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用二甲基亚砜、尿素、醋酸钾和氨基硅烷等化合物对高岭土进行改性,用作不饱和聚酯树脂(UPR)的阻燃剂,利用锥形量热法研究了不同改性高岭土对UPR的阻燃抑烟性能,用扫描电镜和热重分析仪研究了UPR燃烧后残炭的微观形貌和阻燃机理.结果表明,改性高岭土能提高UPR的阻燃性能,其中尿素改性高岭土的阻燃抑烟性最好,提高UPR热稳定性的效果最佳,其热释放速率峰值、总生烟量、CO和CO_2产率比纯UPR分别降低了14.9%,59.1%,30.8%和29.6%;其次是氨基硅烷改性高岭土,二甲基亚砜改性高岭土和醋酸钾改性高岭土效果最差.
Kaolinite was modified with dimethylsulfoxide, urea, potassium acetate and aminosilane and used as flame retardant of unsaturated polyester resin (UPR). The effects of different modified kaolin pairs UPR flame retardancy and smoke suppression properties were studied by scanning electron microscopy and thermogravimetric analysis of UPR combustion carbon residue morphology and flame retardant mechanism.The results show that modified kaolin can improve the flame retardant properties of UPR, Kaolin is the best flame retardant and smoke suppressant to improve the thermal stability of UPR. The peak value of heat release rate, the total amount of raw smoke, the CO and CO 2 yields were reduced by 14.9%, 59.1% and 30.8% And 29.6% respectively; followed by aminosilane-modified kaolin, dimethylsulfoxide-modified kaolin and potassium acetate-modified kaolin.