Abstract
Adhesives, especially epoxies, are widely used as joints, repairs and corrosion protection in the petroleum onshore and offshore industry. Performance temperature is a key factor for such material. Mainly they are designed by the thermal properties but when they are in real service operation the behavior changes drastically. In this work, three different epoxy adhesives used in the offshore industry are characterized by DSC, DMA and TGA methods. The main objective is to verify if thermo mechanical tests on adhesives produces enough information to use in temperature service situation instead of test single lap joints (SLJ) at different temperatures. From the tests results it can be seen that adhesive SLJ should be tested in order to proper service design.
Highlights
Oil exploitation presents new challenges to offshore engineering and operating companies
The objective of this study is to characterize these epoxy adhesives by means of Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Thermogravimetric analysis (TGA), compare to the results obtained in single lap joints (SLJ) manufactured with the same adhesives [12] tested at different temperatures and verify if thermo mechanical tests on the adhesives produces enough information to use in temperature service situation
For the ARC 858 a large variability between the results of the analysis shows that the material, despite having a similar behavior of a polymer without filler, does not allow a design of SLJ using the glass transition temperature as a parameter for determination of the upper limit service temperature, because the SLJ presented much lower temperature resistance compared to the results of thermal analysis by DSC and DMA
Summary
Oil exploitation presents new challenges to offshore engineering and operating companies. Polymer adhesives industry is currently placing emphasis on protective coatings, structural applications and reparability as part of the incorporation of such material in oil production systems. Epoxy adhesives are the most used material for such applications. In terms of structural applications, epoxy resins are usually brittle and temperature sensitive. One of the most important parameter related to temperature is the one associated with the glass transition temperature (Tg) [5]. The basis of this transition is the onset of coordinated molecular motion in the polymer chain. The polymer becomes rubbery [6] and when Tg is exceeded, it can compromise significantly the mechanical properties of the material taking as the operational limit temperature. Tg is a valuable characterization parameter associated with a material and can provide very useful information regarding the endues performance of a product
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