保温材料的热缺陷是进一步发展涂敷保温材料首要克服的困难。 相似文献
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《中国石油和化工标准与质量》2013,(16):42-43
向油井注入高干度的蒸汽是提高油汽比的关键点。本文通过保温管线传热机理的研究;计算保温材料每千米热损失、蒸汽干度降低值;通过钛陶瓷保温材料和硅酸铝岩棉保温材料的保温性能、防水性能、机械性能、使用寿命的比较,可以看出钛陶瓷保温材料以上四方面性能均优于硅酸铝保温材料,是注汽管线保温材料的升级换代产品。 相似文献
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随着埋地管道大量的使用3PE防腐层后,其缺陷也开始逐步地暴露出来,主要表现为3PE防腐层与管道体的剥离、焊缝区3PE防腐层受力裂开等现象。本文就造成理地管道3PE防腐层剥离现象提出了一些防护措施。 相似文献
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Crosslinked polyethylene (XLPE) is progressively replacing other types of polyethylene in electric cable insulation because of its combination of better mechanical and thermal performance and good dielectric properties. Besides its influence on the mechanical and thermal properties, the morphology plays a very important role in the electrical behavior of XLPE. The morphology has been studied in terms of the crystallinity and crosslinking density. These two apparently independent parameters govern the morphology of XLPE and have been investigated in connection with the systematic variation of the processing parameters (crosslinker concentration, cure time, and temperature). The materials have been characterized in terms of the extent of crosslinking (the gel content), the crosslinking density (the average molecular weight between crosslinks), and the crystallinity. A morphological model is proposed for these materials in terms of the mechanisms and rates of the processes involved. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 222–230, 2004 相似文献
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Crosslinked polyethylene foam is widely used in packaging and as an insulation material. Finely ground waste of such crosslinked foam mesh size 7 or particle size less than 2815 μm is used as a filler in high‐density polyethylene (HDPE) of two different grades (7.5 and 21 MFI). Mechanical, thermal, and morphological properties of filled composites is studied experimentally. Waste foam powder concentration was varied up to 40% by weight basis. Impact strength of base HDPE increased by a factor of six. The overall changes in mechanical properties are similar to the crosslinking effect. It is believed that waste foam particles act as a point of entanglement with different chains of polyethylene. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 110–114, 2004 相似文献
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采用中空玻璃微珠(GB)、纳米TiO2单独或复合填充聚乙烯(PE),研究了GB、纳米TiO2含量对复合材料光反射性能和隔热性能的影响。结果表明:GB、纳米TiO2的加入明显提高了PE的反射性能和隔热性能;当GB/PE、TiO2/PE复合材料的比例分别为2/7、1/7时,两种复合材料综合隔热性能达到最佳值,与纯PE相比,辐照5 min后阻隔密室的升温幅度分别下降了16.8℃和16℃,GB与纳米TiO2具有协同隔热作用,GB/PE、TiO2/PE、TiO2/GB/PE 3种复合材料中,GB/TiO2/PE(2/1/7)体系的隔热性能最好,辐照5 min后阻隔密室的升温幅度只有6.8℃比,纯PE下降了22.4℃。 相似文献
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This work examines the correlation between the 1H‐NMR T2 relaxation constant and the mechanical properties of aged crosslinked polyolefin cable insulation. T2 experiments on unswollen samples could not differentiate between unaged and highly aged materials; all exhibited 1H T2 constants of approximately 0.5 ms. To accentuate the effects of aging, samples were swollen in various solvents. Unaged samples had T2 values of approximately 15 ms in good solvents. With thermal aging, T2 values decreased as the ultimate tensile elongation decreased. However, the correlation between T2 and elongation differed for samples irradiated with high‐energy radiation and for materials aged above versus below the crystalline melting temperature. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2578–2582, 2003 相似文献
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真空玻璃作为新一代节能环保玻璃,不仅具有安全和高强度的特征,而且还具有隔热、隔声等优越性能。通过建立复合钢化真空玻璃的声波传递模型,采用波传递法(WTM)理论推导了其隔声量计算公式,并理论分析了不同因素影响下的复合钢化真空玻璃隔声量。研究结果表明,复合真空玻璃的隔声性能显著优于单片玻璃,且玻璃厚度越大,隔声量越高。钢化真空玻璃真空层支撑物数量越少,玻璃隔声量越高。真空层厚度在高中低频时的隔声量不同,真空层厚度约为0.25 mm时,钢化真空玻璃隔声性能相对最佳。该研究对其它类似结构隔声性能的分析及建筑隔声结构的选择具有重要的指导意义。 相似文献
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高温下保温隔热涂层的保温隔热性能是有限的,特别在超过800℃的高温,要延长隔热涂层的有效保温隔热性能更为困难。本文通过高温隔热涂料+聚氨酯泡沫塑料的复合隔热涂层,提高耐高温隔热涂层的保温隔热性能,延长了保温隔热涂层的有效隔热时间。 相似文献