Corrosion-resistant phenolic epoxy coating under insulation

Abstract

The invention discloses a phenolic aldehyde epoxy coating with CUI (corrosion under insulation) resistance. The phenolic aldehyde epoxy coating comprises a component A and a component B, wherein the component A comprises raw materials in percentage by weight as follows: 20%-30% of phenolic aldehyde epoxy resin, 16%-19% of a solvent, 0.5%-0.6% of a thixotropic agent, 0.4%-0.6% of a defoaming agent, 15%-22% of flaky iron oxide red, 5%-8% of hollow glass microspheres, 27%-34% of barite and 0.5%-1% of a silane coupling agent; the component B is 100% modified polyamide resin; before coating, the component A and the component B are mixed in a weight ratio of A to B being (88-92): (8-12) for use. According to the phenolic aldehyde epoxy coating with CUI resistance, a high-temperature-resistant film can be combined with flaky iron oxide red and the hollow glass microspheres, and an acquired coating layer has good high-temperature resistance, high-temperature cracking resistance and good long-term corrosion resistance, and can effectively resist metal surface corrosion caused by rainwater, mist and electrolyte ion infiltration under insulation; the phenolic aldehyde epoxy coating is easy to prepare and simple, facilitates construction and can be widely applied to the fields of petrochemical industry and thermal pipeline application.

Description

technical field [0001] The invention relates to the technical field of paint research and preparation, and relates to the petrochemical industry and a protective paint for steel structures that has an anti-corrosion effect under the condition of heat preservation, specifically, a corrosion-resistant phenolic epoxy paint under the heat preservation layer. Background technique [0002] The worldwide energy crisis has promoted the research and development of energy-saving technology, and the energy-saving technology has promoted the general application of thermal insulation technology in the petrochemical industry and thermal pipelines. The function of the thermal pipeline insulation layer is to block the loss of heat flow, and most of the insulation materials used are processed by mineral calcination and then bonded. Because minerals contain a large amount of inorganic salts, thermal insulation materials made of minerals still contain a large amount of corrosive substances suc...

AI Technical Summary

Problems solved by technology

Due to the relatively high working temperature of thermal pipelines, the effect of ordinary coatings under the insulation layer is limited. This is due to: (1) ordinary coatings are not resistant to high temperatures, and they are prone to blistering and carbonization on the coating surface at high temperatures, resulting in excessive coatings. Early failure; (2) Some high-temperature-resistant coatings are relatively thin due to the construction coating, although they can withstand high temperatures, but the anti-corrosion effect is not ideal, and they are prone to corrosion after short-term use