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

doi:10.19491/j.issn.1001-9278.2022.11.014

Abstract

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

CLC Number:

TQ325.3

GAO Ge, LI Yang, XU Jie, WANG Weifeng, LI Zhe. Influence of overloaded failure on thermal degradation characteristic of poly（vinyl chloride） copper wire insulation[J]. China Plastics, 2022, 36(11): 94-100.

Figures/Tables 8

References 26

1	Vytenis Babrauskas. Mechanisms and modes for ignition of low⁃voltage， PVC⁃insulated electrotechnical products［J］. Fire and Materials， 2006，30（2）：151⁃174.
2	Zhi Wang， Jian Wang. A comprehensive study on the flame propagation of the horizontal laboratory wires and flame⁃retardant cables at different thermal circumstances［J］. Process Safety and Environmental Protection， 2020，139（2）：325⁃333.
3	舒中俊.热老化对YJV电缆绝缘护套塑料燃烧性能的影响［J］.中国塑料，2010，24（6）：55⁃57.
	SHU Z J. Effect of thermal aging on fire performance of YJV cable jacket insulation compound［J］. Chine Plastics， 2010，24（6）：55⁃57.
4	Cho Y S， Shim M J， Kim S W. Thermal degradation kinetics of PE by the Kissinger equation［J］. Materials Chemi⁃stry & Physics， 1998，52（1）：94⁃97.
5	Mo S J， Zhang J， Liang D， et al. Study on pyrolysis chara⁃cteristics of cross⁃linked polyethylene material cable［J］. Procedia Engineering， 2013，52（2）：588⁃592.
6	Wang C， Liu H， Zhang J， et al. Thermal degradation of flame⁃retarded high⁃voltage cable sheath and insulation via TG⁃FTIR［J］. Journal of Analytical and Applied Pyrolysis， 2018，134（9）：167⁃175.
7	Marcilla A， Beltrán M. Thermogravimetric kinetic study of poly（vinyl chloride） pyrolysis［J］. Polymer Degradation and Stability， 1995，48（2）：219⁃229.
8	罗希韬，王志奇，武景丽，等.基于热重红外联用分析的PE、PS、PVC热解机理研究［J］.燃料化学学报，2012，40（9）：1 147⁃1 152.
	LUO X T， WANG Q Z， WU J L， et al. Study on the pyrolysis mechanism of polyethylene， polystyrene， and polyvinyl chloride by TGA⁃FTIR［J］. Journal of Fuel Chemistry and Technology， 2021，40（9）：1 147⁃1 152.
9	Yao Zhongliang， Ma Xiaoqian. A new approach to transforming PVC waste into energy via combined hydrothermal carbonization and fast pyrolysis［J］. Energy， 2017，141（10）：1 156⁃1 165.
10	Ma Shibai， Lu Jun， Gao Jinsheng. Study of the low temperature pyrolysis of PVC［J］. Energy & Fuels， 2002，16（2）：338⁃342.
11	Xie Qiyuan， Zhang Heping， Lin Tong. Experimental study on the fire protection properties of PVC sheath for old and new cables［J］. Journal of Hazardous Materials， 2010，179（3）：373⁃381.
12	Wang Zhi， Wei Ruichao， Wang Xuehui， et al. Pyrolysis and combustion of polyvinyl chloride （PVC） sheath for new and aged cables via thermogravimetric analysis⁃fourier transform infrared （TG⁃FTIR） and calorimeter.［J］. Materials （Basel， Switzerland）， 2018，11（10）：1997.
13	Babrauskas V. SFPE handbook of fire protection enginee⁃ring （fifth edition）： electrical fires［M］. New York： Springer New Yorker Heidelberg Dordrecht London， 2016：662⁃664.
14	Di Blasi C， Branca C， Lombardi V， et al. Effects of particle size and density on the packed⁃bed pyrolysis of wood［J］. Energy & Fuels， 2013，27（18）：6781⁃6791.
15	Zhi Wang， Wei Ruichao， Ning Xiaoyao， et al. Thermal degradation properties of LDPE insulation for new and aged fine wires［J］. Journal of Thermal Analysis and Calorimetry， 2019，137（2）：461⁃471.
16	Artur Witkowski， Bertrand Girardin， Michael Försth， et al. Development of an anaerobic pyrolysis model for fire retardant cable sheathing materials［J］. Polymer Degradation and Stability， 2015，113（1）：208⁃217.
17	Yun Liu， Li Zhongfang， Wang Junsheng， et al. Thermal degradation and pyrolysis behavior of aluminum alginate investigated by TG⁃FTIR⁃MS and Py⁃GC⁃MS［J］. Polymer Degradation and Stability， 2015，118（4）：59⁃68.
18	徐亮.聚氯乙烯热解及火灾行为［J］.消防科学与技术，2014，33（7）：741⁃744.
	XU L. Investigation on thermal degradation and burning behavior of PVC［J］. Fire Science and Technology， 2014，33（7）：741⁃744.
19	Abhishek Bhargava， van Hees Patrick， Berit Andersson. Pyrolysis modeling of PVC and PMMA using a distributed reactivity model［J］. Polymer Degradation and Stability， 2016，129（4）：199⁃211.
20	马师白，殷剑君，鲁军，等.PVC的热解脱氯动力学分析［J］.环境化学，2001，20（2）：172⁃178.
	MA S B， YIN J J， LU J， et al. Kinetic analysis of PVC pyrolysis dichlorination［J］. Environmental chemistry， 2001，20（2）：172⁃178.
21	SoudaisYannick， Ludivine Moga， Jaroslav Blazek， et al. Coupled DTA⁃TGA⁃FT⁃IR investigation of pyrolytic decomposition of EVA， PVC and cellulose［J］. Journal of Analytical and Applied Pyrolysis， 2006，78（1）：46⁃57.
22	Miandad R， Barakat M， Aburiazaiza A S， et al. Catalytic pyrolysis of plastic waste： A review［J］. Process Safety & Environmental Protection， 2016，102（4）：822⁃838.
23	Jdsa B， Yan D， Sis A. A quantitative comparison of the pyrolysis and combustion behavior of plasticized and rigid poly （vinyl chloride） using two⁃dimensional modeling［J］. Fire Safety Journal，2020， 111：102910.
24	汤元君，李璇，董隽，等.废弃PVC塑料热解过程多尺度反应动力学特性研究［J］.中国塑料，2022，36（5）：89⁃98.
	TANG Y J， LI X， DONG J， et al. Multiscale thermogravimetric kinetics of waste polyvinyl chloride plastics［J］. China Plastics， 2022，36（5）：89⁃98.
25	田原宇，吕永康，谢克昌.PVC的热解/红外（Py/FTIR）研究［J］.燃料化学学报，2002， 6：569⁃572.
	TIAN Y Y， LV Y K， XIE K C. Application of Py/FTIR to pyrolysis of PVC［J］. Journal of Fuel Chemistry and Technology， 2002， 6：569⁃572.
26	张佳庆，过羿，冯瑞，等.典型变电站阻燃低压电缆外护套材料火灾条件下热解固气产物特性及反应机理［J］.清华大学学报（自然科学版），2022，62（1）：33⁃42.
	ZHANG J Q， GUO Y， FENG R， et al. Solid⁃gas produ⁃cts and reaction mechanism of pyrolysis of the sheath material of a typical flame⁃retardant low⁃voltage cable in substations during a fire［J］. Journal of Tsinghua University （Science and Technology），2022，62（1）：33⁃42.

