CN111326272B - Method for preparing slow-release graphite resistance-reducing paste - Google Patents
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- CN111326272B CN111326272B CN202010230623.3A CN202010230623A CN111326272B CN 111326272 B CN111326272 B CN 111326272B CN 202010230623 A CN202010230623 A CN 202010230623A CN 111326272 B CN111326272 B CN 111326272B
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/18—Conductive material dispersed in non-conductive inorganic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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- H—ELECTRICITY
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- 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
Abstract
The invention relates to a slow-release graphite resistance-reducing paste and a preparation method and application thereof, wherein the slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 30-40% of graphite-based flexible resistance-reducing cloth particles, 20-25% of bentonite, 10-15% of sodium sulfate solution and 25-30% of vegetable oil. The slow-release graphite resistance-reducing paste can be buried in soil along with a grounding electrode, can be used as a resistance-reducing agent to be buried around a grounding body, and the contained ionic liquid is slowly released into the soil, so that a conductive film is effectively formed, the resistivity of the soil around the grounding body is reduced, and the grounding resistance of a power transmission line is better reduced.
Description
Technical Field
The invention relates to the technical field of lightning protection grounding of a power system, in particular to a slow-release graphite resistance-reducing paste and a preparation method and application thereof.
Background
With the development of social power systems, the grounding system of the power transmission line is of great importance, the qualification of the grounding resistance of the grounding grid of the power transmission line is the basis of the safe operation of the power system, and is also an important parameter for measuring the effectiveness and the safety of the grounding system and identifying whether the grounding system meets the design requirements.
In some areas with high soil resistivity, a graphite-based flexible grounding body is often used as a main material, meanwhile, a resistance reducing agent is used as an auxiliary material for reducing the grounding resistance of a power transmission line tower, the resistance reducing effect is obvious, but the resistance reducing agent also has the problems of unstable resistance reducing effect, loss of resistance reducing effect, soil pollution and the like in the use process.
Disclosure of Invention
The invention aims to solve the technical problems and provide a slow-release graphite resistance-reducing paste as well as a preparation method and application thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: the slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 30-40% of graphite-based flexible resistance-reducing cloth particles, 20-25% of bentonite, 10-15% of sodium sulfate and 25-30% of vegetable oil.
The slow-release graphite resistance-reducing paste is further optimized by the following steps: the vegetable oil is one or any mixture of soybean oil, rapeseed oil, peanut oil, corn oil, sunflower seed oil, palm oil, tea seed oil, olive oil, rice bran oil, sesame oil and safflower seed oil.
The slow-release graphite resistance-reducing paste is further optimized by the following steps: the sodium sulfate is powder anhydrous sodium sulfate particles.
The slow-release graphite resistance-reducing paste is further optimized by the following steps: the graphite-based flexible resistance reducing cloth particles are obtained by crushing graphite-based flexible resistance reducing cloth, and the graphite-based flexible resistance reducing cloth is prepared by compounding expandable graphite and glass fibers.
The slow-release graphite resistance-reducing paste is further optimized by the following steps: the particle size of the expandable graphite is 80 meshes, the carbon content is more than or equal to 99 percent, and the expansion volume is 180 mL/g.
A method for preparing a slow-release graphite resistance-reducing paste comprises the following steps:
s1, taking graphite-based flexible resistance reducing cloth, and crushing the graphite-based flexible resistance reducing cloth by using a crusher to obtain graphite-based flexible resistance reducing cloth particles;
s2, taking the raw materials according to the proportion of claim 1 for later use;
s3, pre-mixing the graphite-based flexible resistance-reducing cloth particles and bentonite in a mixing barrel, uniformly mixing, putting the obtained mixture into a colloid mill, grinding and stirring, adding vegetable oil and a sodium sulfate solution, fully grinding and stirring to obtain the slow-release graphite resistance-reducing paste.
