CN117946567A - Anticorrosive primer, preparation method thereof and anticorrosive construction method - Google Patents

Abstract

The application relates to the technical field of anti-corrosion paint, and provides an anti-corrosion primer, which comprises an A component and a B component, wherein the A component comprises the following components in parts by weight: 150 to 200 parts of epoxy resin, 5 to 10 parts of silicon aerogel, 3 to 5 parts of silane coupling agent, 573 to 716 parts of antirust pigment and 9 to 18 parts of other auxiliary agents; the rust-proof pigment comprises zinc powder and glass flakes; the component B comprises 70-100 parts of amine curing agent. The anticorrosive primer provided by the application has the advantages that the formula components are adopted, so that the addition amount of zinc powder in the anticorrosive primer can be reduced, the use amount of raw materials is reduced, the anticorrosive primer has higher anticorrosive performance, the anticorrosive primer is matched with anticorrosive finishing paint for use in anticorrosive construction, the anticorrosive construction process can be reduced, and the cost and the efficiency of the anticorrosive construction are saved.

Description

Anticorrosive primer, preparation method thereof and anticorrosive construction method

Technical Field

The present application belongs to the technical field of anti-corrosion coatings, and in particular relates to an anti-corrosion primer and a preparation method thereof, as well as an anti-corrosion construction method.

Background technique

In modern anti-corrosion projects, the requirements for anti-corrosion are getting higher and higher. We need to pursue high anti-corrosion performance, simple construction process and low amount of anti-corrosion coatings. At present, in the anti-corrosion process under the conditions of C4, C5 and CX in ISO12944, it is usually necessary to use three kinds of paints, namely epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polyurethane topcoat, to match different film thicknesses to achieve the corresponding corrosion conditions. In addition, different construction time intervals need to be controlled for the above different paints and different film thicknesses, which makes the anti-corrosion construction process more complicated and reduces the efficiency of anti-corrosion construction.

Summary of the invention

The purpose of the present application is to provide an anti-corrosion primer and a preparation method thereof, as well as an anti-corrosion construction method, aiming to solve the problem of the large number of construction procedures of existing anti-corrosion coatings.

In order to achieve the above application purpose, the technical solution adopted in this application is as follows:

In a first aspect, the present application provides an anticorrosive primer, comprising component A and component B, wherein component A comprises the following components in the following parts by weight:

150 to 200 parts of epoxy resin;

Silica aerogel 5 to 10 parts;

3 to 5 parts of silane coupling agent;

573 to 716 parts of anti-rust pigment, wherein the anti-rust pigment comprises zinc powder and glass flakes;

Other additives 9 to 18 parts;

The B component includes 70 to 100 parts of an amine curing agent.

In a second aspect, the present application provides a method for preparing an anticorrosive primer, comprising the following steps:

Weigh the raw materials of each component of the anticorrosive primer as described above;

The epoxy resin, the silicon aerogel, the silane coupling agent, the anti-rust pigment and the other additives are mixed to obtain the component A;

The component A and the amine curing agent are mixed to obtain the anti-corrosion primer.

In a third aspect, the present application provides an anti-corrosion construction method, comprising the following steps:

Applying an anti-corrosion primer and an anti-corrosion topcoat on the substrate in sequence;

Among them, the anti-corrosion primer is the anti-corrosion primer provided in the present application and/or the anti-corrosion primer prepared by the preparation method provided in the present application.

The anticorrosive primer provided in the first aspect of the present application comprises component A and component B, wherein component A is mainly made of epoxy resin, and epoxy resin and amine curing agent interact to produce cross-linking reaction to generate film-forming material, thereby improving the adhesion to the substrate, and component A is also equipped with zinc powder, glass flakes, silicon-based silicon dioxide, silane coupling agent and other additives, and the anticorrosive coating formed by coating it on the substrate has both the function of zinc powder as the cathode protection substrate and the shielding function of blocking external corrosive substances from passing through the anticorrosive coating, so that the anticorrosive primer has excellent anticorrosive performance and can form a thicker film. The anticorrosive primer combines the performance of existing epoxy zinc-rich primer and epoxy iron oxide intermediate paint, and the anticorrosive primer only needs to be coated on the substrate in one process and used with anticorrosive topcoat to form long-term anticorrosion for the substrate surface, and the anticorrosion grade can reach the C4 grade or above in ISO12944, which not only simplifies the construction process of the anticorrosive process, but also saves the construction cost of the anticorrosive coating.

The second aspect of the present application provides a method for preparing an anti-corrosion primer, which comprises mixing the raw materials of each component of component A to obtain component A, mixing the raw materials of component B to obtain component B, and then mixing component A with component B when in use to prepare an anti-corrosion primer with excellent anti-corrosion performance. The preparation method is simple, convenient, easy to operate, and is conducive to wide use.

