Colorful paint with flash rust prevention function and preparation method thereof

Abstract

The colorful paint with the flash rust prevention function comprises basic paint, a continuous phase and protective glue, the basic paint comprises a graphene modified fluorine-containing self-crosslinking acrylic emulsion; the graphene modified fluorine-containing self-crosslinking acrylic emulsion is a graphene modified fluorine-containing self-crosslinking acrylic emulsion in which the content of modified graphene oxide accounts for 0.5% by mass and the content of dodecafluoroheptyl methacrylate accounts for 0.5% by mass; the continuous phase comprises a silane coupling agent and a modified polyurethane emulsion; the modified polyurethane emulsion is a polyurethane emulsion of conjugated benzimidazole obtained by connecting 2-(2-benzimidazolyl) ethanethiol (BET) to a polyurethane side chain through a thiol-ene click reaction. The colorful coating with the flash rust prevention function combines an anti-rust effect with a colorful coating, can be directly sprayed on the surface of industrial steel, is convenient to construct, is water-based and environment-friendly, and not only has a good decorative effect, but also has good flash rust prevention performance.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a multi-colored coating with an anti-flash rust function and a preparation method thereof. Background Art

[0002] Corrosion will cause huge waste of metal resources. By applying anti-corrosion coatings, the service life of metals can be extended and the utilization efficiency of resources can be improved. Existing solvent-based coatings contain a large amount of organic solvents, but there are many problems in terms of safety and environmental protection, and the color is single and does not have a high decorative effect. Combining the anti-rust function with water-based colorful coatings for the interior and exterior walls of buildings will not only have a realistic marble decorative effect, but also have good rust resistance. It will definitely occupy an important position in industrial coatings in the future. Ordinary colorful coatings can only be used on the interior and exterior walls of buildings, and do not have rust resistance. The development of a new type of industrial anti-rust colorful coating has become a technical problem that needs to be overcome. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a multi-color coating with anti-flash rust function and a preparation method thereof. The multi-color coating with anti-flash rust function prepared by the present invention combines the anti-rust effect with the multi-color coating, can be directly sprayed on the surface of industrial steel, is convenient to construct, is water-based and environmentally friendly, and not only has a good decorative effect, but also has a good anti-flash rust performance.

[0004] To solve the above problems, the present invention is implemented through the following technical solutions:

[0005] The first invention object of the present invention is:

[0006] Provided is a multi-colored coating with an anti-flash rust function, comprising the following components in parts by weight:

[0007] 40-60 parts of base paint, 30-50 parts of continuous phase, 10-20 parts of protective glue;

[0008] The base paint includes a graphene-modified fluorine-containing self-crosslinking acrylic emulsion. The specific preparation method thereof is detailed in Chinese patent document CN110105485A, a graphene-modified fluorine-containing self-crosslinking styrene-acrylic emulsion, an anti-corrosion coating and a preparation method.

[0009] The graphene-modified fluorine-containing self-crosslinking acrylic emulsion is a graphene-modified fluorine-containing self-crosslinking acrylic emulsion in which the content of modified graphene oxide accounts for 0.5% by mass and the content of dodecafluoroheptyl methacrylate accounts for 0.5% by mass;

[0010] The continuous phase includes a silane coupling agent and a modified polyurethane emulsion;

[0011] The modified polyurethane emulsion is a conjugated benzimidazole polyurethane emulsion obtained by connecting 2-(2-benzimidazole-based) ethanethiol (BET) to a polyurethane side chain through a thiol-ene click reaction.

[0012] For the specific preparation method, please refer to Click reaction benzimidazole into waterbornepolyurethane toward anti-flashing rust, self-healing, robust coatings. Chemical Engineering Journal 468(2023)143573.

[0013] (Preparation and performance study of a new type of anti-flash rust, strong and self-healing imidazole-based waterborne polyurethane)

[0014] The further optimization of the multi-colored coating with anti-flash rust function of the present invention is as follows:

[0015] The silane coupling agent is one or a combination of γ-propyltrimethoxysilane and γ-aminopropyltriethoxysilane.

