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 ?
It was seen that the yield was 95% with 1 mol% melamine (Table-1, entry 3).
TarHong has seen overall growth in the melamine market with increased acceptance of melamine as a viable everyday material," said Jodi Riviera, vice president.
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.
terrigena in the presence of melamine showed that cyanuric acid was produced within an hour, peaked within 10 hours, and stayed steady thereafter.
He noted that both higher temperatures (from hot soups, for example) or more acidic foods can encourage melamine to contaminate food, especially in older or low-quality kitchenware.
We are confident that this new facility will be able to produce world class melamine based products to meet the growing demand in today's construction market.
Sequential injection assays are very rugged and efficient, making them an ideal platform for food analysis, including melamine and ammonia detection in food.
The researchers added concentrations of melamine at levels ranging from 0.
Produced mainly in Europe, North-East Asia, Asia-Pacific and North America, melamine is a versatile substance with a highly stable structure that can be easily moulded while warm.
inaugurated Tuesday a melamine plant, the largest in the Middle East and
Qafco's highquality urea will form the feedstock for the melamine plant.