双层共挤木塑复合地板的性能表征

Properties Characterization of Co-Extrusion Wood-Plastic Composite Floor with Double Layers

以废旧塑料、木粉及抗氧剂等助剂为原料,利用共挤出的方法,制备了带有表层和芯层的木塑复合地板,主要对表层材料进行改性而不考虑芯层材料的耐候等性能,测试了该木塑复合地板的物理力学、抗低温和耐候性能。结果表明,双层共挤制备的木塑复合地板的拉伸强度为23.98 MPa,弯曲强度和弯曲弹性模量分别为38.53 MPa和3 200 MPa,弯曲破坏载荷为4 300 N,高于单层挤出的木塑复合地板(3 300 N),且其经循环冻融实验后的保持率为98.7%,低温落锤冲击下无破裂,吸水率为0.17%,,加热后尺寸变化率为0.12%,氧化诱导期为77.5 min,远高于单层挤出的木塑复合地板(15.4 min),具有较好的综合性能。该木塑复合地板同时达到了日本木塑地板性能测试标准的要求,有效解决了因回收废旧塑料批次不稳定而产生颜色、耐候性、尺寸变化率、弯曲性能波动或不佳等问题,扩大了废旧塑料的利用范围,具有较高的性价比。

Taking waste plastic, wood powder and addition agent such as antioxidant etc. as raw materials, wood-plastic composite floor with surface layer and core layer was prepared by co-extrusion technology ,modification was mainly done for surface layer materials and properties of core layer materials such as weathering resistance etc wasn＇t considered. Physical, mechanical, low temperature resistance and weathering resistance properties of the floor were tested. The results show that tensile strength of the floor is 23.98 MPa, bending strength and bending elastic modulus are 38.53 MPa and 3 200 MPa, bending failure load is 4 300 N and higher than that of wood-plastic composite floor with single layer （3 300 N）, it only declines by 1.3% after cycles of freeze-thaw test. The floor with double layers don＇t destroy under the drop-weight impact at low temperature, it＇s water absorption is 0.17%, dimensional change rate after heating is 0.12% and oxidation induction time is 77.5 min which is higher than that of wood-plastic composite floors with single layer （15.4 min）, meanwhile, it achieve the requirements of wood-plastic composite floor properties test standards in Japan. The floor with double layers solves the problems that color, weathering resistance, dimension change rate, bending strength performance are fluctuation or bad because of waste recycling batch being unstable, it enlarge the application range of waste plastic and has high performance / price ratio.