阻燃剂表面改性对阻燃沥青性能的影响

为提高阻燃剂与沥青的相容性,对阻燃剂进行表面改性并用于制备阻燃沥青.通过沥青氧指数试验、软化点试验、动态剪切流变试验、延度试验和离析试验评价阻燃剂对沥青阻燃性能、高、低温性能及储存稳定性的影响并确定最佳掺量.借助热重(TG)和扫描电镜(SEM)分析阻燃剂的表面改性机理和阻燃机理.结果表明,阻燃剂可以显著提高沥青的阻燃性能和高温性能,当掺量不超过8%,对沥青的低温性能和储存稳定性影响较小;阻燃剂可以促进沥青成炭,减少沥青燃烧时气体挥发物的逸出;表面改性会提高阻燃剂的分散性和阻燃沥青的热稳定性,改善阻燃沥青的阻燃性能和低温性能.

Influence of Surface Modification of Flame Retardant on Performance of Flame Retardant Asphalt

In order to improve the compatibility of flame retardant and asphalt, flame retardant was surface modified and then used to prepare flame retardant asphalt.The limiting oxygen index, softening point,dynamic shear rheometer(DSR),ductility,and standard test method for separation were carried out to study the flame-retardancy property,high temperature haracteristics,low temperature performance and storage stability of flame retardant asphalt and the adding amount of flame retardant was determined. TG test and scanning electron microscopy were applied to analyze the surface modification mechanism of flame retardant and fame-retardant mechanism of flame retardant asphalt.The test results show that flame-retardancy property and high temperature performance of asphalt with flame retardant could be significantly improved,which has little influence on the low temperature performance and storage stability of flame retardant asphalt when the content of flame retardant is not more than 8%.Flame retardant is useful for promoting carbonization of asphalt and the gas volatiles when burning are reduced.Surface modification increases the dispersibility of flame retardant and thermal stability of flame retardant asphalt and the flame-retardancy property and low temperature performance of flame retardant asphalt are improved.