Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

Specifically, melamine is added to an aqueous solution of formaldehyde having a pH adjusted to 8 to 9; while being maintained at a temperature of60° to 90° C., the obtained mixture is stirred to conduct dissolution and a reaction; at the point of time at which the solution hasbecome cloudy, the mixture is cooled in a suitable time to stop the condensation; the resulting mixture is dried by spraying or the like to give crude melamine-formaldehyde polycondensate as a powder; this crude melamine-formaldehyde polycondensate is washed with warm water (50°to 70° C.) for 30 minutes to one hour and filtered; the residue was dissolved in dimethyl sulfoxide and insoluble solids are removed by filtration; the filtrate is added to a large excess of acetone to form precipitates, which are recovered by filtration and dried; thus, pure melamine-formaldehyde polycondensate can be obtained as a white powder.

Provenance & Evidence