可膨胀石墨对环氧树脂的阻燃改性

Flame Retardation of Epoxy Resin with Expansible Graphite

本文利用环氧树脂E-51和固化剂聚醚胺WHR-H023(质量比为3∶1)制成树脂基体。采用H_2SO_4和HNO_3对颗粒尺寸为80目的可膨胀石墨进行表面酸化处理,制备亲水性酸化可膨胀石墨;并将酸化处理的可膨胀石墨及未经酸化处理的可膨胀石墨分别对上述树脂基体进行阻燃改性,石墨添加量为5%、10%和15%。借助红外光谱分析仪检测酸化处理的可膨胀石墨表面羧基、羟基等官能团的接枝情况;利用极限氧指数分析仪和万能材料试验机分别测试改性树脂基体材料的极限氧指数(LOI)及拉伸性能;采用扫描电子显微镜(SEM)观察改性树脂基体材料的断面。研究结果表明,酸化可膨胀石墨比未经酸化处理的可膨胀石墨对环氧树脂基体的阻燃效果更佳,且拉伸性能下降更少。

Resin matrix was prepared composing of epoxy resin ES1 and polyether amine WHR-HO23 in a mass ratio of 3：1. Acidizing the surface of expansible graphite with a particle size of 80 mesh using H2SO4 and HNO3, hydrophilic and acidulated expansible graphite was prepared. Flame-retardant modification of the above resin matrix was conducted using acidulated expansible graphite and non-acidulated expansible graphite, respectively. Supplementation of the expansible graphite was 50%, 10%, and 15 %. Fourier Transform Infrared spectrometer （FT-IR） was used to detect the grafting of carboxyl and hydroxy on the surface of acidulated expansible graphite. Limit Oxygen Index apparatus （LFY-605） and Universal Material Testing Machine （Instron 3385H） were used to test the LOI and tensile property of the modified resin-matrix materials. Scanning Electron Microscope （SEM） was used to observe the fracture surface of the modified resin-matrix materials. Results showed that acidulated expansible graphite has better flame retardant efficiency and less influence on the tensile property of the resin matrix than non-acidulated expansible graphite.