超声波振幅对轮胎胶粉超声脱硫工艺及性能的影响

Effect of ultrasonic amplitude on ultrasonic desulfurization process and performance of ground tire rubber

以40目废旧轮胎胶粉为原料,采用超声脱硫工艺,使用超声同向旋转双螺杆挤出机制备了脱硫废旧轮胎胶粉(DGTR),研究了超声波振幅对脱硫工艺过程中口型压力和功率消耗,DGTR的外观形貌、流变性能和硫化特性,以及DGTR硫化胶力学性能的影响。结果表明,随着超声波振幅的增加,DGTR的凝胶含量、黏度及储能模量逐渐降低,损耗因子逐渐增大;当超声波振幅为13μm时,超声DGTR中交联键断裂数量最多,由此表明此时DGTR的脱硫程度最高。此外,随着超声波振幅的增加,DGTR硫化胶的拉伸强度逐渐降低,扯断伸长率逐渐增加。

The desulfurized ground tire rubber(DGTR)was prepared from 40 mesh waste ground tire rubber by ultrasonic desulfurization process in an ultrasonic co-rotating twin-screw extruder.The effects of ultrasonic amplitude on the die pressure and power consumption during ultrasonic desulfurization process,the external morphology,rheological properties and curing characteristics of DGTR,and the mechanical properties of the re-vulcanized DGTR were studied.The results showed that with the increase in ultrasonic amplitude,the gel content,viscosity and storage modulus of the DGTR decreased gradually and loss factor increased gradually.When the ultrasonic amplitude was set as 13μm,the number of the broken cross-linked bonds of DGTR was the largest during ultrasonic desulfurization process,which meant that the desulfurization degree of DGTR was the highest.Moreover,the tensile strength of the re-vulcanized DGTR decreased gradually and elongation at break increased gradually with the increasing ultrasonic amplitude.