CN115368805A

CN115368805A - Aqueous bi-component matching paint and preparation method and application thereof

Info

Publication number: CN115368805A
Application number: CN202211149342.0A
Authority: CN
Inventors: 王荣芳; 姚煌; 许奕祥; 谢唯; 王从国
Original assignee: Qingtian Material Technology Co ltd
Current assignee: Qingtian Material Technology Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-11-22
Anticipated expiration: 2042-09-21
Also published as: CN115368805B

Abstract

The invention discloses a water-based double-component matching paint and a preparation method and application thereof, wherein the water-based double-component matching paint comprises a water-based double-component primer and a water-based double-component finish paint; the water-based bi-component primer is composed of a specific component A and a specific component B, the water-based bi-component finish paint is composed of a specific component C and a specific component D, wherein the mass ratio of the component A to the component B is 6.5-7.5, and the mass ratio of the component C to the component D is 8. The aqueous bi-component matching paint disclosed by the invention is not only suitable for large-scale mechanical equipment and wet-on-wet processes, but also can be used for quickly preparing a paint film which is environment-friendly, flat in surface, good in gloss, salt mist resistant, boiling resistant, good in adhesive force and good in initial water drop resistance test performance, and is also suitable for large-scale production.

Description

Aqueous bi-component matching paint and preparation method and application thereof

Technical Field

The invention relates to the technical field of coatings, in particular to a water-based two-component matching paint and a preparation method and application thereof.

Background

The performance of the material in an environment of being subjected to rain can be well simulated by the water drop resistance, so that the water drop resistance is different from the goals of the traditional boiling resistance (40 ℃ water resistance), salt spray resistance, adhesive force performance and other related tests.

After the whole machine of large-scale mechanical equipment is assembled, the problems of incomplete spraying or poor durability and the like often exist due to large volume, complex shapes of parts, more spraying dead angles and difficult coating. Meanwhile, the coating is easy to be corroded by corrosive media such as water, gasoline, engine oil, acid and alkali in subsequent working environments, and strict technical requirements are provided for the protective property and the construction property of the coated water-based protective coating. Meanwhile, in order to meet higher environmental protection requirements in production, large-scale mechanical equipment manufacturers begin to adopt a two-component composite coating system of a waterborne epoxy primer matched with an acrylic polyurethane finish and a 2B1C (wet-on-wet) coating mode with the advantages of cost reduction and efficiency improvement.

At present, for large-scale mechanical equipment, because the production field is limited and the large-scale mechanical equipment which is coated is required to be prepared in batch, the large-scale mechanical equipment which is just prepared and has an unreacted composite coating is usually placed outdoors, and the large-scale mechanical equipment which is just coated has the problem that the large-scale mechanical equipment cannot withstand natural environment tests such as sun exposure and rain exposure.

Therefore, the development of a water-based two-component matching paint which has good dripping resistance, is suitable for wet-on-wet coating and is suitable for mass production is extremely important.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention aims to provide a water-based two-component matching paint and a preparation method and application thereof.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a water-borne two-component paint formulation comprising a water-borne two-component primer paint and a water-borne two-component topcoat paint; the water-based double-component primer consists of a component A and a component B, and the water-based double-component finish paint consists of a component C and a component D;

the component A comprises the following raw materials in percentage by mass: water-based epoxy resin: 35% -45%, first auxiliary agent: 2% -10%, first pigment and filler: 35% -45%, propylene glycol methyl ether: 1% -5%; the component B comprises the following raw materials in percentage by mass: aqueous epoxy curing agent: 60% -70%, propylene glycol methyl ether: 15% -25%; the component C comprises the following raw materials in percentage by mass: aqueous hydroxyacrylic acid dispersion: 45% -55%, a second auxiliary agent: 5-15%, water-based functional resin: 6% -8%, second pigment and filler: 20% -30%, dipropylene glycol butyl ether: 3% -9%; the component D comprises the following raw materials in percentage by mass: isocyanate curing agent: 75% -82%, propylene glycol diacetate: 15% -22%, dehydrating agent: 1% -5%;

wherein the mass ratio of the component A to the component B is 6.5-7.5.

In the invention, the component A and the component B adopt propylene glycol methyl ether with lower boiling point as a cosolvent, so that the aqueous epoxy curing agent in the component B has good solubility, the aqueous epoxy resin in the component A has good dispersibility, the component A and the component B are favorably mixed and dispersed, the primer can have higher surface drying speed in the later use process, the flash drying time of a wet-on-wet process is shortened, and the poor dripping water resistance and salt spray resistance caused by paint film defects such as bottom biting, miliaria and the like caused by the primer which is dried slowly but not dried to the finish paint are reduced.

Preferably, the A component, the B component and the C component also comprise water.

Further preferably, the water in the component A, the component B and the component C is distilled water.

Preferably, the component A comprises the following raw materials in percentage by mass: water-based epoxy resin: 38% -42%, first auxiliary agent: 4% -8%, first pigment and filler: 38% -42%, propylene glycol methyl ether: 2% -4%, water: 5% -20%;

the component B comprises the following raw materials in percentage by mass: aqueous epoxy curing agent: 60% -70%, propylene glycol methyl ether: 15% -25%, water: 10% -20%;

the component C comprises the following raw materials in percentage by mass: aqueous hydroxyacrylic acid dispersion: 48-52%, second auxiliary agent: 6-12%, water-based functional resin: 6% -8%, second pigment and filler: 23% -27%, dipropylene glycol butyl ether: 5% -7%, water: 3% -8%;

the component D comprises the following raw materials in percentage by mass: isocyanate curing agent: 75% -82%, propylene glycol diacetate: 15% -22%, dehydrating agent: 1% -5%;

wherein the mass ratio of the component A to the component B is 7.

Preferably, the aqueous epoxy resin in the A component is an aqueous epoxy emulsion.

Preferably, the solid epoxy equivalent weight in the aqueous epoxy emulsion is between 480g/mol and 560g/mol.

Preferably, the solid content in the aqueous epoxy emulsion is 50-55%.

Preferably, the aqueous epoxy emulsion is selected from one of E-pos1025, PZ 3961, 3EE109W, BC 2060.

Further preferably, the aqueous epoxy emulsion is selected from E-pos1025.

