阻燃剂对双酚F型环氧树脂液氧相容性影响

为研究环氧树脂阻燃改性对其液氧相容性的影响,本文通过添加六溴环十二烷和三氧化二锑对双酚F型环氧树脂进行阻燃改性,并通过对阻燃改性树脂进行液氧相容性测试来研究其液氧相容性.实验结果表明:添加质量分数4.8%的三氧化二锑可改善树脂的液氧相容性;添加质量分数6.8%六溴环十二烷和2.2%三氧化二锑的双酚F型环氧树脂表现出更好的液氧相容性.仅添加质量分数9.0%六溴环十二烷的双酚F型环氧树脂表现出非常好的液氧相容性,在20次液氧冲击实验中未表现出敏感性反应.为了更清楚地分析液氧相容性机理,对冲击前后的试样表面进行扫描电镜(SEM)和X射线光电子能谱(XPS)分析.结果表明:六溴环十二烷和三氧化二锑在冲击过程中抑制环氧树脂与液氧反应,提高了环氧树脂与液氧的相容性.

Effect of flame retardants on liquid oxygen compatibility of bisphenol F epoxy resin

To investigate the liquid oxygen compatibility of flame retardant modified epoxy resin, the addition of hexabromocyclododecane and antimony trioxide were used to modify the bisphenol F epoxy resin. Then, the liquid oxygen compatibility of resin was estimated according to test standard ASTM D2512-95(2008). The results showed that the addition of 4.8wt.% antimony trioxide could improve the liquid oxygen compatibility of resin and the addition of 6.8wt.% hexabromocyclododecane and 2.2wt.% antimony trioxide showed better liquid oxygen compatibility. However, two kinds of resin still exhibited some sensitivity reaction, which was due to the impact energy of striker pins made the epoxy resin materials to reach hot point. A lot of heat was released due to the reaction of hot point zone with liquid oxygen, which led to the rapid expansion and vapourization, and then explosion. No sensitive reaction occurred when the addition of 6.8wt.% hexabromocyclododecane was mechanically impacted for 20 times, which indicated that the modified bisphenol F epoxy resin was the compatibility with liquid oxygen. To further analyze the liquid oxygen compatibility mechanism of the resin before and after the mechanical impact, the surface of the specimen before and after the mechanical impact was analyzed by scanning electron microscopy (SEM) and the X-ray photoelectron spectroscopy (XPS). The results confirmed the reaction of the epoxy resin with liquid oxygen under mechanical impact was inhibited and the liquid oxygen compatibility of epoxy resin was improved after adding hexabromocyclododecane and antimony trioxide.