Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

Independently, to 31.5 g of melamine were added 52.2 g of 37% aqueous solution of formaldehyde and 170.3 g of water, and the resulting mixture was stirred at 60° C. for 30 minutes to obtain a transparent melamine-formaldehyde precondensate. To the above-prepared WOW emulsion at 40° C. was added 25 g of the precondensate. The mixture was stirred at 1,200 r.p.m. using a propeller wing, and was adjusted to pH 5.0 using 2N sulfuric acid. The mixture was then heated to 70° C. for 30 minutes, and stirred for 30 minutes. Further, to the mixture was added 10.3 g of 40% aqueous solution of urea, and the mixture was adjusted to pH 3.5 using 2N sulfuric acid, and then stirred at 70° C. for 40 minutes.

Provenance & Evidence