Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

To 5 g of melamine power, were added 6.5 g of 37% aqueous formaldehyde solution and 10 g of water, the pH of the mixture was adjusted to pH 8, and the temperature was raised to about 70° C., giving an aqueous solution of melamine/formaldehyde initial condensate. Separately, a solution of 70 g of n-octadecane as a phase-change compound and 1.4 g of castor oil as an anti-supercooling agent was added to 100 g of a solution of a styrene anhydride copolymer sodium salt adjusted to pH 4.5 while intensely stirring, and emulsification was conducted until the particle diameter became about 10 μm. Encapsulation was conducted by adding the total amount of the above aqueous solution of melamine/formaldehyde initial condensate to the thus obtained emulsified solution, stirring at 70° C. for two hours, and adjusting the pH to pH 9.

Provenance & Evidence