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首页> 外文期刊>Journal of Hazardous Materials >Hierarchically porous SiO_2/polyurethane foam composites towards excellent thermal insulating, flame-retardant and smoke-suppressant performances
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Hierarchically porous SiO_2/polyurethane foam composites towards excellent thermal insulating, flame-retardant and smoke-suppressant performances

机译：多层多孔SiO_2 /聚氨酯泡沫复合材料，具有出色的隔热，阻燃和抑烟性能

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摘要

Polyurethane foam (PUF) is widely used in building insulation field but highly flammable. In an effort to develop an efficient way to reduce flammability and smoke release of PUF without sacrificing its inherent merits, a novel strategy has been proposed to decorate silica aerogels onto the surface of PUF to fabricate hierarchically porous SiO2/PUF composites. Due to the unique hierarchically porous structure, the resultant composites showed superior thermal insulation with a lower thermal conductivity of 0.0282 W/(m K). The introduction of silica aerogels also effectively improved the compressive strength, almost 220% of that of neat PUF. Notably, the SiO2/PUF composites were rendered self-extinguishing in vertical burning tests and had a high limiting oxygen index (WI) value of 32.5%. Cone calorimetry (CC) tests revealed that the peak heat release rate (PHRR) and peak smoke production release (PSPR) of theSiO(2)/PUF composites were reduced by 40.4% and 45.6%, respectively. Particularly, the specific optical density (Ds) of the composites displayed as 55.7% reduction in the smoke density chamber tests, showing excellent smoke-suppression. The mechanism analysis suggested that a compact silica-rich hybrid barrier formed, preventing thermal degradation products and energy transfer during combustion. These results indicate SiO2/PUF composites have enormous potential as building insulation materials.
机译：聚氨酯泡沫（PUF）广泛用于建筑保温领域，但高度易燃。为了努力开发一种有效的方式来降低PUF的易燃性和烟雾释放而又不牺牲其固有优点，人们提出了一种新颖的策略来将二氧化硅气凝胶装饰到PUF的表面上，从而制造出多层多孔的SiO2 / PUF复合材料。由于独特的分层多孔结构，所得复合材料显示出优异的隔热性，而导热率较低，为0.0282 W /（m K）。二氧化硅气凝胶的引入也有效地提高了压缩强度，几乎是纯PUF的压缩强度的220％。值得注意的是，SiO2 / PUF复合材料在垂直燃烧测试中具有自熄性，并具有32.5％的高极限氧指数（WI）值。锥量热法（CC）测试表明，SiO（2）/ PUF复合材料的峰值热释放速率（PHRR）和峰值烟雾释放（PSPR）分别降低了40.4％和45.6％。特别地，复合材料的比光密度（Ds）在烟密度室试验中显示降低了55.7％，显示出优异的烟抑制性。机理分析表明，形成了致密的富含二氧化硅的混合屏障，可防止燃烧过程中的热降解产物和能量转移。这些结果表明SiO2 / PUF复合材料作为建筑隔热材料具有巨大的潜力。

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  • 来源
    《Journal of Hazardous Materials》 |2019年第5期|61-69|共9页
  • 作者

    Li Meng-En; Wang Shui-Xiu; Han Lin-Xuan; Yuan Wen-Jie; Cheng Jin-Bo; Zhang Ai-Ning; Zhao Hai-Bo; Wang Yu-Zhong;

  • 作者单位

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

    Sichuan Univ, Collaborat Innovat Ctr Ecofriendly & Fire Safety, Natl Engn Lab Ecofriendly Polymer Mat Sichuan, Coll Chem,State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Polyurethane foam; Flame-retardancy; Smoke-suppression; Thermal insulation; Hierarchically porous structure;

    机译：聚氨酯泡沫;阻燃;抑烟;隔热;分层多孔结构;

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