Waterborne epoxy polyamide coatings, their preparation methods and applications

Abstract

This invention relates to the field of coating technology, and in particular to waterborne epoxy polyamide coatings, their preparation methods, and applications. The waterborne epoxy polyamide coating comprises component A and component B; component A includes waterborne epoxy resin, thickener, defoamer, flash rust remover, pigments and fillers, fumed silica, regulator, and water in a specific ratio; component B includes waterborne epoxy polyamide curing agent, plasticizer, defoamer, regulator, flash rust remover, pigments and fillers, fumed silica, anti-caking agent, thickener, ammonia, isobutanol, and water in a specific ratio; the mass ratio of component A to component B is 0.5–1.5:1. This coating exhibits good corrosion resistance, hardness, extremely strong adhesion, good flexibility, film-forming properties, workability, and leveling properties, and can achieve integrated application of putty and primer.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to waterborne epoxy polyamide coatings, their preparation methods, and applications. Background Technology

[0002] Putty (filler) is a decorative material used to smooth wall surfaces. It is a thick paste-like coating and an essential product before painting. It is applied over primer or directly to the object to remove unevenness and defects on the surface.

[0003] Primer is a coating applied directly to the surface of an object to provide a solid base for the topcoat. It must adhere firmly to the surface to increase the adhesion of the subsequent coatings and enhance the decorative properties of the topcoat.

[0004] Currently, the construction method for concrete is to apply conventional putty first, then spray a sealing primer, and then apply paint, regardless of whether the substrate is flat or smooth. The construction process is complicated, the construction cost is high, and the construction period is also long. Especially on highways, road closures and traffic restrictions are required before construction can begin. The long construction time can lead to serious traffic jams when there is a large volume of traffic.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The primary objective of this invention is to provide a water-based epoxy polyamide coating that can simultaneously possess the properties of both putty and primer, enabling integrated application of putty and primer.

[0007] The second objective of this invention is to provide a method for preparing the waterborne epoxy polyamide coating as described above, which is simple to operate.

[0008] A third object of the present invention is to provide the application of the waterborne epoxy polyamide coatings described above in putty or primer.

[0009] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] This invention provides an aqueous epoxy polyamide coating comprising component A and component B;

[0012] Component A comprises the following components by weight: 16-17 parts of waterborne epoxy resin, 0.35-0.45 parts of thickener, 0.9-1.2 parts of defoamer, 0.45-0.6 parts of flash rust agent, 65.5-71.2 parts of pigments and fillers, 0.9-1.2 parts of fumed silica, 0.4-0.5 parts of regulator, and 10-12 parts of water;

[0013] Component B comprises the following components by weight: 13.5–15.5 parts of waterborne epoxy polyamide curing agent, 0.3–0.4 parts of plasticizer, 0.9–1.2 parts of defoamer, 0.9–1.2 parts of regulator, 0.45–0.6 parts of flash rust agent, 57–61.5 parts of pigments and fillers, 0.9–1.2 parts of fumed silica, 0.8–1.2 parts of anti-caking agent, 0.9–1 part of thickener, 0.8–1.2 parts of ammonia, 0.04–0.06 parts of isobutanol, and 19–21 parts of water;

[0014] The mass ratio of component A to component B is 0.5 to 1.5:1.

[0015] Furthermore, the waterborne epoxy resin includes ARALDITE PZ 756 / 67;

[0016] The waterborne epoxy polyamide curing agent includes ARADUR 435.

[0017] Furthermore, in component A, the thickener includes LAPONITE RD.

[0018] Preferably, the defoamer includes MONTANOX 20.

[0019] Preferably, the flash rust agent comprises AB RUST NFP.

[0020] Preferably, the regulator comprises n-butanol.

[0021] Furthermore, in component A, the pigments and fillers include one or more of titanium dioxide, kaolin, and calcium carbonate.

[0022] Preferably, the pigments and fillers comprise the following components by weight: 2.5 to 3.2 parts titanium dioxide, 5 to 6 parts kaolin, and 58 to 62 parts calcium carbonate.

[0023] Furthermore, in component B, the plasticizer includes cellulose.

[0024] Preferably, the defoamer includes MONTANOX 20.

[0025] Preferably, the regulator comprises hexene glycol.

