采用原位固化法对病害管道进行修复,在实际施工过程中软管基材的浸渍性能、内外层的尺寸以及操作流程是否规范,都会对软管最终的固化效果产生影响。本文针对原位固化法修复病害管道过程中遇到的软管基材树脂浸渍、软管幅宽设计、固化管...采用原位固化法对病害管道进行修复,在实际施工过程中软管基材的浸渍性能、内外层的尺寸以及操作流程是否规范,都会对软管最终的固化效果产生影响。本文针对原位固化法修复病害管道过程中遇到的软管基材树脂浸渍、软管幅宽设计、固化管渗漏问题进行研究。所用基材无纺布规格为800g/m^2,防渗层为TPU 膜,厚度为0.4mm,实验结果表明:无纺布的孔隙率为84%,在真空度为60kPa、70kPa 和80kPa 时,软管浸渍率分别为0.436×10^-7m^2/m^2,0.257×10^-7m^2/m^2,0.474×10^-7m^2/m^2;经多次优化设计和实验,针对DN400 软管,其内、外层幅宽分别为:116 cm 和112 cm 时,软管固化后无褶皱形成;添加Al(OH)3 有助于提高固化管的初始结构力学性能。展开更多
Polyimide matrix composites interpenetrated with foamed copper were prepared via pressure impregnation and vacuum immersion to focus on their thermostability, mechanical and tribological behaviors as sliding electrica...Polyimide matrix composites interpenetrated with foamed copper were prepared via pressure impregnation and vacuum immersion to focus on their thermostability, mechanical and tribological behaviors as sliding electrical contact materials. The results show that the interpenetrating phase composites（IPC） are very heat-resistant and exhibit higher hardness as well as bending strength, when compared with homologous polyimide matrix composites without foamed copper. Sliding electrical contact property of the materials is also remarkably improved, from the point of contact voltage drops. Moreover, it is believed that fatigue wear is the main mechanism involved, along with slight abrasive wear and oxidation wear. The better abrasive resistance of the IPC under different testing conditions was detected, which was mainly attributed to the successful hybrid of foamed copper and polyimide.展开更多
文摘采用原位固化法对病害管道进行修复,在实际施工过程中软管基材的浸渍性能、内外层的尺寸以及操作流程是否规范,都会对软管最终的固化效果产生影响。本文针对原位固化法修复病害管道过程中遇到的软管基材树脂浸渍、软管幅宽设计、固化管渗漏问题进行研究。所用基材无纺布规格为800g/m^2,防渗层为TPU 膜,厚度为0.4mm,实验结果表明:无纺布的孔隙率为84%,在真空度为60kPa、70kPa 和80kPa 时,软管浸渍率分别为0.436×10^-7m^2/m^2,0.257×10^-7m^2/m^2,0.474×10^-7m^2/m^2;经多次优化设计和实验,针对DN400 软管,其内、外层幅宽分别为:116 cm 和112 cm 时,软管固化后无褶皱形成;添加Al(OH)3 有助于提高固化管的初始结构力学性能。
文摘Polyimide matrix composites interpenetrated with foamed copper were prepared via pressure impregnation and vacuum immersion to focus on their thermostability, mechanical and tribological behaviors as sliding electrical contact materials. The results show that the interpenetrating phase composites（IPC） are very heat-resistant and exhibit higher hardness as well as bending strength, when compared with homologous polyimide matrix composites without foamed copper. Sliding electrical contact property of the materials is also remarkably improved, from the point of contact voltage drops. Moreover, it is believed that fatigue wear is the main mechanism involved, along with slight abrasive wear and oxidation wear. The better abrasive resistance of the IPC under different testing conditions was detected, which was mainly attributed to the successful hybrid of foamed copper and polyimide.
