Rheokinetic modeling of fusion bonded epoxy powder coatings at standard and low application temperature (English)

International Conference on Pipeline Protection, 18
BHR Group , Cranfield; 2009

During the application of FBE (Fusion Bonded Epoxy) coatings, the powder must melt, flow and cure completely before quenching. The minimum melt viscosity that the material achieves during application is important in determining the ability of the material to form a contiguous layer and to form adhesive bonds with the substrate. If the minimum melt viscosity is too high, the coating material will not form a contiguous layer. On the other hand, if it is too low, the coating layer may not be uniform. One way to determine the required minimum melt viscosity is to mathematically model a well characterized high performance FBE formulation made with an epoxy resin having a similar backbone structure and functional groups as that used in the formulation(s) under evaluation. Using rheology and kinetic models, the rate of reaction and flow behavior of four different FBE formulations, specifically designed for an application temperature of 180 deg C, have been evaluated. The predicted performance of these formulations was compared against the predicted performance of a standard FBE formulation, which is known to produce a good coating at an application temperature of 240 deg C. The LAT-3 formulation had a predicted minimum melt viscosity close to the control formulation. The LAT-3 formulation also had the best flexibility, as predicted, of all the LAT formulations evaluated. A temperature sensitivity study was conducted, using the bar bending test, to determine the application temperature range. The analysis showed that the LAT-3 formulation would provide a high performance FBE coating within the application temperature range of 163-204 deg C. The temperature sensitivity study also showed that the flexibility of the coatings decreased slightly as the minimum melt viscosity increased. This increase in minimum melt viscosity is due to the decrease in the application temperature. Reducing the application temperature below 163 deg C resulted in incomplete cure which was detrimental to the flexibility of the coating. In conclusion, this study demonstrates that rheology and kinetic modeling can be used to evaluate the ability of FBE to form a uniform film that cures within the processing time commonly used in the pipe coating industry. Furthermore, the minimum melt viscosity is an important parameter in determining the ability of FBE to form a contiguous and high performance coating

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The table of contents of the conference proceedings is generated automatically, so it can be incomplete, although all articles are available in the TIB.

5
Residual stresses in 3LPO external pipeline coatings - disbondment and cracking
Chang, B.T.A. / Wong, D. / Kehr, A. / Aguirre, F. / Pham, H. / Snider, W. | 2009
25
A new application process that assures good adhesion of fusion bonded epoxy coating exposed to very severe conditions
Gaillard, G. / Bouliez, J.L. / BHR Group Limited | 2009
43
Adhesion failure of external 3 layer extruded polyethylene (3 LPE) based coatings for gas/oil transmission pipelines buried under soil
Hussain, A. / Pflugbeil, C. | 2009
57
Development and performance of a low application temperature FBE coating
Pratt, J.K. / Mallozzi, M.L. | 2009
67
Design of Mid.Tg FBE powder coatings to meet the requirements of pipe coaters and pipeline owners
Patterson, M. / Drew, S. / Boerschel, V. | 2009
81
Rheokinetic modeling of fusion bonded epoxy powder coatings at standard and low application temperature
Shafi, M.A. / Aguirre, F. / Trottier, E. / Falcone-Potts, S. | 2009
95
PNC: A new solution for offshore field joint coatings
Mallozzi, M. / Perez, M. / BHR Group Limited | 2009
103
Novel field joint coating solutions for the construction of subsea pipelines
Tailor, D. / Tacoma, E. / BHR Group Limited | 2009
117
Pipeline rehabilitation for the 21st century
Bond, T.J.M. / Miles, D.J. / Burke, R.N. / Venero, N.J. / BHR Group Limited | 2009
137
The impact of logistic operations on coatings in the supply chain of pipelines
van Assema, I.M. / BHR Group Limited | 2009
151
Rapid hardening concrete cloth for oil, gas and water pipeline protection applications
Orr- Adams, F.A. / Brewin, P. / Hiam, E. | 2009
161
Dow products for 3LPE steel pipe coating - AMPLIFY™ GR 320 and HDPE 12110G
Henschke, O. / BHR Group Limited | 2009
169
Rehabilitation of corrosion protective coatings on buried steel pipelines
Schad, M. / Ströter, C. / Rehberg, T. | 2009
185
The challenge - renovation project in new dimensions: the renewal of the anti-corrosion protection of the hydropower station at Wehr, Germany
Zwanzinger, A. / Rainer, E. / Huber, T. / BHR Group Limited | 2009
201
Foamed cement mortar to protect coated steel pipelines from external acid attack
Trebicki, D.D.P. / BHR Group Limited | 2009

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