Liu Qiangqiang, Chai Yubo, Ni Lin, Lyu Wenhua
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
Materials (Basel). 2020 Oct 9;13(20):4478. doi: 10.3390/ma13204478.
This paper presents experimental research on the flame-retardant properties and thermal decomposition kinetics of wood treated by boric-acid-modified silica sol. The poplar wood was impregnated with pure silica sol and boric-acid-modified silica sol. The results showed that modifiers can be observed in the cell wall and cell lumen. The ignition time, second peak of the heat release rate, total heat release, and mass loss of the W-Si/B were delayed obviously. The composite silicon modification had a positive impact on carbonization. Thermogravimetric analysis showed that the residual mass of W-Si/B was enhanced and the thermal degradation rate was considerably decreased. By thermal decomposition kinetics analysis, the boric acid can catalyze the thermal degradation and carbonization of poplar wood. In other words, wood treated with boric-acid-modified silica sol showed significant improvement in terms of flame retardancy, compared with wood treated with common silica sol.
本文介绍了硼酸改性硅溶胶处理木材的阻燃性能和热分解动力学的实验研究。将杨木用纯硅溶胶和硼酸改性硅溶胶进行浸渍处理。结果表明，在细胞壁和细胞腔中可观察到改性剂。W-Si/B（硼酸改性硅溶胶处理的木材）的着火时间、热释放速率的第二个峰值、总热释放量和质量损失均明显延迟。复合硅改性对碳化有积极影响。热重分析表明，W-Si/B的残余质量增加，热降解速率显著降低。通过热分解动力学分析可知，硼酸可催化杨木的热降解和碳化。换句话说，与用普通硅溶胶处理的木材相比，用硼酸改性硅溶胶处理的木材在阻燃性方面有显著改善。
