ZnO在Al_2O_3_导热环氧树脂灌封胶中的应用研究_任凤梅
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热固性树脂Thermosetting Resin 第29卷第4期Vol.29No.42014年7月July 2014
ZnO 在Al 2O 3/导热环氧树脂灌封胶中的应用研究
任凤梅,黄艳娜,宋远周,周正发,徐卫兵
*
(合肥工业大学化工学院,安徽合肥230009)
摘要:采用硅烷偶联剂KH -560对ZnO 粉体表面改性,研究了ZnO 粒径及用量对Al 2O 3/导热环氧树脂灌封胶
导热系数、粘度、拉伸剪切强度、沉降率、触变指数、耐热性的影响。结果表明:表面改性后的ZnO 粉体颗粒分散均匀,无明显团聚现象;相同用量时,填充0.5μm ZnO 的树脂体系的综合性能较5μm ZnO 体系好。随ZnO 用量的增加,灌封胶的导热系数、拉伸剪切强度、触变指数均呈先增大后减小的趋势,ZnO 添加质量分数为20%时灌封胶导热系数、拉伸剪切强度最大,分别为0.84W /(m ·K )、16.78MPa ,ZnO 添加质量分数为60%时触变指数最大为1.89。随ZnO 用量的增加灌封胶的粘度、耐热性均逐渐增大,沉降率逐渐降低。关键词:氧化锌;三氧化二铝;环氧树脂;灌封胶;导热系数;拉伸强度;触变指数;耐热性中图分类号:TQ323.5
文献标识码:A
文章编号:1002-7432(2014)04-0034-04
【收稿日期】2014-01-02;【修回日期】2014-01-15
【作者简介】任凤梅(1980—),女,安徽省蚌埠市人,硕士,从事高分子材料加工改性的研究。
*通讯联系人,E -mail :xwb105105@
Study on the application of ZnO in Al 2O 3-filled thermal conductivity epoxy pottings
REN Feng -mei ,HUANG Yan -na ,SONG Yuan -zhou ,ZHOU Zheng -fa ,XU Wei -bing *
(College of Chemical Engineering ,Hefei University of Technology ,Hefei 230009,China )
Abstract :The ZnO powder surface was modified by silane coupling agent KH -560.The effects of ZnO particle size and amount on the thermal conductivity ,viscosity ,tensile shear strength ,sedimentation rate ,thixotropic index and heat resistance of Al 2O 3/thermally conductive epoxy pottings were studied .The results showed that the surface -modified ZnO powder particles were dispersed evenly without obvious agglomeration.The overall performance of the resin system filled 0.5μm ZnO better than 5μm ZnO system as the same filler amount .The thermal conduc-tivity ,tensile shear strength and thixotropic index of epoxy pottings showed a decreasing trend after the first increa-ses with the increasing of ZnO amount .The thermal conductivity and tensile shear strength of epoxy pottings with 20wt%ZnO reached the maximum 0.84W /(m ·K )and 16.78MPa ,respectively.The thixotropic index of pottins with 60%ZnO was 1.89and reached the maximum.With the increasing of ZnO amount ,the viscosity and heat re-sistance of pottings were gradually increased and sedimentation rate was decreased.
Key words :zinc oxide ;aluminum oxide ;epoxy resin ;potting ;thermal conductivity ;tensile strength ;thixotropic index ;heat resistance
0引言
环氧树脂具有优异的电学、粘结、耐化学腐蚀等性能
[1]
,可以作为胶粘剂、涂料、模压料、浇
注料、层压材料等,从日常生活用品到高技术领域,已应用到国民经济的各个方面[2]
。但纯环氧
树脂耐热性能差、导热系数低,无法满足某些特殊
场合的应用需求
[3]
,因此需加入活性稀释剂、导
热填料等对其进行改性以提高综合性能。
良好的导热环氧树脂灌封胶需符合以下几项基本要求:导热系数高、粘度低、不分层、在储存或
固化的过程中沉降率低、耐热性能好等
[4]
。Al 2O 3
填充环氧树脂灌封胶的导热系数高,但在储存过程中Al 2O 3粉体易沉降,导致环氧树脂灌封胶固化物各部分性能不均。Al 2O 3填充导热环氧树脂灌封胶还存在触变指数低、施工性能差的缺点。
本文以硅烷偶联剂KH -560对ZnO (氧化锌)
4
3DOI:10.13650/ki.rgxsz.2014.04.009