碳纳米管/氮化硼水性涂料的制备与性能研究

Research on proparation and property of CNTs/BN aqueous coating

通过物理改性的方法提高碳纳米管的相容性,制备碳纳米管的水性分散液,将氮化硼粉体与碳纳米管分散液以及氟碳树脂乳液均匀混合,并通过砂磨机在高剪切力的作用下制得碳纳米管/氮化硼辐射散热涂料。通过对涂料的热导率、散热效果、附着力以及微观结构的检测。结果证明:涂料具有较好的散热、降温和附着力较优性能。在氮化硼用量为14%时,涂料热导率达到7.0W/(m·K),涂料的降温幅度为25.0%,涂料附着力等级为2级。

CNTs was modified by physical method to improve the compatibility then used to prepared aqueous dis- persion of CNTs. And BN and aqueous dispersion of CNTs were mixed with fluorocarbon resin emulsion, and grinded to prepare the CNTs/BN radiation head dissipation coating. The heat conductivity, heat dissipation effect,adhesion and micro structure of the product were researched which showed best performance when BN content of 5 %. And the microstructure showed double layers,CNTs in the surface and BN in the underlying which let the CNTs more efficient. Results showed that the coating had good heat radiation,cooling and adhesion. When the content of boron nitride was 14% ,coating thermal conductivity reached 7.0W/（M. K）, the cooling rate was 25 %, and the paint adhesion level was Level 2.