[0026] Preferably, the flash rust agent comprises AB RUST NFP.

[0027] Preferably, the anti-caking agent includes HYPAX SD 40.

[0028] Preferably, the thickener comprises ACRYSOL ASE-60ER.

[0029] Furthermore, in component B, the pigments and fillers include one or more of iron oxide black, talc, kaolin, and calcium carbonate.

[0030] Preferably, the pigment and filler comprises the following components by weight: 0.1-0.15 parts of iron oxide black, 7-8 parts of talc, 9-10 parts of kaolin, and 41-43 parts of calcium carbonate.

[0031] Furthermore, the film thickness of the waterborne epoxy polyamide coating in a single application is ≤350μm.

[0032] The present invention also provides a method for preparing waterborne epoxy polyamide coatings, wherein the waterborne epoxy polyamide coating is obtained by uniformly mixing the components.

[0033] Furthermore, the preparation method of the waterborne epoxy polyamide coating includes the following steps:

[0034] (a) After mixing waterborne epoxy resin, thickener, defoamer, flash rust agent, pigments and fillers, fumed silica and water, butanol is added to adjust the viscosity to obtain component A;

[0035] (b) Mix waterborne epoxy curing agent, plasticizer, defoamer, flash rust agent, pigments and fillers, fumed silica, anti-caking agent and water, then add thickener, ammonia and isobutanol to adjust the viscosity to obtain component B;

[0036] (c) Mix component A and component B to obtain a waterborne epoxy polyamide coating.

[0037] This invention also provides the application of waterborne epoxy polyamide coatings in putty or primer.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] The waterborne epoxy polyamide coating of the present invention has excellent corrosion resistance, hardness, adhesion, flexibility, film-forming properties, application performance and leveling properties; and can meet the needs of multiple functions.

[0040] The water-based epoxy polyamide coating of this invention is suitable for indoor use as well as for concrete putty leveling layers or primer layers. It can replace putty and primer at the same time, enabling integrated construction of putty and primer in one application. Compared with conventional construction methods, it reduces the number of construction layers and construction costs.

[0041] The waterborne epoxy polyamide coating of the present invention has a high solids content, with a volume solids content of about 75%, no VOC release, no environmental pollution, and meets current environmental protection requirements. Detailed Implementation

[0042] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0043] The following provides a detailed description of the waterborne epoxy polyamide coating, its preparation method, and its application according to embodiments of the present invention.

[0044] In some embodiments of the present invention, an aqueous epoxy polyamide coating is provided, comprising component A and component B;

[0045] Component A comprises the following components by weight: 16-17 parts of waterborne epoxy resin, 0.35-0.45 parts of thickener, 0.9-1.2 parts of defoamer, 0.45-0.6 parts of flash rust agent, 65.5-71.2 parts of pigments and fillers, 0.9-1.2 parts of fumed silica, 0.4-0.5 parts of regulator, and 10-12 parts of water;

[0046] Component B comprises the following components by weight: 13.5–15.5 parts of waterborne epoxy polyamide curing agent, 0.3–0.4 parts of plasticizer, 0.9–1.2 parts of defoamer, 0.9–1.2 parts of regulator, 0.45–0.6 parts of flash rust agent, 57–61.5 parts of pigments and fillers, 0.9–1.2 parts of fumed silica, 0.8–1.2 parts of anti-caking agent, 0.9–1 part of thickener, 0.8–1.2 parts of ammonia, 0.04–0.06 parts of isobutanol, and 19–21 parts of water;

[0047] The mass ratio of component A to component B is 0.5 to 1.5:1.

[0048] The waterborne epoxy polyamide coating of the present invention is prepared by separately preparing waterborne epoxy resin and waterborne epoxy polyamide curing agent into a coating system containing solid pigments and fillers, thereby enabling the prepared waterborne epoxy polyamide coating to meet the needs of multiple functions.

[0049] The waterborne epoxy polyamide coating of the present invention is suitable for use in indoor applications as well as in concrete putty leveling layers or primer layers. It can replace traditional putty and primer at the same time and has the characteristics of good corrosion resistance, high hardness, strong adhesion, good flexibility, good film-forming properties, excellent workability and leveling properties.

