Melamine Resin history:
During the 1950-60 melamine formaldehyde tableware became fashionable. British Modern design Plastics increased. This changes was also threaten the position of ceramics. In conclusion of stain and scratch melamine resin, sales falls in the late 1960s. So eventually the material became largely restricted to the camping and nursery market. science was progressed. Scientists had discovered that formaldehyde bound is more tightly in MF than urea-formaldehyde. Therefore this can be-cause reducing emissions.
What is melamine resin?
melamine resin is the organic compound with the formula C3H6N6. This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. It contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred.
Polymerization and formulation of MF resin:
Polymerization (curing) of melamine to formaldehyde occurs in two stages. The first step of methylolation is the addition reaction of formaldehyde to melamine. It can be do in an aqueous phase under neutral or basic conditions. also be able under solvent medium.The second stage of curing mainly consists of 2 types of condensation reactions. The reaction cause to the formation methylene and methylene ether bridges that can be cured either thermally or under acidic/alkaline conditions. During curing, chain extension and crosslinking takes place to form an insoluble and infusible three-dimensional network. Stoichiometric ratio of melamine: formaldehyde was chosen as 1/3. The first step of methylolation was carried out in solvent THF. Resulted methylolmelamine was cured thermally at 195 °C for 45 min.
Melamine general uses:
Melamine can combined with formaldehyde and other agents to produce melamine resins. Such resins are characteristically durable thermosetting plastic used in high pressure decorative laminates such as Formica, melamine dinnerware, laminate flooring, and dry erase boards.
Melamine is part of the core structure for a number of drugs including almitrine, altretamine, cyromazine, ethylhexyl triazone, iscotrizinol, meladrazine, melarsomine, melarsoprol, tretamine, trinitrotriazine, and others.
Melamine Formaldehyde Laminating grade powder uses:
- high-pressure laminates like: Formica and Arborite, and of laminate flooring.
- Tile wall panels
- plastic laminate and overlay materials.
In the kitchen:
- Melamine-resin plate
- Kitchen services and plates.
Cabinet and furniture making:
Glut decorative paper which laminated under heat, pressure and pasted onto particle board.
Ready-to-assemble furniture, cabinets and decorations.
Melamine is also available in diverse sizes and thicknesses.
It contains a large number of colors and patterns.
Melamine formaldehyde properties:
MF forms via condensation of formaldehyde-melamine to give the hexa-hydroxymethyl derivative.
Upon heating in the presence of acid, this or similar hydroxymethylated species undergoes further condensation and cross-linking.
While linkages between the hetero-cycles include mono-di- polyethers. Micro-structure of material can analyze by NMR spectroscopy. Also cross-linking density of MF can control by co-condensation with bi-functional analogues of melamine, such as benzo_guanamine and aceto_guanamine.
Almost the sheets are heavy so when it cuts with conventional table saws, may be prone to chipping.