IMPROVEMENT OF OPERATIONAL AND REPAIR CHARACTERISTICS OF CARGO TANK SURFACES OF BULK TANKER-CHEMICAL CARGO VEHICLES BY IMPLEMENTING HYBRID EPOXY-POLYURETHANE COATINGS
Abstract
Introduction. The tanker fleet plays a key role in the resource supply of the world’s leading countries. At the same time, a significant part of the tanker surfaces is in contact with an aggressive environment, which leads to the course of corrosion processes and, as a result, a decrease in the strength of metal structures. This, in turn, can lead to tanker accidents and the risk of environmental pollution. Therefore, new hybrid paint coatings are needed for the reliable operation of the surfaces of ship cargo tanks. Purpose. Thus, the work aims to analyze the structure of polymer materials to create polymer coatings with optimal composition intended for protecting the surfaces of cargo tanks of bulk chemical tankers. Results. To create polymer coatings designed for the protection of ship cargo tanks, the ED-20 epoxy oligomer was selected as a binder, which was cured with hardeners based on aliphatic amines, in particular: polyethylene polyamine (PEPA), triethylenetetramine (TETA), canine 2609. The optimal content of ingredients for creating a hybrid epoxy coating was determined based on comprehensive studies of the structure and properties. To create a hybrid coating with optimal functional properties, it is advisable to use as a binder – epoxy oligomer ED-20 (100 pts.wt.), hardener polyethylene polyamine (10 pts.wt.), polyurethane varnish UR 294 (5-10 pts. wt.). Conclusions. Studying the structure and properties of the created materials made it possible to rationally combine the ingredients to obtain a hybrid coating with optimal properties. Based on the analysis of the obtained X-ray diffraction patterns of the studied samples, it was found that when polyurethane varnish UR 294 is introduced in an amount of (5-10 pts.wt.) into the composition of the epoxy polymer, the average Bragg distance between the layers of molecular links of the epoxy polymer and PEPA increases. At the same time, the impact strength increases from 7.0 kJ/m2 (epoxy matrix) to 11.1-12.0 kJ/m2 (hybrid epoxy-polyurethane matrix). The developed hybrid polymer coatings can be used to improve the operational characteristics of cargo tanks of bulk chemical tankers.
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References
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