Biomass-based coating from chitosan for cotton fabric with excellent flame retardancy and improved durability

极限氧指数 材料科学 阻燃剂 锥形量热计 膨胀的 复合材料 涂层 火焰试验 极限抗拉强度 耐久性 可燃性 热解 烧焦 化学工程 工程类
作者
Xuelin Li,Xiao-Hui Shi,Ming‐Jun Chen,Qingyun Liu,Ying-Ming Li,Zhi Li,Yanhao Huang,De‐Yi Wang
出处
期刊:Cellulose [Springer Science+Business Media]
卷期号:29 (9): 5289-5303 被引量:48
标识
DOI:10.1007/s10570-022-04566-x
摘要

Eco-friendly biomass-based coating was designed to endow cotton fabrics with durable flame retardancy through a dip-pad-dry-cure process. The coating involved phosphorylated chitosan (PCS) as intumescent flame retardant that is fixed onto the fiber surface by the co-action of electrostatic interaction and chemical grafting. Consequently, the obtained fabrics exhibit good flame retardancy and improved durability. The resultant cotton fabrics treated by 7.5 wt% of PCS solution show limiting oxygen index (LOI) of 25.7% and self-extinguished immediately after removing the igniter in the vertical flame test. Additionally, the total heat release value and heat release rate are significantly decreased by 59.4% and 88.2%, respectively, in the cone calorimeter test compared with pure cotton. A combined condensed-phase flame-retardant mechanism by forming a phosphorus-rich intumescent and gas-phase mechanism by diluting effect of the non-flammable volatiles is proposed. Moreover, enhanced washing durability is achieved even after 10 detergent laundering cycles with a LOI value of 23% due to the partial chemical grafting of PCS on cotton fibers. Meanwhile, the tensile property remained almost unchanged. Herein, this work provides a promising approach for fabricating durable flame-retardant cotton fabrics with satisfactory tensile performance and for applying to other fabric substrates.
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