Electrical and Environmental Aging of Silicone Rubber

硅橡胶的电气和环境老化

• 批准号: 11650278
• 负责人: YOSHIMURA Noboru
• 金额: $ 2.3万
• 依托单位: AKITA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650278/
• 关键词: UV radiation; corona discharges; acid rain; sources of the aging

This is a laboratory study on the aging of SIR and hydrophobicity recovery. UV radiation, corona discharges, acid rain, dry-band arcing are employed as sources of the aging. Chemical and morphological analysis is used to detect the surface chemical and structural changes derived from these stresses. The nature of highly mobile low molecular weight (LMW) chains achieving a quick recovery of the hydrophobicity is carefully examined. Their generation and extinction caused by these stresses are investigated.It is found that hydrophobic transfers of SIR resulting from electrical and environmental stresses are investigated as a clue to draw their aging scenarios and estimate their lifetimes. Roles of UV radiation, corona discharges and dry-band arcing during the aging is clearly identified. It is shown that oxidation that induces crosslinking, branching, interchanging in PDMS are the most dominant chemical reactions. Furthermore, highly mobile LMW chains (cyclic silicone oligomers of 4 to 6 … More molecular units) play a significant role to regain the hydrophobicity temporarily lost by electrical and environmental stresses. However, with the development of oxidation, silanol groups are formed, which are byproducts of oxidation, and they prevent highly mobile LMVV chains from migrating onto hydrophilic layers. Moreover, highly mobile LMW chains decrease due to crosslinking and their evaporation. When the recovery of SIR worsens, the above chemical reactions should take place. Hence, the atomic presence of oxygen at the surface can be a helpful indication to determine the aging level of SIR.However, in this case, ESCA able to analyze very shallow layer of material surfaces (<10 nm) would not be useful because mobile LMW chains hide the aged surfaces. EDX with high accelerating voltage to penetrate deeply into the sample (mere than 1 μm) would be convenient. The amount of cyclic silicone oligomers in the rubber is also significant information to predict the lifetimes. From all the information regarding their aging up to now, this study could draw a typical scenario of all lives of SIR used for outdoor HV insulation. This scenario proposed will be verified by the future test results of field aging. Less

这是一项关于SIR老化和疏水性恢复的实验室研究。紫外线辐射、电晕放电、酸雨、干带电弧是老化的来源。化学和形态分析被用来检测由这些应力引起的表面化学和结构变化。高流动性低分子量(LMW)链的性质，实现了疏水性的快速恢复被仔细研究。研究了由这些应力引起的SIR的产生和消亡，发现由电和环境应力引起的SIR的疏水转移被作为绘制它们的老化场景和估计它们的寿命的线索。紫外线辐射、电晕放电和干带电弧在老化过程中的作用被清楚地识别出来。结果表明，在PDMS中，引发交联、支化、交换的氧化是最主要的化学反应。此外，高流动性低分子链(4至6…的环状有机硅低聚物更多的分子单元)在恢复因电和环境压力而暂时丧失的疏水性方面起着重要作用。然而，随着氧化的发展，形成了硅醇基团，这些基团是氧化的副产物，它们阻止了高流动性的LMVV链迁移到亲水层上。此外，高迁移率的低分子链由于交联和蒸发而减少。当SIR的恢复情况恶化时，应发生上述化学反应。因此，氧原子在表面的存在可能是确定SiR老化程度的一个有用的指示。但是，在这种情况下，能够分析非常浅的材料表面层(&lt；10 nm)的ESCA将不会有用，因为移动的LMW链隐藏了老化的表面。用高加速电压的EDX对样品进行深度渗透(小于1μm)是很方便的。橡胶中的环状硅氧烷齐聚物的数量也是预测寿命的重要信息。从到目前为止有关SIR老化的所有信息，本研究可以绘制出SIR用于户外高压绝缘的所有生命的典型情景。提出的这一设想将得到未来现场老化试验结果的验证。较少

项目成果

S.Kumagai,M.Suzuki and N.Yoshimura: "Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests"電気学会論文誌A. 121巻・4号(掲載決定). (2001)

S. Kumagai、M. Suzuki 和 N. Yoshimura：“RTV 硅橡胶涂层在盐雾和旋转轮浸入测试中的电气性能”，IEEJ Transactions A，第 121 卷，第 4 期（已决定出版）。

X.Wang and N.Yoshimura: "Resistance to Tracking and Erosion of Silicone Rubber Material under Various Types of Precipitation"Jpn. J. Appl. Phys.. 38・3A. 5170-5175 (1999)

X.Wang和N.Yoshimura：“硅橡胶材料在各种类型的沉淀下的耐漏电起痕和侵蚀”Jpn. Phys. 38・3A (1999)

S.Kumagai, M.Suzuki and N.Yoshimura: "Material Screening and Evaluation for Silicone Rubber Insulation with Simple Methods"IEE of Japan. Vol.121, No.4(Submitted). (2001)

S.Kumagai、M.Suzuki 和 N.Yoshimura：“用简单方法进行硅橡胶绝缘材料的筛选和评估”日本 IEE。

N.Yoshimura and S.Kumagai: "Electrical and Environmental Aging of Silicone Rubber Used in Outdoor Insulation"IEEE Trans. on Dielectrics and Elect. Insul.. 6・5. 632-650 (1999)

N. Yoshimura 和 S. Kumagai：“户外绝缘中使用的硅橡胶的电气和环境老化”IEEE Trans. 电介质和绝缘。 6・5。

S.Kumagai, M.Suzuki and N.Yoshimura: "Electrical Performances of RTV Silicone Rubber Coatings in Salt-fog and Rotating Wheel Dip Tests"IEE of Japan. Vol.121, No.4(Submitted). (2001)

S.Kumagai、M.Suzuki 和 N.Yoshimura：“RTV 硅橡胶涂层在盐雾和转轮浸渍试验中的电气性能”日本 IEE。