Lifetime prediction of nitrile rubber under compression stress in transformer oil

Qian, Yihua; Xiao, Hong-zhao; Nie, Ming-Hao; Zhao, Yaohong; Yun-bai, Luo; Gong, Shu-ling

doi:10.2991/icmia-16.2016.35

Cited by 6 publications

(11 citation statements)

References 18 publications

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“…This observed increase in CS is attributed to the evaluation of the permanent deformation behavior in the samples, which arises due to scission and cross‐linking reactions during the thermo‐oxidative aging of elastomers. Scission reactions are responsible for cross‐linkage breaks, decreasing the viscoelastic recovery potential of the elastomer, and the cross‐linking reactions form new bonds in the deformed condition that also result in the loss of material recovery after decompression 9,10,13,18,19 …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the hardness values tend to increase with aging time, and the rate of increase in hardness is higher at more extreme temperature conditions. The loss of additives and the cross‐linking reactions, responsible for increasing hardness, predominate over scission reactions in both materials, which decrease the hardness of the material 6,9,12,17,21 …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the indentation results showed nonuniform oxidation at these same conditions due to oxidized layers formed on the surface, which influenced DLO effects and reduced the oxidation in the interior of the samples. Qian et al 9 conducted tests with NBR in oil to predict the lifetime of the material by the Arrhenius equation concerning elongation at break. These tests were carried out at 70, 90, and 110°C, for up to 55 days, by evaluating CS, hardness, FTIR, TGA, and differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

HNBR and NBR gasket rubbers for plate heat exchangers: Thermo‐oxidative aging and service lifetime prediction

de Ruijter,

de Bittencourt Ribeiro,

Zanzi

et al. 2023

J of Applied Polymer Sci

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Among several available rubbers used in gaskets for plate heat exchangers, the selection of the appropriate material for each operation window is crucial. This work evaluated nitrile butadiene rubber (NBR) and hydrogenated butadiene rubber (HNBR) gaskets aged at high temperatures for up to 60 days. The properties assessed of compression set (CS), hardness, and cross‐link density demonstrated superior degradation rates for the NBR specimens. Fourier transform infrared analysis showed that the hydrogenation process predominantly affected CC double bonds. Compress stress relaxation highlighted the impact of aging on the counterforce of rubber over time. Furthermore, indentation modulus profile analysis showed heterogeneous degradation for both materials at 140°C for NBR and 170°C for HNBR. The end‐of‐life criteria of 79% CS for both materials were determined through sealing tests of the aged samples. The service lifetime prediction, using the time–temperature superposition and Arrhenius methods through the CS evolution curves, demonstrated a higher degradation resistance of HNBR gaskets, that have a superior service lifetime of at least 3.5 times at 80°C concerning those of NBR, proving a superior behavior for the hydrogenated elastomer. In addition, the evaluation of the lifetime prediction enables the verification of which rubber gasket is recommended for each operational condition in terms of material cost, service lifetime, and maintenance costs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HNBR and NBR gasket rubbers for plate heat exchangers: Thermo‐oxidative aging and service lifetime prediction

de Ruijter,

de Bittencourt Ribeiro,

Zanzi

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…It would be possible to predict the lifetime of NBR and make full use of its performance upon understanding its aging behavior, as well as degradation mechanism. [13][14][15] Therefore, the thermal aging of NBR requires special attention.…”

Section: Introductionmentioning

confidence: 99%

Accelerated aging behavior and degradation mechanism of nitrile rubber in thermal air and hydraulic oil environments

Wang

2023

Polymer Engineering & Sci

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The aging behavior and degradation mechanism of nitrile rubber (NBR) under free and compression states were investigated in simulated air and hydraulic oil environments at various elevated temperatures. The variations in the crosslinking density, volatile components and the chemical structure of NBR during aging were studied using equilibrium swelling testing and dynamic mechanical analysis (DMA), pyrolysis-gas chromatography-mass spectrometry and attenuated total reflection-Fourier transform infrared spectroscopy. The migration of additives in different media and the crosslinking density of NBR aged in different conditions were compared. The tensile strength, DMA, and thermogravimetric analysis results were consistent with the changes in the crosslinking density of NBR and the migration of additives. Four effects of the simulated hydraulic system on the thermal aging of NBR were examined. Both the compression stress and the oil medium slowed the aging of NBR. The results can provide new insights into the use of NBR products in lubricating oil environments and NBR lifespan prediction in hydraulic working conditions.

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“…As a basic industry supporting global economic growth, power industry also ensures the orderly operation of national life. Safe, reliable, and economical power supply is the primary goal of the power industry; power transformer is the key power transmission and transformation equipment in the power system [1][2][3][4]. The healthy state of transformer equipment directly affects the safe and stable operation of power system; it will bring largescale power paralysis and huge economic losses once serious transformer fault occurs [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A review on a novel method for aging evaluation of transformer insulating paper based on methanol

Chen

Sun

Cheng

et al. 2023

IET Generation Trans & Dist

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The insulation paper is a crucial factor for evaluating the insulation status of transformers. The traditional evaluation methods for insulation paper are dissolved gas component content analysis (CO and CO 2 ) and furfural (2-FAL) content analysis in oil. The detection principle of the former leads to its low accuracy, while the field application effect of the latter is not ideal due to the easy oxidation of furfural and low content. Methanol, result of its good stability and high production compared with other marker products (CO, CO 2 , 2-FAL) has been investigated as a novel marker for aging evaluation of transformer insulating paper in recent years. The results of the investigation indicated that there is a good correlation between the content of methanol in oil and the degree of polymerization under laboratory conditions, which reflected the insulation aging state of the transformer insulating paper more accurately. This paper summarizes the current research status of methanol formation mechanism, detection methods and aging evaluation in insulating oil, and points out the key problems to be solved and development prospects, hoping to provide relevant reference for aging evaluation of oil immersed power transformer.

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Lifetime prediction of nitrile rubber under compression stress in transformer oil

Cited by 6 publications

References 18 publications

HNBR and NBR gasket rubbers for plate heat exchangers: Thermo‐oxidative aging and service lifetime prediction

HNBR and NBR gasket rubbers for plate heat exchangers: Thermo‐oxidative aging and service lifetime prediction

Accelerated aging behavior and degradation mechanism of nitrile rubber in thermal air and hydraulic oil environments

A review on a novel method for aging evaluation of transformer insulating paper based on methanol

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