紫外老化对双酚A型环氧树脂综合性能影响  

Effect of UV Aging on Comprehensive Properties of Bisphenol A Epoxy Resin

作　　者：刘杰 贾伯岩 田霖 孙钰[2] 郑雄伟 张志猛 尹晓宇 刘贺晨[2] LIU Jie;JIA Bo-yan;TIAN Lin;SUN Yu;ZHENG Xiong-wei;ZHANG Zhi-meng;YIN Xiao-yu;LIU He-chen(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University,Baoding 071003,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021 [2]华北电力大学河北省输变电设备安全防御重点实验室,保定071003

出　　处：《科学技术与工程》2022年第20期8701-8707,共7页Science Technology and Engineering

基　　金：国网河北省电力有限公司科技项目(kj2020-057);中央高校基本科研业务费专项资金(2020MS088)。

摘　　要：为了研究紫外线对环氧树脂及其复合材料的影响,以双酚A型环氧树脂为研究对象,利用氙灯老化箱对双酚A型环氧树脂进行加速老化试验,研究了紫外老化对其电气、力学及热学性能的影响。实验结果表明:经28 d紫外老化后,热分解后的质量残余减少,这是由于紫外及热的作用使得部分区域的环氧树脂由原先的致密网络结构转换为游离的自由基,形成了局部的缺陷。对力学性能的测试结果显示样品的弯曲强度下降至原有强度的74%,拉伸强度下降至原有强度的79%,说明老化后的双酚A型环氧树脂出现了局部的微观缺陷导致其承受外力破坏的能力有所减弱,但仍保持有较高的力学强度;对电气性能的测试结果显示样品的击穿场强下降14.8%,介质损耗因数上升12.7%。经紫外老化后,环氧树脂的热学、力学及电气性能均有一定程度的下降,但整体上性能下降程度不大,说明双酚A型环氧树脂具有一定的耐紫外老化性能。In order to study the effect of ultraviolet on epoxy resin and its composites,bisphenol A epoxy resin was taken as the research object.The accelerated aging test of bisphenol A epoxy resin was carried out in xenon lamp aging box,and the effects of ultraviolet aging on its electrical,mechanical and thermal properties were studied.The experimental results show that after 28 days of UV aging,the mass residue after thermal decomposition decreases.This is because the effect of UV and heat makes the epoxy resin in some areas convert from the original dense network structure to free radicals,forming local defects.The test results of mechanical properties show that the bending strength of the sample decreases to 74%of the original strength and the tensile strength decreases to 79%of the original strength,indicating that the aging bisphenol A epoxy resin has local micro defects,resulting in the weakening of its ability to withstand external force damage,but still maintains a high mechanical strength.The test results of electrical properties show that the breakdown field strength of the sample decreases by 14.8%and the dielectric loss factor increases by 12.7%.After UV aging,the thermal,mechanical and electrical properties of epoxy resin decreases to a certain extent,but the overall performance decreases little,indicating that bisphenol A epoxy resin has certain UV aging resistance.

关 键 词：环氧树脂 紫外老化 电气性能 力学性能 热学性能 

分 类 号：TM211[一般工业技术—材料科学与工程]