[0050] The water-based epoxy polyamide coating of this invention enables integrated application of putty and primer. For smooth, flat surfaces, it can be directly applied by roller. For surfaces with pits, pores, cracks, or other defects, the surface should be smoothed with a putty knife before roller application to achieve a well-leveled surface. After drying, it also provides excellent corrosion resistance. Compared to the traditional process of first applying regular putty and then spraying a sealing primer, the construction process is simpler, reducing the number of coats and applications, eliminating the need for primer, and lowering construction costs and time.

[0051] In some specific embodiments of the present invention, the mass ratio of component A to component B is 0.8 to 1.2:1; preferably, the mass ratio of component A to component B is 1:1.

[0052] In some embodiments of the present invention, the waterborne epoxy resin includes ARALDITE PZ 756 / 67.

[0053] In some embodiments of the present invention, the waterborne epoxy polyamide curing agent includes ARADUR 435.

[0054] In the waterborne epoxy polyamide coating of the present invention, a high-performance waterborne epoxy polyamide coating can be obtained by mixing and matching the waterborne resin ARALDITE PZ756 / 67 from Huntsman GmbH, Germany, with the waterborne epoxy polyamide curing agent ARADUR 435.

[0055] In some embodiments of the present invention, the thickener in component A includes LAPONITE RD.

[0056] In some embodiments of the present invention, component A includes MONTANOX 20 as an antifoaming agent.

[0057] In some embodiments of the present invention, component A includes AB RUST NFP as the flash rust agent.

[0058] In some embodiments of the present invention, the modifier in component A includes n-butanol.

[0059] In some embodiments of the present invention, component A contains pigments and fillers including one or more of titanium dioxide, kaolin, and calcium carbonate.

[0060] In some embodiments of the present invention, component A comprises the following components by weight: 2.5 to 3.2 parts titanium dioxide, 5 to 6 parts kaolin, and 58 to 62 parts calcium carbonate.

[0061] In some embodiments of the present invention, component B contains cellulose as a plasticizer, preferably NATROSOL 250HR.

[0062] In some embodiments of the present invention, component B includes MONTANOX 20 as an antifoaming agent.

[0063] In some embodiments of the present invention, the modifier in component B includes hexene glycol.

[0064] In some embodiments of the present invention, component B includes AB RUST NFP as the flash rust agent.

[0065] In some embodiments of the present invention, component B includes HYPAX SD 40 as an anti-caking agent.

[0066] In some embodiments of the present invention, component B includes ACRYSOL ASE-60ER as a thickener.

[0067] In some embodiments of the present invention, component B contains pigments and fillers including one or more of iron oxide black, talc, kaolin, and calcium carbonate.

[0068] In some embodiments of the present invention, component B comprises the following components by weight: 0.1 to 0.15 parts of iron oxide black, 7 to 8 parts of talc, 9 to 10 parts of kaolin, and 41 to 43 parts of calcium carbonate.

[0069] In some embodiments of the present invention, the concentration of ammonia in component B is 15 wt% to 25 wt%.

[0070] In some embodiments of the present invention, fumed silica comprises HDK N2O.

[0071] In the waterborne epoxy polyamide coating system of this invention, the selection of additives is quite sensitive, and the type and amount of additives affect the performance of the coating. Additives must be compatible with water and also need to maintain long-term stability in aqueous solutions. Appropriate additives are selected for components A and B respectively to achieve excellent coating performance.

[0072] In the waterborne epoxy polyamide coating system of the present invention, cellulose is used as a thickening agent and plasticizer. Cellulose is prone to mold growth during storage. Preventing mold and deterioration is an important aspect of waterborne coatings during production and storage. Adding an appropriate amount of ammonia water to adjust the pH can prevent mold growth.

[0073] When water-based epoxy polyamide coatings come into contact with steel or metal substrates, the presence of moisture can cause corrosion. Adding a flash rust agent, AB RUST NFP, can improve the occurrence of flash rust, enhance adhesion to the substrate, and improve the anti-corrosion effect.

[0074] In the waterborne epoxy polyamide coating system of the present invention, titanium dioxide, kaolin and calcium carbonate are selected as pigments and fillers in component A, which can obtain good workability, leveling, corrosion resistance and water resistance; iron oxide black, talc, kaolin and calcium carbonate are selected as pigments and fillers in component B, which can meet the requirements of thick film one-time construction and have good anti-corrosion effect.

