Novel water-based epoxy anticorrosive coating and preparation method thereof

[0016] figure 1 It is a process step diagram of the preparation method of the new waterborne epoxy anticorrosive coating in the embodiment of the present invention; the anticorrosive coating is prepared by mixing the A component let down and the B component curing material. The preparation method includes the following steps: a) Preparation Take the A-component color paste, b) prepare the A-component letdown, c) prepare the B-component curing material, and d) mix the A and B components to prepare the coating.

[0017] The new water-based epoxy anticorrosive coating mentioned in the present invention uses water-based epoxy resin emulsion and water-based modified amine curing agent as base materials, and uses suitable film-forming additives, dispersants, defoamers, leveling agents and other additives. The active anticorrosive pigment compounded by aluminum tripolyphosphate and zinc phosphate is used for preparation. The prepared waterborne epoxy anticorrosive coating has good environmental performance, and its anticorrosion performance reaches or approaches that of similar foreign products, and has a broad market application prospect. Among them, the mass ratio of aluminum tripolyphosphate to zinc phosphate in the active anti-rust pigment is 3:1; the active anti-rust pigment has high solubility, can generate a large osmotic pressure and generate bubbles, and dissolve in an aqueous system Phosphate, polyphosphate, thus play a certain passivation effect; it can play a stronger protective effect in synergy with inert anti-rust pigments. Ethylene glycol monobutyl ether is selected as the film-forming auxiliary agent, which is adsorbed on the emulsion particles in the coating, helps the curing agent molecules to diffuse and penetrate into the emulsion particles, assists the film-forming process, and then volatilizes into the air at a suitable rate In this way, the mechanical strength and corrosion resistance of the coating are not affected.

[0018] Example 1

[0019] The specific preparation method is as follows:

[0020] a) To prepare A component color paste, the specific preparation process is as follows: first weigh 2.2% iron oxide red, 10% rutile titanium dioxide, 20% precipitated barium sulfate, 3.1% mica powder by weight percentage, 14% active anti-rust pigment, 0.4% BYK-110 wetting and dispersing agent, 0.3% BYK-034 defoaming agent, 50% deionized water; then the wetting and dispersing agent, defoaming agent and deionized water Mix to obtain an auxiliary agent mixture; then put iron oxide red, rutile titanium dioxide, precipitated barium sulfate, mica powder and active anti-rust pigment into the auxiliary agent mixture, and grind it with a sand mill to a fineness of less than 30um to obtain A component color paste.

[0021] b) To prepare A component letdown, the specific preparation process is as follows: first weigh 45% A component color paste, 50% water-based epoxy resin emulsion, 4.5% ethylene glycol monobutyl ether film-forming aid Agent, 0.1% BYK-110 wetting and dispersing agent, 0.1% BYK-348 leveling agent, 0.05% BYK-034 defoamer, 0.1% Deqian FA179 flash inhibitor, 0.15% Deqian 202P Rheology additives; then put the above-mentioned raw materials into a stirring vessel and mix, stir for 45 minutes under stirring conditions of 55°C and 400r/min, filter out the material, and obtain the A component let down.

[0022] c) To prepare the B-component curing material, first weigh 64% Huntsman Aradur 3230 modified amine curing agent and 36% deionized water by weight percentage, then put the modified amine curing agent and deionized water into Stir and mix uniformly in the stirring container, and obtain the B-component solidified material after filtration.

[0023] d) Mix the A and B components to prepare the coating, put the A component let down prepared in step b) and the B component cured material prepared in step c) into a mixing container at a mass ratio of 20:3. ℃, 250r/min stirring conditions for 30 minutes to obtain excellent performance anti-corrosion coating.

[0024] Example 2

[0025] The specific preparation method is as follows:

[0026] a) To prepare A component color paste, the specific preparation process is as follows: first weigh 2.8% iron oxide red, 12% rutile titanium dioxide, 22% precipitated barium sulfate, 4.1% mica powder by weight percentage, 16% active anti-rust pigment, 0.6% BYK-110 wetting and dispersing agent, 0.5% BYK-034 defoamer, 42% deionized water; then wetting and dispersing agent, defoaming agent and deionized water Mix to obtain an auxiliary agent mixture; then put iron oxide red, rutile titanium dioxide, precipitated barium sulfate, mica powder and active anti-rust pigment into the auxiliary agent mixture, and grind it with a sand mill to a fineness of less than 30um to obtain A component color paste.

[0027] b) To prepare A component letdown, the specific preparation process is as follows: first weigh 48% A component color paste, 45% water-based epoxy resin emulsion, and 6% ethylene glycol monobutyl ether film-forming aid. Agent, 0.2% BYK-110 wetting and dispersing agent, 0.2% BYK-348 leveling agent, 0.1% BYK-034 defoamer, 0.2% Deqian FA179 flash inhibitor, 0.3% Deqian 202P Rheology additives; then put the above-mentioned raw materials into a stirring vessel and mix, stir for 45 minutes under stirring conditions of 55°C and 400r/min, filter out the material, and obtain the A component let down.

[0028] c) To prepare the B-component curing material, first weigh 64% Huntsman Aradur 3230 modified amine curing agent and 36% deionized water by weight percentage, then put the modified amine curing agent and deionized water into Stir and mix uniformly in the stirring container, and obtain the B-component solidified material after filtration.

[0029] d) Mix the A and B components to prepare the coating, put the A component let down prepared in step b) and the B component cured material prepared in step c) into a mixing container at a mass ratio of 5:1. ℃, 250r/min stirring conditions for 30 minutes to obtain excellent performance anti-corrosion coating.

[0030] The invention discloses a new type of waterborne epoxy anticorrosive paint and a preparation method thereof. The anticorrosive paint has good environmental protection performance. Through suitable ingredients and dosage ratio, the anticorrosion performance of the paint is greatly improved and has high market application value.