| In this paper,60mesh waste rubber powder (WRP) was added directly into the saturated thermoplastic polyolefin elastomer (POE) to obtain a type of green and cheap thermoplastic elastomer material with good performance. The mechanical performance, dynamic mechanical property, the aging performance and repeat processing performance were investigated. The mechanical property of the blends of two grades POE with WRP was first studied, and then the better one was selected. The effect of the treating method of WRP in the open mill on the mechanical property of the blends was studied. The reinforcing effect of four kinds of fillers on WRP/POE blended TPE, the aging resistance of the filling system of carbon black and silica, and the repeat processing properties of WRP/POE/carbon black were tested.The results showed that the properties of the POE (Engage8003)/WRP blends is superior to POE (Engage7387)/WRP system. The way of rubber powder treated30min in the open mill then added into POE can further improve the performance of the POE (Engage8003)/WRP blends; adding carbon black, silica, calcium carbonate, diatomite earth to fill POE(Engage8003)/WRP blends respectively, it was found that the properties of the blends were gradually increased with the increase of both the fillers of carbon black and silica, with the increase of both the filler of calcium carbonate and diatomaceous earth, the mechanical properties of the blends were gradually decreased, the reinforcing effect of the first two fillers were significantly superior to the latter two. After heat-aging at120℃for72h conditions, WRP/POE/silica blends still maintained a good anti-aging properties, and the increase of silica was better for maintaining the strength of the WRP/POE/silica system. After heat-aging at80℃×168h, compared to non-aging system, the tensile strength, tear strength and hardness of WRP/POE/carbon black blends were increased and the elongation at break was decreased and the maximum rate of change was-8.8%, and it indicated that this system has excellent anti-heat aging property. The repeat processing properties of powder/POE/carbon black blends was investigated and found that the tensile strength, tear strength of the system decreased to some extent, and with the increase of the repeat processing times, the degree of declining of properties was still slightly. By adding50phr carbon black to POE/WRP system, after5times repeat processing, the tensile strength of the blends maintained at9.9MPa, tear strength at72.3kN/m, elongation at296%, hardness at94Shore A,300%modulus at10.0MPa, and it indicated the blends has a good thermoplastic processing property.On the other hand, by using dynamical vulcanization technology reclaimed butadiene rubber (RBR)/POE type TPV was prepared, and the vulcanization characteristics of the RBR/POE at different proportions was examined at the same sulfur vulcanizing agent. The reinforcing effect, anti-aging properties of carbon black of the material were studied in blend ratio40/60of RBR/POE and the effect of the TPV by adding the silane coupling agent (Si-69) was studied. The results showed that at same sulfur system, with the reduction of the reclaimed rubber, the scorch time (t10), optimum cure time (t90) were gradually increased, also it can be said that butadiene reclaimed rubber can still be cured by sulfur. With the increase of the amount of silica, the comprehensive mechanical property of the TPV was gradually improved in blend ratio40/60of RBR/POE. After heat-aging at condition of80℃for168h, tensile strength was considerably increased, tear strength and hardness were also decreased slightly, the elongation at break was decreased by20%on average, overall it still maintained a good anti-aging property. In same ratio system of RBR/POE/silica, the tensile strength and modulus at300%of silane coupling agent (Si-69) blending TPV were significantly improved, elongation at break and permanent set were significantly decreased, the DMA temperature-modulus curve indicated that loss factor (tan8) of the modified material significantly reduced in the high-elastic state. |
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