The method for the slow-release graphite resistance-reducing paste is further optimized as follows: the preparation method of the graphite-based flexible resistance reducing cloth in the S1 comprises the following steps:
a. setting the temperature of the puffing furnace to 900 deg.C, feeding the expandable graphite into the puffing furnace at a feeding speed of 1.8-2.2kg/min when the temperature of the puffing furnace reaches 900 deg.C, puffing at high temperature in the puffing furnace for 12-18s to form expanded graphite worms, feeding the expanded graphite worms into a pre-pressing device, and grinding the expanded graphite worms into granules with a thickness of 0.3-0.5mm and a density of 0.2-0.3g/cm3The graphite film of (3);
b. spreading glass fibers on the surface of a graphite film at intervals, and coating a solid glue doped with a penetrating agent on the surface of the glass fibers, which is in contact with the graphite film;
c. compounding the glass fiber and the graphite film and transmitting the glass fiber and the graphite film to drying equipment together to ensure that the penetrant fully permeates into the glass fiber and the graphite film to be bonded;
d. and paving a layer of expanded graphite worms with the thickness of 3mm on the surfaces of the bonded glass fiber and the graphite film, and rolling to obtain the graphite-based flexible resistance reducing cloth.
The method for the slow-release graphite resistance-reducing paste is further optimized as follows: the rolling parameters in the steps a and d are as follows: the pressure between the rollers is 16-20MPa, and the linear speed is 5-7 m/min.
The application of the slow-release graphite resistance-reducing paste in the grounding device comprises the following steps: the slow-release type resistance reducing paste is coated by a plastic casing, after a fast-assembly grounding electrode is driven into soil, the packaged resistance reducing paste is directly put into a resistance reducing pipe, a resistance reducing paste cutting device is installed at the outlet of the resistance reducing pipe, the plastic casing is lifted upwards, the plastic casing is cut by the cutting device, the resistance reducing paste coated by the plastic casing is dispersed in the resistance reducing pipe of the grounding electrode, sodium sulfate in the resistance reducing paste meets water in the soil to form an ionic solution, and slowly permeates to the periphery of the grounding electrode to form a conductive channel so as to reduce the resistivity of the soil around the grounding electrode.
The application of the slow-release graphite resistance-reducing paste in the grounding device comprises the following steps: in the construction process, the width of the excavated grounding groove is not less than 0.3m, after the grounding groove is leveled to the groove bottom, a layer of slow-release graphite resistance reducing paste is laid at the groove bottom, then a graphite-based flexible grounding body is laid, and a layer of slow-release graphite resistance reducing paste is laid, so that direct contact between a grounding belt and soil is avoided, the flow scattering area is increased, and better conduction and resistance reducing effects are achieved.
The green brick mud strip slitting device has the following beneficial effects:
1. the slow-release graphite resistance-reducing paste is an anhydrous resistance-reducing paste, when a grounding body is buried in soil, the resistance-reducing paste is wrapped around the grounding body, and bentonite in the components is combined with water to form sticky particles, so that the grounding body can be tightly wrapped, and the contact area and the diffusion area of the grounding body and the soil are increased;
2. the slow-release graphite resistance-reducing paste takes graphite-based flexible resistance-reducing cloth as a main material, has good conductivity, impact current tolerance, strong adsorbability and self-lubricity, has a stable structure under heavy current impact, has the advantages of reliable corrosion resistance, long service life, no pollution to soil and the like, has unchanged physical and chemical properties after the resistance-reducing cloth is crushed and ground, and retains the original high conductivity and high corrosion resistance characteristics, during the preparation process, the density of the flexible graphite is greatly improved after the flexible graphite is subjected to high-pressure rolling, the higher the density of the flexible graphite is, the better the conductivity is, complete conductive channels can be formed among particles although the physical structure is damaged, compared with the scale graphite which is not processed, the conductivity is good, the affinity of the particle structure to the soil is higher, and the resistivity of the soil around the earth pole is favorably reduced, the grounding resistance of the power transmission line is better reduced;
