纳米填料对多功能防火涂料性能的影响

The Effect of Nanometer-structured Fillers on Properties of Multifunctional Fire Retardant Coatings

多功能防火涂料可以涂覆在多种金属基材表面,在锂离子电池发生热失控时,有效隔绝热量传递、控制火势走向、延缓热扩散,保护基材的同时也为锂离子电池的安全应用保驾护航。设计开发了一系列由纳米填料,如石墨烯、碳纳米管及无机硅酸盐纳米管,改性的多功能防火涂料。实验结果表明:无机硅酸盐纳米管改性的防火涂料,可以在降低体系颜基比的同时,提高涂层的耐冲击性、绝缘性能(直流6000 V,通电60 s,漏电流<1 mA)和防火隔热性能(1000~1300℃火焰灼烧30 min,非涂层面最高温度为349℃)。

Multifunctional fire retardant coatings could be coated on various metal substrates to effectively decrease the heat transfer rate,control the direction of fire spread,slow down heat diffusion,and protect substrates from damage.Ultimately,this would enhance the safety of lithium-ion batteries during thermal runaway.In this study,a series of modified multifunctional fire retardant coatings were designed and developed by nanometer-structured fillers,such as graphene oxide(GRO),carbon nanotubes(CNTs)and inorganic silicate nanotubes(ISNTs).The results showed that the ISNTs-modified multifunctional fire retardant coatings could improve impact resistance,electrical insulation capabilities(leakage current was lower than 1 mA under a direct voltage of 6000 V for 60 s),and fire resistance performance(during a 30-minute fire burning at 1000-1300℃,the maximum temperature on the noncoated side was below 349℃),while reducing the pigment-binder ratio of the system.