Ambient temperature cured poly resins

Ambient-cure systems are often based on lower molecular-weight soHd epoxy resins cured with aUphatic polyamines or polyamides. Curing normally occurs at ambient temperatures with a working life (pot life) of 8—24 h, depending on the formulation. Epoxy—poly amine systems are typically used for maintenance coatings in oil refineries, petrochemical plants, and in many marine appHcations. Such coverings are appHed by spray or bmsh. These are used widely where water immersion is encountered, particularly in marine appHcations (see COATINGS, MARINE). 

Aliphatic poly amines. These are low-viscosity materials with high reactivity and fast cure at ambient temperatures. The basic reaction of aliphatic amines with epoxy resin is shown in Figure 2.7. 

The reaction between the terminal mercaptan and epoxide group proceeds very slowly at ambient temperature. However, the introduction of a basic material such as a tertiary amine greatly accelerates the cure. Poly sulfides are typically used at ratios of 1 1 or less with epoxy resins, and can be used as co-curing agents with aliphatic amines. Stoichiometric quantities of aliphatic amine and 25 to 50 parts by weight of polysulfide will react with 100 parts by weight of epoxy resin. 

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