Development Of Nano-function Anti-corrosion Coatings Used In The Tank Bottom

With the increase of crude oil processing capacity year by year, an increasing load of oiltanks, which perforation caused by increasingly frequent oil spills due to corrosion, accordingto the survey data analysis, corrosion in the oil tank, bottom plate corrosion account for80%;corrosion at bottom edge of the board account for60%among the bottom plate corrosion;therefore corrosion at the bottom edge of plate is a major cause of the tank failure.Titanium is a very strong corrosion resistance of metals, titanium used in thepreparation of nano-modified polymers can further improve the anti-corrosion coatingcorrosion resistance of the coating, the nano-particles not only can be filled with "structuralholes" which conventional coating can’t be inevitable, but also greatly increase the dense ofthe film; improve the adhesion strength of binding coating and the base metal, so that there isno development space for electrochemical corrosion; reduce the UV degradation offilm-forming agent, delay the ageing of the coating, so prong the service life of coating.Epoxy resin is the most widely used in heavy-duty coatings as a main film-forming resin butit has such faults as brittle, easy aging, often difficult to meet the requirements of practicalapplication and so on, therefore its applications has some limitations. So the modification isthe foundation of development in high performance resin based coatings.Solvent-free anticorrosive coatings is an important direction of anticorrosive paintdevelop to environment-friendly and energy saving. However, solvent-free coating has a greatviscosity, and difficult to flow and finishing, meanwhile wet coating is not easy to flow so tocause marks, wrinkles and other defects. Nano-particles modified by organic modifier in theform of dispersion added to preparation of coating process, which not only can performancethe unique characteristic of nano-particles, develop special coatings, which can also play therole as similar to organic solvents to adjust the viscosity of coating, and make the finishingoperations easy to carry out.This research chooses low molecular epoxy resin as the main film-forming substances,cashew nut shell oil modified phenolic aldehyde amine as a curing agent, supplemented byappropriate reactive diluent, nano-TiO₂dispersion, additives, a variety of antirust pigments and fillers which overcome the shortcomings of using a single antirust paint, preparation anew kind of solvent-free nano-anticorrosive coatings.Using orthogonal test method to optimize the formulations of coating and discuss theeffect of different components on properties of anti-corrosion coatings, and make a test ofits solid content, adhesion, toughness and other basic physical tests, besides testing thepenetration resistance, the durability in acid and alkali salt solution immersion, resistant tochemical corrosion etc. The results show that the optimization of nano-corrosion coatingformula is: carboxyl-terminated butadiene rubber modified epoxy resin45%（masspercentage）, reactive diluents2%,12%of dispersion of TiO₂,1%of additives, pigments16%filler24%; the preparation of solvent-free nano-corrosion coating can be fast curing at roomtemperature, with high adhesion, flexibility, good resistance to penetration, and anticorrosionperformance is superior.