Waterborne epoxy primer of tall oil modified epoxy resin for steel structure and preparation method of waterborne epoxy primer

Abstract

The invention discloses a waterborne epoxy primer of tall oil modified epoxy resin for a steel structure and a preparation method of the waterborne epoxy primer. The waterborne epoxy primer consists of the following raw materials in parts by weight: epoxy resin 50-70 parts, anacardol 14-20 parts, a formaldehyde solution 13-23 parts, isophorone diamine 20-27 parts, KH550 2-4 parts, attapulgite 4-9 parts, a proper amount of 1 mol / L of hydrochloric acid solution, benzyltriethylammoinium chloride 1-1.5 parts, 30% of a sodium hydroxide solution 15-20 parts, a proper amount of deionized water, stearmide 1-2 parts, an epoxide diluent 2-5 parts, tall oil 4-7 parts, phthalic anhydride 3-6 parts, and toluene 10-20 parts. Silicon hydroxyl on the surfaces of the attapulgite and the anacardol are in etherified cross-linking reaction, a modified anacardol aldehyde amine curing agent is prepared through chemical reaction, and therefore, the waterborne epoxy primer not only has the advantages of a common anacardol aldehyde amine curing agent, but also has the advantages of the attapulgite. The prepared epoxy primer has the features of good yellowing resistance, capability of curing at low temperature and excellent anti-corrosion property.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a water-based epoxy primer of tall oil-modified epoxy resin 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-component water-b...

AI Technical Summary

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