CN112048243A - Super-hydrophobic coating agent, heat exchanger and heat exchanger surface treatment method - Google Patents
Super-hydrophobic coating agent, heat exchanger and heat exchanger surface treatment method Download PDFInfo
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- CN112048243A CN112048243A CN202010890826.5A CN202010890826A CN112048243A CN 112048243 A CN112048243 A CN 112048243A CN 202010890826 A CN202010890826 A CN 202010890826A CN 112048243 A CN112048243 A CN 112048243A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
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- 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
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- 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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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 application relates to the technical field of heat exchangers and discloses a super-hydrophobic coating agent, a heat exchanger and a heat exchanger surface treatment method. The defrosting device can reduce defrosting energy consumption and defrosting time, so that the heat exchanger can work without stop, and meanwhile, the corrosion on the surface of the heat exchanger is delayed and reduced.
Description
Technical Field
The application relates to the technical field of heat exchangers, in particular to a super-hydrophobic coating agent, a heat exchanger and a heat exchanger surface treatment method.
Background
The heat exchanger, especially the heat exchanger that cools air, can adsorb the moisture in the humid air at the heat exchanger surface in the cooling process, when the literary sketch on heat exchanger surface drops to below humid air dew point temperature, the humid air begins to condense at the heat exchanger surface, after condensing enough many moisture, can fall with the form of comdenstion water from the heat exchanger surface, reaches below 0 ℃ in the heat exchanger internal temperature, and the comdenstion water is when piling up too much on the heat exchanger surface, then can be at the heat exchanger surface frost. Excessive frost between heat exchange surfaces of the heat exchanger can reduce heat exchange efficiency and improve pressure drop, and when frost is formed between the heat exchange surfaces and completely blocks wind passing, the heat exchanger needs to be defrosted completely.
In the related art, there is a method for increasing the amount of frost formation that can be carried by a heat exchanger by increasing the distance between heat exchange surfaces. When the inlet air temperature is lower than 0 degree in the use working condition of the heat exchanger, the heat exchanger with different heat exchange surface intervals can be configured according to the use working condition, so that the defrosting frequency which is the same as the higher temperature can be achieved in the low-temperature environment with higher frosting speed, but the heat exchange area and the heat exchange efficiency of the heat exchanger with the same size can be reduced by the mode.
There is also a related art to defrost a heat exchanger by means of active defrosting. The active defrosting mode comprises the following steps: the defrosting method comprises the following steps of defrosting by an electric heating pipe, hot defrosting, glycol (propylene glycol) defrosting and water defrosting, wherein the defrosting effect is realized by heating a heat exchanger. However, the active defrosting method requires intermittent shutdown of the heat exchanger, which results in loss of heat exchange efficiency during the shutdown period and use of a large amount of energy consumption, and the heat generated by defrosting also affects the working environment of the heat exchanger. In addition, the water defrosting mode increases the environmental humidity and is limited by the environmental temperature of the heat exchanger, and the water defrosting mode cannot be used in the environment with too low temperature.
Disclosure of Invention
In order to reduce defrosting energy consumption and defrosting time, reach the effect of passive frost prevention, reduce the influence to heat transfer area and heat exchange efficiency simultaneously, this application provides a super hydrophobic coating agent and has the heat exchanger of this super hydrophobic coating agent.
The super-hydrophobic coating agent provided by the application comprises the following technical scheme:
the super-hydrophobic coating agent comprises 0.5-15% of super-hydrophobic nano particles, 1-15% of hydrophobic resin and the balance of solvent;
the super-hydrophobic nano-particles are one or a mixture of more than two of silicon dioxide, titanium dioxide and aluminum oxide;
the solvent comprises one or a mixture of more than two of ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol, fluoroalkyl silane, cyclohexane, n-ethane, butyl acetate, acetone and dimethyl ethylamine.
Through adopting above-mentioned technical scheme, super hydrophobic coating agent adhesion property is stronger, can not take place the coating in the long-term use and drop, covers and locates the heat exchanger heat transfer surface, not only can reach passive frost prevention's effect, reduces the influence to heat transfer area and heat exchange efficiency simultaneously.
In some embodiments, the superhydrophobic nanoparticle is aluminum oxide.
The surface used by the coating is mainly made of aluminum, and by adopting the technical scheme, the aluminum oxide serving as the super-hydrophobic nano particles is more favorable for maintaining the long-term adhesiveness of the aluminum material, and in addition, the aluminum oxide is more favorable for heat transfer relative to silicon dioxide, and the heat transfer efficiency cannot be influenced by using the coating.
In some embodiments, the superhydrophobic nanoparticles have a particle size of 5-100 nm.
If the particle is too small, a rough surface cannot be formed, and if the particle is too large, hydrophobicity is affected.
In some embodiments, the hydrophobic resin is a silicone resin.
The organic silicon resin has the strongest hydrophobic property, and the technical scheme is adopted, so that the nano material is better synergistic.
The super-hydrophobic coating agent provided by the application comprises the following technical scheme:
the heat exchanger comprises a plurality of parallel fins arranged side by side and a plurality of tube bundles vertically penetrating through the fins, wherein the super-hydrophobic coating agent coating is arranged on the overall surface of the fins or the heat exchanger, and the surface of the fins provided with the super-hydrophobic coating agent coating is required to reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees.
