Chemical degradation of polyurethane coating waste and its resource utilization
The polyurethane coating waste was chemically degraded using mono-diethylene glycol(DEG)as an alcoholo-lytic agent to recover low molecular weight polyol,and the recovered polyol was mixed with commercial polyol as a raw material to prepare recycled polyurethane foam.The optimum parameters were determined as follows:reaction reagent ratio of 1∶2,reactiontemperature of 180 ℃,reaction time of 2 h,catalyst addition of 1.3％,under which the extraction rate of the alcoholysis product was 36.8％,hydroxyl value of 384.6 mgKOH/g,and viscosity of 476 mPa·s.The re-sults were obtained by Fourier transform infrared spectroscopy,gel permeation chromatography,thermogravimetric anal-ysis,and scanning electron microscopy.The recovered polyol and recycled polyurethane foam were characterized and an-alyzed by FTIR,GPC,TG and SEM.The results showed that the recovered polyol and polyether polyol were consis-tent in molecular structure and met the performance requirements for the preparation of polyurethane foam.When the re-cycled polyol was mixed with the commercial polyol,and the proportion of recycled polyol in the total polyol was 33％,the prepared polyurethane had good pore structure and thermal stability.
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