导电性热塑性复合材料的研究

发布时间：2018-02-13 15:13

本文关键词： 镀镍碳纤维镀镍石墨粉挤出包覆工艺体积电阻率导电性能力学性能　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：导电复合材料是一种新型功能性复合材料,在国民经济众多领域中已得到广泛应用。随着科学技术的不断进步,导电复合材料已逐渐向航空航天、军工等高尖端领域扩展。由于这些领域对复合材料导电性能的要求越来越高,所以国内外研究者尝试采用不同的方法来制备具有更高导电性能和稳定力学性能的复合材料,以满足高导电领域的使用要求。本文选用了两种新型的导电填料一镀镍碳纤维和镀镍石墨粉,并以工程塑料PC/ABS为树脂基体,采用挤出电缆包覆工艺制备镀镍石墨粉/镀镍碳纤维/PC/ABS导电复合材料。系统地研究了镀镍碳纤维填充量,镀镍石墨粉填充量,注塑颗粒长度,注塑螺杆转速、保压压力等工艺参数及偶联剂等对该复合材料导电性能及力学性能的影响。在以上部分研究中,通过观察导电填料在树脂中分布的微观结构来解释相关因素对复合材料导电性的影响机理。具体研究内容及得到的结果如下：1、在制备该导电复合材料的过程中,分别改变了镀镍碳纤维含量和镀镍石墨粉含量,研究并分析了这两种导电填料对该复合材料体积电阻率(导电性能)和力学性能的影响。同时也研究了复合材料颗粒长度对该材料导电性能的影响。结果表明,在本实验条件下,随着镀镍碳纤维含量的增加,材料的导电性能和力学性能均呈上升趋势,而随着镀镍石墨粉含量的增加,材料的导电性能提高,力学性能下降。2、研究和分析了注塑机螺杆转速、注塑压力、保压压力等工艺参数对该复合材料体积电阻率(导电性能)的影响。结果表明,在本实验条件下,当螺杆转速、注塑压力和保压压力分别为140r/min、85MPa和64MPa时,该复合材料的导电性能最佳,体积电阻率为1.15Ω.cm。3、研究和分析了镀镍碳纤维经偶联剂KH560处理后对该复合材料体积电阻率及力学性能的影响。结果表明,在适当成型工艺条件下,经偶联剂处理的镀镍碳纤维对复合材料导电性能产生了一定的影响,但其对复合材料的力学性能没有明显的作用。
[Abstract]:Conductive composite is a new type of functional composite, which has been widely used in many fields of national economy. Because these fields require more and more conductive properties of composites, researchers at home and abroad try to use different methods to prepare composites with higher conductivity and stable mechanical properties. In order to meet the requirements of high conductivity field, two new conductive fillers, nickel-coated carbon fiber and nickel-coated graphite powder, were selected in this paper, and the engineering plastic PC/ABS was used as resin matrix. The nickel graphite powder / nickel coated carbon fiber / PC / ABS conductive composites were prepared by extrusion cable coating process. The filling amount of nickel coated carbon fiber, the filling amount of nickel coated graphite powder, the length of injection molded particles and the rotational speed of injection screw were systematically studied. The effects of pressure holding pressure and coupling agent on the conductive and mechanical properties of the composite. By observing the microstructure of the conductive filler in the resin, the influence mechanism of the related factors on the electrical conductivity of the composite is explained. The specific research contents and the results obtained are as follows: 1. In the process of preparing the conductive composite, The content of nickel-coated carbon fiber and nickel-coated graphite powder were changed respectively. The effects of the two kinds of conductive fillers on the bulk resistivity (conductivity) and mechanical properties of the composites were studied and the effects of particle length on the conductive properties of the composites were also studied. Under the experimental conditions, with the increase of the content of nickel-coated carbon fiber, the conductivity and mechanical properties of the materials increased, but with the increase of the content of nickel-coated graphite powder, the electrical conductivity of the materials increased. The effect of screw speed, injection pressure and pressure on the volume resistivity (electrical conductivity) of the composite is studied and analyzed. The results show that, under the experimental conditions, when the screw speed, When the injection pressure and the holding pressure are 140 r / min ~ 85 MPA and 64 MPA, respectively, the conductive properties of the composite are the best. The volume resistivity is 1.15 惟. Cm. 3. The effect of nickel coated carbon fiber treated by coupling agent KH560 on the volume resistivity and mechanical properties of the composite is studied and analyzed. The nickel-coated carbon fiber treated by coupling agent has a certain influence on the conductive properties of the composites, but it has no obvious effect on the mechanical properties of the composites.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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