CN114085612A - Abradable seal coating material and preparation method thereof - Google Patents
Abradable seal coating material and preparation method thereof Download PDFInfo
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- CN114085612A CN114085612A CN202111489914.5A CN202111489914A CN114085612A CN 114085612 A CN114085612 A CN 114085612A CN 202111489914 A CN202111489914 A CN 202111489914A CN 114085612 A CN114085612 A CN 114085612A
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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
- C09D195/00—Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
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- 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
- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention discloses an abradable seal coating material which is prepared from the following raw materials in parts by weight: 10-40 parts of inorganic nano particles, 50-80 parts of modified asphalt and 10 parts of dispersing agent. The coating material can obtain uniform and compact asphaltene by adding inorganic nano particles into a modified asphalt system, and optimizes the structure of the traditional asphalt coating to obtain a coating substrate with excellent performance. Through the intervention of the inorganic nano-filler, the problem of poor compactness of the asphalt coating can be solved, the micro defects of the asphalt coating are effectively filled, and the problem of gaps in an asphalt system is solved. Meanwhile, when the inorganic nano particles are used for filling asphalt coating materials, the inorganic nano particles play a role in bearing, dispersing and transferring load in polymer materials, have larger interface contact and interaction with asphalt phases, can improve the interface bonding strength and further improve the mechanical properties of the asphalt.
Description
Technical Field
The invention relates to the technical field of protective coatings of fluid mechanical equipment, in particular to an abradable seal coating material and a preparation method thereof.
Background
Fluid machinery refers to machinery which uses fluid as working medium to perform energy conversion, and generally comprises a water turbine, a steam turbine, a gas turbine, an expander, a wind turbine, a pump, a ventilator, a compressor and the like. Fluid machinery is an important component of equipment manufacturing industry, and is widely applied to various fields of national economy and infrastructure construction. The technical bottleneck of domestic fluid mechanical equipment is mainly focused on the large-scale, reliable operation and high efficiency of the equipment. The fluid sealing technology is one of the most critical technologies for reliable and efficient operation of fluid mechanical equipment, is mainly realized by the sealing contact between a sealing element and a blade, and has important significance for safe and efficient operation, energy conservation and environmental protection of the fluid mechanical equipment.
In fluid machinery, a high-flow-rate corrosive medium and hard particles can cause abrasion and corrosion of a fluid sealing surface, so that a gap between a sealing element and a high-speed rotating blade tip is enlarged, loss is increased, unit efficiency is reduced, and in severe cases, the machine must be stopped for maintenance, thereby affecting safety production. Research shows that if the turbine blade clearance of a typical engine is reduced by 0.25mm, the efficiency can be improved by 1%. At present, in order to improve the wear resistance and corrosion resistance of a fluid sealing surface, a wear-resistant coating material can be coated on the surface of a rotating blade, and the coating material has excellent corrosion resistance and wear resistance and can effectively protect the blade from being damaged due to fluid erosion.
In the prior art, the coating on the rotating blade has poor wear resistance and is easy to be scratched. Especially, in the mechanical operation process, the coating can be continuously washed by external particles and high-pressure airflow, meanwhile, the sealing element is easily in frictional contact with the surface of the coating, the surface of the coating can be scraped, the coating falls off, the air passage gap is enlarged, the gas leakage amount is enlarged, the working efficiency of the fluid machine is reduced, and the tip of the blade can be damaged.
For example, the application number is [ CN202110996062.2 ], a preparation method of a phosphated polyaniline-silicon dioxide graft modified graphene/waterborne epoxy-containing silicon resin composite coating relates to a preparation method of a silicon resin composite anticorrosive coating. The preparation method aims to solve the problems of poor dispersibility of modified graphene and polyaniline in high polymer resin, complex process and environmental pollution in the preparation of the conventional composite coating. The method comprises the following steps: silicon dioxide is anchored on the surface of graphene oxide through a covalent bond to prepare a graphene oxide-silicon dioxide composite material, phytic acid is used as a modifier to prepare a phosphated polyaniline-silicon dioxide graft modified graphene composite material, and the phosphated polyaniline-silicon dioxide graft modified graphene composite material is compounded and cured with epoxy group-containing waterborne silicone resin. The invention improves the dispersibility of graphene and polyaniline, improves the hydrophobicity of the composite coating, exerts the synergistic effect of graphene and polyaniline more obviously and improves the corrosion resistance of the water-based coating.
Although the phosphating polyaniline-silicon dioxide graft modified graphene/waterborne epoxy-containing silicon resin composite coating prepared by the method improves the corrosion resistance of the coating, the coating is still poor in wear resistance and easy to scrape and deform by blades, so that the gas path gap is enlarged, the gas leakage rate is enlarged, and the working efficiency of a fluid machine is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides an abradable seal coating material and a preparation method thereof, wherein uniform and compact asphaltene can be obtained by adding inorganic nano particles into a modified asphalt system, and the traditional asphalt coating structure is optimized to obtain a coating substrate with excellent performance.