[0016] The further optimization of the multi-colored coating with anti-flash rust function of the present invention is as follows:

[0017] The base paint comprises the following components in parts by weight:

[0018] 10-25 parts of deionized water, 0.5-1 parts of dispersant, 0.5-2 parts of cellulose, 0.1-0.5 parts of pH regulator, 1-2 parts of titanium dioxide, 5-10 parts of kaolin, 2-5 parts of microspheres, 35-75 parts of graphene-modified fluorine-containing self-crosslinking acrylic emulsion, 1-3 parts of film-forming aid, 0.5-1.5 parts of bactericide, 0.1-0.3 parts of defoamer, 2-5 parts of antifreeze, 0.5-1.5 parts of thickener; and / or

[0019] The continuous phase comprises the following components in parts by weight:

[0020] 5-10 parts of deionized water, 1-4 parts of film-forming aid, 0.1-2 parts of preservative, 20-60 parts of graphene-modified fluorine-containing self-crosslinking acrylic emulsion, 25-50 parts of modified polyurethane emulsion, 3-5 parts of silane coupling agent, 0.1-0.3 parts of defoaming agent, 1.5-3.5 parts of antifreeze agent; and / or

[0021] The protective glue comprises the following components in parts by weight:

[0022] 85-95 parts of deionized water, 5-15 parts of lithium magnesium silicate, and 0.1-0.5 parts of fungicide.

[0023] The further optimization of the multi-colored coating with anti-flash rust function of the present invention is as follows:

[0024] The base paint comprises the following preparation steps:

[0025] Add deionized water according to the proportion, start stirring at 200-500r / min, add cellulose, dispersant, titanium dioxide, and kaolin;

[0026] Increase the speed to 800-1200r / min and disperse for 20 minutes;

[0027] The speed is reduced to 300-500 r / min, and microspheres, graphene-modified fluorine-containing self-crosslinking acrylic emulsion, film-forming aid, bactericide, defoamer, antifreeze agent, pH regulator and thickener are added, and stirred evenly to prepare the base paint.

[0028] The further optimization of the multi-colored coating with anti-flash rust function of the present invention is as follows:

[0029] The continuous phase comprises the following preparation steps:

[0030] Deionized water is added in proportion, stirring is started at 500-800 r / min, and film-forming aid, preservative, graphene-modified fluorine-containing self-crosslinking acrylic emulsion, modified polyurethane emulsion, silane coupling agent, defoaming agent, antifreeze agent are added in sequence, and stirring is performed uniformly to prepare the continuous phase.

[0031] The further optimization of the multi-colored coating with anti-flash rust function of the present invention is as follows:

[0032] The protective glue comprises the following preparation steps:

[0033] Add deionized water to the mixing equipment according to the proportion, start stirring at 100-300 r / min, add lithium magnesium silicate and bactericide, adjust the speed to 1000-1500 r / min and disperse at high speed for 30-45 minutes to prepare the protective glue.

[0034] The second object of the present invention is:

[0035] A method for preparing the aforementioned multi-colored coating with anti-flash rust function is provided, characterized in that:

[0036] It comprises the following preparation steps:

[0037] S1. Adjust the color of the base paint as needed and stir evenly;

[0038] S2. Add protective glue and the base paint whose color has been adjusted in step S1 into the reactor, use a four-blade paddle to make cuts, add the continuous phase after the cuts are completed, mix well, and obtain the colorful paint with anti-flash rust function.

[0039] The multi-colored paint with anti-flash rust function of the present invention has a base paint with a graphene-modified fluorinated styrene-acrylic emulsion added, and a specific modified polyurethane emulsion added in a continuous phase, so that the prepared multi-colored paint has a super strong anti-rust performance without adding an anti-flash rust agent, can be directly sprayed on a metal surface, is convenient to construct, is water-based and environmentally friendly, has not only a good decorative effect, but also a good anti-rust performance, thereby broadening the application of water-based paint. DETAILED DESCRIPTION

[0040] In order to make the application, technical scheme and advantages of the present invention clearer, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention. All simple improvements to the preparation method of the present invention under the premise of the present invention are within the protection scope of the present invention.

[0041] Example 1

[0042] A method for preparing a colorful coating with anti-flash rust function, comprising the following components in parts by weight:

[0043] 50 parts of base paint, 30 parts of continuous phase, 20 parts of protective glue;

[0044] The base paint comprises a graphene-modified fluorine-containing self-crosslinking acrylic emulsion;

[0045] The graphene-modified fluorine-containing self-crosslinking acrylic emulsion is a graphene-modified fluorine-containing self-crosslinking acrylic emulsion in which the content of modified graphene oxide accounts for 0.5% by mass and the content of dodecafluoroheptyl methacrylate accounts for 0.5% by mass;

[0046] The continuous phase includes a silane coupling agent and a modified polyurethane emulsion;

[0047] The modified polyurethane emulsion is a polyurethane emulsion of conjugated benzimidazole formed by introducing benzimidazole into the polyurethane chain through a thiol-ene click reaction.

