A water-based graphene rust-preventive anticorrosion primer and a preparation method thereof

Abstract

The application discloses a water-based graphene rust-preventing anticorrosion primer and a preparation method thereof, and belongs to the technical field of paints. The paint is prepared by mixing component A and component B at a mass ratio of 1:1-1:3. The paint uses water as a dispersion medium, is non-combustible and non-explosive, is environmentally friendly and safe, and is convenient to operate, and thus overcomes the shortcomings of oil-based primers. Meanwhile, the rust layer conversion technology is used, so that the process and materials are saved. In addition, the application of the nano material graphene enables the coating to have outstanding anticorrosion effect and mechanical properties.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and particularly relates to a water-based graphene rust-resistant anti-corrosion primer and its preparation method. Background Technology

[0002] Currently, my country suffers enormous direct economic losses annually due to metal corrosion, amounting to approximately 2 trillion RMB, or about 5% of the annual GDP. It also causes personal injury, environmental pollution, and resource waste. One of the most common and effective methods for reducing this corrosion is to apply an anti-corrosion coating to the surface of the metal substrate.

[0003] However, for steel that is often rusted, rust removal is the most important part of the entire coating process. However, due to the high cost of rust removal and the fact that some steel structures are difficult to remove rust due to space and conditions, applying the rust-covered primer to the steel is a practical solution.

[0004] Traditional rust-resistant primers are mostly oil-based, which can pollute the environment. Later, rust-resistant primers using phosphoric acid as a rust converter were water-based, but hydrogen gas was often washed out during the conversion process, making the resulting coating porous and reducing adhesion. Improved rust-resistant primers made with only a complex conversion agent of strontium chrome yellow and phosphate have improved adhesion, but they have poor storage stability. Summary of the Invention

[0005] The purpose of this invention is to provide a water-based graphene rust-resistant anti-corrosion primer and its preparation method in order to solve the above-mentioned problems.

[0006] On the one hand, in order to achieve the above objectives, the present invention adopts the following technical solution: a water-based graphene rust-resistant anti-corrosion primer, which is composed of component A and component B, wherein component A is a resin component, component B is a curing agent component, and the mass ratio of component A to component B is 1:1 to 1:3. Component A is composed of the following raw materials in parts by weight: 40-50 parts epoxy resin, 4-15 parts reactive diluent, 10-20 parts aluminum tripolyphosphate, 10-20 parts zinc phosphate and 15-30 parts barium sulfate. Component B is composed of the following raw materials in parts by mass: 20-200 parts water, 1-3 parts additives, 3-8 parts graphene, 0.5-1.5 parts AF-30, 3-8 parts zinc phosphate, 1-3 parts sodium pyrophosphate, 1-5 parts strontium chrome yellow, 1-5 parts zinc chrome yellow, and 100-250 parts epoxy curing agent stock solution.

[0007] As a further description of the above technical solution: The epoxy resin is at least one of the grades E51 (128#) and E44 (6101#).

[0008] As a further description of the above technical solution: The graphene component is an aqueous solution or dry powder of graphene, wherein the solid content of the added component accounts for 1% to 2% of the total solid content of the coating.

[0009] As a further description of the above technical solution: The additives are defoamers, dispersants, and wetting agents, and the additives correspond to any one or more of the grades 2105#, 154#, 5027#, and BYK190#. The reactive diluent is at least one of the grades AGE and XY622#.

[0010] As a further description of the above technical solution: The epoxy curing agent stock solution is a binary or multi-component aliphatic amine or aromatic amine; the epoxy curing agent stock solution is any one or more of grades 228B, 3870#, and 3876#.

[0011] As a further description of the above technical solution: The water is any one or more of municipal tap water, distilled water, and deionized water.

[0012] As a further description of the above technical solution: The rust-converting agent used in the primer is composed of zinc chromate yellow, strontium chromate yellow, and sodium pyrophosphate.

[0013] On the other hand, in order to achieve the above objectives, the present invention employs the following method: a method for preparing a water-based graphene rust-resistant anti-corrosion primer, comprising the following steps: 1) Prepare the raw materials; 2) Add epoxy resin and reactive diluent to the dispersion vessel and disperse at 500 rpm for 5 min; 3) Slowly add zinc phosphate, aluminum tripolyphosphate and barium sulfate to the reactor. After that, increase the speed of the dispersion plate to 1500-2000 rpm and disperse for 20-40 minutes. 4) When the kettle temperature is ≥50℃, the dispersion stage ends and the mixture is transferred to a grinding mill for fine grinding. When the fineness is ≤25μm, the grinding stage ends. After filtration, the mixture is packaged, and the production of component A is complete. 5) Add the dispersion medium (water) and additives to the dispersion vessel and stir at low speed to dissolve the additives evenly; 6) Add the remaining solid pigments and fillers, disperse at high speed of 1500-2000 rpm for 20-35 min, and then grind in a mill; 7) When the fineness is ≤25μm, pour it into the mixing tank, add a certain amount of wetting agent first, then add epoxy curing agent stock solution, stir at low speed for 5 minutes, filter and package, and the synthesis of component B is now complete.

