International. Researchers from the Institut Charles Gerhardt Montpellier and the Laboratoire Charles Coulomb of the University of Montpellier (France) successfully prepared and tested three series of new approved and low-toxic food contact coatings for glass hardening applications based on dicyandiamide and bio-based epoxy compounds, with different materials.
The processability of the bulk and aqueous phase formulations, and the optimal materials were carefully investigated. The curing temperature of the epoxide-amine systems, i.e. epoxidized cardanol (NC514), vanillin diglycidylic ether (DGEVA) and floroglucinol triglycidyl ether (TGEP) ranged between 160 and 250ºC, for which the TGEP showed the highest reactivity.
The materials developed exhibited excellent thermal stability and a wide glass transition temperature range (Tg) was achieved, from 29 to 187 ° C. Glass adhesion and mechanical properties were characterized by adhesion and mechanical ring tests, respectively. The results revealed excellent adhesion properties to the glass without addition of the adhesion promoter and improved mechanical properties of the glass with all materials. These food contact and low-toxic materials are promising alternatives to DGEBA-based materials in widespread applications.
Source: http://www.sciencedirect.com
