氧指数测定仪的改进及其应用

氧指数测定仪是用来鉴定聚合物材料难燃性的仪器。现有氧指数仪存在对样品形状有限制和测试数据少等缺陷。改进型氧指数测定仪由氮气测量与控制装置、氧气测量与控制装置、氮气与氧气混合装置、丙烷点火器、燃烧系统、样品温度与时间测量装置构成。改进型氧指数测定仪特别适用于没有固定形状的样品,测试结果包括氧指数值和燃烧温度-时间曲线,氧指数大小基于燃烧温度而确定。对于氧指数大于80的样品,改进后的氧指数测定仪可以通过样品燃烧温度的高低来判断阻燃性能的相对优劣。改进型氧指数仪适应的样品范围更广、提供测试数据更多和更科学,也更能适应实验室研究和实验教学的需要。

New Powder Oxygen Index Tester and Its Usage

The oxygen index test instrument is usually used for the classification of the polymeric flame retardancy. The existing tester demands self support samples and provides reduced test results. The new oxygen index tester includes oxygen flow rate measurement and adjustment, nitrogen flow rate measurement and adjustment, nitrogen and oxygen mixing component, propane igniter, combustion barrel, and temperature and time recorders, which is especially suitable for the samples without solid shape, and supplies with the oxygen index number and the combustion temperature-time curve. The oxygen index number is determined based on the combustion temperature rather than combustion phenomena. What we should mention is the applicability for the materials difficult to be ignited at the oxygen content of even greater than 80 %. Therefore, the improved tester can adapt to a variety of samples and offer more results on more scientific bases. The new oxygen index tester can be particularly used for the experimental teaching and the laboratory research activity.