The quality of modes of 3PE heat shrinkable sleeve is determined by tackiness of hot melt adhesive rather than aging,according to TGA and aging tests.The tackiness of hot melt adhesive influences on pipeline remaining life and the transmission safety of oil or gas.This paper mainly discussed how the tackiness is determined by hot melt adhesive moisture performance which depends on melt rheology and polymer polarity and offer basic information to further modification. Finally,this paper offers a choice data after such follow experiment.About rheology,apparent viscosity was tested by capillary rheometer and tackiness strength was measured by universal material testing machine.Those tests show that Et(Fe/Fe)raises and Ep(Fe/PE)increases at first then decreases with apparent viscosity increasing.About polarity,the polarity was tested by dynamic contact angle locator. This measurement indicates that the moisture improves with polarity increasing and tackiness increases at same time.Generally,the hot-melt adhesive apparent viscosity and polarity extend,consider to pipeline materials properties and oil or gas transmission condition,should hold at 450 Pa·s<ηa(100°C ,20kg)<520 Pa·s and 82.0°<γ<90.6°.
展开▼