The anti-corrosion construction method provided in the third aspect of the present application, by adopting the anti-corrosion primer provided in the present application, can form a paint film with a relatively large film thickness after one application, and the anti-corrosion primer combines the performance of the existing epoxy zinc-rich primer and the epoxy micaceous iron intermediate paint, and can be used with the existing anti-corrosion topcoat to achieve the anti-corrosion performance requirements of C4 level or above in ISO12944. On the basis of ensuring the anti-corrosion requirements of the substrate, it not only simplifies the construction process of the anti-corrosion process, but also saves the construction cost of the anti-corrosion coating.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is an electron microscope image of spherical zinc powder;

FIG2 is an electron microscope image of flaky zinc powder;

FIG3 is a schematic diagram of the anti-corrosion principle of the anti-corrosion primer provided in an embodiment of the present application using spherical zinc powder;

FIG4 is a schematic diagram of the anti-corrosion principle of the anti-corrosion primer provided in an embodiment of the present application using flaky zinc powder;

FIG5 is a salt spray performance test effect diagram of the epoxy zinc-rich primer of Comparative Example 1 and the epoxy micaceous iron intermediate paint of Comparative Example 2 used in combination on a substrate;

FIG6 is a salt spray performance effect diagram of the anticorrosive primer of Example 1 used on a substrate;

FIG7 is a drawing effect diagram of the epoxy zinc-rich primer of Comparative Example 1 and the epoxy micaceous iron intermediate paint of Comparative Example 2;

FIG8 is a diagram showing the pull-out test effect of the anti-corrosion primer of Example 1.

Among them, the reference numerals in the figure are:

1-paint coating; 10-zinc powder; 2-substrate.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

In this application, the term "and/or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship.

In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, where a, b, c can be single or multiple, respectively.

It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

In the existing anti-corrosion process, in order to achieve the anti-corrosion conditions of C4, C5 and CX in ISO12944, it is usually necessary to use three types of paints, epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and polyurethane topcoat, with different film thicknesses to achieve different corrosive environments. In addition, each paint requires at least two construction processes, that is, the entire anti-corrosion process requires six paint construction processes. Moreover, the construction time interval between the epoxy zinc-rich primer and the epoxy micaceous iron intermediate paint needs to be strictly controlled to ensure that the epoxy zinc-rich primer is not easily damaged by oxidation. Therefore, based on traditional anti-corrosion paints, traditional anti-corrosion processes not only have a large loss of anti-corrosion paints, are not conducive to green environmental protection, and are costly; but it is also difficult to guarantee construction quality and efficiency.

Among them, ISO12944 is the corrosion protection standard for steel structure protective coating systems. The atmospheric corrosiveness is divided into six corrosion levels, from low to high, namely C1, C2, C3, C4, C5 and CX. That is, C1 has the lowest corrosiveness and CX has the highest corrosiveness.

Based on the above-mentioned problems existing in the existing anti-corrosion process, the embodiment of the present application starts with the anti-corrosion primer in the anti-corrosion coating, and improves the anti-corrosion performance and mechanical properties of the anti-corrosion primer to improve the problem that the current anti-corrosion primer needs to be used with a variety of paints and also requires multiple construction processes.

The first aspect of the embodiment of the present application provides an anticorrosive primer, comprising component A and component B, wherein component A comprises the following components in the following parts by weight:

150 to 200 parts of epoxy resin;

Silica aerogel 5 to 10 parts;

3 to 5 parts of silane coupling agent;

573 to 716 parts of anti-rust pigment, including zinc powder and glass flakes;

9 to 18 parts of additives;

Component B includes 70 to 100 parts of an amine curing agent.

The anticorrosive primer provided in the embodiment of the present application includes component A and component B. Component A uses epoxy resin as the main raw material. The epoxy resin and the amine curing agent interact to produce a cross-linking reaction to generate a film-forming substance, thereby improving the adhesion to the substrate. At the same time, component A is equipped with zinc powder, glass flakes, silicon aerogel, silane coupling agent and other additives, and the anticorrosive coating formed by applying it on the substrate has both the function of zinc powder as a cathode protection substrate and the shielding effect of blocking external corrosive substances from passing through the anticorrosive coating, so that the anticorrosive primer has excellent anticorrosive performance and can form a paint film with a relatively large film thickness, which combines the performance of existing epoxy zinc-rich primers and epoxy micaceous iron intermediate paints.

Specifically, by adding silica aerogel to the A component formula, due to its serious surface coordination deficiency, large specific surface area and surface oxygen deficiency, it shows extremely strong activity and is easy to bond with the oxygen of the epoxy ring molecules in the formula system, improving the bond force between molecules. At the same time, a part of the fumed silica particles are still distributed in the gaps of the polymer chain, showing high rippling properties, thereby greatly improving the strength, toughness and ductility of the inorganic materials in the formula. Silica aerogel has the functions of thixotropic agent, anti-precipitation, anti-sagging, improving the suspension and dispersibility of anti-rust pigments and fillers in the epoxy system, improving the scratch resistance of the paint film, and improving the adhesion and flexibility of the paint film.

