CN116656195A - Long-acting protection material for diversified grounding monitoring parts of power distribution system - Google Patents
Long-acting protection material for diversified grounding monitoring parts of power distribution system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/63—Additives non-macromolecular organic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/65—Additives macromolecular
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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Abstract
The invention provides a long-acting protective material for a diversified grounding monitoring part of a power distribution system, and belongs to the technical field of protective materials. The long-acting protective material for the diversified grounding monitoring parts of the power distribution system comprises the following preparation raw materials in parts by weight: 100 parts of organosilicon modified water-soluble acrylic resin, 8-12 parts of polyvinyl alcohol, 15-25 parts of graphite phase carbon nitride nano-sheets, 1-7 parts of carbon nano-tubes, 2-8 parts of polydopamine, 0.5-3 parts of surfactant, 10-20 parts of curing agent and 12-21 parts of solvent. The protective material of the present invention is used for coating to achieve long-term protection of the diversified grounding monitoring components to cope with the more complex demands faced by the current diversified grounding monitoring.
Description
Technical Field
The invention belongs to the technical field of protective materials, and particularly relates to a long-acting protective material for a diversified grounding monitoring part of a power distribution system.
Background
The current high-proportion new energy and power electronic equipment are widely accessed, and the power grid presents a novel characteristic of strong and weak current, alternating current and direct current complex series-parallel connection. Especially, in the application of power electronic devices in large scale, the ground current mainly comprising equipment leakage current, induced current, soil stray current and loop current can show diversified characteristics. The construction of the novel power system can enlarge the scale of the original power system, so that the ground current level of the whole system can be correspondingly improved.
The novel power system has a huge system framework, covers areas with high soil resistivity, high salinity areas, strong acid and strong alkali, coastal strong corrosion and the like, and provides higher requirements for the corrosion resistance of the grounding material. Meanwhile, as the power grid scale in the novel power system increases, the amplitude of fault current entering the ground also increases, and the electrical performance requirement on the grounding device is also higher and higher.
As the voltage class, the transmission capacity and the system scale of the power transmission line are increased, the fault current of the power system to the ground is correspondingly increased, so that the requirement on the stability of the grounding device is also higher. Besides the traditional galvanized steel as a main application material, copper-clad steel, stainless steel, graphite-based flexible grounding materials and the like enter the grounding market in a dispute, and occupy an important share in technical improvement projects. However, with the development and application of the novel power system, the performance requirements of the grounding material are more severe, and particularly the corrosion resistance reduction performance of the grounding device is improved. As geological structures and geographical environments become more and more complex, the overall operating environment presents a serious challenge to the corrosion and drag reduction effects of the ground-engaging materials. Therefore, developing high-efficiency grounding resistance-reducing corrosion-preventing technology and materials has important significance for providing more comprehensive technical support for the design, operation and maintenance of the grounding technology under the novel power system.
Graphite phase carbon nitride (g-C) 3 N 4 ) Is a novel carbon-based inorganic material, and has been receiving extensive attention from researchers since 2012 due to its inherent high light absorption and light responsiveness, semiconductor characteristics, physiological stability and good biocompatibility. The prior research shows that the graphite phase carbon nitride also has good anti-corrosion and anti-fouling properties when used in the paint. For example, patent document CN115216201a provides an anticorrosive paint with photocatalytic antibacterial effect, comprising an epoxy resin, an epoxy resin modifier, a multifunctional rheology auxiliary agent, a curing agent and an organic-inorganic hybrid modified g-C 3 N 4 Nanoplatelets, organic-inorganic hybrid modified g-C 3 N 4 The nano-sheet is composed of g-C 3 N 4 The nano-sheet surface is coated with polydopamine and then is subjected to surface modification by a composite coupling agent; the g-C 3 N 4 NanosheetsBulk-C of Bulk phase graphite phase carbon nitride 3 N 4 Stripping to obtain the product; the preparation method comprises the following steps: s1, adding epoxy resin, polyvinyl butyral resin, a multifunctional rheological additive and a mixed solvent into a high-speed dispersing machine, uniformly dispersing at high speed, and then adding pigment and filler and organic-inorganic hybrid modified g-C 3 N 4 And continuously dispersing the nano-sheets at a high speed, and preparing the solution A after the dispersion is completed. S2, carrying out high-speed dispersion on the cardanol modified amine adduct and the tackifier, and obtaining the solution B after the dispersion is completed. And S3, mixing the solution A and the solution B to obtain the anti-corrosion coating with the photocatalysis antibacterial effect. Through inspection, the paint can realize the requirements of paint corrosion prevention and pollution prevention integration, solves the problem of poor coating effect of nano photocatalytic filler in paint, effectively improves the photocatalytic pollution prevention and corrosion prevention performance of the paint, reduces the paint cost, has wide applicability to different substrates, has good compatibility and strong universality, and improves the shipbuilding coating efficiency and benefit; and can be widely used for long-acting anticorrosive paint for offshore facilities, bridges, pipelines, storage cabinets, steel structures and the like, and has wide application range. However, the coating is used for the grounding protection material, and has some defects, and the performances of the grounding material in the aspects of conductivity, corrosion resistance and the like cannot be effectively ensured.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a long-acting protection material for a diversified grounding monitoring component of a power distribution system.
