Antistatic composite steel pipe with epoxy resin coating

Abstract

The utility model discloses an antistatic composite steel pipe with an epoxy resin coating, and belongs to the technical field of composite steel pipes. Comprising a first layer, a second layer, a third layer and a fourth layer which are sequentially combined from inside to outside, the first layer is a metal base pipe layer, the metal base pipe layer is a base body supporting structure of the whole composite steel pipe, the second layer is a transition combination layer, the transition combination layer is made of epoxy resin materials, and the fourth layer is made of epoxy resin materials. Wherein the third layer is a conductive net-shaped layer, the conductive net-shaped layer is formed by compounding carbon fibers and graphene according to the mass ratio of 3: 1, and through the arrangement of the conductive net-shaped layer, when a conveying medium generates static electricity, charges can be quickly guided out, so that the static electricity can be quickly discharged; the surface potential of the pipeline is lower than the safety threshold value of the explosion dangerous environment, the carbon fiber and graphene compounded structure of the conductive net-shaped layer can further inhibit electrochemical corrosion, and the service life of the composite steel pipe is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of composite steel pipe technology, and in particular to an antistatic composite steel pipe with an epoxy resin coating. Background Technology

[0002] Composite steel pipes, as a high-performance pipe material, combine the advantages of metal steel pipes with those of other materials, and are widely used in many fields such as construction, municipal engineering, and petrochemicals. This type of pipe not only possesses the high strength and toughness of steel pipes, enabling it to withstand significant pressure and external impacts and ensuring the safe and stable operation of pipeline systems, but also incorporates the corrosion resistance and insulation properties of other materials, effectively extending the service life of the pipeline and reducing maintenance costs.

[0003] However, in practical applications, composite steel pipes face serious electrostatic safety issues. While the insulating coating of ordinary composite steel pipes (such as epoxy resin coatings) can effectively isolate corrosive media, it also prevents static electricity from dissipating. When transporting flammable liquids such as benzene and gasoline, static electricity can easily accumulate in the pipes. This accumulation can trigger spark discharges, leading to explosions. Furthermore, existing antistatic technologies (such as metal plating and conductive coatings) have defects such as poor interlayer adhesion and easy failure of the conductive network, failing to meet the safety requirements of explosion-proof environments. Utility Model Content

[0004] The purpose of this invention is to solve the problems of static electricity accumulation, interlayer delamination and conductive failure in existing composite steel pipes, and to propose an antistatic composite steel pipe with an epoxy resin coating.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An antistatic composite steel pipe with an epoxy resin coating includes a four-layer structure joined from the inside out. The four layers are a first layer, a second layer, a third layer, and a fourth layer. The first layer is a metal base pipe layer, which is the base support structure of the entire composite steel pipe.

[0007] The second layer is a transition bonding layer, which is composed of epoxy resin material, wherein 5% to 15% by mass of nano-alumina particles are uniformly dispersed therein.

[0008] The third layer is a conductive mesh layer, which is formed by carbon fiber and graphene in a mass ratio of 3:1. The two materials are interwoven to form a three-dimensional network structure with spatial connectivity.

[0009] The fourth layer is a surface functional layer. The surface functional layer uses epoxy resin as the base material and adds 1% to 3% conductive carbon black by mass. The epoxy resin layer has a structural feature of varying curing degree along the thickness direction.

[0010] Preferably, the metal base pipe layer is a hot-dip galvanized steel pipe with a wall thickness of 2-8 mm.

[0011] Preferably, the thickness of the transition bonding layer is 0.1-0.3 mm.

[0012] Preferably, in the three-dimensional network structure of the conductive mesh layer, the contact angle between the carbon fiber and the graphene is less than 30°, forming a continuous conductive path.

[0013] Preferably, the thickness of the surface functional layer is 0.05-0.2 mm.