Silane coupling agent is added to the A component formula. The silane alkoxy group of the silane coupling agent is reactive to inorganic substances, and the organic functional group of the silane coupling agent is reactive or compatible to organic substances. Therefore, the silane coupling agent can be between the inorganic and organic interfaces in the formula system, and can form a bonding layer of organic matrix-silane coupling agent-inorganic matrix. That is, the silane coupling agent can interact with both the hydroxyl group in the inorganic substance and the long molecular chain in the organic polymer, so that the two materials with different properties are coupled together, thereby improving various properties of the biomaterial. The addition of silane coupling agent improves the performance between epoxy resin and carbon steel substrate, that is, it enhances the adhesion between epoxy resin and carbon steel substrate, and at the same time maintains the characteristics of silicon aerogel - as a liquid thixotropic agent, anti-precipitation, anti-sagging, improves the suspension and dispersibility of anti-rust pigments and fillers in epoxy system, improves the scratch resistance of paint film, improves the adhesion and flexibility of paint film, and silicon aerogel exhibits extremely strong activity due to its serious surface coordination deficiency, huge specific surface area and surface oxygen deficiency. It is easy to form a bond with the oxygen of epoxy ring molecules, which improves the bond force between molecules. At the same time, a part of silicon aerogel is still distributed in the gaps of polymer chains, showing high rippling properties, so that the strength, toughness and ductility of inorganic materials added by silicon aerogel are greatly improved. In addition, the addition of silane coupling agent can also improve the surface properties of silicon aerogel and ensure the role of silicon aerogel in the formulation system.

Zinc powder and glass flakes are used as anti-rust pigments. Since the oxidation potential of zinc is more negative than that of iron, when corrosion occurs, zinc powder can be oxidized first to achieve cathodic protection. In addition, when zinc powder is oxidized, it will generate insoluble products, which increase the density of the paint film and slow down the corrosion rate of the steel substrate. Therefore, zinc powder has an excellent effect of preventing metal materials from rusting and corrosion. Glass flakes have a flaky structure, so they have strong crack resistance and can improve the shielding effect of the paint film. Glass flakes and zinc powder can play a superimposed role in improving the anti-corrosion effect of the anti-corrosion primer on the steel substrate.

The anticorrosive primer provided in the embodiment of the present application only needs to be coated on the substrate in one step and then used with an anticorrosive topcoat to form a long-lasting anticorrosion and a large film thickness on the substrate surface, reaching the anticorrosive performance requirements of C4 or above in ISO12944, which not only simplifies the construction process of the anticorrosive project, but also saves the construction cost of the anticorrosive coating. Among them, C4 or above in ISO12944 includes C4, C5 and CX.

In some embodiments, the epoxy resin can be a 75% solid E20 bisphenol A type solid epoxy resin, which can be combined with an amine curing agent or their adducts to form a film-forming substance. The epoxy equivalent of the epoxy resin is 500g/Eq to 550g/Eq, the epoxy value is 0.18eq/100g to 0.20eq/100g, the softening point is 65°C to 75°C, the volatile matter is ≤0.6%, and the hydrolyzed chlorine is ≤1%. The epoxy resin is selected from YPE-011H of Shanghai Yuanbang Chemical Manufacturing Co., Ltd.

In some embodiments, the silicon aerogel may be fumed silica, which is a porous substance, and its composition can be represented by SiO ₂ ·nH ₂ O, wherein nH ₂ O exists in the form of surface hydroxyl groups. Fumed silica can be used in anti-corrosion primers to improve the adhesion and flexibility of the paint film, and can act as a thixotropic agent and thickener in the formulation system, and has anti-precipitation and anti-sagging properties. The silicon aerogel is selected from Degussa fumed silica R972.

In some embodiments, the silane coupling agent can be an aminosilane coupling agent, which can be divided into monoaminosilane coupling agent, bisaminosilane coupling agent, triaminosilane coupling agent, etc. according to the number of amino groups. For example, exemplary examples include: γ-aminopropyl triethoxysilane, γ-aminopropyl trimethoxysilane, N-(β-aminoethyl-γ-aminopropyl) trimethoxysilane, etc., which are bifunctional silanes with active amino groups and hydrolyzable inorganic alkoxysilyl groups. The dual nature of its reaction can organically bond inorganic materials and organic polymers together. The purity of the silane coupling agent is 98%, and the density is 1.03g/ml at 25°C.

In some embodiments, the glass flakes may have a diameter of 60 μm to 80 μm, such as 75 μm, a mesh size of 325 mesh, a thickness of ≤8 μm, a specific gravity of 2.5 g/cm ³ to 3.2 g/cm ³ , and a colorless and transparent appearance. The glass flakes have a moisture content of ≤0.05%, a hardness of ≥58, a chemical composition of SiO ₂ of 67.5%±1.0%, Al ₂ O ₃ of 5.2%±0.6%, and CaO of 9.5%±0.5%. The glass flakes are selected from 325 mesh medium alkali glass flakes from Yangzhou Baoyi Pigment Chemical Co., Ltd.

