A high temperature and high pressure resistant solvent-free heavy-duty anti-corrosion coating and its preparation method

Abstract

A high-temperature and high-pressure-resistant solvent-free heavy-duty anti-corrosion coating composition, including material A and material B, material A is obtained from a system comprising the following components: 40-60 parts of novolac epoxy resin, 5-10 parts of bisphenol F resin, and the reaction Type toughening agent 5-10 parts, reactive diluent 5-10 parts, thixotropic agent 1-3 parts, heat-resistant pigment 5-10 parts, additives 1-2 parts, filler 5-10 parts; material B is 20 ‑30 parts of curing agent, which is a mixture of modified fatty amine and modified phenalkamine. The high-temperature and high-pressure-resistant solvent-free heavy-duty anti-corrosion coating in the present invention is a solvent-free system, and the coating is environmentally friendly and green, and can be normally applied at 0-40°C, cured at room temperature, and does not need heating. After the coating is fully cured, it can achieve long-term anti-corrosion function under high-pressure, high-temperature, heavy-corrosion working conditions such as water-mixed pipelines and high-pressure gas-collecting pipelines, improve the use efficiency of pipelines, and improve the safety of transportation.

Description

technical field [0001] The invention relates to the technical field of epoxy coatings, in particular to a solvent-free heavy-duty anti-corrosion coating resistant to high temperature and high pressure. Background technique [0002] Due to the utilization of geothermal water resources, geothermal water is mixed with produced oil in the oil field, and then transported for a long distance through buried pipelines, which are called water-mixed pipelines. This approach can effectively save resources and improve oil transportation efficiency. However, the temperature of the water-mixed pipeline is very high due to the geothermal water. The general design temperature is 135°C, which is often accompanied by a high delivery pressure. With the increase of the service life, the corrosion phenomenon of the pipeline is intensified, the inner wall of the pipeline is unevenly thinned, the pressure bearing capacity is reduced, and local perforation and rupture cause leakage accidents. [...

AI Technical Summary

Problems solved by technology

However, the temperature of the water-mixed pipeline is very high due to the geothermal water. The general design temperature is 135°C, which is often accompanied by a high delivery pressure. With the increase of the service life, the corrosion phenomenon of the pipeline is intensified, the inner wall of the pipeline is unevenly thinned, the pressure bearing capacity is reduced, and local perforation and rupture cause leakage accidents.

[0003] Traditional high-temperature and high-pressure heavy-duty anti-corrosion coatings currently only have solvent systems, which are accompanied by solvent volatilization during the construction of long-distance buried pipelines. However, due to the air tightness in the pipeline, the solvent volatilization speed is slow and incomplete, which prolongs the commissioning of the pipeline. Period, and at the same time greatly reduce the original performance of the coating, can not achieve long-term anti-corrosion effect

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