CN112194260A - Treatment process for reducing scale generation rate in high-temperature water pump - Google Patents
Treatment process for reducing scale generation rate in high-temperature water pump Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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Abstract
The invention discloses a treatment process for reducing the scale generation rate in a high-temperature water pump, which relates to the technical field of water pump processing, and specifically comprises the following steps: 1) preparing composite nano particles; 2) preparing polystyrene microspheres; 3) processing to obtain porous polymer microspheres; 4) loading the composite nano particles in the pretreated porous polymer microspheres to obtain descaling slow-release particles; 5) adding the descaling slow-release particles into the water-based epoxy resin waterproof coating, coating the formed coating on the inner surface of the water pump pipeline, and curing to finish the water pump treatment process. In the invention, the inner wall of the pipeline through which the fluid medium in the water pump flows is coated with the waterproof coating containing the descaling slow-release particles, and the loaded 2, 3-dihydroxy sodium succinate can dissolve and remove calcium and magnesium water scales, so that the generation rate of the water scales in the water pump is reduced, the abrasion of the water pump impeller by the water scale particles is reduced, and the service life of the water pump is prolonged.
Description
Technical Field
The invention belongs to the technical field of water pump processing, and particularly relates to a treatment process for reducing the generation rate of water scale in a high-temperature water pump.
Background
The scale refers to a layer of solid substances which are gradually accumulated on a contact surface when fluid is contacted with a solid on a heating surface or a heat transfer surface. The phenomenon of scale is seen everywhere, and along with us, human beings have not found the harm that the scale brought for a long time, so neglected the research on the scale. In China, the loss caused by scale is far higher than that of developed countries, and the boiler of a power station is investigated in 2000 by Yang's best in the book, Xuzhiming and the like, and the results show that: boiler scale causes a significant increase in fuel and maintenance costs, and the resulting economic loss is about 100.08 billion, which represents 0.11% of the GDP in 2000. As an industrial large country, China has more widely used heat exchange equipment compared with a power station boiler, and the loss caused by the scale is probably 90 billion yuan of RMB according to the total value of 29447 billion yuan of the Chinese industry in 1996.
At present, heat exchange equipment is widely applied to the industrial and civil fields, a large amount of scale can be formed on the inner wall of a heat exchanger pipeline, the heat transfer efficiency of the equipment is reduced, and therefore the fuel consumption is increased, and the environmental pollution is brought. When high-temperature fluid flows in the water pump, calcium and magnesium ions in the medium water are easily combined with carbonate ions and the like in water to generate a salt mixture which is difficult to dissolve in water, such as calcium carbonate, magnesium carbonate and the like, and tiny particles which are formed at first are suspended in hot water and form precipitates after settling, the precipitates can be converted into a very hard scale layer after a long time, and the particles and blocky particles in the water cause great abrasion on a water pump impeller and a mechanical sealing element due to high hardness, after the impeller is abraded, the pressure of the water pump is greatly reduced, a serious person cannot repair the water pump, the mechanical sealing element runs at a high speed relatively on a moving ring and a static ring, the surface of the sealing element is abraded, the service life of the mechanical sealing element is shortened, and the serious person fails to work and leaks water. Therefore, the scale layer formed in the water pump is removed in time, the abrasion of the water pump impeller and the mechanical sealing element can be effectively reduced, and the service life of the water pump is prolonged. In the prior art, the water scale formed in the water pump is mainly removed by a method of stopping cleaning, and the technical process can only remove a water scale layer formed in the water pump, so that the influence of the water scale on the operation of the water pump is reduced, but the cleaning method cannot improve the abrasion of water pump impellers caused by water scale particles suspended in a high-temperature medium in the operation process of the water pump.
Disclosure of Invention
The invention aims to provide a treatment process for reducing the scale generation rate in a high-temperature water pump, aiming at the existing problems.
