中国塑料 ›› 2022, Vol. 36 ›› Issue (11): 94-100.DOI: 10.19491/j.issn.1001-9278.2022.11.014

• 加工与应用 • 上一篇    下一篇

过负荷故障聚氯乙烯铜导线绝缘材料热解行为变化研究

高鸽1(), 李阳2, 许洁2(), 王伟峰3, 李哲1   

  1. 1.中国人民警察大学研究生二队,河北 廊坊 065000
    2.中国人民警察大学物证鉴定中心,河北 廊坊 065000
    3.西安科技大学安全科学与工程学院,西安 710054
  • 收稿日期:2022-08-02 出版日期:2022-11-26 发布日期:2022-11-25
  • 通讯作者: 许洁(1983—),女,讲师,从事火灾物证检验鉴定方面研究,756482991@qq.com
    E-mail:1635773730@qq.com;756482991@qq.com
  • 作者简介:高鸽(1998—),女,在读硕士研究生,从事电气火灾调查研究,1635773730@qq.com
  • 基金资助:
    国家自然科学基金项目(52074213);河北省自然科学基金资助项目(E2021507002)

Influence of overloaded failure on thermal degradation characteristic of poly(vinyl chloride) copper wire insulation

GAO Ge1(), LI Yang2, XU Jie2(), WANG Weifeng3, LI Zhe1   

  1. 1.Squad two of Graduate Faculty,China People’s Police University,Langfang 065000,China
    2.Physical Evidence Appraisal Center,China People’s Police University,Langfang 065000,China
    3.College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054
  • Received:2022-08-02 Online:2022-11-26 Published:2022-11-25
  • Contact: XU Jie E-mail:1635773730@qq.com;756482991@qq.com

摘要:

以发生过负荷故障的聚氯乙烯(PVC)铜导线为研究对象,使用热重⁃红外光谱联用仪(TG⁃FTIR)对比分析了过负荷与未过负荷铜导线绝缘材料的热解特性差异;采用Flynn⁃Wall⁃Ozawa(FWO)法对绝缘材料的活化能进行求解,并结合红外光谱分析绝缘材料热解逸出气体种类,探究过负荷故障对铜导线绝缘材料热解特性的影响。结果表明,过负荷铜导线绝缘材料发生氧化热解放热的起始温度(408 ℃)低于未发生过负荷故障的铜导线(424 ℃),且发生氧化放热反应所需活化能(142.18 kJ/mol)远低于未发生过负荷铜导线(231.54 kJ/mol),表明过负荷故障会导致铜导线PVC绝缘材料更易发生氧化放热反应;过负荷故障会导致铜导线发生较为完全的脱HCl反应,致使故障导线起火燃烧后产生的腐蚀性HCl气体明显减少,同时其氧化放热反应温度变化范围较窄。

关键词: 聚氯乙烯铜导线, 过负荷, 热解特性, 活化能, 火灾危险性

Abstract:

An intensive investigation was carried out using thermogravimetric⁃infrared spectroscopy to evaluate the thermal degradation characteristic variation of poly(vinyl chloride) (PVC)⁃encapsulated copper wire after suffering from overloading compared to normal wire insulation materials. The activation energy of insulation materials were calculated using the Flynn⁃Wall⁃Ozawa method. The types of gases escaping from the pyrolysis of insulation materials were determined based on the infrared spectroscopy to explore the influence of overloaded failure on the thermal degradation characteristics of PVC insulation materials. The results indicated that the initial temperature of oxidation exothermic reaction of overloaded wire insulation material (408 ℃) was lower than that of normal wire insulation materials (424 ℃). In addition, the activation energy required by the oxidation exothermic reaction of the insulation materials for the overloaded wire (142.18 kJ/mol) was far lower than that of the normal wire (231.54 kJ/mol). This suggested that the overloaded wire insulation materials were prone to oxidation exothermic reaction compared to the normal wire insulation materials. The HCl removal reaction of PVC⁃based insulation materials during the failure⁃overloading process might result in a significant reduction in the corrosive HCl gas generated if the wire was burning. Meanwhile, the temperature range of the oxidation exothermic reaction became narrow.

Key words: poly(vinyl chloride) copper wire, overload, thermal degradation characteristic, activation energy, fire hazard

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