共查询到19条相似文献,搜索用时 93 毫秒
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LL阻燃剂的加入对防火涂料性能的影响 总被引:1,自引:0,他引:1
在防火涂料中加入了LL阻燃剂后,通过采用小室燃烧试验法、产烟试验、热分析仪、电子显微镜等实验检测和分析结果为依据,指出使用LL复合阻燃剂是进一步提高防火涂料性能的途径之一.提出LL阻燃剂的加量在15%时,防火涂料既有很好的防火性能,又有优良的理化性能. 相似文献
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膨胀型防火涂料膨胀发泡层质量对涂料防火性能的影响 总被引:3,自引:0,他引:3
介绍了膨胀型防火涂料阻燃防火机理,并对涂料膨胀发泡层的品质进行了研究,对今后研制高效优质的膨胀型防火涂料提供有价值的参考。 相似文献
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可膨胀石墨在膨胀型钢结构防火涂料中的应用研究 总被引:4,自引:1,他引:3
为了克服钢结构防火涂料膨胀发泡层蓬松易脱落和易开裂的缺点,采用可膨胀石墨来改善防火涂料发泡层的结构.研究了可膨胀石墨对发泡层形貌和钢结构耐火极限的影响.结果表明,可膨胀石墨膨胀后成"蠕虫"状穿插于发泡层中,起到增强作用,使炭质层结构更致密.采用膨胀容积为180 mL/g、粒径为0.18 mm、起始膨胀温度为150 ℃的可膨胀石墨时,当添加量为3%时具有较好的改性作用. 相似文献
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阻燃剂在膨胀型防火涂料中的应用 总被引:17,自引:1,他引:16
根据阻燃剂的分类,阐述了各类阻燃剂的阻燃机理。评述了国内外几种阻燃性好的阻燃剂的应用。提出了膨胀型防火涂料中阻燃体系及阻燃剂的选用原则。 相似文献
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超薄膨胀型钢结构防火涂料防腐性能的研究 总被引:5,自引:0,他引:5
介绍了钢材的腐蚀及防腐机理,采用复合改性丙烯酸树脂作为基料,研制出一种既具有高效防火隔热性能,又具有优异的防腐蚀性能的超薄膨胀型钢结构防火涂料。 相似文献
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新型混凝土结构防火涂料的研制 总被引:2,自引:1,他引:1
采用隔热矿物、耐火纤维、无机粘结材料和复合添加剂制成无机单组分混凝土结构防火涂料。该涂料具有耐火极限高、粘结强度大及耐潮湿、干燥快等特性,适用于公路、铁路、城市地铁和隧道等各种混凝土结构表面的防火保护。 相似文献
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The fire protection and thermal stability properties of intumescent fire-retardant coatings filled with three various clay nano-fillers (layer double hydroxide [LDH], montmorillonite [MMT], and sepiolite) were compared by fire protection tests and thermo-gravimetric analysis. The fire protection tests show that the incorporation of three fillers improves the fire protection properties of the intumescent fire-retardant coatings and the addition of 1 wt% sepiolite exhibits the lowest flame spread rating of 9.9 and equilibrium backside temperature of 164.5°C at 900 seconds. TG analysis shows that the incorporation of nano-fillers imparts a considerable enhancement of thermal stability and char formation to the intumescent coatings. Especially, the coating with 1 wt% sepiolite acquires the highest residual weight of 34.2% among the samples. Char residue analysis presents that the introduction of clay nano-fillers plays a positive role in enhancing the compactness and anti-oxidation ability of the char residues, and this positive effect as well as the flame-retardant efficiency depends on the types of clay nano-fillers. The three types of layered clay nano-fillers exhibit synergistic flame-retardant effectiveness in the order of sepiolite > MMT > LDH. 相似文献
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采用多羟基、多羧基的活性天然产物茶皂素为原料,与聚磷酸铵和季戊四醇在一定条件下反应,制备一种聚磷酸酯类茶皂素基三位一体新型环保膨胀型阻燃剂。采用傅里叶红外分析技术对阻燃剂进行了结构表征,采用综合热分析仪对阻燃剂的热降解性能进行了研究。结果表明,茶皂素与聚磷酸铵、季戊四醇发生反应,生成聚磷酸酯类茶皂素基膨胀型阻燃剂,且该阻燃剂具有良好的热稳定性,降解热释放较小,高温残留率高,最终的质量残留率高达30.77%。将制备阻燃剂用于阻燃涂料中,并采用氧指数测试仪和锥形量热仪研究了阻燃涂料的阻燃性能和热解性能。研究表明,茶皂素基三位一体膨胀型阻燃剂能显著提高涂料的阻燃性能,阻燃涂料的氧指数值高达34.2%,耐火时间为11.1 min,且锥形量热实验中,该阻燃涂料试样的平均热释放速率(m-HRR)为36.18 kW/m2,总热释放量(THR)为5.25 kJ/m2,平均有效燃烧热(m-EHC)为5.11 kJ/kg,与含复合型阻燃剂的阻燃涂料试样相比,阻燃性能得到极大提高。该制备阻燃剂不含卤素,集三源一体,具有阻燃性能优越,相容性能良好,高效环保等优点。 相似文献
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Traditional intumescent coatings are widely used as passive fire-protective coatings for steel structures as they are capable of expanding in the range of 20–50 times the original thickness thereby providing excellent insulation. However, the fragile nature of such residue and susceptibility to thermo-oxidation given their carbonaceous nature are key problematic issues. The concept of in situ ceramization is explored in this work as a means to form inorganic cohesive char with improved rigidity and thermo-oxidative stability. Coating samples were prepared by incorporating ammonium polyphosphate, talc, Mg(OH)2, and polydimethylsiloxane as additives into acrylic resin at different weight fractions. Thermal analysis and x-ray diffraction have confirmed the reactions between the additives to form various crystalline magnesium phosphate phases, and to a small extent, silicon phosphate, thereby ensuring the thermo-oxidative stability of the residue. This is reiterated by the fire performance tests (by exposing the coatings to a temperature profile in a furnace similar to ISO 834 fire curve). Despite the advantages of rigid char and its thermo-oxidative stability as a result of formation of inorganic phosphates, the lack of swelling has resulted in relatively poor insulation capabilities of the char, and subsequently, compromised the fire protection times (that are in the range of 45–55 min). However, pyrolysis flow combustion calorimeter results of the coatings are promising and have shown a significant drop of up to 70% in the peak of heat release rate values as compared to neat resin. 相似文献