Specifically, the E-pos1025 is a water-based epoxy emulsion of novel polymer materials GmbH in Changzhou Borui, the solid content is 50% -55%, the solid epoxy equivalent is 490-550 g/mol, and the solid content and solid epoxy equivalent of the water-based epoxy emulsion of PZ 3961, 3EE109W and BC 2060 are similar to those of the E-pos1025, so that the primer can show excellent corrosion resistance, quick drying property and hardness growth property.

Preferably, the first auxiliary agent in the component A consists of a dispersing agent COADIS 123K, a wetting agent DYNOL607, a wetting agent EFKA3772, a defoaming agent AC-202, a thickening agent RASE-60, a flash rust inhibitor HOS FRI 1203 and a coupling agent MOAP 1316.

Specifically, the dispersant COADIS 123K in the component A is COADIS 123K of Coatex company, is a special modified potassium polycarboxylate, and is a multifunctional hydrophobic high-water-resistance dispersant. The wetting agent in the component A adopts a mixture of DYNOL607 of American gas chemical products (China) limited company and EFKA3772 of an automobile Effka auxiliary agent, wherein the EFKA3772 belongs to fluorocarbon modified polyacrylic acid and has a good leveling effect; DYNOL607 is an acetylenic diol surfactant, has extremely low dynamic and static surface tensions, low levels of foaming and good compatibility, and has good wetting ability on large mechanical equipment component substrates. The coating and the paint are mixed for use, so that the appearance of the paint film and the compactness of the coating can be ensured, and the water dripping resistance of the paint film is improved. The defoamer in the component A is AC-202 of a special auxiliary agent factory in the city of Linan and is a hydrophobic modified mineral oil surfactant, has efficient and lasting defoaming and foam inhibiting performances, and the hydrophobic structure of the defoamer contributes to the water resistance of the coating. The thickener in the component A is RASE-60 of Tianjin Ruizxue chemical Co., ltd, is methacrylic acid copolymer emulsion, and has high sagging prevention performance after being mixed with the waterborne epoxy curing agent YG-F300 with the active hydrogen equivalent of 300 in the component B. Therefore, the component A with proper viscosity and fluidity can be compounded by selecting proper dispersing agent, wetting agent and defoaming agent and the silane coupling agent MOAP 1316 of the flash rust inhibitor HOS FRI 1203 (manufacturer: shanghai Holshi Kogyo Co., ltd.) and Shanghai Mohr chemical industry Co., ltd which do not contain nitrite, and a foundation is laid for preparing a matched paint film with good initial water drop resistance.

Preferably, the mass ratio of the wetting agent DYNOL607 to the wetting agent EFKA3772 is 1.

Further preferably, the mass ratio of the wetting agent DYNOL607 to the wetting agent EFKA3772 is 2.

Preferably, the first pigment and the filler in the A component consist of bentonite, zinc phosphate, aluminum tripolyphosphate, magnesium silicate, barium sulfate, titanium dioxide, carbon black and iron yellow.

Preferably, the mass ratio of the bentonite to the zinc phosphate to the aluminum tripolyphosphate to the magnesium silicate to the barium sulfate to the titanium dioxide to the carbon black to the iron oxide yellow is 0.2:6:4:4:20.9:2.2:1.5:1.2.

specifically, the first pigment and the filler in the component A comprise an antirust pigment (zinc phosphate and aluminum tripolyphosphate) and a filler (bentonite, magnesium silicate, titanium dioxide barium sulfate, carbon black and iron yellow), and if the dosage of the antirust pigment is too small, the ion release concentration is low, so that the antirust pigment is not enough to completely passivate a metal substrate to have an anticorrosion effect or has a poor anticorrosion effect; if the dosage of the anti-rust pigment is too much, the ion release concentration is too high, the instability of the system is caused, and meanwhile, the too much anti-rust pigment easily causes insufficient wetting and wrapping of the resin, the integral performance of the system is reduced, so the dosage of the anti-rust pigment is also very critical.

Preferably, the waterborne epoxy curing agent in the B component is an aliphatic polyamine curing agent with the active hydrogen equivalent weight of 250-350.

Further preferably, the aliphatic polyamine curing agent with the active hydrogen equivalent of 250-350 is YG-F300 of Beijing sunshine Vigord environmental protection technology Co.

Specifically, YG-F300 of Beijing sunshine Vigord environmental protection science and technology Limited is a non-ionic amine curing agent, which is an aliphatic polyamine curing agent with active hydrogen equivalent of 300, and is beneficial to quick drying of a later-stage paint film, high crosslinking speed, excellent salt fog resistance and excellent initial water resistance.

Specifically, in the aqueous bi-component primer, the increase of the amount of the aqueous epoxy curing agent in the component B is beneficial to improving the curing speed and the crosslinking density and improving the drying speed and the dripping resistance of a coating film, but with the increase of the amount of the curing agent, the excessive curing agent cannot diffuse into epoxy resin particles to participate in the crosslinking reaction and remains in the coating film to form a hydrophilic medium, so that the dripping resistance and the salt spray resistance of the coating are reduced; and the excessive amine curing agent of the primer can directly react with the isocyanate curing agent in the finish paint preferentially to cause the problems of bottom biting and miliaria of the waterborne polyurethane finish paint, so that the dripping water resistance and the salt mist resistance of the composite coating are influenced, and the using amount of the waterborne epoxy curing agent is a key technical parameter.

Preferably, the aqueous hydroxy acrylic acid dispersion in the component C is one selected from YG-AD543, PA-3330, KT-8473, AQUAPAC-8225 and Antkote 2025.

Further preferably, the aqueous hydroxyacrylic dispersion in component C is AQUAPAC-8225, jiang fuqisen new materials, inc.

Specifically, the AQUAPAC-8225 is an aqueous hydroxyl acrylic dispersion having a hydroxyl number of 2.5%.

Preferably, the second auxiliary agent in the component C consists of a dispersing agent Addigital DX 774, a wetting agent BD-3033, a defoaming agent UNIQ FOAM LP2565, a defoaming agent BYK-028 and a thickening agent Addigital WS.

