Polimery 1993, No 4-5, 175
It was found that elementary sulphur (S) dissolved in epoxy resin (EP resin) considerably accelerates the process of crosslinking of the resin with polyamines. Efficiency of S depends on the basicity of the polyamine hardener and on the type of thinner. In alkaline medium, S is a source of thiirane groups with considerable reactivity towards polyamines. The accelerating effect of S is comparable to the accelerating action of salicylic acid (SA). A S + SA mixture has a synergetic effect. Acceleration of the curing reaction of EP resin by the addition of a system composed of 1% S and 1% SA was observed at temperature as low as 5°C. This acceleration with S or with S + SA did not cause any essential changes in properties of the cured EP resins.
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