[0014] As a further description of the above technical solution: The pigments and fillers are any one or more of graphene, zinc phosphate, aluminum tripolyphosphate, precipitated barium sulfate, nano-silica, flakes, and graphite powder.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, component A is bisphenol A type epoxy resin, which is versatile, from the E series, widely available and economical, and has stable performance. It, together with the curing agent component of component B, constitutes a complete anti-corrosion system, and the overall anti-corrosion performance and physical and mechanical properties of the coating are greatly improved.

[0016] 2. In this invention, phosphates such as zinc phosphate can passivate the steel substrate, forming a dense and firm passivation film that protects the substrate and enhances the adhesion to the coating. The slow hydrolysis of the composite phosphate produces coordinated phosphate anions that form insoluble complex polyacid complexes with the active rust, stabilizing the rust layer and becoming a component of the primer. Under the reaction of ligands in phosphates, chromates, resins, and curing agents with the rust, the rust is transformed into a harmless polymeric complex with a certain protective effect, making the rust conversion layer and the upper resin layer form an organic whole, increasing the cohesive force.

[0017] 3. In this invention, the thinnest two-dimensional structure of graphene and the aromaticity of fused rings form a shield and maze effect, which greatly prolongs the penetration time of the chemical medium and ensures that the interlayer adhesion and cohesion between the primer and the rusty iron substrate are ≥15MPa and the salt spray resistance is ≥2000h. Attached Figure Description

[0018] Figure 1 This is a flowchart of a method for preparing a water-based graphene rust-resistant and corrosion-resistant primer. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0020] A water-based graphene rust-resistant and corrosion-resistant primer is composed of component A and component B, wherein component A is a resin component and component B is a curing agent component, and the mass ratio of component A to component B is 1:1 to 1:3. Component A is composed of the following raw materials in parts by weight: 40-50 parts epoxy resin, 4-15 parts reactive diluent, 10-20 parts aluminum tripolyphosphate, 10-20 parts zinc phosphate and 15-30 parts barium sulfate. Component B is composed of the following raw materials in parts by mass: 20-200 parts water, 1-3 parts additives, 3-8 parts graphene, 0.5-1.5 parts AF-30, 3-8 parts zinc phosphate, 1-3 parts sodium pyrophosphate, 1-5 parts strontium chrome yellow, 1-5 parts zinc chrome yellow, and 100-250 parts epoxy curing agent stock solution; The epoxy resin is at least one of the grades E51 (128#) and E44 (6101#); The graphene component is an aqueous solution or dry powder of graphene, wherein the solid content of the added component accounts for 1% to 2% of the total solid content of the coating; The additives are defoamers, dispersants, and wetting agents, and the additives correspond to any one or more of the grades 2105#, 154#, 5027#, and BYK190#. The reactive diluent is at least one of the grades AGE and XY622#. The epoxy curing agent stock solution is a binary or multi-component aliphatic amine or aromatic amine; the epoxy curing agent stock solution is any one or more of grades 228B, 3870#, and 3876#. The water is any one or more of municipal tap water, distilled water, and deionized water; The rust-converting agent used in the primer is composed of zinc chromate yellow, strontium chromate yellow, and sodium pyrophosphate. It utilizes a composite system of strontium chromate yellow, zinc chromate yellow, and phosphate, making the product non-flammable, non-explosive, easy to use, safe and environmentally friendly, and with good storage stability.

[0021] Example 1: S01: Prepare the raw materials as shown in the table below.

[0022] S02: First, add the epoxy resin E51 and reactive diluent AGE to the dispersion vessel and disperse at 500 rpm for 5 min to make them miscible; S03: Then gradually and slowly add the remaining solid powder. After wetting, increase the dispersion speed and disperse at 2000 rpm for 20 minutes. S04: When the material temperature rises to ≥50℃, transfer it to a vertical grinding mill and grind for 40 minutes. Measure the fineness after grinding. When the fineness reaches ≤25μm, filter and fill the product. The production of component A is then complete. S05: Add the prepared dispersion medium (water), dispersant, and defoamer to the stirred dispersion vessel and stir slightly to dissolve them; S06: Then slowly add the solid powders from item 4 to item 9 in sequence, and stir at low speed for 10 minutes. Adjust the speed of the disperser to 2000 rpm and disperse for 20 minutes. Then transfer the dispersed material into the horizontal sand mill. S07: When the fineness is ≤25μm, the grinding is stopped. Add a certain amount of wetting agent and curing agent stock solution to the ground material, stir at low speed of 30rpm for 5 minutes, and the synthesis is completed. Filter and fill the package. The synthesis of component B is now complete.

[0023] Coating: When coating, mix A:B:water in a ratio of 1:1.2:0.2~0.5 and then apply it to the substrate after removing loose rust, oxide layers, oil stains, and dust by spraying, brushing, rolling, or other methods.

[0024] Example 2: S01: Prepare the raw materials as shown in the table below.