Preferably, the mass ratio of the dispersing agent Addigital DX 774, the wetting agent BD-3033, the defoaming agent UNIQ FOAM LP2565, the defoaming agent BYK-028 and the thickening agent Addigital WS is 3:2.2:1.5:0.5:0.8.

specifically, the dispersing agent Addigital DX 774, the wetting agent BD-3033, the defoaming agent UNIQ FOAM LP2565, the defoaming agent BYK-028 and the thickening agent Addigital WS are all aqueous auxiliary agents, so that the self-action can be exerted in an aqueous system, and the performances of adhesion firmness, 40 ℃ water resistance, initial water drop resistance and the like of the finish paint can be improved under the condition of specific dosage.

More specifically, in the component C, the defoaming type organosilicon defoamer UNIQ FOAM LP2565 of Youka chemical (Shanghai) limited company is matched with the defoaming type organosilicon defoamer BYK-028 of Bike chemical for use, so that bubbles entrained by a paint film in the production and construction processes are quickly removed, and the integrity of the paint film is ensured, thereby improving the dripping resistance. The wetting agent in the component C is BD-3033 of Bauder organosilicon Co., ltd, hangzhou, is polyether modified polysiloxane, and improves the leveling and glossiness of a paint film while reducing the surface tension of the paint. The functions of different raw materials are difficult to exert due to the addition of a large amount of raw materials, and all raw materials in the component C designed by the invention can act synergistically, so that a paint film prepared by the final paint set has the advantages of good integrity, good glossiness, salt spray resistance, 40 ℃ water resistance, initial water dripping resistance and the like.

Preferably, the aqueous functional resin in the C component is YG-HBP075.

Specifically, the YG-HBP075 manufacturer is Beijing sunshine Vigord environmental protection science and technology, is a hyperbranched polymer, has a solid hydroxyl value of 335mgKOH/g-365mgKOH/g, can participate in a crosslinking reaction, and improves crosslinking density, thereby improving water resistance and chemical resistance of a paint film.

Preferably, the second pigment and the filler in the component C consist of barium sulfate, titanium dioxide, carbon black and iron yellow.

Preferably, the mass ratio of the barium sulfate to the titanium dioxide to the carbon black to the iron oxide yellow is 20.1:2.2:1.5:1.2.

specifically, the composition of the second pigment and the filler in the component C is similar to that of the first pigment and the filler in the component A in a certain degree, and the purpose is to control the composition and the using amount of the filler, so that the viscosity and the adhesive force of the primer and the finish paint are similar, and the primer and the finish paint can be well used together in the aspects of gloss, color and other functions, thereby laying a foundation for forming the water-based paint set.

Preferably, the isocyanate curing agent in the component D is selected from one of OS-9018, OS-9030, aquolin-269, AQUAPU-360, WT31-100 and X5277.06.

Further preferably, the isocyanate curing agent in the component D is selected from isocyanate X5277.06 of Asahi chemical Co.

Specifically, the isocyanate X5277.06 is hydrophobic aliphatic isocyanate with stable isocyanurate ring, and can be well dispersed and tightly wrapped in polyurethane polyol particles when being used in the formula system of the invention, so that the water-resistant finishing paint has good water isolation, the drying rate of the finishing paint is improved, and a paint film has good water resistance in the early stage.

Preferably, the dehydrating agent in the D component is BF-5 dehydrating agent.

In a second aspect, the present invention provides a method of preparing an aqueous two-component paint formulation according to the first aspect, comprising the steps of:

1) Preparation of the component A: mixing the water-based epoxy resin, the first auxiliary agent, propylene glycol methyl ether, the first pigment and the filler according to the mass fraction of the first aspect to obtain a component A;

2) Preparation of the component B: mixing the water-based epoxy curing agent and propylene glycol methyl ether according to the mass fraction of the first aspect to obtain a component B;

3) Preparation of component C: mixing the aqueous hydroxyl acrylic acid dispersoid, a second auxiliary agent, aqueous functional resin, a second pigment, a filler and dipropylene glycol butyl ether according to the mass fraction to obtain a component C;

4) Preparation of component D: mixing an isocyanate curing agent, propylene glycol diacetate and a dehydrating agent according to the mass fraction of the first aspect to obtain a component D;

5) And mixing the component A and the component B according to the mass ratio of the first aspect to obtain a water-based two-component primer, and mixing the component C and the component D according to the mass ratio of the first aspect to obtain a water-based two-component finish.

Preferably, the preparation method of the aqueous two-component matching paint further comprises the following steps: controlling the ratio of Pigment Volume Concentration (PVC) to Critical Pigment Volume Concentration (CPVC) in the waterborne two-component primer to be 1.1:1.

specifically, the permeability of the paint film is related to the quality of the formed film, after the waterborne two-component primer reaches the CPVC, the film forming matter is not enough to completely wet and wrap the pigment and filler particles, pores are formed in the paint film, the permeability starts to increase rapidly, the osmotic pressure difference is reduced gradually, and the foaming tendency during dripping is reduced, so that the ratio of the Pigment Volume Concentration (PVC) to the Critical Pigment Volume Concentration (CPVC) in the waterborne two-component primer is controlled by controlling the dosage of barium sulfate in the component A, and the effect of improving the initial water drop resistance of the final paint film is realized.

Preferably, the preparation of the component A specifically comprises the following steps:

s1: stirring and mixing part of waterborne epoxy resin E-pos1025, water, a dispersing agent COADIS 123K, part of a defoaming agent AC-202, a wetting agent DYNOL607 and propylene glycol monomethyl ether to obtain a first mixture;

s2: adding bentonite, zinc phosphate, aluminum tripolyphosphate, magnesium silicate, barium sulfate, titanium dioxide, carbon black and iron yellow into the first mixture, stirring and mixing, and grinding to obtain a primer color paste;

s3: mixing the residual waterborne epoxy resin E-pos1025, the wetting agent EFKA3772, the residual defoaming agent AC-202, the silane crosslinking agent MOAP 1316, the flash rust inhibitor HOS FRI 1203, the thickening agent RASE-60 and the primer color paste in the S2 to obtain a component A;

wherein the added raw materials in S1, S2 and S3 are all added according to the mass fraction in the first aspect;

the waterborne epoxy resin E-pos1025 and the defoaming agent AC-202 are added in two steps, and the mass ratio of the waterborne epoxy resin E-pos1025 in S1 and S3 is 3:5, the mass ratio of the defoaming agent AC-202 in the S1 and the S3 is 3:1.

preferably, in the preparation process of the component A, the stirring in the S1 is carried out at the rotating speed of 300 r/min-400 r/min, and the stirring time is 5 min-10 min.