3. the slow-release graphite resistance-reducing paste is added with the vegetable oil, and the vegetable oil belongs to macromolecules, so that the fluidity of a mixture can be improved, and meanwhile, the soil is not polluted;
4. the slow-release graphite resistance-reducing paste is added with sodium sulfate, the sodium sulfate has strong high water absorption and water retention, the contact resistance between the sodium sulfate and soil and the flow diffusion resistance of diffusion flow to the soil are reduced, and the sodium sulfate is easily dissolved in water to form a conductive channel, so that the resistivity of the soil around a grounding body is favorably reduced;
5. the graphite-based flexible resistance reducing cloth or particles obtained by crushing leftover materials in the preparation process of the graphite-based flexible resistance reducing cloth is added into the slow-release graphite resistance reducing paste, and the graphite-based flexible resistance reducing cloth is made of the 8099-grade and 180-grade expandable graphite, so that the conductivity of the whole slow-release graphite resistance reducing paste can be improved;
6. the slow-release graphite resistance-reducing paste can be coated by a plastic casing and then placed into a resistance-reducing tube of a fast-assembly grounding electrode, after the plastic casing is stripped, the resistance-reducing paste is dispersed in the resistance-reducing tube of the grounding electrode, sodium sulfate in the resistance-reducing paste meets water in soil to form an ionic solution, and the ionic solution slowly permeates to the periphery of the grounding electrode to form a conductive channel, so that the resistivity of the soil around the grounding electrode can be greatly reduced;
6. the slow-release graphite resistance-reducing paste can be matched with a flexible graphite grounding material for use, so that better conducting and resistance-reducing effects are achieved.
Drawings
FIG. 1 is a schematic structural view of the graphite resistance-reducing paste of the present invention after wrapping a plastic casing;
FIG. 2 is a schematic view of the internal structure of a ground electrode filled with the graphite resistance-reducing paste of the present invention;
FIG. 3 is a schematic structural view of the slitting device;
FIG. 4 is a schematic view of the installation of the graphite resistance-reducing paste of the present invention in cooperation with a flexible graphite grounding material;
FIG. 5 is a schematic view of the external structure of an edge runner mill used in the preparation process of the graphite resistance-reducing paste according to the present invention;
FIG. 6 is a schematic view of the internal structure of an edge runner mill used in the preparation process of the graphite resistance-reducing paste of the present invention;
FIG. 7 is a schematic structural diagram of a coal rod machine used in the preparation process of the graphite resistance-reducing paste of the present invention;
the labels in the figure are: 1. the device comprises a plastic casing, 2 parts of graphite resistance reducing paste, 3 parts of spear tips, 4 parts of steel spears, 5 parts of aluminum pipes, 6 parts of supporting core rods, 7 parts of overflow holes, 8 parts of resistance reducing pipes, 9 parts of silicon rubber pipes, 10 parts of blades, 11 parts of graphite-based flexible grounding bodies, 12 parts of motors, 13 parts of speed reducers, 14 parts of cross couplers, 15 parts of bearing boxes, 16 parts of feed hoppers, 17 parts of discharge pipes, 18 parts of wheel grinding bins, 19 parts of main shafts, 20 parts of reinforcing connecting plates, 21 parts of reinforcing connecting rods, 22 parts of grinding wheels, 23 parts of material pushing plates, 24 parts of discharge chutes.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The technical solution of the present invention is further described below with reference to specific embodiments.
Example 1
The slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 30% of graphite-based flexible resistance-reducing cloth particles, 25% of bentonite, 15% of anhydrous sodium sulfate particles and 30% of vegetable oil.
The graphite-based flexible resistance reducing cloth is prepared by crushing graphite-based flexible resistance reducing cloth, the graphite-based flexible resistance reducing cloth is prepared by compounding expandable graphite and glass fiber, the particle size of the expandable graphite is 80 meshes, the carbon content is more than or equal to 99 percent, the expansion volume is 180mL/g, and the vegetable oil is soybean oil.
