CN113851254A - Conductive anti-corrosion material and application thereof in electric grounding - Google Patents
Conductive anti-corrosion material and application thereof in electric grounding Download PDFInfo
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- CN113851254A CN113851254A CN202110934187.2A CN202110934187A CN113851254A CN 113851254 A CN113851254 A CN 113851254A CN 202110934187 A CN202110934187 A CN 202110934187A CN 113851254 A CN113851254 A CN 113851254A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/016—Additives defined by their aspect ratio
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Abstract
The invention provides a conductive anti-corrosion material and application thereof in electric grounding, relating to the technical field of electric grounding grids. The conductive anti-corrosion material provided by the invention comprises carbon fiber cloth and a composite coating, wherein the composite coating comprises epoxy resin, a curing agent and a conductive filler, and the conductive filler comprises at least one of carbon fiber, graphite powder and carbon black. According to the technical scheme, the carbon fiber cloth is used as the framework of the conductive anti-corrosion material, the good conductive performance of the carbon fiber cloth is utilized, the space conductive framework is formed between the metal grounding material and the external soil, and the carbon fibers, the graphite powder with different granularities and the conductive carbon black powder in the epoxy resin are connected through the single-layer or multi-layer carbon fiber cloth space conductive framework to form a space conductive continuous phase, so that the formed conductive anti-corrosion material has excellent conductive current-dissipating capacity and anti-corrosion performance.
Description
Technical Field
The invention relates to the technical field of power grounding grids, in particular to a conductive anti-corrosion material and application thereof in power grounding.
Background
The grounding grid is an important facility in the power transmission and transformation industry and is used for guaranteeing the safety of power transmission and transformation equipment and personnel and the safe operation of power transmission. The grounding net material is mostly made of metal materials, such as carbon steel, galvanized steel, copper-clad steel and the like. The metal material is buried in the ground, and as the soil is a corrosive electrolyte, the soil can corrode the grounding metal material buried in the soil, so that the grounding material becomes thin and even breaks, the grounding performance of the corroded grounding material is reduced, the grounding resistance is increased, and the grounding requirements of power transmission and power transformation facilities cannot be met. When power utilization accidents or lightning strikes occur, fault currents and lightning currents cannot be smoothly discharged to the ground, and the fault currents and the lightning currents can possibly be connected into power transmission and transformation facilities in series, so that equipment damage, casualties and damage to power transmission and transformation operation safety are caused. Therefore, the corrosion resistance of the grounding material is very important.
The protection measures of the grounding material are generally divided into two types of grounding grid sacrificial anode cathodic protection and coating protection. The former is too fast to be used in the field of power transmission and transformation; the coating corrosion prevention technology cannot meet the grounding performance of the grounding material generally due to poor conductivity of the coating. Therefore, it is urgently needed to design an anti-corrosion material for a grounding grid, so that the grounding grid can show good grounding performance after coating while having good protective performance.
Disclosure of Invention
The invention mainly aims to provide an electric anti-corrosion material, aiming at solving the problem of poor protective performance of the existing grounding material.
In order to achieve the above object, in a first aspect, the present invention provides a conductive anticorrosive material, including carbon fiber cloth and a composite coating, wherein the composite coating includes an epoxy resin, a curing agent, and a conductive filler, and the conductive filler includes at least one of carbon fiber, graphite powder, and carbon black.
In the technical scheme of the invention, the carbon fiber cloth is used as the framework of the conductive anti-corrosion material, and has the functions of supporting, strengthening, conducting current and the like. And because the carbon fiber cloth has good conductivity, a space conductive framework can be formed between the metal grounding material and the external soil, and carbon fibers, graphite powder with different granularities and conductive carbon black powder in the epoxy resin are connected through the single-layer or multi-layer carbon fiber cloth space conductive framework to form a space conductive continuous phase, so that the formed conductive anticorrosive material has excellent conductive flow dispersing capacity, and the problem that the traditional conductive anticorrosive paint based on conductive filler cannot form a continuous phase of a conductive substance after film forming is solved. In addition, the composite material which is formed by organically combining the carbon fiber cloth composite coating and has the space conductive continuous phase also has excellent anti-corrosion performance.
As a preferred embodiment of the conductive anticorrosive material according to the present invention, the conductive filler includes carbon fibers, graphite powder, and carbon black, and the curing agent is a phenolic amine curing agent (T31 curing agent).
In the technical scheme of the invention, the conductive filler simultaneously comprises three raw materials of carbon fiber, graphite powder and carbon black, and if a single filler type is adopted, the size and the shape of the conductive filler are single, the conductivity and the viscosity of the composite coating are greatly influenced, and the optimal conductivity cannot be provided for the composite coating.