Preferably, in the preparation process of the component A, the stirring in the step S2 is carried out at the rotating speed of 800 r/min-1000 r/min, and the stirring time is 10 min-15 min.

Preferably, in the preparation process of the component A, the grinding in S2 is to grind the mixture to a particle size of less than 25 μm, particularly by using a sand mill at a temperature of 15-45 ℃.

Preferably, the specific operation of mixing in S3 is stirring under the condition of 500 r/min-1000 r/min during the preparation of the A component.

Preferably, the preparation of the B component specifically comprises the following steps: and stirring and mixing the YG-F300 waterborne epoxy curing agent, the PM cosolvent and the water for 5-10min at the rotating speed of 300-400 r/min according to the mass fraction of the first aspect to obtain the component B.

Preferably, the preparation of the C component specifically comprises the following steps:

s1: stirring and mixing part of aqueous hydroxyl acrylic acid dispersoid AQUAPAC-8225, water, dispersant Addigital DX 774, defoamer UNIQ FOAM LP2565 and wetting agent BD-3033 to obtain a second mixture;

s2: adding barium sulfate, titanium dioxide, carbon black and iron yellow into the second mixture, and stirring and grinding to obtain finish paint color paste;

s3: mixing the residual aqueous hydroxyl acrylic acid dispersoid AQUAPAC-8225, aqueous functional resin YG-HBP075, residual wetting agent BD-3033, defoaming agent BYK-028, dipropylene glycol butyl ether, thickening agent Addigital WS and finish paint color paste in S2 to obtain a component C;

the aqueous hydroxyl acrylic acid dispersion AQUAPAC-8225 and the wetting agent BD-3033 are added in two steps, and the mass ratio of the aqueous hydroxyl acrylic acid dispersion AQUAPAC-8225 in S1 and S3 is 2:3, the mass ratio of BD-3033 in S1 and S3 is 6:5.

preferably, in the preparation process of the component C, the stirring in the step S1 is carried out at the rotating speed of 300 r/min-400 r/min, and the stirring time is 5 min-10 min.

Preferably, in the preparation process of the component C, the stirring in the S2 is carried out at the rotating speed of 800 r/min-1000 r/min, and the stirring time is 10 min-15 min.

Preferably, in the preparation process of the component C, the grinding in S2 is to grind the mixture to a particle size of less than 10 μm at a temperature of 15-45 ℃ by using a sand mill.

Preferably, in the preparation process of the component C, the mixing in the step S3 is specifically performed under the condition of stirring at 500 r/min-1000 r/min.

Preferably, the preparation of the component D specifically comprises the following steps: according to the mass fraction of the first aspect, stirring and mixing the isocyanate curing agent X5277.06, propylene glycol diacetate and dehydrating agent BF-5 at the rotating speed of 300-400 r/min for 5-10min to obtain the component D.

In a third aspect, the present invention provides the use of an aqueous two-component paint set according to the first aspect for the preparation of a large equipment paint coating.

In a fourth aspect, the present invention provides the use of the aqueous two-component paint formulation of the first aspect for the preparation of a coating on a metallic or alloy material.

Preferably, the method of application comprises the following steps:

1) Spraying a metal material or an alloy material with a primer in the aqueous two-component matching paint of the first aspect to obtain a primer-sprayed material;

2) And (2) flashing the primer-sprayed material in the step 1), spraying the finish paint in the aqueous double-component matching paint in the first aspect, leveling, baking and standing to obtain the primer-and-finish-sprayed material.

Preferably, the placing in the step 2) is carried out for 60 to 120 hours under the conditions that the temperature is 20 to 25 ℃ and the humidity is 30 to 85 percent.

More preferably, the standing in the step 2) is carried out for 72 hours under the conditions that the temperature is 20-25 ℃ and the humidity is 30-85%.

Preferably, the flash drying of step 2) is carried out at a temperature of 25 ℃ and a humidity of 50%.

Preferably, the flash drying time in the step 2) is 15 min-25 min.

Preferably, the leveling in the step 2) is performed at a temperature of 20-25 ℃, and the leveling time is 8-15 min.

Preferably, the baking in the step 2) is performed at a temperature of 40 ℃ to 60 ℃, and the baking time is 25min to 30min.

The invention has the beneficial effects that: the aqueous bi-component matching paint disclosed by the invention is not only suitable for large-scale mechanical equipment and wet-on-wet processes, but also can be used for quickly preparing a paint film which is environment-friendly, flat in surface, good in gloss, salt mist resistant, boiling resistant, good in adhesive force and good in initial water drop resistance test performance, and is also suitable for large-scale production. The method specifically comprises the following steps:

(1) The water-based bi-component matching paint provided by the invention can be used for preparing a composite coating with good water drop resistance through a short placing time; the concrete points are as follows: the water-based double-component matching paint can be used for spraying matching finish paint after the primer is sprayed and then is flashed for 20min in an environment with the temperature of 25 ℃ and the humidity of 50%; the finish paint is dried and flowed for 10min at the temperature of 25 ℃, and is baked for 30min at the temperature of 40 ℃; then placing the composite coating for a short time at room temperature (20-25 ℃) and humidity of 30-85% (the placing time is 3h, the initial drip-proof test of the material sprayed with the matched paint can pass 168h, and the composite coating does not foam or change color;

(2) The water-based two-component matching paint provided by the invention has excellent anti-corrosion performance, and according to the baking condition of (1), after the curing is completed, the neutral salt spray resistance can reach 720h, so that the paint can provide good appearance and simultaneously can provide excellent anti-corrosion capability for large-scale mechanical equipment, vehicle parts and other coating base materials;

(3) According to the water-based two-component matching paint provided by the invention, through reasonably controlling various components and dosage in a formula and a preparation method, a paint film with excellent performances such as good glossiness, impact resistance, strong adhesion, initial water resistance of not less than 240h, water resistance at 40 ℃ of not less than 240h, neutral salt mist resistance of 720h, initial water dripping resistance of 168h and the like can be prepared.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

In the following examples, "%" used are mass fractions unless otherwise specified.