In order to solve the technical problems, the invention adopts the following technical scheme: the long-acting protective material for the diversified grounding monitoring parts of the power distribution system comprises the following preparation raw materials in parts by weight: 100 parts of organosilicon modified water-soluble acrylic resin, 8-12 parts of polyvinyl alcohol, 15-25 parts of graphite phase carbon nitride nano-sheets, 1-7 parts of carbon nano-tubes, 2-8 parts of polydopamine, 0.5-3 parts of surfactant, 10-20 parts of curing agent and 12-21 parts of solvent.
Preferably, the surfactant is at least two of a coupling agent, a wetting agent, a dispersing agent, and an adhesion promoter.
The nano material treated by the surfactant has obviously reduced aggregated particle diameter, improves the fluidity of a system, and greatly improves the processing performance, gloss, vividness, adhesive force and other apparent mass properties of the product. Moreover, the surfactants of different types have different effects, and the scientific mixed use can make up for the deficiencies of each other, so that a more remarkable expected effect is achieved.
Preferably, the solvent is at least one of methanol, isopropanol, ethylene glycol and triethylamine.
The invention also provides a preparation method of the long-acting protection material for the diversified grounding monitoring part of the power distribution system, which comprises the following steps:
the following raw materials are provided: the preparation method comprises the following steps of modifying water-soluble acrylic resin, polyvinyl alcohol resin, graphite phase carbon nitride nano-sheets, carbon nano-tubes, polydopamine, a surfactant, a curing agent and a solvent by organic silicon;
slowly adding graphite-phase carbon nitride nano-sheets into a polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a first mixed solution; adding the carbon nano tube into the first solvent, and fully stirring to obtain a second mixed solution; slowly adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; heating and refluxing the third mixed solution at constant temperature, introducing circulating cooling water to maintain the temperature constant, naturally cooling to room temperature after the reaction is finished, washing with deionized water and ethanol for multiple times, drying, grinding and sieving to obtain a composite material;
mixing the composite material with polydopamine, a surfactant and a second solvent, uniformly stirring, and carrying out ultrasonic treatment; and finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain the protective material.
Preferably, the concentration of the polyvinyl alcohol solution is 8-12mg/L;
the first solvent is methanol;
the second solvent is at least one of isopropanol, glycol and triethylamine;
the mass ratio of the first solvent to the second solvent is 1:2.
preferably, the ultrasonic treatment is carried out for 4-6 hours with power of 500-600W.
Preferably, the technological parameters of constant temperature heating reflux include: the temperature is 72-75 ℃ and the time is 15-24 hours.
According to the invention, the graphite phase carbon nitride and the carbon nano tube are compounded by the method, so that the two nano particles can be more uniformly dispersed in the resin matrix, and the agglomeration of the nano particles is inhibited, thereby fully playing the self-advantage characteristic of the nano material and obviously enhancing the conductivity and corrosion resistance of the resin.
