摘要
为了改善油气田用大口径RTP管的柔韧性,避免在盘卷包装过程中发生弯折,产生废品,本文采用聚烯烃弹性体POE为改性剂,与RTP管的内衬层专用料HDPE共混改性,研究不同百分含量POE对RTP管内衬层力学性能的影响,同时对改性后维卡软化温度、熔体流动速率、纵向回缩率进行研究分析,从而确定最佳的改性配比参数。实验结果表明:随着POE含量的增加,内衬层的弹性模量呈现规律性变化,当POE质量分数为15%时,内衬层的弹性模量相对未改性前降低了30.7%;随POE含量增加内衬层的耐热性呈下降趋势;纵向回缩率小于3%,受热后轴向尺寸稳定;氧化诱导时间均在50 min以上,热稳定性未减弱。综上,POE质量分数为15%时,内衬层刚度最低,力学性能、热稳定性、热收缩等满足大口径RTP管的使用要求。
In order to improve the flexibility of large-diameter RTP pipes used in oil and gas fields and avoid bending and waste during the coil packaging process,polyolefin elastomer POE was used as a modifier to blend with the special material HDPE for the inner lining of RTP pipes.The effect of different percentage POE content on the mechanical properties of the inner lining of RTP pipes was studied.At the same time,research and analysis were conducted on the modified Vicat softening temperature,melt flow rate,and longitudinal shrinkage rate to determine the optimal modification ratio parameters.The experimental results showed that as the POE content increased,the elastic modulus of the inner lining layer showed a regular change.When the POE mass fraction was 15%,the elastic modulus of the inner lining layer decreased by 30.7%compared to before modification;The heat resistance of the inner liner decreased with the increase of POE content;The longitudinal shrinkage rate was less than 3%,and the axial size was stable after heating;The oxidation induction time was above 50 minutes,and the thermal stability was not weakened.In summary,when the POE mass fraction was 15%,the inner liner stiffness was the lowest,and the mechanical properties,thermal stability,and thermal shrinkage met the requirements for the use of large-diameter RTP pipes.
作者
谢航超
赵坤
刘海璋
XIE Hangchao;ZHAO Kun;LIU Haizhang
出处
《化工装备技术》
CAS
2023年第5期22-26,共5页
Chemical Equipment Technology
关键词
柔性复合高压输送管
聚烯烃弹性体
高密度聚乙烯
POE
HDPE
Flexible composite high-pressure conveying pipe
Polyolefin elastomers
High density polyethylene
POE
HDPE
