Study On The Preparation And Properties Of Thermal Conductivity Of Wood Composite Materials

In this study, wood fiber as the main material, micro and nano graphite as thermal conductivity material, study on the preparation and properties of the thermal conductivity wood composite materials with the artificial board technology. Focuses on the function design of thermal conductivity composite materials, the process optimization, research the conduction mechanism to improve the thermal conductivity of wood composite materials, and by means of scanning electron microscopy analysis of the relationship between the wood composite materials microstructure and thermal conductivity.The results are as follows:(1) The optimum preparation process for composite materials:the graphite filling rate is 15%, the graphite particle size is 2500 mesh, coupling agent of titanate, under these conditions, the prepared composite material for the MOR is 35MPa, the MOE is 17864MPa, the internal bond strength is 0.31MPa, the thickness swelling rate is 17.1%, the thermal conductivity is 0.266 (W/(m·K))(2) Different factors affecting the mechanical properties of composites with different, graphite filling rate largest influence the strength of composite material mechanics, the graphite filling rate increased from 5% to 15%, the MOR is reduced by 70.7%, the MOE decreased by 9.3%, internal bond strength is decreased by 19.8%, however, the thickness swelling of the composite material increased by 5.8%. The composite materials prepared by 2500 mesh graphite compared with the composite materials prepared by 300 mesh graphite:the MOR is reduced by 22%, the MOE decreased by 4.3%, internal bond strength is decreased by 6.8%, the thickness swelling of the composite material increased by 3.1%. The graphite particle size largest influence the thermal conductivity of composite material, followed by the graphite filling rate. The addition of titanate coupling agent can improve the mechanical strength and the thermal conductivity of the composite material.(3) As can be seen from the scanning electron micrographs:300 mesh particle size of the graphite and wood fiber linked closely together, but unevenly dispersed; 700 mesh particle size of graphite dispersed more evenly than 300 mesh graphite, can form a " thermal network", makes the performance of thermal conductivity improvement, graphite particles cannot be closely combined with fiber, there is gap between graphite and fiber, makes the mechanical strength decreased; 2500 mesh size of graphite and wood fiber uniformly mixed, almost no gap and better dispersion, but between graphite and fiber mainly through adsorption binding force, so the mechanical strength is low.