In order to achieve the purpose, the invention is realized by the following technical scheme: on one hand, the invention provides an abradable seal coating material which is prepared from the following raw materials in parts by weight: 10-40 parts of inorganic nano particles, 50-80 parts of modified asphalt and 10 parts of dispersing agent.
In the invention, the asphalt is a black brown complex mixture consisting of hydrocarbons with different molecular weights and nonmetal derivatives thereof, and is one of high-viscosity organic liquids. As the asphalt has excellent corrosion resistance and good mechanical properties, the asphalt is used as a substrate of a wear-resistant and corrosion-resistant coating material. The asphalt also has certain fluidity and viscosity, and when the asphalt is used in the fluid machine, the asphalt can not fall off under the condition of multiple times of washing and friction, and simultaneously, the blades and the sealing parts of the fluid machine can not be damaged.
However, the asphalt contains more light components and a large number of pores, and other molecules are easily permeated into the asphalt after being soaked and washed for a long time, so that the long-acting and stable corrosion protection effect of the asphalt coating is difficult to maintain, the abrasion resistance of the asphalt is poor, the hardness of the asphalt is weak, and the asphalt coating can be greatly deformed due to long-term washing, so that the gap between the blade and the sealing element is enlarged, and the working efficiency of the fluid machine is reduced.
Therefore, in order to reduce the porosity of the asphalt and improve the mechanical property of the asphalt, the inorganic nano particles are added into the asphalt system, so that a uniform and compact asphalt anti-corrosion coating is obtained, the traditional asphalt coating structure is optimized, the problem of poor compactness of the asphalt coating is solved, the tiny defect of the asphalt coating is effectively filled, and the problem of gaps in the asphalt system is solved. Meanwhile, when the inorganic nano particles are used for filling asphalt coating materials, the inorganic nano particles play a role in bearing, dispersing and transferring load in polymer materials, have larger interface contact and interaction with asphalt phases, can improve the interface bonding strength and further improve the mechanical properties of the asphalt. Meanwhile, the added nano particles have the function of reducing abrasion, so that the abrasion resistance of the coating can be improved.
Silica is an inorganic chemical material. Is ultra-fine nanometer scale and has a plurality of unique properties. The nano silicon powder has the characteristics of high purity, small particle size, uniform distribution and the like. Also has the characteristics of large surface area, high surface activity and low apparent density.
Therefore, in order to improve the performance of the asphalt, the invention selects the inorganic nano particles SiO2As a filler, nano-filler is added into an asphalt system to improve the permeation resistance and the wear resistance of the asphalt system.
Inorganic nanoparticle SiO in the invention2When filled into the asphalt system, SiO2The particles can be uniformly dispersed in an asphalt system, and can form a framework to bear asphalt, so that the asphalt is uniformly and thoroughly distributed in the nanometer of the silica colloidal crystal templateIn the pore canal, asphalt and SiO2The particles can be connected in an embedded manner to form a uniform and stable asphalt coating, and the problem of pores in the asphaltene can be effectively solved.
In order to further improve the corrosion resistance of the coating, the invention also relates to inorganic nano-particle SiO2After the inorganic filler is subjected to hydrophobic modification, the filled coating has good hydrophobic property, so that the coating prepared from the asphalt can effectively prevent water molecules from permeating inwards in the mechanical operation process, and the barrier effect on corrosive environment is superior to that of the traditional anticorrosive coating. Moreover, inspired by the leaf loading effect, the coating surface with hydrophobic property can form an air layer at the interface when contacting with water or other liquid, thereby further preventing the direct contact of the blade and the corrosive environment.
Preferably, the inorganic nanoparticles are hydrophobic modified SiO2。
Preferably, the hydrophobically modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in anhydrous ethanol, dropwise adding octadecyltrichlorosilane, stirring at 70-75 deg.C in water bath for 2-3 hr, centrifuging at 8000rmp/min, repeatedly washing with anhydrous ethanol for 2-3 times, and drying at 80 deg.C for 20-24 hr to obtain hydrophobically modified SiO2。
In addition, the general asphalt has high light component content, and the defects of cracks, holes and the like in an asphalt system cannot be completely solved after coating only by adding the filler. Therefore, the invention carries out modification treatment on the asphalt in order to reduce the content of light components in the asphalt.
Preferably, the modified asphalt is hexagonal boron nitride/SBS composite modified asphalt, and the dispersant comprises at least one of Tween 80 and polyethylene glycol 4000.
