共查询到18条相似文献,搜索用时 203 毫秒
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针对煤矿巷道沥青路面火灾的危害,论述了巷道沥青阻燃的必要性,介绍了常见的阻燃剂类型和路用性能,分析了阻燃剂的阻燃机理和沥青混合料阻燃性能的测试方法,并结合大量试验和研究,指出阻燃剂的掺入可以达到推迟燃烧,阻止燃烧的目的。 相似文献
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通过添加阻燃剂,评价阻燃沥青及其混合料的性能,分别采用氧指数法和直观燃烧法评价阻燃剂的阻燃效果。结果表明加入阻燃剂后,沥青及其混合料的高温性能有所提高,低温性能略微下降;在阻燃效果方面,阻燃沥青混合料的氧指数比普通沥青混合料提高30%,燃烧时间缩短38%,具有明显的阻燃效果。 相似文献
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根据《沥青混合料试验规程》的有关试验方法,对不同细集料组成的沥青混合料的水稳定性、抗滑性、温度稳定性等路用性能的影响进行了系统试验研究,试验结果表明,细集料对沥青混合料的路用性能具有显著的影响。 相似文献
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研究不同成型方法对SAC沥青混合料的路用性能影响。采用标准马歇尔击实方法、旋转压实100次和旋转压实125次成型SAC沥青混合料试件,评价不同成型方法设计的同种级配的沥青混合料高温稳定性,水稳定性和疲劳性。试验结果表明,标准马歇尔成型设计的SAC沥青混合料高温性能最差,采用旋转压实100次设计的高温性能最好,采用旋转压实125次设计的沥青混合料并没有对SAC沥青混合料的高温稳定性提高有明显作用。按标准马歇尔成型方法设计的SAC沥青混合料水稳定性最好,而按SGC旋转压实125次设计的水稳定性最差。按旋转压实100次设计的SAC沥青混合料的抗疲劳性能最好,采用标准马歇尔击实设计的SAC沥青混合料的抗疲劳性能最差。对于骨架密实型的SAC沥青混合料采用SGC旋转压实100次成型设计,会得到较好的综合路用性能。 相似文献
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利用生物基阻燃剂植酸三聚氰胺盐 (MPA) 阻燃改性环氧树脂并对其性能进行研究。通过红外光谱 (FTIR) 以及X射线光电子能谱
(XPS) 对MPA化学结构进行表征。利用热重分析仪 (TGA)、极限氧指数测试仪 (LOI)、垂直燃烧测试仪 (UL-94) 及锥形量热测试仪 (CC) 研究阻燃环氧树脂的热稳定性及阻燃性能。热重分析结果表明,MPA阻燃剂在800 ℃残炭达到25.6%,引入环氧树脂后可提升材料高温区热稳定性。垂直燃烧测试显示MPA在15%添加量下可赋予环氧树脂UL-94 V-0等级,表明MPA对环氧树脂有较好的阻燃效果。进一步锥形量热结果表明,MPA的加入显著降低了环氧树脂的热释放速率及总热释放,同时表现出优异的抑烟性能。 相似文献
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为了提高硬质聚氨酯的阻燃性能,采用磷改性聚醚,并添加三聚氰胺(Melamine)和聚磷酸胺(APP),并对试件的燃烧行为和热性能进行了研究。结果表明:在含磷硬质聚氨酯保温隔热材料中等比例添加Melamine和APP,能形成氮-磷协同阻燃体系,材料的阻燃性能得到显著提高,其中氧指数达34.43%,水平燃烧等级达到FH-1,垂直燃烧等达FV-0。 相似文献
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Sunil K. Sharma 《Fire Technology》2003,39(3):247-260
Metal-based organic complexes (MBO) are a class of FRSS additives that comprise a transition metal and an organic ligand that cleaves at an elevated temperature thereby releasing the metal in a reactive state. They help in the formation of char and thus act as an effective smoke suppressant. Use of MBO complexes as flame retardant smoke suppressants, phosphate ester as a flame retardant and active filler as endothermic material is reported here as multicomponent FRSS systems. MBOs used in the present study are the chelates of pentanediono. They were used alone as well as in combination with aluminum trihydrate (ATH) as filler were used to impart flame retardancy and smoke suppression to poly vinylchloride. Their performance was measured in terms of flammability, smoke generation, char formation and evolution of combustion gases. MBOs of molybdenum and chromium were found to be very efficient flame retardant smoke suppressants. 相似文献
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以聚磷酸铵(APP)和三氧化钼(MoO3)为阻燃剂,采用一步发泡法制备阻燃聚氨酯软质泡沫(FPUF),通过扫描电镜、氧指数仪、热重分析仪和锥形量热仪等测试手段研究了MoO3和APP对聚氨酯软泡的泡孔结构、热稳定性、阻燃性能以及产烟量的影响规律。研究表明:MoO3和APP均能提高聚氨酯软泡的阻燃性能,与纯聚氨酯软泡相比,当APP和MoO3的添加量均为7.5%时,阻燃聚氨酯软泡的总热释放量和总产烟量分别降低了44.2%、66.3%,表现出很好的阻燃和抑烟性能;探讨了APP和MoO3阻燃聚氨酯软泡的阻燃作用机理,APP在气相和凝聚相发挥阻燃作用,在气相中通过生成含磷官能团捕获气相中的自由基,在凝聚相中发挥催化成炭的作用,MoO3能促进热裂解聚氨酯催化成炭,提高成炭率,使炭层致密,并提高聚氨酯软泡的热稳定性,有效提高聚氨酯软泡的火灾安全性。 相似文献
