CN111019515A - Nano silicon dioxide coating for preventing scale of electrothermal steam generating element and preparation method thereof - Google Patents
Nano silicon dioxide coating for preventing scale of electrothermal steam generating element and preparation method thereof Download PDFInfo
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- CN111019515A CN111019515A CN201911349113.1A CN201911349113A CN111019515A CN 111019515 A CN111019515 A CN 111019515A CN 201911349113 A CN201911349113 A CN 201911349113A CN 111019515 A CN111019515 A CN 111019515A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 65
- 238000000576 coating method Methods 0.000 title claims abstract description 53
- 239000011248 coating agent Substances 0.000 title claims abstract description 51
- 239000005543 nano-size silicon particle Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 13
- 229920002545 silicone oil Polymers 0.000 claims abstract description 13
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims abstract description 12
- TXDNPSYEJHXKMK-UHFFFAOYSA-N sulfanylsilane Chemical compound S[SiH3] TXDNPSYEJHXKMK-UHFFFAOYSA-N 0.000 claims abstract description 12
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000002209 hydrophobic effect Effects 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 238000005485 electric heating Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- ZZNQQQWFKKTOSD-UHFFFAOYSA-N diethoxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](OCC)(OCC)C1=CC=CC=C1 ZZNQQQWFKKTOSD-UHFFFAOYSA-N 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 7
- 239000013049 sediment Substances 0.000 claims description 7
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 7
- 239000003607 modifier Substances 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 21
- 239000000843 powder Substances 0.000 abstract description 15
- 230000009471 action Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000000265 homogenisation Methods 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
-
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention relates to the technical field of coatings, and discloses a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element, which comprises the following raw materials in parts by weight: 200 parts of silicon dioxide particles 160, 3-5 parts of mercapto silane, 5-9 parts of vinyl silane, 10-20 parts of amino silane coupling agent, 50-60 parts of hydroxyl silicone oil, 20-30 parts of ethyl orthosilicate and 5-10 parts of dispersing agent. The nano silicon dioxide coating for preventing the scale of the electrothermal steam generating element and the preparation method thereof are characterized in that 200 parts of silicon dioxide particles 160 are sent into a crushing cylinder of an ultrasonic crusher, a proper amount of water and aluminum oxide are added, the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, and the nano silicon dioxide material is independently prepared.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element and a preparation method thereof.
Background
In recent years, with the increasing demand for living quality and the increasing awareness of environmental protection and energy conservation, a surface with a self-cleaning function is rapidly developed, the self-cleaning surface refers to a surface on which pollutants or dust on the surface can automatically fall off or be degraded under the action of external force such as gravity, rainwater or wind power, and the hydrophobic coating is widely applied to various aspects in modern life and industry.
The Chinese patent CN106884158B provides a high-temperature-resistant corrosion-resistant silicon dioxide coating and a preparation method and application thereof, the high-temperature-resistant corrosion-resistant silicon dioxide coating prepared by the invention greatly improves the performance of a water turbine blade, has the advantages of simple preparation process, no pollution, low energy consumption, low cost and high safety factor, is suitable for industrial production, ensures long-term safe and stable operation and service life of a water turbine unit, lacks a systematic preparation method, and relies on external purchase for obtaining nano silicon dioxide, so that the preparation cost is greatly improved, and the nano silicon dioxide coating for preventing scale of an electric heating steam generating element and the preparation method thereof are provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the nano silicon dioxide coating for preventing the scale of the electrothermal steam generating element and the preparation method thereof, which have the advantages of low preparation cost and the like, and solve the problems that the traditional method lacks a systematic preparation method, and the acquisition of the nano silicon dioxide depends on external purchase, so that the preparation cost is greatly improved.
(II) technical scheme
In order to realize the aim of low preparation cost, the invention provides the following technical scheme: a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following raw materials in parts by weight: 200 parts of silicon dioxide particles 160, 3-5 parts of mercapto silane, 5-9 parts of vinyl silane, 10-20 parts of amino silane coupling agent, 50-60 parts of hydroxyl silicone oil, 20-30 parts of ethyl orthosilicate and 5-10 parts of dispersing agent.
Preferably, 5-10 parts of the dispersing agent is sodium dodecyl benzene sulfonate.
