Lifetime Prediction and Aging Behaviors of Nitrile Rubber Under Operating Environment of Transformer

다국어 초록 (Multilingual Abstract)

Based on the actual operating environment of transformer, the aging tests of nitrile butadiene rubber (NBR) were conducted systematically under four conditions: in air, in transform oil, under compression in air and under compression in transform oil to studythe effect of high temperature, transform oil and compression stress simultaneously on the thermal aging behaviors of nitrile butadiene rubber and predict the lifetime. The effects of liquid media and compression stress simultaneously on the thermal aging behaviors of nitrile butadiene rubber were studied by using characterization methods such as IR spectrosc-opy, thermogravimetric measurements, Differential Scanning Calorimetry (DSC) measurements and mechanical property measurements. The changes in physical properties during the aging process were analyzed and compared. Different aging conditions yielded materials with different properties. Aging at 70°C under compression stress in oil, the change in elongation at break was lower than that aging in oil, but larger than that aging under compression in air. The compression set or elongation at break as evaluation indexes, 50% as critical value, the lifetime of NBR at 25°C was predicted and compared. When aging under compression in oil, the prediction lifetime was lower than in air and under compression in air, and in oil. It was clear that when predicting the service lifetime of NBR in oil sealing application, compression and media liquid should be involved simultaneously. Under compression in oil, compression set as the evaluation index, the prediction lifetime of NBR was shorter than that of elongation at break as the evaluation index. For the life prediction of NBR, we should take into account of the performance trends of NBR under actual operating conditions to select the appropriate evaluation index.

참고문헌 (Reference)

1 Woo CS, "Useful lifetime prediction of rubber components using accelerated testing" 59 : 11-17, 2010

2 Grassie N, "Thermal degradation of copolymers of butadiene and acrylonitrile" 48 : 678-691, 1974

3 Alcock B, "The mechanical properties of a model hydrogenated nitrile butadiene rubber (HNBR) following simulated sweet oil exposure at elevated temperature and pressure" 46 : 50-58, 2015

4 Bystritskaya EV, "TGA application for optimising the accelerated aging conditions and predictions of thermal aging of rubber" 32 : 197-201, 2012

5 Xiong Y, "Study of stress accelerated aging behavior of sulfured nitrilebutadiene rubber" 9 (9): 52-55, 2012

6 Zhang H, "Study of UV irradiation on behavior of NBR rubber from oil seal,"" 1082 : 42-45, 2015

7 Kuczkowski JA, "Stabilization of raw dienic synthetic rubber polymers" 84 : 273-295, 2001

8 Zhu ZM, "Scratch behavior of the aged hydrogenated nitrile butadiene rubber" 352-353 : 155-159, 2016

9 Datta RN, "Rubber vulcanizates degradation and stabilization" 80 : 436-480, 2017

10 Kawashima T, "Prediction of the lifetime of nitrile-butadiene rubber by FT-IR" 21 : 1475-1478, 2005

11 Trakarnpruk W, "Palm oil biodiesel synthesized with potassium loaded calcined hydrotalcite and effect of biodiesel blend on elastomer properties" 33 : 1558-1563, 2008

12 Hara T, "Ozone deterioration of nitrile butadiene rubber surface" 10 : 93-, 1998

13 Hakkarainen M, "Migration and emission of plasticizer and its degradation products during thermal aging of nitrile butadiene rubber" 8 : 279-293, 2010

14 최성신, "Lifetime prediction and thermal aging behaviors of SBR and NBR composites using crosslink density changes" 한국공업화학회 18 (18): 1166-1170, 2012

15 Zhao JH, "Investigation of crosslinking in the thermooxidative aging of nitrilebutadiene rubber" 132 : 41319-41323, 2015

16 Buckley GS, "Influence of liquid media on lifetime predictions of nitrile Rubber" 131 : 40296-40301, 2014

17 Lv XR, "Effect of swelling nitrile butadiene rubber in cyclohexane on its aging, friction and wear characteristics" 328-329 : 414-421, 2015

18 Morrell PR, "Accelerated thermal aging studies on nitrile butadiene rubber Orings" 22 : 651-656, 2003

19 Budrugeac P, "Accelerated thermal aging of nitrilebutadiene rubber under air pressure" 47 : 129-132, 1995

20 Zhu ZM, "Accelerated aging test of hydrogenated nitrile butadiene rubber using the time-temperature-strain superposition principle" 5 : 90178-90183, 2015

21 Liu X, "A novel in-situ aging evaluation method by FTIR and the application to thermal oxidized nitrile butadiene rubber" 128 : 99-106, 2016