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Melamine 99.8%, mainly used in daily life. Its content exceeds 99%, and it can react with strong oxidants and strong acids. White monoclinic crystal. A small amount is soluble in water, ethylene glycol, glycerin and pyridine. Slightly soluble in ethanol, insoluble in ether, benzene and carbon tetrachloride. Heating sublimation, fast heating decomposition. Non flammable. Low toxicity. 2. Low toxicity, no irritation. The rats inhaled 200 mg/m3 dust for 2 hours, and no toxic symptoms were found. Cyanide may be decomposed at high temperature, so high temperature should be avoided. It (108-78-1) is a basic organic chemical intermediate product with a wide range of uses. It is mainly used as raw material for melamine formaldehyde resin (MF) production.
The market demand is huge and there are many manufacturers. It is prepared by the reaction of dicyandiamide and ammonia in methanol solvent at 200 ℃.
This method requires 1180kg dicyandiamide (98%) and 30kg liquid ammonia per ton of product. Compared with this method, urea method has price cost and is widely used at present.
Urea takes ammonia as carrier and silica gel as catalyst. It boils at 380-400 ℃. First, it decomposes into cyanic acid and further condenses into it. The resulting melamine gas is cooled and captured to obtain a crude product, which is then dissolved to remove impurities and recrystallize to obtain a finished product. About 3800Kg urea and 500kg liquid ammonia are consumed per ton of product produced by urea method.
|
CF |
C6H12O2 |
|
EM |
116 |
|
MW |
116 |
|
m/z |
116 (100.0%), 117 (6.5%) |
|
EA |
C, 62.04; H, 10.41; O, 27.55 |
Melamine 99.8% is a triazine nitrogen-containing heterocyclic organic compound. In the industrial field, melamine has a wide range of applications and is often used as a chemical raw material to manufacture melamine formaldehyde resin, which is then applied in various industries such as plastics, coatings, water reducers, papermaking, adhesives, textiles, leather, electrical appliances, pharmaceuticals, flame retardants, etc. The following are its uses:
Ways and hazards of migration to food
In daily life, food contact materials made of melamine formaldehyde resin, such as melamine tableware (imitation porcelain tableware), are one of the main ways for melamine to migrate into food. Melamine tableware is processed by polymerization of melamine and formaldehyde, and molded by compression molding. It has the advantages of beautiful appearance, lightweight use, and not easy to break. It is commonly used in homes, schools, kindergartens, unit canteens, restaurants, and other places.
However, when melamine tableware is exposed to light, heating, acid, or other improper use, its surface structure will be damaged, causing residual or decomposed melamine and formaldehyde inside to migrate to the food in contact with it. For example, using melamine tableware to heat food in a microwave or oven, or using high-temperature disinfection, may increase the migration of melamine.
Food packaging materials
Some food packaging materials may also contain melamine. If the quality of packaging materials is not up to standard, or if they are affected by environmental factors such as high temperature and humidity during storage and transportation, melamine may migrate from packaging materials to food. For example, some inferior plastic packaging materials may have used raw materials or additives containing melamine in the production process, which can release melamine into food when in contact with it.
In the process of food processing, the use of additives or equipment containing melamine may also lead to the migration of melamine into food. Although this situation is relatively rare, once it occurs, it may contaminate a large amount of food and cause serious food safety issues. For example, some illegal businesses illegally add melamine as a "protein essence" for protein content testing during food processing in order to reduce costs. This behavior seriously violates food safety regulations and poses a great threat to consumers' health.
Melamine is metabolized slowly in the human body, and long-term intake of food containing migrating melamine can lead to the gradual accumulation of melamine in the body. This chronic accumulation of toxicity may unknowingly cause damage to multiple organs and systems in the human body, increasing the risk of various diseases. For example, long-term intake of food containing melamine may lead to a gradual decline in kidney function and trigger diseases such as chronic kidney disease. After melamine migrates into food, it may interact with other components in the food, producing new harmful substances. These new harmful substances may cause more serious harm to human health.
For example, when melamine binds to certain proteins or amino acids in food, it may form complex compounds that are difficult for the human body to digest, affecting nutrient absorption and leading to problems such as malnutrition. The migration of melamine into food not only poses a threat to consumers' physical health, but also has a negative impact on their psychology. Consumers will have concerns and distrust towards food safety, reduce their willingness to purchase related foods, and affect the normal development of the food industry. This psychological impact may last for a long time and requires active measures from the industry and regulatory authorities to rebuild consumer trust.
