Post on 03-Jan-2016
Melamine
Melamine C3H6N6
PropertiesIUPAC nameMolecular formula
1,3,5Triazine-2,4,6-triamine
C3H6N6
Molar mass 126.12 g/mol
Appearance White solid
Density 1574 kg/m3
Melting point 345 °C, 618 K, 653 °F decomposition
Boiling point Sublimes
Solubility in water 3.240 g/l (20 °C)
Melamine • is an organic base and a
trimer of cyanamide, with a 1,3,5-triazine skeleton. Like cyanamide, it contains 66% nitrogen by mass and, if mixed with resins, has fire retardant properties due to its release of nitrogen gas when burned or charred, and has several other industrial uses.
• Melamine combines with cyanuric acid and related compounds to form melamine cyanurate and related crystal structures, which have been implicated as contaminants or biomarkers in Chinese protein adulterations.
Uses and Applications• Melamine is combined with
formaldehyde to produce melamine resin, a very durable thermosetting plastic used in Formica, and melamine foam, a polymeric cleaning product. The end products include countertops, dry erase boards, fabrics, glues, housewares, dinnerware, cooking spoons, guitar saddles, guitar nuts, and flame retardants.
• Melamine also enters the fabrication of melamine poly-sulfonate used as superplasticizer for making high-resistance concrete. Sulfonated melamine formaldehyde (SMF) is a polymer used as cement admixture to reduce the water content in concrete while increasing the fluidity and the workability of the mix during its handling and pouring
Advantage• nitrogen-rich compound• high nitrogen content (2/3).• making high-resistance
concrete. • It results in concrete with a
lower porosity and a higher mechanical strength exhibiting an improved resistance to aggressive environments and a longer life-time.
Limitation
• Melamine is much more expensive• Synthesis
Crystallization and washing of melamine generates a considerable amount of waste water
• Melamine poisoning by tainted food Melamine use as non-protein nitrogen (NPN) for cattle was described in a 1958 patent.[
Melamine has been involved in several food recalls after the discovery of severe kidney damages of children and pets poisoned by melamine-adulterated food.
• 5310751861 • Yanika Chirachinta
• 5310755847 • Parada Pruttitaiwa
• 5310755763 • Sirivalai Laohaniwatworn