The invention is realized by the following technical scheme:
a treatment process for reducing the scale generation rate in a high-temperature water pump comprises the following specific processes:
1) dissolving sodium hydroxide into deionized water according to the mass-to-volume ratio of 1:1.65-1.75g/L, keeping the temperature of the water bath at 80-85 ℃, adding hexadecyl trimethyl ammonium bromide according to 0.2-0.4% of the mass of the deionized water under stirring at 70-100r/min, adding a proper amount of 2, 3-dihydroxy sodium succinate, controlling the molar ratio of the hexadecyl trimethyl ammonium bromide to the 2, 3-dihydroxy sodium succinate to be 1:4-5, slowly dropwise adding tetraethyl silicate into the solution according to 1-2% of the volume of the deionized water after dissolving, violently stirring the mixed solution for 2-3h at 350r/min for 300-9000 r/min, centrifugally separating the suspension for 5-10min after the reaction is finished, repeatedly washing with the deionized water, drying in an oven at 50-60 ℃ for 6-8h, obtaining composite nano particles; in the invention, tetraethyl silicate is used as a silicon source, cetyl trimethyl ammonium bromide is used as a micelle template, 2, 3-dihydroxy sodium succinate is dissolved in the formed mesoporous silica by a hydrothermal method to form composite nano particles with a slow release effect, the 2, 3-dihydroxy sodium succinate loaded on the composite nano particles can be slowly separated out from the micelles in the mesoporous silica, the separated 2, 3-dihydroxy sodium succinate is easily dissolved in water to be alkalescent, and forms a stable coordination compound with calcium and magnesium ions after the action of calcium and magnesium scales, so that the molecular structure of the calcium and magnesium scales is destroyed and dissolved and removed, and the 2, 3-dihydroxy sodium succinate is slowly separated out and is alkalescent, so that the corrosion effect on the material of a water pump can not be caused, and in the slow separation process of the 2, 3-dihydroxy sodium succinate, the 2, 3-dihydroxy sodium succinate in the fluid medium in the water pump can react with generated calcium and magnesium scales in time, and can reduce the generation of suspended scale particles in the fluid medium, thereby reducing the abrasion of the impeller of the water pump and prolonging the service life of the water pump;
2) weighing styrene, polyvinylpyrrolidone and azobisisobutyronitrile according to the mass ratio of 10-13:2-3:0.1, adding a mixed solvent of absolute ethyl alcohol and ethylene glycol monomethyl ether in the volume ratio of 7-10:1, controlling the mass volume ratio of the styrene to the mixed solvent to be 1:20-30g/mL, stirring and reacting for 20-24h at 50-80r/min in an oil bath at 70-75 ℃ under the atmosphere of nitrogen, cooling to room temperature after the reaction is finished, carrying out centrifugal separation, repeatedly washing the product for 4-6 times by using the mixed solvent of ethyl alcohol and deionized water, and carrying out vacuum drying for 6-8h at 60-70 ℃ to obtain polystyrene microspheres;
3) adding polystyrene microspheres into 0.25-0.3 mass percent of lauryl sodium sulfate ethanol aqueous solution according to the mass ratio of 1:80-100, adding chlorododecane and performing ultrasonic dispersion for 10-15min at 300-400W according to the mass ratio of the chlorododecane to the polystyrene microspheres of 1:1-1.3, magnetically stirring and swelling for 10-12h under the protection of nitrogen, then adding sodium dodecyl sulfate ethanol aqueous solution according to 75-80% of the mass of the first added sodium dodecyl sulfate ethanol aqueous solution, injecting styrene and divinyl benzene according to 2-3%, 3-4%, 2-3%, 1-1.5% and 3-5% of the total mass of a reaction system, adding toluene and anisole peroxide, finally adding acrylamide, performing ultrasonic emulsification treatment for 5-10min at 200-300W after mixing, continuously swelling for 10-12h, standing, separating, adding 4-6% polyvinylpyrrolidone aqueous solution according to 2-3% of the total mass of the reaction system, heating to 70-75 ℃ under the protection of nitrogen, carrying out polymerization reaction for 23-26h, cooling after the reaction is finished, centrifuging, washing, and carrying out vacuum drying for 5-6h at 60-70 ℃ to obtain porous polymer microspheres; in the invention, a polystyrene seed microsphere with better monodispersity is prepared by a dispersion polymerization method, and then functional monomer acrylamide is introduced into the microsphere to form a polymer microsphere with a porous structure, wherein the polymer microsphere can be used as a carrier to load composite nano particles into the porous structure, so that the composite nano particles are limited in solid, the migration loss of the composite nano particles is inhibited, the precipitation path of 2, 3-dihydroxy sodium succinate can be further increased, the precipitation of the 2, 3-dihydroxy sodium succinate is delayed, and the slow release effect is further realized;