The graphite phase carbon nitride has the characteristics of proper band gap, good oxidizing ability, excellent photochemistry, thermal stability and the like. The carbon nitride consists of an alpha phase, a beta phase, a cubic phase, a quasi-cubic phase and a graphite-like structure, and the band gap widths of the carbon nitride are 5.49, 4.85, 4.13, 4.30 and 2.7eV respectively. Among them, graphite-like carbon nitride has been widely used in various photocatalytic fields due to its own band gap width and adjustable band structure. The graphite-phase carbon nitride has a two-dimensional layered structure resembling a graphite stack, and it has been demonstrated that it is possible to form two different polymeric structures as the basic building blocks of each sheet, which are connected by terminal N atoms to form infinitely extensive planes. The existing graphite-phase carbon nitride nanomaterial comprises two types of s-triazine units and 3-s-triazine units, wherein the graphite-phase carbon nitride nanomaterial based on the 3-s-triazine units is more stable and becomes a graphite-phase carbon nitride nanomaterial which is relatively more studied at present.
Zuo et al (Zuo S, chen Y, liu W, et al Polyaniline/g-C) 3 N 4 composites as novel media for anticorrosion coatings[J]Journal of Coatings Technology and Research,2017, 14:1307-1314.) PANI/g-C prepared by a chemical oxidative polymerization process 3 N 4 The nanocomposite coating exhibits excellent permeation resistance and corrosion inhibition properties in salt solutions. Madhan Kumar et al (Madhan Kumar A, yusuf Khan M, suleiman R K, et al Promising graphitic carbon nitride/MoO) x nanocomposites: For surface protective performance of AA2024 alloys in marine environment [J]Surface and Coatings Technology,2019, 374:579-590.) molybdenum oxide (MoO) was used x ) Modified g-C 3 N 4 In g-C 3 N 4 Layered surfaceSupported rod MoO x The nanoparticles are then homogeneously dispersed into the epoxy resin. Adding g-C 3 N 4 /MoO x After the nano particles, the surface protection and corrosion resistance of the coating are obviously enhanced, the penetration of external electrolyte, the degradation and layering of the coating are prevented, and the adhesive capability of the coating on an aluminum substrate is not influenced. Therefore, the graphite phase carbon nitride and specific components are compounded to play a role in enhancing the performances of corrosion resistance, corrosion inhibition and the like.
Carbon nanotubes play a very important role in various fields of society with their unique properties. The structural properties of the carbon nano tube such as closed end, large length-diameter ratio and the like enable the carbon nano tube to have high strength and Young modulus, for example, under the condition of the same volume, the strength of the carbon nano tube is 100 times that of steel, but the mass of the carbon nano tube is only 1/6 of that of the steel, and particularly, the structure of the carbon nano tube cannot be deformed under the action of high external force; the carbon nano tube has good toughness, and the elastic modulus of the carbon nano tube is comparable to that of diamond and is about 1Tpa at the highest; the specific surface area of the carbon nano tube is also large, so the carbon nano tube has the characteristics of good adsorption performance, interface effect and the like, and is also a good electric and heat conducting material.
The study of carbon nanotubes is currently the most attractive in the field of nanomaterial research, which has a number of advantages: the material has the advantages of high mechanical strength, large specific surface, high conductivity, strong interface effect and the like, and has wide application in various fields of society by virtue of the special mechanical, physical, chemical and other properties. However, carbon nanotubes themselves have strong intermolecular forces and are highly susceptible to agglomeration, which severely affects their ability to uniformly disperse in materials and other solvents, thus resulting in a great limitation in application.
Therefore, in order to solve the problems actually existing, the preparation method realizes the preparation of the grounding protection material by using the product through pretreatment and heating reflux, and has more remarkable electrical conductivity, corrosion resistance, thermal stability and the like compared with the single use of the graphite phase carbon nitride or the carbon nano tube.
Compared with the prior art, the invention has the following beneficial effects:
according to the technical scheme, the long-acting protection material for the diversified grounding monitoring components of the power distribution system is provided, and long-acting protection for the diversified grounding monitoring components is realized by coating the material, so that the more complex requirements of the current diversified grounding monitoring are met.
