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Melamine powder, also known as melamine,CAS 108-78-1, Molecular formula C3H6N6, the core component of melamine, is white melamine. It cannot burn, is insoluble in water, is slightly soluble in ethylene glycol, glycerol and ethanol, and is insoluble in ether, benzene and carbon tetrachloride. Store in a cool and ventilated warehouse. Keep away from kindling and heat sources. It shall be stored separately from oxidants and acids, and mixed storage shall not be allowed. The storage area shall be equipped with appropriate materials to contain leakage. It is the main raw material for manufacturing melamine formaldehyde resin. Melamine resin can be prepared by condensation polymerization with formaldehyde. It can be used in plastics and coating industry. It can also be used as anti folding and anti shrinkage treatment agent for textile fabrics. The modified resin can be used as metal coating with bright color, durability and good hardness. It can also be used for strong and heat-resistant decorative sheet, moisture-proof paper and gray leather tanning agent, adhesive of synthetic fireproof laminate, fixing agent or hardening agent of waterproof agent, etc. 582 melamine resin prepared from melamine, formaldehyde and butanol. As a leveling agent for solvent based polyurethane coatings, the effect is particularly good.
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Melting point |
> 300 °C ( lit. ) |
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Boiling point |
224.22 °C ( rough estimate ) |
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Density |
1.573 |
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Vapor density |
66.65 hPa ( 315 °C ) |
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Refractive index |
1.872 |
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Flash point |
> 110 ° C |
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Solubility water |
soluble25mg / mL |
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clear to slightly hazy |
colorless |
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Acidity coefficient( pKa ) |
5 ( at 25 °C ) |
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PH |
7-8 ( 32g / l, H2O, 20 ° C ) |
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Melamine powder, as an important organic chemical intermediate, has expanded its application fields from traditional industrial materials to high-end manufacturing, environmental protection technology, and emerging material research and development since its industrial production in the early 20th century. Despite the public attention caused by the 2008 food safety incident, a rational analysis of its technical characteristics and industrial value can help objectively understand the irreplaceability of this chemical substance in the modern industrial system.
Technological breakthroughs and market performance in core application areas
1. Melamine formaldehyde resin (MF resin) system
As the largest consumer area of melamine, MF resin has performance advantages reflected in the following dimensions:
Breakthrough in weather resistance: Through composite modification with phenolic resin and epoxy resin, MF resin has achieved a breakthrough in the field of outdoor decorative materials. The weather resistant MF resin decorative panel developed by an international building materials enterprise, after 2000 hours of UV accelerated aging testing, still has a color difference Δ E value controlled within 1.5, far exceeding traditional PVC decorative materials.
Environmental performance improvement: The new formaldehyde free MF resin technology uses isocyanates as crosslinking agents to control the release of free formaldehyde below 0.01mg/m ³, meeting the Japanese F ☆☆☆ environmental standards. This technology has been applied to the production of specialized boards for children's furniture, with an annual production capacity exceeding 500000 cubic meters.
Functional expansion: Nano scale MF resin microspheres have been industrialized in the field of electronic packaging. A semiconductor company used this material to prepare epoxy molding compounds, which reduced the thermal expansion coefficient to 12ppm/℃ and increased the thermal conductivity to 2.5W/(m · K), meeting the heat dissipation requirements of 5G communication devices.
2. High performance coating system
The technological innovation of melamine derivatives in the field of coatings is reflected in:
Automotive paint: The compounding technology of butanol etherified MF resin and acrylic resin enables the pencil hardness of automotive topcoat to reach 3H and the scratch resistance to be improved by 40%. After a German car company adopted this system, the warranty period for the body coating was extended to 10 years.
Industrial anti-corrosion: Melamine phosphate flame retardant coating has made breakthroughs in the field of marine engineering. Its salt spray test durability reaches 5000 hours, and the adhesion retention rate exceeds 95%. It has been applied to the steel structure protection of offshore wind power platforms.
Special functional coating: a self-cleaning coating developed with fluorinated MF resin, with a contact angle of up to 165 °, reducing dust accumulation on photovoltaic glass surfaces by 70%, and increasing annual power generation by 5% -8%.
3. Innovation in high-end molding materials
The technological iteration of melamine molding compounds is reflected in:
Medical devices: Medical grade MF molding materials have passed ISO 10993 biocompatibility certification, with a transmittance of 92% and an impact strength of 12kJ/m ² for the syringe housing. They have been applied in the manufacturing of high-end injection equipment.
Electronic appliances: A thermal conductive MF molding compound developed by a certain company, with a thermal conductivity coefficient increased to 1.8W/(m · K). After being used for LED lighting substrates, the lifespan of the lamp is extended by 30%, and the light decay rate is reduced to 3% per year.
Food contact materials: FDA certified MF tableware materials have a heat resistance temperature of up to 180 ℃, can withstand high temperature disinfection in microwave ovens, and have a heavy metal migration of less than 0.01mg/dm ².
