Department of Fire Safety Engineering, Faculty of Geosceince and Environmental Engineering, Southwest Jiaotong University, Chengdu, China.
Institute of Macromolecular Chemistry, Czech Academy of Sciences, 16200 Praha, Czech Republic; CEITEC-Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno 61200, Czech Republic; Pretreatment and Finishing of Cellulosic Based Textiles Department, Textile Industries Research Institute, National Research Centre, 33 EL Buhouth St., Dokki, Giza 12622, Egypt.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127506. doi: 10.1016/j.ijbiomac.2023.127506. Epub 2023 Oct 18.
A highly efficient, bio-ecofriendly, and transparent flame retardant (FR) for cotton fabric was developed and deposited onto the cellulose skeletal structure of cotton fabric through a one-pot sol-gel process. The flame retardant functional coating is composed of ammonium polyphosphate (APP), guar gum (GG), citric acid (CA), and a negligible amount of catalyst. Cotton fabrics were impregnated with different concentrations of ammonium polyphosphate and guar gum, with citric acid as a crosslinking agent. The overall crosslinking and grafting process was proven by FTIR and XPS. Based on the results, the designed coating exhibits over 90 % transmittance in the visible region. A 15 g/m flame-retardant coating induces excellent flame retardant efficiency at ultra-low flame-retardant concentrations of less than 6.25 wt%. Only a 5.25 wt% flame retardant concentration demonstrated condensed phase action, which resulted in 58.5 % and 73.6 % reductions in the pHRR and THR, respectively. Moreover, the limiting oxygen index (LOI) value showed a 74 % increase. The mechanical performance of FR coated cotton fibers was slightly reduced.
开发了一种高效、生物环保且透明的阻燃剂（FR），通过一锅溶胶-凝胶工艺将其沉积到棉织物的纤维素骨架结构上。阻燃功能涂层由磷酸铵（APP）、瓜尔胶（GG）、柠檬酸（CA）和少量催化剂组成。棉织物用不同浓度的磷酸铵和瓜尔胶浸渍，柠檬酸作为交联剂。通过 FTIR 和 XPS 证明了整体交联和接枝过程。基于这些结果，设计的涂层在可见光区域具有超过 90%的透光率。15g/m2 的阻燃涂层在超低阻燃浓度（低于 6.25wt%）下即可实现优异的阻燃效率。只有 5.25wt%的阻燃剂浓度表现出凝聚相作用，分别使 pHRR 和 THR 降低了 58.5%和 73.6%。此外，极限氧指数（LOI）值增加了 74%。FR 涂层棉纤维的机械性能略有降低。
