Aqueous epoxy corrosion-resistant coating for mechanical equipment and preparation method of aqueous epoxy corrosion-resistant coating

Abstract

The invention relates to an aqueous epoxy corrosion-resistant coating for mechanical equipment. According to the aqueous epoxy corrosion-resistant coating, a component A comprises an aqueous epoxy resin emulsion, a rheological agent, a wetting and dispersing agent, a defoaming agent, an organic preservative, an inorganic anti-rust pigment, a pigment filler, deionized water and a film-forming aid, a component B comprises an aqueous polyamine-epoxy resin adduct, deionized water, a silane coupling agent, a promoter and a reactive epoxy toughening agent, and the aqueous epoxy corrosion-resistant coating is prepared by preparing the component A, preparing the component B and mixing the component A and the component B. Test results show that under the situation of coating a 150mu m wet film, the surface drying time is less than 40min, the solid drying time is less than 12h, the thickness of a dry film is 80mu m, a coating has no cracks under the impact condition of 120kg.cm, an anti-flash rust agent which produces harm to a human body or an environment is eliminated, and the aqueous epoxy corrosion-resistant coating is environment-friendly and high in safety.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based epoxy anticorrosion coating for mechanical equipment and a preparation method thereof. Background technique [0002] The commonly used anti-corrosion coatings for mechanical equipment are solvent-based epoxy coatings. Since the coating industry will limit the use of high organic volatile VOCs and harmful air HAPs in the future, high-solid and water-based coatings have become the development direction of future coatings. [0003] Water-based epoxy anti-corrosion coatings have many advantages, such as low VOC content, low odor, safe to use, can be cleaned with water, and meet the requirements of environmental protection and energy saving, etc. However, water-based epoxy anti-corrosion coatings used in the mechanical equipment coating market are not common , the reason is that it cannot meet the coating requirements of mechanical equipment, such as rapid c...

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Problems solved by technology

[0003] Water-based epoxy anti-corrosion coatings have many advantages, such as low VOC content, low odor, safe to use, can be cleaned with water, and meet the requirements of environmental protection and energy saving, etc. However, water-based epoxy anti-corrosion coatings used in the mechanical equipment coating market are not common , the reason is that it cannot meet the coating requirements of mechanical equipment, such as rapid curing at room temperature, mechanical properties and anti-corrosion properties, etc.

[0004] Chinese patent CN 102399350A discloses a preparation method of water-based epoxy acrylic resin, which uses inorganic acid to modify epoxy resin to generate epoxy ester, and then reacts with acrylic acid monomer to make homogeneous water-based epoxy acrylic resin Resin, the resin is neutralized to pH 7-8 by organic amine during preparation, although the invention combines the advantages of water-based acrylic resin and water-based epoxy resin, the prepared modified water-based epoxy resin paint needs to be baked at high temperature Film formation, and the adhesion and anti-corrosion performance indicators are not high

[0005] Chinese patent CN 102827529A discloses an iron red water-based epoxy anti-rust paint and its preparation method. The anti-rust paint uses E51 resin, water-based polymer amines and water-based polyamide resin as film-forming materials, which can be cured at room temperature. The construction performance and anti-corrosion performance are good, but the surface-drying time of the paint film is 2 hours, and the hard-drying time is more than 15 hours, which cannot meet the coating requirements of mechanical equipment products. At the same time, its brittleness is also strong, and the paint film will be damaged and peeled off after being subjected to rapid impact or bumping, which increases the process of re-coating or re-coating

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