Li Xu, Xu Yue, An Xin-Yu, Gong Ling, Wang Rui, Liu Zhi-Ming
College of Home and Art Design, Northeast Forestry University, Harbin 150040, China; Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Int J Biol Macromol. 2025 Apr;304(Pt 2):140947. doi: 10.1016/j.ijbiomac.2025.140947. Epub 2025 Feb 13.
With the continuous improvement of living standards, the development of eco-friendly rigid polyurethane foam (RPUF) materials with excellent flame retardancy, thermal insulation, and outstanding mechanical strength has become an urgent challenge. This study presented an innovative strategy using lignin as a mechanical reinforcement and flame-retardant synergist, combined with DMMP and EG as highly efficient flame retardants. Furthermore, the incorporation of a silica aerogel coating via surface post-treatment significantly enhanced the flame retardancy of the composite. Compared to neat RPUF, the Ct-RPUF/L/FR composites exhibited an increased LOI of 25.3 %, a delayed ignition time of 6.0 s, and reductions in total heat release (THR) and total smoke production (TSP) to 8.6 MJ/m and 2.11 m, respectively, while achieving the UL-94 V-0 rating, thereby minimizing fire hazards. Additionally, the compressive strength of the composite improved from 132.4 kPa for neat RPUF to 178.3 kPa, with a thermal conductivity of only 30.11 mW/(m·K), maintaining comparable thermal insulation performance to neat RPUF. Moreover, the evidence provided by the Life Cycle Assessment (LCA) indicated that the fire-retardant strategy used in this study resulted in lower environmental impact (EI) compared to traditional fire-retardant methods. This study highlighted the synergistic effects of lignin, flame retardants, and silica aerogel, providing new opportunities for the development of advanced RPUF materials with enhanced fire safety and durability, suitable for practical applications.
随着生活水平的不断提高，开发具有优异阻燃性、隔热性和出色机械强度的环保型硬质聚氨酯泡沫（RPUF）材料已成为一项紧迫的挑战。本研究提出了一种创新策略，使用木质素作为机械增强剂和阻燃增效剂，与DMMP和EG作为高效阻燃剂相结合。此外，通过表面后处理引入二氧化硅气凝胶涂层显著提高了复合材料的阻燃性。与纯RPUF相比，Ct-RPUF/L/FR复合材料的极限氧指数（LOI）提高了25.3%，点火时间延迟了6.0秒，总热释放（THR）和总产烟量（TSP）分别降至8.6 MJ/m和2.11 m，同时达到了UL-94 V-0等级，从而将火灾危险降至最低。此外，复合材料的抗压强度从纯RPUF的132.4 kPa提高到178.3 kPa，热导率仅为30.11 mW/(m·K)，与纯RPUF保持相当的隔热性能。此外，生命周期评估（LCA）提供的证据表明，本研究中使用的阻燃策略与传统阻燃方法相比，对环境的影响（EI）更低。本研究突出了木质素、阻燃剂和二氧化硅气凝胶的协同效应，为开发具有更高消防安全和耐久性的先进RPUF材料提供了新的机会，适用于实际应用。
