Long-acting outdoor steel structure anticorrosive coating structure

Abstract

The utility model discloses a long-acting outdoor steel structure anti-corrosion coating structure. An anti-corrosion coating is formed by compounding a substrate layer, a middle paint layer and an anti-corrosion wear-resistant layer which are sequentially coated on the surface of a base material from bottom to top, the substrate layer is a high-solid-content epoxy modified amine mica iron oxide paint layer; the middle paint layer is composed of a carbon fiber protective layer, a graphene middle layer and a glass fiber protective layer, and the graphene middle layer is located between the carbon fiber protective layer and the glass fiber protective layer; the anti-corrosion and wear-resistant layer is composed of an asparagus polyurea layer and a waterproof layer, and the thickness range of a dry film is 110-155 microns. The dry film thickness of the high-solid-content epoxy modified amine mica iron oxide paint layer ranges from 50 micrometers to 80 micrometers. According to the long-acting outdoor steel structure, the defects in the prior art are overcome, the coating is flat and smooth, the adhesive force is strong, the hardness is high, the chemical resistance and the weather resistance are good, the corrosion resistance and the weather resistance of the outer surface of the long-acting outdoor steel structure are greatly improved, the base material is prevented from being corroded for a long time, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-corrosion coatings, in particular to a long-acting outdoor steel structure anti-corrosion coating structure. Background Art

[0002] Since steel has good mechanical properties, steel structures are widely used in industrial and civil buildings. Steel structures are easily corroded due to the influence of the external environment, which also limits the vigorous development of steel structures. The corrosion and anti-corrosion of steel structures have become a major issue that cannot be ignored in the fields of materials science, chemical industry and engineering. The atmospheric corrosion usually referred to as atmospheric corrosion in steel structures in buildings is the corrosion caused by the electrochemical process of steel in the atmosphere due to the action of oxygen and moisture. Because of this, it is particularly important to adopt steel structure anti-corrosion technology. If the steel structure can be maintenance-free for more than 25 years, it will save a lot of maintenance costs and greatly improve the safety and service life of the steel structure.

[0003] At present, there are five main anti-corrosion technologies used in China, namely, weathering steel, hot-dip galvanizing, thermal spraying, cathodic protection and painting. Among them, weathering steel is made by adding a certain amount of corrosion-resistant metals such as phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, etc. to low-carbon steel, so that a dense and highly adherent protective film is formed on the surface of the steel material, which prevents the rust from spreading and developing inward and slows down its corrosion rate; hot-dip galvanizing is to immerse the rust-removed steel components in a high-temperature molten zinc liquid at about 600°C, so that a zinc layer is attached to the surface of the steel components, thereby achieving the purpose of corrosion prevention; thermal spraying is to melt the metal material (wire or powder) to be sprayed with the help of a certain heat source (flame or electric energy), use compressed air to atomize the metal droplets, and spray them at high speed onto the surface of the workpiece substrate that has been roughened. The droplets condense instantly when they hit the workpiece surface to form a metal coating; the principle of the cathodic protection method is to add a more active metal to the surface of the corroded metal structure, and the protected structure becomes the cathode, so that the electron migration caused by metal corrosion is inhibited, avoiding or weakening the occurrence of corrosion; the coating method is to form a physical or chemical barrier-a paint film through coating construction, which prevents and isolates the corrosive medium water and air from contacting the steel surface, so as to achieve the purpose of protecting steel.

[0004] The advantages and disadvantages of the five anti-corrosion technologies are as follows: Weathering steel is often used in outdoor structures, but its color can only be its natural color; the advantages of hot-dip galvanizing are long durability, high degree of industrialized production, and stable quality, but the cost is very high and the component size is limited. Therefore, it is widely used in outdoor steel structures that are severely corroded by the atmosphere and are difficult to repair; thermal spraying is a long-term anti-corrosion method with the same anti-corrosion effect as hot-dip galvanizing. The advantage of this process is that the shape and size of the components are almost unrestricted, but the cost is very high. It is often used in outdoor steel structures that have high requirements for anti-corrosion years and are difficult to repair; the cathodic protection method has a simple structure and is often used in underwater or underground structures; the coating method is generally not as corrosion-resistant as the long-term anti-corrosion method, but it has a series of advantages such as simple process, low cost, wide selection range, and strong applicability. Therefore, it is used more in indoor steel structures or relatively easy-to-repair outdoor steel structures. The anti-corrosion period is mostly 5 to 15 years, and it is also the most widely used anti-corrosion method in current projects.