Preferably, the preparation method of the hexagonal boron nitride/SBS composite modified asphalt comprises the following steps: mixing a swelling agent with the hexagonal boron nitride nanosheet, drying for 4-5 hours at the constant temperature of 120-plus-material 130 ℃, then adding matrix asphalt and SBS to obtain a mixture, shearing the mixture at the constant temperature of 160-plus-material 170 ℃ for 2-3 hours, cutting for 1-1.5 hours at the constant temperature of 180-plus-material 190 ℃, adding a stabilizing agent after cutting, and finally stirring for 3-3.5 hours at the constant temperature of 170-plus-material 180 ℃ to obtain a modified asphalt sample.
Preferably, the mass ratio of the swelling agent, the hexagonal boron nitride nanosheet, the matrix asphalt, the SBS and the stabilizer is (4-5): 8: 100: (2-3): 2.
preferably, the matrix asphalt is at least one of petroleum asphalt and coal asphalt, the swelling agent is furfural extract oil, and the stabilizer is at least one of butyl rubber, ethylene propylene diene monomer rubber, nitrile rubber and butadiene rubber.
According to the invention, SBS (styrene-butadiene-styrene three-segment co-embedded high polymer) is used for modifying the asphalt, so that the softening point of the asphalt matrix can be effectively improved, but SBS and the asphalt are poor in compatibility, the SBS modified asphalt is high in cost and uneven in system dispersion, and therefore the hexagonal boron nitride and SBS are compounded for modifying the asphalt matrix.
Hexagonal boron nitride melts at about 3000 c under high pressure. Has good electrical insulation, thermal conductivity, corrosion resistance and good lubricity. It has good chemical stability and does not react with water, acid and alkali at normal temperature. The stability of the asphalt coating can be greatly improved by adding the asphalt coating into an asphalt matrix.
After the hexagonal boron nitride is doped into the SBS modified asphalt mixture, the internal composition structure of the mixture is greatly influenced. On one hand, the hexagonal boron nitride can fill part of gaps, so that the void ratio of the mixture is reduced, and the dispersion uniformity of an asphalt system is improved; on the other hand, the method also has influence on the contact mode of materials, and the rigid contact mode of the materials is changed into the rigid-flexible contact mode of the materials-hexagonal boron nitride-materials, so that the strength and the rigidity of the mixture can be reduced, and the mechanical property of the asphalt is effectively improved.
In addition, in the composite modified asphalt of the invention, SBS can absorb the light components of the asphalt to swell, so that a stable network structure is formed between the SBS and the modified asphalt, the light components in the asphalt are adsorbed on the surface of SBS, and form an aggregation group by taking the light components as the core, the aggregation group gradually forms a single interface layer along with the increasing addition of SBS, and the stability of the composite modified asphalt is improved and the softening point is increased just due to the effect of the interface layer.
Therefore, the hexagonal boron nitride/SBS composite modified asphalt has the characteristics of high softening point, low light component content and the like, and can form a protective layer of a compact layer when being coated on the surface of a machine, so that other molecules are prevented from entering the inside of asphaltene, particularly water molecules, the anti-corrosion performance of the coating can be effectively improved, and the service life of the coating is prolonged.
According to the invention, the furfural extract oil is added, so that the dispersibility of SBS and hexagonal boron nitride in the asphalt can be increased, SBS and hexagonal boron nitride can be more fully swelled, and the ageing resistance and stability of the modified asphalt are improved. However, the addition amount of the furfural extract oil cannot be too large, because the softening point of the modified asphalt is gradually reduced along with the increase of the addition amount of the furfural extract oil.
In the invention, the stabilizer can generate active free radicals to perform crosslinking grafting reaction with SBS polymer molecular chains and asphalt active functional groups, so that a stable colloid system is formed by the polymer and the asphalt, and a stable phase interface adsorption layer can be formed between the polymer phase in the modified asphalt and the matrix asphalt phase, so that the surface tension of the phase interface is reduced, the affinity of the modified asphalt is increased, and the adsorption force of the modified asphalt and the fluid machinery is further enhanced.
In addition, in the invention, the hexagonal boron nitride nanosheet is used to replace hexagonal boron nitride powder, because the hexagonal boron nitride nanosheet has good barrier property, high thermal stability and chemical inertness, the hexagonal boron nitride nanosheet has excellent corrosion resistance in the composite material. Meanwhile, due to the steric effect of the hexagonal boron nitride nanosheets, the diffusion channel of the corrosive liquid into the coating becomes curved and long and narrow.
Preferably, the preparation process of the hexagonal boron nitride nanosheet is as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding concentrated H2SO4Stirring uniformly, placing the flask in an ice-water bath, adding potassium permanganate powder, sealing with a sealing film, stirring for 10h to obtain a mixed system, dropwise adding 30 mass concentration into the mixed system% hydrogen peroxide is reacted for 1 hour, the mixed system is transferred to a centrifuge tube, the centrifuge tube is placed in a centrifuge for centrifugation for 15 minutes at the rotating speed of 2500r/min, the supernatant liquid is repeatedly washed by deionized water, the precipitate is obtained by centrifugation until the pH value of the supernatant liquid is neutral, the supernatant liquid is obtained and is filtered in vacuum to a nylon filter membrane, then the powder on the filter membrane is placed in a vacuum drying oven at 50 ℃, and the hexagonal boron nitride nanosheet is obtained after drying for 20 hours.