The invention takes resin as a matrix material, preferably organosilicon modified water-soluble acrylic resin; meanwhile, the added graphite phase carbon nitride and the carbon nano tube are compounded, so that the agglomeration problem in the mixing process is overcome, the dispersion is more uniform, and the conductivity and the corrosion resistance of the composite material are enhanced; experiments show that the two raw materials are better in mixing property with the matrix material after being compounded, and the prepared coating material is more remarkable in appearance and adhesive force. In order to cooperate with the composite material to play a role, the invention also prefers a specific surfactant, and the diameter of aggregated particles is obviously reduced after the surfactant is treated, so that the fluidity of a system is improved, and the apparent mass properties of the product such as processability, gloss, vividness, adhesive force and the like are greatly improved. Moreover, the surfactants of different types have different effects, and the scientific mixed use can make up for the deficiencies of each other, so that a more remarkable expected effect is achieved. The present invention preferably uses at least two of a coupling agent, a wetting agent, a dispersing agent, and an adhesion promoter; more preferably, the wetting agent is used in combination with a dispersing agent; wherein the coupling agent can be one or two of titanate coupling agent and silane coupling agent; the wetting agent can be selected from organosilicon wetting agent MY245, aqueous wetting agent BESM 2411 or alkylphenol ethoxylates surfactant; the dispersant may be chosen from hyperdispersants such as: solplus ™ hyperdispersant, aqueous nanoparticle dispersant MALIALIM ® FA series products; the adhesion promoter may be selected from aqueous systems such as: easyTechGT-2000, model HY-200. According to the invention, by matching the raw materials, two nano materials of graphite phase carbon nitride and carbon nano tube can be more uniformly dispersed in a resin matrix, agglomeration of nano particles is inhibited, and meanwhile, the conductivity and corrosion resistance of the resin are enhanced.
According to the invention, the graphite-phase carbon nitride loaded carbon nano tube is realized through pretreatment and heating reflux, and the grounding protection material is manufactured by utilizing the product, so that the conductivity, the corrosion resistance and the like are more remarkable compared with the method of singly using the graphite-phase carbon nitride or the carbon nano tube. The protective material of the invention can be directly coated on the outer surface of the grounding monitoring component, and the thickness can be selected to be 100-300 micrometers.
Detailed Description
For a better understanding of the present invention, the following examples are set forth to further illustrate the invention, but are not to be construed as limiting the invention. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details.
Unless otherwise indicated, all starting materials are from commercially available products and unless otherwise indicated, they do not contain other components not explicitly indicated except for unavoidable impurities.
The long-acting protective material for the diversified grounding monitoring parts of the power distribution system comprises the following preparation raw materials in parts by weight: 100 parts of organosilicon modified water-soluble acrylic resin, 8-12 parts of polyvinyl alcohol, 15-25 parts of graphite phase carbon nitride nano-sheets, 1-7 parts of carbon nano-tubes, 2-8 parts of polydopamine, 0.5-3 parts of surfactant, 10-20 parts of curing agent and 12-21 parts of solvent.
In some embodiments of the present invention, the performance index of the silicone modified water soluble acrylic resin is as follows: appearance: light yellow transparent viscous liquid, solid contains: (65±2)%, viscosity: 10000-15000cps/25 ℃.
The graphite-phase carbon nitride nanosheets can be prepared by reference to the following documents (Chen Ji, xu Shihong, li. Preparation of graphite-phase carbon nitride nanosheets and their performance studies [ J ]. University of Wuhan university, university of GmbH, 2015,37 (9): 5.).
The surfactant is at least one of a coupling agent, a wetting agent, a dispersing agent and an adhesion promoter;
wherein: the coupling agent can be one or two of titanate coupling agent and silane coupling agent;
the wetting agent can be selected from organosilicon wetting agent MY245, aqueous wetting agent BESM 2411 or alkylphenol ethoxylates surfactant;
the dispersant may be chosen from hyperdispersants such as: solplus ™ hyperdispersant, aqueous nanoparticle dispersant MALIALIM ® FA series products;
the adhesion promoter may be selected from aqueous systems such as: easyTechGT-2000, model HY-200.
