< 구두-E-03 > 열수 탄화에 의한 탄소 미립자의 합성과 중 밀도 섬유 (MDF) 판재에 탄소 미립자가 충진제로서 복합재에 미치는 영향 = < 구두-E-03 > Syntheses of carbon microspheres by hydrothermal carbonization and Influence of carbon microspheres as filler on medium density fiber (MDF) board Composites

다국어 초록 (Multilingual Abstract)

This article details the syntheses of carbon microspheres from rubberwood, which is one of the largest commodity plants, via hydrothermal and evaluation of their characteristics. The syntheses were coordinated in excess of water (for water ratio was 25-35 × weight of biomass) and different operating time i.e., 5-7 hours at fixed temperature 260 °C. The carbon content as high as 68% was developed from rubber wood biomass by hydrothermal processing of a mixture containing 35 times more water than the solid raw biomass at a temperature of 260 °C for 7 hours. The prepared carbon microspheres were used as fillers in urea-formaldehyde adhesive in different weight concentration up to 5%. The dispersion of carbon materials into UF resin matrix were evaluated using Thermo gravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared (FTIR), X-ray diffraction (XRD) and solution rheology. The uniform dispersion of the carbon microspheres in the resin undertaken by mechanical stirring is confirmed on curing. The result from the curing reaction showed an increasing trend with the addition of carbon microspheres concentration. The X-ray-based measurement of CrI indicates that carbon microspheres increased the crystallinity of UF resin, whereas the maximum value was observed at CF-1 i.e., 87.3 %. The MDF was prepared by mixing of rubber wood fibers and UF/carbon microspheres, resin at different weight percentages, i.e. 1, 2.5, 3.5 and 5. The mixing of carbon microspheres enhanced the heat transfer during the hot pressing of MDF board composites. The core temperature reached 100 °C in 74 seconds on the board made using carbon microspheres. These values are on the lower side compared to the control board made without carbon material i.e., 84 seconds. The internal bonding (IB) strength and the modulus of rupture (MOR) estimated for the MDF is observed to have a maximum of 1 wt. % concentration of carbon microspheres prepared by HTC method. The IB and MOR values of boards made by 1 wt. % of carbon microspheres are 0.72MPa and 37.72MPa respectively which are significantly higher than the boards made without carbon microspheres i.e., IB and MOR values are 0.56 MPa and 32.31 MPa respectively.