Impregnation of phytic acid into the delignified wood to realize excellent flame retardant
作者：Kaihao Wang, Dan Meng, Shuheng Wang, Jun Sun, Hongfei Li, Xiaoyu Gu, Sheng Zhang
關(guān)鍵字：植酸浸漬去木質(zhì)素的木材顯著提高木材阻燃性能
論文來源：期刊
具體來源：Industrial Crops and Products
發(fā)表時(shí)間：2022年
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.
在纖維素管腔中引入生物基酸源是增強(qiáng)木制品阻燃的有效途徑。木材首先被脫木素，然后植酸 (PA) 被單獨(dú)吸附到木材的血管中。僅添加 8.0 wt% PA，即可獲得高度阻燃的木材。處理后樣品的極限氧指數(shù)（LOI）達(dá)到37.2%，樣品在UL-94垂直燃燒測(cè)試中也通過了V-0級(jí)，在CONE測(cè)試中，總放熱量相比降低了71.3%到天然木材樣品。對(duì)阻燃機(jī)理進(jìn)行了探索和總結(jié)，包括對(duì)燃燒自由基的捕獲、協(xié)同促進(jìn)炭化和抑制放熱釋煙。熱壓后，經(jīng)過阻燃處理的木材樣品表現(xiàn)出顯著增強(qiáng)的機(jī)械性能，其抗拉強(qiáng)度達(dá)到138 MPa，彎曲強(qiáng)度達(dá)到213 MPa，分別是天然木材的6倍和7.8倍。這項(xiàng)工作為制備家具用阻燃木材提供了一種簡(jiǎn)單且環(huán)保的方法。