Curing agents melamine formaldehyde

A cement slurry additive consisting of methylcellulose, melamine-formaldehyde resin, and trioxane has been proposed for better bonding of cement to the casing string [20]. Bisphenol-A epoxide resins, with amine-based curing agents, sand filler, and a mixture of n-butanol and dimethyl benzene as a diluent, have been proposed as additives to increase adhesion properties of cement [572]. 

Coreactants, in microencapsulation, 16 444 Coreactive curing agents, 10 388-389, 392-411, 418. See also Curing agents amine functional, 10 392 401 carboxylic functional polyester and anhydride, 10 401—406 cyanate ester, 10 411 cyclic amidine, 10 410 isocyanate, 10 410 melamine-, urea-, and phenol-formaldehyde resins,... 

The type of polymer obtained depends on factors such as the pH and temperature of reaction, the ratio of melamine to formaldehyde, and the type of catalyst employed. For decorative laminates, melamine-formaldehyde is prepared by reacting melamine in stainless steel kettles under reflux, alkaline conditions with 37% to 46% formaldehyde in aqueous solution. The reaction temperatures used vary from 80 to 100°C and are maintained until the condensation has reached the desired end point—that is, reacted sufficiently but still water-soluble. The end point is checked by measurements of viscosity, cure time, and water tolerance. Depending on the type of laminate to be produced, other constituents (surfactants, plasticizers, release and anti-foam agents) normally are added to the base resin before impregnation of the surface papers. It is common practice also at this stage to adjust the pH by adding acid catalysts. 

Chem. Descrip. Butylated melamine-formaldehyde resin in n-butanol Uses Crosslinking agent for low temp, or ambient acid cured systems for kitchen cabinet and wood furniture finishes, metal coatings modifying resin for fast curing nitrocellulose coatings Properties APHA 30 max. color dens. 8.55-8.85 Ib/gal vise. (Gardner-Holdt) Y-Zj flash pt. (PMCC) 42 C 64.5-68.5% solids Resimene 7512 [Solutia]... 

Chem. Descrip. Etherified acrylated melamine/formaldehyde resin (62-68%) in tripropylene glycol diacrylate Uses Crosslinking agent in radiation-cure applies, such as polyester and epoxy acrylates, unsat. polyesters, aliphatic and aromatic urethane acrylates, and most acrylate monomer diluents imparts hardness and gloss, stain and chem. resist, to coatings, paper coatings Features Cured by free radical polymerization initiated by U V or thermal processing... 

Classification Butylated melamine-formaldehyde resin Uses Crosslinking agent for alkyd/polyester or acrylic resins, for use in solv.-borne coatings, acid curing wood finishes... 

Uses Retarding agent in rubber compounding in alkyd resins polyester resins paints plasticizers curing agent for heat-cured epoxy resins hardener for resins insecticides mfg. of phthaleins, phthalates, benzoic acid, dyes, chlorinated prods. laboratory reagent pharmaceutical intermediate polymerization control agent for melamine-formaldehyde resins for food pkg. retarder in food-contact rubber articles for repeated use... 

Pentaerythrityi triacryiate crosslinking agent, finishes fast-curing Melamine-formaldehyde resin, isobutyiated crosslinking agent, flexible PU foam slabstock Diethanolamine... 

Some other reported curing agents are quinone [81], chloranil [81], anhydroformaldehyde aniline [82], methylolureas and melamines [83], ethylenediamine-formaldehyde products, and paraformaldehyde. Resorcinol novolac resins can be cured with paraformaldehyde [84] and the mildly acid nature of resorcinol helps to catalyze the curing reaction [84]. Ammonium salts have also been reported as accelerators for the curing of phenolic resins [85]. 

Hazardous Decomp. Prods. CO, CO2, NOx, formaldehyde, isobutanol, melamine Storage Keep tightly closed store in cool dry place Uses Crosslinking agent for fast-curing finishes food-contact coatings, paper/paperboard... 

Resins with improved flame-retarding properties were obtained from BMI containing phosphorus cured with different kinds of agents (Tsai et al. 2009) or by blending a commercial phenolic epoxy resin containing phosphorous and melamine phenol formaldehyde novolac with various amounts of BMI (Chiang et al. 2013). 

---