PVB/Al_2O_3导热绝缘复合材料的制备与性能研究  

Preparation and Property Study of Thermally Conductive and Electro Insulating PVB/Al_2O_3 Composites

作　　者：朱晓亮[1] 李光吉[1] 袁江勇[1] 王田甜[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《塑料工业》2012年第12期67-72,共6页China Plastics Industry

摘　　要：以聚乙烯醇缩丁醛(PVB)为基材,选用粒径分别为1～3μm、10μm和30 nm的Al2O3为导热填料,三乙二醇二-2-乙基己酸酯(3GO)为增塑剂,通过熔融共混法制备了PVB/Al2O3导热绝缘复合材料;研究了Al2O3的表面处理、添加量和粒径对复合材料的导热绝缘性能和力学性能的影响。结果表明,在所考察的三种表面处理剂γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷(KH-560)、钛酸正丁酯(TC)和硬脂酸(SA)及其用量范围内,用质量分数为1.0%的KH-560对Al2O3粒子进行表面处理是较佳的处理方法;在三种粒径不同的Al2O3导热填料中,粒径1～3μm的Al2O3较有利于改善PVB/Al2O3复合材料的导热性能;PVB/Al2O3复合材料的热导率随Al2O3用量的增加而升高;当1～3μm的Al2O3用量为85 phr,即体积分数为18.6%时,复合材料的热导率为0.407 W/(m.K),是不含Al2O3的PVB的1.91倍;当这一Al2O3的用量为70 phr(体积分数15.9%)时,所制得的PVB/Al2O3复合材料具有较好的综合性能,其热导率为0.375 W/(m.K),体积电阻率为1.65×1012Ω.m,拉伸强度为21.4 MPa,断裂伸长率为265%。根据Agrai理论模型进行的数据分析表明,当Al2O3用量大于25 phr(体积分数6.3%)时,随着Al2O3用量的进一步增加,PVB/Al2O3复合材料中的Al2O3粒子形成了部分连续的导热链。The thermally conductive and electroinsulating PVB/AI203 composites were prepared by melt blending using polyvinyl butyral （PVB） as a matrix and triethylene glycol di-2-ethylhexoate （3GO） as a plasticizer and the particle size of alumina （Al2O3 ） used in PVB/Al2O3 composites as a thermally conductive filler was 1 -3 um, 10 um and 30 nm, respectively. The effects of the surface treatment of Al2 O 3 , Al2 O 3 content and particle size were systematically studied on the heat conduction performance, electro insulating property and the mechanical property of the PVB/Al2O3 composites. The experimental results showed that among the examined three kinds of surface treatment agents, y-glycidoxypropyltrimethoxysilane （KH-560）, titanium tetrabutoxide （TC） and stearic acid （SA）, and in their dosage range, treating Al2 O3 with 1.0 wt%of KH-560 was an optimum surface treatment approach; in the used three kinds of Al2O3 fillers with different particle sizes, Al 2O 3 with the particle size of 1 to 3 um was more conductive to improving the thermal conductivity of PVB/Al2O3 composites; and the thermal conductivity of PVB/Al2O3 composites increased with an increase in the Al2O3 content. When the Al2O3 content was 85 phr or 18.6 vol%, the thermal conductivity of the PVB/Al2O3 composite was 0. 407 W/m · K, which was 1.91 times of that of the PVB sample without Al2O3. And when the Al2O3 content was 70 phr or 15.9 vol%, the prepared PVB/Al2 O 3 composite can exhibit good comprehensive performance, whose thermal conductivity, volume resistivity, tensile strength and elongation at break were 0. 375 W/（m · K）, 1.65 × 10 ^12 Ω . m, 21.4 MPa and 265% , respectively. The data analysis based on the theoretical model of Agrai indicate that with a further increasing Al2O3 content when it was higher than 25 phr or 6.3 vol%, the Al2O3 particles in the PVB/Al2O3 composites can form the partly continuous heat conduction chains.

关 键 词：聚乙烯醇缩丁醛 聚乙烯醇缩丁醛 氧化铝复合材料 热导率 氧化铝粒子 电绝缘性 

分 类 号：TB331[一般工业技术—材料科学与工程]