What is MF Resin?
Generally the commercial production of MF Resin is in fact similar to the production of UF resin. The specifics of the production of the Melamine Resin system depend on the application for which the resin is intended.
Intended resins for paper or fibers glut modified with other compounds. Such as acetoguonamine and E-caprolactame. These modifying compounds are usually added at around 3–5% (w/w) and decrease the cross linking in the cured resin. Therefor it makes resin less brittle. In the manufacture of wood panel products, the additives are not usually needed. Sugars have been used as modifiers in the wood panel adhesive industry but these are added to lessen the cost of the resin.
However, the addition of sugars means that with age the resin will yellow and crack and has a detrimental effect on long-term resin properties. MF Resin intended for use on the wood panels industry are generally designed with a higher viscosity than those intended for the infusion of paper, in order to prevent over penetration into the wood substrate.
MF Resin properties:
Resins with good penetration can be created in several ways; a resin with a low level of condensation and high methylol group content will create a low viscosity resin with fast curing rate. A resin with a low level of condensation and a melamine to formaldehyde ratio of 1:1.8 to 2.0 will give the desired result.
A second approach to creating the resin is to form a resin with a higher degree of condensation and a lower methylol group content, and add a second batch of melamine to the mix (usually giving a total melamine content of 3–5%) towards the end of the reaction. Typical total melamine formaldehyde ratios are in the region of 1:1.5 to 1:1.7 for this system.
Melamine Resin Uses:
Melamine formaldehyde (MF Resin) are widely used in applications in which the product may come in to contact with water, including kitchenware, laminates, overlay materials, particleboards, and floor tiles. This is due to its high resistance to water attack which distinguishes it from UF resins. Melamine is also used in the manufacture of flame-resistant materials. These include textiles such as upholstery, firemen uniforms, thermal liners, and heat resistant gloves and aprons. Melamine and its salts are also used as fire-retardant additives in paints, plastics, and paper.
Melamine foam is a special form of melamine resin. It finds uses as an insulating and soundproofing material and more recently as a cleaning abrasive. The foam products can be used for removing scuffs and dirt from a wide range of surfaces. Furthermore, some filters are made out of porous melamine. These filters can be used in hot environments, and are extremely efficient.
Sulfonated melamine formaldehyde (SMF) is a chemical used as a super-plasticizer for making high-resistance concrete. It uses to reduce the water content in concrete while increasing fluidity and workability of it during handling and pouring. The result is a concrete with a lower porosity and a higher mechanical strength, which exhibits an improved resistance to aggressive environments and has, therefore, a longer lifetime.
Mf other applications:
One of the most important applications of melamine is the fabrication of particleboards. It is often blended with UF resins to improve the scratch and flame resistance and also acts as a flame retardant. Melamine is also used to saturate decorative paper, which is then laminated under heat and pressure, fusing the laminate onto particleboards. The melamine composite boards and laminates are a cost effective alternative to more expensive surfaces. The main advantage is reduced material costs, and quick turn-around times, resulting in reduced labor costs.
(Etherified) hexamethylolmelamine and melamine resins are also used to crosslink many industrial thermosetting coatings. They readily react with primary and secondary hydroxyl functional polymers, resulting in three-dimensional thermoset polymer networks. They are used to crosslink with alkyd, epoxy, acrylic and polyester resins, mainly used in surface coatings. There are many types of melamine coatings, varying from very slow to very fast curing.