[0005] The corrosion mechanism of outdoor steel structure is: the steel structure is exposed to the air for a long time, and chemically reacts with water vapor, sand and dust and other corrosive substances in the air, thus causing corrosion. The main corrosion process is as follows: because of long-term exposure to the external environment, the surface of the steel structure will undergo oxidation reaction, thereby forming an oxide film. During the corrosion process, various corrosive substances enter the oxide film. These corrosive substances mainly include dust particles in the air, toxic and harmful gases volatilized in the production activities of chemical plants, automobile exhaust in people's daily lives, and various pollutants. They enter the oxide film and react. Once the harmful substances released in production and life are released into the air and enter the film body, the conductivity of the water film will be increased, thereby accelerating the corrosion process. During the corrosion process, due to the strong conductivity of metal, metal acts as the anode in the chemical reaction. The main step of this chemical reaction is that the iron inside the metal segment steel structure loses electrons and becomes iron ions. These electrons flow into the cathode and further react. In this repeated process, electrochemical corrosion occurs, and the iron in the steel structure is reduced by a large number of chemical reactions. These chemical reactions will affect the surface of the steel structure and cause swelling inside the steel structure, affecting the stability of the steel structure bridge.

[0006] As the main anti-corrosion means for bridge steel structures, anti-corrosion coating plays an important role in the corrosion protection of bridge steel structures. The anti-corrosion coating structure mainly includes the surface layer, the middle layer and the bottom layer. The middle layer and the surface layer can effectively seal the holes and prevent aging, and the bottom layer ensures that there is no corrosion when a small amount of corrosive media passes through the surface layer and the middle layer. Therefore, the scientific design of the coating supporting system has important practical significance for improving the overall design level of the anti-corrosion coating system.

[0007] How to provide a long-lasting outdoor steel structure anti-corrosion coating structure with simple structure, convenient construction and strong applicability is a technical problem that needs to be solved urgently by technicians in this engineering field. Utility Model Content

[0008] In order to solve the problems mentioned in the above background technology, the utility model provides a long-lasting outdoor steel structure anti-corrosion coating structure.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A long-lasting outdoor steel structure anti-corrosion coating structure, the anti-corrosion coating is composed of a base layer, an intermediate paint layer and an anti-corrosion and wear-resistant layer which are sequentially coated on the surface of the substrate from bottom to top;

[0011] The base layer is a high-solid epoxy-modified amine mica iron oxide paint layer;

[0012] The middle paint layer is composed of a carbon fiber protective layer, a graphene middle layer and a glass fiber protective layer, and the graphene middle layer is located between the carbon fiber protective layer and the glass fiber protective layer;

[0013] The anti-corrosion and wear-resistant layer is an aspartame polyurea layer and a waterproof layer, and the dry film thickness ranges from 110 to 155 μm.

[0014] Preferably, the dry film thickness of the high-solid epoxy-modified amine mica iron oxide paint layer is in the range of 50-80 μm.

[0015] Preferably, the carbon fiber protective layer is located on the upper surface of the graphene middle layer, and the glass fiber protective layer is located on the lower end surface of the graphene middle layer.

[0016] Preferably, the glass fiber protective layer is located on the upper surface of the graphene middle layer, and the carbon fiber protective layer is located on the lower end surface of the graphene middle layer.

[0017] Preferably, the dry film thickness of the carbon fiber protective layer is in the range of 30-50 μm.

[0018] Preferably, the graphene intermediate layer has a dry film thickness in the range of 50-80 μm.

