Xu Kai, Tian Xing, Cao Ying, He Yaqi, Xia Yanzhi, Quan Fengyu
State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile Technology, Institute of Marine Biobased Materials, Qingdao University, Qingdao 266071, China.
College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Polymers (Basel). 2021 Jan 29;13(3):430. doi: 10.3390/polym13030430.
Calcium alginate (Ca-Alg) fibers are renewable fibers obtained from the ocean with essential flame retardancy, which have recently been applied as components of flame-retardant paper. However, the application of Ca-Alg fibers is limited because of their tendency to smolder. Therefore, composites papers were fabricated by blending using flame-retardant polyamide-66 (FR-PA), with a 5 wt% content of phosphorous flame retardant, which will form molten carbon during combustion. When the FR-PA content is 30% of the composite paper, FR-PA forms a compact carbon layer on the surface of the Ca-Alg fibers during combustion, which isolates the mass/heat transfer and effectively suppresses the smoldering of Ca-Alg. This consists of a condensed flame retardant mechanism. Furthermore, the combustion and thermal degradation behavior of paper were analyzed by cone calorimetry (CONE), TG and TG-IR. Ca-Alg in the composite paper decomposed and released CO before ignition, which delayed the ignition time. Simultaneously, the FR-PA contained in the composite paper effectively inhibited the combustion of volatile combustibles in the gas phase. Overall, FR-PA and Ca-Alg improve the thermal stability of the composite paper in different temperature regions under air atmosphere. Ca-Alg reduces the formation of aromatic products and NH in the composite paper under N atmosphere. Ca-Alg-based paper with excellent flame retardancy was successfully prepared.
海藻酸钙（Ca-Alg）纤维是从海洋中获取的具有基本阻燃性的可再生纤维，最近已被用作阻燃纸的成分。然而，由于Ca-Alg纤维有阴燃的倾向，其应用受到限制。因此，通过使用含5 wt%磷阻燃剂的阻燃聚酰胺-66（FR-PA）进行共混制备了复合纸，该阻燃剂在燃烧时会形成熔融碳。当FR-PA含量为复合纸的30%时，FR-PA在燃烧过程中在Ca-Alg纤维表面形成致密的碳层，从而隔离质量/热传递并有效抑制Ca-Alg的阴燃。这构成了一种凝聚相阻燃机理。此外，通过锥形量热法（CONE）、热重分析（TG）和热重-红外联用（TG-IR）对纸张的燃烧和热降解行为进行了分析。复合纸中的Ca-Alg在点火前分解并释放出CO，这延迟了点火时间。同时，复合纸中含有的FR-PA有效抑制了气相中挥发性可燃物的燃烧。总体而言，FR-PA和Ca-Alg在空气气氛下不同温度区域提高了复合纸的热稳定性。在氮气气氛下，Ca-Alg减少了复合纸中芳香族产物和NH的生成。成功制备了具有优异阻燃性的Ca-Alg基纸张。