Example 1

The embodiment provides a water-based two-component matching paint which comprises a primer and a finish, wherein the primer comprises a component A and a component B, and the finish comprises a component C and a component D;

the component A comprises the following raw materials in percentage by mass:

waterborne epoxy resin E-pos1025:40 percent;

dispersant COADIS 123K:2 percent;

defoaming agent AC-202:0.4 percent;

wetting agent: 0.3 percent;

first pigment and filler: 40 percent;

silane crosslinker MOAP 1316:1.2 percent;

flash rust inhibitor HOS FRI 1203:1.0 percent;

thickener RASE-60:0.5 percent;

propylene glycol methyl ether (i.e. co-solvent PM): 3 percent;

distilled water: 11.6 percent;

wherein the wetting agent consists of DYNOL607 and EFKA3772, and the mass ratio of DYNOL607 to EFKA3772 is 2; the first pigment and the filler are composed of 0.2 mass percent of bentonite, 6 mass percent of zinc phosphate, 4 mass percent of aluminum tripolyphosphate, 4 mass percent of magnesium silicate, 20.9 mass percent of barium sulfate, 2.2 mass percent of titanium dioxide, 1.5 mass percent of carbon black and 1.2 mass percent of iron yellow in the component A, wherein the mass percent of the first pigment and the filler in the component A is 40 percent;

the component B comprises the following raw materials in percentage by mass:

waterborne epoxy curing agent YG-F300:64.3 percent;

propylene glycol methyl ether (i.e. co-solvent PM): 21 percent;

distilled water: 14.7 percent;

wherein the mass ratio of the component A to the component B is 7;

the component C comprises the following raw materials in percentage by mass:

aqueous hydroxyl acrylic dispersion AQUAPAC-8225:50 percent;

dispersant Addigital DX 774:3.0 percent;

wetting agent BD-3033:2.2 percent;

defoaming agent UNIQ FOAM LP2565:1.5 percent;

defoaming agent BYK-028:0.5 percent;

aqueous functional resin YG-HBP075:6 percent;

second pigment and filler: 25 percent;

thickener Addital WS:0.8 percent;

dipropylene glycol butyl ether (i.e. co-solvent DPnB): 6 percent;

distilled water: 5 percent;

wherein, the mass fraction of the first pigment and the filler in the C component is 25 percent, and the first pigment and the filler are composed of 20.1 percent of barium sulfate, 2.2 percent of titanium dioxide, 1.5 percent of carbon black and 1.2 percent of iron yellow in the C component;

the component D comprises the following raw materials in percentage by mass:

isocyanate curing agent X5277.06:80 percent;

propylene glycol diacetate (i.e. co-solvent PGDA): 18 percent;

a dehydrating agent BF-5:2 percent;

wherein the mass ratio of the component C to the component D is 9.

In this embodiment, the preparation method of the aqueous two-component matching paint comprises the following steps:

(1) Preparation of a component A of the water-based bi-component epoxy primer:

s1: under the stirring condition, sequentially adding 15% of waterborne epoxy resin E-pos1025, 11.6% of distilled water, 2% of dispersant COADIS 123K, 0.3% of defoamer AC-202, 0.2% of wetting agent DYNOL607 and 3% of propylene glycol methyl ether (namely cosolvent PM), and stirring and mixing for 5-10min at the rotating speed of 300-400 r/min to obtain a first mixture;

s2, adding 0.2% of bentonite, 6% of zinc phosphate, 4% of aluminum tripolyphosphate, 4% of magnesium silicate, 20.9% of barium sulfate, 2.2% of titanium dioxide, 1.5% of carbon black and 1.2% of iron yellow into the first mixture, stirring at the rotating speed of 800-1000 r/min for 10-15min, transferring to a sand mill, grinding until the particle size is less than 25 mu m, and controlling the temperature of the mixture in the grinding process to be less than 45 ℃ (namely 15-45 ℃) to obtain primer color paste;

s3, uniformly mixing 25 percent of E-pos1025 resin, 0.1 percent of wetting agent EFKA3772, 0.1 percent of defoaming agent AC-202, 1.2 percent of silane crosslinking agent MOAP 1316, 1.0 percent of flash rust inhibitor HOS FRI 1203, 0.5 percent of thickening agent RASE-60 and primer color paste in S2 under the stirring condition of 500-1000r/min to obtain a component A of the water-based epoxy primer;

(2) Preparing a component B of the waterborne bi-component epoxy primer: stirring and mixing 64.3 percent of waterborne epoxy curing agent YG-F300, 21 percent of propylene glycol methyl ether (namely cosolvent PM) and 14.7 percent of distilled water for 5-10min at the rotating speed of 300-400 r/min to obtain a component B;

(3) Preparing a water-based double-component polyurethane finish C component:

s1: under the stirring condition, sequentially adding 20% of aqueous hydroxyl acrylic acid dispersion AQUAPAC-8225, 5% of distilled water, 3.0% of dispersing agent Addigital DX 774, 1.5% of defoaming agent UNIQ FOAM LP2565 and 1.2% of wetting agent BD-3033, and stirring and mixing at the rotating speed of 300-400 r/min for 5-10min to obtain a second mixture;

s2: adding 20.1 percent of barium sulfate, 2.2 percent of titanium dioxide, 1.5 percent of carbon black and 1.2 percent of iron yellow into the second mixture, stirring and mixing at the rotating speed of 800-1000 r/min for 10-15min, then transferring to a sand mill for grinding until the particle size is less than 10 mu m, and controlling the temperature of the mixture in the grinding process to be less than 45 ℃ (namely 15-45 ℃) to obtain finish color paste;

s3: uniformly mixing 30% of waterborne hydroxyl acrylic acid dispersion AQUAPAC-8225, 6% of waterborne functional resin YG-HBP075, the rest 1.0% of wetting agent BD-3033, 0.5% of defoaming agent BYK-028, 6.0% of dipropylene glycol butyl ether (namely cosolvent DPnB), 0.8% of thickening agent Addital WS and finish paint color paste in S2 under the stirring condition of 500-1000r/min to obtain a waterborne polyurethane finish paint component C;

(4) Preparing a water-based double-component polyurethane finish paint component D: stirring and mixing 80% of isocyanate curing agent X5277.06, 18% of cosolvent PGDA and 2% of dehydrating agent BF-5 at the rotating speed of 300-400 r/min for 5-10min to obtain a component D;

(5) Preparation of aqueous two-component matching paint: mixing the component A and the component B according to a mass ratio of 7: critical Pigment Volume Concentration (CPVC) 1.1:1, obtaining the water-based bi-component epoxy primer; and (2) mixing the component C and the component D according to a mass ratio of 9.