In a preferred embodiment of the conductive anticorrosive material according to the present invention, the mass of the conductive filler is 10 to 35% of the mass of the epoxy resin.
The inventor finds out through a large number of experiments that if the content of the conductive filler is lower than 10 percent, the conductive performance of the coating is poor; the bonding property and the mechanical property of the composite coating can be greatly reduced by simply increasing the proportion of the conductive filler, so that the protective capability of the coating is reduced, and if the content of the conductive filler is higher than 35%, the viscosity of the composite coating is higher, and the leveling, infiltration and defoaming cannot be completed.
As a preferable embodiment of the conductive anti-corrosion material, the monofilament diameter of the carbon fiber is 5-20um, and the length-diameter ratio is 2-8: 1; the mesh number of the graphite powder is 1000-1500 meshes; the particle size of the carbon black is 10-35 nm.
As a preferred embodiment of the conductive anticorrosive material according to the present invention, the carbon fiber cloth includes any one of graphitized carbon fiber woven fiber cloth or graphitized carbon fiber non-woven cloth.
In a preferred embodiment of the conductive anticorrosive material according to the present invention, the carbon fiber cloth has a thickness of 0.01 to 0.1 mm.
The inventor finds that the carbon fiber cloth has the best construction effect when the thickness is 0.01-0.1mm through a large number of tests. When the thickness of the carbon fiber cloth is more than 0.1mm, the problems of insufficient paint infiltration, excessively large volume of the conductive anti-corrosion material, increased porosity of the material and the like can be caused.
In a second aspect, the invention also provides the application of the conductive anti-corrosion material in electric grounding.
As a preferable embodiment of the application of the conductive anticorrosive material in electric power grounding, the conductive anticorrosive material is constructed in a manner of one cloth of two oils, two cloths of three oils or three cloths of four oils.
In the technical scheme of the invention, if the conductive anticorrosive material is applied to electric grounding in a mode of distributing two kinds of oil, the corresponding construction mode comprises the following steps:
(1) mixing epoxy resin and conductive filler, stirring at a high speed, sieving, and uniformly mixing with a curing agent to obtain a composite coating;
(2) cutting the carbon fiber cloth into a size matched with the grounding material, coating a composite coating on the surface of the grounding material, winding a layer of carbon fiber cloth on the surface of the grounding material in the condition that the composite coating is not dried, coating a conductive coating on the surface of the carbon fiber cloth, and repeatedly curing to obtain the conductive anticorrosive composite material for the grounding material.
The two-cloth three-oil and three-cloth four-oil are different from the one-cloth two-oil only in the number of coating times between the composite coating and the carbon fiber cloth.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the technical scheme, the carbon fiber cloth is used as the framework of the conductive anti-corrosion material, the good conductive performance of the carbon fiber cloth is utilized, the space conductive framework is formed between the metal grounding material and the external soil, and the carbon fibers, the graphite powder with different granularities and the conductive carbon black powder in the epoxy resin are connected through the single-layer or multi-layer carbon fiber cloth space conductive framework to form a space conductive continuous phase, so that the formed conductive anti-corrosion material has excellent conductive current-dissipating capacity and anti-corrosion performance.
(2) The conductive anticorrosive material provided by the invention is suitable for protecting a grounding grid of a power transmission system, a power transformation system and a power generation system in the field of electric power in a high-corrosion area, and the service life of a grounding metal material protected by the conductive anticorrosive material provided by the invention can be prolonged by 2-3 times.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Example 1
The conductive anticorrosive material comprises two parts, namely carbon fiber cloth and a composite coating, wherein the thickness of the carbon fiber cloth is 0.09mm, and the composite coating comprises the following components in parts by mass: 100 parts of epoxy resin, 40 parts of T31 curing agent, and conductive filler (comprising 3 parts of carbon fiber powder, 3 parts of graphite powder and 4 parts of carbon black); the monofilament diameter of the carbon fiber powder is 5 mu m, and the length-diameter ratio is 2: 1; the mesh number of the graphite powder is 1500 meshes; the particle size of the carbon black was 12 nm.
The preparation method of the composite coating of the embodiment comprises the following steps: and mixing carbon fiber powder, graphite powder, carbon black and epoxy resin, stirring at a high speed for 30min, sieving with a 120-mesh sieve, and mixing with a T31 curing agent to obtain the composite coating.