A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following steps:
1) 200 parts of silicon dioxide particles 160-;
2) dispersing the nano-silica prepared in the step 1 in an organic solvent, adding a modifier, and then carrying out surface treatment on the nano-silica by using 3-5 parts of mercapto silane, 5-9 parts of vinyl silane and 10-20 parts of amino silane coupling agent to obtain nano-silica 2;
3) adding 50-60 parts of water, hydrochloric acid, ethanol and hydroxy silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating to 55 ℃ in a water bath, dropwise adding diphenyl diethoxy silane into the mixture, dropwise adding a mixture of 20-30 parts of methyl triethoxysilane and ethyl orthosilicate after 20 minutes, reacting at the temperature for 1.5-2 hours after the addition is finished, heating to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after 0.5 hour of reaction, naturally cooling, pouring into a separating funnel, standing, and removing a small amount of sediment to obtain a low-surface-energy material;
4) putting the low-surface-energy material prepared in the step (3) into a container, and adding the nano silicon dioxide 2 prepared in the step (2) to obtain a hydrophobic coating;
5) and (4) putting the hydrophobic coating prepared in the step (4) into a spraying device, spraying the hydrophobic coating to a position where the electric heating steam generating element is easy to generate scale, and solidifying to obtain the nano silicon dioxide coating for preventing the scale of the electric heating steam generating element.
Preferably, the diameter of the nano-silica 1 in the step 2 is 2.07 micrometers.
Preferably, the ultrasonic wave frequency is 20kHz, the power is 1500W, the crushing time is measured by hours, the distance between the stirring rod teeth is 15mm, and the rotating speed is 300 r.min in the analysis of single influence factors-1The concentration of the dispersant was 0.09 g.L-1。
(III) advantageous effects
Compared with the prior art, the invention provides a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element and a preparation method thereof, and the nano silicon dioxide coating has the following beneficial effects:
1. 200 parts of silicon dioxide particles 160-silted silica are sent into a crushing cylinder of an ultrasonic crusher, a proper amount of water and aluminum oxide are added, the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, the raw materials in the aluminum oxide powder are crushed by the acting forces of extrusion, shearing, impact and the like generated by mutual collision among grinding media, slurry with a certain concentration simultaneously generates cavitation under the action of an ultrasonic field to generate high-energy impact waves and microjets, 200 parts of the silicon dioxide particles 160-silted silica are synchronously crushed and dispersed, then particles with different particle sizes are separated by a high-efficiency grouping device, so that the homogenization and the specialization of the particle size distribution of the silicon dioxide powder are realized, the preparation method is low in preparation cost, so that the preparation cost of the nano-silica coating is reduced, the trouble of a user is avoided, and the use of the nano-silica is convenient for the user.
2. Adding 50-60 parts of water, hydrochloric acid, ethanol and hydroxyl silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating in a water bath to 55 ℃, then dropwise adding diphenyl diethoxysilane, dropwise adding 20-30 parts of mixture of methyl triethoxysilane and ethyl orthosilicate after 20 minutes, reacting for 1.5-2 hours at the temperature, then heating to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after 0.5 hour of reaction, naturally cooling, pouring into a separating funnel, standing and removing a small amount of sediment to obtain a low-surface-energy material, putting the low-surface-energy material into a container, adding nano silicon dioxide 2 to obtain a hydrophobic coating, the obtained coating is hydrophobic and oleophobic and can resist the erosion of partial organic solvent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following raw materials in parts by weight: 160 parts of silicon dioxide particles, 3 parts of mercapto silane, 5 parts of vinyl silane, 10 parts of amino silane coupling agent, 50 parts of hydroxyl silicone oil, 20 parts of ethyl orthosilicate and 5 parts of dispersing agent.
5 parts of a dispersing agent is sodium dodecyl benzene sulfonate.