Example 2

This example provides a two-component waterborne paint formulation and method of preparation, the components and method of preparation in this example are the same as in example 1, and the only difference from example 1 is that: the waterborne epoxy resin in this example uses PZ 3961 instead of E-pos1025.

Example 3

This example provides a two-component waterborne paint formulation and method of preparation, the components and method of preparation in this example are the same as in example 1, and differ from example 1 only in that: the waterborne epoxy in this example uses 3EE109W instead of E-pos1025.

Example 4

This example provides a two-component waterborne paint formulation and method of preparation, the components and method of preparation in this example are the same as in example 1, and the only difference from example 1 is that: the waterborne epoxy in this example used BC 2060 instead of E-pos1025.

It should be noted that the PVC (pigment volume concentration) is related to the pigment in the formulation, and specifically relates to the amount, density, volume and oil absorption of the pigment used, the pigment and filler of the same type, and the oil absorption of the pigment and filler of different manufacturers, and finally the amount of the PVC and CPVC (critical pigment volume concentration) is controlled by adjusting the type and amount of the pigment and filler to achieve the desired PVC.

Comparative example 1

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 1 are the same as those in the example 1, and the difference from the example 1 is only that: the dosage of barium sulfate in the component A is 16.9 percent, the dosage of distilled water is 15.6 percent, and the ratio of PVC to CPVC is controlled to be 1.0:1.

comparative example 2

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 2 are the same as those in the example 1, and the difference from the example 1 is only that: the dosage of barium sulfate in the component A is 25.9 percent, the dosage of distilled water is 6.6 percent, and the ratio of PVC to CPVC is controlled to be 1.2:1.

comparative example 3

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 3 are the same as those in the example 1, and the difference from the example 1 is only that: the mass ratio of the component A to the component B in the water-based two-component epoxy primer is 6.

Comparative example 4

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 4 are the same as those in the example 1, and the difference from the example 1 is only that: the mass ratio of the component A to the component B in the water-based two-component epoxy primer is 8.

Comparative example 5

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 5 are the same as those in the example 1, and the difference from the example 1 is only that: the preparation method of the component B is different, and specifically comprises the following steps: 43.4 percent of waterborne epoxy curing agent 3EC152W, 21 percent of cosolvent PM and 35.6 percent of distilled water are stirred for 5-10min at the rotating speed of 300-400 r/min to obtain the component B.

Comparative example 6

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 6 are the same as those in the example 1, and the difference from the example 1 is only that: the difference between the component C and the component D is as follows: the component C is prepared by selecting 50 percent of aqueous hydroxyl acrylic acid dispersoid AQUAPAC-8230 to replace 50 percent of aqueous hydroxyl acrylic acid dispersoid AQUAPAC-8225; the amount of the isocyanate curing agent (X5277.06) in the component D is 88 percent.

The hydroxyl group content of resin 8230 was 2.9% (mass%); the hydroxyl value content of resin 8225 was 2.5% (mass%).

Comparative example 7

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 7 are the same as those in the example 1, and the difference from the example 1 is only that: the preparation method of the component D is different, and specifically comprises the following steps: stirring 62% of isocyanate curing agent AQUAPU-360, 36% of cosolvent PGDA and 2% of dehydrating agent at the rotating speed of 300-400 r/min for 5-10min to obtain the component D.

Comparative example 8

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 8 are the same as those in the example 1, and the difference from the example 1 is only that: the preparation method of the component A is different, and specifically comprises the following steps: in the preparation of the A component, 20% of E-pos1025 resin was charged in S1 and 20% of PZ 3961 resin was charged in S3.

Comparative example 9

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 9 are the same as those in the example 1, and the difference from the example 1 is only that: the preparation method of the component B is different, and specifically comprises the following steps: stirring 32 percent of waterborne epoxy curing agent YG-F300, 21.7 percent of waterborne epoxy curing agent 3EC152W, 21 percent of cosolvent PM and 25.3 percent of distilled water for 5-10min at the rotating speed of 300-400 r/min to obtain a component B.

Comparative example 10

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 10 are the same as those in the example 1, and the difference from the example 1 is only that: the differences of the component C are as follows: the amount of the aqueous functional resin YG-HBP075 in the C component was 5.0%.

Comparative example 11

The comparative example provides a water-based two-component matching paint and a preparation method thereof, the content of each component and the preparation steps in the comparative example 11 are the same as those in the example 2, and the difference from the example 2 is as follows: the method of performance testing is different, and comparative example 11 has a longer standing time in the performance testing (see the performance testing section specifically).

Comparative example 11 is set to illustrate that the material of the water-based two-component paint set sprayed with the topcoat was left to stand for a long period of time (time: 7 d), the topcoat was substantially completely reacted, and the water-drop resistance could be enhanced by the film-shielding effect, while the initial water-drop resistance and the water-drop resistance are two different concepts, and the initial water-drop resistance is a good water-drop resistance in a short time after the topcoat was baked, when the topcoat was not completely reacted.

In order to visually recognize the differences between example 1 and comparative examples 1 to 11, the components of the primer and topcoat in example 1 and comparative examples 1 to 11 are shown in tables 1 and 2, respectively.

TABLE 1 important parameters of the primers in example 1 and comparative examples 1 to 11

Note: the first auxiliary agents in table 1 include the dispersing agents, wetting agents, antifoaming agents, thickening agents, flash rust inhibitors and coupling agents in the a component.

TABLE 2 important parameters for the topcoats in example 1 and comparative examples 1 to 11

Note: the second aqueous auxiliary agent in table 2 includes a dispersant, a wetting agent, a defoaming agent, and a thickener in component C.