Experimental example 1
The conductive anticorrosive material prepared in example 1 is used as an application raw material, and is applied in a one-cloth two-oil coating mode, and the specific application method comprises the following steps: after the surface of the carbon steel grounding flat steel for the power grounding grid is treated, the composite coating is sprayed on the surface of the grounding flat steel, then a layer of carbon fiber cloth is wound, then a conductive coating is sprayed, and the conductive anticorrosive composite material of the grounding material is obtained after curing.
Example 2
The conductive anticorrosive material comprises two parts, namely carbon fiber cloth and a composite coating, wherein the thickness of the carbon fiber cloth is 0.09mm, and the composite coating comprises the following components in parts by mass: 100 parts of epoxy resin, 40 parts of T31 curing agent, and conductive filler (comprising 10 parts of carbon fiber powder, 10 parts of graphite powder and 15 parts of carbon black); the monofilament diameter of the carbon fiber powder is 10 mu m, and the length-diameter ratio is 8: 1; the mesh number of the graphite powder is 1000 meshes; the particle size of the carbon black was 12 nm.
The preparation method of the composite coating of this example is the same as that of example 1.
Experimental example 2
The conductive anticorrosive material prepared in example 2 is used as an application raw material, and a one-cloth two-oil coating mode is adopted for application, and the specific application method comprises the following steps: after the surface of the carbon steel grounding flat steel for the power grounding grid is treated, the composite coating is sprayed on the surface of the grounding flat steel, then a layer of carbon fiber cloth is wound, then a conductive coating is sprayed, and the conductive anticorrosive composite material of the grounding material is obtained after curing.
Example 3
The conductive anticorrosive material comprises two parts, namely carbon fiber cloth and a composite coating, wherein the thickness of the carbon fiber cloth is 0.1mm, and the composite coating comprises the following components in parts by mass: 100 parts of epoxy resin, 40 parts of T31 curing agent, and conductive filler (comprising 10 parts of carbon fiber powder, 10 parts of graphite powder and 5 parts of carbon black); the monofilament diameter of the carbon fiber powder is 7 mu m, and the length-diameter ratio is 4: 1; the mesh number of the graphite powder is 1200 meshes; the particle size of the carbon black was 35 nm.
The preparation method of the composite coating of this example is the same as that of example 1.
Experimental example 3
The conductive anticorrosive material prepared in example 3 is used as an application raw material, and a two-cloth three-oil coating mode is adopted for application, and the specific application method comprises the following steps: after the surface of the carbon steel grounding flat steel for the power grounding grid is treated, the composite coating is sprayed on the surface of the grounding flat steel, a layer of carbon fiber cloth is wound, then a layer of conductive coating is sprayed, and finally the grounding material conductive anti-corrosion composite material is obtained after curing.
Example 4
The conductive anticorrosive material comprises two parts, namely carbon fiber cloth and a composite coating, wherein the thickness of the carbon fiber cloth is 0.1mm, and the composite coating comprises the following components in parts by mass: 100 parts of epoxy resin, 40 parts of T31 curing agent, and conductive filler (comprising 10 parts of carbon fiber powder, 10 parts of graphite powder and 5 parts of carbon black); the monofilament diameter of the carbon fiber powder is 20 mu m, and the length-diameter ratio is 2: 1; the mesh number of the graphite powder is 1200 meshes; the particle size of the carbon black was 20 nm.
The preparation method of the composite coating of this example is the same as that of example 1.
Experimental example 4
The conductive anticorrosive material prepared in example 4 is used as an application raw material, and a three-cloth four-oil coating mode is adopted for application, and the specific application method comprises the following steps: after the surface of the carbon steel grounding flat steel for the power grounding grid is treated, the composite coating is sprayed on the surface of the grounding flat steel, a layer of carbon fiber cloth is wound, then a layer of conductive coating is sprayed, and finally a layer of conductive coating is sprayed, so that the grounding material conductive anticorrosion composite material is obtained after curing.
According to the GB/T10125-1997 artificial atmosphere corrosion test standard, GB/T3048.3-2007 electric wire and cable electrical property test method part 3: the semiconductive rubber-plastic material volume resistivity test standard is used for carrying out performance test on the grounding material conductive anti-corrosion composite material prepared in experimental examples 1-4, and the test results are shown in the following table 1.
TABLE 1 Performance test results of the conductive anticorrosive composite material prepared in Experimental examples 1-4
| Volume resistivity (omega cm) | Neutral salt spray test time (h) | |
| Experimental example 1 | <10 | 500 |
| Experimental example 2 | <1 | 800 |
| Experimental example 3 | <3 | 1500 |
| Experimental example 4 | <4 | 3500 |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The conductive anticorrosive material is characterized by comprising carbon fiber cloth and a composite coating, wherein the composite coating comprises epoxy resin, a curing agent and a conductive filler, and the conductive filler comprises at least one of carbon fiber, graphite powder and carbon black.
