A kind of anticorrosive coating material and its preparation method and application

Abstract

The present invention discloses an anticorrosive coating material and a preparation method and application thereof, and relates to the technical field of coating materials. The raw materials of the anticorrosive coating material of the present invention include the following components in parts by mass: 12-20 parts of acrylic resin, 25-35 parts of epoxy resin, 8-12 parts of polyether polyol, 12-15 parts of boron carbide, 8-10 parts of modified graphene, 10-15 parts of zinc powder and 1-2.5 parts of zirconium boride. The anticorrosive coating material of the present invention has excellent adhesion under thin layer coating, avoids the generation of surface defect problems, and has excellent anticorrosive performance when a small amount of zinc powder is added, does not agglomerate fillers, has excellent salt resistance and acid-base performance, and can meet the high anticorrosion requirements in harsh marine environments.

Description

Technical Field

[0001] The present invention relates to the technical field of coating materials, and in particular to an anti-corrosion coating material and a preparation method and application thereof. Background Art

[0002] With the rapid development of modern science and technology, the intensity of marine development has been continuously increased, and the task of maintaining maritime safety has become increasingly important. This has put forward increasingly higher performance requirements for marine facilities, marine equipment, ships and submarines.

[0003] The corrosion of equipment and facilities in the marine environment is the key to restricting their normal operation. The marine environment has the characteristics of high humidity, high temperature, high salt spray, etc. This harsh environment easily causes equipment to corrode, which in turn causes equipment failure, affecting the service life and normal operation of marine equipment, etc. Coating and anti-corrosion of marine equipment and facilities is an effective and important means.

[0004] At present, there are still some significant problems in the application of anti-corrosion coating products in marine corrosive environments. For example, for high-temperature application environments, only existing thin-layer anti-corrosion coatings (such as alkyd aluminum powder) can usually be used to treat marine equipment with anti-corrosion coatings, and the total dry film thickness of the coating is less than 100μm. Although the anti-corrosion effect of existing thin-layer coatings is limited, if thicker coatings are used, the temperature change environment is likely to cause the coating to crack or even fall off. For another example, zinc powder is a commonly used anti-corrosion filler in coating materials, but when the coating material is not further protected by topcoat, when the ambient temperature exceeds 420℃, the oxidation rate of zinc powder will be greatly accelerated, thereby causing surface defects in the coating.

[0005] In response to the marine corrosion environment of high humidity, high temperature, and high salt spray, as well as the high performance requirements for anti-corrosion coating materials in this harsh environment, researchers have introduced many types of coating material products. However, the performance of coating materials still has many shortcomings and it is difficult to meet the application requirements in harsh marine corrosion environments. Summary of the invention

[0006] The purpose of the present invention is to provide an anti-corrosion coating material and a preparation method and application thereof, so as to solve the problems existing in the above-mentioned prior art and meet the application requirements in harsh marine corrosion environments.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an anti-corrosion coating material, the raw materials of which include the following components in parts by weight:

[0009] 12-20 parts of acrylic resin, 25-35 parts of epoxy resin, 8-12 parts of polyether polyol, 12-15 parts of boron carbide, 8-10 parts of modified graphene, 10-15 parts of zinc powder and 1-2.5 parts of zirconium boride.

[0010] Furthermore, the preparation method of the modified graphene comprises the following steps:

[0011] The graphite oxide is added into a NaOH aqueous solution, heated to reflux, and centrifuged to obtain the modified graphene.

[0012] Furthermore, the concentration of the NaOH aqueous solution is 0.3-1 g / L.

[0013] Furthermore, the heating reflux time is 1-1.5h.

[0014] Furthermore, the mass volume ratio of the graphite oxide to the NaOH aqueous solution is 1-1.5 g:1 L.

[0015] Furthermore, the acrylic resin is B-67 thermosetting acrylic resin; the epoxy resin is epoxy resin 828; and the polyether polyol is polyether POP3628.

[0016] The present invention also provides a method for preparing the above-mentioned anti-corrosion coating material, comprising the following steps: mixing the raw material components according to a mass ratio to obtain the anti-corrosion coating material.

[0017] The present invention also provides application of the above anti-corrosion coating material as a marine anti-corrosion coating material.

[0018] The present invention further provides an anti-corrosion coating, which is obtained by coating the above anti-corrosion coating material on a substrate and then curing it.

[0019] The curing is performed at room temperature (preferably 25° C.) and the curing time is 5-7 days.

