Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations  

作　　者：Zhenpeng Zhang Heyu Wang Zhonglei Li Jiankang Zhao Shaohua Wang Wenlin Pan Wenjie Li Te Li Boxue Du 

机构地区：[1]China Electric Power Research Institute,Wuhan,China [2]Key Laboratory of Smart Grid of Ministry of Education,School of Electrical and Information Engineering,Tianjin University,Tianjin,China [3]State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou,China [4]Hengtong Submarine Power Cables Co.,Ltd.,Changshu,China

出　　处：《High Voltage》2021年第2期230-241,共12页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:51707133;National Key Research and Development Program of China,Grant/Award Number:2016YFB0900701。

摘　　要：The repair joints of high-voltage cables play a significant role in the urgent cable main-tenance,by recovering cable conductor,insulation,shielding layer and waterproof layer especially for submarine cables.However,the molecule diffusion and permeation pro-cesses from waterproof sealant into the cable joint insulation occur,leading to the insulation ageing and deterioration.In this article,the molecule diffusion behaviours of six typical molecules from the asphalt-based and polyurethane-based waterproof sealants into silicone rubber insulation are investigated.The results show that the order of diffusion coefficients is as follows,phenanthrene>fluoranthene>pyrene>benzo[k]fluoranthene>indeno[1,2,3-cd]pyrene>polyurethane(PU).The relative molecular mass and binding energy are pivotal factors affecting the diffusion behaviour,while there is a linear relationship between the logarithm of the diffusion coefficient and the ratio of binding energy to relative molecular mass.Besides,the rising ambient temperature in-creases the fraction of free volume of silicone rubber and decreases the binding energy,thus resulting in a higher diffusion coefficient and an enhanced permeation process of the asphalt-based sealant.In summary,the PU-based waterproof sealant,with a much lower permeability than the asphalt-based material,has a potential application in the waterproof layer for high-voltage submarine cable repair joints.

关 键 词：DIFFUSION INSULATION rubber 

分 类 号：TM215.2[一般工业技术—材料科学与工程]