A kind of preparation method of graphene/polyphenylene ether alloy heat conduction composite material

Abstract

The invention relates to a preparation method of a graphene / polyphenyl ether alloy heat-conducting composite material. The composite material comprises the following components by mass: 1-8 parts of graphene and 92-99 parts of polyphenyl ether alloy. The preparation method includes: dissolving a certain amount of polyphenyl ether alloy in a toluene / NMP mixed solution, adding a certain amount of graphene after the polyphenyl ether alloy is dissolved, carrying out ultrasonic dispersion to form a uniformly mixed solution, finally adding methanol into the mixed solution to precipitate the polyphenyl ether alloy, and carrying out suction filtration to obtain the graphene / polyphenyl ether alloy composite material. The method is simple in process, the adopted three solvents can be recycled in a simple distillation mode, and the boiling point of methanol is very low, therefore energy consumption is very small during recycling. Compared with the heat-conducting composite material added with traditional heat-conducting filler, the heat-conducting properties of the polyphenyl ether alloy composite material can be greatly improved by only a small amount of heat-conducting filler.

Description

technical field [0001] 本发明属于聚苯醚导热复合材料领域,特别涉及一种石墨烯 / 聚苯醚合金导热复合材料的制备方法,有效解决石墨烯在聚苯醚合金树脂中的分散性问题。 Background technique [0002] 聚苯醚是五大工程塑料中的一种,吸水率低,耐候耐热性,阻燃性好,介电性能极佳。但是聚苯醚的粘度大、流动性差、导热性能不佳并且在加入填料后其流动性会变得更差,这些都限制了其进一步的应用。 [0003] 石墨烯具有优异的光学、电学、力学特性,可应用于诸多领域,被认为是一种未来革命性的材料。虽然石墨烯有多种制备方法,包括化学气相沉积法、外延生长法、氧化还原法、碳纳米管切割法和物理剥离法等,但是除了物理剥离法,其它几种方法制备得到的石墨烯成本都十分昂贵。目前关于石墨烯的物理剥离法主要有液相剥离法、超临界二氧化碳剥离法、电化学剥离法以及机械球磨剥离法,虽然制得的石墨烯单层率较低,大多数都为少层石墨烯(3-10层),但是性能仍十分出色,具有广阔的工业应用前景。 [0004] 目前,绝大多数导热高分子复合材料都是通过添加大量导热填料从而使复合材料具有一定的热导率,然而过高的填充量严重影响高分子复合材料的流动性,尤其对于流动性能极差的聚苯醚基体树脂,添加大量导热填料更是使得聚苯醚导热复合材料的制备极其困难。此外,采用传统的双螺杆挤出熔融共混法制备高分子导热复合材料不利于导热填料在基体树脂中的分散,尤其是不利于石墨烯等比表面积大、密度小的导热填料在基体树脂中的分散,因此需要填充大量的导热填料从而使得复合材料具备一定的热导率,但大量的填充就会使得复合材料的机械性能大幅下降,同时严重降低复合材料的加工流动性,从而严重限制其工业应用。 Contents of the invention [0005] 本发明的目的在于提供一种新的制备石墨烯 / 聚苯醚合金导热复合材料的方法。 [0006] Technical scheme of the present invention is as follows: [0007] 一种石墨烯 / 聚苯醚合金导热复合材料的制备方法,其中复合材料包括以下质量份数的组分:石墨烯1-8份,聚苯醚合金92-99份,制备方法包括如下步骤: [0008] (1)将一定量的聚苯醚合金加入...

AI Technical Summary

Problems solved by technology

Although graphene has a variety of preparation methods, including chemical vapor deposition, epitaxial growth, redox, carbon nanotube cutting and physical exfoliation, the cost of graphene prepared by other methods is are very expensive

At present, the physical exfoliation methods of graphene mainly include liquid phase exfoliation method, supercritical carbon dioxide exfoliation method, electrochemical exfoliation method and mechanical ball milling exfoliation method. Although the graphene monolayer rate is low, most of them are few-layer graphite. ene (3-10 layers), but the performance is still very good, has broad industrial application prospects

[0004] At present, most thermally conductive polymer composite materials have a certain thermal conductivity by adding a large amount of thermally conductive fillers. However, too high a filling amount seriously affects the fluidity of polymer composite materials, especially for extremely poor fluidity. The addition of a large amount of thermally conductive fillers makes the preparation of polyphenylene ether thermally conductive composites extremely difficult.

In addition, the preparation of polymer thermally conductive composite materials by traditional twin-screw extrusion melt blending method is not conducive to the dispersion of thermally conductive fillers in the matrix resin, especially not conducive to the dispersion of thermally conductive fillers such as graphene with large specific surface area and low density in the matrix resin. Therefore, it is necessary to fill a large amount of thermally conductive fillers so that the composite material has a certain thermal conductivity, but a large amount of filling will greatly reduce the mechanical properties of the composite material, and at the same time seriously reduce the processing fluidity of the composite material, thereby severely limiting its performance. industrial application

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