Abstract:

In order to explore the method of application field of of tannery sludge protein, the biomass flame retardant coating was constructed by layer-by-layer self-assembly on the surface of cotton fabric using tannery sludge protein phytic acid and chitosan as raw materials. When the coating number reached 15TL (three layers), it could be observed by SEM that the coating was evenly adsorbed on the surface of cotton fabric. The thermal decomposition temperature (T_5%) of 15TL cotton fabric decreased, which was beneficial to the production of protective carbon layer and improved the thermal stability. Importantly, unfinished cotton fabrics burned quickly when exposed to flame, whereas 15TL cotton fabrics could not be ignited by flame and self-extinguish immediately after the fire left. Compared with unfinished cotton fabric, peak heat release rate (PHRR) and total heat release amount (THR) of 15TL cotton fabric decreased by 33.1% and 38.9%, respectively, showing excellent flame retardant performance and improving the fire safety. The gaseous and condensed analysis demonstrated that biomass flame retardant coating released non-flammable NH₃ gas, inhibited the effusion pyrolysis products as flammable gas CO, C-H compounds, ethers and carbonyl compounds, and promoted the generation of high graphitized protective carbon layer on surface of cotton fabrics.

Key words: tanning sludge protein, flame retardant coating, LBL self-assembly, cotton fabric

摘要：

为合理探讨制革污泥蛋白质的应用领域，本研究以制革污泥蛋白质、植酸和壳聚糖为原料，通过层层自组装的方式在棉织物表面构筑生物质阻燃涂层。当涂层数达到15TL（three layers）时，通过SEM可以观察到涂层均匀地吸附在棉织物的表面。15TL棉织物的热分解温度（T_5%）下降，有利于保护炭层的生产，提升热稳定性。最重要的是，未整理棉织物接触火焰迅速燃烧，而15TL棉织物无法被火焰点燃，当火源离开后立即自熄。相比于未整理棉织物，15TL棉织物的热释放速率峰值（PHRR）和总热释放量（THR）分别下降了33.1%和38.9%，表现出了优异的阻燃性能，提高了火灾安全性。气相和凝聚相阻燃机理表明，在燃烧时生物质阻燃涂层释放出不可燃气体NH₃，并抑制热裂解产物可燃性气体CO、C-H化合物、醚类物质和羰基类物质的释放，同时促进棉织物表面生成石墨化程度高的保护炭层。

关键词: 制革污泥蛋白质, 阻燃涂层, 层层自组装, 棉织物