Introduction to melamine

Melamine (chemical formula: C3H6N6), commonly known as melamine, protein extract, IUPAC named "1,3, 5-triazine-2,4, 6-triamino-melamine", is a triazine nitro-containing heterocyclic organic compound used as a chemical raw material. It is a white monoclinic crystal, almost odorless, slightly soluble in water (3.1g/L at room temperature), soluble in methanol, formaldehyde, acetic acid, hot glycol, glycerin, pyridine, etc., insoluble in acetone, ether, harmful to the body, can not be used for food processing or food additives. Melamine is a trimer of cyanamide, and the resin made from it releases a lot of nitrogen when it is heated and decomposed, so it can be used as a flame retardant. It is also a metabolite of the insecticide cypromazine in animals and plants.

Chemical properties: non-combustible, stable at room temperature. The aqueous solution is weakly alkaline (pH =8), and can form melamine salt with hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, etc. In the neutral or slightly alkaline case, condensation with formaldehyde to form a variety of hydroxymethyl melamine, but in the slightly acidic (pH 5.5 ~ 6.5) and hydroxymethyl derivatives of polycondensation reaction to produce resin products. In case of hydrolysis of strong acid or strong base aqueous solution, the amine group is gradually replaced by the hydroxyl group, which becomes a cyanuric acid diamide, further hydrolysis to cyanuric acid monoamide, and finally cyanuric acid.