DBDPE复合阻燃剂对SBS沥青性能的影响

Effect of DBDPE composite flame retardant on the performance of SBS asphalt

为了研究十溴二苯乙烷(DBDPE)复合阻燃剂对SBS改性沥青性能的影响,采用极限氧指数试验、烟密度试验、针入度试验、延度试验、软化点试验、动态剪切流变试验和弯曲梁流变试验等方法,分析不同阻燃剂掺量下SBS改性沥青阻燃抑烟性能、物理性能和流变性能。研究结果表明:DBDPE复合阻燃剂对SBS改性沥青性能具有显著影响,其阻燃抑烟性能显著提高;随着DBDPE复合阻燃剂掺量的增大,SBS改性阻燃沥青极限氧指数逐渐提高,其烟密度等级逐渐降低,当阻燃剂掺量(质量分数,下同)大于8%时,其极限氧指数大于24%且烟密度等级降幅较小,阻燃抑烟性能提升有限,SBS改性阻燃沥青针入度和延度逐渐降低,软化点逐渐提高,当阻燃剂掺量小于12%时其延度大于20 cm,当阻燃剂掺量大于12%时其软化点提高的幅度较小;DBDPE复合阻燃沥青高温抗变形能力显著提高,随着阻燃剂掺量的增大,SBS改性阻燃沥青抗车辙因子、蠕变恢复率逐渐增大,但当阻燃剂掺量大于8%时其提高的幅度较小;DBDPE复合阻燃沥青低温抗裂性能逐渐降低,随着阻燃剂掺量的增大,SBS改性阻燃沥青的低温蠕变劲度模量逐渐提高,低温蠕变速率逐渐降低,但当阻燃剂掺量大于12%时二者变幅较小。综合考虑BDDPE复合阻燃剂对SBS改性沥青阻燃性能、抑烟性能及高低温流变性能的影响可知,当其掺量为8%~12%时的技术性能较好。

To study the effect of DBDPE composite flame retardant on the performance of SBS modified asphalt, the flame retardant and smoke suppression properties, physical properties and rheological properties of SBS modified asphalt with different flame retardant content were analyzed, based on the limit oxygen index test, smoke density test, penetration test, ductility test, softening point test, dynamic shear rheology test and bending beam rheology test. The results show that DBDPE composite flame retardant has a significant effect on the performance of SBS modified asphalt. DBDPE composite flame retardant significantly improves the flame retardant property. With the increase of the content of DBDPE composite flame retardant, limit oxygen index(LOI) of SBS modified flame retardant asphalt increases gradually, but its smoke density grade decreases gradually. When the content of flame retardant is more than 8%, LOI is more than 24%, the smoke density grade decreases less, and the improvement of the flame retardant and smoke suppression properties is limited. With the increase of the content of DBDPE composite flame retardant, the penetration and ductility of SBS modified flame retardant asphalt decrease, but the softening point increases gradually. When the content of flame retardant is less than 12%, the ductility is more than 20 cm, and when the content of flame retardant is more than 12%, the softening point increases less. The high temperature deformation resistance of DBDPE composite flame retardant asphalt is significantly improved. With the increase of the content of DBDPE composite flame retardant, the rutting factor and creep recovery rate of SBS modified flame retardant asphalt increase gradually. When the content of flame retardant is more than 8%, the rutting factor and creep recovery rate increase less. The low temperature crack resistance of DBDPE composite flame retardant asphalt gradually decreases. With the increase of the content of DBDPE composite flame retardant, the creep stiffness modulus of SBS modified flame retardant asphalt increases gradually, and the creep rate decreases gradually. When the content of flame retardant is more than 12%, the creep stiffness modulus and creep rate of it change little. Considering the effects of BDDPE composite flame retardant on the flame retardant performance, smoke suppression performance, high and low temperature rheological properties of SBS modified asphalt, it can be seen that the technical performance is better when the content of DBDPE composite flame retardant is 8% to 12%. 4 tabs, 18 figs, 27 refs.