In some embodiments, the mass ratio of zinc powder to glass flakes is (35-40):(17-23).

By using zinc powder and glass flakes in the above mass ratio, since zinc powder has a higher specific gravity and glass flakes have a lower specific gravity, the zinc powder can be in contact with the substrate to the maximum extent, so that the zinc powder forms a continuous conductive layer on the substrate, achieving better anti-corrosion performance. At the same time, the glass flakes are in the upper position to play a shielding and protective role.

Specifically, the mass ratio of zinc powder to glass flakes includes but is not limited to 35:17, 35:20, 35:23, 38:17, 38:20, 38:23, 40:17, 40:20, 40:23, etc.

In some embodiments, the zinc powder includes flaky zinc powder. As shown in FIG1 (an electron microscope image of spherical zinc powder) and FIG2 (an electron microscope image of flaky zinc powder), compared with spherical zinc powder, flaky zinc powder has a flaky structure and a large surface area. Adding flaky zinc powder to component A can improve various properties of the anticorrosive primer.

Specifically, the advantages of flaky zinc powder include: (1) As shown in Figures 3 and 4, Figure 3 shows the anti-corrosion principle diagram of the anti-corrosion primer using spherical zinc powder, the paint film coating 1 is coated on the substrate 2, the spherical zinc powder 10 is dispersed in the paint film coating 1, the zinc powder 10 is in point-to-point contact, part of the corrosive medium passes through the paint film coating 1 to reach the substrate 2, and the zinc powder 10 acts as a sacrificial anode to generate ZnO to prevent the substrate 2 from being corroded. Figure 4 shows the anti-corrosion principle diagram of the anti-corrosion primer using flaky zinc powder, the paint film coating 1 is coated on the substrate 2, the flaky zinc powder 10 is dispersed in the paint film coating 1, and the zinc powder 10 is in a state of parallel overlap and alternating arrangement. Compared with the point-to-point contact between spherical zinc powders, the resistance of the corrosive medium passing through the paint film coating 1 is increased, and the flaky zinc powder can show higher conductivity, so that the paint film maintains good conductivity, thereby enhancing the anti-corrosion effect of the anti-corrosion primer on the cathode protection of the substrate. (2) Since the flaky zinc powder is stacked in the formulation system, it can reduce the porosity of the paint film and increase the resistance of the corrosive medium to penetrate the paint film, thereby enhancing the protective ability of the paint film. (3) The use of flaky zinc powder instead of traditional spherical zinc powder can reduce the amount of zinc powder added and achieve better anti-corrosion effects with less zinc powder, thereby saving resources, reducing costs, and improving anti-corrosion performance. (4) The use of flaky zinc powder exhibits better anti-settling properties in anti-corrosion primers and is not easy to settle during the preparation and use of anti-corrosion primers, which not only ensures the quality of the anti-corrosion primer, but also reduces the difficulty of preparation and construction of the anti-corrosion primer.

In some embodiments, the bulk density of the flaky zinc powder may be 0.9 g/cm ³ -1.3 g/cm ³ , the particle size may be 20 μm -25 μm, and the zinc content in the flaky zinc powder may be greater than 95%. For example, the flaky zinc powder of the present embodiment is selected from the DM-3 product of Shenzhen Zhongjin Lingnan Technology Co., Ltd.

In some embodiments, the anti-rust pigment further includes carbon nanotubes and barium sulfate.

By adding carbon nanotubes, the conductivity of epoxy resin can be improved and the mechanical properties of anti-corrosion primer can be maintained, and the main base material of anti-corrosion primer can be minimally affected. In addition, the connection of carbon nanotubes can maximize the cathodic protection effect of zinc powder, especially flaky zinc powder.

By adding barium sulfate, the overall volume solid content of the anti-corrosion primer is increased, thereby improving the weather resistance and corrosion resistance of the paint film.

In some embodiments, the anti-rust pigment includes the following components in the following parts by weight:

350 to 400 parts of zinc powder;

Glass flakes 170 to 230 parts;

3 to 6 parts of carbon nanotubes;

50 to 80 parts of barium sulfate.

The zinc powder, glass flakes, carbon nanotubes and barium sulfate in the above ratio are used to form a composite anti-rust pigment. The cathodic protection of zinc powder, the carbon nanotubes to enhance the cathodic protection of zinc powder, and the super shielding effect of the glass flake layer structure make the paint film have excellent anti-corrosion performance, and the anti-corrosion grade in ISO12944 can even reach CX grade. Barium sulfate increases the overall solid content of the anti-corrosion primer, so that the anti-corrosion primer only needs to be applied once to achieve a greater thickness, which can reach 100μm to 120μm, reducing the construction process of the anti-corrosion primer.

In some embodiments, the carbon nanotubes may be single-walled carbon nanotubes. At 25° C., the density of the single-walled carbon nanotubes is 0.97 g/ml, and the grinding fineness is <15 μm. The single-walled carbon nanotubes are selected from the H301 product of Shanghai Hanxun New Materials Co., Ltd.

