| 摘要 |
There is disclosed a process for the continuous production of an aqueous amino formaldehyde resin solution, preferably melamine formaldehyde resin solution (MF) or urea formaldehyde resin solution (UF) or melamine-urea-formaldehyde resin (MUF) comprising the steps of: a. preparing a reaction mixture of an amino compound and an aqueous formaldehyde, b. adding a catalyst to the reaction mixture, c. condensation reacting the reaction mixture in the presence of the catalyst, characterised in that, in step a) the amino compound and the formaldehyde are added as a concentrated aqueous solution or as a solid to a total solid content in the reaction mixture of 40 - 85 wt% (dry weight relative to the total weight of the reaction mixture), wherein in step c) the condensation reaction takes place in a continuous plug flow of the reaction mixture and wherein, in step b) the catalyst is continuously added and finely dispersed into the reaction mixture through one or more addition points and in optional step d) adding an amount of amino compound after condensation, in optional step e) removing water to reach a higher solid content. |
