13. MAS International European Conference on Mathematics, Engineering, Faryab, Afganistan, 23 - 25 Ekim 2020, ss.227-238
In this work the preparation of viscoelastic bio-based polyurethane insulation materials (PU insulation materials) using polyols obtained via acid liquefaction of three kinds of plant wastes has been optimized. The liquefaction reagent was a mixture of PEG#400 and glycerin and the liquefaction was carried out in a microwave extraction system (Neos Essential System) equipped with an independent controller and a temperature sensor was in place. Feasible formulations for preparing liquefied biomass-based polyurethane foams were proposed. Thus, the definite amounts of liquefied biomass-based polyol, catalyst, surfactant and water premixed thoroughly in a plastic cup. The pH of the biomass-based polyol obtained above was adjusted by adding 40 wt % sodium hydroxide aqueous solution. Then, the prescript amount of MDI (at an isocyanate index of 90) was added and mixed quickly at a high stirring speed of 8.000 rpm for 15-20 seconds. It was allowed to rise freely at room conditions. Foams were allowed to cure at room temperature for two days and then were removed from the plastic cup before cutting into test samples. Thermal Gravimetric Analysis (TGA) was carried out at a heating rate of 10 oC/min from 25 to 800 oC under 100 ml/min nitrogen flow speed using SHIMADZU TA-60WS model Thermo Gravimetric Analyzer. TGA analysis of five different biomass-containing polyurethane thermal insulation materials was performed and compared with a commercial polyurethane thermal insulation material. Determinations were made with the studies in the literature. It was observed that combining the polyurethane thermal insulation materials after the hydroxylation of biomass contributed to their thermal properties.
Keywords: Biomass, Polyurethane, Insulation Material, Thermal property