Flexible polyurethane foam scrap was chemically decomposed via glycolysis. Optimal reaction conditions for glycolysis were determined: temperature, 220 C, polyurethane/glycol ratio, 1:1; reaction time, 2.5 hr; diethylene glycol or dipropylene glycol as reagents. Two types of polyurethane scrap were tested; both gave the recycled polyols having the same properties, which is advantageous for possible applications on a commercial scale. A mixture of the virgin and recycled polyols (up to 36 wt%) was used to manufacture rigid polyurethane foams. No undesirable influence of the recyclates on process parameters (cream time, gel time) was found. The end-use properties of the rigid foams were practically the same in the whole range of tested concentrations of recyclates. A fine cellular structure of all tested foams was found.
Glycolysis of flexible polyurethane foam in recycling of car seats
2007
8 Seiten, 16 Bilder, 5 Tabellen, 16 Quellen
Conference paper
English
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