4) adding porous polymer microspheres into zinc oxide sol with the solid content of 2-3% according to the mass-to-volume ratio of 1:25-35g/mL, carrying out ultrasonic treatment for 20-30min at 60-70 ℃ by using 200-300W, taking out the product, putting the product into a mixed water solution consisting of zinc nitrate with the concentration of 0.02-0.025mol/L and hexamethylenetetramine with the concentration of 0.02-0.025mol/L according to the mass-to-volume ratio of 1:20-30g/mL, reacting for 3-4h in a water bath at 90-95 ℃, cleaning the obtained product by using deionized water, putting the cleaned product into an oven at 60-65 ℃ to dry the product to constant weight, and pretreating the porous polymer microspheres for later use; according to the invention, the porous polymer microsphere is pretreated, a layer of zinc oxide nano-rods uniformly and densely grows on the surface of the porous polymer microsphere, and the porous polymer microsphere has high surface roughness due to the fluctuation of the nano-rods, so that the porous polymer microsphere has excellent hydrophobic performance after being treated; adding the composite nano particles into deionized water, performing 300-400W ultrasonic dispersion for 15-20min to form a dispersion liquid with the mass concentration of 5-8%, uniformly paving the porous polymer microspheres at the bottom of a middle container, adding the dispersion liquid according to the mass ratio of the dispersion liquid to the porous polymer microspheres of 1:2-3, vacuumizing to 0.03-0.05MPa, keeping for 30-40min, and performing vacuum drying on the obtained product to obtain descaling slow-release particles; in the invention, the porous polymer has good adsorption effect on the composite nano-particles under the vacuum condition, so that the composite nano-particles can completely enter the gaps of the porous structure, and water molecules can be prevented from entering the gaps of the porous structure when the porous polymer is subjected to hydrophobic pretreatment during vacuum adsorption, so that the porous polymer only loads the composite nano-particles, thereby improving the loading rate of the porous polymer on the composite nano-particles;
5) adding the descaling slow-release particles into the water-based epoxy resin waterproof coating according to the total mass of 2-3.5% of the water-based epoxy resin waterproof coating, stirring at the rotation speed of 150-180r/min for 20-30min, uniformly coating the formed coating on the inner surface of a pipeline through which a water pump fluid medium flows, controlling the thickness of the coating to be 2-3mm, curing at 25-30 ℃ for 10-12h, and curing in an oven at 45-50 ℃ for 6-8d to finish the treatment process of the water pump; by introducing the descaling slow-release particles into the water-based epoxy resin waterproof coating, the 2, 3-dihydroxy sodium succinate in the descaling slow-release particles can be slowly released, so that the formation of scale in a fluid medium is effectively inhibited, and the abrasion loss of the water pump impeller is reduced.
Further, the preparation method of the water-based epoxy resin waterproof coating comprises the following steps: according to the weight portion, 80-100 portions of epoxy resin is stirred and preheated for 15-25min at 50-55 ℃, 5-10 portions of monoamino polyether amine M-600 are dripped, the temperature is raised to 70-80 ℃ for reaction for 2-3h to obtain modified epoxy resin, 50-60 portions of aqueous curing agent, 2-4 portions of curing accelerator N, N-dimethylaniline, 0.5-1 portion of defoaming agent KS-66 and 1-2 portions of flatting agent BYK-333 are added into 40-60 portions of deionized water, the modified epoxy resin is added after stirring and dispersing uniformly, and the aqueous epoxy resin waterproof coating is obtained after immediate strong dispersion.
Compared with the prior art, the invention has the following advantages:
according to the invention, the inner wall of the pipeline through which a fluid medium flows in the water pump is coated with the waterproof coating containing the descaling slow-release particles, so that the sodium 2, 3-dihydroxysuccinate loaded in the descaling slow-release particles can be slowly released and separated out, and forms a stable coordination compound with calcium and magnesium ions after the sodium 2, 3-dihydroxysuccinate reacts with calcium and magnesium scales, thereby destroying the molecular structures of the calcium and magnesium scales, dissolving and removing the calcium and magnesium scales, effectively reducing the content of the suspended scale particles in the fluid medium, inhibiting the generation of the calcium and magnesium scales in the water pump, realizing the reduction of the scale generation rate in the water pump, reducing the abrasion of the scale particles on an impeller of the water pump, and contributing to prolonging the service life of the water pump.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A treatment process for reducing the scale generation rate in a high-temperature water pump comprises the following specific processes:
1) dissolving sodium hydroxide into deionized water according to the mass-to-volume ratio of 1:1.65g/L, keeping the temperature of the water bath at 80 ℃, stirring at 70r/min, adding hexadecyl trimethyl ammonium bromide according to 0.2 percent of the mass of the deionized water, adding a proper amount of 2, 3-dihydroxy sodium succinate, controlling the molar ratio of the hexadecyl trimethyl ammonium bromide to the 2, 3-dihydroxy sodium succinate to be 1:4-5, slowly dropwise adding tetraethyl silicate into the solution according to 1 percent of the volume of the deionized water after dissolving, violently stirring the mixed solution at 300r/min for reacting for 2 hours, centrifugally separating the suspension for 5 minutes at 8000r/min after the reaction is finished, repeatedly washing with the deionized water, and drying in an oven at 50 ℃ for 6 hours to obtain composite nano particles;
2) weighing styrene, polyvinylpyrrolidone and azobisisobutyronitrile according to a mass ratio of 10:2:0.1, adding a mixed solvent of absolute ethyl alcohol and ethylene glycol monomethyl ether with a volume ratio of 7:1, controlling the mass volume ratio of the styrene to the mixed solvent to be 1:20g/mL, stirring and reacting for 20 hours at 50r/min in a 70 ℃ oil bath under a nitrogen atmosphere, cooling to room temperature after the reaction is finished, carrying out centrifugal separation, repeatedly washing the product for 4 times by using the mixed solvent of ethanol and deionized water, and carrying out vacuum drying for 6 hours at 60 ℃ to obtain polystyrene microspheres;
3) adding polystyrene microspheres into an ethanol aqueous solution of lauryl sodium sulfate with the mass fraction of 0.25% according to the mass ratio of 1:80, adding chlorododecane and ultrasonically dispersing for 10min at 300W according to the mass ratio of 1:1 of the chlorododecane to the polystyrene microspheres, magnetically stirring and swelling for 10h under the protection of nitrogen, then adding an ethanol aqueous solution of the lauryl sodium sulfate according to 75% of the mass of the ethanol aqueous solution of the lauryl sodium sulfate added for the first time, injecting styrene and divinylbenzene according to 2%, 3%, 2%, 1% and 3% of the total mass of a reaction system, adding toluene and anisole peroxide, finally adding acrylamide, mixing, carrying out ultrasonic emulsification treatment for 5min at 200W, continuing swelling for 10h, standing, separating, adding a polyvinylpyrrolidone aqueous solution with the mass fraction of 4% according to 2% of the total mass of the reaction system, heating to 70 ℃ under the protection of nitrogen for polymerization reaction for 23 hours, cooling after the reaction is finished, centrifuging, washing, and vacuum drying at 60 ℃ for 5 hours to obtain porous polymer microspheres;
4) adding porous polymer microspheres into zinc oxide sol with the solid content of 2% according to the mass-to-volume ratio of 1:25g/mL, carrying out ultrasonic treatment for 20min at 60 ℃ under 200W, taking out a product, putting the product into a mixed water solution consisting of zinc nitrate with the concentration of 0.02mol/L and hexamethylenetetramine with the concentration of 0.02mol/L according to the mass-to-volume ratio of 1:20g/mL, reacting for 3h in a water bath at 90 ℃, washing the obtained product with deionized water, putting the product into a drying oven at 60 ℃ for drying to constant weight, pretreating the porous polymer microspheres for later use, adding composite nano particles into the deionized water, carrying out ultrasonic dispersion for 15min at 300W to form a dispersion liquid with the mass concentration of 5%, uniformly spreading the porous polymer microspheres at the bottom of the middle container, adding the dispersion liquid according to the mass ratio of the dispersion liquid to the porous polymer microspheres of 1:2, vacuumizing to 0.03MPa, keeping for 30min, and vacuum drying the obtained product to obtain descaling slow-release particles;
5) adding the descaling slow-release particles into the water-based epoxy resin waterproof coating according to 2% of the total mass of the water-based epoxy resin waterproof coating, stirring for 20min at the rotating speed of 150r/min, uniformly coating the formed coating on the inner surface of a pipeline through which a water pump fluid medium flows, controlling the thickness of the coating to be 2mm, curing for 10h at 25 ℃, and curing for 6d in a 45 ℃ oven to complete the treatment process of the water pump.
Further, the preparation method of the water-based epoxy resin waterproof coating comprises the following steps: according to the weight parts, 80 parts of epoxy resin E-51 is stirred and preheated at 50 ℃ for 15min, 5 parts of monoamino polyetheramine M-600 is dropwise added, the temperature is raised to 70 ℃ for reaction for 2h to obtain modified epoxy resin, 50 parts of water-based curing agent (purchased from Bans New Synthesis Material (Shenzhen) Co., Ltd., BS-778 water-based epoxy curing agent), 2 parts of curing accelerator N, N-dimethylaniline, 0.5 part of defoaming agent KS-66 and 1 part of flatting agent BYK-333 are added into 40 parts of deionized water, the modified epoxy resin is added after stirring and dispersing uniformly, and the water-based epoxy resin waterproof coating is obtained by immediately and strongly dispersing.