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《Construction and Building Materials》2010,24(12):2554-2558
Effects of aging on the properties of asphalt binders modified by incorporating Styrene–Butadiene–Styrene (SBS) and flame retardants (FR) were studied. Asphalt binders were artificially aged in the rolling thin film oven (RTFOT) and Pressure Aging Vessel (PAV). The flame retardancy of modified asphalt binders were characterized using limited oxygen index (LOI), and the effects of aging on the properties of asphalt binders were studied using Brookfield viscometer test and dynamic shear rheometer test. Experimental results indicated that the flame retardancy of asphalt binder was increased after aging. But the increasing amount of LOI is low when the modified asphalt binder containing more flame retardants. The variation of the LOI, softening point, penetration, ductility and viscosity of asphalt binder decreased with flame retardant content increasing, meaning the flame retardants can improve the thermo-oxidative aging resistance of asphalt binder. Furthermore, the G*/sin δ, stiffness and m-value of flame retardant modified asphalt binders display smaller changes after two different aging. 相似文献
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The flame retardancy of asphalt binder was improved by adding flame retardants in previous research. The research was conducted to assess the performance of two kinds of flame resistant asphalt mixture compared with the control mixture in laboratory. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were employed to investigate the effect of aluminium hydroxide (ATH) on the thermal properties of asphalt binder. The mixture was designed using Superpave (Superior Performing Pavement) methods and related pavement performance was evaluated. The wheel-tracking was employed to research the dynamic plastic deformation performance. Experimental results illustrated that two kinds of flame resistant asphalt binders have better flame retardancy and all the pavement performances of two kinds of modified asphalt mixture can meet the Superpave design requirements. Therefore, it was feasible to prepare asphalt mixture with the excellent flame retardancy and pavement performance using ATH modified asphalt binders. 相似文献
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针对建筑保温材料所使用的硬质聚氨酯泡沫易燃的问题,对硬质聚氨酯泡沫进行化学接枝改性,使三聚氰胺基团均匀分散在阻燃材料体系中,通过对材料进行阻燃性能测试、力学性能测试、燃烧性能测试和扫描电镜分析,考察其在氢氧化镁/聚磷酸铵体系中的阻燃性能、压缩性能和抑烟性能。实验结果表明:三聚氰胺结构改性在对材料的压缩性能削弱较小的情况下可以大大提高纯聚氨酯材料的阻燃性能,不添加任何阻燃剂极限氧指数便可达26.4%,在氢氧化镁和聚磷酸铵协同阻燃体系中,极限氧指数可达28.4%,同时达到UL-94的V0等级。改性复合材料热释放速率最小可达到101.9 kW/m2,相较纯聚氨酯材料最大可下降35.3%,燃烧时产生的烟气释放速率相较纯聚氨酯最大可下降56.6%,并且形成致密的炭层,具有十分良好的阻燃效果。 相似文献