Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

A melamine/formalin prepolymer solution obtained by heating a mixture of 44 parts of distilled water, 3.9 parts of melamine, and 6.5 parts of 37% formaldehyde solution (formalin) to 60° C. for 30 minutes was added to the emulsified dispersions described above and the pH thereof was adjusted to 6.0. Then, the temperature of the mixture was raised to 65° C., and the mixture was stirred for 3 hours to perform reaction. To the reaction mixture was added 7.7 parts of urea to treat remaining formalin and then the pH thereof was adjusted to 9.5 with an aqueous solution of sodium hydroxide to provide a dispersion of melamine/formalin resin microcapsules having particle size of 3.5 μm.

Provenance & Evidence