Graded Recycled Polymers Modified by Thermoelastoplasts: Composite Materials to Be Used for Injection Molding

An approach is outlined to develop procedures to process composite materials based on recycled polyolefins and other plastics obtained from sorted solid communal waste into molded products using injection molding. New temperature and concentration regimes are suggested for injection molding of polymeric mixtures containing recycled polymers and styrene and polyolefin thermoelastoplasts. Samples of molded products having different compositions obtained from polymeric mixtures. Preliminary components (recycled polypropylene and low-density polyethylene) and polymeric mixtures containing these components are studied using physical and chemical methods (Fourier IR spectroscopy, thermogravimetric analysis, and differential scanning calorimetry). The comprehensive study confirms that modifying recycled polypropylene with a styrene–ethylene–butylene–styrene copolymer and by ethylene–octene copolymer plasticized thermoplasts reduces the degree of crystallinity, resulting in better compatibility of polymers, which allows introducing dyes as dispersed fillers.