melamine


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melamine

(mĕl`əmēn'), common name for 2,4,6-triamino-1,3,5-triazine. Melamine is a trimer (see polymerpolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
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) of cyanamide, H2NC≡N, and is synthesized from calcium carbide. It condenses with formaldehyde to give a thermosetting resinresin,
any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing like glass;
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. Melamine resins have many uses, including the manufacture of plastic dishes under the trade name Melmac. Melamine also is notorious as a toxic adulterant of food and feed products. It is added to boost a product's nitrogen content, which is used by certain tests to estimate the product's protein content.

Melamine

 

2,4,6-triamino-5-triazine; colorless crystals. Melting point, 354°C (with decomposition). It is virtually insoluble in cold water and most organic solvents. Melamine is a base, which interacts with acids to form salts (for example, C3H6N6HCl) that decompose upon heating. It is prepared from dicyandiamide, (NH2— C≡N)2, at a temperature of 180°-500° C and a pressure of 4–20 meganewtons per sq m (40–200 kilograms-force per sq cm).

Melamine is used in the manufacture of melamine-formaldehyde resins (plastics, adhesives, and varnishes), ion-exchange resins, tanning agents, and hexachloromelamine (which is used in the preparation of dyes and herbicides).

melamine

[′mel·ə‚mēn]
(organic chemistry)
C3H6N4 A white crystalline compound that is slightly soluble in water, melts at 354°C and is a cyclic trimer of cyanamide; used to make melamine resins and in tanning of leather.

melamine

1. a colourless crystalline compound used in making synthetic resins; 2,4,6-triamino-1,3,5-triazine. Formula: C3H6N6
2. melamine resin or a material made from this resin
References in periodicals archive ?
However, to identify melamine in the samples, they were analyzed by immunosorbent assay (ELISA).
Furfural (25 mmol), malononitrile (25 mmol) and ethanol (2.5 mL) were mixed thoroughly, and then 0.25 mmol of melamine was added to a 50 mL round-bottomed flask.
"TarHong has seen overall growth in the melamine market with increased acceptance of melamine as a viable everyday material," said Jodi Riviera, vice president.
The home center where we bought our melamine panels sells small bags of screws--labeled "melamine screws"--that are packaged with white plastic caps to hide the screw heads.
BASF S.E., Hexion Inc., Ineos Melamines, Tembec Inc., Allnex Belgium S.A., Cytec Industries Inc., Georgia-Pacific LLC, AkzoNobel Chemicals, and Momentive Specialty Chemicals, among others, are some of the major players in the North America melamine formaldehyde market.
The OD data was computed by using BioTek(R) Gen5 software (BioTek(R), USA) for melamine quantification.
The main use of melamine is as a reactive intermediate for the manufacturing of MF resins.
terrigena in the presence of melamine showed that cyanuric acid was produced within an hour, peaked within 10 hours, and stayed steady thereafter.
A continuous low dose of melamine exposure may be associated with urinary system stones in children and adults, the study authors noted.
Total melamine levels in urine for 12 hours after eating the soup was 8.35 micrograms when the participants ate out of the melamine bowls versus about 1.3 micrograms when they ate out of ceramic bowls.
Results showed that gold/silver nano alloys have higher catalytic activity than nanoparticles made of pure gold or silver, and they can be used in the precise measurement of melamine at low concentrations in powder milk for infants.
As melamine content was increased at the same formaldehyde/urea (F/U) molar ratio, the solids content of the resin increased.