| 摘要 |
<p>[Problems] Provided is a compression-molded product employing a plant material, using no or little petroleum-based resins, having high mechanical strength and thus being suitable for a housing of an electronic device, and a manufacturing method thereof. [Means of Solving] First, wood or bamboo is crushed to obtain wood powder with an average grain size of 5 µm to 100 µm. Next, the wood powder is put in a first mold 11, and a first compression molding step is carried out under the conditions that, for example, a temperature is 160°C and a pressure is 30 MPa. Thus, a temporary molded body 12 is obtained. Subsequently, the temporary molded body 12 is immersed in a flame retardant 13 and a surface of the temporary molded body 12 is impregnated with the flame retardant. Thereafter, the temporary molded body 12 is put in a second mold 14, and a second compression molding step is carried out under the conditions that, for example, a temperature is 200°C and a pressure is 100 MPa. At this time, ingredients such as lignin and a hemicellulose are separated from the wood powder, and function as an adhesive. For this reason, pieces of crushed material are firmly bonded with each other so as to be integrated into a single body. Thus, a compression-molded product 15 with a predetermined shape is obtained.</p> |
