物理化学学报 >> 2010, Vol. 26 >> Issue (09): 2429-2436.doi: 10.3866/PKU.WHXB20100908

催化和表面结构 上一篇    下一篇

海泡石对膨胀阻燃聚丙烯燃烧和热分解的影响

吴娜1,2, 丁超1, 杨荣杰1, 郝建薇1   

  1. 1. 北京理工大学材料学院, 北京100081;
    2. 北京航空材料研究院, 北京 100095
  • 收稿日期:2010-01-18 修回日期:2010-05-20 发布日期:2010-09-02
  • 通讯作者: 杨荣杰 E-mail:yrj@bit.edu.cn
  • 基金资助:

    国家科技支撑计划(2006BAE03B05-2)资助项目

Effect of Sepiolite on the Combustion and Thermal Decomposition of Intumescent Flame Retardant Polypropylene

WU Na1,2, DING Chao1, YANG Rong-Jie1, HAO Jian-Wei1   

  1. 1. School of Material, Beijing Institute of Technology, Beijing 100081, P. R. China;
    2. Beijing Institute of Aeronautical Materials, Beijing 100095, P. R. China
  • Received:2010-01-18 Revised:2010-05-20 Published:2010-09-02
  • Contact: YANG Rong-Jie E-mail:yrj@bit.edu.cn
  • Supported by:

    The project was supported by the National Key Technologies R&DProgramof China (2006BAE03B05-2).

摘要:

将改性后的海泡石添加到聚磷酸铵(APP)和双季戊四醇(DPER)膨胀阻燃聚丙烯(PP/IFR)体系中, 采用氧指数(LOI)、热重分析(TGA)、光电子能谱(XPS)、傅里叶变换红外(FTIR)光谱、锥形量热仪(CONE)和扫描电镜(SEM)考察其对膨胀阻燃体系的催化协效作用, 探讨作用机理. LOI 结果表明, 改性的海泡石比纳米水滑石和有机改性的蒙脱土有更好的催化协效作用. CONE 数据证实, 海泡石可以降低膨胀阻燃聚丙烯体系的热释放速率和总的热释放量. 通过观察SEM 图片发现, 海泡石可以改善膨胀炭层的形貌, 提高炭层的隔热隔质性能. TGA结果表明, 在氮气和空气气氛下, 海泡石均可以提高膨胀炭层的热稳定性, 增加高温时残余物的量, 其主要作用对象为APP. FTIR 和XPS 测试发现加热过程中海泡石可以与APP 发生化学反应, 形成P—O—Si 键, 增加了APP高温时的稳定性.

关键词: 海泡石, 聚丙烯, 膨胀阻燃, 燃烧性能, 热分解

Abstract:

We added modified sepiolite to a polypropylene (PP)/ammoniumpolyphosphate (APP)/di-pentaerythritol (DPER) composite to study the effect of sepiolite on the retarding behavior of the intumescent flame retardant (IFR) PP flame. The flame retarding behavior of the PP/IFR composite was tested using the limiting oxygen index (LOI) and cone calorimeter tests (CONE). The results show that sepiolite increases the LOI value of the PP/IFR and it is more effective than other nano-fillers such as layered double hydroxides (LDH) and organic montmorillonite (OMMT). The sepiolite decreases the heat release rate (HRR) and the total heat release (THR) of the PP/IFR composite. The flame- retardant mechanism of the PP/IFR/sepiolite system is also discussed in terms of catalytic charring after analysis by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). For the binary APP/DPER mixture, sepiolite reduces the mass loss rate and increases the amount of residue at high temperature under nitrogen and air atmospheres. This has been considered to be strongly associated with the interaction between sepiolite and APP. FTIR and XPS results show that the P—O—Si bond forms at high temperature for binary mixtures of APP/sepiolite. With the addition of sepiolite to the PP/IFR, the char residue burnt is dense and homogeneous, which is important for the flame retardant performance.

Key words: Sepiolite, Polypropylene, Intumescent flame retardance, Combustion property, Thermal decomposition

MSC2000: 

  • O643