High Solid Alkyd Resin Coatings based on Soya Beans Fatty Acid with Improved Coating Performance; The Beneficial Effects of Fatty Acid Functionalized Carbon Nanotubes on their Water-Proofing and Biodegradability

Abstract The environmental influence of the coating industry has led to the progress of lots of environmentally friendly products based on high solid alkyds. The problem of increasing viscosity in high solid coatings has tried to resolve by decreasing their molecular weight. However, this results in resins with inadequate properties. In our paper, we have tried to avoid this issue without changes in the chemistry of resin by the assisting of modified nano-materials in coatings. Thus a new medium oil alkyd resin based on soya beans fatty acid was synthesized. Then two differently surface modified Carbon nanotubes (CNTs) functionalized with renewable soya-bean & stearic fatty acids were incorporated into the alkyd resin. Different properties of these nanocomposites including heat resistance, drying time, gel content, hardness, chemical resistance, contact angle, hydrophobicity and biodegradability were improved comparing with the pristine resin. Coatings prepared from the modified resins dried quickly, were waterproof and their characteristic were satisfactory for decorative applications. Their improved properties designate effective reinforcement of these high solid resins using bio-based modified CNTs. Interestingly in spite of their good hydrophobicity and improved waterproofness they showed increased hydrolyze-ability and biodegradability because of the presence of bio-based modified CNTs.