Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

Separately, a mixture of 40 parts of melamine, 100 parts of a 37% aqueous formaldehyde solution and 260 parts of water was adjusted to pH 9.0 with sodium hydroxide and then was heated at 60° C. with stirring to perform dissolution to obtain 400 parts of a transparent melamine-formaldehyde precondensate. 400 parts of this melamine-formaldehyde precondensate was added gently to 647.5 parts of the above emulsified and dispersed liquid and reaction was allowed to proceed for 4 hours with stirring in a thermostat set at 60° C. Then, the product was cooled to room temperature to prepare microcapsules. It was confirmed that the resulting microcapsules had an average particle diameter of 10 μm which was almost the same as that of the agglomerates and had a roundish fusiform shape. Solid concentration of the aqueous dispersion of the microcapsules was 23%.

Provenance & Evidence