Kodi ubwino wa bisphenol A epoxy resin ndi wotani?
Utomoni wa epoxy wa Bisphenol A BPA ndi mtundu wa epoxy womwe umapangidwa kwambiri komanso umagwiritsidwa ntchito kwambiri. Umakhala wowonekera bwino kwambiri ndipo umapangidwa kuchokera ku bisphenol A BPA ndi epichlorohydrin pamaso pa sodium hydroxide. Mlingo wa polymerization, womwe umatchedwa "n", nthawi zambiri umakhala pakati pa 0 mpaka 25. Kutengera kulemera kwa mamolekyulu, ma epoxy resin amatha kugawidwa m'magulu osiyanasiyana. Kawirikawiri, ma epoxy resin otsika kulemera kwa mamolekyulu amakhala ndi mtengo wapakati wa "n" wochepera 2 ndi malo ofewa pansi pa 50°C, ndipo amatchedwa ma epoxy resin ofewa. Ma resin apakati kulemera kwa mamolekyulu ali ndi mtengo wa "n" pakati pa 2 ndi 5, ndi malo ofewa kuyambira 50°C mpaka 95°C. Ma resin okhala ndi mtengo wa "n" woposa 5 (malo ofewa pamwamba pa 100°C) amagawidwa m'magulu a ma resin okhala ndi kulemera kwakukulu kwa mamolekyulu.