| 摘要 |
Method for acid catalyzed preparation of polyamine of diphenylmethane series comprises reacting aniline and formaldehyde and adjusting a water content in the acid reaction mixture to less than 20 wt.% and a protonation degree of less than 15%; and increasing the temperature of the reaction to 110-250[deg]C, when the weight ratio of p-aminobenzylaniline to 4,4'-diphenylmethane diisocyanate in the acid reaction mixture is less than 1. Method for acid catalyzed preparation of polyamine of diphenylmethane series comprises reacting aniline and formaldehyde with a molar ratio of 1.5:1-6:1 at 20-100[deg]C, where adjusting a water content in the acid reaction mixture to less than 20 wt.% and a protonation degree of less than 15%; and increasing the temperature of the reaction to 110-250[deg]C, when the weight ratio of p-aminobenzylaniline to 4,4'-diphenylmethane diisocyanate in the acid reaction mixture is less than 1. Independent claims are also included for: (1) the preparation of polyisocyanate of diphenylmethane series comprising producing polyamine of diphenylmethane series by the above method and subsequently phosgenising the polyamine; and (2) the preparation of polyurethane comprising producing polyisocyanate of diphenylmethane series by the above method and converting with polyetherpolyol and/or polyesterpolyol to polyurethane. |
