BPA (bisfenol-A)'a alternatif yeni biyo-bazli epoksi-nanokompozit kaplamalarin elde edilmesi

Objective: The aim of this study is to synthesize new biobased epoxide-nanocomposite coatings as an alternative to BPA for aluminum surfaces. Material and Methods: The study was conducted in Aydin, Turkey, between January-December 2020. In the first step, epoxy functionalized tung oil (ETO) was prepared from the reaction of tung oil with glycidyl methacrylate (GMA) in the presence of phenothiazine as a catalyst via the Diels-Alder reaction. Subsequently, these new epoxide-nanocomposite coatings were successfully synthesized from the reaction of an epoxy functionalized tung oil (ETO) and two different polyether amines (Jeffamines T403 and ED900) as cross-linking agents, catalized by 2,4,6-tris (dimethylamino-methyl) phenol, premixed with graphene, fullerene, and carbon nanotubes (CNTs) as nanoparticles. Four different curing temperatures were applied. Results: Epoxide resin and the new nanocomposites were identified via 1H NMR, 13C NMR, IR, DSC and TGA analyses. While thermal stability of epoxide-amine nanocomposites are observed up to 420 °C according to TGA analysis, these cured films are displayed no glass transition points (Tgs) by DSC. The determination of the mechanical properties of the resulting nano coatings was accomplished by pendulum hardness, pencil hardness, cross-hatch adhesion, pull-off adhesion, impact and reverse impact resistance tests. Whereas, the epoxide-amine nanocomposite systems at 120 °C with CNT have the highest pendulum hardness values, there are no big differences in terms of the other mechanical properties. The all systems display good crosshatch adhesion (5B), pencil hardness (> 6H), pull-off adhesion (> 2 lb/in2), impact and reverse impact resistance (> 40) according to the ASTM standards. Conclusion: New epoxide-amine nanocomposite coatings exhibit excellent thermal stability. All the cured films showed good adhesion, hardness, and impact resistance properties. They can be used as alternative coatings instead of BPA based epoxy resins in various coating systems in food and beverage industries due to their excellent thermal stability and good mechanical properties. Keywords: Tung oil, Bio-based epoxide coatings, Nano composites, Jeffamine T403 and Jeffamine-ED900, BPA