[0019] Preferably, the dry film thickness of the glass fiber protective layer is in the range of 40-60 μm.

[0020] Preferably, the waterproof layer is located on the upper surface of the asparagine polyurea layer, and the waterproof layer is a ceramic waterproof coating layer or an acrylic aliphatic polyurethane coating layer.

[0021] Preferably, the dry film thickness of the waterproof layer is in the range of 60-80 μm.

[0022] Preferably, the dry film thickness of the aspartame polyurea layer is in the range of 50-75 μm.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. The utility model adopts an anti-corrosion coating structure composed of a high-solid epoxy modified amine mica iron oxide paint layer, an intermediate paint layer and an anti-corrosion and wear-resistant layer. The coating is flat and smooth, has strong adhesion, high hardness, good chemical resistance and weather resistance, which greatly improves the corrosion resistance and weather resistance of the outer surface of the long-term outdoor steel structure, ensures that the substrate is not corroded for a long time, and extends the service life; the coating solvents in the anti-corrosion coating structure are all environmentally friendly solvents that do not contain benzene, esters, etc., and will not cause harm to construction personnel and the environment.

[0025] 2. The intermediate paint layer of the utility model is composed of a carbon fiber protective layer, a graphene intermediate layer and a glass fiber protective layer. By setting the graphene intermediate layer, the corrosion resistance provided by the graphene as the intermediate material can be guaranteed, and the carbon fiber protective layer and the glass fiber protective layer are used to further enhance the wear resistance and waterproofness of the overall coating structure. The carbon fiber anti-corrosion coating can effectively resist chemicals, oxidation and corrosion, thereby reducing the erosion of outdoor steel structures by external substances. It has high corrosion resistance and can remain stable for a long time in harsh environments such as acids, alkalis, and salts without falling off or changing. The glass fiber coating can maintain stability in high temperature environments and is not easy to age, thereby greatly extending the service life of the steel structure.

[0026] 3. The high-solid epoxy-modified amine mica iron oxide in the utility model is a two-component, high-performance epoxy anti-rust paint, which forms a solid paint film through chemical curing, effectively isolates the corrosive medium and provides long-term anti-corrosion protection; due to the presence of mica iron oxide, this coating structure has excellent durability, wear resistance and moisture resistance, and can resist a variety of corrosion factors, including high temperature, humidity and chemical corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of embodiments 1 and 2 of the utility model;

[0029] Figure 2 It is a schematic diagram of the structure of Embodiments 3 and 4 of the present utility model;

[0030] In the figure: base layer 1, middle paint layer 2, carbon fiber protective layer 201, graphene middle layer 202, glass fiber protective layer 203, anti-corrosion and wear-resistant layer 3, asparagine polyurea layer 301, waterproof layer 302. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Example 1

[0033] Reference Figure 1 , a long-lasting outdoor steel structure anti-corrosion coating structure, the anti-corrosion coating is composed of a base layer 1, an intermediate paint layer 2 and an anti-corrosion and wear-resistant layer 3 which are sequentially coated on the surface of the substrate from bottom to top;

[0034] The base layer 1 is a high-solid epoxy-modified amine micaceous iron oxide paint layer; the dry film thickness of the high-solid epoxy-modified amine micaceous iron oxide paint layer is 50 μm.

[0035] The intermediate paint layer 2 is composed of a carbon fiber protective layer 201, a graphene intermediate layer 202 and a glass fiber protective layer 203, and the graphene intermediate layer 202 is located between the carbon fiber protective layer 201 and the glass fiber protective layer 203; the carbon fiber protective layer 201 is located on the upper surface of the graphene intermediate layer 202, and the glass fiber protective layer 203 is located on the lower end surface of the graphene intermediate layer 202.

[0036] The dry film thickness of the carbon fiber protective layer 201 is in the range of 30 μm; the dry film thickness of the graphene intermediate layer 202 is in the range of 50 μm; and the dry film thickness of the glass fiber protective layer 203 is in the range of 40 μm.