The nano material treated by the surfactant has obviously reduced aggregated particle diameter, improves the fluidity of a system, and greatly improves the processing performance, gloss, vividness, adhesive force and other apparent mass properties of the product. Moreover, the surfactants of different types have different effects, and the scientific mixed use can make up for the deficiencies of each other, so that a more remarkable expected effect is achieved.
In some embodiments of the present invention, the curing agent may be selected from tetraisopropyl titanate or isophorone diisocyanate.
The solvent is at least one of methanol, isopropanol, glycol and triethylamine.
The invention also provides a preparation method of the long-acting protection material for the diversified grounding monitoring part of the power distribution system, which comprises the following steps:
the following raw materials are provided: the preparation method comprises the following steps of modifying water-soluble acrylic resin, polyvinyl alcohol resin, graphite phase carbon nitride nano-sheets, carbon nano-tubes, polydopamine, a surfactant, a curing agent and a solvent by organic silicon;
slowly adding graphite-phase carbon nitride nano-sheets into a polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a first mixed solution; adding the carbon nano tube into the first solvent, and fully stirring to obtain a second mixed solution; slowly adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; heating and refluxing the third mixed solution at constant temperature, introducing circulating cooling water to maintain the temperature constant, naturally cooling to room temperature after the reaction is finished, washing with deionized water and ethanol for multiple times, drying, grinding and sieving to obtain a composite material;
mixing the composite material with polydopamine, a surfactant and a second solvent, uniformly stirring, and carrying out ultrasonic treatment; and finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain the protective material.
In some preparation schemes, the concentration of the polyvinyl alcohol solution is 8-12mg/L, preferably 10 mg/L; the first solvent is methanol; the second solvent is at least one of isopropanol, glycol and triethylamine; the mass ratio of the first solvent to the second solvent is 1:2.
in some preparation schemes, the time of ultrasonic treatment is 4-6h, and the power is 500-600W; for example: time 4h, power 600W; time 5h, power 550W; time 6h, power 400W.
In some preparation schemes, the process parameters of constant temperature heating reflux include: the temperature is 72-75 ℃ and the time is 15-24 hours; for example: the temperature is 72 ℃ and the time is 24 hours; the temperature is 73 ℃ and the time is 20 hours; the temperature is 75 ℃ and the time is 15 hours.
Wherein, the times of washing with deionized water and ethanol can be 2 times or 3 times or 4 times.
Examples 1 to 6
TABLE 1 raw material compositions of examples 1-6
Wherein, the curing agent is tetraisopropyl titanate.
TABLE 2 composition of surfactants
Wherein: the coupling agent is selected from titanate coupling agents;
a wetting agent alkylphenol ethoxylate surfactant;
the dispersing agent is Solplus ™ hyperdispersant;
the adhesion promoter is HY-200 type product.
TABLE 3 composition of solvent
Example 7
A preparation method of a long-acting protective material for a diversified grounding monitoring part of a power distribution system comprises the following steps: the starting materials are provided according to tables 1-3, respectively; slowly adding graphite-phase carbon nitride nano-sheets into 10 mg/L polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a first mixed solution; adding the carbon nano tube into the first solvent, and fully stirring to obtain a second mixed solution; slowly adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; heating and refluxing the third mixed solution at constant temperature, introducing circulating cooling water to maintain the temperature constant, naturally cooling to room temperature after the reaction is finished, washing with deionized water and ethanol for 3 times, drying, grinding and sieving to obtain a composite material; mixing the composite material with polydopamine, a surfactant and a second solvent, uniformly stirring, and carrying out ultrasonic treatment; finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain a protective material; wherein:
the ultrasonic treatment time is 5h, and the power is 550W;
the technological parameters of constant temperature heating reflux include: the temperature was 75℃for 21h.