Example 2
The slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 40% of graphite-based flexible resistance-reducing cloth particles, 20% of bentonite, 10% of anhydrous sodium sulfate particles and 30% of vegetable oil.
The graphite-based flexible resistance reducing cloth is prepared by crushing graphite-based flexible resistance reducing cloth, the graphite-based flexible resistance reducing cloth is prepared by compounding expandable graphite and glass fiber, the particle size of the expandable graphite is 80 meshes, the carbon content is more than or equal to 99 percent, the expansion volume is 180mL/g, and the vegetable oil is corn oil.
Example 3
The slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 35% of graphite-based flexible resistance-reducing cloth particles, 25% of bentonite, 15% of anhydrous sodium sulfate particles and 25% of vegetable oil.
The graphite-based flexible resistance reducing cloth is prepared by crushing graphite-based flexible resistance reducing cloth, the graphite-based flexible resistance reducing cloth is prepared by compounding expandable graphite and glass fiber, the particle size of the expandable graphite is 80 meshes, the carbon content is more than or equal to 99%, the expansion volume is 180mL/g, and the vegetable oil is palm oil.
Example 4
A method for preparing a slow-release graphite resistance-reducing paste comprises the following steps:
s1, setting the temperature of the puffing furnace to be 900 ℃, feeding the expandable graphite into the puffing furnace at a feeding speed of 2.0kg/min after the temperature of the puffing furnace reaches 900 ℃, forming expanded graphite worms after high-temperature puffing in the puffing furnace for 15S, then feeding the expanded graphite worms into a pre-pressing device, and grinding the expanded graphite worms into particles with the thickness of 0.3mm and the density of 0.3g/cm3The rolling parameters of the pre-pressing process are as follows: the pressure between the rollers is 18MPa, and the linear speed is 6 m/min;
s2, paving glass fibers on the surface of the graphite film at intervals, and coating a solid glue doped with a penetrating agent on the surface of the glass fibers, which is in contact with the graphite film;
s3, compounding the glass fiber and the graphite film and transmitting the compounded glass fiber and graphite film to drying equipment, so that the penetrant fully permeates into the glass fiber and the graphite film to be bonded;
s4, paving a layer of expanded graphite worms with the thickness of 3mm on the surfaces of the bonded glass fiber and graphite film, and rolling to obtain the graphite-based flexible resistance reducing cloth, wherein the rolling parameters are as follows: the pressure between the rollers is 18MPa, and the linear speed is 6 m/min.
S5, taking graphite-based flexible resistance reducing cloth, and crushing the graphite-based flexible resistance reducing cloth by using a crusher to obtain graphite-based flexible resistance reducing cloth particles;
s6, taking the raw materials according to the proportion in the embodiment 1 for later use;
s7, pre-mixing the graphite-based flexible resistance-reducing cloth particles and bentonite in a mixing barrel, uniformly mixing, putting the obtained mixture into a colloid mill, grinding and stirring, adding vegetable oil and a sodium sulfate solution, fully grinding and stirring to obtain the slow-release graphite resistance-reducing paste.
The mixing of the graphite-based flexible resistance-reducing cloth particles and the bentonite is carried out in an edge runner mill, the structure of the edge runner mill is shown in figures 5 and 6, and the edge runner mill mainly comprises the following components: wheel storehouse 18, main shaft 19, reinforcement connecting plate 20, reinforcement connecting rod 21, grinding wheel 22, scraping wings 23 and blown down tank 24, graphite base flexibility is fallen and is hindered cloth granule and bentonite and add the wheel storehouse 18 by the wheel storehouse 18 top in, through the combined action of grinding wheel 22 and scraping wings 23, carries out premix processing to the material, and the material after the mixture is discharged by blown down tank 24, gets into next process.