样品	热解阶段	热解起始温度/℃	最大质量损失速率温度/℃	热解终止温度/℃	质量损失率/%	最大质量损失速率/%·min^-1
未过负荷	第一阶段	188	286.1	342.0	60.16	-18.48
未过负荷	第二阶段	424	502.5	549.7	17.27	-5.93
过负荷	第一阶段	234	279.1	341.0	44.81	-15.67
过负荷	第二阶段	408	496.3	546.0	27.89	-5.21

样品	热解阶段	热解起始温度/℃	最大质量损失速率温度/℃	热解终止温度/℃	质量损失率/%	最大质量损失速率/%·min^-1
未过负荷	第一阶段	188	286.1	342.0	60.16	-18.48
未过负荷	第二阶段	424	502.5	549.7	17.27	-5.93
过负荷	第一阶段	234	279.1	341.0	44.81	-15.67
过负荷	第二阶段	408	496.3	546.0	27.89	-5.21

转化率	未过负荷材料		过负荷材料
转化率	第一阶段	第二阶段	第一阶段	第二阶段
平均活化能	140.59	231.54	131.45	142.18
0.1	98.93	338.29	101.26	124.46
0.2	114.73	319.75	116.89	160.79
0.3	143.83	277.93	130.78	184.99
0.4	150.48	229.88	135.77	155.14
0.5	149.98	194.96	137.26	136.59
0.6	149.81	188.97	137.51	132.61
0.7	149.90	182.82	138.76	129.86
0.8	150.15	178.50	139.76	127.79
0.9	157.46	172.76	145.08	127.45

转化率	未过负荷材料		过负荷材料
转化率	第一阶段	第二阶段	第一阶段	第二阶段
平均活化能	140.59	231.54	131.45	142.18
0.1	98.93	338.29	101.26	124.46
0.2	114.73	319.75	116.89	160.79
0.3	143.83	277.93	130.78	184.99
0.4	150.48	229.88	135.77	155.14
0.5	149.98	194.96	137.26	136.59
0.6	149.81	188.97	137.51	132.61
0.7	149.90	182.82	138.76	129.86
0.8	150.15	178.50	139.76	127.79
0.9	157.46	172.76	145.08	127.45

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