[0048] It comprises the following preparation steps:

[0049] S1. Adjust the color of the base paint as needed and stir evenly;

[0050] S2. Add protective glue and the base paint whose color has been adjusted in step S1 into the reactor, use a four-blade paddle to make cuts, add the continuous phase after the cuts are completed, mix well, and obtain the colorful paint with anti-flash rust function.

[0051] in:

[0052] Preparation of base paint:

[0053] Add 17.5 parts of deionized water according to the proportion, start stirring at 200-500r / min, add 0.8 parts of cellulose, 0.7 parts of dispersant, 1 part of titanium dioxide, and 5 parts of kaolin;

[0054] Increase the speed to 800-1200r / min and disperse for 20 minutes;

[0055] The speed is reduced to 300-500 r / min, 2.5 parts of microspheres, 66.5 parts of graphene-modified fluorine-containing self-crosslinking acrylic emulsion, 1.5 parts of film-forming aid, 0.5 parts of bactericide, 0.2 parts of defoamer, 2.5 parts of antifreeze, 0.5 parts of pH regulator and 0.8 parts of thickener are added, and stirred evenly to prepare the base paint.

[0056] Preparation of continuous phase:

[0057] Add 5 parts of deionized water in proportion, start stirring at 500-800 r / min, add 3 parts of film-forming aid, 1.4 parts of preservative, 55 parts of graphene-modified fluorinated self-crosslinking acrylic emulsion, 31 parts of modified polyurethane emulsion, 3 parts of silane coupling agent, 0.1 parts of defoaming agent, 1.5 parts of antifreeze agent in sequence, stir evenly to prepare the continuous phase.

[0058] Preparation of protective glue:

[0059] Add 92.8 parts of deionized water to the mixing equipment according to the proportion, start stirring at 100-300 r / min, add 7 parts of lithium magnesium silicate and 0.2 parts of fungicide, adjust the speed to 1000-1500 r / min and disperse at high speed for 30-45 minutes to prepare the protective glue.

[0060] Implementation 2 and Comparative Examples 1 to 4 were prepared according to the preparation method of Example 1, wherein some raw material compositions were different, as shown in Table 1 below.

[0061] Table 1 Specific raw material composition table of each embodiment and comparative example experimental group (weight parts)

[0062]

[0063] The multi-colored paint with anti-flash rust function of the present invention is applied by spraying, and can be sprayed on the surface of an object using a multi-colored spray gun.

[0064] The samples of Examples 1 to 2 and Comparative Examples 1 to 4 were sprayed on tinplate sheets to test their initial flash rust resistance, including salt spray resistance test and 3% NaCl resistance test.

[0065] The test results are shown in Table 2 below.

[0066] Table 2 Performance test results

[0067]

[0068]

[0069] in conclusion:

[0070] 1. Comparative Example 4 is a multi-colored coating prepared using commercially available common acrylic emulsion and polyurethane emulsion. The salt spray resistance test time is 28 hours and rust occurs. The resistance to 3% NaCl has a large number of rust spots.

[0071] 2. Comparative Example 3, adding anti-flash rust agent to the formula did not significantly improve the salt spray resistance test results.

[0072] 3. Adding only graphene-modified fluorinated acrylic emulsion (Comparative Example 2) or modified polyurethane emulsion (Comparative Example 1) to the formula improves the coating performance, but the effect is not much different.

[0073] 4. In Examples 1 to 2, adding graphene-modified fluorinated acrylic emulsion and novel polyurethane emulsion to the coating at the same time can significantly improve the anti-rust performance of the coating, and the effect is significantly improved.

[0074] In summary, the colorful coating with anti-rust function prepared by the present invention has extremely high anti-rust performance, and the simultaneous addition of the graphene-modified fluorinated acrylic emulsion and the novel polyurethane emulsion achieves unexpected anti-rust performance.

