Coating structure and underwater equipment

Abstract

The utility model relates to the technical field of marine equipment, and provides a coating structure and underwater equipment, which are laid on the surface of steel and comprise an anti-corrosion bottom layer, a paint layer and a surface layer. Wherein the anti-corrosion bottom layer is attached to the surface of steel; the paint layer is attached to the side, back to steel, of the anti-corrosion bottom layer. The surface layer comprises an acid-resistant layer and an impact-resistant layer which are sequentially overlaid, and the acid-resistant layer is attached to the side, back to the anti-corrosion bottom layer, of the paint layer. The three layers of composite coatings are mutually combined and stacked to form a stable and effective protective layer, so that the marine equipment can be effectively protected. And the service life and the anti-corrosion life of the steel structure are effectively prolonged, the later-period anti-corrosion maintenance cost of the steel structure can be remarkably reduced, and important economic benefits and social benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of marine equipment, in particular to a coating structure and an underwater device. Background Art

[0002] In marine equipment, corrosion problems exist from shallow sea to deep sea. Deep-sea equipment includes manned submersibles, submarines, underwater pipelines, torpedoes, etc. Compared with the shallow-sea environment, there are huge pressures, as well as serious problems such as temperature, dissolved oxygen, pH value, biological fouling, metal ion deposition, and surface flow velocity in the deep-sea environment. This brings great difficulties to the research and development of the deep sea, making many mature technologies in the sea surface and shallow sea unable to be applied in the deep sea.

[0003] In addition to facing damage such as electrochemical corrosion and biochemical corrosion of seawater on the surface of the marine pressure-resistant cabin, the greater the seawater load during operation, the more severe the matrix corrosion. Once the surface of the equipment coating fails, a tragedy of shipwreck and human death is likely to occur. Traditional anti-corrosion coatings only provide simple paint surface protection, and their surface density and protection cannot meet the usage requirements of the marine environment. Especially in the deep-sea environment, the bonding performance of the protective layer is poor, affecting the anti-corrosion performance of marine equipment.

[0004] Therefore, there is an urgent need for a coating structure and an underwater device to solve the above technical problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a coating structure and an underwater device, which can form a protective layer with relatively strong comprehensive ability on the surface of steel, effectively extending the service life and anti-corrosion life of the steel structure.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A coating structure is laid on the surface of steel and includes:

[0008] An anti-corrosion bottom layer, which adheres to the surface of the steel;

[0009] A paint layer, which adheres to the side of the anti-corrosion bottom layer facing away from the steel;

[0010] A surface layer, which includes an acid-resistant layer and an impact-resistant layer stacked in sequence, and the acid-resistant layer adheres to the side of the paint layer facing away from the anti-corrosion bottom layer.

[0011] As a preferred technical solution of the above coating structure, the anti-corrosion bottom layer is a nano fluorocarbon anti-corrosion coating layer.

[0012] As a preferred technical solution of the above coating structure, the thickness of the anti-corrosion bottom layer is from 40 μm to 50 μm.

[0013] As a preferred technical solution of the above coating structure, the porosity of the nano fluorocarbon anti-corrosion coating layer is 0.5 - 2.0%.

[0014] As a preferred technical solution of the above coating structure, the paint layer is an epoxy coal tar anti-corrosion paint, and the thickness of the paint layer is 85μm to 105μm.

[0015] As a preferred technical solution of the above coating structure, the surface layer further includes a silicon oxide ceramic coating, and the silicon oxide ceramic coating is attached to the side of the impact-resistant layer facing away from the acid-resistant layer.

[0016] As a preferred technical solution of the above coating structure, the surface layer further includes an aqueous acrylic polyurethane topcoat layer, and the aqueous acrylic polyurethane topcoat layer is attached to the side of the impact-resistant layer facing away from the acid-resistant layer.

[0017] As a preferred technical solution of the above coating structure, the thickness of the impact-resistant layer is not less than 1 / 3 of the film thicknesses of the anti-corrosion bottom layer, the paint layer and the acid-resistant layer.

[0018] As a preferred technical solution of the above coating structure, the thickness of the anti-corrosion bottom layer is less than the thickness of the paint layer.