In some embodiments, other additives include polyamide wax, dispersants, and defoamers.

Specifically, other additives include the following components in parts by weight:

5 to 10 parts of polyamide wax;

3 to 5 parts of dispersant;

1 to 3 parts of defoaming agent.

As a thixotropic additive, polyamide wax is effectively activated by organic solvents to form a strong network structure in the formulation system, so that the anti-corrosion primer has excellent thixotropic properties, anti-sagging properties and anti-settling properties. The polyamide wax is selected from Huaxia HX-8800.

By adding the above amount of dispersant, the surface properties of silica aerogel and anti-rust pigment can be improved, and the wetting and dispersing effect can be achieved.

By adding the above amount of defoamer, bubbles generated during the production, packaging, transportation and construction of the anticorrosive primer can be eliminated to ensure the quality of the anticorrosive primer. The defoamer is a mixture of hydrophobic solids (silicon dioxide) in polyethylene glycol and bubble-breaking polysiloxane (dimethyl silicone oil). The defoamer is selected from the product model BYK-024 produced by BYK Chemical Company.

In some embodiments, the amine curing agent is a cardanol curing agent. The cardanol curing agent is specifically a cashew nut oil modified phenolic amine curing agent. The cashew nut oil modified amine curing agent can reduce the curing temperature of the paint film, not only improve the cohesion of the paint film, increase the wetting performance to the steel substrate, but also increase the crosslinking density and glass transition temperature of the paint film, and greatly enhance the salt spray resistance of the anticorrosive primer while ensuring the mechanical properties of the paint film.

In some embodiments, the mass ratio of component A to component B is (8-12):1.

The anti-corrosion primer provided in the embodiment of the present application, before use, is configured into a mixed slurry with component A and component B in a mass ratio of (8-12):1, and then applied on the substrate, and cross-linked and cured by the amine curing agent of component B and the epoxy resin and other components of component A to form a stable paint film coating. The use of the above-mentioned proportions of component A and component B can ensure that the epoxy functional group in the epoxy resin of component A and the active hydrogen in the amine curing agent of component B fully react. When the mass ratio of component A to component B is 10:1, the cross-linking reaction is more sufficient, and the performance of the formed paint film coating is better. In other embodiments, the mass ratio of component A to component B includes but is not limited to 8:1, 9:1, 11:1, 12:1, etc.

In some embodiments, a diluent is added to component A and component B respectively, and the diluent is used to adjust the viscosity of the formulation of component A and component B and to dilute and dissolve the epoxy resin, amine curing agent, etc., so as to form a uniform and stable anticorrosive primer. During the construction process, the diluent can also be used to increase the volatilization rate of the solvent of the anticorrosive primer, so as to quickly form a firm paint film coating on the substrate. Specifically, the diluent is selected from at least one of isopropyl alcohol and xylene.

A second aspect of the present invention provides a method for preparing an anticorrosive primer, comprising the following steps:

Weigh the raw materials of each component of the anticorrosive primer as described above;

Epoxy resin, silicon aerogel, silane coupling agent, anti-rust pigment and auxiliary agent are mixed to obtain component A.

The component A and the amine curing agent are mixed to obtain an anti-corrosion primer.

The preparation method of the anti-corrosion primer provided in the embodiment of the present application is to prepare the anti-corrosion primer by mixing the raw materials of the components of component A to obtain component A, and mixing the raw materials of component B to obtain component B. When in use, component A and component B are mixed again to obtain the anti-corrosion primer with excellent anti-corrosion performance. The preparation method is simple, convenient, easy to operate, and is conducive to wide use.

In some embodiments, mixing epoxy resin, silicon aerogel, silane coupling agent, anti-rust pigment and additives comprises the following steps: firstly mixing epoxy resin, silicon aerogel, silane coupling agent, zinc powder, glass flakes, carbon nanotubes, polyamide wax, defoamer and dispersant, and then adding zinc powder to mix, to obtain component A. Mixing zinc powder last can reduce the difficulty of mixing component A, and also facilitates ensuring that zinc powder is easy to settle in the formula system.

In some embodiments, the mixing process of epoxy resin, silicon aerogel, silane coupling agent, anti-rust pigment and additives includes the following steps: first, pre-dissolving the epoxy resin in a portion of the diluent to form a transparent liquid, then adding a dispersant, polyamide wax and fumed silica to mix, then adding barium sulfate to mix and disperse, then adding a silane coupling agent and a defoaming agent to mix, and finally adding zinc powder, glass flakes, carbon nanotubes and a diluent to mix and disperse to obtain component A.

A third aspect of the present application provides an anti-corrosion construction method, comprising the following steps:

Anti-corrosion primer and anti-corrosion topcoat are applied sequentially on the substrate.

Among them, the anti-corrosion primer is the anti-corrosion primer provided in the present application and/or the anti-corrosion primer prepared by the preparation method provided in the present application.

