| The polymer materials with its'special advantages have been used widely in many fields such as aeronautics, astronautics, architecture, mechanics, home electrical equipments, commodity and so on. With the increasingly higher demands of material performances, for example, portability, energy saving, presentability, comfortableness, low-cost, easy processing etc., the consumed amount of polymer materials will keep on increasing, in the transportation fields, especially in the auto industry, and so, more and more plastic wastes will be produced. The traditional methods of burning and landfill, not only waste resources, but also cause the environmental pollution. Therefore, how to recycle"the white pollution"becomes an important problem that is urgent to be solved.Under the background, the paper focuses on the hot-pressing technique of glass fiber and waste polypropylene (PP). The factors influencing the mechanical properties of composites were discussed and the optimum conditions were obtained. The results show that the ideal warm-press process for the optimum shaped capability and mechanical properties of the board 300×200×1mm3 are 185℃and 2.33MPa. Considering the cost-benefit and mechanical properties the ideal quality proportion of pure and waste polypropylene is 1:4. When the content of glass-fiber is 25% the mechanical properties of PP composite are optimum. Sticking strength of the interface between PP and GF can be increased by adding 5% KH-550 coupling agent. And it is found that polypropylene-graft-maleic anhydride with its optimum content of 4.5% on the mechanical properties of GF/PP composite is superior to that of acrylic acid grafting PP. The SEM photos show the relation between microcosmic structure and macroscopica properties of the composite, which is helpful to the composition design and processing technique. Besides, trial manufacture of the big practical board has been studied in the article. Not only can the study be applied to recycle the waste plastic produced in automobile, but also it can provide reference to research into the recycling of other plastics. |
