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PET Recycling by Asphalt Compounding

PET Recycling by Asphalt Compounding

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7th World Congress on Recovery, Recycling and Re-integration

作者： Mariana Stanica-Ezeanu gheorghe brebeanu Dorin Stanica-Ezeanu Petroleum and Gas University 39 Bucuresti Bvd. Ploiesti Prahova 100680 Romania Petroleum and Gas University 39 Bucuresti Bvd. Ploiesti Prahova 100680 Romania Petroleum and Gas University 39 Bucuresti Bvd. Ploiesti Prahova 100680 Romania

The aim of this work is to develop secondary end use applications of waste PET by a process for improving the asphalt quality using different mixtures of oligomers obtained from waste PET by chemical depolymerization. We started the research by the depolymerization process of waste PET by glycolysis. Experiments were carried out in a continuos stirring glass reactor at a temperature of 180℃ and normal pressure. The reaction mixture consisted of 5 g of ground PET (2-5 mm), 100 mL of solvent reagent (monoethylene glycol, MEG, or polyethylene glycol, PEG) and 1% of zinc acetate as catalyst. The chemical depolymerization products were identified by gel permeation chromatography and the main products are the glycol-terephthalic acid-glycol (GTG) adduct (53 wt.%) and GTGTG (29%) "dimer" respectively. The rest is composed of different low polymerization degree compounds like GTGTGTG, GTGTGTGTG or GT esters. Finally, each type of the asphalt was mixed with different proportions (5%-30 wt%) of waste PET depolymerization products and the compounded asphalts (CA) were characterized. The CA rheological properties (softening point, penetration index, and Frass brittle point) are related with chemical characteristics of asphalt, the type of solvent agent and the quantity of depolymerization product added. An improved quality of the compounded asphalt is observed for two of three types of tested asphalt, and we suppose that chemical composition related with the type of depolymerization product (adduct) is responsible for this behavior.

关键词： recycling, PET, asphalt

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