首页|HTPO内穿插管输油工况下的性能退化规律

HTPO内穿插管输油工况下的性能退化规律

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为了研究耐高温聚烯烃(HTPO)内穿插管在输油工况下的性能退化规律,采用煤油介质模拟输油工况,比较管材在不同温度(20~80℃)和浸泡时间(0~7周)下的质量、密度、结构成分、微观形貌、热稳定性、力学性能的变化规律,研究发现,HTPO管材仅在空气中加热时,主要发生热氧化,随着温度升高,质量和密度无明显变化,热稳定性略有下降,碳氧基团吸收峰增强,材料表面出现细小裂纹,屈服强度和弹性模量分别降低了8.15%和13.12%.当管材在20℃浸泡1周时,由于煤油介质的溶胀作用,出现了C=C溶胀吸收峰和C=O伸缩振动峰,材料表面呈沟壑状,屈服强度和弹性模量分别降低3.11%和7.93%.随着温度升高和浸泡时间延长,管材氧化降解程度增大,煤油溶胀作用加剧,80℃浸泡7周时,试样质量增加10.4%,C=C峰和C=O峰的强度增强,材料表面出现蚀刻现象,屈服强度和弹性模量降低38.75%和75.51%,热稳定性显著下降.
Performance degradation of HTPO internal penetration pipe under oil transportation conditions
In order to investigate the performance degradation of high temperature resistant polyolefin(HTPO)internal penetration pipe under the oil transmission conditions,kerosene medium was used to replicate the operational conditions of oil transmission.Through an examination of the fluctuations in mass,density,structural composition,micro-morphology,thermal stability and mechanical properties of the pipelines under varying temperatures(20~80℃)and immersion durations(0~7 weeks),it is found that:When subjecting HTPO pipes to heating in the air environment,predominant thermal oxidation takes place.With the increase of temperature,there are no obvious changes in the mass and density,the thermal stability slightly decreases,the absorption peaks of carbon-oxygen groups are enhanced,the minor surface cracks appear on material surface,and yield strength and modulus of elasticity decrease by 8.15%and 13.12%,respectively.When the pipes are immersed at 20℃ for one week,due to the swelling effect of the kerosene medium,C=C swelling absorption peak and C=O expansion vibration peak appear,the surface of HTPO exhibits grooves,and its yield strength and modulus of elasticity experience reductions of 3.11%and 7.93%,respectively.With the increase of temperature and immersion time,the extent of oxidative degradation of the pipe rises,and kerosene swelling intensifies.After subjecting the sample to 80℃ for seven weeks,a notable 10.4%increase in sample mass is observed.Additionally,the intensity of the C=C peak and C=O peak is enhanced,along with the appearance of an"etching"phenomenon on the material surface.The yield strength and elastic modulus decrease by 38.75%and 75.51%,respectively,and the thermal stability significantly declines.

high-temperature resistant polyolefin tubeimmersion testperformance degradation

张学敏、张洁、李厚补、齐国权、杜嘉龙

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长安大学 材料科学与工程学院,西安 710064

中国石油集团工程材料研究院有限公司 油气钻采输送装备全国重点实验室,西安 710077

耐高温聚烯烃管 浸泡试验 性能退化

国家自然科学基金面上项目陕西省重点研发计划项目

522740692023-YBGY-177

2024

压力容器
中国机械工程学会压力容器分会

压力容器

CSTPCD北大核心
影响因子:1.384
ISSN:1001-4837
年,卷(期):2024.41(8)