Example 5
A method for preparing a slow-release graphite resistance-reducing paste comprises the following steps:
s1, setting the temperature of the expansion furnace to be 900 ℃, feeding the expandable graphite into the expansion furnace at a feeding speed of 1.8kg/min after the temperature of the expansion furnace reaches 900 ℃, forming expanded graphite worms after high-temperature expansion for 18S in the expansion furnace, feeding the expanded graphite worms into a pre-pressing device, and grinding the expanded graphite worms into particles with the thickness of 0.3mm and the density of 0.3g/cm3The rolling parameters of the pre-pressing process are as follows: the pressure between the rollers is 16MPa, and the linear speed is 7 m/min;
s2, paving glass fibers on the surface of the graphite film at intervals, and coating a solid glue doped with a penetrating agent on the surface of the glass fibers, which is in contact with the graphite film;
s3, compounding the glass fiber and the graphite film and transmitting the compounded glass fiber and graphite film to drying equipment, so that the penetrant fully permeates into the glass fiber and the graphite film to be bonded;
s4, paving a layer of expanded graphite worms with the thickness of 3mm on the surfaces of the bonded glass fiber and graphite film, and rolling to obtain the graphite-based flexible resistance reducing cloth, wherein the rolling parameters are as follows: the pressure between the rollers is 20MPa, and the linear speed is 5 m/min.
S5, taking graphite-based flexible resistance reducing cloth, and crushing the graphite-based flexible resistance reducing cloth by using a crusher to obtain graphite-based flexible resistance reducing cloth particles;
s6, taking the raw materials according to the proportion in the embodiment 2 for later use;
s7, pre-mixing the graphite-based flexible resistance-reducing cloth particles and bentonite in a mixing barrel, uniformly mixing, putting the obtained mixture into a colloid mill, grinding and stirring, adding vegetable oil and a sodium sulfate solution, fully grinding and stirring to obtain the slow-release graphite resistance-reducing paste.
Example 6
A method for preparing a slow-release graphite resistance-reducing paste comprises the following steps:
s1, setting the temperature of the expansion furnace to be 900 ℃, feeding expandable graphite into the expansion furnace at a feeding speed of 2.2kg/min after the temperature of the expansion furnace reaches 900 ℃, forming expanded graphite worms after high-temperature expansion for 12S in the expansion furnace, feeding the expanded graphite worms into a pre-pressing device, and grinding the expanded graphite worms into particles with the thickness of 0.5mm and the density of 0.2g/cm3The rolling parameters of the pre-pressing process are as follows: the pressure between the rollers is 20MPa, and the linear speed is 5 m/min;
s2, paving glass fibers on the surface of the graphite film at intervals, and coating a solid glue doped with a penetrating agent on the surface of the glass fibers, which is in contact with the graphite film;
s3, compounding the glass fiber and the graphite film and transmitting the compounded glass fiber and graphite film to drying equipment, so that the penetrant fully permeates into the glass fiber and the graphite film to be bonded;
s4, paving a layer of expanded graphite worms with the thickness of 3mm on the surfaces of the bonded glass fiber and graphite film, and rolling to obtain the graphite-based flexible resistance reducing cloth, wherein the rolling parameters are as follows: the pressure between the rollers is 16MPa, and the linear speed is 7 m/min.
S5, taking graphite-based flexible resistance reducing cloth, and crushing the graphite-based flexible resistance reducing cloth by using a crusher to obtain graphite-based flexible resistance reducing cloth particles;
s6, taking the raw materials according to the proportion in the embodiment 3 for later use;
s7, pre-mixing the graphite-based flexible resistance-reducing cloth particles and bentonite in a mixing barrel, uniformly mixing, putting the obtained mixture into a colloid mill, grinding and stirring, adding vegetable oil and a sodium sulfate solution, fully grinding and stirring to obtain the slow-release graphite resistance-reducing paste.
