两种新型无机复合阻燃改性沥青的流变性能及其阻燃机制

针对目前沥青阻燃剂存在的毒性大、造价高及耐热性差等问题,制备了两种由金属氧化物和金属氢氧化物组成的新型无机复合阻燃剂.通过动态剪切流变试验、弯曲梁流变(BBR)试验和Brookfield旋转黏度试验,深入研究了两种新型阻燃改性沥青的高温流变性能、低温流变性能以及黏度特性.在此基础上,借助DSC试验探究了两种复合阻燃改性沥青的阻燃机制,并对比了两种无机复合阻燃剂与常用阻燃剂的经济效益.试验结果表明:两种无机复合阻燃剂阻燃的抑烟效果良好,可显著改善沥青的高温抗车辙性能,提高沥青胶浆的低温性能,增加沥青黏度;两种无机复合阻燃改性沥青的抗车辙因子与温度呈现良好的相关性; 将两种复合阻燃剂加入到沥青中,能使沥青相态变化需要更多能量,改性沥青在受热过程中更加稳定.

Rheological properties and retardant mechanisms of two types of new inorganic composite flame retardant modified asphalts

In order to solve the main problems about high toxicity, expensive cost and poor thermostability of asphalt flame retardants currently, two types of new inorganic composite flame retardants consist of metallic oxide and metal hydroxide were prepared. The high temperature rheological properties, low temperature rheological properties and the viscosity characteristics of the two types of new flame retardant modified asphalts were studied deeply through dynamic shear rheological test, bending beam rheological (BBR) test and Brookfield rotational viscosity test. On this basis, the flame retardant mechanisms of the two types of flame retardant modified asphalts were studied using DSC, and the economic benefits of the two types of flame retardants were compared with the flame retardants in common use. Results show that the effect of restraint smoke of the two types of inorganic composite flame retardants is good, the high temperature rut resistance and the viscosity of the asphalts can be improved, and the low temperature performance of asphalt mastic can be strengthened significantly by the two types of flame retardants. The rut resistance factor of the two types of flame retardants shows good correlation with temperature. The incorporation of the two types of flame retardant makes the asphalts require more energy in phase changing, and modified asphalts are more stable in heating process at high temperature.