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Study on Poly(urethane-urea) Elastomers as Sealing Material for Tunneling Boring Machine’s Main Drive
- Acta Polymerica Sinica Vol. 54, Issue 12, Pages: 1857-1869(2023)
- 作者机构：
中国科学院兰州化学物理研究所 固体润滑国家重点实验室 兰州 730000
- 作者简介：
Yao-ming Zhang, E-mail: yaomingzhang@licp.cas.cn
- 基金信息：
DOI：10.11777/j.issn1000-3304.2023.23159
CLC：Published：20 December 2023，
Published Online：23 September 2023，
Received：12 June 2023，
Accepted：07 August 2023
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杨靖,李彦辉,陈守兵等.盾构机主驱动密封用聚氨酯脲弹性体密封材料的研究[J].高分子学报,2023,54(12):1857-1869.
Yang Jing,Li Yan-hui,Chen Shou-bing,et al.Study on Poly(urethane-urea) Elastomers as Sealing Material for Tunneling Boring Machine’s Main Drive[J].Acta Polymerica Sinica,2023,54(12):1857-1869.
杨靖,李彦辉,陈守兵等.盾构机主驱动密封用聚氨酯脲弹性体密封材料的研究[J].高分子学报,2023,54(12):1857-1869. DOI： 10.11777/j.issn1000-3304.2023.23159.
Yang Jing,Li Yan-hui,Chen Shou-bing,et al.Study on Poly(urethane-urea) Elastomers as Sealing Material for Tunneling Boring Machine’s Main Drive[J].Acta Polymerica Sinica,2023,54(12):1857-1869. DOI： 10.11777/j.issn1000-3304.2023.23159.
摘要
以聚四氢呋喃二醇(PTMEG)、甲苯2
4-二异氰酸酯(TDI)和3
3'-二氯-4
4'-二氨基二苯基甲烷(MOCA)为原料，通过使用不同含量的有机硅树脂(PDMS)对其改性，制备了4种浇注型聚氨酯脲弹性体(PUU-s). 系统地研究了PDMS的含量对聚氨酯脲弹性体力学性能、耐热性能、耐疲劳性能、可回复性能、耐介质性能以及摩擦学性能的影响. 结果表明，PDMS改性的PUU-s弹性体，不仅具有较高的机械性能，且具有优异的耐磨性和耐介质性以及较高的可回复性，可作为苛刻工况下的密封材料. 其有望作为盾构机主驱动密封用材料，提高了密封部件的长寿命服役，解决了磨损失效等问题.
Abstract
Four kinds of castable poly(urethane-urea) elastomers (PUU-s) were prepared by introducing different contents of hydroxy-terminated polydimethylsiloxane (PDMS) to the PUU
which was synthesized with polytetramethylene ether glycol (PTMEG)
2
4-diisocyanato-1-methylbenzene (TDI) and 4
4'-methylene-bis(2-chloroaniline) (MOCA). The effects of PDMS content on the mechanical properties
heat resistance
fatigue resistance
recoverability
dielectric resistance
and tribological properties of PUU-s were systematically studied. The results show the diamine used as curing agent reacted with ―NCO and yielded the urea group
which offer high density hydrogen bonding sites that allows the PUU elastomers to perform an excellent mechanical properties. The tensile strength
elongation at break and toughness of modified PUU-4 wt% elastomers are (36.6±1.3) MPa
(527.6±10.9)% and (88±4.7) MJ/m
3
respectively. While PDMS was introduced to the PUU through chemical bonding
the PDMS content affects the physico-chemical properties of the PUU. The transition temperature of PUU-s elastomer decreases from -24.3 ℃ to -26.4 ℃ with the increase of PDMS content. The lower surface energy of PDMS endows PUU-s elastomer with excellent heat resistance (
T
HRI
= 165.95 ℃) and hydrophobic properties (surface energy = 44.8 mN/m). In addition
due to the enrichment of PDMS on the surface of PUU-s elastomer
the wear loss and friction coefficients decreased from 0.074 cm
3
/1.61km and 0.2 to 0.022 cm
3
/1.61km and 0.05
respectively. The excellent anti-wear resistance is comparable to that of commercial high-performance thermoplastic polyurethane. Moreover
the poly(urethane-urea) elastomer prepared in this study possesses excellent solvent resistance
the tensile strength remains (45.48±7.3) MPa even after long-term immersion in 80 ℃ water
which indicates the long service life of our PUU elastomer as sealing material. On one hand
the flexibility of PDMS could reduce the intramolecular friction
on the other hand
the dynamic dissociation and recombination of high-density hydrogen bonds consumes partially solve the friction heat accumulation caused wear and sealing failure. Therefore
the PUU synthesized here can be used as a sealing material under harsh conditions
such as the sealing material for the main drive of the tunneling boring machine.
关键词
聚氨酯脲摩擦学性能有机硅树脂密封材料
Keywords
Poly(urethane-urea)Tribological propertiesSilicone resinSealing materials
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