INVESTIGATION OF RECYCLING PROCESSES OF MIXED WASTE OF CONSUMPTION OF THERMOPLASTICS AND INTRODUCTION OF PRODUCTS ON THEIR BASIS IN INDUSTRY

Abstract

Developed technologically compatible polymer composite materials with controlled properties on the basis of partially oxidized polyolefins and polystyrene, the level of properties which is not inferior, and in some cases 1.2-1.4 times higher than the level of properties of compositions on the basis of certified materials. Revealed that the secondary polyethylene and polystyrene plastics have smaller (in comparison with primary materials) the junction temperature in the highly elastic state and the interval of basketcount less resistance to deformation and, consequently, less ability to change modes of processing. Comparison of properties of primary plastics and plastics that were taken from the waste of consumption, shows that both polyethylene and polystyrene in the process of operation undergo significant property changes. To a greater extent these changes in the secondary materials compared to primary occur in the polyethylene (a gel-fraction, unsaturated the group consisting of oxygen, decreases the molecular weight and the melt flow rate). Studied the degree of aging and related natural changes of the chemical structure of recycled polyethylene and polystyrene plastics on the properties of composite materials. In addition to aging, a significant impact on the processes of thermo - and photo-oxidation has a supramolecular structure of polymers, which significantly influences the formation of a complex of operational properties of products. The dependence of viscosity of the mixture at different temperatures and the value of shear stress shows that there is a sharp decrease of melt viscosity that occurs in mixtures of polymers in a time close to the limit of compatibility. Reveals that the use of only partially oxidized polyethylene and polystyrene oxidized, or only one component (polyethylene or polystyrene) does not lead to a substantial increase in the strength characteristics.