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Amine-Functional Curatives for Low Temperature Cure Epoxy Coatings An active area of technology development at Resolution Performance Products LLC (RPPLLC)is the design of improved epoxy/amine binder systems for low temperature cure coatings.Low temperature cure epoxy coatings allow applicators to extend the painting season and to increase scheduling flexibility because coating application can continue when the temperature falls below 50 ¡ãF. This paper begins with a basic overview of the curing agent technologies used for low temperature applications. The performance of several commercial low temperature curatives with standard liquid epoxy resin are studied in this work. Differential scanning calorimetry is used to monitor the cure rate at 40 ¡ãF over a 14 day period. The coatings performance in clear varnish formulations is presented; cured at standard ambient conditions (77 ¡ãF 55% R.H.) and at sub-ambient, high humidity conditions (50 ¡ãF 90% R.H. and 40 ¡ãF 80% R.H.). The study concludes with evaluation of a new approach to low temperature cure epoxy coatings. This approach uses low temperature curatives in combination with polyacrylated epoxy resins. The results show that these new binder systems give improved clarity, blush resistance and cure development under low temperature, high humidity conditions. |
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2013-07-21 10:18:14, 473.57 K
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