Example 7
The application of the slow-release graphite resistance-reducing paste in the grounding device specifically comprises the following steps: as shown in fig. 1, a slow-release type resistance reducing paste 2 is coated by a plastic casing 1, after a quick-assembly grounding electrode is driven into soil (the quick-assembly grounding electrode comprises a spear tip 3, a steel spear 4, an aluminum pipe 5, a supporting core rod 6, an overflow hole 7, a resistance reducing pipe 8 and other parts), the coated resistance reducing paste is directly put into the resistance reducing pipe 8 (as shown in fig. 3), a resistance reducing paste cutting device is arranged at the outlet of the resistance reducing pipe 8, the plastic casing 1 is lifted upwards, the plastic casing 1 is cut by the cutting device, the resistance reducing paste 2 coated by the plastic casing 1 is dispersed in the resistance reducing pipe 8 of the grounding electrode, sodium sulfate in the resistance reducing paste 2 meets moisture in the soil to form an ionic solution, and slowly permeates to the periphery of the grounding electrode to form a conductive channel so as to reduce the resistivity of the soil around the grounding electrode. As shown in fig. 2, the used resistance reducing paste slitting device is composed of a silicon rubber tube 9 and blades 10, four blades 10 are uniformly distributed on the inner wall of a tube opening at one end of the silicon rubber tube 9 along the circumferential direction, after packaged resistance reducing paste is placed in the resistance reducing tube 8, the silicon rubber tube 9 is sleeved at the tail end port of the resistance reducing tube 8, then the plastic casing 1 is lifted outwards, in the lifting process, the casing is cut by the blades 10, and the resistance reducing paste 2 is dispersed in the grounding electrode resistance reducing tube 8.
Wherein, the casing 1 is wrapped outside the slow-release type resistance-reducing paste 2 and is processed by a coal rod machine, the structure of the coal rod machine is shown in figure 7, and the coal rod machine mainly comprises the following components: motor 12, speed reducer 13, cross coupling 14, bearing box 15, feed hopper 16 and discharging pipe 17.
Example 8
The application of the slow-release graphite resistance-reducing paste in the grounding device specifically comprises the following steps: as shown in fig. 4, in the construction process, the width of the excavated grounding groove is not less than 0.3m, after the grounding groove is leveled to the groove bottom, a layer of slow-release graphite resistance-reducing paste 2 is laid at the groove bottom, then the graphite-based flexible grounding body 11 is laid, and a layer of slow-release graphite resistance-reducing paste 2 is laid, so that direct contact between a grounding belt and soil is avoided, the flow-dispersing area is increased, and better conducting and resistance-reducing effects are achieved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. A method for preparing slow-release graphite resistance-reducing paste is disclosed, wherein the slow-release graphite resistance-reducing paste is prepared from the following raw materials in parts by weight: 30% -40% of graphite-based flexible resistance-reducing cloth particles, 20% -25% of bentonite, 10% -15% of sodium sulfate and 25% -30% of vegetable oil, and is characterized in that: the method comprises the following steps:
s1, taking graphite-based flexible resistance reducing cloth, and crushing the graphite-based flexible resistance reducing cloth by using a crusher to obtain graphite-based flexible resistance reducing cloth particles;
s2, taking the raw materials in proportion for later use;
s3, pre-mixing the graphite-based flexible resistance-reducing cloth particles and bentonite in a mixing barrel, uniformly mixing, putting the obtained mixture into a colloid mill, grinding and stirring, adding vegetable oil and a sodium sulfate solution, fully grinding and stirring to obtain the slow-release graphite resistance-reducing paste.
2. The method for preparing the slow-release graphite resistance-reducing paste according to claim 1, which is characterized by comprising the following steps of: the vegetable oil is one or any mixture of soybean oil, rapeseed oil, peanut oil, corn oil, sunflower seed oil, palm oil, tea seed oil, olive oil, rice bran oil, sesame oil and safflower seed oil.
3. The method for preparing the slow-release graphite resistance-reducing paste according to claim 1, which is characterized by comprising the following steps of: the sodium sulfate is powder anhydrous sodium sulfate particles.
