| 摘要: |
| 采用层状无卤高效抑烟剂ZnMgAl CO3 LDHs制备阻燃沥青,通过热重差热分析仪、锥形量热仪和X射线光电子能谱仪研究了层状双氢氧化物（LDHs）对沥青阻燃抑烟性能的影响,并分析其阻燃机理.结果表明：掺加质量分数为2%的LDHs可使沥青燃烧的最大热释放速率、平均热释放速率和总烟释放量分别下降249%,143%和270%;LDHs在2%掺量下即有较好的阻燃抑烟效果,而在25%掺量下的阻燃抑烟效果提升有限;LDHs的层状结构可以在沥青燃烧初期降低沥青的失重速率,并提升残渣的完整性、致密性和抗氧化性,但LDHs的热解吸热效应并未在沥青燃烧过程中发挥明显作用. |
| 关键词: 沥青 层状双氢氧化物 阻燃 锥形量热仪 阻隔层 |
| DOI：103969/j.issn.1007 9629201904014 |
| 分类号: |
| 基金项目:浙江省自然科学基金资助项目（LQ17E080011,Y19E080089）;浙江省重点研发项目（2018C03029）;国家自然科学基金资助项目（51808521） |
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| Mechanism of Flame and Smoke Retardancy of Asphalt with ZnMgAl CO3 LDHs |
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ZHU Kai1, TANG Daquan1, HUANG Yadong2, WANG Qiang1, WU Ke3
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1.School of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China;2.Zhejiang General Fire and Rescue Brigade, Hangzhou 310014, China;3.School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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| Abstract: |
| Flame retardant asphalt was prepared in the form of ZnMgAl CO3 LDHs. The thermogravimetry differential scanning calorimetry, cone calorimeter and X ray photoelectron spectroscopy were used to investigate the effects of layered double hydroxides(LDHs) on the flame retardancy and smoke suppression performance of asphalt. The flame retardant mechanism of LDHs was further analyzed. The results show that 2% LDHs can reduce the maximum heat release rate, average heat release rate and total smoke release of asphalt combustion by 249%, 143% and 270% respectively. It shows better effects on flame retardant and smoke suppression with 2% LDHs, while limited effects on performance boost with 25% LDHs. The layered structure of LDHs can reduce the weight loss rate of asphalt in the initial stage of asphalt combustion and improve the integrity, compactness and oxidation resistance of combustion residues, but the thermal desorption mechanism of LDHs does not play a significant role in the process of asphalt combustion. |
| Key words: asphalt layered double hydroxides(LDHs) flame retardant cone calorimeter barrier layer |
