废旧聚氨酯泡沫醇解产物作为再生剂实现废橡胶的力化学再生

Mechanochemical Reclamation of Waste Rubber with Alcoholysis Product of Waste Polyurethane Foam as Devulcanizing Agent

近年来,废聚氨酯和废橡胶产量呈上升趋势,其资源化循环利用成为研究热点。文中使用丙二醇作为醇解剂在不同温度下分解聚氨酯泡沫,并利用聚氨酯醇解产物作为再生剂实现了废橡胶的力化学再生。醇解产物下层液(PAPL)含有较多的胺类基团,可与橡胶再生过程中产生的自由基结合,提高橡胶的脱硫程度,从而提高再生胶(RRs)的力学性能。与只填加活化剂的RRs相比,在原有活化剂填加份数的基础上,加入PAPL可缩短RRs的最佳硫化时间,提高交联密度。使用180℃制备的聚氨酯醇解产物下层液,RRs硫化橡胶的综合性能最好,拉伸强度达到15.6MPa,断裂伸长率达到325.5%。该方法实现了废聚氨酯和废橡胶的双重高价值回收,应用前景广阔。

In recent years,the production of waste polyurethane and waste rubber has been on rise,and their resourceful recycling has become a research hotspot.In this paper,propylene glycol was used as alcohololytic agent to decompose polyurethane foam at different temperatures and polyurethane alcohololysis products were used as devulcanizing agent to realize the mechano-chemical reclamation of waste rubber.The polyurethane alcoholysis product at the lower layer(PAPL)contains more amine groups,which can combine with the free radicals generated during the rubber reclamation process to enhance the degree of devulcanization of rubber,thus improving the mechanical properties of the reclaimed rubbers(RRs).Compared with RRs filled with the activator only,the addition of PAPL can shorten the optimal vulcanization time of RRs and increase the crosslink density.The best overall performance of the vulcanized RRs is achieved using PAPL prepared at 180℃,with the tensile strength of 15.6 MPa and elongation at break of 325.5%.The method realizes the dual high-value recycling of waste polyurethane and waste rubber and shows promising prospects.This article provided a practical and feasible method for the dual high value utilization of waste polyurethane and rubber,and provided a new approach for the reuse of waste polyurethane products through chemical recovery.