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B. Szczepaniak, P. Penczek , J. Rejdych



The effect of heating of solid epoxy resins on their properties


Polimery 1998, No 11-12, 732


DOI: dx.doi.org/10.14314/polimery.1998.732


Summary

Triethanolamine-catalyzed polyaddition of various amounts of 2,2,-bis(4-hydroxyphenyl)propane (bisphenol A) to commercial medium-M epoxy resin Epidian 1 containing various amounts of ionic chlorine (0.0011—0.0301% m/m gave two series of epoxy resins, ŻE-M and ŻE-H, of high er molecular weights. To let down the resin from the reactor after synthesis requires the resins to be warmed up to make its viscosity lower. The effects of temperature (180–220°C) and heating time (up to 4 h) were studied in this conception. The epoxy value (Tables 2 and 5), softening temperature and color were studied in relation to the initial ionic chlorine content. The high er the initial ionic chlorine content and the higher is the temperature and the time of heating, the more pronounced are the changes. An inert gas applied during the synthesis and heating steps reduces the degree of darkening of the final products (Tables 8 and 9).


Keywords: solid epoxy resins, polyaddition,heating, epoxy value, softening temperature, color


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