| abstract |
The invention relates to a chromatophilous aromatic polyurethane resin, comprising the following components (by weight percentage): 0.5-1.5% of polyester polyol, 0.5-1.5% of polycarbonate diol (PCDL), 9-15% of mixed polyether polyol, 1-3% of chain extender, 6-9% of methylene diphenyl diisocyanate (MDI) and 75-80% of solvent. The preparation method of the chromatophilous aromatic polyurethane resin comprises the following steps: allowing polyester polyol, PCDL, mixed polyether polyol, chain extender, part of MDI and part of N,N-dimethylformamide to react at 60-90 DEG C for 2 hours until the system viscosity reaches 40-60Pa.s at 50 DEG C; adding the rest solvent and MDI, and stopping the reaction when the final system viscosity reaches 30-50Pa.s at 25 DEG C. |