高绝缘性良好导热性低密度聚乙烯电缆绝缘材料的制备与性能

PDF全文下载：2015060655

张玉风， 辛萌， 苏明， 郝春成*

 (青岛科技大学 材料科学与工程学院，山东 青岛 266042)

 摘要： 采用密炼机熔融混炼法制备了纳米二氧化硅/低密度聚乙烯(SiO2/LDPE)复合材料和纳米氧化铝/低密度聚乙烯(Al2O3/LDPE)复合材料，并采用平板硫化机模压成型。通过场发射扫描电子显微镜(FESEM)观察断面分析其微观形貌。测试了纳米复合材料的耐直流高压击穿性能，电晕现象以及不同温度下的导热系数。结果表明：采用密炼机熔融混炼得到的LDPE基纳米复合材料体相分布均匀，两相兼容性良好；纳米粉体含量不同的复合材料相对纯LDPE耐直流高压击穿性能均明显提高，导热性能不但未降低反而提高较大，其中，质量分数2%的SiO2可以把击穿场强提高25%以上，同时可提高复合材料导热系数。纳米SiO2在提高复合材料绝缘性与导热系数方面效率更高。

关键词： 纳米复合材料； 绝缘强度； 导热系数； 电晕现象

中图分类号： TQ 325.1+2               文献标志码： A

 Preparation and Performance of High Insulativity and Good Thermal Conductivity LDPE Insulated Cable Material

 ZHANG Yufeng, XIN Meng, SU Ming, HAO Chuncheng

(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

 Abstract: NanoSiO2/low density polyethylene (SiO2/LDPE) composites and nanoAl2O3/low density polyethylene (Al2O3/LDPE) composites were prepared by melt compounding with internal mixer. These composite materials were moulded by press vulcanizer and the phase morphology was researched by field emission scanning electron microscope. DC highvoltage breakdown, electric corona and thermal conductivity in different temperature of these composite materials were studied. Experimental results indicated that nanoparticles were well distributed in these composite materials and the compatibility of two phase are very good; compared with pure LDPE sample′s performance, the DC highvoltage breakdown strength and thermal conductivity in different temperature of these composite materials were more better, especially, when the concentration of SiO2 is 2%, the DC highvoltage breakdown strength was improved by more than 25%, the thermal conductivity increased, also. NanoSiO2 is more effective in improving both thermal conductivity and insulativity of LDPE.

Key words: nanocomposite material; insulating strength; thermal conductivity; electric corona phenomenon

收稿日期： 20141125

基金项目： 国家自然科学基金资助项目(51077075).

作者简介： 张玉风(1988—),男,硕士研究生.    *通信联系人.

 文章编号： 16726987（2015）06065505； DOI： 10.16351/j.16726987.2015.06.012