Example 2
A treatment process for reducing the scale generation rate in a high-temperature water pump comprises the following specific processes:
1) dissolving sodium hydroxide into deionized water according to the mass-to-volume ratio of 1:1.7g/L, keeping the temperature of the water bath at 82 ℃, stirring at 85r/min, adding hexadecyl trimethyl ammonium bromide according to 0.3 percent of the mass of the deionized water, adding a proper amount of 2, 3-dihydroxy sodium succinate, controlling the molar ratio of the hexadecyl trimethyl ammonium bromide to the 2, 3-dihydroxy sodium succinate to be 1:4.5, slowly dropwise adding tetraethyl silicate into the solution according to 1.5 percent of the volume of the deionized water after dissolving, violently stirring the mixed solution at 320r/min for reacting for 2.5 hours, centrifugally separating the suspension at 8500r/min for 8 minutes after the reaction is finished, repeatedly washing with the deionized water, and drying in an oven at 55 ℃ for 7 hours to obtain composite nano particles;
2) weighing styrene, polyvinylpyrrolidone and azobisisobutyronitrile according to the mass ratio of 12:2.5:0.1, adding a mixed solvent of absolute ethyl alcohol and ethylene glycol monomethyl ether in the volume ratio of 8:1, controlling the mass volume ratio of the styrene to the mixed solvent to be 1:25g/mL, stirring and reacting for 22h at 70r/min in an oil bath at 73 ℃ under the atmosphere of nitrogen, cooling to room temperature after the reaction is finished, carrying out centrifugal separation, repeatedly washing the product for 5 times by using the mixed solvent of ethanol and deionized water, and carrying out vacuum drying for 7h at 65 ℃ to obtain polystyrene microspheres;
3) adding polystyrene microspheres into 0.28 mass percent of an ethanol aqueous solution of lauryl sodium sulfate according to the mass ratio of 1:90, adding chlorododecane according to the mass ratio of 1:1.2 of the chlorododecane to the polystyrene microspheres, ultrasonically dispersing for 13min at 350W, magnetically stirring and swelling for 11h under the protection of nitrogen, then adding an ethanol aqueous solution of the lauryl sodium sulfate according to 78 mass percent of the ethanol aqueous solution of the first added lauryl sodium sulfate, injecting styrene and divinylbenzene according to 2.5, 3.5, 2.5, 1.3 and 4 mass percent of the total mass of a reaction system, adding toluene and anisole peroxide, finally adding acrylamide, mixing, carrying out ultrasonic emulsification treatment for 8min at 250W, continuously swelling for 11h, standing, separating, adding a polyvinylpyrrolidone aqueous solution with the mass percent of 5 percent according to 2.5 mass percent of the total mass of the reaction system, heating to 72 ℃ under the protection of nitrogen for polymerization reaction for 25h, cooling after the reaction is finished, centrifuging, washing, and vacuum drying at 65 ℃ for 5.5h to obtain porous polymer microspheres;
4) adding porous polymer microspheres into zinc oxide sol with the solid content of 2.5% according to the mass-to-volume ratio of 1:30g/mL, carrying out ultrasonic treatment for 25min at 65 ℃ under 250W, taking out a product, then putting the product into a mixed aqueous solution consisting of zinc nitrate with the concentration of 0.023mol/L and hexamethylenetetramine with the concentration of 0.023mol/L according to the mass-to-volume ratio of 1:25g/mL, reacting for 3.5h in a water bath at 93 ℃, washing the obtained product with deionized water, then putting the product into an oven at 62 ℃ for drying until the weight is constant, pretreating the porous polymer microspheres for later use, adding composite nano particles into the deionized water, carrying out ultrasonic dispersion for 17min at 350W to form a dispersion liquid with the mass concentration of 6%, uniformly paving the bottom of a middle container, adding the dispersion liquid according to the mass ratio of 1:2.5 of the dispersion liquid to the porous polymer microspheres, vacuumizing to 0.04MPa, keeping for 35min, and vacuum drying the obtained product to obtain descaling slow-release particles;
5) adding the descaling slow-release particles into the water-based epoxy resin waterproof coating according to 3% of the total mass of the water-based epoxy resin waterproof coating, stirring for 25min at the rotating speed of 170r/min, uniformly coating the formed coating on the inner surface of a pipeline through which a water pump fluid medium flows, controlling the thickness of the coating to be 3mm, curing for 11h at 28 ℃, and curing for 7d in a 46 ℃ oven to complete the treatment process of the water pump.
