Impregnation of phytic acid into the delignified wood to realize excellent flame retardant
Impregnation of phytic acid into the delignified wood to realize excellent flame retardant
复制标题
将植酸浸渍到脱木素木材中以实现优异的阻燃性
DOI：
10.1016/j.indcrop.2021.114364
复制
发表时间：
2021-12-09
影响因子：
5.9
通讯作者：
Zhang, Sheng
中科院分区：
文献类型：
--
作者：
Wang, Kaihao;Meng, Dan;Zhang, Sheng
在纤维素内腔中引入生物基酸源是增强木制品阻燃性的有效方法。木材首先脱木素，然后植酸（PA）被单独吸附到木材的导管中。当PA的添加量仅为8.0wt%时，可获得高阻燃木材。处理后的木材的极限氧指数（LOI）达到37.2%，垂直燃烧通过UL-94的V-0级，锥形燃烧的总放热量比天然木材降低了71.3%。对阻燃机理进行了探讨和总结，认为阻燃机理主要有捕获燃烧自由基、协同促进成炭、抑制放热和发烟。经阻燃处理后的木材经热压处理后，其力学性能得到明显提高，拉伸强度达到138 MPa，弯曲强度达到213 MPa，分别是天然木材的6倍和7.8倍。本研究为家具用阻燃木材的制备提供了一种简单、环保的方法。
Introducing bio-based acid sources into the cellulose lumens is an effective way to enhance the flame retardant of wooden products. The wood was delignified at first and then phytic acid (PA) was adsorbed solely into the vessels of the wood. With only 8.0 wt% addition of PA, the highly flame retardant wood was obtained. The limiting oxygen index (LOI) of the treated sample was reached 37.2%, the sample also passed the V-0 grade in the UL-94 vertical burning test, and in the CONE test, the total heat release was reduced by 71.3% compared to that of the Natural wood sample. The flame retardant mechanism was probed and summarized as capture of the flaming radicals, the synergistic promotion on charring and suppression on heat and smoke release. After hot-pressing, the flame-retardant treated wood sample exhibited much enhanced mechanical properties, its tensile strength went up to 138 MPa and its bending strength reached 213 MPa, which are 6 times and 7.8 times higher than that of the Natural wood, respectively. This work provided a simple and environmental-friendly method to prepare flame retardant wood for furniture applications.