In some embodiments, a layer of anticorrosive primer is first applied to the substrate, followed by a layer of anticorrosive topcoat. The film thickness of the paint film formed by the anticorrosive primer can reach 170 microns to 190 microns.

The anti-corrosion construction method provided in the embodiment of the present application, by adopting the anti-corrosion primer provided in the present application, can form a paint film with a relatively large film thickness by one application, and the anti-corrosion primer combines the performance of the existing epoxy zinc-rich primer and the epoxy micaceous iron intermediate paint, and can be used with the existing anti-corrosion topcoat to meet the anti-corrosion performance requirements under the C4, C5 and CX conditions in ISO12944. On the basis of ensuring the anti-corrosion requirements of the substrate, it not only simplifies the construction process of the anti-corrosion process, but also saves the construction cost of the anti-corrosion coating.

The following describes it in conjunction with specific embodiments.

Example 1

An anticorrosive primer consists of a component A and a component B in a mass ratio of 10:1.

Component A consists of 150 parts of E20 epoxy resin (YPE-011H), 5 parts of polyamide wax (HX-8800), 5 parts of fumed silica (R972), 2 parts of defoaming agent (BYK-024), 4 parts of dispersant, 125 parts of diluent (isopropyl alcohol), 65 parts of barium sulfate, 5 parts of silane coupling agent (KH792), 390 parts of zinc powder (flaky zinc powder, model DM-3), 200 parts of glass flakes and 5 parts of single-walled carbon nanotubes.

Component B consists of 100 parts of isopropyl alcohol, 200 parts of xylene and 700 parts of amine curing agent (BS890-70 curing agent).

The anticorrosive primer is prepared by the following preparation steps:

Step 1: Add 95 parts of isopropanol into a dispersion container, slowly add 150 parts of E20 epoxy resin at a speed of 300 rpm to 600 rpm, and disperse at high speed to form a transparent liquid.

Step 2: At a rotation speed of 300 rpm to 600 rpm, add 4 parts of dispersant, 5 parts of polyamide wax and 5 parts of fumed silica to the slurry obtained in step 1 in sequence, and then control the rotation speed to 800 rpm to 1000 rpm for dispersion and stirring.

Step 3: Slowly add 65 parts of barium sulfate to the slurry obtained in step 2 at a rotation speed of 300 rpm to 600 rpm, adjust the rotation speed to 800 rpm to 1000 rpm, and stir and disperse for 15 minutes to form a transparent and uniform state.

Step 4: Add 5 parts of silane coupling agent and 2 parts of defoaming agent to the slurry obtained in step 3, and stir evenly at a speed of 600 rpm to 800 rpm.

Step 5: Add 390 parts of flaky zinc powder, 5 parts of single-walled carbon nanotubes and 200 parts of glass flakes to the slurry obtained in step 4, and disperse them at a speed of 300 rpm to 600 rpm for 10 to 15 minutes to form a uniform particle-free state. Finally, add 30 parts of diluent and adjust the viscosity to 120 KU to 130 KU to obtain component A.

Step 6: Stir 200 parts of xylene, 100 parts of isopropanol and 700 parts of amine curing agent at a rotation speed of 800 rpm to 1000 rpm to obtain component B.

Step 7: Take 100 parts of component A and 10 parts of component B, stir and mix them to obtain an anti-corrosion primer.

Example 2

An anticorrosive primer consists of a component A and a component B in a mass ratio of 10:1.

Component A consists of 200 parts of E20 epoxy resin (YPE-011H), 5 parts of polyamide wax (HX-8800), 10 parts of fumed silica (R972), 3 parts of defoamer (BYK-024), 3 parts of dispersant, 125 parts of diluent (isopropyl alcohol), 50 parts of barium sulfate, 3 parts of silane coupling agent (KH792), 350 parts of zinc powder (flaky zinc powder, model DM-3), 170 parts of glass flakes and 3 parts of single-walled carbon nanotubes.

Component B consists of 100 parts of isopropyl alcohol and 900 parts of amine curing agent (BS890-70 curing agent).

The preparation method of the anticorrosive primer is the same as that in Example 1 and will not be repeated here.

Example 3

An anticorrosive primer, which differs from Example 2 in that an equal amount of zinc powder is used to replace barium sulfate, and an equal amount of glass flakes is used to replace single-walled carbon nanotubes, that is, 400 parts of zinc powder and 173 parts of glass flakes. The rest is the same as Example 2 and will not be repeated here.

Example 4

An anticorrosive primer, which is different from Example 1 in that the zinc powder is spherical zinc powder. The rest is the same as Example 1 and will not be repeated here.

Comparative Example 1

The invention discloses an epoxy zinc-rich primer, which consists of a component A and a component B in a mass ratio of 10:1.

Component A is composed of 90 parts of E20 epoxy resin (YPE-011H), 13 parts of bentonite (10 parts of 184 bentonite and 3 parts of CLAYMINTON 70 organic bentonite), 4 parts of fumed silica (R972), 9 parts of defoamer (BYK-163), 3.5 parts of amino resin (amino resin 582-2), 788 parts of zinc powder (500 mesh spherical zinc powder), 92.5 parts of diluent (xylene) and 10 parts of polyamide wax (HX-8800).