Technological breakthroughs in emerging application fields
1. Flame retardant material system
The technological breakthrough of melamine based flame retardants is reflected in:
Polyurethane foam: melamine cyanurate (MCA) flame retardant can increase the oxygen index of polyurethane foam to 32%, and reduce the smoke density by 60%. After a certain household appliance enterprise adopted this technology, the flame retardant rating of the refrigerator insulation layer reached UL94 V-0 level.
Textile: Nano level melamine phosphate finishing agent increases the ultimate oxygen index of polyester fabric to 35%, and the flame retardant performance retention rate still reaches 90% after 50 water washes. Melamine powder has been applied to firefighting clothing and high-speed rail seat fabrics.
Engineering plastics: The compounding technology of melamine polyphosphate (MPP) and nylon 66 increases the ignition temperature (GWIT) of the material to 850 ℃, meeting the flame retardant requirements of new energy vehicle battery pack shells.
2. Adsorption and separation materials
The technological progress of melamine based adsorbent materials is reflected in:
Gas separation: The adsorption selectivity of mesoporous MF resin membrane for CO ₂ reaches 150, achieving a breakthrough in the field of carbon capture. After adopting this technology, a certain energy enterprise reduced the cost of CO ₂ capture in flue gas to $30/ton.
Water treatment: The adsorption capacity of melamine formaldehyde ethylenediamine copolymer microspheres for heavy metal ions reaches 300mg/g, achieving a reduction in cadmium ion concentration from 10mg/L to 0.01mg/L in electroplating wastewater treatment.
Chromatographic separation: The chiral MF resin stationary phase increases the enantiomer separation degree (Rs) to 2.5, achieving an optical purity of 99.5% in the purification of drug synthesis intermediates.
3. Application of new energy materials
The technological breakthroughs of melamine in the field of new energy include:
Solid electrolyte: Melamine based polyelectrolyte liquid increases the ion conductivity of solid-state batteries to 10 ⁻ S/cm, reduces the interface impedance to 50 Ω· cm ², and achieves a cycle life of over 2000 times.
Photovoltaic material: MF resin encapsulation film reduces the power attenuation rate of photovoltaic modules to 0.3% per year, achieving a 30-year power warranty in double-sided power generation modules.
Hydrogen energy storage: The melamine graphene composite material increases the hydrogen storage capacity to 6.5wt% and achieves a hydrogen absorption rate of 2wt%/min at 77K, meeting the requirements of on-board hydrogen storage systems.
Melamine powder, as an important organic chemical raw material, has a wide and significant range of applications in various fields such as plastic and resin industry, coating industry, building materials industry, leather industry, adhesive industry, flame retardant materials industry, building water reducer industry, formaldehyde cleaner industry, as well as chemical analysis and quality control. Although its illegal addition to food has caused serious food safety issues, we cannot ignore its enormous value in the industrial field. In the future, with the continuous advancement of technology and the increasing demand for environmental protection, the production and application of melamine will develop towards a greener, more efficient, and safer direction, making greater contributions to the development of various industries. At the same time, we also need to strengthen the supervision of the use of melamine, ensure its legal and safe application, and safeguard people's lives, health, and sustainable development of the environment.
Low pressure method for synthetic melamine powder:
After the fertilizer grade urea is melted in the storage tank, it is sprayed into the reactor through multiple nozzles.
Using fluidized alumina as a catalyst, circulating ammonia preheated to 400C is introduced into the reactor to maintain fluidization. The reaction pressure is atmospheric pressure or slightly higher than atmospheric pressure.
This reaction absorbs heat. Install heating coils inside the reactor, using molten salt as the heating medium, and maintain a reaction temperature of around 380℃.
The injected urea undergoes evaporation reaction to produce melamine, carbon dioxide, and ammonia, with a conversion rate of 95%. The reaction gas comes out from the top of the reactor and first enters the gas cooler.
The temperature after cooling is higher than the dew point of melamine. At this temperature, high boiling point by-products such as melamine and melamine crystallize and precipitate, and the catalyst powder is removed through a filter.
The filtered gas enters the sublimator, where the temperature is maintained between 170℃ and 200 ℃. The circulating gas is cooled to 140℃, and 98% of melamine precipitates in the form of granular crystals, while unconverted urea remains in the gas.
Melamine crystals and gas are separated using a cyclone separator, with a product purity of up to 99.9% and a separation efficiency of 99%.
The circulating gas from the cyclone separator enters the urea scrubber and is cooled to 140℃.
The unrecovered solid and gaseous melamine and unconverted urea in the circulating gas are washed and recovered in the urea scrubber.
Part of the gas generated by the scrubber serves as the medium for the sublimator, with a portion being pressurized and preheated before being circulated to the reactor, while the other portion can be returned to the urea plant.
Adhering into the basic principle of 'quality, assistance, effectiveness and growth', we have attained trusts and praises from domestic and worldwide client for Melamine Powder 1000kg Bags CAS 108-78-1 Industrial. We continue to broaden the consumer field to provide consumers with safer and better quality products. We pursue the synergistic development of high quality and high efficiency, and do things adhering to the way of thinking and behavior of mutual cooperation, mutual promotion and complementation, and harmonious development.