Akademik Veri Yönetim Sistemi
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