[0019] An underwater device is also provided, which is characterized in that it includes a housing and the above coating structure, and the coating structure is disposed on the outer surface of the housing.

[0020] Advantages of the present utility model:

[0021] The present utility model provides a coating structure, which is laid on the surface of steel and includes an anti-corrosion bottom layer, a paint layer and a surface layer. Among them, the anti-corrosion bottom layer is attached to the surface of the steel; the paint layer is attached to the side of the anti-corrosion bottom layer facing away from the steel; the surface layer includes an acid-resistant layer and an impact-resistant layer stacked in sequence, and the acid-resistant layer is attached to the side of the paint layer facing away from the anti-corrosion bottom layer.

[0022] An anti-corrosion bottom layer, a paint layer, and a surface layer are sequentially laid on the steel surface to form a three-layer composite coating structure. Among them, the anti-corrosion bottom layer has corrosion resistance and excellent adhesion performance to the steel, and dries relatively quickly at room temperature, which can reduce the coating time of the bottom layer coating; the paint layer combines the advantages of the coating and the paint coating for sealing and isolating the coating, and has good sealing performance, corrosion resistance, weather resistance, water resistance, and salt spray resistance, and has long-term anti-corrosion ability in the marine environment, which can effectively prevent the erosion and adhesion of the marine environment and marine microorganisms to the steel; the surface layer has high gloss, is smooth and plump, has good film-forming properties, strong water resistance, and has high resistance to ultraviolet aging performance, which can significantly improve the anti-corrosion ability of the steel body in a high-humidity and high-salt spray environment. Through the combination and stacking of the three-layer composite coating, a stable and effective protective layer is formed, which can effectively protect marine equipment. It can effectively extend the service life and anti-corrosion life of the steel structure, significantly reduce the later anti-corrosion maintenance cost of the steel structure, and has important economic and social benefits.

[0023] Furthermore, the surface layer includes an acid-resistant layer and an impact-resistant layer. Among them, the acid-resistant layer is composed of a paint base consisting of a hydroxyl-containing resin, a pigment, an additive, and an organic solvent, and an aliphatic polyisocyanate as a curing agent, and can only be used after being mixed in proportion, which improves the chemical resistance of the anti-corrosion composite coating and further improves the protection ability of the acid-resistant layer for the steel. The impact-resistant layer is a polyurethane topcoat. Polyurethane can resist various medium and low-intensity impacts, temperature deformations, and has good adhesion and weather resistance, which can prevent the steel from being damaged by external forces such as excessive seawater loads, and play a protective role for both the steel body and the coating. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present invention and these drawings.

[0025] Figure 1 It is a schematic structural diagram of the coating structure (including the silicon oxide ceramic coating) provided by the embodiment of the present invention;

[0026] Figure 2 is Figure 1 a partial enlarged view of part A in

[0027] Figure 3 It is a schematic structural diagram of the coating structure (waterborne acrylic polyurethane topcoat layer) provided by the embodiment of other utility models.

[0028] In the figure:

[0029] 110, Anticorrosive bottom layer; 120, Paint layer; 130, Surface layer; 131, Acid-resistant layer; 132, Impact-resistant layer; 133, Silicon oxide ceramic coating; 134, Waterborne acrylic polyurethane topcoat layer;

[0030] 200, Steel. Detailed implementation mode

[0031] The following further describes the present utility model in detail with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] Such as Figures 1 to 3As shown, the present invention provides a coating structure applied to the surface of steel 200, comprising an anti-corrosion base layer 110, a paint layer 120, and a surface layer 130. The anti-corrosion base layer 110 is attached to the surface of the steel 200; the paint layer 120 is attached to the side of the anti-corrosion base layer 110 facing away from the steel 200; and the surface layer 130 comprises an acid-resistant layer 131 and an impact-resistant layer 132 stacked in sequence, with the acid-resistant layer 131 attached to the side of the paint layer 120 facing away from the anti-corrosion base layer 110.

