The evaluation of physical properties for environmentally feasible product from waste wood and its development of a new use

木本生物质是可再生的有机资源，具有吸收和固定二氧化碳的特性。作为环境协调型能源资源，它也因其储量丰富而备受关注。然而，大量的木材废料被刮掉而没有被使用。因此，从全球环境保护和零排放的角度来看，有必要有效地利用木材废料。玻璃棉、聚苯乙烯泡沫塑料和聚氨酯泡沫塑料等一般隔热材料正在作为工业废料被刮除。本研究以多元醇为液化剂，硫酸为催化剂，对木材废弃物进行液化，并以液化木材为原料制备泡沫塑料。此外，还对液化木材的一些性能和不同条件下合成的泡沫材料的物理性能进行了评价，并与建筑保温材料进行了比较，采用PLACEL303和PLACEL205U混合溶剂对液化木材的粘度和羟值进行了控制。研究了泡沫材料的导热系数与气泡密度和气泡状态的关系。高发泡倍率和低密度是合成高保温性能的关键.我们已经知道，即使密度很低，热传导率也可能由于热传导辐射的影响而增加。结果表明，气泡直径均匀、细小是提高绝热性能的必要条件。

Woody biomass is the renewable organic resources, and it has the feature of absorbing and fixing carbon dioxide. It is also paid attention as the energy resource of environmental harmony type due to its abundance. A much amount of wood waste is,however, being scraped without being used. Therefore, it is necessary to use the wood waste effectively from a viewpoint of global environmental conservation and zero emission. General heat insulators such as the glass wool, the polystyrene foam and polyurethane foam are being scraped as industrial waste. And environmental disruption of waste materials have been developing rapidly.In this study, wood waste was liquefied by Polyol in the presence of sulfuric acid as a catalyst, and the foam was synthesized by using liquefied wood. In addition, some properties of liquefied wood and physical properties of the foam synthesized in various conditions were evaluated, and compared to that in heat insulator for construction.The viscosity and the hydroxyl value of liquefied wood were controlled by mixing PLACCEL303 and PLACCEL205U used as solvent. The correlation between the thermal conductivity and the density or state of the bubble of foam were investigated. The high foam magnification and low density were subjected to synthesize high thermal insulating properties. We have understood that the thermal conductivity probably increases by the influence of the radiation of heat transmission, even if the density is low. It was found that the uniform and minuteness diameter of the bubble were required to improve the thermal insulating properties.