差速非对称双螺杆挤出制备高性能HDPE/h-BN导热复合材料  

Preparation of HDPE/h-BN Thermally Conductive Composites with High Performances via Non-twin Screw Extruder

作　　者：钟景浚 佘汉文 郭文帅 陈玉宇 徐百平 谈灵操 ZHONG Jingjun;SHE Hanwen;GUO Wenshuai;CHEN Yuyu;XU Baiping;TAN Lingcao(Jiangmen Key Laboratory of Polymer Intelligent Manufacturing at Wuyi University,School of Mechanical and Automation Engineering,Wuyi University,Jiangmen 529000,China)

机构地区：[1]江门市五邑大学高分子材料智能制造重点实验室,五邑大学机械与自动化工程学院,广东江门529000

出　　处：《塑料工业》2024年第4期104-109,164,共7页China Plastics Industry

基　　金：国家自然科学基金项目(11972023,12102306);广东省教育厅重点领域专项(2020ZDZX2051,2023ZDZX3039);广东省重点建设学科科研能力提升项目(2021ZDJS096);江门市科技计划项目(2023JC01026)。

摘　　要：电子元器件的飞速发展对电子设备的散热要求也越来越高。通过使用基于混沌混合原理的差速非对称双螺杆挤出机制备了高密度聚乙烯(HDPE)/六方氮化硼(h-BN)高导热复合材料,通过微观形貌、导热性能、力学性能等测试分析,研究了螺杆转速对h-BN的剥离与分散混合及其对HDPE/h-BN复合材料性能的影响。结果表明,转速的提升能够改善挤出机对h-BN的剥离分散效果,从而提高导热复合材料的综合性能。当转速为300 r/min时,平面内和平面外方向上的热导率分别达到了7.91和0.38 W/(m·K),与100 r/min时相比,分别提高了7.62%和15.15%,而拉伸强度和断裂伸长率分别提升了2.68%和81.63%。此方法工艺简单、生产效率高,且无需使用有害试剂,为高效规模化制备综合性能优异的高导热复合材料提供了新思路。The rapid development of electronic components also increases the heat dissipation requirements of electronic device.High density polyethylene(HDPE)/hexagonal boron nitride(h-BN)composites with high thermal conductivity were prepared by using the non-twin screw extruder based on chaotic mixing principle.The effects of the screw speed on the stripping and dispersion mixing of h-BN and the HDPE/h-BN composite properties were investigated by testing and analyzing the micro-morphology,thermal conductivity and mechanical properties.The results show that the increase of rotational speed can improve the stripping and dispersing effect of the extruder on h-BN,improving the comprehensive performances of the thermally conductive composites.When the rotational speed is 300 r/min,the thermal conductivity values in the in-plane and out-of-plane directions respectively reach 7.91 and 0.38 W/(m·K),which are increased by 7.62%and 15.15%compared with a rotational speed of 100 r/min.The tensile strength and elongation at break of the thermally conductive composites with a rotational speed of 300 r/min are respectively enhanced by 2.68%and 81.63%compared with a rotational speed of 100 r/min.This method has a simple process,high production efficiency and does not require the use of harmful reagents,which provides a new idea for the efficient and large-scale preparations of high thermal conductivity composite materials with excellent comprehensive properties.

关 键 词：导热复合材料 差速非对称双螺杆挤出机 螺杆转速 高密度聚乙烯 氮化硼 混沌混合 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]