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Synergistically improved flame retardancy of the cotton fabric finished by silica-coupling agent-zinc borate hybrid sol
Journal of Industrial Textiles ( IF 3.2 ) Pub Date : 2021-07-20 , DOI: 10.1177/15280837211028800
Dan Li 1 , Zhen-hua Wang 1 , Yuan-shu Zhu 1 , Fei You 1 , Song-tao Zhou 1 , Gang Li 1 , Xue-feng Zhang 1 , Chang Zhou 1
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The sol-gel process has been applied to cotton fabrics to cover the fibers with a silica-based film, which can improve their thermal oxidation and combustion behaviors. Silica sol, silane coupling agent 3-glycidoxypropyltrimethoxysilane (KH560) and flame retardant zinc borate (ZB) are used together to prepare SiO2-KH560-ZB hybrid sol, which is then finished on the surface of cotton fabric through impregnation and baking. Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), limiting oxygen index analysis (LOI) and microscale combustion calorimetry (MCC) are used to characterize functional groups, thermal stability and flammability properties of finished fabrics. Surface morphology of sol modified cotton fabrics are analyzed by scanning electron microscopy (SEM) and energy dispersive X-Ray spectroscopy (EDX). Results show the sols are successfully converted into gel coatings onto cotton fabrics, and continuous smoldering phenomenon of resulted fabrics disappears. ΔLOI/Δm of SiO2-KH560-ZB coated cotton fabric reaches the highest of 0.37%/g, char residue rate is as high as 28.43% and the peak heat release rate (PHRR) is reduced by 26.9% (83.7 W/g). KH560 has a significant coupling effect on combining components in the sol system and increases compatibility between sols and cotton fabrics. ZB (cooling, separation, dilution and suppression), silica sol (physical barrier) and KH560 show excellent synergistic effects in enhancing overall flame retardancy.



中文翻译:

二氧化硅-偶联剂-硼酸锌杂化溶胶整理棉织物的协同提高阻燃性

溶胶-凝胶工艺已应用于棉织物,用二氧化硅基薄膜覆盖纤维,这可以改善它们的热氧化和燃烧行为。硅溶胶、硅烷偶联剂3-环氧丙氧基丙基三甲氧基硅烷(KH560)和阻燃硼酸锌(ZB)共同制备SiO 2-KH560-ZB混合溶胶,通过浸渍和烘烤在棉织物表面完成。傅里叶变换红外光谱 (FTIR)、热重分析 (TGA)、极限氧指数分析 (LOI) 和微量燃烧量热法 (MCC) 用于表征成品织物的官能团、热稳定性和可燃性。通过扫描电子显微镜 (SEM) 和能量色散 X 射线光谱 (EDX) 分析溶胶改性棉织物的表面形态。结果表明,溶胶成功转化为凝胶涂层到棉织物上,所得织物连续阴燃现象消失。SiO 2 的ΔLOI/Δm-KH560-ZB涂层棉织物最高可达0.37%/g,残炭率高达28.43%,峰值放热率(PHRR)降低26.9%(83.7 W/g)。KH560对溶胶体系中的组合组分有显着的偶联作用,增加溶胶与棉织物的相容性。ZB(冷却、分离、稀释和抑制)、硅溶胶(物理屏障)和 KH560 在增强整体阻燃性方面表现出优异的协同效应。

更新日期:2021-07-21
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