Research on Preparation of Metasequoia-based Three-layer Parquet and Its Thermal Conductivity and Acoustic Performance

Using Metasequoia glyptostroboides as base material to prepare parquet and comparing with the physical and chemical properties, thermal conductivity and acoustic properties of common multi-layer and three-layer parquet from the market. The results show that the moisture content of M. glyptostroboides based three-layered parquet is 10.7%, the formaldehyde emission is 0.112 mg/m³, and the impregnation and peeling index meets the requirements of national standards. The 3 types of parquet have different structures and tree species composition, and the thermal conductivity is quite different. The thermal conductivity of M. glyptostroboides based three-layer parquet is 0.188, which is the lowest among the 3 kinds of parquet, and its thermal insulation effect is the best. The sound absorption coefficient of M. glyptostroboides based three-layer parquet under 11 frequency conditions in the range of 0.2–2 kHz is higher than that of the other 2 kinds of parquet under the same frequency condition. Density, moisture content, paint film thickness, etc. all have an impact on the sound absorption coefficient of the parquet.