Melamine phenolic resins

As already mentioned in Section 24.2.4 melamine is now widely used in conjunction with urea (and formaldehyde) to produce adhesives of good strength, reactivity and water resistance but with low ratios of formaldehyde to amine (i.e. urea and melamine). 

Melamine-formaldehyde condensates are also useful in textile finishing. For example, they are useful agents for permanent glazing, rot proofing, wool shrinkage control and, in conjunction with phosphorus compounds, flameproofing. 

Compositions containing water-repellent constituents such as stearamide may also improve water repellency. 

Modified melamine resins are also employed commercially. Alkylated resins analogous to the alkylated urea-formaldehyde resins provide superior coatings but are more expensive than the urea-based products. 

Paper with enhanced wet-strength may be obtained by incorporating melamine resin acid colloid into the pulp. Melamine resin acid colloid is obtained by dissolving a lightly condensed melamine resin or trihydroxymethylmelamine, which are both normally basic in nature, in dilute hydrochloric acid. Further condensation occurs in solution and eventually a colloidal solution is formed in which the particles have a positive charge. Careful control over the constitution of the colloidal solution must be exercised in order to obtain products of maximum stability. 

---

Plastics Nitrocellulose, urea-formaldehyde, melamine, phenolic resins... 

Melopas . [Ciba-Geigy GmbH] Melamine-formaldehyde or melamine-phenolic resins molding conqxls. 

Uses Binder, film-former in paints (printed circuit board coatings, coil, container, conosion-protection, marine, metal, plastics, sealers, tarp, wood varnishes), printing inks (screen printing), primers (adhesion pro-motion/corrosion protection), ceramic compds., sealers, heat-sealable lacquers, two-pack paints, resinous/polymeric food-contact coatings reactive resin in two-pack systems, e.g., crosslinked with melamine/phenolic resins... 

Solution monomer dispersed in solvent with soluble catalyst free radical, ionic, Zeigler Nichols thermosets, acrylics, PVAlc, PVC, polybutadiene, polypropylene, melamine phenolic resins, polyisoprene, polycarbonate, chlorinated polyesters glass or s/s STR (2-8 kW/m mixen heat transfer area = 1-4 m /m depending on the volume of the reactor with small area associated with large volumes). 

Melamine/phenolic resin n. A mixture of melamine- and phenol-formaldehyde resins that combines the dimensional stability and ease of molding of phenolics with the wider range of colorability of the melamine resins. 

A few examples of thermosetting materials are epoxies often used for mold making and tools. In fact, we will be discussing the use of aluminum filled epoxy to make molds later in the book. Melamine, (Dishes are often made of melamine). Phenol resins are commonly used in higher temperature and strength applications such as home appliance handles and parts. Other uses for phenol resins would be distributor caps, coil tops, phone housings and tool housings to name a few. 

---