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碳纳米管对丁腈橡胶O型密封圈力学及其热稳定性能的影响

许泽华 张彦斌 何强

许泽华, 张彦斌, 何强. 碳纳米管对丁腈橡胶O型密封圈力学及其热稳定性能的影响[J]. 复合材料学报, 2023, 40(9): 5181-5188. doi: 10.13801/j.cnki.fhclxb.20230112.005
引用本文: 许泽华, 张彦斌, 何强. 碳纳米管对丁腈橡胶O型密封圈力学及其热稳定性能的影响[J]. 复合材料学报, 2023, 40(9): 5181-5188. doi: 10.13801/j.cnki.fhclxb.20230112.005
XU Zehua, ZHANG Yanbin, HE Qiang. Effect of carbon nanotubes on mechanical and thermal stability of nitrile rubber O-ring[J]. Acta Materiae Compositae Sinica, 2023, 40(9): 5181-5188. doi: 10.13801/j.cnki.fhclxb.20230112.005
Citation: XU Zehua, ZHANG Yanbin, HE Qiang. Effect of carbon nanotubes on mechanical and thermal stability of nitrile rubber O-ring[J]. Acta Materiae Compositae Sinica, 2023, 40(9): 5181-5188. doi: 10.13801/j.cnki.fhclxb.20230112.005

碳纳米管对丁腈橡胶O型密封圈力学及其热稳定性能的影响

doi: 10.13801/j.cnki.fhclxb.20230112.005
基金项目: 四川省科技计划项目(23 NSFSC1923)
详细信息
    通讯作者:

    何强,博士,教授,博士生导师,研究方向为特种橡胶密封件制备、测试与机制研究 E-mail:aystar@163.com

  • 中图分类号: TB333.7;TQ333.7

Effect of carbon nanotubes on mechanical and thermal stability of nitrile rubber O-ring

Funds: Sichuan Science and Technology Plan Project (23 NSFSC1923)
  • 摘要: 为了研究碳纳米管(CNT)对丁腈橡胶(NBR) O型密封圈的力学及热稳定性能补强机制,利用机械共混法和热压成型法制备了1%CNT/NBR (CNT质量比)和2%CNT/NBR复合材料的O型密封圈,在表征CNT/NBR复合材料的截面SEM、EDS和FTIR基础上,测试了CNT/NBR复合材料O型密封圈的力学性能、热稳定性能和老化性能。研究结果表明,随着CNT含量的增加,CNT/NBR复合材质O型密封圈的弹性模量增大,刚性增强。1%CNT/NBR材质O型密封圈由于C—O键的形成,使其拉伸强度达到12.6 MPa。CNT在NBR基体中含量的增加可以提高CNT/NBR复合材质O型密封圈的热稳定性,2%CNT/NBR的相转变温度达到297℃。1%CNT/NBR复合材料具有优异的抗老化特性归因于CNT使NBR基体产生C≡N三键官能团。高性能CNT/NBR复合材料O型密封圈在航空密封件领域有一定的应用价值。

     

  • 图  1  碳纳米管(CNT)/丁腈橡胶(NBR)复合材料O型密封圈

    Figure  1.  Carbon nanotubes (CNT)/nitrile rubber (NBR) composite O-ring

    D—Nominal outer diameter of the seal; d—Nominal inner diameter of the seal; d0—Cross-sectional diameter

    图  2  CNT及不同CNT质量比的CNT/NBR复合材料截面的SEM图像:(a) CNT;(b) NBR;(c) 1%CNT/NBR;(d) 2%CNT/NBR

    Figure  2.  SEM images of the cross-section of CNT/NBR composites with different CNT mass ratios: (a) CNT; (b) NBR; (c) 1%CNT/NBR;(d) 2%CNT/NBR

    图  3  CNT/NBR复合材料截面元素能谱

    Figure  3.  Element energy spectra of CNT/NBR composite cross-section

    图  4  CNT的FTIR图谱

    Figure  4.  FTIR spectrum of CNT

    图  5  NBR及CNT/NBR复合材料的FTIR图谱

    Figure  5.  FTIR spectra of NBR and CNT/NBR composites

    图  6  NBR及CNT/NBR复合材料的DSC曲线

    Figure  6.  DSC curves of NBR and CNT/NBR composites

    图  7  不同CNT含量O型密封圈的拉伸力-位移曲线

    Figure  7.  Tensile force-displacement curves of O-ring with different CNT content

    T—Tensile strength; E—Elongation at break

    图  8  不同CNT含量O型密封圈老化后的拉伸力-位移曲线

    Figure  8.  Tensile force-displacement curves of O-ring with different CNT content after aging

    图  9  不同CNT含量O型密封圈老化后的FTIR图谱

    Figure  9.  FTIR spectra of O-ring with different CNT content after aging

    表  1  GB 1235—76[24]丁腈橡胶O型圈尺寸

    Table  1.   GB 1235—76[24] nitrile rubber O-ring size

    D/d/mmd0/mmd1/mm
    65/60$ {3.12}_{-0.10}^{+0.12} $59.5±0.40
    Note: d1—Actual inner diameter.
    下载: 导出CSV

    表  2  不同CNT含量NBR复合材料O型密封圈的尺寸、硬度、拉伸强度及断裂伸长率

    Table  2.   Dimensions, hardness, tensile strength and elongation at break of NBR composite O-ring with different CNT content

    d0/mmC0/mmS0/mmShore A/HAT/MPaE/%
    NBR3.12186.369.476±112.1±0.7210.8±31.5
    1%CNT/NBR3.12186.869.478±112.6±1.1187.2±21.4
    2%CNT/NBR3.14187.469.480±1 9.8±1.8131.0±15.6
    Notes: C0—Inner circumference of O-ring; S0—Center distance of initial fixture; Shore A—Hardness.
    下载: 导出CSV

    表  3  不同CNT含量NBR复合材料O型密封圈老化后的尺寸、硬度、拉伸强度及断裂伸长率

    Table  3.   Dimensions, hardness, tensile strength and elongation at break of NBR composite O-ring with different CNT content after aging

    d0/mmC0/mmS0/mmShore A/HAT/MPaE/%
    NBR3.10184.669.482±113.2±0.5218.0±15.2
    1%CNT/NBR3.08186.269.483±217.3±0.4199.8±7.4
    2%CNT/NBR3.06185.969.484±110.2±0.9114.6±13.1
    下载: 导出CSV

    表  4  不同CNT含量NBR复合材料O型密封圈的恒定压缩永久变形结果

    Table  4.   Permanent deformation results of NBR composite O-ring with different CNT content under constant compression

    d1/
    mm
    d2/
    mm
    C1/
    %
    $\overline C _{\textit{1} }$/%
    NBR3.143.10 76.3
    3.163.07 6
    3.183.10 6
    1%CNT/
    NBR
    3.173.10 88.7
    3.163.0810
    3.153.08 8
    2%CNT/
    NBR
    3.213.11118.0
    3.153.10 5
    3.173.10 8
    Notes: d1—Cross-sectional diameter of the O-ring before compression; d2—Cross-sectional diameter of the O-ring after compression recovery for 24 h; C1—Constant compression set; $\overline C _{{1} } $—Average constant compression set.
    下载: 导出CSV
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  • 收稿日期:  2022-10-18
  • 修回日期:  2022-12-19
  • 录用日期:  2022-12-31
  • 网络出版日期:  2023-01-13
  • 刊出日期:  2023-09-15

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