[0075] In some embodiments of the present invention, the film thickness of the waterborne epoxy polyamide coating in a single application is ≤350μm.

[0076] The waterborne epoxy polyamide coating of the present invention is a solvent-free waterborne high-solids polyamide coating with a volume solids content of about 75%, no VOC release, no environmental pollution, and meets current environmental protection requirements.

[0077] The waterborne epoxy polyamide coating of the present invention is an integrated putty and primer material. Under special construction conditions, it can replace both putty and primer at the same time, achieving one-time construction and forming.

[0078] The waterborne epoxy polyamide coating of this invention can be used for the base coating of highway concrete guardrails, urban overpasses, and concrete structures in general industrial plants. While having excellent anti-corrosion capabilities, it also greatly improves environmental protection and workability, making concrete protection construction simpler and more convenient, and effectively protecting the service life of concrete structures.

[0079] In some embodiments of the present invention, a method for preparing a waterborne epoxy polyamide coating is also provided, wherein the waterborne epoxy polyamide coating is obtained by uniformly mixing the components.

[0080] In some embodiments of the present invention, the preparation method of the waterborne epoxy polyamide coating includes the following steps:

[0081] (a) After mixing waterborne epoxy resin, thickener, defoamer, flash rust agent, pigments and fillers, fumed silica and water, butanol is added to adjust the viscosity to obtain component A;

[0082] (b) Mix waterborne epoxy curing agent, plasticizer, defoamer, flash rust agent, pigments and fillers, fumed silica, anti-caking agent and water, then add thickener, ammonia and isobutanol to adjust the viscosity to obtain component B;

[0083] (c) Mix component A and component B to obtain a waterborne epoxy polyamide coating.

[0084] In some embodiments of the present invention, the application of waterborne epoxy polyamide coatings in putty or primer is also provided.

[0085] Example 1

[0086] The waterborne epoxy polyamide coating provided in this embodiment includes component A and component B in a mass ratio of 1:1;

[0087] Component A comprises the following components by weight: 16 parts of waterborne epoxy resin (ARALDITE PZ 756 / 67), 0.35 parts of thickener (LAPONITE RD), 0.9 parts of defoamer (MONTANOX 20), 0.45 parts of flash rust agent (AB RUST NFP), 2.5 parts of titanium dioxide (TIOXIDE TR92), 5 parts of kaolin (POLWHITE B), 58 parts of calcium carbonate (DURCAL 40), 0.9 parts of fumed silica (HDK N20), 0.4 parts of n-butanol, and 10 parts of water;

[0088] Component B comprises the following components by weight: 13.5 parts of waterborne epoxy polyamide curing agent (ARADUR 435), 0.3 parts of plasticizer (NATROSOL 250HR), 0.9 parts of defoamer (MONTANOX 20), 0.9 parts of hexene glycol, 0.45 parts of flash rust agent (AB RUST NFP), 0.1 parts of iron oxide black (BAYFERROX 318M), 7 parts of talc (LUZENAC 10M0), 9 parts of kaolin (POLWHITE B), 41 parts of calcium carbonate (DURCAL 40), 0.9 parts of fumed silica (HDK N2O), 0.8 parts of anti-caking agent (HYPAX SD 40), and 0.8 parts of thickener (ACRYSOL). 0.9 parts of ASE-60ER, 0.8 parts of ammonia (AMMONIA 20% TECHNICAL), 0.04 parts of isobutanol, and 19 parts of water.

[0089] The method for preparing the waterborne epoxy polyamide coating provided in this embodiment includes the following steps:

[0090] (a) Weigh out the water-based epoxy resin according to the weight proportions, add water, and stir at low speed (500 rpm) for 5 min; add thickener while stirring, and after the addition is complete, increase the speed to 1000 rpm for high-speed dispersion for 15 min. After dispersion into a gel, gradually add defoamer and flash rust agent, and disperse at high speed for 5 min. After observing to ensure that the added raw materials are evenly dispersed, add titanium dioxide, kaolin and calcium carbonate (calcium carbonate is half of the total amount), stir evenly, add fumed silica, and then add the remaining calcium carbonate to the reactor. After the addition is complete, clean the tank wall, cover the feeding port, and stir at high speed (1200 rpm) for 30 min. Then reduce the speed to 600 rpm and add an appropriate amount of n-butanol to adjust the viscosity to obtain component A.