Further, the preparation method of the water-based epoxy resin waterproof coating comprises the following steps: according to the weight parts, 90 parts of epoxy resin E-51 is stirred and preheated at 53 ℃ for 20min, 8 parts of monoamino polyetheramine M-600 is dropwise added, the temperature is raised to 75 ℃ for reaction for 2.5h to obtain modified epoxy resin, 55 parts of water-based curing agent (purchased from Bans New Synthesis Material (Shenzhen) Co., Ltd., BS-778 water-based epoxy curing agent), 3 parts of curing accelerator N, N-dimethylaniline, 0.8 part of defoaming agent KS-66 and 1.5 parts of flatting agent BYK-333 are added into 50 parts of deionized water, the modified epoxy resin is added after stirring and dispersing uniformly, and the water-based epoxy resin waterproof coating is obtained by immediately and strongly dispersing.
Example 3
A treatment process for reducing the scale generation rate in a high-temperature water pump comprises the following specific processes:
1) dissolving sodium hydroxide into deionized water according to the mass-to-volume ratio of 1:1.75g/L, keeping the temperature of the deionized water in a water bath at 85 ℃, stirring the deionized water at 100r/min, adding hexadecyl trimethyl ammonium bromide according to 0.4 percent of the mass of the deionized water, adding a proper amount of 2, 3-dihydroxy sodium succinate, controlling the molar ratio of the hexadecyl trimethyl ammonium bromide to the 2, 3-dihydroxy sodium succinate to be 1:5, slowly dropwise adding tetraethyl silicate into the solution according to 2 percent of the volume of the deionized water after dissolving, violently stirring the mixed solution at 350r/min for reacting for 3h, centrifugally separating the suspension after the reaction is finished for 10min at 9000r/min, repeatedly washing the suspension with the deionized water, and drying the suspension in a 60 ℃ oven for 8h to obtain composite nano particles;
2) weighing styrene, polyvinylpyrrolidone and azobisisobutyronitrile according to a mass ratio of 13:3:0.1, adding a mixed solvent of absolute ethyl alcohol and ethylene glycol monomethyl ether with a volume ratio of 10:1, controlling the mass volume ratio of the styrene to the mixed solvent to be 1:30g/mL, stirring and reacting for 24 hours at 80r/min in a 75 ℃ oil bath under a nitrogen atmosphere, cooling to room temperature after the reaction is finished, carrying out centrifugal separation, repeatedly washing the product for 6 times by using the mixed solvent of ethanol and deionized water, and carrying out vacuum drying for 8 hours at 70 ℃ to obtain polystyrene microspheres;
3) adding polystyrene microspheres into an ethanol aqueous solution of lauryl sodium sulfate with the mass fraction of 0.3% according to the mass ratio of 1:100, adding chlorododecane and ultrasonically dispersing for 15min at 400W according to the mass ratio of 1:1.3 of the chlorododecane to the polystyrene microspheres, magnetically stirring and swelling for 12h under the protection of nitrogen, then adding an ethanol aqueous solution of the lauryl sodium sulfate according to 80% of the mass of the ethanol aqueous solution of the lauryl sodium sulfate added for the first time, injecting styrene and divinylbenzene according to 3%, 4%, 3%, 1.5% and 5% of the total mass of a reaction system, adding toluene and anisole peroxide, finally adding acrylamide, mixing, carrying out ultrasonic emulsification treatment at 300W for 10min, continuously swelling for 12h, carrying out liquid separation, adding a polyvinylpyrrolidone aqueous solution with the mass fraction of 6% according to 3% of the total mass of the reaction system, heating to 75 ℃ under the protection of nitrogen for polymerization reaction for 26h, cooling after the reaction is finished, centrifuging, washing, and vacuum-drying at 70 ℃ for 6h to obtain porous polymer microspheres;
4) adding porous polymer microspheres into zinc oxide sol with the solid content of 3% according to the mass-to-volume ratio of 1:35g/mL, carrying out ultrasonic treatment at 70 ℃ for 30min at 300W, taking out a product, putting the product into a mixed water solution consisting of zinc nitrate with the concentration of 0.025mol/L and hexamethylenetetramine with the concentration of 0.025mol/L according to the mass-to-volume ratio of 1:30g/mL, reacting in a water bath at 95 ℃ for 4h, washing the obtained product with deionized water, putting the product into a drying oven at 65 ℃ for drying to constant weight, pretreating the porous polymer microspheres for later use, adding composite nano particles into the deionized water, carrying out ultrasonic dispersion at 400W for 20min to form a dispersion liquid with the mass concentration of 8%, uniformly spreading the porous polymer microspheres at the bottom of the middle container, adding the dispersion liquid according to the mass ratio of the dispersion liquid to the porous polymer microspheres of 1:3, vacuumizing to 0.05MPa, keeping for 40min, and vacuum drying the obtained product to obtain descaling slow-release particles;
5) adding the descaling slow-release particles into the water-based epoxy resin waterproof coating according to 3.5 percent of the total mass of the water-based epoxy resin waterproof coating, stirring for 30min at the rotating speed of 180r/min, uniformly coating the formed coating on the inner surface of a pipeline through which a water pump fluid medium flows, controlling the thickness of the coating to be 3mm, curing for 12h at 30 ℃, and curing for 8d in a 50 ℃ oven to finish the treatment process of the water pump.
