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《合成橡胶工业》[ISSN:1000-1255/CN:62-1036/TQ]

期数:

2023年3期

页码:

255-255

栏目:

出版日期:

2023-05-15

文章信息/Info

Title:

Preparation and application of carbon nanotubes/conductive carbon black/ethylene-propylene-diene rubber composite

文章编号:

1000-1255（2023）03-0248-07

作者:

吴玲玲; 王雪飞; 黄良平

株洲时代新材料科技股份有限公司 轨道交通事业部，湖南 株洲 412007

Author(s):

WU Ling-ling?鄢;  WANG Xue-fei;  HUANG Liang-ping

Rail Transportation Business Unit, Zhuzhou Times New Material Technology Co Ltd, Zhuzhou 412007, China

关键词:

碳纳米管; 导电炭黑; 三元乙丙橡胶; 体积电阻率; 力学性能

Keywords:

-

分类号:

-

DOI:

DOI:10.19908/j.cnki.ISSN1000-1255.2023.03.0255

文献标识码:

-

摘要:

使用与导电橡胶基体具有良好相容性的固体三元乙丙橡胶（EPDM）和液体EPDM作为载体，将导电炭黑（CCB）和碳纳米管（CNTs）预先分散于固体EPDM和液体EPDM，制得的混合物直接替代常规导电橡胶配方中的导电填料和增塑剂，并与EPDM生胶及其他助剂混炼硫化，制备了EPDM导电橡胶材料，并考察了CNTs用量对硫化胶性能的影响。结果表明，导电填料经预分散可以改善其在导电橡胶中的分散性；当CCB和CNTs用量相同时，与未经预分散的导电填料相比，由预分散导电填料制得的硫化胶的体积电阻率更小、拉伸强度和撕裂强度更大；随着CNTs用量的增加，硫化胶的体积电阻率先减小而后降幅趋缓，拉伸强度和撕裂强度则持续增加。

Abstract:

Addition of conductive fillers such as conductive carbon black (CCB) and carbon nanotubes (CNTs) could significantly improve the electrical conductivity of rubber. However, that would result in the deterioration of processing properties for rubber compound and the rapid increase in hardness of vulcanizates, which affected seriously the preparation of conductive rubber composites and thus limits the application in the field of flexible conductive rubber materials. Plasticizer such as paraffin oil was usually utilized to reduce the hardness of conductive vulcanizates, accompanied by strength reduction.　In this paper, conductive fillers were pre-dispersed in solid rubber and liquid rubber, which had good compatibility with rubber matrix of conductive vulcanizates. Conductive fillers and plasticizer were directly replaced by the above composite. It aimed to achieve good electrical conductivity and flexibility together with improved strength of vulcanizates. Firstly, CCB and CNTs were mixed well with solid ethylene-propylene-diene monomer (EPDM) and liquid EPDM. EPDM matrix was masticated and then mixed with the aforementioned composite and the rest of reagents. Finally, rubber compounds obtained above were vulcanized to prepare vulcanizates.　Scanning electronic microscope (SEM) micrographs of conductive vulcanizates were shown in Fig 1. The pre-mixed conductive fillers were uniformly dispersed in matrix of conductive vulcanizates, while those without pre-mixing had poor dispersion. This might be due to good compatibility between rubber matrix of conductive vulcanizates and rubber carrier of solid EPDM and liquid EPDM, in which conductive fillers were pre-dispersed well. It was of benefit to further improvement of conductive filler dispersion in rubber matrix during compound mixing process. Volume resistivity (ρv) of vulcanizates decreased initially with increasing CNTs dose [up to 1.5 phr (mass, similarly hereinafter)] and tended to level off afterward (Fig 2). The improvement of electrical conductivity resulted from the formation of conductive network consisting of CCB and CNTs. Tensile strength and tear strength of vulcanizates increased with increasing CNTs dose (Fig 3). It might be attributed to the synergistic reinforcing effect of CCB and CNTs, which meant that rubber composite could withstand more stress. For the conductive vulcanizate with CCB of 25 phr and CNTs of 1.5 phr with pre-mixing, shore A hardness, ρv, tensile strength and tear strength were 63, 223 Ω·cm, 15.3 MPa and 44 kN/m, respectively, much better than those of the vulcanizate without pre-mixing (68, 1.1×105 Ω·cm, 11.5 MPa and 32 kN/m, respectively). The results indicated that conductive fillers well-dispersed in rubber carrier could significantly improve electrical conductivity and strength of vulcanizates, mainly due to better dispersion of pre-mixed conductive fillers and thus more complete conductive network as well as better synergistic reinforcing effect.

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更新日期/Last Update: 1900-01-01