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Trang Chủ > Thông tin ngành > Advantages of waterborne epoxy rust and anticorrosive coatings
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Advantages of waterborne epoxy rust and anticorrosive coatings

2019-09-04
The simplest and most effective method to prevent corrosion in steel structure facilities is to use paints for protection. Traditional oil paints, commonly referred to as paints, have a very serious environmental pollution due to the large amount of organic solvents. Therefore, water-based paints, mainly water-based paints based on epoxy resins, are the research directions of the paint industry in the world. One of them, the output of water-based coatings in developed countries has reached more than 50% of the total output of coatings, and the demand for water-based coatings in China has been increasing at a rate of more than 10% per year. The development and use of epoxy resin waterborne coatings for corrosion protection of steel with rust, a huge space.

Waterborne epoxy resin with rust and anticorrosion coating is a new type of paint that can be directly painted on the surface of steel with residual rust, which not only reduces the heavy rust removal workload but also saves construction costs, but also increases labor productivity and improves the labor environment. To avoid environmental pollution. According to experts from the China Epoxy Resin Industry Association, waterborne epoxy resin with rust and anticorrosive coatings is a tool for corrosion protection of steel structures. Because of its outstanding performance in environmental protection, the significance of building a resource-based society today is even more significant. In addition, from a technical point of view, the waterborne rust-resistant anticorrosion coating is a self-drying coating. Its performance indicators and test results are superior to phenolic antirust paints and alkyd anticorrosive paints. It has excellent salt water resistance, corrosion resistance, and strong adhesion. Tough and firm, it can be used with the same type of topcoat, especially it uses water as the solvent without toxic, non-flammable, non-explosive, less environmental pollution, convenient storage and transportation, simple construction coating, and safe and reliable use.

General paints require thorough derusting when the surface of the steel is coated. In particular, water-based paints require stricter derusting. Rust removal is a very arduous task that consumes a lot of man hours and increases costs. It is reported that the proportion of steel plate coating cost allocation is: surface derusting 42%, construction 30%, coating 19%. The rust layer on the surface of steel is a loose porous structure with water in terms of its structure. In terms of composition, it is a stable mixture of harmless iron compounds and harmful iron compounds. Water-based epoxy rust-proof anti-corrosion coating uses epoxy resin with good permeability as the base material. The penetration of the penetrant enables the coating to have good permeability, thereby infiltrating and infiltrating the entire porous rust layer, so that the rust layer Bonding becomes a continuous closed coating to seal the entire rust layer and the steel surface. Water-based epoxy rust-resistant anti-corrosion coatings rely on the reactive groups of the epoxy resin in the coating. The reactive pigments or rust transforming agents react with active and harmful components in the rust layer to form stable inhibitory compounds, thus making the entire rust layer stable in the coating. Fillers. The appropriate proportion of various active and anti-rust materials in the coating and the matching of the filler can make the entire rust layer have better rust resistance, durability and physical and mechanical properties. In short, the waterborne epoxy rust anticorrosion coating must not only have good adaptability to the rusted steel surface, but also form an etched film capable of resisting corrosion on the smooth steel surface, thus playing an anti-rust effect.

Waterborne epoxy rust-preventing paints are mainly mixtures of waterborne epoxy resin emulsions and filler particle dispersions, through the addition of various performance additives such as thickeners, dispersants, film-forming aids, anti-mold agents, and corrosion inhibitors. Agents, leveling agents and other additives to achieve the required construction performance, film quality and stable storage period. Experts of China Epoxy Resin Industry Association introduced a production process of waterborne rust and anticorrosion coating: adding water to the ball mill, and adding the dispersant, anti-mildew fungicide, corrosion inhibitor, antifoaming agent and wetting agent in the formula. The ball mill is stirred for a period of time, then the pigment filler is gradually added, the ball mill is added for 2 to 3 hours, part of the emulsion is added, and the ball mill is performed for 1 to 2 hours. When the fineness reaches 60 μm, the semi-finished product in the ball mill is transferred to the high-speed disperser, and the remaining emulsion is added. Membrane additives and other additives, high-speed mixing evenly dispersed, after testing the technical indicators qualified after packaging products. Water-based epoxy rust-resistant anti-corrosion coating has strong permeability and adhesion on steel with rust. It has excellent weatherability and acid and alkali resistance. It also has good antirust effect on rust-free metal surfaces; it can be directly coated on rusted steel. On the substrate, there is no need to coat the finish; no poison, no pollution, no burning. The coating can be used for large-scale metal structures that are difficult to surface-treat, such as bridges, guardrails, large machinery, metal doors and windows, chemical pipelines, and pipe racks in production plants.

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