Preferably, the hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: (90-92): 1: 15.
on the other hand, the invention provides a preparation method of the abradable seal coating material, which comprises the following steps:
s1, mixing, heating and uniformly stirring the modified asphalt and the dispersing agent to obtain a mixed emulsion;
s2, dispersing the inorganic nano particles into the mixed emulsion, and performing ultrasonic dispersion for 10min and uniformly stirring to obtain the coating material.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the abradable seal coating material provided by the invention, the inorganic nanoparticles are added into the modified asphalt system, so that uniform and compact asphaltene can be obtained, and the traditional asphalt coating structure is optimized, so that a coating substrate with excellent performance can be obtained. Through the intervention of the inorganic nano-filler, the problem of poor compactness of the asphalt coating can be solved, the micro defects of the asphalt coating are effectively filled, and the problem of gaps in an asphalt system is solved. Meanwhile, when the inorganic nano particles are used for filling asphalt coating materials, the inorganic nano particles play a role in bearing, dispersing and transferring load in polymer materials, have larger interface contact and interaction with asphalt phases, can improve the interface bonding strength and further improve the mechanical properties of the asphalt.
2. The wearable sealing coating material provided by the invention adopts the hexagonal boron nitride/SBS composite modified asphalt, so that the content of light components in the asphaltene can be effectively reduced, and the mechanical property of the asphaltene is further improved.
Drawings
FIG. 1 is a flow chart of a method of making an abradable seal coating material in an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings.
It is obvious that the drawings in the following description are only some examples of the invention, and it is obvious to a person skilled in the art that other drawings and other embodiments can be obtained from these drawings without inventive effort, and the invention is not limited to this example.
The specific embodiment of the invention is as follows:
example 1
An abradable seal coating material is prepared from the following raw materials in parts by weight: 10 parts of inorganic nano particle hydrophobic modified SiO280 parts of hexagonal boron nitride/SBS composite modified asphalt and 10 parts of Tween 80.
In this example:
the hydrophobic modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in absolute ethyl alcohol, then dropwise adding octadecyltrichlorosilane, stirring for 3h under the condition of 70 ℃ water bath, then centrifuging at the rotating speed of 8000rmp/min, repeatedly washing for 2 times by using absolute ethyl alcohol after centrifuging, and finally drying for 20h at 80 ℃ to obtain the hydrophobically modified SiO2。
The preparation process of the hexagonal boron nitride nanosheet is as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding concentrated H2SO4Uniformly stirring, placing a flask in an ice-water bath, adding potassium permanganate powder, sealing by a sealing film, stirring and reacting for 10 hours to obtain a mixed system, dropwise adding hydrogen peroxide with the mass concentration of 30% into the mixed system, transferring the mixed system into a centrifuge tube after reacting for 1 hour, placing the mixed system in a centrifuge for centrifugation for 15 minutes at the rotating speed of 2500r/min, repeatedly washing the upper liquid by deionized water, centrifuging to obtain a precipitate until the pH value of the upper liquid is neutral, taking the upper clear liquid for vacuum filtration to a nylon filter membrane, and then placing powder on the filter membrane into a vacuum drying oven at 50 DEG CAnd drying for 20 hours to obtain the hexagonal boron nitride nanosheet. The hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: 90: 1: 15.
the preparation method of the hexagonal boron nitride/SBS composite modified asphalt comprises the following steps: mixing furfural extract oil with hexagonal boron nitride nanosheets, drying at the constant temperature of 120 ℃ for 4 hours, adding petroleum asphalt and SBS to obtain a mixture, shearing the mixture at the constant temperature of 160 ℃ for 2 hours, cutting at the constant temperature of 180 ℃ for 1 hour, adding butyl rubber after cutting, and stirring at the constant temperature of 170 ℃ for 3 hours to obtain a modified asphalt sample.
The mass ratio of the furfural extract oil to the hexagonal boron nitride nanosheets to the petroleum asphalt to the SBS to the butyl rubber is 4: 8: 100: 2: 2.
preparing an abradable seal coating material according to the conditions corresponding to the components, comprising the following steps:
s1, mixing, heating and uniformly stirring the hexagonal boron nitride/SBS composite modified asphalt and the Tween 80 to obtain a mixed emulsion;
s2, hydrophobic modification of inorganic nano-particles with SiO2Uniformly dispersing into the mixed emulsion, ultrasonically dispersing for 10min, and uniformly stirring to obtain the coating material.
