造纸污泥/PVC木塑复合材料的制备工艺

Preparation Technology of Paper Mill Sludge/PVC Wood Plastic Composites

目的研究造纸污泥/PVC木塑复合材料的制备工艺。方法以造纸污泥为原料,PVC为塑料基体,采用热压成形技术制备木塑复合材料,探讨污泥填充量、热压时间、温度、压力和偶联剂用量等因素对复合材料力学性能的影响,并采用扫描电镜和红外光谱对复合材料和造纸污泥进行表征。结果造纸污泥填充量为50%,偶联剂占污泥用量的2%,热压时间为10 min,热压温度为180℃,热压压力为6 MPa时,所制备复合材料弯曲强度为35.73 MPa,拉伸强度为12.75 MPa,具有良好的力学性能。扫描电镜显示,经硅烷偶联剂改性后污泥与PVC制备的复合材料,界面相容性明显改善,材料力学性能明显提高。红外光谱分析证明,偶联剂与造纸污泥发生了交联反应,形成了化学键接。结论采用造纸污泥与PVC共混制备木塑复合材料的工艺是可行的。

Objective To study the preparation technology of paper mill sludge/polyvinyl chloride （PVC） wood plastic composites （WPC）. Methods The WPC were prepared by hot press molding technology with paper mill sludge as reinforced material and PVC as plastics matrix, and the effects of paper mill sludge content, hot pressing time, temperature, pressure, and dosage of coupling agent on the mechanical properties of the composites were investigated, respectively. In addition, the composites and paper mill sludge were characterized by scanning electron microscope （SEM） and Fourier transform infrared spectroscopy （ FT-IR）, respectively. Results Under the conditions of a paper mill sludge content of 50%, a weight percent of coupling agent/paper mill sludge of 2% , a hot pressing time of 10 min, a temperature of 180℃, and a pressure of 6 MPa, the bending strength and tensile strength of the paper mill sludge/PVC composite were 35.73 MPa and 12.75 MPa, respectively, indicating the favorable mechanical properties of the composite. SEM analysis showed that the interfacial compatibility of the composite prepared by silane coupling agent-modified paper mill sludge and PVC was significantly improved, resulting in the enhancement of its mechanical properties. FT-IR analysis indicated that crosslinking reaction had occurred between the coupling agent and the paper mill sludge, forming chemical bonding. Conclusion It is feasible to prepare WPC with the blend of paper mill sludge and PVC.