99% Melamine CAS 108-78-1

I. What is Melamine?

Melamine, also known as melamine or cyanuric acid, and designated 1,3,5-triazine-2,4,6-triamine by IUPAC, is a triazine-based nitrogen-containing heterocyclic organic compound and an important basic organic chemical intermediate. Its chemical formula is usually written as:

C3H6N6 (CAS No.: 108-78-1, molecular weight approximately 126.12)

It is a white monoclinic crystal at room temperature, almost odorless, with a melting point of about 354℃ (decomposes), sublimates at 300℃, and has a density of about 1.573 g/cm³. Melamine is slightly soluble in cold water (about 3 g/L at 20℃), soluble in hot water, glycerol, and pyridine, slightly soluble in hot ethanol, and insoluble in ether and benzene. Its nitrogen content is as high as 66.7%.

From a molecular structure perspective, melamine molecules consist of a triazine ring and three amino groups (-NH2), belonging to the class of mesicriazine compounds containing three primary amino groups. These three amino groups endow it with abundant hydrogen bond donor/acceptor and coordination capabilities, making it not only an important monomer in the resin industry but also a classic building block in supramolecular chemistry, coordination chemistry, and functional materials research—this "triazine skeleton + three amino groups" structure constitutes the functional basis for its applications in scientific research and materials science.

Chemically, melamine is stable at room temperature, but decomposes upon heating or combustion, producing toxic fumes containing hydrogen cyanide, nitrogen oxides, and ammonia. Its powder, when mixed with air, may cause a dust explosion; therefore, precautions must be taken to prevent explosions. It should be stored in a dry, sealed container, away from sources of ignition.

Non-industrial grade melamine refers to products intended for research and consumer applications, primarily including reagent-grade specifications. Compared to industrial grade, non-industrial grade products place greater emphasis on the following indicators:

Purity and Impurity Control

Reagent-grade reagents generally require a main content of over 99% and control of impurities such as ash and iron to ensure the accuracy of experimental results.

Moisture

Excessive moisture content can affect the synthesis reaction and experimental stability, and must be kept at a low level.

Ash

Ash content reflects the content of inorganic impurities, which affects the quality of experiments and materials research, and must meet specifications.

Color

The crystals should be white and pure in color; abnormal color often indicates excessive impurities.

II. What are the uses of Melamine?

1. Melamine-formaldehyde resin (core application)

Melamine-formaldehyde resin (MF), formed by the condensation polymerization of melamine and formaldehyde, is the most important application of melamine. The resin has excellent properties such as high hardness, heat resistance, water resistance, wear resistance, and self-extinguishing properties, and is widely used in melamine tableware, decorative boards (melamine boards), laminates, whiteboards, kitchenware, and electrical parts.

2. Amino resin coatings

Melamine-formaldehyde resin is used as a crosslinking agent for amino baking coatings. When combined with alkyd resins, polyester resins, etc., it imparts high hardness, high gloss, and weather resistance to the coating, and is widely used in high-temperature baking coatings for home appliances, automobiles, and metal products.

3. Wood adhesives

Melamine is used in wood adhesives such as modified urea-formaldehyde resin to significantly improve bonding strength, water resistance, and weather resistance, and is applied in the production of engineered wood products such as plywood, particleboard, and blockboard.

4. Flame retardants

Melamine is an important nitrogen-based flame retardant. When heated, it decomposes to release inert gases such as nitrogen, which dilute flammable gases. Its derivatives (such as melamine cyanurate MCA) have a synergistic effect when combined with phosphorus-based flame retardants, and are used in flame-retardant plastics, rubber, coatings and textiles.

5. Concrete water-reducing agent

Sulfonated melamine formaldehyde (SMF) is a kind of efficient water reducing agent, which can significantly decrease the water consumption of concrete, enhance the fluidity and strength, and is widely used for high strength concrete, pumped concrete and large volume concrete projects.

6. Wet strength agent for papermaking

Melamine formaldehyde resin is used as a wet strength agent in papermaking for maintaining the strength of paper in a wet state. It is used to make speciality papers like filter paper, food packaging paper and moisture-proof paper.

7. Textile and leather finishing agents

Melamine resin is used as a finishing agent for textiles to prevent wrinkling and shrinkage and as a tanning and treatment agent for leather, improving the dimensional stability and feel of fabrics and leather.

8. Scientific research and laboratory applications (reagent grade, core applications)

Melamine is a commonly used triazine reagent in the laboratory. Its three amino groups and triazine ring make it an important building block in supramolecular chemistry, coordination chemistry and functional materials research, and it is used in cutting-edge research such as hydrogen bond networks, metal-organic frameworks (MOFs), covalent organic frameworks (COFs) and flame-retardant new materials.

9. Crafts and DIY Resin Making (Consumer Grade)

Melamine-formaldehyde resin can be used to make resin crafts and decorations. Craft enthusiasts can use resin molding to make ornaments, jewelry and cultural and creative products, but attention must be paid to the protection against formaldehyde and melamine in the resin.

10. Customized Fine Chemicals

Melamine is a raw material for the synthesis of triazine-based fine chemicals. It can be used to synthesize functional chemicals such as flame retardants, crosslinking agents, and surfactants, serving the research and development of fine chemicals.

It should be noted that non-industrial grade specifications do not mean "risk-free": melamine is nephrotoxic and is strictly prohibited from use in food and feed. When using reagent-grade products in experiments, laboratory safety regulations should be followed to avoid dust inhalation and skin contact. When making resin crafts, attention should also be paid to the protection against volatile substances such as formaldehyde.

Summarize

Melamine, a white crystalline triazine nitrogen-containing compound, is an important monomer in the resin industry and a classic building block in supramolecular and functional materials research. In daily life, we indirectly encounter it through melamine tableware, furniture trim panels, appliance and automotive coatings, flame retardants, and concrete water-reducing agents. In non-industrial applications, reagent-grade melamine is widely used in scientific research and laboratories, functional materials research, resin crafts production, teaching experiments, and the customization of fine chemicals. It is crucial to emphasize that melamine is nephrotoxic and strictly prohibited from use in food and animal feed; it must always be strictly kept outside the food chain.