[0036] An anti-corrosion primer layer 110, a paint layer 120, and a surface layer 130 are sequentially applied to the surface of steel 200, forming a three-layer composite coating structure. The anti-corrosion primer layer 110 is corrosion-resistant and has excellent adhesion to the steel 200. It also dries quickly at room temperature, reducing the time required to apply the primer layer. The paint layer 120 combines the advantages of both a coating and a paint-based sealing and isolation coating, offering excellent sealing, corrosion resistance, weather resistance, water resistance, and salt spray resistance. It exhibits long-lasting corrosion resistance in marine environments and effectively prevents erosion and adhesion of the marine environment and marine microorganisms to the steel 200. The surface layer 130 is high in gloss, smooth, and full, with excellent film-forming properties, strong water resistance, and high resistance to UV aging, significantly improving the corrosion resistance of the steel 200 in high-humidity, high-salt spray environments. The three composite coating layers are combined and stacked to form a stable and effective protective layer that effectively protects marine equipment. It can effectively extend the service life and anti-corrosion life of steel 200 structures, significantly reduce the cost of anti-corrosion maintenance of steel 200 structures in the later stage, and has important economic and social benefits.

[0037] Furthermore, the surface layer 130 includes an acid-resistant layer 131 and an impact-resistant layer 132. The acid-resistant layer 131 comprises a lacquer base composed of a hydroxyl-containing resin, pigments, additives, and an organic solvent, with an aliphatic polyisocyanate as a curing agent. These components are mixed in a suitable proportion for use, thereby enhancing the chemical resistance of the anti-corrosion composite coating and further improving the protective capability of the acid-resistant layer 131 against the steel 200. The impact-resistant layer 132 is a polyurethane topcoat. Polyurethane is resistant to various low- to medium-intensity impacts, temperature deformation, and exhibits excellent adhesion and weather resistance. This protects the steel 200 from external forces such as excessive seawater loads, which could damage the coating and provide protection for both the steel 200 and the coating.

[0038] Optionally, the anti-corrosion bottom layer 110 is a nano fluorocarbon anti-corrosion coating layer. Specifically, fluorocarbon coatings are a general term for a series of coatings with fluororesin as the main film-forming substance. Fluorocarbon resins have a large number of C—F chemical bonds. The bond energy of the C—F bond is as high as 485.6 kJ / mol, so it has a small polarity and a stable molecular structure. Structurally, the structural unit of fluorocarbon resin contains 3 Fs, forming a helical three-dimensional arrangement that tightly surrounds each C—C bond in the molecule, filling the gaps between C—C bonds, and ensuring the integrity and tightness of the structure to the greatest extent. This prevents the penetration of many liquids and gases into the paint film. In addition to excellent corrosion resistance, fluorocarbon resin also has excellent comprehensive properties such as weather resistance, chemical resistance, and stain resistance.

[0039] In this way, the steel plate with the nano fluorocarbon anti-corrosion coating layer can be protected from corrosion in a humid environment, and has good wear resistance and adhesion ability, which can enhance the connection tightness between the anti-corrosion bottom layer 110 and the steel 200.

[0040] Exemplarily, in this embodiment, the anti-corrosion bottom layer 110 is composed of anatase nano-titanium dioxide with a particle size of 3-5 nanometers, fluorocarbon resin, aliphatic isocyanate, high-grade pigments, additives, and solvents.

[0041] Optionally, the thickness of the anti-corrosion bottom layer 110 is 40μm to 50μm. After a nano fluorocarbon anti-corrosion coating layer with a certain thickness forms a film, it has chemical inertness and high sealing performance, which can effectively protect the steel 200 and ensure rapid drying at room temperature, reducing the total coating time.

[0042] Optionally, the porosity of the nano fluorocarbon anti-corrosion coating layer is 0.5-2.0%. Porosity refers to the percentage of the pore volume in a bulk material to the total volume of the material in its natural state. By using nano materials with a certain porosity, the drying rate can be increased, and at the same time, the wear resistance and mechanical strength of the anti-corrosion coating can be enhanced, and haze and floating dust are not easily attached to the surface of the coating, reducing the maintenance frequency and cost.

