长波紫外照射下高温硫化硅橡胶的微观物性及憎水性研究

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摘要在高温硫化（HTV）硅橡胶复合绝缘子广泛应用于高海拔地区特高压输电的形势下，研究HTV硅橡胶老化性能日显迫切。本文采用自行设计的可调式紫外老化试验箱对HTV硅橡胶进行了紫外照射加速老化实验，照射光波长为320~750nm，通过测试样品表面静态接触角评价其憎水性及变化，并利用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）以及X射线光电子能谱（XPS）等研究试样微观物性变化，进一步探讨了憎水性变化机理。研究结果表明：长波紫外照射后，HTV硅橡胶表面静态接触角下降，憎水性降低，这是由于长波紫外线切断硅氧主链两侧对称排列的Si-C键，促使侧链的非极性甲基基团发生氧化，导致其对硅氧键强极性的屏蔽作用减弱，大分子链极性增加，亲水性基团（-COOH）增加。另外，部分Si-C键断裂，生成的新自由基进一步交联和氧化，导致表面孔洞生成、填充物外露、平整度下降，这也是憎水性降低的一个重要原因。

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	覃永雄
	虞澜
	傅佳
	李国芳
	王勇
	郭文义
	杜小丽
	梁英

关键词 ：高温硫化, 硅橡胶, 长波紫外照射, 微观物性, 憎水性, 扫描电子显微镜, 傅里叶变换红外光谱, X射线光电子能谱

Abstract：With the wide application of high temperature vulcanization silicone rubber(HTV) composite insulators for ultra-high voltage transmission in high altitude area,it is urgent to study the aging properties of HTV silicone rubber. The adjustable ultraviolet aging experimental box designed by ourselves is used for the accelerated aging experiment of HTV silicone rubber,and the wavelength of radiation light ranges from 320nm to 750nm. The measure of static contact angle is used to evaluate the hydrophobicity. Scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS) are carried out to study the microscopic properties and further investigated the change mechanism of hydrophobicity. The result shows that static contact angles and hydrophobicity have decreased after long-wave ultraviolet radiation. The reasons are that long-wave ultraviolet radiation breaks Si-C bonds which are on both sides Si-O main chains with symmetrical arrangement,methyl groups are oxidized on the side chains,which lead that the shield of strongly polar of Si-O bonds is abated,the polar of macromolecular chains enhance,and hydrophilic groups(-COOH) increased. In addition,some Si-C bonds are cut off by ultraviolet irradiation,new free radicals are appeared and further crosslinked or oxidized,which lead to many voids are generated,fillers exposed and flatness declined on the surface of HTV silicone rubber. These are also the reasons that hydrophobicity is reduced.

Key words： High temperature vulcanization(HTV) silicone rubber long-wave ultraviolet radiation micros copic properties hydrophobicity SEM FTIR XPS

收稿日期: 2012-08-14 出版日期: 2015-01-22

PACS:	TM85
	TM215.2

基金资助:南方电网公司科技资助项目（k201016）。

作者简介: 覃永雄男，1987年生，硕士研究生，研究方向为高电压绝缘技术及光电子材料。虞澜（通信作者）女，1968年生，博士，教授，研究方向为光电子材料及高电压绝缘技术。

引用本文:

覃永雄，虞澜，傅佳，李国芳，王勇，郭文义，杜小丽，梁英. 长波紫外照射下高温硫化硅橡胶的微观物性及憎水性研究[J]. 电工技术学报, 2014, 29(12): 242-250. Qin Yongxiong,Yu Lan,Fu Jia,Li Guofang,Wang Yong,Guo Wenyi,Du Xiaoli,Liang Ying. Research on Microscopic Properties and Hydrophobicity of High Temperature Vulcanization Silicone Rubber under Long-Wave Ultraviolet Radiation. Transactions of China Electrotechnical Society, 2014, 29(12): 242-250.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I12/242

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