Thermooxidative Behavior of Some Paint Materials in Natural Ester Based Electro-insulating Fluid

Abstract

ATR / FTIR and DSC techniques have been used to evaluate the thermal stability of some ageing paint materials by heat treatment while immersion in natural ester-based electro-insulating oil. Experimental determinations have highlighted the fact that the investigated paint materials (epoxy resins) have a high oxygen affinity and thus, in closed systems (such as power transformers), they oxidize before coming into contact with the transformer oil. This behavior indicates that the paint layer (suitably chosen) applied on the inside of the transformer vat functions as an antioxidant and results in increasing the thermal stability of the oil.

The Hydrophily of Some Lacquers for Electrical Use

“…A particular case is represented by the situations in which the lacquer \ the polymer for electrical use, specific to the application is in contact with electoinsulating fluids (such as oil of transformer) with a given humidity content [30][31][32][33][34][35][36][37]. At the same time, the water absorption of polymers can be determined by modifying the dielectric characteristics of composite materials based on polymers with various fillers [38][39][40][41][42][43][44][45].…”

Mechanical and Morphostructural Characteristics of Composite Materials Performed by Recycling Mixed Waste of Plastic and Paper

“…In this context, the recovery and reuse of waste materials is of particular importance, thus contributing to the reduction of environmental footprint, both by preventing environmental pollution (including persistent pollutants [1,5]) and preserving non-renewable natural resources (metals, hydrocarbons etc.). Polymeric materials during operation, under the action of stress factors specific to the operating environment, suffer a series of ageing processes by which functional characteristics degrade significantly [6][7][8][9][10][11][12][13]. In practice, waste containing polymeric material shows a great diversity (inseparable mixtures obtained from various polymers with or without metals, paper, wood, etc.…”

Assessment of Paint Layers Quality 3. Analysis by SEM-EDAX and XRF techniques of the paint layers applied on a railway bridge

“…They degrade relatively fast both by top coat degradation and by intense increases of biofouling.The metal structures durability and safety in exploitation are complex issues from theoretical point of view, but also with material, social and, ecological significant implications.The theoretical complexity of the issues arises from the special diversity of the stress factors acting synergistically on the metal structures and the protection systems provided.Depending on the operating environment during exploitation, the metal structures and the anti-corrosion protection systems with which they are provided are exposed to a number of stress factors such as: mechanical (vibration, trepidation, etc. ), thermal [1, 2] climatic [3-6], non-ionizing radiation in IR and / or UV spectrum [2,4,6,7], chemical [8][9][10][11][12], microbiological [14-25] etc.Under concerted / simultaneous and synergistic action of stress factors, corrosion protection films (usually polymeric) are ageing and lose their anti-corrosion protection capability [15].After the first corrosion germs appear under the paint layer the process is substantially accelerated -firstly in the joining zones (screws, welds, etc., fig. 1 and fig.…”

“…Depending on the operating environment during exploitation, the metal structures and the anti-corrosion protection systems with which they are provided are exposed to a number of stress factors such as: mechanical (vibration, trepidation, etc. ), thermal [1,2] climatic [3][4][5][6], non-ionizing radiation in IR and / or UV spectrum [2,4,6,7], chemical [8][9][10][11][12], microbiological [14][15][16][17][18][19][20][21][22][23][24][25] etc.…”