[0043] Preferably, the spraying thickness of the anti-corrosion bottom layer 110 is 40μm to 50μm and the porosity of the nano fluorocarbon anti-corrosion coating layer is 0.5-2.0%. The porosity in this range makes the nano fluorocarbon anti-corrosion coating layer have appropriate support force and resilience, and has a dense protection structure, which can protect the steel 200 body. And the coating is formed by spraying, and the adhesion strength between the coating and the steel 200 is high, ensuring the antibacterial and anti-corrosion effect.

[0044] Exemplarily, in this embodiment, the porosity of the nano fluorocarbon anti-corrosion coating layer is specifically 2.0% and the spraying thickness is 50μm.

[0045] Optionally, the paint layer 120 is an epoxy coal tar anti-corrosion paint, and the thickness of the paint layer 120 is 85 μm to 105 μm. Specifically, the epoxy coal tar paint is prepared by adding the internationally recognized long-life chlorosulfonated polyethylene rubber, mica iron oxide, other corrosion-resistant pigments and fillers, special additives and active solvents, etc. on the basis of the traditional epoxy coal tar coating through an advanced process. The double-component long-term heavy anti-corrosion coating is prepared. Through the modification of the traditional epoxy coal tar by the chlorosulfonated polyethylene rubber with excellent anti-corrosion performance, an interpenetrating network anti-corrosion coating is formed between the epoxy resin chain and the rubber chain after curing, which has low water absorption, good water resistance, strong resistance to microbial erosion, and high anti-permeability. In this way, the epoxy coal tar layer plays a protective role on the steel 200 including the anti-corrosion bottom layer 110, can avoid the material corrosion of the steel 200 body caused by the life activities in the ocean, further enhance the weather resistance of the anti-corrosion coating, and the epoxy group can also increase the interfacial bonding force between the paint layer 120 and the anti-corrosion bottom layer 110 and the surface layer 130, greatly improving the anti-permeability of the coating system.

[0046] In this embodiment, the paint layer 120 is prepared from epoxy resin, coal tar pitch, rust-inhibiting pigment, additives, and modified amine; it has rapid drying, good adhesion, and good flexibility, and can effectively prevent the erosion and attachment of marine microorganisms.

[0047] Exemplarily, the spraying thickness of the paint layer 120 is 85 μm.

[0048] Optionally, the surface layer 130 further includes a silicon oxide ceramic coating 133, and the silicon oxide ceramic coating 133 is attached to the side of the impact-resistant layer 132 facing away from the acid-resistant layer 131. In this way, the silicon oxide ceramic coating 133 can enhance the physical properties such as the hardness and wear resistance of the surface layer 130, thereby improving the strength and service life of the composite coating, and also has a certain anti-permeability, so that the protected steel 200 is not easily damaged, and the aesthetics of the surface of the composite coating is enhanced.

[0049] The silicon oxide ceramic coating 133 is formed on the surface of the impact-resistant layer 132 by plasma spraying, and a plasma spraying device with argon as the main gas and hydrogen as the auxiliary gas is used for spraying. The coating has good compactness, fewer molten particles, can prevent the erosion and attachment of marine microorganisms, and has excellent anti-corrosion performance.

[0050] In other embodiments, the surface layer 130 further includes an aqueous acrylic polyurethane topcoat layer 134, which is attached to the side of the impact-resistant layer 132 facing away from the acid-resistant layer 131. Specifically, acrylic polyurethane is a two-component self-drying coating with a paint composed of high-grade acrylic resin, pigments, additives, solvents, etc. as the hydroxyl component and aliphatic isocyanate as the other component. It has excellent weather resistance, good film decoration performance, good chemical resistance, excellent light and color retention performance, and high adhesion. Further, by providing the aqueous acrylic polyurethane topcoat layer 134 on the steel 200 through the surface layer 130, the composite coating has a certain hydrophilicity, reducing the seawater load and resistance of the steel 200 coated with the composite coating in deep water.

