LDH@MMT/MZBMSO的制备及其在皮革中的阻燃性能

采用水热法在蒙脱土（MMT）表面原位生长层状双氢氧化物（LDH）,获得了层状双氢氧化物@蒙脱土（LDH@MMT）。通过XRD、SEM、FTIR对LDH@MMT进行了表征。结果表明,LDH和MMT通过氢键复合在一起,呈花状结构。将其引入花椒籽油（ZBMSO）中制得层状双氢氧化物@蒙脱土/改性花椒籽油（LDH@MMT/MZBMSO）,TEM结果表明：LDH@MMT均匀分散在MZBMSO中。将其应用于皮革加脂工艺,结果表明：与MZBMSO加脂坯革相比,当LDH@MMT的质量占ZBMSO的12%时,LDH@MMT/MZBMSO加脂坯革阻燃性能明显提高,加脂坯革氧指数由22.8%提升至28.3%,有焰燃烧时间由87 s减少到43 s,热释放速率降低了43.6%,总热释放速率降低了73.6%,产烟速率降低了63.5%;LDH@MMT包裹在坯革纤维表面,形成的“曲折路径”可减缓热量及烟气的释放,燃烧后在纤维表面形成致密碳层进一步阻隔坯革燃烧过程中释放的热量、烟气,并隔绝氧气,从而提升了加脂坯革的阻燃抑烟性能。

Preparation of LDH@MMT/MZBMSO and its flame retardant properties in leather

The layered double hydroxide (LDH) was grown in situ on the surface of montmorillonite (MMT) by hydrothermal method, and the layered double hydroxide@montmorillonite (LDH@MMT) was obtained. LDH@MMT was characterized by XRD, SEM, FTIR and other means, and the results showed that LDH and MMT were compounded together through hydrogen bonds, forming a flower-like structure. The layered double hydroxide@montmorillonite/modified zanthoxylum bungeanum seed oil (LDH@MMT/MZBMSO) was prepared by introducing LDH@MMT into zanthoxylum bungeanum seed oil(ZBMSO). TEM results showed that LDH@MMT was evenly dispersed in MZBMSO. Appling LDH@MMT/MZBMSO to the leather fatliquoring process, compared with MZBMSO, When the quality of LDH@MMT accounts for 12% of ZBMSO, the flame retardant performance of LDH@MMT/MZBMSO treated crust leather was significantly improved, and the oxygen index of crust leather increased from 22.8% to 28.3%, the after flame time was reduced from 87 s to 43 s, the heat release rate, total heat release rate, and smoke production rate of LDH@MMT/MZBMSO treated crust leather were reduced by 43.6%, 73.6%, and 63.5%, respectively. LDH@MMT wrapped on the surface of the crust leather fiber to form a "torrtuous path" that could slow down the release of heat and smoke, a dense carbon layer was formed on the surface of the fiber to further block the heat and smoke released, and isolated oxygen during the burning process of the crust leather, thus improving the flame retardant and smoke suppression performance of the crust leather.