Charcoal-Polyurethane Composite Material for Insulation
This research was to optimized preparation conditions of charcoal-polyurethane composite material for using as an insulator. Charcoal was prepared from lignin which is a major component of black liquor. The composition of lignin was analyzed by CHNS/O analyzer, and found that it was composed of Carbon Nitrogen and Oxygen by 60.93, 5.60, and 0.20% respectively. The charcoal was prepared by carbonized lignin at 385 oC for 1 hr at heating rate 10 oC/min and was applied as the reinforced in polyurethane composite. The compressive stress of the charcoal-polyurethane composite material was found between 0.186-0.645 MPa, and thermal conductivity decreased from 0.466 to 0.149 W/m.K with respect to the increment of the percentage of charcoal from 0 to 20 wt%. The lowest thermal conductivity is 0.149 W/m.K at 20 wt% charcoal. Thermal stability of the material was tested by thermal cycling method at 5-80 oC, 500 cycles. The result shows that there is no deterioration and alteration of charcoal-polyurethane composite material. The thermal stability was confirmed by FT-IR and DSC result at pre- and post-thermal cycling testing, the heat capacity were 37.50 and 36.63J/g, respectively which the difference is not significant.
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