摘要 |
<p>Polyurethane can be reclaimed from solvent-containing or solvent-free polyurethane wastage by adjusting the amount of solvent, preferably with methyl ethyl ketone; adding an emulsifier, preferably, acylpolyethyleneglycolester; then adding about twelve times the wastage weight of water; mixing, preferably for about one hour at room temperature to form an emulsion; and then expelling the solvent as a two-phase distillate using steam; separating solvent from the resulting two-phase distillate; filtering off polyurethane granular material left floating in the water residue, and drying the separated granular material.</p> |
申请人 |
FA. CARL FREUDENBERG, 69469 WEINHEIM, DE |
发明人 |
HAUSDORF, JOERG, W-6149 FUERTH, DE;ANSELM, BARDO, W-6947 LAUDENBACH, DE;KOSACK, STEFFEN, DR., W-6733 HASSLOCH, DE |