The use of aerospace
As a component of coating materials
In the aerospace field, aircraft and spacecraft need to face various harsh environmental conditions, such as high temperature, oxidation, corrosion, etc. Melamine can be used as one of the components of coating materials, working together with other substances to improve the heat resistance and corrosion resistance of coatings. For example, adding melamine to the surface coating of some aerospace engine components can form a dense protective film, preventing high-temperature gases and corrosive media from corroding the component substrate and extending its service life.
Melamine can also improve the mechanical properties of coatings, such as hardness and adhesion. Coatings with good mechanical properties can better protect aerospace components from scratches, wear, and other damages during use. For example, the application of melamine in the surface coating of aircraft fuselage can increase the hardness of the coating, making it resistant to the impact of particles such as dust and hail during flight, while enhancing the adhesion between the coating and the fuselage substrate to avoid coating detachment.
The aerospace industry has extremely high requirements for flame retardancy, as the consequences of a fire would be unimaginable. Melamine has flame retardancy and can be used as one of the components of flame retardant coatings. It can decompose at high temperatures, releasing non combustible gases, diluting the concentration of combustible gases, and forming a carbonized layer to prevent the spread of flames. For example, adding melamine to the surface coating of aircraft cabin interiors, cables, and other components can improve their flame retardancy and ensure the safety of passengers and the aircraft.
In modern aerospace technology, stealth performance is crucial for military aircraft and spacecraft. Melamine can be combined with other substances to manufacture invisible coatings. Invisible coatings can absorb or scatter radar waves, reducing the radar reflection cross-sectional area of aircraft and spacecraft, making them difficult to detect by enemy radar. For example, in the surface coating of some military aircraft, the application of melamine can help achieve stealth function, improve the aircraft's survivability and combat effectiveness.
Nano foam, also known as melamine foam and melamine foam, is a new type of sound absorption, heat insulation and thermal insulation nano material made from Pure Melamine. Since its successful development in the 1990s, nano foam has attracted attention from various industries due to its unique properties and wide range of applications. Here is its manufacturing information:
Core raw material - Pure Melamine
Pure Melamine, The chemical formula is C ∝ H ₆ N ₆, which is a key raw material for producing nano foam. Melamine has a unique chemical structure, which provides the basis for the formation of nano foam. Its stable chemical properties enable the nano foam to maintain relatively stable performance during subsequent use, making it less prone to chemical reactions and deterioration.
Auxiliary raw materials
Foaming agent: Foaming agent plays a crucial role in the production of nano foam. It can decompose to produce gas under heating or other conditions, which makes melamine resin expand to form foam structure. Different foaming agents have different decomposition temperatures and gas generation amounts, which can affect the pore structure and density of nano foam. For example, some chemical foaming agents decompose at specific temperatures, producing gases such as nitrogen and carbon dioxide, which form bubbles in the resin, giving the foam a porous structure.
Surfactant: Surfactants can reduce the surface tension of liquids, which helps to form and stabilize bubbles during the foaming process. It can evenly distribute bubbles in the resin, prevent the merging and rupture of bubbles, and ensure that the nano foam has a uniform pore structure. At the same time, surfactants can also improve the composite performance of foam with other materials and enhance the processing performance of foam.
Curing agent: Curing agent is used to promote the curing reaction of melamine resin, forming a stable cross-linked structure of foam. Different curing agents have different curing speeds and effects, which can affect the physical and chemical properties of foam. Suitable curing agents can form a good three-dimensional network structure during the curing process of foam, improving its strength and heat resistance.
Opening agent: The function of the opening agent is to increase the opening rate of the foam, making the foam have better breathability and sound absorption performance. By adding pore opening agents, the closed cell structure of foam can be disrupted, forming more connected pores, thereby improving the absorption capacity of foam for sound waves.
Production process
Mix Melamine 99.8% with other auxiliary ingredients in a certain formula ratio. During the mixing process, it is necessary to ensure that various raw materials are evenly dispersed to ensure the consistency of foam performance. The mixing process is usually carried out in specific mixing equipment, such as high-speed mixers. The speed and mixing time of the mixer need to be precisely controlled according to the properties of the raw materials and the requirements of the formula to ensure the best mixing effect.
Put the mixed raw materials into a foaming mold, and heat the foaming agent to decompose and produce gas, thereby expanding and foaming the resin. The heating temperature and time have a significant impact on the pore structure and density of foam. If the heating temperature is too high or the time is too long, it may cause the foam to expand excessively, the pore structure to be too large, and the density to decrease, thereby affecting the strength and sound absorption performance of the foam; On the contrary, if the heating temperature is too low or the time is too short, the foam may not be fully foamed, resulting in uneven pore structure and decreased performance. The design of foam molds is also a crucial step. The shape and size of the mold determine the final shape and size of the foam. Meanwhile, the material and surface treatment of the mold can also affect the surface quality and demolding performance of the foam. Reasonable mold design can ensure uniform expansion of foam during the foaming process, forming good shape and dimensional accuracy.
