| 초록 |
At present, fuel efficiency improvement technologies, such as lightweight materials, engine efficiency improvement, design modification, and eco-friendly car, are in progress due to the tightened international regulations. The research on lightweight materials for the improvement of engine efficiency is ongoing. Thermoexpandable microcapsules(TEMs) are one of the foaming technologies and composited of a core shell structure with uniform increase in mechanical properties. In this study, we applied TEMs for lightweight development to the conventional TPE sheet of layers of dash insulation pad. We investigated the specific gravity, thickness, mechanical properties, acoustic properties, and pore size with 1, 3, and 5 wt% contents of TEMs. Specific gravity was reduced by 14 %, and thickness was increased by 13 % as compared with conventional TPE sheet. D/ISO PAD showed a 5 % lightweight effect. Even though the weight of the TPE sheet filled with TEMs was lighter than the TPE sheets, the acoustic properties were similar. |
