The Study Of New Reclaiming Way

Now China is the world’s largest rubber consumer, and is also the largest importerof rubber, either natural rubber or synthetic rubber must rely on imports. Production ofreclaiming rubber is not only conducive to improving our country’s dependence onforeign rubber, but also to achieve the requirements of environmental protection andsustainable development. At present, the reclaiming rubber industry of China, there aremany problems, for example high pollution, high energy consumption, low output etc.This paper investigated the system commonly used in rubber compounding agents asreclaiming agents to influencereclaiming effect of waste tire powder and reclaimingproperties of vulcanized rubberin different conditions, to look for newefficient﹑saving energy﹑environmental protection of reclaiming method.Usingthe torque rheometer mixed waste tire powder and softener, and reclaimedwaste tire rubber powder by mechanical-chemical method. Experimental results showthat the increase of the mixing temperature and the extend of mixing time havesignificant effect on thereclaiming effectand the properties of reclaiming vulcanizedrubber. When the mixing temperature is high and the mixing time is long,thereclaiming rubber have high sol content and low crosslink density, and scorch timeand cure time and process cure time changes little, while the properties of reclaimingvulcanized rubber improve. When the mixing temperature exceeds160℃, andmixing time exceeds10min, mechanical properties of recycled rubber reduce.Therefore, when using the torque rheometer mixed waste powder and softener,mixedtemperature of100℃and mixing time of10min have the good reclaiming effect.To explore a variety of structural types of disulfide accelerator asreclaimingagents,the reclaiming effect of thiuram accelerators is best. Different amounts of tetramethylthiuram disulfide (TMTD) anddifferent amounts of four benzyldisulfide thiuram (TBZTD) by mechanical method to reclaim the waste rubber powderat different times,the experimental results show that the amount of TMTD and TBZTDincrease and reclaiming time extend, the reclaiming effect is good, and reclaimingvulcanized rubber have excellent performance; using scanning electron microscopy(SEM) to observe tensile fracture, we can find when the amount of TMTD andTBZTD is less, there areuneven surface and small particles; and the larger amount,cross-section sleek. Considering the reclaiming effect and recycled rubberperformance, the amount of TMTD is1.0phrand reclaiming time is10min appropriate;while the amount of TBZTD is1.69~2.25phrand the regeneration time is10min,thereclaiming effect appropriate.Combination with different accelerators，to study different amounts of TMTD/DTDM to reclaim waste tire rubber powder, experimental results show that with theincrease amount of DTDM,the reclaiming effectincreased,and thephysical-mechanical properties improved; the amount of DTDM continues toincrease, the reclaiming effect reduce, and the performance of reclaiming rubber cutdown; considering the amount of TMTD/DTDM is0.8/0.2phr, and the reclaimedrubber has good performance. Different amounts of TMTD/DM to reclaim waste tirerubber powder, experimental results show that with the increase amount of DM, thereclaiming effect to improve and the physical-mechanical properties improved; but theamount DM continues to increase, the reclaimingreduce and the performance ofrecycled rubber cut down; considering the amount of TMTD/DM is0.6/0.4or0.5/0.5phr,and the reclaimed rubber has good performance.Using a variety of structural types of antioxidant as reclaiming agents toinvestigate the reclaiming effect of waste tire rubber powder, we can discovery thatthe reclaiming effect of hindered phenolic antioxidant work best. The results showedthe content increase and the reclaiming time extend, the reclaiming effect isenhanced and the physical-mechanical properties is improved; though scanningelectron microscope (SEM) to observe cross-section of tensile fracture, the resultsshow that when the amount of antioxidant264more and reclaiming time longer time,tensile fracture smooth and have no small particles. Considering,when the amount ofantioxidant264is1.0phr,2246the amount of antioxidant is0.8phr,1010the amount of antioxidant is1.33phr, and the reclaiming time is13min, the reclaimed rubber havethe best performance.