As can be seen from tables 1 and 2: example 1 differs from comparative examples 1 to 10 mainly in the kind or amount of raw materials in the two-component aqueous kit; example 2 differs from comparative example 11 mainly in the extent of reaction of the aqueous composite coating film, which is achieved by controlling the standing time after baking of the topcoat.

The raw material, manufacturer and product information used in examples 1 to 4 and comparative examples 1 to 11 are shown in table 3 below.

Table 3 raw material, manufacturer and product information used in examples 1 to 4 and comparative examples 1 to 11

As can be seen from Table 3: the raw materials used in examples 1 to 4 and comparative examples 1 to 11 are all commercially available reagents, and have the characteristics of convenience and easy availability, which indicates that the formula and the preparation method in examples 1 to 4 are suitable for industrial production and practical application.

Performance testing

The aqueous two-component epoxy primer and aqueous two-component topcoat prepared in examples 1 to 4 and comparative examples 1 to 11 were used to prepare panels and subjected to performance tests, the results of which are shown in table 4.

The initial drip resistance in table 4 was tested according to the following method, comprising the steps of:

1) The substrate adopts a cold-rolled common low-carbon steel plate in GB 708-65 rolled thin steel plate variety, the size is 150mm multiplied by 70mm multiplied by (0.5-1.2) mm, the surface treatment and the coating of the substrate are carried out according to a spraying method in GB 1727-79 general paint film preparation method, and the substrate sprayed with the primer is obtained;

2) Placing the substrate sprayed with the primer in the step 1) in an environment with the temperature of 25 ℃ and the humidity of 50% for flash drying for 20min, then spraying a matched finish, controlling the finish to flow smoothly at the temperature of 25 ℃ for 10min, baking at the temperature of 40 ℃ for 30min, and then placing at room temperature (20-25 ℃ and the humidity of 30-85%) for 3h to obtain a primer sprayed with the matched primer and the matched finish;

3) And (3) receiving distilled water with the height of 3m from the paint film on the substrate sprayed with the matched primer and finish paint in the step 2), naturally dropping and impacting according to the frequency of one drop per second, sucking the test board by using filter paper after a period of time, immediately checking and recording whether the test board has the phenomena of light loss, color change, bubbling, wrinkling, rusting and the like, and recording the abnormal time, wherein 168h is the longest test time and is recorded as 168h, which shows that the set paint has excellent initial dripping resistance.

The water dripping resistance in table 4 was measured according to the following method, and the difference between the initial water dripping resistance and the water dripping resistance was that the standing time in step 2) was different, specifically including the following steps:

1) The substrate is a cold-rolled common low-carbon steel plate in GB 708-65 rolled sheet variety, the size is 150mm multiplied by 70mm multiplied by (0.5-1.2) mm, the surface treatment and the coating of the substrate are carried out according to the spraying method in GB 1727-79 general paint film preparation method, and the substrate sprayed with the primer is obtained;

2) Placing the substrate sprayed with the primer in the step 1) in an environment with the temperature of 25 ℃ and the humidity of 50% for flash drying for 20min, then spraying a matched finish, controlling the finish to flow smoothly at the temperature of 25 ℃ for 10min, baking at the temperature of 40 ℃ for 30min, and then placing at room temperature (20-25 ℃ and the humidity of 30-85%) for 7h to obtain a primer sprayed with the matched primer and the matched finish;

3) And (3) receiving distilled water with the height of 3m from the paint film on the substrate sprayed with the matched primer and finish paint in the step 2), naturally dropping and impacting according to the frequency of one drop per second, sucking the test board by using filter paper after a period of time, immediately checking and recording whether the test board has the phenomena of light loss, color change, bubbling, wrinkling, rusting and the like, and recording the abnormal time, wherein 168h is the longest test time and is recorded as 168h, which shows that the set paint has excellent dripping resistance.

TABLE 4 results of the Performance test of the aqueous two-component epoxy primer and the aqueous two-component topcoat prepared in examples 1 to 4 and comparative examples 1 to 11

Note: the appearance characteristics in Table 4 were obtained by visual inspection;

the gloss is measured by referring to the test standard GB/T9754-2007, and 60% in the table represents the gloss under the test condition that the gloss is 60 degrees;

the impact performance is measured by referring to the test standard of GB/T1732-1993;

the adhesive force is measured by referring to the test standard GB/T9286-1998, and the grade 0 is superior to the grade I;

the initial water resistance is measured by referring to the test standard of (A method) in GB/T1733-1993;

the 40 ℃ water resistance is measured by referring to the test standard of GB/T5209-1985;

the initial drip resistance is measured by referring to the method provided by the invention;

the neutral salt spray resistance is measured by referring to the test standard GB/T1771-2007.

As can be seen from Table 4:

(1) The paint film in the embodiments 1-4 of the invention is flat and smooth, has no undercut and no miliaria, and can meet the appearance requirement in the wet-on-wet process;

(2) Although the initial water resistance and 40 ℃ water resistance tests in examples 1 to 4, comparative example 5, comparative example 9 and comparative example 10 are both ≧ 240h, the initial drip resistance results in comparative example 5, comparative example 9 and comparative example 10 are poor, which can indicate that the initial drip resistance test in the present invention is different from the conventional initial water resistance or 40 ℃ water resistance test;

(3) Comparing example 2 with comparative example 11, the dripping resistance of comparative example 11 is better than that of example 2, which shows that the initial dripping resistance test in the present invention is different from the conventional dripping test, depending on the better shielding effect and the possibility of passing the dripping resistance test when the paint film reaction is complete under the wet-on-wet process;

(4) The paint film of example 1 exhibited excellent properties in initial dripping resistance, neutral salt spray resistance and impact resistance compared with those of comparative examples 1 to 10, and examples 2 to 4 were inferior in effect, thereby illustrating that examples 1 to 4 are all advantageous for obtaining paint films excellent in mechanical properties for winter construction;

