Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.porgcoat.2021.106438 Chanchal Kumar Kundu 1, 2 , Lei Song 1 , Yuan Hu 1
A carbohydrate compound originated from plant species, namely oxidized sucrose (OS) was used as a cross-linking agent to stabilize the layer by layer (LbL) deposited flame retardant coatings developed onto the polyamide 66 textile surfaces. Here, the coating was constructed using some polyelectrolytes like chitosan (CS), sodium alginate (SA), phytic acid (PA) and montmorillonite (MMT) derived from green and mineral sources in a LbL assembly and subsequently, this coating was further treated with a polysaccharide binder like starch and a cross-linking agent like OS. In line, another bio-derived cross-linker, namely citric acid (CA) was used instead of OS and compared herewith. Obtained results showed that OS revealed superior coating stability over CA and in line, OS treated PA66 textiles exhibited better flame retardancy compared to the CA treated one. For example, OS treated fabrics attained a maximum limiting oxygen index (LOI) value by 23.5% along with a significant reduction in the peak heat release rate (pHRR) and total heat release rate (THR) by 36% and 15%, respectively. Meanwhile, OS could improve the stability of such coatings and offer extended durability in flame retardant performance. Thus, it was revealed that oxidized sucrose exhibited its potential to be considered as an effective green flame retardant alongside its cross-linking ability.
中文翻译:
蔗糖衍生物作为交联剂提高聚酰胺 66 纺织品的涂层稳定性和阻燃性
源自植物物种的碳水化合物化合物,即氧化蔗糖 (OS) 被用作交联剂,以稳定在聚酰胺 66 纺织品表面上开发的逐层 (LbL) 沉积的阻燃涂层。在这里,涂层是使用一些聚电解质构建的,如壳聚糖 (CS)、海藻酸钠 (SA)、植酸 (PA) 和蒙脱石 (MMT),这些电解质来源于 LbL 组件中的绿色和矿物来源,随后,该涂层进一步用多糖粘合剂如淀粉和交联剂如 OS。同样,使用另一种生物衍生的交联剂,即柠檬酸 (CA) 代替 OS 并与之进行比较。获得的结果表明,OS 显示出优于 CA 和在线的涂层稳定性,与 CA 处理的纺织品相比,OS 处理的 PA66 纺织品表现出更好的阻燃性。例如,经过 OS 处理的织物获得了 23.5% 的最大极限氧指数 (LOI) 值,同时峰值放热率 (pHRR) 和总放热率 (THR) 分别显着降低了 36% 和 15%。同时,OS 可以提高此类涂层的稳定性,并提供更长的阻燃性能耐久性。因此,表明氧化蔗糖除了具有交联能力外,还表现出被认为是一种有效的绿色阻燃剂的潜力。OS 可以提高此类涂层的稳定性,并提供更长的阻燃性能耐久性。因此,表明氧化蔗糖除了具有交联能力外,还表现出被认为是一种有效的绿色阻燃剂的潜力。OS 可以提高此类涂层的稳定性,并提供更长的阻燃性能耐久性。因此,表明氧化蔗糖除了具有交联能力外,还表现出被认为是一种有效的绿色阻燃剂的潜力。