Han Ding, Sun Xiankai, Zhang Shichao, Wu Linghao, Ai Bing, Sun Haoran, Chen Yufeng
China Building Materials Academy Co., Ltd No.1 Guan Zhuang Dong Li, Chaoyang District Beijing 100024 P. R. China
RSC Adv. 2024 Apr 22;14(18):12911-12922. doi: 10.1039/d4ra00426d. eCollection 2024 Apr 16.
Thermal insulation materials with good flame-retardant properties have attracted widespread attention because of their huge application potential. Traditional petrochemical-based polymer insulation materials are flammable and have problems with environmental pollution. The microtubule structure is a perfect microstructure with excellent thermal insulation performance. In addition, the microtubule structure also has low density and high elasticity. Therefore, the microtubule structure is an important reference microstructure for the development of efficient thermal insulation materials. In this paper, a cellulose/SiO composite microtube thermal insulation superfoam has been successfully prepared. Cellulose microtubules were successfully prepared from poplar sawdust by chemical methods. The SiO aerogel precursor solution can be quickly adsorbed by the delignified cellulose microtubes. The SiO aerogel shells are evenly distributed only on the inner and outer walls of the delignified cellulose microtubes. The cellulose/SiO microtube composite (CSMC) superfoam exhibits low density, good mechanical properties, and low thermal conductivity (as low as 0.042 ± 0.0018 W m K). The CSMC superfoam exhibits excellent self-extinguishing and flame-retardant properties. After being burned by a butane flame, the superfoam still has certain mechanical properties. The thermal conductivity of the B-CSMC superfoam (the CSMC superfoam burned by a butane flame) is about 0.050 W m K. The B-CSMC superfoam remained almost unchanged after being continuously ablated by a butane flame for 3600 seconds.
具有良好阻燃性能的保温材料因其巨大的应用潜力而受到广泛关注。传统的石化基聚合物保温材料易燃且存在环境污染问题。微管结构是一种具有优异保温性能的完美微观结构。此外，微管结构还具有低密度和高弹性。因此，微管结构是开发高效保温材料的重要参考微观结构。本文成功制备了一种纤维素/SiO复合微管保温超级泡沫材料。通过化学方法从杨木锯末中成功制备了纤维素微管。SiO气凝胶前驱体溶液能被脱木质素的纤维素微管快速吸附。SiO气凝胶壳层仅均匀分布在脱木质素纤维素微管的内壁和外壁上。纤维素/SiO微管复合材料（CSMC）超级泡沫材料具有低密度、良好的力学性能和低导热率（低至0.042±0.0018W·m⁻¹·K⁻¹）。CSMC超级泡沫材料具有优异的自熄和阻燃性能。在被丁烷火焰燃烧后，该超级泡沫材料仍具有一定的力学性能。B-CSMC超级泡沫材料（被丁烷火焰燃烧后的CSMC超级泡沫材料）的导热率约为0.050W·m⁻¹·K⁻¹。B-CSMC超级泡沫材料在被丁烷火焰连续烧蚀3600秒后几乎没有变化。
