碳化硅对聚氯乙烯/竹粉复合材料性能影响

Effect of SiC on Properties of Polyvinyl Chloride/Bamboo Powder Composites

为比较碳化硅(SiC)含量对聚氯乙烯(PVC)/竹粉木塑复合材料性能的影响,以竹粉为木质纤维,PVC为基体材料,用挤出成型方法制备了不同含量SiC的PVC/竹粉复合材料,对其力学性能、摩擦磨损性能及蠕变性能测试分析。结果表明:当SiC质量分数为3%时,PVC/SiC/竹粉复合材料拉伸强度和冲击强度性能较好,较未添加SiC的PVC/竹粉复合材料分别高出29.0%,4.2%;SiC质量分数为3%时,摩擦系数、磨损失重率最小分别为0.428 5,0.151%;添加1.5%SiC的PVC/竹粉复合材料弯曲强度最高,为36.6 MPa。蠕变应力值为3.552 8 MPa时,SiC含量对PVC/竹粉木塑复合材料应变影响相近,其中,PVC/竹粉/1.5%SiC复合材料应变值最小;应力值为7.105 6 MPa、10.658 4 MPa时,PVC/竹粉/3.0%SiC复合材料应变值最小。

In order to compare the effects of silicon carbide(SiC) content on the properties of polyvinyl chloride(PVC)/bamboo powder wood-plastic composites(WPC),PVC/bamboo powder composites with different contents of SiC were prepared by extrusion molding using bamboo powder as wood fiber and PVC as matrix material. The mechanical properties,friction and wear properties and creep properties were tested and analyzed. The results show that when the mass content of SiC is 3.0%,the tensile strength and impact strength of the PVC/bamboo/SiC powder composites are better than that of the PVC/bamboo powder composites without SiC,respectively 29.0% and 4.2% higher. When the mass fraction of SiC is 3.0%,the minimum friction coefficient and weight-loss rate of wear are 0.428 5 and 0.151%. The bending strength of PVC/bamboo composite with 1.5% SiC is 36.6 MPa.When the creep stress value is 3.552 8 MPa,the effect of SiC content on the strain of PVC/bamboo powder WPC composite is similar,and the strain value of PVC/bamboo powder/1.5%SiC composite is the lowest. When the stress values are 7.105 6 MPa and 10.658 4 MPa,the strain values of PVC/bamboo/3.0%SiC powder composites are the minimum.