Epoxy-amine adduct

After rinsing and dry-off, the primer is applied. In most modern plants this means electrodeposition of the primer (Section 14.1). The most widely used primers are cathodic. The body shell is made the cathode and current flows between it and inert anodes in the electropaint bath. The paint is formulated so that the resin is basic and, when neutralised with an acid such as lactic acid, becomes positively charged. The most widely used resins are epoxy-amine adducts ... 

Resin BADGE (X102, Epoxide equivalent mass = 830), approx 62 wt.-% Curing agent B, DICY/epoxy-amine adduct, 3.6wt.-%... 

For r < 1/3, no gel can be produced by epoxy-amine reactions. However, the homopolymerization of the epoxy excess (Eq. 3.37) may take place, finally leading to gelation. So, it is not convenient to use an epoxy excess to synthesize stable epoxy-amine prepolymers. Commercial epoxy-amine adducts are based on an amine excess. 

Epoxy-amine adducts are produced to provide curing agents that have reduced skin and eye irritation and better flexibility than unmodified amines. These epoxy amines are formed by the reaction of either a primary or secondary amine with an epoxy resin. They are more fully described in Chap. 5. 

Suitable curatives for the polysulfide-epoxy reaction include liquid aliphatic amines, liquid aliphatic amine adducts, solid amine adducts, liquid cycloaliphatic amines, liquid amide-amines, liquid aromatic amines, polyamides, and tertiary amines. Primary and secondary amines are preferred for thermal stability and low-temperature performance. Not all amines are completely compatible with polysulfide resins. The incompatible amines may require a three-part adhesive system. The liquid polysulfides are generally added to the liquid epoxy resin component because of possible compatibility problems. Optimum elevated-temperature performance is obtained with either an elevated-temperature cure or a postcure. 

Solid adducts Isolated amine products, in particular, offer advantages such as low colour, low free amine content and low irritation potential they also provide non-yellowing, bloom-free films with good chemical and solvent resistance Amine adducts solvent-based, two-pack coatings, e.g. primers, finishes and coal tar epoxy coatings... 

Multistage methods of synthesizing polyfunctional cyclic carbonates and hybrid nonisocyanate compositions using numerous epoxy-amine adducts are described in our work [19,20],... 

Carbon black Special Schwartz 4 Basic lead silicate China clay ASP 100 Talc Microtalc MP 15-38 Epoxy amine adduct JK512 Blocked isocyanate Lead soap (soluble) 6% Pb Lactic acid Demineralized water... 

Epoxy amine adduct JK512 is the reaction product of Epikote 1001 bisphenol epoxy resin with diamines and with a Cardura ElO/diamine adduct. Further details can be obtained from Shell Chemicals. 

Most of the amines, may irritate skin, possess a noxious odor or emit corrosive fumes. Hence they are mostly sold as modified variations with reduced vapor pressures and tendency to irritate. One approach to formulate amine cross-linkers with higher equivalent weight and lower toxic hazard is to make amine-adducts by reacting standard liquid bisphenol A epoxy with excess of a multifunctional amine. A variety of amines can be used to provide adducts with a range of cure rates and pot lives. A simple epoxy-amine adduct is shown below. In two of the superprimer formulations water-borne epoxy-amine adducts are used as the curing agents [11, 62]. 

Aqueous dispersion resin (epoxy amine isocyanate adduct) Extenders... 

Epoxy amine adduct Crosslinker Organic acid Organic solvent Deionized water... 

FDA epoxy. The welded coating is a two-component, amine adduct epoxy coating with excellent adhesion, flexibility, and chemical resistance. FDA and USDA excepted, it s an excellent lining for most dry products. 

Resinous adducts, 10 394 Resinous odor, 3 229t Resins. See also Epoxy resins Lacquer resins Novolac resins Phenolic resins Resole resins Thermoplastic resins acidic cation-exchange, 12 191 advanced materials, 1 693 antilipemic agents, 5 141 aromatic glycidyl amine, 10 372—373 chromatographic, 14 383-384 for coatings, 7 95-107 derived from furfuryl alcohol, 12 271— 272... 

Epoxy-alkanol amine adduct Reaction product of diethanol amine with DGEBA MW = ca. 580 f - 6 r = 1.7. 

BMI/amine Michael adduct resins may be further modified and blended with other thermosets or reactive diluents to achieve either specific end-use properties or processability. Epoxy resins are very suitable for the modification of BMI/primary amine adducts, because the secondary amine functionality in the aspartimide structure is a curative for the epoxy group. 

Heat resistant resin compositions based on BMI/aminophenol-Epoxy blends are achieved by reacting a BMI/p-aminophenol 1 1 adduct with epoxy resin (62). Both the secondary amine and phenol functionality may react with the epoxy resin and subsequently cure through an imidazole catalyst. Imidazole catalysts promote both the epoxy/phenol reaction and the anionic maleimide crosslinking. The formation of a 1 2 BMI/aminophenol adduct, as in Fig. 20, is claimed in a patent (63). The hydroxy terminated BMI/aminophenol adduct is an advantageous curing agent for epoxy resins when high temperature performance is desired. 

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