ISSN   1004-0595

CN  62-1224/O4

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张彩霞, 王廷梅, 陈守兵, 张新瑞, 王齐华. 盾构机主驱动用丁腈橡胶密封材料的加工、力学及耐磨性能研究[J]. 摩擦学学报(中英文), 2024, 44(10): 1−9. doi: 10.16078/j.tribology.2023209
引用本文: 张彩霞, 王廷梅, 陈守兵, 张新瑞, 王齐华. 盾构机主驱动用丁腈橡胶密封材料的加工、力学及耐磨性能研究[J]. 摩擦学学报(中英文), 2024, 44(10): 1−9. doi: 10.16078/j.tribology.2023209
ZHANG Caixia, WANG Tingmei, CHEN Shoubing, ZHANG Xinrui, WANG Qihua. Processing, Mechanics and Wear Resistance Performance of Nitrile Rubber Sealing Material for Main Drive of Shield Machine[J]. Tribology, 2024, 44(10): 1−9. doi: 10.16078/j.tribology.2023209
Citation: ZHANG Caixia, WANG Tingmei, CHEN Shoubing, ZHANG Xinrui, WANG Qihua. Processing, Mechanics and Wear Resistance Performance of Nitrile Rubber Sealing Material for Main Drive of Shield Machine[J]. Tribology, 2024, 44(10): 1−9. doi: 10.16078/j.tribology.2023209

盾构机主驱动用丁腈橡胶密封材料的加工、力学及耐磨性能研究

Processing, Mechanics and Wear Resistance Performance of Nitrile Rubber Sealing Material for Main Drive of Shield Machine

  • 摘要: 盾构机主驱动密封件是1种大型异形橡胶密封件,橡胶材料的加工性能在其精细结构成型过程中发挥着举足轻重的作用,而焦烧时间和门尼黏度是影响橡胶材料加工性能的关键因素. 针对盾构机主驱动橡胶密封件的成型工艺对丁腈橡胶(NBR)加工性能的要求,本研究以松明油、癸二酸二丁酯和固体古马隆树脂为原料,合成复合增塑剂;并使用高结构炭黑和低结构炭黑并用的补强体系,对NBR密封材料进行加工性能、物理机械性能和摩擦性能的宏观调控. 研究结果表明,由于复合增塑剂中三组分的协同作用,当复合增塑体系中松明油的使用量为0.9 phr (parts per hundred parts of rubber,每百克橡胶中组份的含量)时,本研究制备的高性能NBR密封材料,不仅满足大型盾构机用异形密封圈的成型工艺要求,混炼胶焦烧时间T10可长达168.6 s,门尼黏度值ML(1+4)可低至46.95;还是1种兼具高强度、高韧性、高耐磨、高回复性与高耐热性的自润滑橡胶密封材料,且该材料的耐磨性能已在盾构机主驱动模拟试验台中进行了验证,可以满足盾构机主驱动系统对密封有效性和寿命的需求,本研究可以为大型盾构机主驱动密封材料的设计制备提供支撑.

     

    Abstract: Nitrile Butadiene Rubber (NBR) has polar nitrile group (-CN) and trans-1,4 structure in the molecular structure, with excellent oil resistance, heat resistance and wear resistance, widely used in aerospace, petrochemical, engineering machinery, pharmaceutical and vehicle equipment hydraulic seal, pneumatic seal and mechanical seal auxiliary sealing device. The severe working conditions of the main drive seal of large Shield Tunneling Machine are matched with the performance of NBR, and the wear resistance of NBR plays a crucial role in its sealing performance, and even directly determines the working life of the whole machine. The main drive seal material of Shield Tunneling Machine is a large special-shaped rubber seal, and the processing performance of rubber material plays an important role in its forming process its fine structure. The scorch time and Mooney viscosity are the key factors affecting the processing properties of rubber materials. According to the processing requirement of NBR for the main drive rubber seal of Shield Tunneling Machine, in this study, the compound plasticize was synthesized from pine tar, dibutyl sebacate and solid coumarone resin. The reinforcement system formed by high structure carbon black and low structure carbon black was used to control the processing performance, physical and mechanical properties and friction properties of NBR sealing materials. In this paper, the effects of different contents of pine oil in composite plasticizer on the processability, physical and mechanical properties and frictional properties of NBR composites were systematically studied. The results showed that pine oil could reduce the softening point of solid gumarone resin, and could effectively improve the elongation at break of rubber materials and enhance the flexibility of rubber materials due to the synergistic action of three components in the composite plasticizer. When the amount of pine oil used in the composite plasticizing system was 0.9 phr (parts per hundred parts of rubber), and the amount of high structure carbon black and low structure carbon black added in the reinforcing system was 45 phr and 15 phr, respectively, the high-performance NBR sealing material prepared in this study could not only meet the molding process requirements of special-shaped sealing ring for large shield tunneling machine, the scorch time T10 of the compound could be as long as 168.6 s, and the Mooney viscosity ML(1+4) could be as low as 46.95. It was also a self-lubricating rubber sealing material with high strength, high toughness, high-wearing feature, high recovery and high heat resistance. The tensile strength was as high as 22.51 MPa, while the elongation at break was 684.4%, the compression permanent deformation rate could be as low as 22.7% (100 ℃, 25% compression rate, 24 h), and the Akron wear value was as low as 0.1 cm3/1.61 km. The wear resistance of the material was also verified in the simulation test bench of the main drive of the shield machine, which could meet the requirements of the main drive system for sealing effectiveness and life. This study could provide support for the design and preparation of the main drive sealing material of large shield tunneling machine.

     

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