2. The conductive anticorrosion material of claim 1 wherein the conductive filler comprises carbon fiber, graphite powder and carbon black and the curing agent is a phenolic amine curing agent.
3. The conductive anticorrosion material of claim 1 wherein the mass of the conductive filler is 10 to 35% of the mass of the epoxy resin.
4. The conductive anticorrosive material according to claim 2, wherein the carbon fiber has a filament diameter of 5 to 20 μm and an aspect ratio of 2 to 8: 1.
5. The conductive anticorrosive material according to claim 2, wherein the mesh number of the graphite powder is 1000-1500 meshes.
6. The conductive anticorrosive material according to claim 2, wherein the carbon black has a particle size of 10 to 35 nm.
7. The conductive anticorrosive material according to claim 1, wherein the carbon fiber cloth comprises any one of a graphitized carbon fiber woven fiber cloth or a graphitized carbon fiber non-woven cloth.
8. The conductive anticorrosive material according to claim 1, wherein the carbon fiber cloth has a thickness of 0.01 to 0.1 mm.
9. Use of the conductive corrosion protection material according to any one of claims 1 to 8 in electrical grounding.
10. The use of the conductive anticorrosion material of claim 9 in electrical grounding, wherein the conductive anticorrosion material is applied in a two-oil-in-one, a three-oil-in-two, or a four-oil-in-three manner.
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| CN202110934187.2A CN113851254A (en) | 2021-08-13 | 2021-08-13 | Conductive anti-corrosion material and application thereof in electric grounding |
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| CN202110934187.2A CN113851254A (en) | 2021-08-13 | 2021-08-13 | Conductive anti-corrosion material and application thereof in electric grounding |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0730046A1 (en) * | 1995-03-01 | 1996-09-04 | EKO d.o.o. | Electroconductive anticorrosive system |
| CN103409033A (en) * | 2013-06-09 | 2013-11-27 | 广东电网公司电力科学研究院 | Conductive anticorrosive coating and preparation method thereof |
| CN105440891A (en) * | 2015-12-25 | 2016-03-30 | 海南大学 | Anticorrosive coating and preparation method thereof |
| CN105647339A (en) * | 2015-12-28 | 2016-06-08 | 浙江港流高分子科技有限公司 | Conductive antistatic coating, coiled material, and preparation method of coiled material |
| CN108384184A (en) * | 2018-03-06 | 2018-08-10 | 吉林化工学院 | A kind of preparation method of grounded screen graphite/thermosetting resin conducing composite material |
| CN109207019A (en) * | 2018-08-27 | 2019-01-15 | 国网河南省电力公司检修公司 | A kind of conductive anti-corrosion coating and preparation method thereof |
| CN110358253A (en) * | 2019-07-04 | 2019-10-22 | 武汉楚辰新材料科技有限公司 | For producing the composite material and preparation method of railway signal tank unit housings |
| CN111423692A (en) * | 2019-01-10 | 2020-07-17 | 山东非金属材料研究所 | Conductive composite material and preparation method thereof |
-
2021
- 2021-08-13 CN CN202110934187.2A patent/CN113851254A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0730046A1 (en) * | 1995-03-01 | 1996-09-04 | EKO d.o.o. | Electroconductive anticorrosive system |
| CN103409033A (en) * | 2013-06-09 | 2013-11-27 | 广东电网公司电力科学研究院 | Conductive anticorrosive coating and preparation method thereof |
| CN105440891A (en) * | 2015-12-25 | 2016-03-30 | 海南大学 | Anticorrosive coating and preparation method thereof |
| CN105647339A (en) * | 2015-12-28 | 2016-06-08 | 浙江港流高分子科技有限公司 | Conductive antistatic coating, coiled material, and preparation method of coiled material |
| CN108384184A (en) * | 2018-03-06 | 2018-08-10 | 吉林化工学院 | A kind of preparation method of grounded screen graphite/thermosetting resin conducing composite material |
| CN109207019A (en) * | 2018-08-27 | 2019-01-15 | 国网河南省电力公司检修公司 | A kind of conductive anti-corrosion coating and preparation method thereof |
| CN111423692A (en) * | 2019-01-10 | 2020-07-17 | 山东非金属材料研究所 | Conductive composite material and preparation method thereof |
| CN110358253A (en) * | 2019-07-04 | 2019-10-22 | 武汉楚辰新材料科技有限公司 | For producing the composite material and preparation method of railway signal tank unit housings |
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