(5) According to the performance test result of the example 1, the comprehensive performance of the aqueous two-component matching paint of the example 1 is obviously superior to that of the comparative examples 1-10, and the matched two-component paint capable of being subjected to the wet-on-wet process for large mechanical equipment provided by the invention is proved to have the advantages of flat and smooth appearance, no undercut, high gloss, good impact resistance and adhesion, and excellent initial water resistance, water resistance at 40 ℃ and salt fog resistance. Meanwhile, the paint film in example 1 has quick drying and excellent initial drip resistance, so that the paint film can be baked at a low temperature (40 ℃ for 30 min) in a short time to obtain a paint film with good quality, and further lays a foundation for the paint film to be placed in an open air environment for a long time and to maintain the integrity of the paint film under the condition that the paint film is exposed to the extreme severe environment of rainwater impact without being dried (surface drying);

(6) A matching paint not suitable for a wet-on-wet process is characterized in that when the matching paint is constructed according to the wet-on-wet process, a primer and a finish paint can be bitten, the paint film is uneven and smooth and has an appearance similar to poor leveling, secondly, the gloss of the matching paint is rapidly reduced compared with the construction process of a normal 2C2B, in the aspect of performance, initial water resistance can be realized by that the paint film bubbles in a short time, 40-degree water bath resistance is slightly better than the initial water resistance due to the fact that the matching paint is in accordance with a test standard, salt mist performance is caused by the reaction of a finish paint curing agent and a primer curing agent, the defect of the paint film is caused, the matching paint is characterized in that light loss and plate surface blistering occur in a short time, the corrosion line is more than 2mm, and even the plate surface is seriously rusted. The performance tests listed in the present invention can reflect to some extent whether a coating is suitable for a wet-on-wet process from appearance to performance testing.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.

Claims

1. A water-based double-component matching paint comprises a water-based double-component primer and a water-based double-component finish paint; the water-based double-component primer consists of a component A and a component B, and the water-based double-component finish paint consists of a component C and a component D, and is characterized in that the component A comprises the following raw materials in percentage by mass: water-based epoxy resin: 35% -45%, first auxiliary agent: 2% -10%, first pigment and filler: 35% -45%, propylene glycol methyl ether: 1% -5%;

the component B comprises the following raw materials in percentage by mass: aqueous epoxy curing agent: 60% -70%, propylene glycol methyl ether: 15% -25%;

the component C comprises the following raw materials in percentage by mass: aqueous hydroxyacrylic acid dispersions: 45% -55%, a second auxiliary agent: 6% -15%, water-based functional resin: 6% -8%, second pigment and filler: 20-30%, dipropylene glycol butyl ether: 3% -9%; the component D comprises the following raw materials in percentage by mass: isocyanate curing agent: 75% -82%, propylene glycol diacetate: 15% -22%, dehydrating agent: 1% -5%;

wherein the mass ratio of the component A to the component B is 6.5-7.5.

2. A two-component, aqueous paint formulation according to claim 1, characterised in that: the component A comprises the following raw materials in percentage by mass: water-based epoxy resin: 38% -42%, first auxiliary agent: 4% -8%, first pigment and filler: 38% -42%, propylene glycol methyl ether: 2% -4%, water: 5% -20%;

the component D comprises the following raw materials in percentage by mass: isocyanate curing agent: 75% -82%, propylene glycol diacetate: 15% -22%, dehydrating agent: 1% -5%; wherein the mass ratio of the component A to the component B is 7.

3. A two-component, aqueous paint set according to claim 1 or 2, characterized in that: the aqueous epoxy resin in the component A is aqueous epoxy emulsion; the solid epoxy equivalent in the waterborne epoxy emulsion is 480 g/mol-560 g/mol; the solid content of the water-based epoxy emulsion is 50-55%.

4. A two-component, aqueous paint set according to claim 1 or 2, characterized in that: the first auxiliary agent in the component A consists of a dispersant COADIS 123K, a wetting agent DYNOL607, a wetting agent EFKA3772, a defoaming agent AC-202, a thickening agent RASE-60, a flash rust inhibitor HOS FRI 1203 and a coupling agent MOAP 1316; the first pigment and the filler in the component A consist of bentonite, zinc phosphate, aluminum tripolyphosphate, magnesium silicate, barium sulfate, titanium dioxide, carbon black and iron yellow.

5. The two-component, aqueous paint set according to claim 4, wherein: the mass ratio of the wetting agent DYNOL607 to the wetting agent EFKA3772 is 1.

6. A two-component, aqueous paint set according to claim 1 or 2, characterized in that: the waterborne epoxy curing agent in the component B is an aliphatic polyamine curing agent with active hydrogen equivalent of 250-350.

7. A two-component, aqueous paint set according to claim 1 or 2, characterized in that: the aqueous hydroxyl acrylic acid dispersoid in the component C is selected from one of YG-AD543, PA-3330, KT-8473, AQUAPAC-8225 and Antkote 2025; the second auxiliary agent in the component C consists of a dispersing agent Addigital DX 774, a wetting agent BD-3033, a defoaming agent UNIQOAM LP2565, a defoaming agent BYK-028 and a thickening agent Addigital WS; the aqueous functional resin in the component C is YG-HBP075.

8. A method of preparing a two-component, aqueous paint set according to any of claims 1 to 7, comprising the steps of:

1) Preparation of the component A: mixing the water-based epoxy resin, the first auxiliary agent, propylene glycol methyl ether, the first pigment and the filler according to the mass fraction of claim 1 or 2 to obtain a component A;

2) Preparation of the component B: mixing the water-based epoxy curing agent and propylene glycol methyl ether according to the mass fraction of claim 1 or 2 to obtain a component B;

3) Preparation of component C: mixing the aqueous hydroxy acrylic dispersion, the second auxiliary agent, the aqueous functional resin, the second pigment and filler, and the dipropylene glycol butyl ether according to the mass fraction of claim 1 or 2 to obtain a C component;

4) Preparation of component D: mixing an isocyanate curing agent, propylene glycol diacetate, a dehydrating agent and dipropylene glycol butyl ether according to the mass fraction of claim 1 or 2 to obtain a component D;

5) Mixing the component A and the component B according to the mass ratio of claim 1 or 2 to obtain a water-based two-component primer, and mixing the component C and the component D according to the mass ratio of claim 1 or 2 to obtain a water-based two-component topcoat.

9. Use of an aqueous two-component paint formulation according to any one of claims 1 to 7 for the production of large equipment paint coatings.

10. Use of an aqueous two-component paint formulation according to any one of claims 1 to 7 for the production of coatings for metallic or alloy materials.