[0091] (b) Weigh the water-based epoxy polyamide curing agent according to the weight proportions, add an appropriate amount of water, and stir at low speed (500 rpm) for 5 minutes; add cellulose while stirring, and after the addition is complete, increase the speed to 1000 rpm for high-speed dispersion for 15 minutes. After dispersion into a gel, gradually add defoamer, flash rust agent and hexene glycol, and disperse at high speed for 5 minutes; after ensuring that the added raw materials are evenly dispersed, add iron oxide black, talc, kaolin and calcium carbonate (calcium carbonate is half of the total amount), stir evenly, add fumed silica, and then add the remaining calcium carbonate to the reactor. After the addition is complete, clean the tank wall with an appropriate amount of water, cover the feeding port, and stir at high speed (1200 rpm) for 30 minutes. Then reduce the speed to 600 rpm, add an appropriate amount of anti-caking agent and stir evenly. Then add thickener, ammonia and isobutanol to adjust the viscosity to obtain component B;

[0092] (c) Mix components A and B in the specified proportions to obtain a water-based epoxy polyamide coating.

[0093] Example 2

[0094] The waterborne epoxy polyamide coating provided in this embodiment includes component A and component B in a mass ratio of 1:1;

[0095] Component A comprises the following components by weight: 17 parts of waterborne epoxy resin (ARALDITE PZ 756 / 67), 0.45 parts of thickener (LAPONITE RD), 1.2 parts of defoamer (MONTANOX 20), 0.6 parts of flash rust agent (AB RUST NFP), 3.2 parts of titanium dioxide (TIOXIDE TR92), 6 parts of kaolin (POLWHITE B), 62 parts of calcium carbonate (DURCAL 40), 1.2 parts of fumed silica (HDK N20), 0.5 parts of n-butanol, and 12 parts of water;

[0096] Component B comprises the following components by weight: 15.5 parts of waterborne epoxy polyamide curing agent (ARADUR 435), 0.4 parts of plasticizer (NATROSOL 250HR), 1.2 parts of defoamer (MONTANOX 20), 1.2 parts of hexene glycol, 0.6 parts of flash rust agent (AB RUST NFP), 0.15 parts of iron oxide black (BAYFERROX 318M), 8 parts of talc (LUZENAC 10M0), 10 parts of kaolin (POLWHITE B), 43 parts of calcium carbonate (DURCAL 40), 1.2 parts of fumed silica (HDK N20), 1.2 parts of anti-caking agent (HYPAX SD 40), 1.0 part of thickener (ACRYSOL ASE-60ER), and 1 part of ammonia (AMMONIA). 1.2 parts of 20% technical, 0.06 parts of isobutanol and 21 parts of water.

[0097] The preparation method of the waterborne epoxy polyamide coating provided in this embodiment is the same as that in Example 1.

[0098] Comparative Example 1

[0099] The waterborne epoxy polyamide coating provided in this comparative example is similar to Example 1, except that the waterborne epoxy resin is ARALDITE PZ3961-1 and the waterborne epoxy polyamide curing agent is ARADUR S340.

[0100] Comparative Example 2

[0101] The waterborne epoxy polyamide coating provided in this comparative example is similar to Example 1, except that the thickener LAPONITE RD is replaced with TEGO VISCOPLUS 3030, the defoamer MONTANOX 20 is replaced with DOWSIL AFE-2017, and the flash rust agent AB RUST NFP is replaced with HY-71.

[0102] Comparative Example 3

[0103] The waterborne epoxy polyamide coating provided in this comparative example is similar to Example 1, except that in component A: 20 parts of waterborne epoxy resin (ARALDITE PZ 756 / 67), 0.25 parts of thickener (LAPONITE RD), 0.8 parts of defoamer (MONTANOX20), 0.65 parts of flash rust agent (AB RUST NFP), 52 parts of calcium carbonate (DURCAL 40), and 12 parts of water, while the amounts of other components remain unchanged.

