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紫外光交联低压EPDM电缆绝缘材料配方与性能

邵满智 赵洪 李春阳 杨旭 韩志东 岳振国

邵满智, 赵洪, 李春阳, 等. 紫外光交联低压EPDM电缆绝缘材料配方与性能[J]. 复合材料学报, 2021, 39(0): 1-12
引用本文: 邵满智, 赵洪, 李春阳, 等. 紫外光交联低压EPDM电缆绝缘材料配方与性能[J]. 复合材料学报, 2021, 39(0): 1-12
Manzhi SHAO, Hong ZHAO, Chunyang LI, Xu YANG, Zhidong HAN, Zhenguo YUE. Formulation and properties of UV crosslinked low voltage EPDM cable insulation material[J]. Acta Materiae Compositae Sinica.
Citation: Manzhi SHAO, Hong ZHAO, Chunyang LI, Xu YANG, Zhidong HAN, Zhenguo YUE. Formulation and properties of UV crosslinked low voltage EPDM cable insulation material[J]. Acta Materiae Compositae Sinica.

紫外光交联低压EPDM电缆绝缘材料配方与性能

基金项目: 国家自然科学基金 (基金号52107015)
详细信息
    通讯作者:

    李春阳,博士,讲师,硕士生导师,研究方向为电力电缆及其附件用聚合物绝缘材料 E-mail: lichunyang_hust@163.com

  • 中图分类号: TM215.2

Formulation and properties of UV crosslinked low voltage EPDM cable insulation material

  • 摘要: 为了将具有更高效率、更低功耗的紫外光交联技术用于三元乙丙橡胶(EPDM)电缆绝缘层生产,以达到节能减排、高效生产的目标,需研发低固体填料配方体系的EPDM绝缘材料。本文分别通过添加线性低密度聚乙烯(LLDPE)和少量纳米SiO2两种方法对EPDM进行补强。设计了可光交联的EPDM绝缘材料配方,并系统研究了紫外光交联EPDM材料的力学性能、交联性能、电学性能。结果表明,随着辐照时间的延长,EPDM力学性能明显下降,交联度迅速上升。与EPDM相比,LLDPE/EPDM材料交联程度和力学性能明显升高,当LLDPE含量为10wt%时,LLDPE/EPDM材料断裂伸长率为539%,拉伸强度为12 MPa,邵氏硬度为80 A,可以满足使用要求。对于SiO2/EPDM材料,当SiO2含量为4 phr(parts per hundreds of rubber)时,力学性能最优,断裂伸长率为596%,拉伸强度为14 MPa。与EPDM相比,SiO2/EPDM复合材料的硬度变化不大,但交联程度降低,当辐照时间为12 s时,延伸率为40%,但仍可满足使用要求。添加0.5 phr1010可以抑制材料辐照交联过程中的降解,复合材料的力学性能大幅度提升,同时可以为EPDM绝缘材料提供较好的耐热老化性能。两种适用于紫外光交联技术的EPDM电缆绝缘材料均可满足电缆绝缘使用要求。其中,LLDPE补强材料的交联度和电学性能更优,但是对材料的硬度影响较大,而SiO2对复合材料的硬度几乎没有影响,但是交联度与电学性能略有下降。

     

  • 图  1  西林电桥电路图

    Figure  1.  Circuit diagram of West Linn Bridge

    Rx—Sample resistance; Cx—Sample capacitance. R4—Fixed resistance; CN—Standard capacitance. R3—Adjustable resistance; C4—Adjustable capacitance.

