Revestimentos de poliuretano obtidos a partir dos resíduos de macaúba da produção do biodiesel

Abstract

In Brazil, the macaúba has been studied as raw material for the production of biodiesel. This process generates large volumes of biomass residues that can be reused to obtain new products. In this work, polyurethane coatings were synthesized from biopolyols produced with the liquefaction of residual macauba biomass. The effect of the use of pure glycerol and crude glycerol as liquefying solvents and the effect of the biomass content were tested in order to obtain a higher yield of the liquefaction reactions and later on the coatings obtained. The PUs obtained with crude glycerol as part of the solvent showed lower yield in the liquefaction reactions, but higher thermal stability in the biopolyols obtained and greater resistance to corrosion. In the electrochemical impedance assays, greater corrosion protection was observed in the coating in which the biopolyol was coated with crude glycerol. However, the increase in the biomass content showed no effect on the corrosion resistance of the coatings.