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  被引量:6

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

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作  者:张玉风[1] 辛萌[1] 苏明[1] 郝春成[1] 

机构地区:[1]青岛科技大学材料科学与工程学院,山东青岛266042

出  处:《青岛科技大学学报(自然科学版)》2015年第6期655-659,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基  金:国家自然科学基金资助项目(51077075)

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(SiO_2/LDPE)复合材料和纳米氧化铝/低密度聚乙烯(Al_2O_3/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SiO_2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SiO_2在提高复合材料绝缘性与导热系数方面效率更高。Nano-SiO_2/low density polyethylene(SiO_2/LDPE)composites and nanoAl_2O_3/low density polyethylene(Al_2O_3/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 SiO_2 is 2%,the DC high-voltage breakdown strength was improved by more than 25%,the thermal conductivity increased,also.Nano-SiO_2 is more effective in improving both thermal conductivity and insulativity of LDPE.

关 键 词:纳米复合材料 绝缘强度 导热系数 电晕现象 

分 类 号:TQ325.12[化学工程—合成树脂塑料工业]

 

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