4. The method for preparing the slow-release graphite resistance-reducing paste according to claim 1, which is characterized by comprising the following steps of: the graphite-based flexible resistance reducing cloth particles are obtained by crushing graphite-based flexible resistance reducing cloth, and the graphite-based flexible resistance reducing cloth is prepared by compounding expandable graphite and glass fibers.
5. The method for preparing the slow-release graphite resistance-reducing paste according to claim 4, which is characterized by comprising the following steps of: the particle size of the expandable graphite is 80 meshes, the carbon content is more than or equal to 99 percent, and the expansion volume is 180 mL/g.
6. The method for preparing the slow-release graphite resistance-reducing paste according to claim 1, which is characterized by comprising the following steps of: the preparation method of the graphite-based flexible resistance reducing cloth in the S1 comprises the following steps:
a. setting the temperature of the puffing furnace to 900 deg.C, feeding the expandable graphite into the puffing furnace at a feeding speed of 1.8-2.2kg/min when the temperature of the puffing furnace reaches 900 deg.C, puffing at high temperature in the puffing furnace for 12-18s to form expanded graphite worms, feeding the expanded graphite worms into a pre-pressing device, and grinding the expanded graphite worms into granules with a thickness of 0.3-0.5mm and a density of 0.2-0.3g/cm3The graphite film of (3);
b. spreading glass fibers on the surface of a graphite film at intervals, and coating a solid glue doped with a penetrating agent on the surface of the glass fibers, which is in contact with the graphite film;
c. compounding the glass fiber and the graphite film and transmitting the glass fiber and the graphite film to drying equipment together to ensure that the penetrant fully permeates into the glass fiber and the graphite film to be bonded;
d. and paving a layer of expanded graphite worms with the thickness of 3mm on the surfaces of the bonded glass fiber and the graphite film, and rolling to obtain the graphite-based flexible resistance reducing cloth.
7. The method for preparing the slow-release graphite resistance-reducing paste according to claim 6, which is characterized by comprising the following steps of: the rolling parameters in a and d are as follows: the pressure between the rollers is 16-20MPa, and the linear speed is 5-7 m/min.
8. The application of the slow-release graphite resistance-reducing paste prepared by the method according to claim 1 in a grounding device is characterized in that: the slow-release type resistance reducing paste is coated by a plastic casing, after a fast-assembly grounding electrode is driven into soil, the packaged resistance reducing paste is directly put into a resistance reducing pipe, a resistance reducing paste cutting device is installed at the outlet of the resistance reducing pipe, the plastic casing is lifted upwards, the plastic casing is cut by the cutting device, the resistance reducing paste coated by the plastic casing is dispersed in the resistance reducing pipe of the grounding electrode, sodium sulfate in the resistance reducing paste meets water in the soil to form an ionic solution, and slowly permeates to the periphery of the grounding electrode to form a conductive channel so as to reduce the resistivity of the soil around the grounding electrode.
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| CN208315786U (en) * | 2018-06-20 | 2019-01-01 | 河南四达电力设备股份有限公司 | A kind of ready-package soft graphite ion grounding electrode |
| CN109273872A (en) * | 2018-10-12 | 2019-01-25 | 河南四达电力设备股份有限公司 | A kind of graphite-based flexibility drop resistance cloth and its production method for the laying of soft graphite counterpoise grounding |
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| CN2672896Y (en) * | 2003-12-08 | 2005-01-19 | 杨少林 | Earth electric drainage device |
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| CN104810631A (en) * | 2015-04-23 | 2015-07-29 | 国家电网公司 | Ground connection resistance reduction composite padding for acid red soil |
| CN208315786U (en) * | 2018-06-20 | 2019-01-01 | 河南四达电力设备股份有限公司 | A kind of ready-package soft graphite ion grounding electrode |
| CN109273872A (en) * | 2018-10-12 | 2019-01-25 | 河南四达电力设备股份有限公司 | A kind of graphite-based flexibility drop resistance cloth and its production method for the laying of soft graphite counterpoise grounding |
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| CN111326272A (en) | 2020-06-23 |
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