Novel Polyurethane Coatings Obtained with Polycarbonate Diol

Introduction

Several substrates are severely exposed to aggressive outdoor environments (abrasion, corrosion, resistance to chemical or solvents, degradation by moisture or water), and to prevent the reduction of their properties due to degradation several coatings of different nature are commonly used. In the particular case of piping for the oil and mining industry, degradation is a key concern as inside the pipeline corrosive fluids containing solid particles are circulating. For increasing the durability of the pipelines they are internally coated to increase their lifetime and increase the time for maintenance [1]. These coatings are commonly based on polymeric materials, more specifically semi-rigid polyurethanes [2]. Polyether diol-based polyurethane coatings are currently used for pipelines due to their relatively good water resistance but their wear resistance and stability against oils and solvents, as well as thermal stability are not fully satisfactory [3]. Typically, the drawbacks of these polyurethane coatings have been solved by incorporating additives particularly fillers of different nature and size (nano-silica, zinc oxide, alumina particles [4-6]