影响氧指数测定准确性的因素和解决办法
2023-08-13金富
【摘要】随着我国城市化的高速发展,我国的大城市群,如长江中游城市群、哈长城市群、成渝城市群、长江三角洲城市群等在国家经济生活中扮演着重要的角色。城市化带来的现代化高层建筑使得都市生活变得越来越拥挤,同时发生火灾的风险也越来越大。随着全社会对消防安全的关注,阻燃材料利用其自身不易燃烧的特性被越来越多的应用在建筑材料中。氧指数试验是分析建筑材料阻燃性能的一项关键数据,通过对阻燃材料氧指数测定影响因素的研究可对降低氧指数试验结果的误差和阻燃材料的燃烧性能提升起到一定的作用。
【关键词】氧指数;环境因素;设备因素;试件制备;燃烧性能
【DOI编码】10.3969/j.issn.1674-4977.2023.04.042
【基金项目】辽宁省市场监督管理局科技计划项目《高温氧指數测定在保温材料阻燃性能研究中的应用》(2022ZC011)。
Factors Affecting the Accuracy of Oxygen Index Determination and Solutions
JIN Fu
(Liaoning Inspection, Examination & Certification Centre, Shenyang 110036, China)
Abstract: With the rapid development of urbanization,major urban agglomerations such as the middle reaches of the Yangtze River, Harbin-Changchun, Chengdu-Chongqing and Yangtze River Delta agglomerations play important roles in the economic life of our country. Modern high-rise buildings brought about by urbanization have made urban life increasingly crowded and the risk of fire is also increasing. With the attention of the whole society to fire safety, flame-retardant materials are increasingly used in building materials by virtue of their non-combustible characteristics. Oxygen index test is a key data to analyze the flame retardancy of building materials. The research on the influencing factors of oxygen index measurement of flame retardant materials can reduce the error of oxygen index test results and improve the combustion performance of flame retardant materials.
Key words: oxygen index; environmental factor; equipment factor; test material preparation; combustion performance
氧指数测定试验是判定塑料制品特别是建筑材料阻燃性能的重要指标,该种试验方法能够真实有效的反映出材料的阻燃性能,并根据材料的阻燃性能分析其使用场景。氧指数测定试验的原理是在理想的氧浓度环境下,引燃试件并根据试件的燃烧长度以及燃烧时间两项指标判断其燃烧特性。举例说明如果试件在较高的氧浓度环境下仍然不满足燃烧条件,代表试件具有较好的阻燃性能。相反如果试件在较低的氧浓度环境仍然符合燃烧条件,代表试件的阻燃性能较差易于燃烧。氧指数测定试验作为一种依靠特定环境下氧浓度来对试件进行判定的试验同时易受到诸如环境因素、设备因素、操作因素等的影响,产生误差进而影响材料燃烧性能分级的判定。……
