Study On The Properties Of PVC/Wood-Flour Filling System

In recent years, the consumption of wood was restricted for the lack of forest resource. But the demand of ornamental materials of wood was sharply increasing with the improvement of living level and housing. It was a hot subject in the field of material science to develop a new kind of ornamental material to replace the wood. Much attention was paid on thermoplastics filled with plant-fibers to produce wood-like plastics.In this paper, Poly(Vinyl Chloride )resin and wood flour which was made of waste materials from wood processing factories were selected to synthesize wood-like ornamental plastics on the basis of the principle of polymer filling and modification through the technique of compound mixing. The effects of the kind of wood flour, the dosage of filler, particle size, plasticizer, different primers and treatments of wood flour and toughing agents on filling system were studied respectively.The results showed that the effects of the kind of wood flour on the mechanical properties of the composite were little and could be neglected. The higher the dosage of filler was, the worse the mechanical properties were. But the ball-pressing hardness, heat-resistance and moisture absorption were improved slightly. Meanwhile, the processing property of the filling system became difficult. With the same dosage of filler, the mechanical properties, hardness, heat-resistance were increased with the particle size decreasing, but the moisture absorption diminished. DOP would bring about the drop of the tensile strength of the composite and the improvement of the impact strength. The processing property was good. The properties of the filling system were improved by the treatment of the wood flour, especially the wood flour treated by NaOH and coupling agents. The toughness of the filling system was ameliorated by the toughing agents, but some properties of the material such as tensile strength and so on were decreased at the same time. Among the toughing agents CPE had better effects on the wood flour filling PVC system.