共查询到19条相似文献,搜索用时 578 毫秒
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在总结分析膨胀型防火涂料隔热性能评价方法的基础上,提出了分段等效热阻的概念,即用热阻值的大小综合反应涂料的导热系数和膨胀厚度的变化,根据膨胀型防火涂料的反应特点,将涂料的热阻分为膨胀前和膨胀后两个阶段分别进行计算,并提出了计算分段等效热阻的方法。对2种型号的膨胀型防火涂料进行了标准条件实验,用分段等效热阻模拟的试件温升与实验结果相一致。分段等效热阻可以作为不同型号防火涂料隔热性能的评价依据,为更准确地进行钢构件的防火设计提供数据参考,并可以辅助分析防火涂料的防火机理。 相似文献
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《中国涂料》2017,(2)
研究了成膜物对膨胀型防火涂料的生烟性能影响,包括丙烯酸树脂及溶剂型膨胀型防火涂料、丙烯酸乳液及水性膨胀型防火涂料,结合热分析数据和静态生烟数据,将膨胀型防火涂料的DTG曲线进行分峰拟合,推算出分解的成膜物的分解程度及对膨胀型防火涂料的影响。推算出燃烧过程中丙烯酸树脂的分解比例为21.13%,占膨胀型防火涂料的总分解质量的6.67%。已分解丙烯酸树脂对膨胀型防火涂料的总生烟量贡献为34.64%。以同样的方法,分析水性膨胀型防火涂料,丙烯酸乳液分解了17.5%,占水性超薄型防火涂料的总分解质量的3.51%,已分解丙烯酸乳液的生烟量占膨胀型防火涂料总生烟量的13.81%。根据实验数据,溶剂型体系与水性体系的防火涂料在生烟过程和分解过程均有较大区别。 相似文献
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A novel intumescent coating technology for metallic surfaces was developed using functionalized clays, which were intercalated and exfoliated into nanodimensions. The nanoclays were formulated in epoxy resins and blended with appropriate additives to design intumescent coatings for metallic surfaces. With the high dispersion of nanoclay the flame retardancy is improved. The extent and the homogeneity of the exfoliation and dispersion of the clay particles were assessed employing small-amplitude oscillatory shear. The performance and properties of the coatings were evaluated by means of fire resistance testing, thermo-gravimetric analysis and mechanical properties. The incorporation of the nanoclays significantly increased the elasticity and the viscosity of the intumescent formulations and improved the fire resistance of the epoxy coatings. It is observed that significant gains in flame retarding properties could be achieved when the clay platelets could be adequately exfoliated and dispersed. 相似文献
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Joanna Mastalska-Popławska Kornelia Kadac Piotr Izak Marcin Gierej Agata Stempkowska Zuzanna Góral 《应用聚合物科学杂志》2021,138(9):49914
The article presents results of the research on the influence of graphite/kaolin and graphite/titanium oxide systems on thermal properties, intumescence degree and the integrity of the structure of intumescent protective films based on epoxy resins for steel. The TG/DTG/DSC analysis showed that graphite/kaolin system shifted the decomposition reaction of epoxy resin towards higher temperatures, even by about 30°C. Fire endurance tests and the SEM analysis confirmed these results because more thermally resistant (T500°C reached after 37.5 min for 1.1 coating thickness), swollen (about 20 times) and homogeneous coatings were obtained. The presented results suggest that ceramic fire retardants can successfully cooperate with organic components in intumescent protective coatings for steel elements. 相似文献
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以环氧乳液为基料,聚磷酸铵、三聚氰胺、季戊四醇(APP/MEL/PER)为防火助剂研制了超薄膨胀型钢结构防火涂料。通过调整环氧乳液/固化剂比例,研究了固化剂用量对涂料防火、防腐性能的影响。通过交联度测试进一步讨论了环氧乳液与固化剂比例对涂料性能的影响。结果表明:固化剂占环氧乳液含量20%时,涂层的防火性能和防腐性能均较好。 相似文献
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钢结构用超薄型水性环氧防火防腐涂料的研制 总被引:2,自引:0,他引:2
以液体环氧树脂为基料树脂,以水性胺为固化剂;以聚磷酸铵、三聚氰胺、季戊四醇、氯化石蜡为膨胀阻燃体系;以纳米TiO2、可膨胀石墨为增效剂;以复合铁钛粉为防锈颜料,制备了钢结构用超薄型防火防腐涂料。当环氧涂层的交联度达到理论交联度的50%~70%时,涂层既有优良的防火隔热性能,又有优良的防腐蚀性及机械性能。 相似文献
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