[0025] S02: First, add the epoxy resin E44 (6101#) and reactive diluent XY622 to the dispersion vessel and disperse at 500 rpm for 5 min to make them miscible; S03: Then gradually and slowly add the remaining solid powder. After wetting, increase the dispersion speed and disperse at 1500 rpm for 40 minutes. S04: When the material temperature rises to ≥50℃, transfer it to a vertical grinding mill and grind for 40 minutes. Measure the fineness after grinding. When the fineness reaches ≤25μm, filter and fill the product. The production of component A is then complete. S05: Add the prepared dispersion medium (water), dispersant, and defoamer to the stirred dispersion vessel and stir slightly to dissolve them; S06: Then slowly add the solid powders from item 4 to item 9 in sequence, and stir at low speed for 10 minutes. Adjust the speed of the disperser to 1500 rpm and disperse for 35 minutes. Then transfer the dispersed material into the horizontal sand mill. S07: When the fineness is ≤25μm, the grinding is stopped. Add a certain amount of wetting agent and curing agent stock solution to the ground material, stir at low speed of 60rpm for 5 minutes, and the synthesis is completed. Filter and fill the package. The synthesis of component B is now complete.

[0026] Coating: When coating, mix A:B:water in a ratio of 1:1.5:0.1~0.3 and then apply it to the substrate after removing loose rust, oxide layers, oil stains, and dust by spraying, brushing, rolling, or other methods.

[0027] Performance testing: The table below shows the performance of the rust-coated layers after complete curing in actual production for Examples 1 and 2.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-based graphene rust-resistant and corrosion-resistant primer, characterized in that: It is composed of component A and component B, wherein component A is a resin component and component B is a curing agent component, and the mass ratio of component A to component B is 1:1 to 1:3; Component A is composed of the following raw materials in parts by weight: 40-50 parts epoxy resin, 4-15 parts reactive diluent, 10-20 parts aluminum tripolyphosphate, 10-20 parts zinc phosphate and 15-30 parts barium sulfate. Component B is composed of the following raw materials in parts by mass: 20-200 parts water, 1-3 parts additives, 3-8 parts graphene, 0.5-1.5 parts AF-30, 3-8 parts zinc phosphate, 1-3 parts sodium pyrophosphate, 1-5 parts strontium chrome yellow, 1-5 parts zinc chrome yellow, and 100-250 parts epoxy curing agent stock solution.

2. The water-based graphene rust-resistant and corrosion-resistant primer according to claim 1, characterized in that, The epoxy resin is at least one of the grades E51 (128#) and E44 (6101#).

3. The water-based graphene rust-resistant and corrosion-resistant primer according to claim 1, characterized in that, The graphene component is an aqueous solution or dry powder of graphene, wherein the solid content of the added component accounts for 1% to 2% of the total solid content of the coating.

4. The water-based graphene rust-resistant and anti-corrosion primer according to claim 1, characterized in that, The additives are defoamers, dispersants, and wetting agents, and the additives correspond to any one or more of the grades 2105#, 154#, 5027#, and BYK190#. The reactive diluent is at least one of the grades AGE and XY622#.

5. The water-based graphene rust-resistant anti-corrosion primer according to claim 1, characterized in that, The epoxy curing agent stock solution is a binary or multi-component aliphatic amine or aromatic amine; the epoxy curing agent stock solution is any one or more of grades 228B, 3870#, and 3876#.

6. The water-based graphene rust-resistant anti-corrosion primer according to claim 1, characterized in that, The water is any one or more of municipal tap water, distilled water, and deionized water.

7. The water-based graphene rust-resistant and corrosion-resistant primer according to claim 1, characterized in that, The rust-converting agent used in the primer is composed of zinc chromate yellow, strontium chromate yellow, and sodium pyrophosphate.

8. A method for preparing a water-based graphene rust-resistant anti-corrosion primer as described in any one of claims 1-7, characterized in that, Includes the following steps: 1) Prepare the raw materials; 2) Add epoxy resin and reactive diluent to the dispersion vessel and disperse at 500 rpm for 5 min; 3) Slowly add zinc phosphate, aluminum tripolyphosphate and barium sulfate to the reactor. After that, increase the speed of the dispersion plate to 1500-2000 rpm and disperse for 20-40 minutes. 4) When the kettle temperature is ≥50℃, the dispersion stage ends and the mixture is transferred to a grinding mill for fine grinding. When the fineness is ≤25μm, the grinding stage ends. After filtration, the mixture is packaged, and the production of component A is complete. 5) Add the dispersion medium (water) and additives to the dispersion vessel and stir at low speed to dissolve the additives evenly; 6) Add the remaining solid pigments and fillers, disperse at high speed of 1500-2000 rpm for 20-35 min, and then grind in a mill; 7) When the fineness is ≤25μm, pour it into the mixing tank, add a certain amount of wetting agent first, then add epoxy curing agent stock solution, stir at low speed for 5 minutes, filter and package, and the synthesis of component B is now complete.

9. The method for preparing a water-based graphene rust-resistant anti-corrosion primer according to claim 8, characterized in that, The pigments and fillers are any one or more of graphene, zinc phosphate, aluminum tripolyphosphate, precipitated barium sulfate, nano-silica, flakes, and graphite powder.

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