    图  2  EPDM在不同辐照时间下力学性能

    Figure  2.  Mechanical properties of EPDM under different irradiation time

    图  3  LLDPE/EPDM复合材料力学性能

    Figure  3.  Mechanical properties of LLDPE/EPDM composites

    图  4  线性低密度聚乙烯(LLDPE)/EPDM复合材料硬度

    Figure  4.  Hardness of linear low density polyethylene (LLDPE)/EPDM composites

    图  5  SiO2/EPDM复合材料力学性能

    Figure  5.  Mechanical properties of SiO2/EPDM composites

    图  6  SiO2/EPDM复合材料SEM图像

    Figure  6.  SEM images of SiO2/EPDM composites

    图  7  SiO2/EPDM复合材料硬度

    Figure  7.  Hardness of SiO2/EPDM composites

    图  8  添加抗氧剂后各EPDM材料力学性能

    Figure  8.  Mechanical properties of each EPDM material after adding antioxidant

    图  9  老化前后各EPDM材料力学性能

    Figure  9.  Mechanical properties of each EPDM material before and after aging

    图  10  老化后EPDM颜色对比

    Figure  10.  Color contrast of EPDM after aging

    图  11  老化前后EPDM凝胶含量

    Figure  11.  EPDM gel content before and after aging

    图  12  添加1010后复合材料力学性能

    Figure  12.  Mechanical properties of compound material after adding 1010

    图  13  紫外光交联低压EPDM材料介电性能

    Figure  13.  Dielectric properties of UV crosslinked low voltage EPDM materials

    图  14  紫外光交联低压EPDM材料交流击穿场强Weibull分布

    Figure  14.  Weibull distribution of AC breakdown field strength of UV crosslinked low voltage EPDM materials

    表  1  三元乙丙橡胶(EPDM)电缆绝缘复合材料配比

    Table  1.   Ratio of ethylene propylene diene monomer (EPDM) cable insulation composite materials

    MaterialsEP
    DM/g
    LLD
    PE/g
    Nano
    SiO2/g
    BP/
    g
    TA
    IC/g
    10%LLDPE/EPDM36400.80.4
    20%LLDPE/EPDM32800.80.4
    30%LLDPE/EPDM281200.80.4
    40%LLDPE/EPDM241600.80.4
    2 phrSiO2/EPDM4000.80.80.4
    4 phrSiO2/EPDM4001.60.80.4
    6 phrSiO2/EPDM4002.40.80.4
    EPDM40000.80.4
    下载: 导出CSV

    表  2  低压EPDM绝缘材料的性能要求

    Table  2.   Performance requirements for low voltage EPDM insulating materials

    ProjectStandard requirements
    Tensile strength before aging/MPa≥5.0
    Elongation at break before aging/%≥250
    Thermal oxygen aging test:
    Tensile strength after aging/MPa≥4.2
    Maximum change rate of tensile strength /%±25
    Elongation at break after aging/%200
    Maximum change rate of elongation at break/%±25
    Thermal elongation /%≤100
    Permanent elongation/%≤25
    Shore hardness/A≤84
    Loss factor(tan δ)≤0.04
    Dielectric constant
    Breakdown strength/(kV·mm−1)≥25
    下载: 导出CSV

    表  3  EPDM在不同辐照时间下热延伸率

    Table  3.   Thermal elongation of EPDM under different irradiation time

    Irradiation
    time/s
    Thermal elongation/%Permanent elongation/%
    4Fuse
    8850
    12250
    下载: 导出CSV

    表  4  10%LLDPE/EPDM复合材料热延伸率

    Table  4.   Thermal elongation of 10%LLDPE/EPDM composites

    Irradiation
    time/s
    Thermal elongation/%Permanent elongation/%
    4Fuse
    8350
    12200
    下载: 导出CSV

    表  5  SiO2/EPDM材料热延伸率

    Table  5.   Thermal elongation of SiO2/EPDM composites

    Nano SiO2 content/phrThermal elongation/%Permanent elongation/%
    0250
    2350
    4400
    6400
    下载: 导出CSV

    表  6  EPDM材料抗氧剂配比与热延伸测试结果

    Table  6.   Test results of antioxidant ratio and thermal extension of EPDM materials

    The sample nameAntioxidant content/phrThermal elongation/%Permanent elongation/%
    4020/EPDM0.5Fuse
    300*/EPDM0.5110%30
    300/EPDM0.345%0
    1010/EPDM0.535%0
    1035/EPDM0.535%0
    下载: 导出CSV
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  • 收稿日期:  2021-10-21
  • 录用日期:  2021-12-02
  • 修回日期:  2021-11-26
  • 网络出版日期:  2021-12-31

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