木粉/废旧橡胶粉/HDPE三元复合材料的微孔结构及拉伸性能

Micro Porous Structure and Tensile Properties of Wood-rubber & HDPE Composites(WRPC)

以废旧橡胶粉、意杨胶合板砂光粉和聚乙烯(HDPE)为主要原料,结合碳酸氢钠(Na HCO_3)发泡剂、马来酸酐改性聚乙烯(MA-PE)偶联剂和聚乙烯蜡润滑剂,采用挤压工艺生产木橡塑复合材料(WRPC)。详细探讨了木粉、橡胶与HDPE配比及发泡剂用量对WRPC材料内部微孔结构及拉伸性能、湿性能的影响。结果表明:无论发泡与否,WRPC材料均具有大量泡孔,泡孔的数量、尺度和形态与物料配比,尤其是HDPE和发泡剂的用量密切相关;WRPC材料具有优异的拉伸性能和湿稳定性,在挤压工艺不变时,木粉、橡胶粉和HDPE的用量对拉伸强度具有明显影响,且具有交互效应,根据交互影响结果可绘制性能等位线;发泡后WRPC材料密度明显降低,拉伸强度减小而吸水率增大,当发泡剂用量为3%时,拉伸强度最大。研究结果为订制特定需求的WRPC材料提供了可靠的理论和应用借鉴。

We used waste tire rubber powder,sanding of poplar plywood and HDPE to manufacture wood rubber plastic composites（ WRPC） by extrusion process combined with a foaming agent（ NaH CO_3）,coupling agent（ MA-PE） and lubricant（ PE-Wax）. We studied the influences of raw materials composition on WRPC internal micro porous structure,tensile and hygroscopic properties. Both foamed and control WRPCs contain considerable micro in-situ pores,and the quantity,size,and shape of the pores are affected by WRPC composition especially the contents of HDPE and NaH CO_3. WRPCs have sound anti-tensile and wet stability performance. The contents of wood flours,rubber powders,and HDPE have evident influence and interaction on WRPC tensile strength（ TenS） and water absorption（ WA）. Isocurves were successfully drawn according to the interaction results. Foamed WRPCs showed lower density and TenS while higher WA values compared to control. The maximum TenS value was achieved when 3% of NaH CO_3 was added. The above research results may be reliable for reference to design and produce WRPCs for designated applications.