PREPARATION OF RECYCLED PLASTICS FROM DEPOLYMERISED MATERIALS OF WASTE FRPS

摘要

The preparation of recycled plastic from the depolymerized materials is the final stage for the chemical recycled process.[1] Recently, we have developed an efficient method to depolymerize waste fiber-reinforced plastics,[2] one of the formidable plastic to treat in chemical recycling scheme, by treatment with supercritical MeOH.[3] For this process, addition of catalytic amounts of DMAP, NmN-dimethylaminopyridine,[4] was essential for the complete break down of FRP. The monomeric material made by this way, however, failed for the formation of recycled polymers due to the contamination of impurities derived from the decomposition of DMAP. This is a problem to be overcome for establishing efficient chemical recycling of FRP. Removal of the impurities and purification of the recovered materials were achieved by washing treatment with water and the purity of dimethylphthlate, DMP, was enhanced to more than 90%.[5] Although this was a satisfactory solution of the problem, the washing treatment was somewhat troublesome in the practical manipulation.