Novel biobased epoxy coatings for glass toughening applications

Three series of novel food contact approved and low-toxic coatings for glass toughening applications based on dicyandiamide and biobased epoxy compounds were successfully prepared and tested with different materials.

Novel biobased and food contact epoxy coatings. Source: -

Processability of the formulations in bulk and aqueous phase, and optimum materials were carefully investigated. The cure temperature of the epoxide-amine systems, namely epoxidised cardanol (NC514), diglycidyl ether of vanillin (DGEVA) and triglycidyl ether of phloroglucinol (TGEP), ranged from 160 to 250 °C, for which TGEP showed the highest reactivity.

Excellent adhesion without promotor

The developed materials exhibited excellent thermal stability and a wide range of glass transition temperature (Tg) was achieved, from 29 to 187 °C. The glass adhesion and mechanical properties were characterised by adhesion and mechanical ring test, respectively. The results revealed excellent glass adhesion properties without adhesion promotor addition and enhanced glass mechanical properties with all materials. These food contact and low-toxic materials are promising alternatives for DGEBA-based materials in widespread applications.

The study is published in: Progress in Organic Coatings, Volume 109, August 2017, Pages 1–8

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