A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following steps:
1) 160 parts of silicon dioxide particles are sent into a crushing cylinder of an ultrasonic crusher, a proper amount of water and aluminum oxide are added, the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, the raw materials in the aluminum oxide powder are crushed by utilizing the acting forces of extrusion, shearing, impact and the like generated by mutual collision among grinding media, slurry with a certain concentration simultaneously generates cavitation under the action of an ultrasonic field to generate high-energy impact waves and microjets, 160 parts of the silicon dioxide particles are synchronously crushed and dispersed, and then the particles with different particle sizes are separated by utilizing a high-efficiency grouping device, so that the homogenization and the specialization of the particle size distribution of the nano silicon dioxide powder are realized, and the nano silicon dioxide 1 is obtained;
2) dispersing the nano-silica prepared in the step 1 in an organic solvent, adding a modifier, and then carrying out surface treatment on the nano-silica by using 3 parts of mercapto silane, 5 parts of vinyl silane and 10 parts of amino silane coupling agent to obtain nano-silica 2;
3) adding a proper amount of water, hydrochloric acid, ethanol and 50 parts of hydroxyl silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating the mixture in a water bath to 55 ℃, then dropwise adding diphenyl diethoxy silane into the mixture, dropwise adding a mixture of 20 parts of methyl triethoxy silane and 20 parts of ethyl orthosilicate after 20 minutes, reacting for 1.5-2 hours at the temperature after the addition is finished, heating the mixture to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after reacting for 0.5 hour, naturally cooling the mixture, pouring the mixture into a separating funnel, standing and removing a small amount of sediments to obtain a low-surface-energy material;
4) putting the low-surface-energy material prepared in the step (3) into a container, and adding the nano silicon dioxide 2 prepared in the step (2) to obtain a hydrophobic coating;
5) and (4) putting the hydrophobic coating prepared in the step (4) into a spraying device, spraying the hydrophobic coating to a position where the electric heating steam generating element is easy to generate scale, and solidifying to obtain the nano silicon dioxide coating for preventing the scale of the electric heating steam generating element.
Step 2 the diameter of the nanosilica 1 is 2.07 microns.
The ultrasonic frequency is 20kHz, the power is 1500W, the crushing time is measured in hours, the spacing between the stirring rod teeth is 15mm, and the rotating speed is 300 r.min in the analysis of single influence factors-1The concentration of the dispersant was 0.09 g.L-1。
Example two: a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following raw materials in parts by weight: 180 parts of silicon dioxide particles, 4 parts of mercapto silane, 7 parts of vinyl silane, 15 parts of amino silane coupling agent, 55 parts of hydroxyl silicone oil, 25 parts of ethyl orthosilicate and 7 parts of dispersing agent.
7 parts of a dispersing agent is sodium dodecyl benzene sulfonate.
A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following steps:
1) sending 180 parts of silicon dioxide particles into a crushing cylinder of an ultrasonic crusher, adding a proper amount of water and aluminum oxide, wherein the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, crushing raw materials in the silicon dioxide particles by utilizing the acting forces such as extrusion, shearing, impact and the like generated by mutual collision among grinding media, simultaneously generating cavitation action on slurry with certain concentration under the action of an ultrasonic field to generate high-energy impact waves and microjets, synchronously crushing and dispersing 180 parts of the silicon dioxide particles, and then separating the particles with different particle sizes by utilizing a high-efficiency grouping device, so that the homogenization and the specialization of the particle size distribution of the nano silicon dioxide powder are realized, and the nano silicon dioxide 1 is obtained;
2) dispersing the nano-silica prepared in the step 1 in an organic solvent, adding a modifier, and then carrying out surface treatment on the nano-silica by using 4 parts of mercapto silane, 7 parts of vinyl silane and 15 parts of amino silane coupling agent to obtain nano-silica 2;
3) adding a proper amount of water, hydrochloric acid, ethanol and 55 parts of hydroxyl silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating the mixture in a water bath to 55 ℃, then dropwise adding diphenyl diethoxysilane into the mixture, dropwise adding 25 parts of mixture of methyltriethoxysilane and ethyl orthosilicate after 20 minutes, reacting for 1.5-2 hours at the temperature after the addition is finished, heating the mixture to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after reacting for 0.5 hour, naturally cooling the mixture, pouring the mixture into a separating funnel, standing and removing a small amount of sediments to obtain a low-surface-energy material;
4) putting the low-surface-energy material prepared in the step (3) into a container, and adding the nano silicon dioxide 2 prepared in the step (2) to obtain a hydrophobic coating;
5) and (4) putting the hydrophobic coating prepared in the step (4) into a spraying device, spraying the hydrophobic coating to a position where the electric heating steam generating element is easy to generate scale, and solidifying to obtain the nano silicon dioxide coating for preventing the scale of the electric heating steam generating element.