[0020] Furthermore, the thickness of the anti-corrosion coating is 80-100 μm.

[0021] Epoxy resin has excellent adhesion and high mechanical strength and is widely used in technical fields such as coatings and adhesives. However, it has significant performance defects such as poor heat resistance, poor impact toughness and brittleness, and cannot meet the application requirements of application fields with high performance requirements. Although researchers have made many performance improvements to epoxy resin, such as modification of nitrile rubber and chloroprene rubber, it is still difficult to meet the application requirements in harsh marine corrosion environments.

[0022] The present invention uses polyether polyol and acrylic resin to mix and modify epoxy resin, which significantly improves the heat resistance, impact resistance and other properties of the epoxy resin and ensures the adhesion of the anti-corrosion coating material under thin layer coating.

[0023] Graphene and zinc powder have a large specific surface area, and are very likely to agglomerate in the coating, affecting the performance of the coating material. The present invention modifies graphene oxide to avoid its agglomeration, and further adds boron carbide and zirconium boride components to the epoxy resin modified by mixing polyether polyol and acrylic resin, thereby ensuring the impact resistance, acid and alkali resistance, salt spray resistance and other properties of the coating. In addition, the boron carbide and zirconium boride in the present invention have extremely strong thermal stability, and based on the modified graphene and polyether polyol, acrylic resin and epoxy resin polymer, dense protection for zinc powder is formed, which can effectively protect the stability of a small amount of zinc powder added in the present invention in a high temperature environment, effectively improve its decomposition in a high temperature environment, and ensure the anti-corrosion effect of the coating in a harsh environment.

[0024] The zinc powder of the present invention is added in a small amount and will not agglomerate in the coating material. In addition, the thin layer coating of 80-100 μm of the present invention has excellent anti-corrosion performance and can meet the anti-corrosion requirements in harsh marine environments.

[0025] In the present invention, polyether polyol and acrylic resin have a significant effect on epoxy resin. Too little addition cannot improve the performance of the resin, while too much addition will cause the performance of the coating material to deteriorate. Similarly, boron carbide and zirconium boride components also need to be within an appropriate content range. Otherwise, too little addition cannot improve the coating performance, while too much addition will cause the coating to fall off and crack.

[0026] The present invention discloses the following technical effects:

[0027] The present invention improves the performance defects of epoxy resin in terms of heat resistance and impact resistance, ensures the adhesion of the anti-corrosion coating material under thin layer coating, and avoids the occurrence of surface defects. The coating material of the present invention has excellent anti-corrosion performance when a small amount of zinc powder is added, and filler agglomeration will not occur. It also has excellent salt resistance and acid-base resistance, and can meet the high anti-corrosion requirements in harsh marine environments.

[0028] The anti-corrosion coating material of the present invention is simple to prepare and has excellent performance, and is of great significance for promoting the development of marine anti-corrosion. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0030] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0031] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0032] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0033] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0034] In the following examples of the present invention, the acrylic resin used is B-67 type thermosetting acrylic resin, the epoxy resin used is epoxy resin 828, and the polyether polyol used is polyether POP3628.

[0035] Example 1

[0036] An anti-corrosion coating material, the raw materials have the following mass proportions:

[0037] 18 parts of acrylic resin, 30 parts of epoxy resin, 12 parts of polyether polyol, 14 parts of boron carbide, 9 parts of modified graphene, 14 parts of zinc powder and 2 parts of zirconium boride.

[0038] Preparation of anti-corrosion coating:

[0039] (1) Graphite oxide (particle size: 120 nm) was added to a 1 g / L NaOH aqueous solution at a mass volume ratio of 1.5 g:1 L. The resulting mixture was refluxed for 1.5 h under stirring, centrifuged, and dried to obtain modified graphene.

[0040] (2) Mix acrylic resin, polyether polyol and epoxy resin, then add modified graphene, stir again, add boron carbide and zirconium boride, then add zinc powder, stir evenly, and obtain an anti-corrosion coating.

[0041] Example 2

[0042] An anti-corrosion coating material, the raw materials have the following mass proportions:

[0043] 15 parts of acrylic resin, 28 parts of epoxy resin, 10 parts of polyether polyol, 12 parts of boron carbide, 10 parts of modified graphene, 12 parts of zinc powder and 1.5 parts of zirconium boride.