Component B consists of 550 parts of xylene and 450 parts of amine curing agent (BS890-70 epoxy curing agent).

The epoxy zinc-rich primer is prepared by the following preparation steps:

Step 1: Add 42.5 parts of xylene into a dispersion container, slowly add 90 parts of E20 epoxy resin at a rotation speed of 300 rpm to 600 rpm, and disperse at high speed to form a transparent liquid.

Step 2: At a rotation speed of 300 rpm to 600 rpm, add 10 parts of 184 bentonite, 50 parts of xylene, 4 parts of fumed silica, 9 parts of defoaming agent and 3.5 parts of amino resin to the slurry obtained in step 1 in sequence, and then control the rotation speed at 800 rpm to 1000 rpm for dispersion and stirring.

Step 3: Add 788 parts of metal zinc powder to the slurry obtained in step 2 at a rotation speed of 300 rpm to 600 rpm, and stir and disperse at 800 rpm to 1000 rpm for 15 minutes to form a transparent and uniform state.

Step 4: Add 3 parts of organic bentonite and 10 parts of polyamide wax to the slurry obtained in step 3, and stir evenly at 800 rpm to 1000 rpm to obtain component A.

Step 5: Stir 550 parts of xylene and 450 parts of amine curing agent at a rotation speed of 800 rpm to 1000 rpm to obtain component B.

Step 6: Take 100 parts of component A and 10 parts of component B, stir and mix them to obtain epoxy zinc-rich primer.

Comparative Example 2

The invention discloses an epoxy micaceous iron intermediate paint, which consists of a component A and a component B in a mass ratio of 10:1.

Component A is composed of 150 parts of E20 epoxy resin (YPE-011H), 6 parts of polyethylene wax (DEURHEO 202P), 12 parts of bentonite (184 bentonite), 35 parts of titanium dioxide (R-216 titanium dioxide), 0.2 parts of carbon black (ZG-100), 240 parts of talc (particle size 400 mesh), 163 parts of precipitated barium, 200 parts of mica iron oxide powder (MIO), 10 parts of polyamide wax (HX-8800) and 213.8 parts of diluent (xylene).

Component B is composed of 350 parts of xylene, 200 parts of toluene and 450 parts of amine curing agent (Hengst-3016 cashew phenol aldehyde amine (active hydrogen 151)).

The epoxy micaceous iron intermediate paint is prepared by the following preparation steps:

Step 1: Add 50 parts of xylene into a dispersion container, slowly add 150 parts of E20 epoxy resin at a rotation speed of 300 rpm to 600 rpm, and disperse at high speed to form a transparent liquid.

Step 2: At a rotation speed of 300 rpm to 600 rpm, add 12 parts of 184 bentonite, 115 parts of xylene and 6 parts of polyethylene wax to the slurry obtained in step 1 in sequence, and then control the rotation speed to 800 rpm to 1000 rpm for dispersion and stirring.

Step 3: At a rotation speed of 300rpm to 600rpm, add 35 parts of titanium dioxide, 0.2 parts of carbon black, 240 parts of talcum powder, 163 parts of precipitated barium and 200 parts of mica iron oxide powder to the slurry obtained in step 2, and stir and disperse at 800rpm to 1000rpm for 15 minutes to form a transparent and uniform state.

Step 4: Add 10 parts of polyamide wax and 48.8 parts of xylene to the slurry obtained in step 3, and stir evenly at 800 rpm to 1000 rpm to obtain component A.

Step 5: 350 parts of xylene, 200 parts of toluene and 450 parts of amine curing agent are stirred uniformly at a rotation speed of 800 rpm to 1000 rpm to obtain component B.

Step 6: Take 100 parts of component A and 10 parts of component B, stir and mix them to obtain epoxy micaceous iron intermediate paint.

Performance Testing:

Take 1 kg each of the epoxy zinc-rich primer of Comparative Example 1 and the epoxy micaceous iron intermediate paint of Comparative Example 2, make plates according to the ratio, control the film thickness of the epoxy zinc-rich primer to 60 microns to 80 microns, and control the film thickness of the epoxy micaceous iron intermediate paint to 100 microns to 120 microns, that is, the film thickness of the obtained composite coating is controlled between 170 microns and 190 microns. Take 1 kg each of the anticorrosive primers of Examples 1-4, make plates according to the ratio, and control the film thickness of the anticorrosive primer to between 170 microns and 190 microns. The substrate is a sandblasted steel plate of 150mm×70mm×3mm, and 9 plates are made. Adhesion performance and salt spray resistance performance tests are carried out, and the test results are shown in Table 1 below.

Adhesion performance test is carried out in accordance with the method of "ISO4624-2016 Paint film adhesion (pull-off method) test";

The salt spray resistance test is carried out in accordance with the method of ISO9227-2017 Salt Spray Test Standard.