Step 2 the diameter of the nanosilica 1 is 2.07 microns.
The ultrasonic frequency is 20kHz, the power is 1500W, the crushing time is measured in hours, the spacing between the stirring rod teeth is 15mm, and the rotating speed is 300 r.min in the analysis of single influence factors-1The concentration of the dispersant was 0.09 g.L-1。
Example three: a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following raw materials in parts by weight: 200 parts of silicon dioxide particles, 5 parts of mercapto silane, 9 parts of vinyl silane, 20 parts of amino silane coupling agent, 60 parts of hydroxyl silicone oil, 30 parts of ethyl orthosilicate and 10 parts of dispersing agent.
10 parts of a dispersing agent is sodium dodecyl benzene sulfonate.
A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element comprises the following steps:
1) 200 parts of silicon dioxide particles are sent into a crushing cylinder of an ultrasonic crusher, a proper amount of water and aluminum oxide are added, the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, the raw materials in the silicon dioxide particles are crushed by utilizing the acting forces of extrusion, shearing, impact and the like generated by mutual collision among grinding media, slurry with a certain concentration simultaneously generates cavitation under the action of an ultrasonic field to generate high-energy impact waves and microjets, 200 parts of the silicon dioxide particles are synchronously crushed and dispersed, and then particles with different particle sizes are separated by utilizing a high-efficiency grouping device, so that the homogenization and the specialization of the particle size distribution of the nano silicon dioxide powder are realized, and the nano silicon dioxide 1 is obtained;
2) dispersing the nano-silica prepared in the step 1 in an organic solvent, adding a modifier, and then carrying out surface treatment on the nano-silica by using 5 parts of mercapto silane, 9 parts of vinyl silane and 20 parts of amino silane coupling agent to obtain nano-silica 2;
3) adding 60 parts of water, hydrochloric acid, ethanol and hydroxy silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating the mixture in a water bath to 55 ℃, then dropwise adding diphenyl diethoxy silane into the mixture, dropwise adding a mixture of 30 parts of methyl triethoxy silane and ethyl orthosilicate after 20 minutes, reacting for 1.5-2 hours at the temperature after the addition is finished, heating the mixture to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after reacting for 0.5 hour, naturally cooling the mixture, pouring the mixture into a separating funnel, standing and removing a small amount of sediments to obtain a low-surface-energy material;
4) putting the low-surface-energy material prepared in the step (3) into a container, and adding the nano silicon dioxide 2 prepared in the step (2) to obtain a hydrophobic coating;
5) and (4) putting the hydrophobic coating prepared in the step (4) into a spraying device, spraying the hydrophobic coating to a position where the electric heating steam generating element is easy to generate scale, and solidifying to obtain the nano silicon dioxide coating for preventing the scale of the electric heating steam generating element.
Step 2 the diameter of the nanosilica 1 is 2.07 microns.
