Research and Application of Solvent-Free Internal Drag Reducing Epoxy Coating for Non-Corrosive Gas Transmission Service

Abstract

The developed coating performance meets the corresponding technical specification by using modified epoxy resin and E51 epoxy resin as resin system to optimize the system viscosity and flexibility, adding reactive diluents owning good flexibility, using modified alicyclic amine curing agent with good flexible performance and corrosion resistance, optimizing assistant system concluding defoaming agent, levelling agents and so on. Application adaptability, concluding viscosity, thixotropy, sag resistance and pot life, were also studied under different temperatures, considering that these parameter are important to spraying process. The dry film thickness can be adjusted between 60-150 μ m by modulating spraying application parameters, meanwhile, the flat smooth film meets internal drag reducing coating technical parameters requests. The product were successfully applied in China key projects. According to field pilot test, application attention items were also discussed.