Further, the preparation method of the water-based epoxy resin waterproof coating comprises the following steps: according to the weight parts, 100 parts of epoxy resin E-51 is stirred and preheated at 55 ℃ for 25min, 10 parts of monoamino polyetheramine M-600 is dripped, the temperature is raised to 80 ℃ for reaction for 3h to obtain modified epoxy resin, 60 parts of water-based curing agent (purchased from Bans New Synthesis Material (Shenzhen) Co., Ltd., BS-778 water-based epoxy curing agent), 4 parts of curing accelerator N, N-dimethylaniline, 1 part of defoamer KS-66 and 2 parts of flatting agent BYK-333 are added into 60 parts of deionized water, the modified epoxy resin is added after stirring and dispersing uniformly, and strong dispersion is immediately carried out, so that the water-based epoxy resin waterproof coating is obtained.
Test experiments
WNS0.5-1.0-YQ type hot water boiler provided by Taikang county Tai boiler equipment manufacturing company Limited and DG type multi-stage boiler feed pump provided by Changsha Sanchang Pump industry Limited are adopted, underground water is used in the boiler, the temperature of the boiler is maintained between 80-85 ℃, then the feed pump is processed by the process method provided by the embodiment 1-3, and the processed feed pump is processedThe water feeding pump is used as a circulating pump to continuously circulate hot water in the hot water boiler, a water inlet and a water outlet are arranged in the hot water boiler, the water outlet continuously discharges hot water, the water inlet continuously supplies groundwater to the boiler, the water flow of the water inlet and the water flow of the water outlet are the same and are both 150m3And h, before the test is started, scales are not generated in the boiler and the water pump, then the water feeding pump is started, hot water in the boiler is continuously circulated for 1 year, then the generation condition of the scales on the inner wall of the boiler and the abrasion condition of an impeller of the water feeding pump are observed, and the results are as follows: no obvious scale phenomenon appears on the inner wall of the boiler, and no obvious abrasion appears on the impeller; meanwhile, the invention is also provided with a control group, the same experimental method is adopted, the only difference is that the feed pump is directly used without processing, and the obtained result is as follows: the inner wall of the boiler has obvious scale phenomenon, the thickness of the scale is between 0.5 and 0.8mm, and the impeller also has obvious abrasion.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (9)
1. A treatment process for reducing the scale generation rate in a high-temperature water pump is characterized by comprising the following specific processes:
1) dissolving a proper amount of sodium hydroxide in deionized water, keeping the temperature of the deionized water in a water bath at 80-85 ℃, adding a proper amount of hexadecyl trimethyl ammonium bromide and 2, 3-dihydroxy sodium succinate under stirring, slowly dropwise adding a proper amount of tetraethyl silicate into the solution after dissolving, violently stirring the mixed solution for reacting for 2-3 hours, centrifugally separating the suspension after the reaction is finished, repeatedly washing the suspension with deionized water, and drying the suspension in an oven to obtain composite nano particles;
2) weighing a proper amount of styrene, polyvinylpyrrolidone and azobisisobutyronitrile, adding a mixed solvent of absolute ethyl alcohol and ethylene glycol monomethyl ether in a certain proportion, stirring and reacting for 20-24h in an oil bath at 70-75 ℃ under a nitrogen atmosphere at 50-80r/min, cooling to room temperature after the reaction is finished, repeatedly washing the product for 4-6 times by using the mixed solvent of ethanol and deionized water after centrifugal separation, and vacuum drying to obtain polystyrene microspheres;
3) adding a proper amount of polystyrene microspheres into an ethanol aqueous solution of sodium dodecyl sulfate, adding a proper amount of chlorododecane, ultrasonically dispersing for 10-15min at 400W under the protection of 300-;
4) adding porous polymer microspheres into zinc oxide sol according to the mass-to-volume ratio of 1:25-35g/mL, carrying out ultrasonic treatment at 60-70 ℃ for 20-30min by using 200-300W, taking out a product, then adding the product into a mixed aqueous solution consisting of zinc nitrate and hexamethylenetetramine according to the mass-to-volume ratio of 1:20-30g/mL, reacting in a water bath at 90-95 ℃ for 3-4h, cleaning the obtained product with deionized water, drying in a drying oven at 60-65 ℃ to constant weight, pretreating the porous polymer microspheres for later use, adding composite nanoparticles into the deionized water, carrying out ultrasonic dispersion to form a dispersion liquid, uniformly spreading the porous polymer microspheres at the bottom of a middle container, adding a proper amount of the dispersion liquid, vacuumizing, keeping for 30-40min, carrying out vacuum drying on the obtained product, obtaining descaling slow-release particles;
5) adding a proper amount of scale removal slow-release particles into the water-based epoxy resin waterproof coating, stirring for 20-30min at the rotation speed of 150-180r/min, uniformly coating the formed coating on the inner surface of a pipeline through which a fluid medium of the water pump flows, curing for 10-12h at 25-30 ℃, and curing for 6-8d in an oven at 45-50 ℃ to finish the treatment process of the water pump.
2. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 1), the mass-to-volume ratio of the sodium hydroxide to the deionized water is 1:1.65-1.75 g/L; the stirring speed is 70-100 r/min; the rotating speed of the violent stirring is 300-350 r/min; the rotation speed of the centrifugal separation is 8000-9000r/min, and the separation time is 5-10 min; the drying temperature is 50-60 ℃, and the drying time is 6-8 h.
3. The process according to claim 1, wherein in the step 1), the molar ratio of the cetyl trimethyl ammonium bromide to the sodium 2, 3-dihydroxysuccinate is 1: 4-5; the addition amount of the hexadecyl trimethyl ammonium bromide is 0.2-0.4% of the mass of the deionized water; the addition amount of the tetraethyl silicate is 1-2% of the volume of the deionized water.
4. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 2), the mass ratio of the styrene to the polyvinylpyrrolidone to the azobisisobutyronitrile is 10-13:2-3: 0.1; the volume ratio of the absolute ethyl alcohol to the ethylene glycol monomethyl ether is 7-10: 1; the mass volume ratio of the styrene to the mixed solvent is 1:20-30 g/mL; the temperature of the vacuum drying is 60-70 ℃, and the drying time is 6-8 h.
5. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 3), the mass ratio of the polystyrene microspheres to the ethanol aqueous solution of sodium dodecyl sulfate is 1: 80-100; the mass fraction of the ethanol aqueous solution of the sodium dodecyl sulfate is 0.25-0.3%; the mass ratio of the chlorododecane to the polystyrene microspheres is 1: 1-1.3; the addition amount of the ethanol water solution of the sodium dodecyl sulfate is 75-80% of the mass of the ethanol water solution of the sodium dodecyl sulfate added for the first time.
6. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the step 3), the addition amounts of the styrene, the divinyl benzene, the toluene, the anisole peroxide and the acrylamide are 2-3%, 3-4%, 2-3%, 1-1.5% and 3-5% of the total mass of the reaction system; the mass fraction of the polyvinylpyrrolidone aqueous solution is 4-6%, and the addition amount is 2-3% of the total mass of the reaction system; the temperature of the vacuum drying is 60-70 ℃, and the drying time is 5-6 h.
7. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 4), the solid content of the zinc oxide sol is 2-3%; in the mixed water solution, the concentration of zinc nitrate is 0.02-0.025mol/L, and the concentration of hexamethylene tetramine is 0.02-0.025 mol/L; the power of the ultrasonic dispersion is 300-400W, and the dispersion time is 15-20 min; the mass concentration of the dispersion liquid is 5-8%; the vacuum pressure is 0.03-0.05 MPa; the mass ratio of the dispersion liquid to the porous polymer microspheres is 1: 2-3.
8. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 5), the addition amount of the scale removal slow-release particles is 2-3.5% of the total mass of the water-based epoxy resin waterproof coating; the thickness of the coating is 2-3 mm.
9. The treatment process for reducing the scale formation rate in the high-temperature water pump according to claim 1, wherein in the process step 5), the preparation method of the water-based epoxy resin waterproof coating comprises the following steps: according to the weight portion, 80-100 portions of epoxy resin is stirred and preheated for 15-25min at 50-55 ℃, 5-10 portions of monoamino polyether amine are dripped, the temperature is raised to 70-80 ℃ for reaction for 2-3h to obtain modified epoxy resin, 50-60 portions of aqueous curing agent, 2-4 portions of curing accelerator, 0.5-1 portion of defoaming agent and 1-2 portions of flatting agent are added into 40-60 portions of deionized water, the modified epoxy resin is added after stirring and dispersing uniformly, and the modified epoxy resin is immediately dispersed by force to obtain the aqueous epoxy resin waterproof coating.
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