Preparation And Properties Of Anticorrosive And Thermal Insulation Composite Coatings For Petroleum Refining Pipelines Temperature Anticorrosive Coatings

Since entering the new era,the conflict between human production in various industries and energy shortage has been increasingly exacerbated,especially in the petroleum refining and chemical industry.At present,there are many problems with the anti-corrosion and thermal insulation measures of petrochemical pipelines,such as high temperature,corrosion and so on.Therefore,a complete set of anti-corrosion thermal insulation coating systems was designed to address such practical problems as the high temperature of petrochemical pipelines,the lengthy process to maintain high temperatures,and others like safety,corrosion under insulation and thermal insulation imperative.In this paper,an exploration is conducted from the following four perspectives:1.After the curing of selected epoxy resin,the thermogravimetric analysis?TGA?and differential scanning calorimeter?DSC?were conducted to test its high-temperature resistance.The epoxy resin material was coated on a Q235 steel plate and placed in a blast drying oven with the temperature set to 120°C for 42 days.There were no cracks or holes in the coating.Besides,no shedding,blistering or other failures were found.It was shown that the resin can work for a long time at 120?.2.A high-temperature resistant anticorrosive primer was prepared on the basis of high-temperature resistant epoxy resin.Besides,the adhesion,water resistance,acid resistance,alkali resistance and salt water-resistance of the primer were studied.According to the experimental results,the primer achieved a high adhesion strength?>5.1MPa?to the Q235 steel substrate.The coating was immersed in pure water for 42days,with the coating being intact.The coating was immersed in a 5w%NaOH solution for 7 days to demonstrate a good performance in alkali resistance.The immersion of the coating in 3.5w%pure water lasted 42 days,with the coating being intact,indicating that the coating could produce an excellent performance in the resistance to water,saltwater and alkali substance.3.In this paper,the high-temperature resistant epoxy resin,high reflectivity moisture flake aluminum powder,high emissivity SiC?200-300nm?,the hollow glass microbeads with extremely low resonance coefficient,and an appropriate amount of additives were applied to prepare infrared reflective coating and infrared emitting coating,respectively.Not only does metal aluminum powder shows a greater reflectivity of metal to infrared,it can also be directionally distributed in the coating to form a mirror surface during the drying and curing process of the coating film,thus further improving the infrared reflection efficiency of the coating and studying the detail of shear speed?600rpm?,the lateral-size of the aluminum powder?8?m?,and the filling amount?60%?,the coating has the best-infrared reflection performance.The transition between the molecular rotation level and the vibration level will lead to a broad infrared radiation band,which is because SiC is a kind of desirable bidirectional high emissivity material.The study has found out that the SiC filling amount?10%?,a variety of infrared radiation when the fillers work together?Al₂O₃,CoO,etc.?,the infrared radiation performance of the coating is optimal?0.94?.Glass microbeads have extremely thin outer walls with low resonance coefficients.The air that does not flow inside can also be regarded as a vacuum.Besides,during the curing process of the coating,air will exist between the hollow glass beads and the hollow glass beads.The resin could reduce the mutation coefficient of the coating significantly.In the study,it was found out that the best dispersion rate?200rpm?of the dispersed hollow glass microspheres and the overall capacity of the thermal barrier coating are satisfactory when the glass microspheres are filled?40%?.4.The synergy of self-made insulation coatings,infrared radiation coatings,infrared-reflective coatings,and thermal insulation coatings was adopted to coat the pipeline layer by layer.Moreover,the coating was tested for thermal insulation,thermal insulation,and energy-saving effects.Under the influence of the composite layer,the pipeline at 120°C can be effectively reduced to a surface temperature below 50°C and the total thickness is approximately 3-3.5mm.