核电用交联三元乙丙绝缘材料热氧老化状态的评估
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摘要
采用热氧老化法对核电用交联三元乙丙(EPDM)绝缘材料在180℃下进行不同时间的加速老化,对机械性能、绝缘性能、微观形貌、红外光谱等进行测试分析。结果表明:随着老化时间的增加断裂伸长率和拉伸强度呈下降趋势,硬度呈直线上升趋势;随着老化时间增加白度值下降;体积电阻率和介电强度在老化168h前呈现上升趋势,在168h后下降;SEM微观形貌分析显示老化前EPDM橡胶表面比较平整,随着老化时间增加,表面变得粗糙且有孔洞出现;红外光谱分析显示在3687cm~(-1)和1725cm~(-1)处羟基和羰基吸收峰的强度随着老化时间的增加而增大;2916cm~(-1)和2849cm~(-1)处吸收峰强度随着老化时间的增加而降低,峰宽随着老化时间的增加而逐渐增大。
The thermal oxygen aging method was used to accelerate the aging of crosslinked EPDM insulation materials for nuclear power at 180℃,and the mechanical properties,insulation properties,micro-morphology and infrared spectra were tested and analyzed. The results show that the elongation at break and tensile strength decrease with aging time,and the hardness increases linearly;the whiteness decreases with aging time;the volume resistivity and dielectric strength increase before 168 hours and decrease after 168 hours;SEM micro-morphology analysis shows that the surface of EPDM rubber is smooth before aging,and with aging time increasing,the surface of EPDM rubber becomes rough and voids appear. Infrared spectroscopy analysis shows that the absorption peaks of hydroxyl and carbonyl groups increase with aging time at 3687 cm~(-1) and 1725 cm~(-1). The absorption peak strength at 2916 cm~(-1) and 2849 cm~(-1) decrease with the increase of aging time,and the peak width increase with the increase of aging time.
The thermal oxygen aging method was used to accelerate the aging of crosslinked EPDM insulation materials for nuclear power at 180℃,and the mechanical properties,insulation properties,micro-morphology and infrared spectra were tested and analyzed. The results show that the elongation at break and tensile strength decrease with aging time,and the hardness increases linearly;the whiteness decreases with aging time;the volume resistivity and dielectric strength increase before 168 hours and decrease after 168 hours;SEM micro-morphology analysis shows that the surface of EPDM rubber is smooth before aging,and with aging time increasing,the surface of EPDM rubber becomes rough and voids appear. Infrared spectroscopy analysis shows that the absorption peaks of hydroxyl and carbonyl groups increase with aging time at 3687 cm~(-1) and 1725 cm~(-1). The absorption peak strength at 2916 cm~(-1) and 2849 cm~(-1) decrease with the increase of aging time,and the peak width increase with the increase of aging time.
引文
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[2] WU J-D,LiechtiK.Multiaxial and Time Dependent Behavior of a Filled Rubber [J].Mechanics of Time-Dependent Materials,2000,4(4):293-331.
[3] 梁诚.新型乙丙橡胶生产与应用进展[J].化工新型材料,2005,22(3):1-4.
[4] 肖琰,魏伯荣,杜茂平.橡胶加速老化试验及贮存期推算方法[J].合成材料老化与应用,2007,36(1):40-43.
[5] 方庆红,连永祥,赵桂林,等.基于BP人工神经网络的橡胶老化预测模型[J].合成材料老化与应用,2003,32(2):27-30.
[6] JaunichM,StarkW,Wolff D.A new method to evaluate the low temperature function of rubber sealing materials[J].Polymer Testing,2010,29(7):815-823.
[7] 李咏今.硫化橡胶热氧老化时物理机械性能变化规律的研究[J].特种橡胶制品,1997(01):44-53.
[8] 李咏今.橡胶老化性能变化或寿命预测的计算方法[J].合成材料老化与应用,1989,12(3):205-209.
[9] 赵泉林,李晓刚,高瑾.人工气候老化对三元乙丙橡胶性能与结构的影响[J].腐蚀与防护,2008(10):569-572.
[10] 赵泉林,李晓刚,高瑾.三元乙丙橡胶的人工气候老化[J].北京科技大学学报,2008,30(12):1422-1427.
[11] Flory P J,RabjohnN,Shaffer M C.Dependence of elastic properties of vulcanized rubber on the degree of cross linking [J].Journal of Polymer Science,1949,4(3):225-245.
[12] Paeglis A U.A simple model for prediction heat aging of EPDM rubber [J].Rubber Chemistry and Technology,2004,77(2):242-256.
[13] 孙彬,单永东,马芝森,等.交联方式对核电站用交联三元乙丙橡胶电缆料的影响[J].绝缘材料,2017,50(6):32-36.
[14] Gulmine J V,Akcelrud L.FTIR characterization of aged XLPE [J].Polymer Testing,2006,25(7):932-942.