The ultrasonic frequency is 20kHz, the power is 1500W, the crushing time is measured in hours, the spacing between the stirring rod teeth is 15mm, and the rotating speed is 300 r.min in the analysis of single influence factors-1The concentration of the dispersant was 0.09 g.L-1。
The invention has the beneficial effects that: 200 parts of silicon dioxide particles 160-silted silica are sent into a crushing cylinder of an ultrasonic crusher, a proper amount of water and aluminum oxide are added, the diameters of the aluminum oxide powder are respectively 7 mm, 5mm, 3 mm and 2 mm, the mass ratio of the aluminum oxide powder is respectively 30%, 20% and 30%, the raw materials in the aluminum oxide powder are crushed by the acting forces of extrusion, shearing, impact and the like generated by mutual collision among grinding media, slurry with a certain concentration simultaneously generates cavitation under the action of an ultrasonic field to generate high-energy impact waves and micro-jet flows, 200 parts of the silicon dioxide particles 160-silted silica are synchronously crushed and dispersed, then particles with different particle sizes are separated by a high-efficiency grouping device, so that the homogenization and the specialization of the particle size distribution of the silicon dioxide powder are realized, the silicon dioxide 1 is obtained, and the silicon dioxide is dispersed in an organic solvent, adding a modifier, then carrying out surface treatment on the nano-silica by using 3-5 parts of mercaptosilane, 5-9 parts of vinyl silane and 10-20 parts of aminosilane coupling agent to obtain nano-silica 2, and independently preparing the nano-silica material, wherein the preparation method has low preparation cost, so that the preparation cost of the nano-silica coating is reduced, the trouble of a user is avoided, and the use of the user is facilitated, by adding a proper amount of water, hydrochloric acid, ethanol and 50-60 parts of hydroxyl silicone oil into a three-neck flask provided with a reflux device, starting stirring, heating the water bath to 55 ℃, then dropwise adding diphenyl diethoxy silane into the three-neck flask, after 20 minutes, dropwise adding a mixture of 20-30 parts of methyl triethoxy silane and 20-30 parts of ethyl orthosilicate, and reacting at the temperature for 1.5-2 hours, and then heating to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, reacting for 0.5 hour, stopping heating, naturally cooling, pouring into a separating funnel, standing to remove a small amount of sediment to obtain a low-surface-energy material, putting the low-surface-energy material into a container, adding nano-silica 2 to obtain a hydrophobic coating, wherein the obtained coating is hydrophobic and oleophobic and can resist the corrosion of part of organic solvents, and the problem that the traditional method lacks a systematic preparation method, and the preparation cost is greatly increased due to the fact that the nano-silica is obtained by external purchase is solved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A nano silicon dioxide coating for preventing scale of an electrothermal steam generating element is characterized by comprising the following raw materials in parts by weight: 200 parts of silicon dioxide particles 160, 3-5 parts of mercapto silane, 5-9 parts of vinyl silane, 10-20 parts of amino silane coupling agent, 50-60 parts of hydroxyl silicone oil, 20-30 parts of ethyl orthosilicate and 5-10 parts of dispersing agent.
2. The nano silicon dioxide coating for preventing the scale of the electrothermal steam generating element is characterized in that 5-10 parts of a dispersing agent is sodium dodecyl benzene sulfonate.
3. A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element is characterized by comprising the following steps:
1) 200 parts of silicon dioxide particles 160-;
2) dispersing the nano-silica prepared in the step 1 in an organic solvent, adding a modifier, and then carrying out surface treatment on the nano-silica by using 3-5 parts of mercapto silane, 5-9 parts of vinyl silane and 10-20 parts of amino silane coupling agent to obtain nano-silica 2;
3) adding 50-60 parts of water, hydrochloric acid, ethanol and hydroxy silicone oil into a three-necked bottle provided with a reflux device, starting stirring, heating to 55 ℃ in a water bath, dropwise adding diphenyl diethoxy silane into the mixture, dropwise adding a mixture of 20-30 parts of methyl triethoxysilane and ethyl orthosilicate after 20 minutes, reacting at the temperature for 1.5-2 hours after the addition is finished, heating to 80 ℃, reacting for 1.5 hours, adding hexamethyldisilazane with about 40 times of hydrochloric acid content to adjust the pH value to be neutral, stopping heating after 0.5 hour of reaction, naturally cooling, pouring into a separating funnel, standing, and removing a small amount of sediment to obtain a low-surface-energy material;
4) putting the low-surface-energy material prepared in the step (3) into a container, and adding the nano silicon dioxide 2 prepared in the step (2) to obtain a hydrophobic coating;
5) and (4) putting the hydrophobic coating prepared in the step (4) into a spraying device, spraying the hydrophobic coating to a position where the electric heating steam generating element is easy to generate scale, and solidifying to obtain the nano silicon dioxide coating for preventing the scale of the electric heating steam generating element.
4. A preparation method of a nano silicon dioxide coating for preventing scale of an electrothermal steam generating element is characterized in that the diameter of the nano silicon dioxide 1 in the step 2 is 2.07 microns.
5. A process for preparing the nano-class silicon dioxide coating used for preventing the scale of electrothermal steam generating element features that the ultrasonic waves used have frequency of 20kHz, power 1500W, and pulverizing time in hours, and when the single influence factor is analyzed, the distance between the stirring rods is 15mm and its rotation speed is 300 r.min-1The concentration of the dispersant was 0.09 g.L-1。
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