A study of the kinetic of synthesis and crosslinking of methylol melamine

Abstract

One mole of melamine (2,4,6 – amino 1,3,5 – triazine), approximately 126 g were reacted separately in suitable beakers on hot plate with stirrer using 144 cm³, 216 cm³, 288 cm³ , 360 cm³ and 432 cm³, of 37% formaldehyde which is equivalent to 2, 3, 4, 5 and 6 moles respectively. The reaction was carried out in the presence of little quantity sodium dihydrogen phosphate as a catalyst, at various temperatures, molar ration of the reactants and concentration of catalyst. Since melamine is hexafunctional, complete formylation produces up to hexamethylol derivative before crosslinking take place. The kinetic of the reaction were affected by varying these parameters but follows a none complicated form. The relative viscosity of each resin increase as concentration increases. Increase in the amount of catalyst used and temperature of reaction medium reduced the time of formation and subsequent crosslinking to the resins.

Keywords: Kinetic, Synthesis, Melamine