Waterbome epoxy resin primer with long-term high corrosion resistance for steel structure and preparation method of primer

Abstract

The invention discloses a waterbome epoxy resin primer with long-term high corrosion resistance for a steel structure. The primer is prepared from, by weight, 50-70 parts of epoxy resin, 15-20 parts of cardanol, 15-25 parts of a formaldehyde solution, 17-24 parts of isophorondiamine, 2-3 parts of KH50, 3-7 parts of attapulgite, an appropriate amount of a hydrochloric acid solution with the concentration being 1 mol / L, 0.8-1.5 parts of benzyl triethyl ammonium chloride, 16-20 parts of a 30% sodium hydroxide solution, an appropriate amount of deionized water, 1-2 parts of stearamide, 1-4 parts of epoxy diluent, 2-5 parts of zinc phosphate, 2-5 parts of aluminum triphosphate and 1-3 parts of zinc yellow. According to the waterbome epoxy resin primer with the long-term high corrosion resistance for the steel structure, silicon hydroxyl on the surface of the attapulgite and cardanol are utilized to generate an etherifying and cross-linking reaction, a modified cardanol aldehyde amine curing agent is prepared through a chemical reaction, the modified curing agent not only has the advantage of an ordinary cardanol aldehyde amine curing agent but also has the advantage of the attapulgite, and the prepared paint has the advantages of being good in yellowing resistance, capable of curing at low temperature and excellent in corrosion resistance.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a water-based epoxy primer with long-term high anti-corrosion performance for steel structures and a preparation method thereof. Background technique [0002] In recent years, the coatings industry in various countries in the world has stepped up research on environmentally friendly coatings with low VOC emissions. Water-based anti-corrosion coatings have greatly reduced or even completely eliminated VOC emissions, and are safe and convenient to use, so as to develop rapidly. The base polymer emulsion used in one-component water-based anti-corrosion coatings is mostly thermoplastic, and the coating film hardness, medium resistance, pollution resistance and other properties are difficult to reach the level of solvent-based industrial coatings. Therefore, in recent years, people have begun to devote themselves to the research of two-component water-based anticorrosion coatings. The two-com...

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Problems solved by technology

However, since the phenolic hydroxyl group -OH in the cardanol molecule does not participate in the reaction, the modified curing agent contains phenolic hydroxyl groups of weak acids, making the coating film easy to be oxidized and poor in alkali resistance, easy to absorb ultraviolet light, and copolymerize. Yellowing of cured epoxy coatings is particularly severe