Melamine, commonly known as melamine, protein essence, molecular formula C3H6N6, IUPAC named "1,3,5-triazine-2,4,6-triamine", is a triazine nitrogen-containing heterocyclic organic Compounds are used as chemical raw materials. It is a white monoclinic crystal, almost odorless, harmful to the body, and cannot be used in food processing or food additives.

physical property and chemical properties

Appearance: white monoclinic crystal.

Melting point: 354°C

Boiling point: 557.54°C

Flash point: 325.2°C

Refractive index: 1.826

Density: 1.661g/cm3

Solubility: insoluble in water, slightly soluble in ethylene glycol, glycerin, ethanol, insoluble in ether, benzene, carbon tetrachloride

Chemical Properties

It is non-flammable and 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 neutral or slightly alkaline conditions, it condenses with formaldehyde to form various methylol melamines, but in slightly acidic conditions (pH=5.5~6.5) it undergoes polycondensation reaction with methylol derivatives to form resins. When it is hydrolyzed with strong acid or strong alkali aqueous solution, the amine group is gradually replaced by hydroxyl group, firstly to generate ammeline, further hydrolyzed to generate ammeline, and finally to generate cyanuric acid.

Molecular Structure Data

Molar refractive index: 33.23

Molar volume (cm3/mol): 75.9

Isotonic specific volume (90.2K): 267.2

Surface tension (dyne/cm): 153.2

Polarizability (10-24cm3): 13.17

Use

It is mainly used as the main raw material for the manufacture of melamine formaldehyde resin, as a reagent for organic element analysis, and also used as a tanning agent and filler for leather processing in the synthesis of organic and resin.

Security Information

safety term

S36/37: Wear suitable protective clothing and gloves.

Wear appropriate protective clothing and gloves.

R20/21：Harmful by inhalation and in contact with skin.

R44：Risk of explosion if heated under confinement.

Risk Term

R20/21: Harmful by inhalation and in contact with skin.

Harmful by inhalation and in contact with skin.

R44: Risk of explosion if heated under confinement.

There is a risk of explosion if heated in a closed container