BIOCOATING ON OIL AND GAS PLATFORMS - PERIPHYTON AND THE SOOLIGOMER – BASED COMPOSITE USED AGAINST CORROSION

Abstract

Periphyton, which forms a biological cover by accumulating a large number of organisms, develops in large quantities in the underwater parts of ships and hydraulic structures, causing serious damage to facilities, especially maritime. Thus, periphyton organisms, which choose the submarine part of the ship as a substrate, cause the surface of the ship to be eroded and the speed of the ship to decrease by up to 50%. Therefore, the article investigates the use of varnish-based coatings based on urea-modified resorcinol formaldehyde soligomers to protect marine equipment and facilities from corrosion. For comparison, parallel studies were performed for both modified and unmodified resorcinol-formaldehyde oligomers. One of the main reasons for using the modified resorcinol-formaldehyde oligomer as a mask is the increased resistance to oil and gasoline at high temperatures. The optimum temperature for the synthesis of urea-resorcinol-formaldehyde soligomer was determined as 70ºC. Below this temperature, the amount of target product decreases, and at higher temperatures, the amount of soluble fraction decreases as the production process progresses. Changing the amount of modifier affects the speed and output of the process. When the amount of final product at 70°C ranges from 0.01 to 0.05 moles of urea, the yield ranges from 65,18 to 80,27%. In this case, the productivity of the soluble fraction decreases, the amount of the insoluble fraction increases. A comparative analysis of the main parameters of the urea-resorcinol-formaldehyde soligomer with that of the resorcinol-formaldehyde oligomer shows that the molecular weight, hardness, viscosity, density and softening temperature of the soligomer increase when the optimal amount of urea is 0.03 mol. Keywords: periphyton, biological coating, modification, synthesis, oligomers, resorcinolformaldehyde oligomer, urea, sooligomers.