[0104] Component B contains: 17.5 parts of waterborne epoxy polyamide curing agent (ARADUR 435), 0.8 parts of defoamer (MONTANOX 20), 0.65 parts of flash rust agent (AB RUST NFP), 0.8 parts of thickener (ACRYSOL ASE-60ER), 43 parts of calcium carbonate (DURCAL 40), and 17 parts of water. The amounts of other components remain unchanged.

[0105] Experimental Example 1

[0106] The performance of the waterborne epoxy polyamide coatings of Examples 1-2 and Comparative Examples 1-3 was tested, and the results are shown in Table 1.

[0107] Table 1

[0108]

[0109]

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aqueous epoxy polyamide coating, characterized in that, comprising component A and component B; the component A comprises the following components by weight fraction: water-based epoxy resin 16-17 parts, thickening agent 0.35-0.45 parts, defoaming agent 0.9-1.2 parts, flash rust inhibitor 0.45-0.6 parts, pigment and filler 65.5-71.2 parts, fumed silica 0.9-1.2 parts, regulator 0.4-0.5 parts and water 10-12 parts; the component B comprises the following components by weight fraction: water-based epoxy polyamide curing agent 13.5-15.5 parts, plasticizer 0.3-0.4 parts, defoaming agent 0.9-1.2 parts, regulator 0.9-1.2 parts, flash rust inhibitor 0.45-0.6 parts, pigment and filler 57-61.5 parts, fumed silica 0.9-1.2 parts, anti-caking aid 0.8-1.2 parts, thickening agent 0.9-1 parts, ammonia 0.8-1.2 parts, isobutyl alcohol 0.04-0.06 parts and water 19-21 parts; the mass ratio of the component A to the component B is 0.5-1.5:1; the water-based epoxy polyamide coating can realize putty primer integrated construction, one-time construction forming, and can simultaneously replace putty and primer; the water-based epoxy resin is ARALDITE PZ 756 / 67; the water-based epoxy polyamide curing agent is ARADUR 435; in the component A, the thickening agent is LAPONITE RD, the defoaming agent is MONTANOX 20, the flash rust inhibitor is AB RUST NFP, and the regulator is n-butanol; in the component B, the plasticizer is cellulose, the defoaming agent is MONTANOX 20, the regulator is hexylene glycol, the flash rust inhibitor is AB RUST NFP, the anti-caking aid is HYPAX SD 40, and the thickening agent is ACRYSOLASE-60ER.

2. The aqueous epoxy polyamide coating according to claim 1, characterized in that, in the component A, the pigment and filler comprises one or more of titanium dioxide, kaolin and calcium carbonate.

3. The aqueous epoxy polyamide coating according to claim 2, characterized in that, the pigment and filler comprises the following components by weight fraction: titanium dioxide 2.5-3.2 parts, kaolin 5-6 parts and calcium carbonate 58-62 parts.

4. The aqueous epoxy polyamide coating of claim 1, wherein, in the component B, the pigment and filler comprises one or more of black iron oxide, talc, kaolin and calcium carbonate.

5. The aqueous epoxy polyamide coating according to claim 4, characterized in that, the pigment and filler comprises the following components by weight fraction: black iron oxide 0.1-0.15 parts, talc 7-8 parts, kaolin 9-10 parts and calcium carbonate 41-43 parts.

6. The aqueous epoxy polyamide coating of claim 1, wherein, the one-time film forming thickness of the water-based epoxy polyamide coating is ≤350 μm.

7. The process for the preparation of waterborne epoxy polyamide coatings according to any one of claims 1 to 6, characterized in that, after the components are uniformly mixed, a water-based epoxy polyamide coating is obtained.

8. The method of preparing a waterborne epoxy polyamide coating according to claim 7, characterized in that, comprising the following steps: (a) uniformly mixing water-based epoxy resin, thickening agent, defoaming agent, flash rust inhibitor, pigment and filler, fumed silica and water, then adding butanol to adjust the viscosity to obtain component A; (b) uniformly mixing water-based epoxy curing agent, plasticizer, defoaming agent, flash rust inhibitor, pigment and filler, fumed silica, anti-caking aid and water, then adding thickening agent, ammonia and isobutyl alcohol to adjust the viscosity to obtain component B; (c) uniformly mixing the component A and component B to obtain a water-based epoxy polyamide coating.

9. Use of the aqueous epoxy polyamide coating according to any one of claims 1 to 6 for the integrated application of putty primer.

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