资源集约型橡胶沥青加工工艺研究

Study on the Processing Technology of Resource Intensive Rubber Asphalt

为了研究剪切时间和剪切温度等生产工艺,以及胶粉用量、化学添加剂等对橡胶沥青性能的影响,分别改变生产工艺和胶粉及添加剂用量,制备橡胶改性沥青,并研究其基本性能指标。主要研究结论如下:随着剪切时间的延长,黏度先增大后减小,针入度逐渐增大,延度先增大然后基本保持不变,软化点基本不变,离析值变小。随着加工温度的升高,针入度明显增大,软化点降低,从而降低了其高温性能。随着胶粉掺量的增加,体系的黏度增大,限制了沥青体系的流动性,同时针入度减小,延度下降。交联剂含量的增加能够减小离析值,提高改性沥青的高温贮存稳定性。活化剂使胶粉与沥青两者的相容性提高,降低了改性沥青的耐感温性能和耐老化性能,但是高温储存稳定性得以改善。综合工艺以及配方设计等研究成果,通过掺加胶粉25%,硫化剂0.5%(占胶粉含量),活化剂0.3%,在180℃,4 000 r/min的剪切乳化机中剪切45 min,可制备高温贮存性能良好的资源集约型橡胶沥青。

In order to study the effect on rubber asphalt performances by dynamic shear time, dynamic shear temperature, the dosage of rubber power and additives, we prepared rubber modifier asphalt processing technology, rubber power and additives, and then we studied their basic performances. in different According to the test results ： as the extension of shear time, viscosity increases after first decreases, penetration gradually increase, ductility increases first and then basically remain unchanged, softening point basically remain un- changed, segregation value getting smaller. With the increase of processing temperature, penetration increases obviously, softening point reduce, which decline the high temperature performance. As the rubber powder content increasing, system viscosity increase, which tion and ductility decreases. The increase of cross - limits the liquidity of asphalt, at the same time penetra- linking agent reduces the value of segregation, improves the high temperature storage stability of modified asphalt. Activator improve the compatibility of rubber powder and asphalt, decline the thermal resistance and aging resistance performance of modified asphalt, but the high temperature storage stability was improved. Integrate research results such as process technology and formula design, it is known that： resource intensive rubber asphalt with good high temperature storage stability can be prepared through adding rubber powder 25 wt %, 0.5% curing agent （ of rubber powder）, activator 0. 3%, and sheared in emulsifying machine 45 min at 180℃, 4 000 r/min.