[0051] Optionally, the thickness of the impact-resistant layer 132 is not less than 1 / 3 of the film thicknesses of the anti-corrosion bottom layer 110, the paint layer 120, and the acid-resistant layer 131. Since when the thickness of the impact layer is too low, the greater the seawater load it receives during operation in the deep-sea environment, causing damage and corrosion to other coatings on the surface of the steel 200 body, thereby affecting the anti-corrosion performance of the overall composite coating.

[0052] Optionally, the thickness of the anti-corrosion bottom layer 110 is less than the thickness of the paint layer 120. In this way, the relatively small thickness of the anti-corrosion bottom layer 110 as an anti-corrosion layer can accelerate drying and ensure the bonding tightness with the steel 200. If the thickness of the anti-corrosion bottom layer 110 is too high, on the one hand, it affects the adhesion to the steel 200, and on the other hand, if the thickness of the paint layer 120 is too low, it cannot achieve the effect of a closed isolation coating, and the salt spray resistance performance is affected, thus affecting the anti-corrosion performance of the overall composite coating.

[0053] The surface treatment process of the above-mentioned steel 200 is as follows:

[0054] S1. Sandblast to Sa2.5 level, and the surface of the steel 200 that has been sandblasted or hand-rusted should be sprayed with a nano fluorocarbon anti-corrosion coating within 1 hour.

[0055] S2. Spray epoxy coal tar anti-corrosion paint within half an hour.

[0056] S3. Coat an acid-resistant layer 131 with a thickness of 20 μm and an impact-resistant layer 132 with a thickness of 60 μm. The thickness of the impact-resistant layer 132 should not be less than 1 / 3 of the film thicknesses of the anti-corrosion bottom layer 110, the intermediate paint layer 120, and the acid-resistant layer 131 to ensure the impact resistance performance in the deep-sea environment and prevent the damage of other paint layers such as the anti-corrosion bottom layer 110.

[0057] S4. Spray a 30-μm silicon oxide ceramic coating 133 with a carrier gas flow rate of 1 NLPM, a powder feeding rate of 50 g / min, and a spraying distance of 80 mm.

[0058] An underwater device is also provided, which includes a housing and the above coating structure, and the coating structure is disposed on the outer surface of the housing.

[0059] In addition, the above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A coating structure is laid on the surface of a steel material (200), characterized in that, Comprising: An anti-corrosion base layer (110) attached to the surface of the steel (200); A paint layer (120) attached to the side of the anti-corrosion base layer (110) facing away from the steel (200); A surface layer (130) including an acid-resistant layer (131) and an impact-resistant layer (132) stacked in sequence, and the acid-resistant layer (131) is attached to the side of the paint layer (120) facing away from the anti-corrosion base layer (110).

2. The coating structure according to claim 1, characterized in that, The anti-corrosion base layer (110) is a nano-fluorocarbon anti-corrosion coating layer.

3. The coating structure according to claim 2, wherein The thickness of the anti-corrosion base layer (110) is 40 μm to 50 μm.

4. The coating structure according to claim 2, characterized in that The porosity of the nano-fluorocarbon anti-corrosion coating layer is 0.5 - 2.0%.

5. The coating structure according to claim 1, characterized in that, The paint layer (120) is an epoxy coal tar anti-corrosion paint, and the thickness of the paint layer (120) is 85 μm to 105 μm.

6. The coating structure according to claim 1, characterized in that, The surface layer (130) further includes a silicon oxide ceramic coating (133) attached to the side of the impact-resistant layer (132) facing away from the acid-resistant layer (131).

7. The coating structure according to claim 1, wherein, The surface layer (130) further includes an aqueous acrylic polyurethane topcoat layer (134) attached to the side of the impact-resistant layer (132) facing away from the acid-resistant layer (131).

8. The coating structure according to claim 1, wherein, The thickness of the impact-resistant layer (132) is not less than 1 / 3 of the film thickness of the anti-corrosion base layer (110), the paint layer (120), and the acid-resistant layer (131).

9. The coating structure according to claim 1, wherein The thickness of the anti-corrosion base layer (110) is less than the thickness of the paint layer (120).

10. Underwater device, characterized in that, Comprising a housing and the coating structure according to any one of claims 1 - 9, and the coating structure is disposed on the outer surface of the housing.

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