超细全硫化粉末丁苯橡胶改性沥青的性能研究

采用低温高剪切原位改性工艺制备超细全硫化粉末丁苯橡胶（UFPSBR）改性沥青，研究UFPSBR改性沥青的基本性能和热储存稳定性。结果表明：随着UFPSBR用量的增大，UFPSBR改性沥青的25 ℃针入度减小，软化点升高；加入相容剂后，UFPSBR改性沥青的当量软化点(T₈₀₀)提高，当量脆点(T_1.2)降低；不加相容剂的UFPSBR改性沥青中UFPSBR发生团聚现象，加入相容剂后，UFPSBR和沥青的相容性增强，形成了相对稳定的相界面；相容剂能显著提高UFPSBR改性沥青的热储存稳定性。;The basic performance and hot storage stability of asphalt modified with ultra-fine full-vulcanized SBR powder (UFPSBR) were investigated, in which UFPSBR was prepared by in-situ process at low temperature and high shear.The results showed that,with the addition level of UFPSBR increasing,the penetration at 25 ℃ of asphalt decreased,and the softening point increased.By adding compatibilizer,the equivalent softening point(T₈₀₀) of asphalt increased,and the equivalent breaking point (T_1.2) decreased.Without compatibilizer,UFPSBR in asphalt agglomerated.By adding compatibilizer,the compatibility between asphalt and UFPSBR enhanced,and relatively stable phase boundaries were formed.The compatibilizer could greatly enhance the hot storage stability of asphalts modified with UFPSBR