Self-repairing high-durability anticorrosive composite coating and preparation method thereof

Abstract

The invention relates to a self-repairing high-durability anticorrosion composite coating, which sequentially comprises a nano modified epoxy zinc-rich primer layer, an elastic self-repairing epoxy micaceous iron oxide intermediate layer and an aliphatic polyurethane topcoat layer from bottom to top, wherein the primer layer is prepared from solid epoxy resin, modified liquid epoxy resin, zinc powder, nano metal oxide, solvent, dispersant, defoaming agent, anti-settling agent, epoxy curing agent and diluent A; The intermediate paint layer is prepared from solid epoxy resin, toughened epoxy resin, mica iron oxide, self-repairing microcapsules, solvents, dispersants, defoamers, anti-settling agents, modified polyamine curing agents and diluent A; The topcoat layer is prepared from modified hydroxyl acrylic resin, heat reflection pigment, solvent B, anti-aging additive, dispersant, defoaming agent, anti-settling agent, wetting dispersant, aliphatic isocyanate curing agent and diluent B ..The composite coating has excellent adhesive force, salt fog resistance, flexibility and heat reflection efficiency.

Description

technical field [0001] The invention belongs to the technical field of paint coatings, and in particular relates to a self-repairing high-durability anti-corrosion composite coating and a preparation method thereof. Background technique [0002] In the field of industrial anti-corrosion, the current anti-corrosion coatings and anti-corrosion coating systems generally have the disadvantages of short anti-corrosion life and single function. For example, the salt spray resistance of ordinary epoxy antirust primers is generally lower than 600h; the salt spray resistance of ordinary epoxy zinc-rich primers is generally lower than 1500h; the thickness of ordinary epoxy intermediate paints exceeds 100μm, The problem of paint film cracking and falling off is prone to occur when subjected to impact and collision; the artificial accelerated aging resistance of ordinary polyurethane topcoat (UVB313 light source) generally does not exceed 1000h. [0003] During the investigation, it wa...

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Problems solved by technology

[0002] In the field of industrial anti-corrosion, the current anti-corrosion coatings and anti-corrosion coating systems generally have the disadvantages of short anti-corrosion life and single function

For example, the salt spray resistance of ordinary epoxy antirust primer is generally lower than 600h; the salt spray resistance of ordinary epoxy zinc-rich primer is generally lower than 1500h; the thickness of ordinary epoxy intermediate paint exceeds 100μm, The problem of paint film cracking and peeling is prone to occur when subjected to impact and collision; the resistance of ordinary polyurethane topcoats to artificial accelerated aging (UVB313 light source) generally does not exceed 1000h

[0003] During the investigation, it was found that ordinary anti-corrosion coatings only have the function of outdoor weather resistance and anti-corrosion. With the development of the times, it is becoming more and more difficult to meet the multi-functional requirements in many application fields.

For example, when repairing in a humid environment, ordinary coatings cannot solve the contradiction between high anti-corrosion performance and wet surfaces; ordinary epoxy intermediate paints cannot be applied to steel surfaces with certain deformations, and cracks are easy to occur after fine cracks appear in the coating Accelerated expansion leads to coating failure; buildings, vehicles and equipment in hot areas cause huge energy consumption for air conditioning in order to reduce the internal temperature, while ordinary coatings cannot exert significant energy-saving benefits; outdoor areas with severe pollution or long service periods A large amount of dust and pollutants are easily bonded to the surface of the coating, resulting in poor decorative effect of the coating, and some pollutants will erode the coating and reduce the service life of the coating

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