Table 1 Performance test results of Examples 1-4 and Comparative Examples 1-2

It can be seen from the above test results that the anti-corrosion primers of Examples 1-4 of the present application are compared with Comparative Examples 1 and 2, and the anti-corrosion primers prepared in Examples 1-4 can all achieve a film thickness of 180 microns after one spraying, while Comparative Examples 1 and 2 need to be used in a superimposed manner and require two sprayings to achieve a film thickness of 180 microns. The solution of the present application greatly improves the simplification of the construction process.

In terms of salt spray performance, as shown in Figures 7 and 8, Figure 7 is a graph showing the salt spray performance test results of Comparative Examples 1 and 2, showing that the paints of Comparative Examples 1 and 2 were coated on the substrate, and the board surface was bubbling and rusted after 2000 hours. Figure 8 is a graph showing the salt spray performance test results of Example 1, showing that the anticorrosive primer of Example 1 was coated on the substrate, and the board surface remained unchanged after 8000 hours of salt spray. The anticorrosive primer prepared by the present application scheme has been significantly improved in salt spray resistance, and the anticorrosive primer of Example 1 can achieve the effect of no change on the board surface after 8000 hours of salt spray.

In terms of adhesion performance, as shown in Figures 5 and 6, Figure 5 is a graph showing the adhesion performance test results of Comparative Example 1 and Comparative Example 2, showing that the epoxy zinc-rich primer of Comparative Example 1 can withstand a pull-out force of 15.8MPa, and the epoxy micaceous iron intermediate paint of Comparative Example 2 can withstand a pull-out force of 9.5MPa. Figure 6 is a graph showing the adhesion performance test results of Example 1, showing that the anti-corrosion primer of the example can withstand pull-out forces of 11.85MPa and 11.02MPa in two tests, respectively. In the performance requirements of anti-corrosion paint for steel structures, the qualified standard is that the pull-out force is greater than 6MPa. Therefore, the adhesion performance of Comparative Examples 1-2 and Example 1 can meet the performance requirements of steel structures.

In terms of anti-corrosion grade, the anti-corrosion performance of Examples 1-4 can reach the anti-corrosion performance conditions of C4 grade or above in ISO 12944. Among them, Examples 1 and 2 can even reach the highest anti-corrosion grade CX anti-corrosion conditions.

Therefore, the anti-corrosion primer provided in the embodiment of the present application combines the performance of the existing epoxy zinc-rich primer and the epoxy micaceous iron intermediate paint. On the basis of ensuring high anti-corrosion performance, only one coating process is required to achieve a film thickness of 180 microns. There is no need to use a primer and an intermediate paint in combination to achieve a higher film thickness and anti-corrosion performance. It not only enhances the anti-corrosion ability of the steel substrate, but also simplifies the anti-corrosion process and reduces the construction cost of the anti-corrosion process.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The anticorrosive primer is characterized by comprising an A component and a B component, wherein the A component comprises the following components in parts by weight:

150-200 parts of epoxy resin;

5-10 parts of silicon aerogel;

3-5 parts of silane coupling agent;

573-716 parts of antirust pigment, wherein the antirust pigment comprises zinc powder and glass flakes;

9-18 parts of other auxiliary agents;

The component B comprises 70-100 parts of amine curing agent.

2. The corrosion resistant primer according to claim 1, wherein the mass ratio of the zinc powder to the glass flake is (35-40): (17-23).

3. The corrosion resistant primer of claim 1, wherein said zinc powder comprises a scaly zinc powder.

4. The corrosion resistant primer of claim 1, wherein the rust inhibitive pigment further comprises carbon nanotubes and barium sulfate.

5. The corrosion resistant primer according to claim 4, wherein the rust inhibitive pigment comprises the following components in parts by weight:

350-400 parts of zinc powder;

170-230 parts of glass flakes;

3-6 parts of carbon nano tube;

50-80 parts of barium sulfate.

6. The corrosion resistant primer according to claim 1, wherein the weight ratio of the A component to the B component is (8 to 12): 1.

7. The corrosion resistant primer of any one of claims 1-6, wherein the other adjuvants include polyamide wax, dispersant, and defoamer.

8. The corrosion resistant primer according to any one of claims 1to 6, wherein the amine-based curing agent is cardanol curing agent.

9. The preparation method of the anti-corrosion primer is characterized by comprising the following steps of:

Weighing the raw materials of the components of the anti-corrosion primer according to any one of claims 1 to 8;

Mixing the epoxy resin, the silicon aerogel, the silane coupling agent, the antirust pigment and the auxiliary agent to obtain the component A;

And mixing the component A and the amine curing agent to obtain the anti-corrosion primer.

10. The anti-corrosion construction method is characterized by comprising the following steps of:

sequentially coating an anti-corrosion primer and an anti-corrosion finish paint on a substrate;

Wherein the anti-corrosion primer is the anti-corrosion primer according to any one of claims 1 to 8 and/or the anti-corrosion primer prepared by the preparation method according to claim 9.