Example 2
An abradable seal coating material is prepared from the following raw materials in parts by weight: 20 parts of inorganic nano particle hydrophobic modified SiO270 parts of hexagonal boron nitride/SBS composite modified asphalt and 10 parts of Tween 80.
In this example:
the hydrophobic modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in absolute ethyl alcohol, then dropwise adding octadecyltrichlorosilane, stirring for 2h under the condition of 72 ℃ water bath, then centrifuging at the rotating speed of 8000rmp/min, repeatedly washing for 2 times by using absolute ethyl alcohol after centrifuging, and finally drying for 22h at 80 ℃ to obtain the hydrophobically modified SiO2。
The preparation process of the hexagonal boron nitride nanosheet is as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding concentrated H2SO4Uniformly stirring, placing a flask in an ice-water bath, adding potassium permanganate powder, sealing a sealing film, stirring and reacting for 10 hours to obtain a mixed system, dropwise adding hydrogen peroxide with the mass concentration of 30% into the mixed system, transferring the mixed system into a centrifuge tube after reacting for 1 hour, placing the centrifuge tube in a centrifuge for centrifugation for 15 minutes at the rotation speed of 2500r/min, repeatedly washing the upper liquid with deionized water, centrifuging to obtain a precipitate until the pH value of the upper liquid is neutral, taking the upper clear liquid, carrying out vacuum filtration on the upper clear liquid to a nylon filter membrane, then placing powder on the filter membrane into a 50 ℃ vacuum drying box, and drying for 20 hours to obtain the hexagonal boron nitride nanosheet. The hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: 91: 1: 15.
the preparation method of the hexagonal boron nitride/SBS composite modified asphalt comprises the following steps: mixing furfural extract oil with hexagonal boron nitride nanosheets, drying at the constant temperature of 125 ℃ for 4 hours, adding petroleum asphalt and SBS to obtain a mixture, shearing the mixture at the constant temperature of 165 ℃ for 2 hours, cutting at the constant temperature of 185 ℃ for 1.5 hours, adding ethylene propylene diene monomer after cutting, and finally stirring at the constant temperature of 175 ℃ for 3.5 hours to obtain a modified asphalt sample.
The mass ratio of the furfural extract oil to the hexagonal boron nitride nanosheets to the petroleum asphalt to the SBS to the ethylene propylene diene monomer is 5: 8: 100: 2: 2.
preparing an abradable seal coating material according to the conditions corresponding to the components, comprising the following steps:
s1, mixing, heating and uniformly stirring the hexagonal boron nitride/SBS composite modified asphalt and the Tween 80 to obtain a mixed emulsion;
s2, hydrophobic modification of inorganic nano-particles with SiO2Uniformly dispersing into the mixed emulsion, ultrasonically dispersing for 10min, and uniformly stirring to obtain the coating material.
Example 3
An abradable seal coating material is prepared from the following raw materials in parts by weight: 30 parts of inorganic nano particle hydrophobic modified SiO260 parts of hexagonal boron nitride/SBS composite modified asphalt and 10 parts of polyethylene glycol 4000.
In this example:
the hydrophobic modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in absolute ethyl alcohol, then dropwise adding octadecyltrichlorosilane, stirring for 3h under the condition of 74 ℃ water bath, then centrifuging at the rotating speed of 8000rmp/min, repeatedly washing for 3 times by using absolute ethyl alcohol after centrifuging is finished, and finally drying for 24h at 80 ℃ to obtain the hydrophobically modified SiO2。
The preparation process of the hexagonal boron nitride nanosheet is as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding concentrated H2SO4Uniformly stirring, placing a flask in an ice-water bath, adding potassium permanganate powder, sealing a sealing film, stirring and reacting for 10 hours to obtain a mixed system, dropwise adding hydrogen peroxide with the mass concentration of 30% into the mixed system, transferring the mixed system into a centrifuge tube after reacting for 1 hour, placing the centrifuge tube in a centrifuge for centrifugation for 15 minutes at the rotation speed of 2500r/min, repeatedly washing the upper liquid with deionized water, centrifuging to obtain a precipitate until the pH value of the upper liquid is neutral, taking the upper clear liquid, carrying out vacuum filtration on the upper clear liquid to a nylon filter membrane, then placing powder on the filter membrane into a 50 ℃ vacuum drying box, and drying for 20 hours to obtain the hexagonal boron nitride nanosheet. The hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: 92: 1: 15.
the preparation method of the hexagonal boron nitride/SBS composite modified asphalt comprises the following steps: mixing furfural extract oil with hexagonal boron nitride nanosheets, drying at the constant temperature of 130 ℃ for 5 hours, adding coal pitch and SBS to obtain a mixture, shearing the mixture at the constant temperature of 170 ℃ for 3 hours, cutting at the constant temperature of 190 ℃ for 1.5 hours, adding nitrile butadiene rubber after cutting, and stirring at the constant temperature of 180 ℃ for 3.5 hours to obtain a modified asphalt sample.