[0044] Preparation of anti-corrosion coating:

[0045] (1) Graphite oxide (particle size: 120 nm) was added to a 0.5 g / L NaOH aqueous solution at a mass volume ratio of 1.2 g:1 L. The resulting mixture was refluxed for 1 h under stirring, centrifuged, and dried to obtain modified graphene.

[0046] (2) Mix acrylic resin, polyether polyol and epoxy resin, then add modified graphene, stir again, add boron carbide and zirconium boride, then add zinc powder, stir evenly, and obtain an anti-corrosion coating.

[0047] Example 3

[0048] An anti-corrosion coating material, the raw materials have the following mass proportions:

[0049] 18 parts of acrylic resin, 30 parts of epoxy resin, 12 parts of polyether polyol, 12 parts of boron carbide, 8 parts of modified graphene, 12 parts of zinc powder and 2.5 parts of zirconium boride.

[0050] Preparation of anti-corrosion coating:

[0051] (1) Graphite oxide (particle size of 100 nm) was added to a 0.5 g / L NaOH aqueous solution at a mass volume ratio of 1.4 g:1 L. The resulting mixture was refluxed for 1 h under stirring, centrifuged, and dried to obtain modified graphene.

[0052] (2) Mix acrylic resin, polyether polyol and epoxy resin, then add modified graphene, stir again, add boron carbide and zirconium boride, then add zinc powder, stir evenly, and obtain an anti-corrosion coating.

[0053] Example 4

[0054] An anti-corrosion coating material, the raw materials have the following mass proportions:

[0055] 20 parts of acrylic resin, 35 parts of epoxy resin, 8 parts of polyether polyol, 14 parts of boron carbide, 8 parts of modified graphene, 14 parts of zinc powder and 2 parts of zirconium boride.

[0056] Preparation of anti-corrosion coating:

[0057] (1) Graphite oxide (particle size: 120 nm) was added to a 0.5 g / L NaOH aqueous solution at a mass volume ratio of 1.5 g:1 L. The resulting mixture was refluxed for 1 h under stirring, centrifuged, and dried to obtain modified graphene.

[0058] (2) Mix acrylic resin, polyether polyol and epoxy resin, then add modified graphene, stir again, add boron carbide and zirconium boride, then add zinc powder, stir evenly, and obtain an anti-corrosion coating.

[0059] Comparative Example 1

[0060] The only difference from Example 1 is that the polyether polyol is replaced by an equal amount of propylene oxide butyl ether.

[0061] Comparative Example 2

[0062] The only difference from Example 1 is that the graphene is not modified, and the modified graphene is replaced by an equal amount of graphene.

[0063] Comparative Example 3

[0064] The only difference from Example 1 is that the acrylic resin is replaced by an equal amount of epoxy resin.

[0065] Comparative Example 4

[0066] The only difference from Example 1 is that boron carbide and zirconium boride are not added, and are replaced by an equal amount of modified graphene.

[0067] The anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-4 were applied to the surface of a steel substrate and cured at 25° C. for 7 days to obtain an anti-corrosion coating with a thickness of 80 μm.

[0068] The performance of the anti-corrosion coatings prepared in the examples and comparative examples was tested, and the results are shown in Table 1:

[0069] Table 1

[0070]

[0071] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An anti-corrosion coating material, It is characterized in that The raw materials include the following components in parts by weight: 12-20 parts of acrylic resin, 25-35 parts of epoxy resin, 8-12 parts of polyether polyol, 12-15 parts of boron carbide, 8-10 parts of modified graphene, 10-15 parts of zinc powder and 1-2.5 parts of zirconium boride; The preparation method of the modified graphene comprises the following steps: Adding graphite oxide to a NaOH aqueous solution with a concentration of 0.3-1 g / L, heating and refluxing for 1-1.5 hours, and centrifuging to obtain the modified graphene; The mass volume ratio of the graphite oxide to the NaOH aqueous solution is 1-1.5 g:1 L; The acrylic resin is B-67 thermosetting acrylic resin; the epoxy resin is epoxy resin 828; the polyether polyol is polyether POP3628; The preparation method of the anti-corrosion coating material comprises the following steps: mixing the raw material components according to a mass ratio to obtain the anti-corrosion coating material.

2. Use of the anti-corrosion coating material as claimed in claim 1 as a marine anti-corrosion coating material.

3. An anti-corrosion coating, It is characterized in that The anti-corrosion coating material according to claim 1 is applied to a substrate and then cured.

4. The anti-corrosion coating according to claim 3, It is characterized in that The thickness of the anti-corrosion coating is 80-100 μm.

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