International. Researchers developed a polyetherobically protected polyurethane coating based on mahua oil as a renewable resource.
The mahua (Madhuca indica) is a tree widely grown in tropical regions of India. The estimated annual production of it is higher compared to karanja oil and neem oil.
In the present work, mahua oil was reacted with the amine of dietanol resulting in the formation of mahua oil fat amide (MFA), which reacts additionally with bisphenol-A, forming mahua polyethetheramide resin (MPEA).
The structures of the polyethramide and intermediate synthesized resin were confirmed by spectroscopic methods and estimated physico-chemical properties such as acidity index, iodine index, saponification index, hydroxyl and acid value.
The prepared MPEA resin is converted into polyurethane coatings by reaction with diphenyl methylene diisocyanate (MDI) and toluene diisocyanate (TDI) with 1.1:1 NCO/OH radius. The thermal stability and coating properties of polyurethane coatings on steel panels and particleboard panels were investigated. The resin coating performance was tested by measuring gloss, scratch resistance, flexibility, scratches, pencil hardness, adhesion and chemical resistance using standard methods.
The results presented a better physical-mechanical performance, as well as corrosion resistance of the polyurethane coating obtained from polyethramide resin based on mahua oil.