The mass ratio of the furfural extract oil to the hexagonal boron nitride nanosheets to the coal tar pitch to the SBS to the nitrile butadiene rubber is 5: 8: 100: 3: 2.
preparing an abradable seal coating material according to the conditions corresponding to the components, comprising the following steps:
s1, mixing, heating and uniformly stirring the hexagonal boron nitride/SBS composite modified asphalt and the polyethylene glycol 4000 to obtain a mixed emulsion;
s2, hydrophobic modification of inorganic nano-particles with SiO2Uniformly dispersing into the mixed emulsion, ultrasonically dispersing for 10min, and uniformly stirring to obtain the coating material.
Example 4
An abradable seal coating material is prepared from the following raw materials in parts by weight: 40 parts of inorganic nano particle hydrophobic modified SiO250 parts of hexagonal boron nitride/SBS composite modified asphalt and 10 parts of polyethylene glycol 4000.
In this example:
the hydrophobic modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in absolute ethyl alcohol, then dropwise adding octadecyltrichlorosilane, stirring for 3h under the condition of 75 ℃ water bath, then centrifuging at the rotating speed of 8000rmp/min, repeatedly washing for 3 times by using absolute ethyl alcohol after centrifuging is finished, and finally drying for 24h at 80 ℃ to obtain the hydrophobically modified SiO2。
The preparation process of the hexagonal boron nitride nanosheet is as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding concentrated H2SO4Uniformly stirring, placing a flask in an ice-water bath, adding potassium permanganate powder, sealing a sealing film, stirring and reacting for 10 hours to obtain a mixed system, dropwise adding hydrogen peroxide with the mass concentration of 30% into the mixed system, transferring the mixed system into a centrifuge tube after reacting for 1 hour, placing the centrifuge tube in a centrifuge for centrifugation for 15 minutes at the rotation speed of 2500r/min, repeatedly washing the upper liquid with deionized water, centrifuging to obtain a precipitate until the pH value of the upper liquid is neutral, taking the upper clear liquid, carrying out vacuum filtration on the upper clear liquid to a nylon filter membrane, then placing powder on the filter membrane into a 50 ℃ vacuum drying box, and drying for 20 hours to obtain the hexagonal boron nitride nanosheet. The hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: 92: 1: 15.
the preparation method of the hexagonal boron nitride/SBS composite modified asphalt comprises the following steps: mixing furfural extract oil with hexagonal boron nitride nanosheets, drying at the constant temperature of 130 ℃ for 5 hours, adding coal pitch and SBS to obtain a mixture, shearing the mixture at the constant temperature of 170 ℃ for 3 hours, cutting at the constant temperature of 190 ℃ for 1.5 hours, adding butadiene rubber after cutting, and stirring at the constant temperature of 180 ℃ for 3.5 hours to obtain a modified asphalt sample.
Wherein the mass ratio of the furfural extract oil to the hexagonal boron nitride nanosheets to the coal tar pitch to the SBS to the butadiene rubber is 5: 8: 100: 3: 2.
preparing an abradable seal coating material according to the conditions corresponding to the components, comprising the following steps:
s1, mixing, heating and uniformly stirring the hexagonal boron nitride/SBS composite modified asphalt and the polyethylene glycol 4000 to obtain a mixed emulsion;
s2, hydrophobic modification of inorganic nano-particles with SiO2Uniformly dispersing into the mixed emulsion, ultrasonically dispersing for 10min, and uniformly stirring to obtain the coating material.
Comparative example 1
On the basis of example 1, conventional matrix asphalt is adopted to replace hexagonal boron nitride/SBS composite modified asphalt to serve as the conditions of comparative example 1, and the abradable seal coating material of comparative example 1 is prepared.
Comparative example 2
On the basis of example 1, the coating material was prepared only with modified asphalt without adding inorganic nanoparticles and a dispersant as the conditions of comparative example 2, and the abradable seal coating material of comparative example 2 was prepared.
The abradable seal coating materials prepared in examples 1-4 and comparative examples 1-2 were plasma spray coated to form coatings, and each coating was numbered as in the examples and comparative examples.
In the embodiment of the invention, the plasma spraying is a thermal spraying method which takes rigid plasma arcs as a heat source and takes powder material spraying as a main material. Plasma arcs are short for plasma arcs. Plasma is a conductor in which gas is partially or completely ionized in an ultra-high temperature state to form positive and negative ions (electrons) with equal number and which is electrically neutral as a whole. The arc itself is plasma, but only when it is compressed by thermal contraction effect, self-magnetic compression effect, mechanical compression effect, into a compressed arc with higher temperature, it is called plasma arc, its central temperature can reach 10000-50000 deg.C, so high temperature can make all coating materials be sprayed. The initial values of the plasma spraying parameters are set as follows: 55 standard liters per minute of ionized gas, current 650A, and powder feed amount 0.3g/s (2 rpm).
