超临界流体辅助废橡胶螺杆挤出连续再生工艺优化设计

Optimization Design of Continuous Regeneration Process of Waste Rubber Screw Extruded by Supercritical Fluid

通过自主研发的超临界流体辅助螺杆挤出连续再生实验平台,探究不同工艺条件对废旧胶粉再生程度的影响。实验结果表明:喂料螺杆与主螺杆最优的转速比为1∶4;再生过程中交联键断裂后搭接形成亚甲基和碳碳双键;超临界流体环境下制备再生胶的微观形貌具有更高的连续性和一致性;在螺杆转速为50 r/min的条件下,挤出产量达92 kg/h;超临界流体的加入有利于提高再生胶的品质,具有最佳再生效果的工艺条件为:螺杆转速为40 r/min,超临界流体与胶粉质量比为2%,机筒温度在水平3,这为本项目的深入实验及工业化应用奠定了基础。

In this paper, the independent research and development of supercritical fluid assisted regeneration experimental platform were Used to explore the impact of different process conditions on waste tubber powder regeneration degree. Experimental results show that the optimum speed ratio of the feed screw and the main screw is 1：4; during the regeneration process, the Crosslinks are broken to form a methylene and carbon-carbon double bonds; the microstructure of recycled rubber in supercritical fluid environment has higher continuity and consistency; at the screw speed of 50 r/min, the extrusion yield is 92 kg/h; the addition of supercritical fluids is beneficial to improve the quality of reclaimed rubber. The optimum conditions for the regeneration process ： the screw speed is 40 r/rain, the mass ratio of supercritical fluid and rubber powder is 2 %, barrel temperature at level 3. This provides the foundation for in-depth experiments and industrial applications of this project.