压缩致密化阻燃木材的燃烧特性和成炭行为研究  

Study on combustion characteristics and char formation behavior of compressed densifying flame-retardant wood

作　　者：颜龙[1] 唐欣雨 冯钰微 赵雯筠 徐志胜[1] YAN Long;TANG Xinyu;FENG Yuwei;ZHAO Wenjun;XU Zhisheng(Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha Hunan 410075,China)

机构地区：[1]中南大学防灾科学与安全技术研究所,湖南长沙410075

出　　处：《中国安全生产科学技术》2022年第9期160-166,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51906261);湖南省重点研发计划项目(2021SK2054);湖南省高新技术产业科技创新引领计划项目(2020GK2079);中南大学中央高校基本科研业务费专项项目(2022ZZTS0668)。

摘　　要：为增强木材的阻燃性能,采用压缩致密化工艺制备致密化阻燃木材,并对其燃烧特性与成炭行为进行研究。结果表明:压缩致密化工艺能促进木材在燃烧过程中形成更多的芳香结构以增强炭层的致密性和隔热性,进而有效阻隔热量和氧气进入木材内部,使致密化木材表现出良好的阻燃性和自熄性。压缩致密化木材的阻燃和隔热性能与去木质化程度密切相关,并随去木质化程度的增加呈先提高后下降的趋势。经过24 h去木质素处理后的致密化木材的极限氧指数增加到39.5%并达到UL94 V-0级,总释放热和2400 s背面平衡温度相比于未去木质素的致密化木材分别下降了25.8%和21.4%,表现出最佳的阻燃和隔热性能。In order to improve the flame retardancy of wood,the compressed densifying technology was applied to prepare the densifying flame-retardant wood,and its combustion characteristics and char formation behavior were studied.The results showed that the compressed densifying technology could promote the formation of more aromatic structures in the combustion process of wood to enhance the compactness and thermal insulation of char layer,thus effectively block the heat and oxygen into the wood interior,which made the densifying wood present good flame retardancy and self-extinguishing property.The flame retardancy and thermal insulation property of compressed densifying wood were closely related to the degree of delignification,and presented a trend of increasing first and then decreasing with the increase of the degree of delignification.The limiting oxygen index of the densifying wood after 24 h delignification increased to 39.5%and reached UL94 V-0 rating,and compared with the densifying wood without delignification,the total heat release and the backside equilibrium temperature at 2400 s decreased by 25.8%and 21.4%,respectively,showing the best flame retardancy and thermal insulation property.

关 键 词：致密化阻燃木材 成炭行为 热稳定性 隔热性能 极限氧指数 

分 类 号：X932[环境科学与工程—安全科学]