[0014] Compared with the prior art, this utility model provides an antistatic composite steel pipe with an epoxy resin coating, which has the following beneficial effects:

[0015] This invention, by setting a conductive mesh layer, can quickly discharge the charge when the transported medium generates static electricity, so that the surface potential of the pipeline is lower than the safety threshold of the explosive hazardous environment. In addition, the carbon fiber and graphene composite structure of the conductive mesh layer can also inhibit electrochemical corrosion and effectively extend the service life of the composite steel pipe. By setting a transition bonding layer, it can effectively prevent the penetration of corrosive media. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the picture:

[0018] 1. Metal base tube layer; 2. Transition bonding layer; 3. Conductive mesh layer (3); 4. Surface functional layer. Detailed Implementation

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

[0020] Reference Figure 1 An antistatic composite steel pipe with an epoxy resin coating includes a four-layer structure joined from the inside out. The four layers are the first layer, the second layer, the third layer and the fourth layer. The first layer is a metal base pipe layer 1, which is the base support structure of the entire composite steel pipe. The metal base pipe layer 1 is a hot-dip galvanized steel pipe with a wall thickness of 2-8mm.

[0021] The second layer is a transition bonding layer 2, which is composed of epoxy resin material, in which 5% to 15% by mass of nano-alumina particles are uniformly dispersed. The thickness of the transition bonding layer 2 is 0.1-0.3 mm, and the modified epoxy resin is coated by high-pressure airless spraying process.

[0022] The third layer is a conductive mesh layer 3, which is formed by carbon fiber and graphene in a mass ratio of 3:1. The two materials are interwoven to form a three-dimensional network structure with spatial connectivity. In the three-dimensional network structure of the conductive mesh layer 3, the contact angle between carbon fiber and graphene is less than 30°, forming a continuous conductive path. The three-dimensional conductive network is formed by electrostatic flocking.

[0023] The fourth layer is the surface functional layer 4, which uses epoxy resin as the base material and adds 1% to 3% conductive carbon black by mass. The epoxy resin layer has a structure with a gradient of curing degree along the thickness direction. The thickness of the surface functional layer 4 is 0.05-0.2mm. By setting a conductive mesh layer, when the transported medium generates static electricity, the charge can be quickly discharged, so that the surface potential of the pipeline is lower than the safety threshold of the explosive hazardous environment. In addition, the carbon fiber and graphene composite structure of the conductive mesh layer can also inhibit electrochemical corrosion and effectively extend the service life of the composite steel pipe. By setting a transition bonding layer, it can effectively prevent the penetration of corrosive media.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An antistatic composite steel pipe with an epoxy resin coating, comprising a four-layer structure joined sequentially from the inside out, the four layers being a first layer, a second layer, a third layer, and a fourth layer, characterized in that: The first layer is a metal base pipe layer (1), which is the base support structure of the entire composite steel pipe; The second layer is a transition bonding layer (2), which is composed of epoxy resin material, wherein nano-alumina particles with a mass percentage of 5% to 15% are uniformly dispersed therein. The third layer is a conductive mesh layer (3), which is formed by carbon fiber and graphene in a mass ratio of 3:1, and the two materials are interwoven to form a three-dimensional network structure with spatial connectivity. The fourth layer is a surface functional layer (4). The surface functional layer (4) uses epoxy resin as the base material and adds 1% to 3% conductive carbon black by mass. The epoxy resin of the surface functional layer (4) forms a structure with a gradient of curing degree along the thickness direction.

2. The antistatic composite steel pipe with epoxy resin coating according to claim 1, characterized in that, The metal base pipe layer (1) is a hot-dip galvanized steel pipe with a wall thickness of 2-8 mm.

3. The antistatic composite steel pipe with epoxy resin coating according to claim 1, characterized in that, The thickness of the transition bonding layer (2) is 0.1-0.3 mm.

4. The antistatic composite steel pipe with epoxy resin coating according to claim 1, characterized in that, In the three-dimensional network structure of the conductive mesh layer (3), the contact angle between carbon fiber and graphene is less than 30°, forming a continuous conductive path.

5. The antistatic composite steel pipe with epoxy resin coating according to claim 1, characterized in that, The thickness of the surface functional layer (4) is 0.05-0.2 mm.

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