[0037] The anti-corrosion and wear-resistant layer 3 is an aspartame polyurea layer 301 and a waterproof layer 302; the dry film thickness of the waterproof layer 302 is in the range of 60 μm; the dry film thickness of the aspartame polyurea layer 301 is in the range of 50 μm.

[0038] The waterproof layer 302 is located on the upper surface of the asparagine polyurea layer 301 , and the waterproof layer 302 is a ceramic waterproof coating layer.

[0039] Example 2

[0040] Reference Figure 1, a long-lasting outdoor steel structure anti-corrosion coating structure, the anti-corrosion coating is composed of a base layer 1, an intermediate paint layer 2 and an anti-corrosion and wear-resistant layer 3 which are sequentially coated on the surface of the substrate from bottom to top;

[0041] The base layer 1 is a high-solid epoxy-modified amine micaceous iron oxide paint layer; the dry film thickness of the high-solid epoxy-modified amine micaceous iron oxide paint layer is 60 μm.

[0042] The intermediate paint layer 2 is composed of a carbon fiber protective layer 201, a graphene intermediate layer 202 and a glass fiber protective layer 203, and the graphene intermediate layer 202 is located between the carbon fiber protective layer 201 and the glass fiber protective layer 203; the carbon fiber protective layer 201 is located on the upper surface of the graphene intermediate layer 202, and the glass fiber protective layer 203 is located on the lower end surface of the graphene intermediate layer 202.

[0043] The dry film thickness of the carbon fiber protective layer 201 is in the range of 40 μm; the dry film thickness of the graphene intermediate layer 202 is in the range of 60 μm; and the dry film thickness of the glass fiber protective layer 203 is in the range of 50 μm.

[0044] The anti-corrosion and wear-resistant layer 3 is an aspartame polyurea layer 301 and a waterproof layer 302; the dry film thickness of the waterproof layer 302 is in the range of 70 μm; the dry film thickness of the aspartame polyurea layer 301 is in the range of 60 μm.

[0045] The waterproof layer 302 is located on the upper surface of the asparagine polyurea layer 301 , and the waterproof layer 302 is a ceramic waterproof coating layer.

[0046] Example 3

[0047] Reference Figure 2 , a long-lasting outdoor steel structure anti-corrosion coating structure, the anti-corrosion coating is composed of a base layer 1, an intermediate paint layer 2 and an anti-corrosion and wear-resistant layer 3 which are sequentially coated on the surface of the substrate from bottom to top;

[0048] The base layer 1 is a high-solid epoxy-modified amine micaceous iron oxide paint layer; the dry film thickness of the high-solid epoxy-modified amine micaceous iron oxide paint layer is 75 μm.

[0049] The intermediate paint layer 2 is composed of a carbon fiber protective layer 201, a graphene intermediate layer 202 and a glass fiber protective layer 203, and the graphene intermediate layer 202 is located between the carbon fiber protective layer 201 and the glass fiber protective layer 203; the glass fiber protective layer 203 is located on the upper surface of the graphene intermediate layer 202, and the carbon fiber protective layer 201 is located on the lower end surface of the graphene intermediate layer 202.

[0050] The dry film thickness of the carbon fiber protective layer 201 is in the range of 45 μm; the dry film thickness of the graphene intermediate layer 202 is in the range of 75 μm; and the dry film thickness of the glass fiber protective layer 203 is in the range of 55 μm.

[0051] The anti-corrosion and wear-resistant layer 3 is an aspartame polyurea layer 301 and a waterproof layer 302; the dry film thickness of the waterproof layer 302 is in the range of 75 μm; the dry film thickness of the aspartame polyurea layer 301 is in the range of 70 μm.

[0052] The waterproof layer 302 is located on the upper surface of the asparagine polyurea layer 301 , and the waterproof layer 302 is an acrylic aliphatic polyurethane coating layer.

