Study On Properties Of Fiber-reinforced Waste Plastic Based Composite

Reuse of the waste plastic is propitious for saving of resources and decrease of pollution. Due to the poor properties of waste plastic, its application is limited, and its recovery is influenced too. The composite that is based on fiber-reinforced waste plastic increases the mechanical properties of waste plastic and expand its application range. As the fiber-reinforced composite must has good ductility, first of all the mixing reinforcement of waste PE and PP were studied. The optimum mixture ratio was acquired with a little decrease of strength. The optimum mixture ratio of HDPE/LLDPE is 40/60～20/80, for PP/HDPE it is about 80/20, for PP/LDPE it is 80/20～60/40.Then the influence of low- temperature plasma surface treatment on interface shearing strength between reinforcing fiber and matrix was investigated. The stronger combination of fiber and matrix after plasma treatment was discovered. The mechanism of reinforcement of interface combination with plasma treatment was developed as follows: By means of plasma treatment, the wettability of fiber's surface was increased, specific area of fiber was enhanced owing to the etching process, the meshing engagement between fiber and matrix was enhanced. With the same parameter (power, vacuum degree, processing gas), the optimum time of plasma treatment is 1～2 minutes.In the end, the mechanical properties of waste plastic based composite treated by short fiber space random process was investigated, the comprehensive mechanical property of this kind of composite appeared much better. The manufacturing technology of waste plastic based composite treated by short fiber space random process was presented.With the macro measurement, the tensile property, the flexural property and impact property were studied. The compatibility was investigated by micropolariscope. By means of optical microscope, the influence of plasma treatment on shearing strength, and the dispersion status of fiber in the matrix were analyzed. The mechanism of interface combination reinforcement with fiber-plasma treatment was developed by SEM.