| 摘要 |
A method for preparing para-phenylenediamine (PPD) comprises (a) inserting 10-50 wt.% of polyester and ethylene glycol into a pressurizing vessel and stirring the mixture, (b) inserting 20-60 wt.% of liquid NH3 and elevating the temp. to 100-200 deg.C, (c) inserting 20-80 wt.% of NH3 gas at 3-10 kg/cm2 pressure, (d) reacting the mixt. to obtain terephthaldiamide, and (e) forming para-phenylenediamine by Hofmann transition reaction. Pref. the total amount of NH3 is 2-3 mole times to the TPA unit. The PPD is used as a monomer of a high elastic polymer.
|