[0053] Example 4

[0054] Reference Figure 2 , a long-lasting outdoor steel structure anti-corrosion coating structure, the anti-corrosion coating is composed of a base layer 1, an intermediate paint layer 2 and an anti-corrosion and wear-resistant layer 3 which are sequentially coated on the surface of the substrate from bottom to top;

[0055] The base layer 1 is a high-solid epoxy-modified amine micaceous iron oxide paint layer; the dry film thickness of the high-solid epoxy-modified amine micaceous iron oxide paint layer is 80 μm.

[0056] The intermediate paint layer 2 is composed of a carbon fiber protective layer 201, a graphene intermediate layer 202 and a glass fiber protective layer 203, and the graphene intermediate layer 202 is located between the carbon fiber protective layer 201 and the glass fiber protective layer 203; the glass fiber protective layer 203 is located on the upper surface of the graphene intermediate layer 202, and the carbon fiber protective layer 201 is located on the lower end surface of the graphene intermediate layer 202.

[0057] The dry film thickness of the carbon fiber protective layer 201 is in the range of 50 μm; the dry film thickness of the graphene intermediate layer 202 is in the range of 80 μm; and the dry film thickness of the glass fiber protective layer 203 is in the range of 60 μm.

[0058] The anti-corrosion and wear-resistant layer 3 is an aspartame polyurea layer 301 and a waterproof layer 302; the dry film thickness of the waterproof layer 302 is in the range of 80 μm; the dry film thickness of the aspartame polyurea layer 301 is in the range of 75 μm.

[0059] The waterproof layer 302 is located on the upper surface of the asparagine polyurea layer 301 , and the waterproof layer 302 is an acrylic aliphatic polyurethane coating layer.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A long-lasting outdoor steel structure anti-corrosion coating structure, characterized by: The anti-corrosion coating is composed of a base layer (1), an intermediate paint layer (2) and an anti-corrosion and wear-resistant layer (3) which are sequentially coated on the surface of the substrate from bottom to top; The base layer (1) is a high-solid epoxy-modified amine mica iron oxide paint layer; The intermediate paint layer (2) is composed of a carbon fiber protective layer (201), a graphene intermediate layer (202) and a glass fiber protective layer (203), and the graphene intermediate layer (202) is located between the carbon fiber protective layer (201) and the glass fiber protective layer (203); The anti-corrosion and wear-resistant layer (3) comprises an aspartame polyurea layer (301) and a waterproof layer (302).

2. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 1 is characterized by: The dry film thickness of the high-solid epoxy-modified amine mica iron oxide paint layer is in the range of 50-80 μm.

3. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 1 is characterized by: The carbon fiber protective layer (201) is located on the upper surface of the graphene middle layer (202), and the glass fiber protective layer (203) is located on the lower end surface of the graphene middle layer (202).

4. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 1 is characterized by: The glass fiber protective layer (203) is located on the upper surface of the graphene middle layer (202), and the carbon fiber protective layer (201) is located on the lower end surface of the graphene middle layer (202).

5. A long-lasting outdoor steel structure anticorrosion coating structure according to claim 3 or 4, characterized in that: The dry film thickness of the carbon fiber protective layer (201) is in the range of 30-50 μm.

6. A long-lasting outdoor steel structure anticorrosion coating structure according to claim 3 or 4, characterized in that: The graphene intermediate layer (202) has a dry film thickness ranging from 50 to 80 μm.

7. A long-lasting outdoor steel structure anticorrosion coating structure according to claim 3 or 4, characterized in that: The dry film thickness of the glass fiber protective layer (203) is in the range of 40-60 μm.

8. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 1 is characterized by: The waterproof layer (302) is located on the upper surface of the asparagine polyurea layer (301), and the waterproof layer (302) is a ceramic waterproof coating layer or an acrylic aliphatic polyurethane coating layer.

9. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 8 is characterized by: The dry film thickness of the waterproof layer (302) is in the range of 60-80 μm.

10. The long-lasting outdoor steel structure anticorrosion coating structure according to claim 1, characterized in that: The dry film thickness of the aspartame polyurea layer (301) is in the range of 50-75 μm.

Images