酪素基rGO复合乳液的制备及其对皮革阻燃增强效果的研究

Casein based rGO composite emulsion and its flame retardancy as leather finishes

摘要:

为制备具有增强阻燃效果的皮革涂饰材料，本研究首先以天然石墨为原料，采用Hummers法制备氧化石墨烯，并采用NaBH4对其进行还原得到还原氧化石墨烯（rGO）。通过FTIR，XRD和TEM等对其进行表征。结果表明，成功制备了rGO纳米材料。随后，采用物理共混法将rGO引入天然蛋白质酪素体系，制备酪素基rGO复合乳液并将其应用于皮革涂饰，对涂饰后革样的阻燃性能、力学性能和耐干湿擦性能进行测试。结果表明，当rGO的含量为酪素体系溶质质量的0.5%时，与未含rGO的酪素体系相比，涂饰后革样的燃烧速率下降47.2%，极限氧指数（LOI）由24.2%增加至26.3%，热释放速率（HRR）下降53.1%，总热释放率（THR）也有所降低。rGO的引入对涂饰后革样的力学性能和耐干湿擦性能影响不大。

Abstract:

In order to fabricate leather finishing materials with enhanced flame retardant effect, GO was prepared using natural graphite as raw material by modified Hummers method, and then it was reduced by NaBH4. The as-obtained graphene was characterized by FTIR, XRD and TEM, which show that graphene has been successfully prepared. Then, physical blending method was used to introduce graphene into natural protein casein system to prepare casein-based composite emulsion applied as leather finishes. The flame-retardant property, mechanical property, as well as dry and wet rubbing resistance of the finished leather samples were tested. The results show that when the rGO content was 0.5% of the solute quality of the casein system, compared with the casein system without rGO, the combustion rate of the leather samples decreased by 47.2%, the limit oxygen index (LOI) increased from 24.2% to 26.3, the heat release rate (HRR) decreased by 53.1%, and the total heat release rate (THR) also decreased. At the same time, the introduction of graphene has little effect on the mechanical properties, as well as dry and wet rubbing resistance of finished leather samples.