Research And Development Of PVC/lignin Composites

Because of their sustainable and environmental friendly properties, the Wood-plastic Composites (WPC) conforms to the development of modern material-environmental friendly material. In recent years, the development and application of WPC have been increasing dramatically. The lignosulphonate is the waste residue in papermaking industry, and discharges abundantly every year, and its valid utilization is small quantity. Moreover, the development of WPC from the by-product in papermaking industry resources has pioneered a new field for utilizing the abundant papermaking residues. On the one hand, the utilization of the lignosulphonates and plastic wastes can decrease environmental pollution and it is good to do further treatment. On the other hand, it can develop and utilize regenerative resources, and solve the waste of resources.Polyvinyl chloride (PVC) /Calcium lignosulfonate (LsCa) powder wood-polymer composite (WPC) was studied through extrusion moulding, developing new method of utilization lignosulphonate.The process technology for making of PVC/LsCa composites was determined in the study and has designed a set of experimental route. In this thesis, LsCa and PVC were selected to the primary materials, and joined some important processing aids to improve the material workability. The effects of lignin powder contents, powder place and aids conditions on the properties of composite material were analyzed by tensile test, bending test and impact test, the optimal of composites were determined. The miscrostructure characteristics of the composites were analyzed by the scanning electron miscroscopy (SEM) and the fourier transform infrared spectrometer (FT-IR).The experiment results indicated that the quantity of LsCa and aids influenced evidently the mechanical property of the composites. Regarding the same habitat, the same content of LsCa and differently aids making the composites, and in the same content and different habitat of LsCa, its tensile strength, bending strength and the non-gap impact intensity are all different; The bending strength rises first, and it drops later with the increase of LsCa, and up to the best when its quantity was about 60%, but the tensile strength and non-gap impact strength influences little. Its main properties are better than the panel's, and they are worse compare with PVC. It's a new composite material.