Test example 1
The coating prepared by plasma spraying is subjected to a liquid nitrogen cold impact experiment, and the specific process is as follows:
taking a coating sample of 20mm multiplied by 10mm, soaking the coating sample in liquid nitrogen for 5 minutes in a way that the coating surface faces downwards, then taking out the coating sample, placing the coating sample at room temperature for 5 minutes, and recording the sample as cold shock-cycle 1; again placed in liquid nitrogen for 5 minutes, removed, and left at room temperature for 5 minutes, recorded as cold shock-cycle 2. The above steps are repeated until defects such as microcracks of the coating can be observed visually, or the cold impact cycle is completed by 10 rounds. The surface appearance of the coating was observed and recorded, and the results are shown in table 1 below.
TABLE 1 Cold impact phenomena on the surface of coatings obtained by plasma spraying of the materials prepared in examples 1-4 and comparative examples 1-2
From the results in table 1, it can be seen that after the materials prepared in examples 1 to 4 were sprayed to form a coating, no crack was observed after 10 cycles of cold shock cycles, and the surface was intact, indicating that the corrosion resistance was excellent and the coating was dense. The coatings prepared in comparative examples 1 and 2 have cracks, which shows that liquid nitrogen enters the coating, the coating has poor compactness, and more gaps exist in the coating system. The reason for this is probably that after the inorganic nano particles are added into the modified asphalt system, uniform and compact asphalt can be obtained, the structure of the traditional asphalt coating is optimized, the problem of poor compactness of the asphalt coating can be solved through the intervention of the inorganic nano filler, the tiny defect of the asphalt coating is effectively filled, and the problem of gaps in the asphalt system is solved.
Test example 2
The bonding strength of the coating prepared by plasma spraying is tested, and the specific process is as follows:
taking coatings with the thickness of 0.3mm and 0.5mm for testing respectively, and according to the determination standard of national standard thermal spraying tensile bonding strength: GB/T8642-2002, the sample is subjected to conventional stretching at room temperature, and the coating bonding strength at room temperature can be calculated according to the stretching test results, and the results are shown in the following table 2.
TABLE 2 coating bond strengths by plasma spraying of materials prepared in examples 1-4 and comparative examples 1-2
As can be seen from the results in Table 2, the materials prepared in sample examples 1-4 were sprayed to produce coatings having significantly better bond strengths than those of sample comparative examples 1-2. The reason is probably that in the composite modified asphalt system, the stabilizer can generate active free radicals which are subjected to cross-linking grafting reaction with SBS polymer molecular chains, hexagonal boron nitride and asphalt active functional groups to form a stable colloid system between the polymer and the asphalt, and a stable phase interface adsorption layer can be formed between the polymer phase and the matrix asphalt phase in the modified asphalt, so that the surface tension of the phase interface is reduced, the affinity of the modified asphalt is increased, and the adsorption force of the modified asphalt and the fluid machinery is further enhanced.
Test example 3
The abradability test of the coating prepared by plasma spraying comprises the following specific steps:
the friction and wear characteristics of the block are determined by the ball-and-disk method, using the international organization for standardization on the standard ISO20808-2016 for friction and wear. The results are shown in Table 3.
TABLE 3 abrasion resistance test results of coatings obtained by plasma spraying of coating materials prepared in examples 1 to 4 and comparative examples 1 to 2
As can be seen from the results in Table 3, the abrasion resistance of the coating made of the material prepared in sample examples 1-4 by spraying is significantly better than that of sample comparative examples 1-2. This is probably because when the inorganic nanoparticles are used to fill asphalt coating materials, they act as load bearing, dispersing and transferring functions in the polymer material, and the interfacial contact and interaction between the inorganic nanoparticles and the asphalt phase is large, which can improve the interfacial bonding strength and further improve the mechanical properties of asphalt.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the specific embodiments of the invention be limited to these descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. An abradable seal coating material is characterized by being prepared from the following raw materials in parts by weight: 10-40 parts of inorganic nano particles, 50-80 parts of modified asphalt and 10 parts of dispersing agent.
2. An abradable as claimed in claim 1The dissipative sealing coating material is characterized in that the inorganic nano particles are hydrophobic modified SiO2。
3. The abradable seal coating material of claim 2, wherein the hydrophobically-modified SiO2The preparation method comprises the following steps: mixing SiO2Dispersing the particles in anhydrous ethanol, dropwise adding octadecyltrichlorosilane, stirring at 70-75 deg.C in water bath for 2-3 hr, centrifuging at 8000rmp/min, repeatedly washing with anhydrous ethanol for 2-3 times, and drying at 80 deg.C for 20-24 hr to obtain hydrophobically modified SiO2。
4. The abradable seal coating material of claim 1, wherein the modified asphalt is hexagonal boron nitride/SBS composite modified asphalt, and the dispersant comprises at least one of Tween 80 and polyethylene glycol 4000.
