Solvent-free epoxy heavy-duty anticorrosive coating for automatic spraying for online repairing of petroleum pipelines

Abstract

The invention relates to a solvent-free epoxy heavy-duty anticorrosive coating for automatic spraying for online repairing of petroleum pipelines, which consists of a first component coating containing a paint vehicle and a second component coating containing a curing agent, wherein the first component comprises the following materials in portion by weight: 30 to 60 portions of epoxy resin, 5 to 15 portions of glycidyl ether reactive diluent, 0.05 to 1 portion of silicone antifoaming agent, 20 to 35 portions of nano anticorrosive pigment, 7 to 25 portions of silicon dioxide mineral filler, and3 to 10 portions of pigment. The second component comprises the following materials in portion by weight: 15 to 35 portions of mannich base, 15 to 35 portions of cardanol curing agent, 3 to 10 portions of polyamide wax, and 30 to 55 portions of silicon dioxide mineral filler. The first component and the second component are dispersed evenly at a high speed and a low speed respectively, and then packaged after being filtered by an 80-mesh filter screen. The solvent-free epoxy heavy-duty anticorrosive coating can realize the automatic spraying for the online repairing, can be applied to the automatic spraying for corrosion protection of a newly-built pipework, and can also be applied to the corrosion protection of other steel structure and reinforced concrete works.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to an on-line oil pipeline repair automatic spraying solvent-free epoxy heavy duty for various pipelines, wharf bridge piles, offshore oil production and drilling platforms and other underwater steel or concrete projects. Anti-corrosion coating. Background technique [0002] Petroleum asphalt paint and epoxy coal tar pitch paint were widely used in early pipeline anticorrosion, but they were gradually eliminated due to solvents, environmental pollution, low construction efficiency, and high labor intensity. [0003] The solvent-free epoxy coal tar heavy-duty anti-corrosion coating developed by Xiamen Shuangrui Marine Coatings Co., Ltd. according to the anti-corrosion needs of the South-to-North Water Diversion Project has realized automatic spraying, and the thickness of a single coating can reach 1000μm without sagging. The performance of this product has reached the advan...

AI Technical Summary

Problems solved by technology

Usually, when the viscosity of solvent-free epoxy coating is about 3000cps at this temperature, the coating thickness can only be about 200 microns, and the coating thickness is required to reach 500-1000 microns at this temperature, and the viscosity is often 6000-10000cps, so Not applicable; Secondly, the surface temperature of the online oil pipeline is usually around 40°C. It is required that the sprayed coating should be surface-dried at this temperature for 30 minutes, hard-dried for 1 hour, and soil can be backfilled within 2 hours. Usually, solvent-free epoxy coatings are used at this temperature. Surface drying and hard drying time can not meet the requirements, and the application period of the coatings that can meet the requirements is too short, only 3 to 4 minutes, and even cause explosion, so it is not applicable

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