橡胶衬里材料的老化性能  

Aging modification of rubber lining

作　　者：吴昉赟 张维 杜艳秋 程凤梅 李海东 WU Fangyun;ZHANG Wei;DU Yanqiu;CHENG Fengmei;LI Haidong(China Nuclear Power Operation and Management Co.,Ltd.,Haiyan 314300,China;College of Material and Textile Engineering,Jiaxing University,Jiaxing 314001,China)

机构地区：[1]中核核电运行管理股份有限公司,浙江海盐314300 [2]嘉兴大学材料与纺织工程学院,浙江嘉兴314001

出　　处：《弹性体》2024年第6期29-33,共5页China Elastomerics

基　　金：浙江省嘉兴市公益计划研究项目(2019AY11011)。

摘　　要：将橡胶衬里材料(天然橡胶/氯丁橡胶混合橡胶)浸入天然的海水中,在120℃条件下进行老化实验,对不同老化时间的试样进行力学性能、硬度等测试,采用红外光谱、扫描电子显微镜等手段分析材料的结构。结果表明,随着老化时间的增加,橡胶拉伸强度、弹性模量、断裂伸长率都呈现减少的趋势,拉伸性能存在一个缓台,在未达到特征老化时间的老化初期拉伸强度等性能略有提升,平衡点过后拉伸性能下降。当老化到312 h(13 d)时拉伸强度降低到原来的50%以下。橡胶的硬度随老化时间的延长而减小。随着老化时间的延长,主链发生断裂,双键含量减少,橡胶的微孔和微裂纹增多,橡胶与填料间的相互作用减弱,橡胶基体发生老化。The rubber lining material(natural rubber/chloroprene rubber blend) was immersed in natural seawater and subjected to an aging test at 120 ℃.The mechanical properties of the samples with different aging times were tested,and the structure of the material was analyzed by infrared spectroscopy and scanning electron microscopy.The experimental results showed that,the tensile strength,elastic modulus,and elongation at break of the rubber all decreased,as the aging time incresed.Moreover,a slow plateau in the tensile properties was found.In the initial aging period before the characteristic aging time was reached,the tensile strength and other properties were slightly improved,and the tensile properties decreased after the equilibrium point.When aged to 312 hours(13 days),the tensile strength was reduced to less than 50% of the original.The hardness of the rubber was decreased with the extension of aging time.With the extension of aging time,the main chain was broken,the double bond content was decreased,the micropores and microcracks of the rubber increased,the interaction between the rubber and the filler weakened,and the rubber matrix aged.

关 键 词：天然橡胶 氯丁橡胶 热氧老化 橡胶衬里 海水腐蚀 

分 类 号：TQ332[化学工程—橡胶工业] TQ333.5