Comparative example 1: the long-acting protective material for the diversified grounding monitoring parts of the power distribution system comprises the following preparation raw materials in parts by weight: 100 parts of organosilicon modified water-soluble acrylic resin, 23 parts of graphite phase carbon nitride nano-sheets, 4 parts of carbon nano-tubes, 2.0 parts of surfactant, 18 parts of curing agent and 12 parts of second solvent. The surfactant, curing agent and solvent were the same as in example 6. The preparation method comprises the following steps: dissolving organosilicon modified water-soluble acrylic resin in a second solvent, adding a surfactant, stirring uniformly, sequentially adding graphite-phase carbon nitride nano-sheets and carbon nano-tubes, stirring uniformly respectively, and performing ultrasonic treatment for 5 hours with power of 550W; and finally adding a curing agent, uniformly stirring, and curing to obtain the protective material.
Comparative example 2: this comparative example differs from example 6 in that: the first solvent and the polyvinyl alcohol are omitted, and the specific preparation method comprises the following steps: dissolving organosilicon modified water-soluble acrylic resin in a second solvent, adding polydopamine and a surfactant, stirring uniformly, sequentially adding graphite-phase carbon nitride nano-sheets and carbon nano-tubes, stirring uniformly respectively, and performing ultrasonic treatment for 5 hours and with power of 550W; and finally adding a curing agent, uniformly stirring, and curing to obtain the protective material.
Comparative example 3: this comparative example differs from example 6 in that: omitting the first solvent and the carbon nano tube, the specific preparation method comprises the following steps: slowly adding the graphite-phase carbon nitride nano-sheet into 10 mg/L polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a mixed solution; mixing the mixed solution with polydopamine, a surfactant and a second solvent, uniformly stirring, and performing ultrasonic treatment; finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain a protective material; wherein: the time of the ultrasonic treatment is 5h, and the power is 550W.
Comparative example 4: this comparative example differs from example 6 in that: the graphene is used for replacing graphite phase carbon nitride nano-sheets, and the specific preparation method comprises the following steps: slowly adding graphene into 10 mg/L polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a first mixed solution; adding the carbon nano tube into the first solvent, and fully stirring to obtain a second mixed solution; slowly adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; heating and refluxing the third mixed solution at constant temperature, introducing circulating cooling water to maintain the temperature constant, naturally cooling to room temperature after the reaction is finished, washing with deionized water and ethanol for 3 times, drying, grinding and sieving to obtain a composite material; mixing the composite material with polydopamine, a surfactant and a second solvent, uniformly stirring, and carrying out ultrasonic treatment; finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain a protective material; wherein: the ultrasonic treatment time is 5h, and the power is 550W; the technological parameters of constant temperature heating reflux include: the temperature was 75℃for 21h.
Comparative example 5: this comparative example differs from example 6 in that: the wetting agent was omitted and the other composition was unchanged, the preparation method being taken into example 7.
Next, the content of the evaluation test will be described. The evaluation test was performed for the following evaluation items.
(1) Corrosion resistance test: selecting typical soil in the Loxoriver region, wherein the organic matter content is less than 2%, the pH is 4.5-5.5, the water content is 15-25 wt%, and the resistivity is less than or equal to 300 Ω & m;
selecting the metal grounding grid sections subjected to the coating treatment in the examples 1-6 and the comparative examples 1-5, wherein the thickness of the coating is 200 micrometers, the burial depth is 0.5m, the temperature is 30 ℃, and performing a soil burial acceleration test for 6 months;
testing the corrosion rate of the metal grounding grid section, wherein the corrosion rate is the material thickness change (mm/a) corresponding to a unit time period according to mass weight reduction calculation of the sample before and after the test; in order to accurately obtain quality weight loss data, after the corrosion test is completed, corrosion products possibly attached to the surface of the sample should be removed. The corrosion rate was calculated as follows:
R corrosionrate =8.76×10 7 ×（M-M 0 ）/（S×T×D），
R corrosionrate -corrosion rate, mm/a; m is M 0 -sample mass before test, g; test mass after M-test, g; s-total area of sample, cm 2 The method comprises the steps of carrying out a first treatment on the surface of the T-test time, h; d-material density, kg/m 3 。
The rating criteria for corrosion rate are shown in the following table:
(2) Conductivity test, units Ω.m: the resistivity of the protective material is directly measured using a resistivity meter.