[0075] To sum up, the embodiments of the present invention are only preferred examples of the present invention and do not limit the present invention in any form. Any equivalent changes made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent examples of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0078] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0079] Unless otherwise indicated, percentages and parts are by weight.

[0080] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0081] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A colorful paint with anti-flash rust function, Features: It includes the following components by weight: 40-60 parts of base paint, 30-50 parts of continuous phase, 10-20 parts of protective glue; The base paint comprises a graphene-modified fluorine-containing self-crosslinking acrylic emulsion; The graphene-modified fluorine-containing self-crosslinking acrylic emulsion is a graphene-modified fluorine-containing self-crosslinking acrylic emulsion in which the content of modified graphene oxide accounts for 0.5% by mass and the content of dodecafluoroheptyl methacrylate accounts for 0.5% by mass; The continuous phase includes a silane coupling agent and a modified polyurethane emulsion; The modified polyurethane emulsion is a conjugated benzimidazole polyurethane emulsion obtained by connecting 2-(2-benzimidazole-based) ethanethiol (BET) to the polyurethane side chain through a thiol-ene click reaction.

2. The multi-colored paint with anti-flash rust function according to claim 1, Features: The silane coupling agent is one or a combination of γ-propyltrimethoxysilane and γ-aminopropyltriethoxysilane.

3. The multi-colored paint with anti-flash rust function according to claim 1, Features: The base paint comprises the following components in parts by weight: 10-25 parts of deionized water, 0.5-1 parts of dispersant, 0.5-2 parts of cellulose, 0.1-0.5 parts of pH regulator, 1-2 parts of titanium dioxide, 5-10 parts of kaolin, 2-5 parts of microspheres, 35-75 parts of graphene-modified fluorine-containing self-crosslinking acrylic emulsion, 1-3 parts of film-forming aid, 0.5-1.5 parts of bactericide, 0.1-0.3 parts of defoamer, 2-5 parts of antifreeze, 0.5-1.5 parts of thickener; and / or The continuous phase comprises the following components in parts by weight: 5-10 parts of deionized water, 1-4 parts of film-forming aid, 0.1-2 parts of preservative, 20-60 parts of graphene-modified fluorine-containing self-crosslinking acrylic emulsion, 25-50 parts of modified polyurethane emulsion, 3-5 parts of silane coupling agent, 0.1-0.3 parts of defoaming agent, 1.5-3.5 parts of antifreeze agent; and / or The protective glue comprises the following components in parts by weight: 85-95 parts of deionized water, 5-15 parts of lithium magnesium silicate, and 0.1-0.5 parts of fungicide.

4. The multi-colored paint with anti-flash rust function according to claim 3, Features: The base paint comprises the following preparation steps: Add deionized water according to the proportion, start stirring at 200-500r / min, add cellulose, dispersant, titanium dioxide, and kaolin; Increase the speed to 800-1200r / min and disperse for 20 minutes; The speed is reduced to 300-500 r / min, and microspheres, graphene-modified fluorine-containing self-crosslinking acrylic emulsion, film-forming aid, bactericide, defoamer, antifreeze agent, pH regulator and thickener are added, and stirred evenly to prepare the base paint.

5. The multi-colored paint with anti-flash rust function according to claim 3, Features: The continuous phase comprises the following preparation steps: Deionized water is added in proportion, stirring is started at 500-800 r / min, and film-forming aid, preservative, graphene-modified fluorine-containing self-crosslinking acrylic emulsion, modified polyurethane emulsion, silane coupling agent, defoaming agent, antifreeze agent are added in sequence, and stirring is performed uniformly to prepare the continuous phase.

6. The multi-colored paint with anti-flash rust function according to claim 3, Features: The protective glue comprises the following preparation steps: Add deionized water to the mixing equipment according to the proportion, start stirring at 100-300 r / min, add lithium magnesium silicate and bactericide, adjust the speed to 1000-1500 r / min and disperse at high speed for 30-45 minutes to prepare the protective glue.

7. A method for preparing the multi-colored coating with anti-flash rust function according to claim 1, Features: It comprises the following preparation steps: S1. Adjust the color of the base paint as needed and stir evenly; S2. Add protective glue and the base paint whose color has been adjusted in step S1 into the reactor, use a four-blade paddle to make cuts, add the continuous phase after the cuts are completed, mix well, and obtain the colorful paint with anti-flash rust function.

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