Li Min, Zhu Zhaoqi, Jiao Rui, Chen Yanjun, Cao Xiaoyin, Sun Hanxue, Li Jiyan, Li An
College of Petrochemical Technology, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China.
College of Petrochemical Technology, Lanzhou University of Technology, Langongping Road 287, Lanzhou 730050, PR China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt A):719-730. doi: 10.1016/j.jcis.2023.10.073. Epub 2023 Oct 17.
The creation of high-performance thermal insulation and flame-retardant materials is of great importance for minimizing energy consumption and reducing fire risk for modern buildings. Herein, we report the creation of a new composite aerogel, which was prepared by incorporation of 9,10-Dihydro-9-oxa-10-phosphaphenanthrene 10-Oxide-3-Aminopropyl triethoxysilane (DOPO-KH550) modified hollow glass microspheres (HGM) into polyvinyl alcohol (PVA) using citric acid as a cross-linker, as a kind of thermal insulation and flame retardant materials (abbreviated as PVA-DKHGM). The as-synthesized PVA-DKHGM composite exhibits superior thermal conductivity of 0.0187 W m K, owing to the hollow structure of the hollow glass microspheres and rich porosity. Besides, it reaches V-0 level at the UL-94 test and the peak heat release rate (pHRR) was measured to be 114.93 (kW/m) which is lower than most composites now. These results are attributed to the synergy effect of the hollow glass microsphere and DOPO-KH550 which offers the composites aerogel excellent flame retardancy. Owing to its advantages such as lightweight, highly porous, thermally stable, simple to prepare, high mechanical strength, and can be further scaled up, our PVA-DKHGM aerogel may hold great potential for practical applications in construction of energy-saving modern buildings.
高性能保温和阻燃材料的制备对于降低现代建筑的能源消耗和火灾风险具有重要意义。在此，我们报道了一种新型复合气凝胶的制备，它是通过将9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物-3-氨丙基三乙氧基硅烷（DOPO-KH550）改性的中空玻璃微球（HGM）以柠檬酸作为交联剂掺入聚乙烯醇（PVA）中而制备的，作为一种保温和阻燃材料（简称为PVA-DKHGM）。所合成的PVA-DKHGM复合材料表现出0.0187 W m K的优异热导率，这归因于中空玻璃微球的中空结构和丰富的孔隙率。此外，它在UL-94测试中达到V-0级，峰值热释放速率（pHRR）经测量为114.93（kW/m），低于目前大多数复合材料。这些结果归因于中空玻璃微球和DOPO-KH550的协同效应，这赋予了复合气凝胶优异的阻燃性。由于其具有轻质、高孔隙率、热稳定性好、制备简单、机械强度高以及可进一步放大等优点，我们的PVA-DKHGM气凝胶在节能现代建筑施工中的实际应用可能具有巨大潜力。