The test results of the above test are shown below:
from the above test results, it can be seen that: 1) The grounding material has excellent corrosion resistance under a test environment, and the used protective material can meet the corrosion resistance requirement of the grounding material and can obviously slow down the corrosion damage of the grounding material. 2) The protective material has resistivity less than 5 omega m and excellent conductivity, and can be well matched with a grounding material. 3) The test results of the comparative examples show that the raw materials in the protective material are properly used and matched with each other, so that more remarkable anti-corrosion and conductive effects are obtained, and the protective material can be used for long-term protection of the grounding monitoring component.
In addition, it should be understood by those skilled in the art that although many problems exist in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. A long-acting protection material for a diversified grounding monitoring part of a power distribution system is characterized in that: the preparation raw materials comprise the following components in parts by weight: 100 parts of organosilicon modified water-soluble acrylic resin, 8-12 parts of polyvinyl alcohol, 15-25 parts of graphite phase carbon nitride nano-sheets, 1-7 parts of carbon nano-tubes, 2-8 parts of polydopamine, 0.5-3 parts of surfactant, 10-20 parts of curing agent and 12-21 parts of solvent.
2. A power distribution system diversified grounding monitoring component long-term protective material as claimed in claim 1, wherein: the surfactant is at least two of a coupling agent, a wetting agent, a dispersing agent and an adhesion promoter.
3. A power distribution system diversified grounding monitoring component long-term protective material as claimed in claim 1, wherein: the solvent is at least one of methanol, isopropanol, glycol and triethylamine.
4. A method of preparing a long-term protective material for a diversified grounding monitoring component of an electrical distribution system as claimed in any one of claims 1 to 3, wherein: the method comprises the following steps:
the following raw materials are provided: the preparation method comprises the following steps of modifying water-soluble acrylic resin, polyvinyl alcohol resin, graphite phase carbon nitride nano-sheets, carbon nano-tubes, polydopamine, a surfactant, a curing agent and a solvent by organic silicon;
slowly adding graphite-phase carbon nitride nano-sheets into a polyvinyl alcohol solution, uniformly stirring, and performing ultrasonic treatment to obtain a first mixed solution; adding the carbon nano tube into the first solvent, and fully stirring to obtain a second mixed solution; slowly adding the second mixed solution into the first mixed solution, and uniformly stirring to obtain a third mixed solution; heating and refluxing the third mixed solution at constant temperature, introducing circulating cooling water to maintain the temperature constant, naturally cooling to room temperature after the reaction is finished, washing with deionized water and ethanol for multiple times, drying, grinding and sieving to obtain a composite material;
mixing the composite material with polydopamine, a surfactant and a second solvent, uniformly stirring, and carrying out ultrasonic treatment; and finally adding the organosilicon modified water-soluble acrylic resin and the curing agent, mixing, and uniformly stirring to obtain the protective material.
5. The method for preparing the long-acting protective material for the diversified grounding monitoring components of the power distribution system according to claim 4, wherein the method comprises the following steps: the concentration of the polyvinyl alcohol solution is 8-12mg/L.
6. The method for preparing the long-acting protective material for the diversified grounding monitoring components of the power distribution system according to claim 4, wherein the method comprises the following steps: the first solvent is methanol;
the second solvent is at least one of isopropanol, glycol and triethylamine;
the mass ratio of the first solvent to the second solvent is 1:2.
7. the method for preparing the long-acting protective material for the diversified grounding monitoring components of the power distribution system according to claim 4, wherein the method comprises the following steps: the ultrasonic treatment time is 4-6h, and the power is 500-600W.
8. The method for preparing the long-acting protective material for the diversified grounding monitoring components of the power distribution system according to claim 4, wherein the method comprises the following steps: the technological parameters of constant temperature heating reflux comprise: the temperature is 72-75 ℃ and the time is 15-24 hours.
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