Epoxy adhesives hardening agents for

Hardeners used in curing bisphenol-A epoxy resins, the type most commonly used in adhesives, include the following  

Boron trifluoride hardeners Boron trifluoride monoethylamine melts at 95 °C and is used in one-part adhesives 

Misceiianeous curing agents The most important is dieyandiamide, used frequently in metal bonding. This material melts at about 200 °C and is nonreaetive at room temperature, and so it is eonvenient for use in a one-package adhesive in the form of a powder or rod 

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The original two-part epoxy adhesives consisted of DGEBA as one part and a hardener as the other part. Thus, the choice of hardener is important in that it forms such a significant portion of the final adhesive. In Skeist s first book on adhesives, he lists only 12 curing agents for epoxy resins. In the present day, there are virtually hundreds of different curing agents for epoxy resins. 

Chem. Descrip. Isophorone diamine CAS 2855-13-2 EINECS/ELINCS 220-666-8 Uses Curing agent, hardener for epoxies in coatings, adhesives, castings and composites... 

Precaution Combustible corrosive to copper Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of NOx Uses Epoxy curing agent/hardener intermediate for pharmaceuticals, anthelmintics, surfactants, synthetic fibers, corrosion inhibitors, asphalt additives, emulsion breakers, emulsifiers, textile chems. used for civil engineering, coatings, adhesives, grouts, casting and elec, encapsulation corrosion inhibitor in petrol, prod. solvent Manuf./Distrib. Akzo Nobel http //www.akzonobel.com] Aldrich http //www.sigma-aldrich.com] Alfa Aesar http //www.alfa.com] Alkyl Amines Chems. Ltd http //www.alkylamines.com] BASF AG http //www.basf.de... 

Uses Antioxidant stabilizer catalyst intermediate R.T. epoxy curing agent activator for epoxy resins cured with wide variety of hardener types incl. polyamide, amidoamines, polymercaptans, and anhydrides for coatings, adhesives, castings, potting, encapsulation Manuf./Distrib. ChemService http //www.chemservice.com, Sigma Trade Name Synonyms Ancamine 1110 [Air Prods./Perf. Chems. http //WWW. airproducts. com]... 

One-part epoxy adhesives include solvent-free liquid resins, solutions in solvent, liquid resin pastes, fusible powders, sticks, pellets and paste, supported and unsupported films, and preformed shapes to fit a particular joint. Two-part epoxy adhesives are usually comprised of the resin and the curing agent, which are mixed just prior to use. The components may be liquids, putties, or liquid and hardener powder. They may also contain plasticizers, reactive diluents, fillers, and resinous modifiers. The processing conditions are determined by the curing agent employed. In general, two-part systems are mixed, applied within the recommended pot life (a few minutes to several hours), and cured at room temperature for up to 24 hours, or at elevated temperatures to reduce the cure time. Typical cure conditions range from 3 hours at 60°C to 20 minutes at 100 C. ... 

Crosslinkers and Accelerators. Besides the polymers themselves, changes and improvements are taking place in curing agents, hardeners, catalysts, and polymer modifiers. For example, if epoxy adhesives with improved heat resistance are needed, the hardeners can be aromatic anhydrides and amines such as benzophenone tetracarboxylic dianhydride, py-romellitic dianhydride, diaminodiphenyl sul-fone. To enhance curing speed, epoxy systems utilize mercaptan hardeners, while acrylic monomer/polymer blends avail themselves of amine/aldehyde catalysts with benzosulfimide (saccharin) accelerators. Radiation-curing systems for today and tomorrow utilize both visible light and laser beams. 

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