5. The abradable seal coating material of claim 4, wherein the hexagonal boron nitride/SBS composite modified asphalt is prepared by the following steps: mixing a swelling agent with the hexagonal boron nitride nanosheet, drying for 4-5 hours at the constant temperature of 120-plus-material 130 ℃, then adding matrix asphalt and SBS to obtain a mixture, shearing the mixture at the constant temperature of 160-plus-material 170 ℃ for 2-3 hours, cutting for 1-1.5 hours at the constant temperature of 180-plus-material 190 ℃, adding a stabilizing agent after cutting, and finally stirring for 3-3.5 hours at the constant temperature of 170-plus-material 180 ℃ to obtain a modified asphalt sample.
6. The abradable seal coating material of claim 5, wherein the mass ratio of the swelling agent, hexagonal boron nitride nanosheets, matrix asphalt, SBS, and stabilizer is (4-5): 8: 100: (2-3): 2.
7. the abradable seal coating material of claim 5, wherein the hexagonal boron nitride nanosheets are prepared as follows: putting hexagonal boron nitride powder into a 500mL single-neck flask, and adding the concentrateH2SO4Uniformly stirring, placing a flask in an ice-water bath, adding potassium permanganate powder, sealing a sealing film, stirring and reacting for 10 hours to obtain a mixed system, dropwise adding hydrogen peroxide with the mass concentration of 30% into the mixed system, transferring the mixed system into a centrifuge tube after reacting for 1 hour, placing the centrifuge tube in a centrifuge for centrifugation for 15 minutes at the rotation speed of 2500r/min, repeatedly washing the upper liquid with deionized water, centrifuging to obtain a precipitate until the pH value of the upper liquid is neutral, taking the upper clear liquid, carrying out vacuum filtration on the upper clear liquid to a nylon filter membrane, then placing powder on the filter membrane into a 50 ℃ vacuum drying box, and drying for 20 hours to obtain the hexagonal boron nitride nanosheet.
8. The abradable seal coating material of claim 7, wherein the hexagonal boron nitride powder, concentrated H2SO4The mass ratio of the potassium hypermanganite powder to the hydrogen peroxide is 2: (90-92): 1: 15.
9. the abradable seal coating material of claim 5, wherein the matrix asphalt is at least one of petroleum asphalt and coal asphalt, the swelling agent is furfural extract oil, and the stabilizer is at least one of butyl rubber, ethylene propylene diene monomer, nitrile rubber and butadiene rubber.
10. A method of making an abradable seal coating material as claimed in any one of claims 1-9, comprising the steps of:
s1, mixing, heating and uniformly stirring the modified asphalt and the dispersing agent to obtain a mixed emulsion;
s2, dispersing the inorganic nano particles into the mixed emulsion, and performing ultrasonic dispersion for 10min and uniformly stirring to obtain the coating material.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
| US20100203336A1 (en) * | 2007-05-24 | 2010-08-12 | Ming Liang Shiao | Roofing granules with high solar reflectance, roofing products with high solar reflectance, and processes for preparing same |
| KR101630673B1 (en) * | 2015-09-24 | 2016-06-16 | 한국투수개발 주식회사 | Modified asphalt binder manufacture and asphalt concrete composition |
| CN106947271A (en) * | 2017-03-16 | 2017-07-14 | 长安大学 | A kind of composite modified asphalt based on multi-element biologic material and preparation method thereof |
| CN109610262A (en) * | 2018-11-30 | 2019-04-12 | 南京道润交通科技有限公司 | The ultra-thin antiskid wearing layer of single particle size and its construction technology for road preventive maintenance |
-
2021
- 2021-12-08 CN CN202111489914.5A patent/CN114085612A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143967A (en) * | 2006-09-14 | 2008-03-19 | 湖南大学 | Inorganic nano particle and polymer composite modified emulsified asphalt |
| US20100203336A1 (en) * | 2007-05-24 | 2010-08-12 | Ming Liang Shiao | Roofing granules with high solar reflectance, roofing products with high solar reflectance, and processes for preparing same |
| KR101630673B1 (en) * | 2015-09-24 | 2016-06-16 | 한국투수개발 주식회사 | Modified asphalt binder manufacture and asphalt concrete composition |
| CN106947271A (en) * | 2017-03-16 | 2017-07-14 | 长安大学 | A kind of composite modified asphalt based on multi-element biologic material and preparation method thereof |
| CN109610262A (en) * | 2018-11-30 | 2019-04-12 | 南京道润交通科技有限公司 | The ultra-thin antiskid wearing layer of single particle size and its construction technology for road preventive maintenance |
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