After foaming is completed, the foam needs to be cured to form a stable cross-linked structure. The curing process is usually carried out under certain temperature and time conditions, and the selection of curing temperature and time needs to be optimized according to the formula and performance requirements of the foam. During the curing process, chemical reactions occur between resin molecules to form a three-dimensional network structure, thereby improving the strength, hardness, and heat resistance of foam.
After solidification and shaping, the foam still needs a series of post-treatment processes to improve its performance and appearance quality. Cut the foam into the desired shape and size according to different application requirements. The cutting process can be carried out using methods such as mechanical cutting and laser cutting. Mechanical cutting has lower costs, but relatively lower accuracy; Laser cutting has high precision, but the cost is relatively high. Treat the surface of foam, such as polishing, coating, etc. Polishing can remove burrs and unevenness on the surface of foam, improving surface smoothness; Coating treatment can increase the waterproof and fireproof properties of foam, and broaden its application range.
adverse reaction
Melamine 99.8% , with the chemical formula C₃H₆N₆, is a nitrogen-containing heterocyclic organic compound. Due to its high nitrogen content (about 66%), it was illegally used as a food additive to inflate protein content, leading to the 2008 Chinese tainted milk powder incident and causing health damage to thousands of infants and young children. Industrial grade melamine (with a purity of 99.8%) is mainly used in the production of resins, coatings, flame retardants, etc., but its toxicity risk cannot be ignored.
Acute toxicity
Inhalation toxicity:
Animal experiments have shown that rats inhaling melamine dust with a concentration of 200 mg/m ³ for 2 consecutive hours did not exhibit significant toxic symptoms. However, long-term or high concentration exposure (such as excessive dust concentration in occupational environments) may cause respiratory irritation, manifested as coughing, shortness of breath, or alveolar inflammation. The mechanism may be related to the deposition of dust in the alveoli, which can cause mechanical damage or oxidative stress.
Oral toxicity:
Melamine has low oral toxicity, but long-term high intake (such as through contaminated food) can lead to delayed weight gain, central nervous system suppression (such as drowsiness, coma), and renal dysfunction. In animal experiments, there is limited data on oral LD50 (median lethal dose) in rats, but clinical cases have shown that infants and young children may experience acute kidney failure symptoms such as oliguria and anuria in the short term after consuming melamine containing milk powder.
Skin and eye irritation:
Melamine powder is irritating to the skin and eyes. Contact may cause erythema, edema, or corneal damage, especially in humid environments, and the ammonia produced by the hydrolysis of melamine can exacerbate irritation reactions.
Chronic toxicity
Damage to the urinary system:
The metabolites of melamine (such as cyanuric acid) deposit in the kidneys, forming insoluble crystals that block renal tubules, leading to kidney stones, hydronephrosis, and even kidney failure. Clinical studies have shown that infants and young children who consume foods containing melamine for a long time have a significantly increased incidence of urinary system stones, manifested as hematuria, difficulty urinating, and recurrent urinary tract infections.
Liver and metabolic disorders:
Animal experiments have shown that melamine may cause hepatic steatosis or abnormal enzyme activity, and the mechanism may be related to oxidative stress or lipid metabolism disorders. Long term exposure may result in abnormal liver function indicators (such as elevated ALT and AST), but clinical relevance still needs further verification.
Reproductive and developmental toxicity:
Animal experiments have shown that melamine may affect reproductive system function, such as reducing sperm motility or causing ovarian damage. The impact on fetal development is still controversial, but some studies suggest that exposure during pregnancy may increase the risk of fetal urinary system abnormalities.
Frequently Asked Questions
Why is melamine harmful?
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Melamine has low oral acute toxicity but excessive exposure in animals causes renal stones. When consumed by human beings, babies and children are affected the most because of their dependence for nutrition, compounded by immaturity of their organs, which renders them vulnerable to chemical damage.
What is melamine used for?
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Melamine and its salts are used as fire-retardant additives in paints, plastics, and paper. A melamine fiber, Basofil, has low thermal conductivity, excellent flame resistance and is self-extinguishing; this makes it useful for flame-resistant protective clothing, either alone or as a blend with other fibres.
Is melamine toxic when heated?
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Melamine is generally safe for serving foods up to about 160°F (71°C). It should not be used for cooking or reheating, especially in microwaves, as higher temperatures can cause it to break down and leach chemicals. Always follow manufacturer guidelines to ensure safe use.
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