Bio-based materials have been noticed for the continuous environmental pollution and resource shortage. In this paper, lignosulfonate (LS) and chitosan (CS) were selected to be flame-retardants. In the vertical flame test (VFT), LS/cotton-17.1 wt%, CS/LS/cotton-17.0 wt%, and CS/LS/cotton-25.2 wt% obtained lower afterflame times than that of uncoated cotton fabrics, while LS/cotton-17.1 wt% had serious afterglow time of 70 s. However, the afterglow time of CS/LS/cotton-25.2 wt% was 11 s, which decreased owing to the increased amount of CS. LS/cotton-17.1 wt%, CS/LS/cotton-17.0 wt%, and CS/LS/cotton-25.2 wt% presented limiting oxygen index values of 24.7%, 25.0%, and 26.0%, respectively. The scanning electron microscope images of char residues after the VFT showed that CS and LS formed an intumescent flame-retardant system, and cotton fibers remained intact structure. Meanwhile, the results of thermogravimetric analysis suggested that flame-retardant cotton fabrics can generate stable char residues. In N₂ atmosphere, CS/LS/cotton-25.2 wt% generated 27.1% stable char residues. Moreover, the addition of CS/LS decreased the heat release rate and total heat release values and this system performed well in smoke suppression. The flame-retardant mechanism of the system might belong to gas-phased because more non-combustible products were generated in the thermal degradation process.

生物基材料因持续的环境污染和资源短缺而备受关注。本文选择木质素磺酸盐（LS）和壳聚糖（CS）作为阻燃剂。在垂直火焰测试（VFT）中，LS /棉17.1 wt％，CS / LS /棉17.0 wt％和CS / LS /棉25.2 wt％的余燃时间比未涂覆的棉织物低，而LS /棉17.1 wt％的严重余辉时间为70 s。但是，CS / LS /棉25.2wt％的余辉时间为11s，由于CS的增加而减少。LS /棉17.1重量％，CS / LS /棉17.0重量％和CS / LS /棉25.2重量％的极限氧指数分别为24.7％，25.0％和26.0％。VFT后炭残留物的扫描电子显微镜图像显示，CS和LS形成了膨胀型阻燃体系，棉纤维保持完整的结构。同时，热重分析的结果表明，阻燃棉织物可产生稳定的炭渣。旅店_在2个大气压下，CS / LS /棉25.2 wt％产生27.1％的稳定焦炭残留物。此外，添加CS / LS降低了放热速率和总放热值，该系统在抑制烟雾方面表现良好。该系统的阻燃机理可能属于气相，因为在热降解过程中会产生更多的不燃产物。