Through adopting above-mentioned technical scheme, set up above-mentioned super hydrophobic coating agent coating at the heat exchanger heat transfer surface, make the heat transfer surface have the performance of changing the deicing, make the heat exchanger realize the effect of not stop work, reduce the defrosting pipeline in a large number or defrosting frequency, in addition, also postpone and reduce the corrosion on heat exchanger surface. In addition, the 150 ° + stable contact angle and the 10 ° -rolling contact angle are superhydrophobic surfaces, which have anti-frost and anti-icing properties, and frost formation is retarded when the superhydrophobic surfaces are used.
In some embodiments, the fins are sinusoidal corrugated plates.
Through adopting above-mentioned technical scheme, through the shape on fin surface, make and have more heat transfer surfaces in the heat exchanger of equidimension, consequently, heat transfer area and the heat exchange efficiency of heat exchanger all can promote.
In some embodiments, a longitudinal vortex generator is disposed on each fin.
By adopting the technical scheme, the longitudinal vortex generator is installed, so that when fluid on the gas side passes through the longitudinal vortex generator, the gas is separated from the longitudinal vortex generator due to friction, and under the driving of pressure difference, strong longitudinal rotation is formed and the fluid develops downstream. The existence of the longitudinal vortex breaks the development of a gas side fluid boundary layer, causes the macroscopic mixing of the fluid, increases the turbulence degree, has good heat exchange strengthening effect, can ensure that the longitudinal vortex has small change of the flow direction speed and small increase of the resistance loss, and obviously improves the performance of the heat exchanger.
In some embodiments, adjacent tube bundles are staggered sinusoidally.
By adopting the technical scheme, more working liquid can pass through the tube bundle discharge mode in the heat exchanger with the same size, so that higher heat exchange efficiency and heat transfer coefficient are achieved.
In some embodiments, a shell is arranged outside the heat exchanger, the surface of the shell is provided with the super-hydrophobic coating agent coating, the surface of the fin provided with the super-hydrophobic coating agent coating is required to reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees, and the shell is made of stainless steel or aluminum magnesium alloy.
By adopting the technical scheme, the surface of the shell is not easy to frost, and the stainless steel and the aluminum magnesium alloy are preferred because the stainless steel and the aluminum magnesium alloy are not easy to corrode and can still be used in the environment of food/medicine processing grade after being contacted with moisture for a long time.
The application provides a heat exchanger surface treatment method, which comprises the following technical scheme:
the heat exchanger is immersed in the super-hydrophobic coating agent, and when the heat exchanger is immersed in the super-hydrophobic coating agent, the fins are vertical to the liquid level.
By adopting the technical scheme, the generated contact angle is far larger than 150 degrees, so that the super-hydrophobic coating is formed conveniently.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the heat transfer coefficient k value of the heat exchanger is increased by performing super-hydrophobic treatment on the heat exchange surface of the heat exchanger, and the effect of increasing the ratio of the k value to the pressure drop delta p is also achieved;
2. the heat exchange surface of the heat exchanger is subjected to super-hydrophobic treatment, so that the defrosting energy consumption and the defrosting time are obviously reduced, and the effect of non-stop work of the heat exchanger is realized;
3. the corrosion of the surface of the heat exchanger is delayed and reduced by carrying out super-hydrophobic treatment on the heat exchange surface of the heat exchanger.
Drawings
FIG. 1 is a schematic diagram of a fin and tube bundle configuration in a heat exchanger disclosed herein;
FIG. 2 is a side view of a fin and tube bundle in a heat exchanger disclosed herein.
Reference numerals: 1. a fin; 2. a tube bundle; 11. a longitudinal vortex generator.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The present application first discloses a super-hydrophobic coating agent.
Example 1:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 0.5% of super-hydrophobic nano-particles, 15% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are silicon dioxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is ethyl acetoacetate and nitric acid.
The preparation method comprises the following steps: and putting the super-hydrophobic nano particles, the hydrophobic resin and the solvent into a high-speed mixer, stirring, putting the mixture into a double-screw rod for melting and extruding, and tabletting, crushing and screening the melted mixture to obtain the super-hydrophobic coating.
Example 2:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 2.5% of super-hydrophobic nano-particles, 13% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are titanium dioxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of potassium tert-butoxide and ethanol in a mass ratio of 1: 1.
The preparation method is as described in example 1, or the superhydrophobic coating is obtained by dissolving the superhydrophobic nanoparticles and the hydrophobic resin in a solvent, performing ultrasonic dispersion for 15-60 minutes, and mixing uniformly.
Example 3:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 7.5% of super-hydrophobic nano-particles, 8% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are aluminum oxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of ethyl acetoacetate and nitric acid in a mass ratio of 1: 1.
In order to prevent the hydrolysis of butoxide too fast due to Al (OH)3 precipitation, a chelating agent (ethyl acetoacetate) should be dissolved in water prior to butanol addition, instead of butanol, to slow down the hydrolysis rate. To obtain a good particle size distribution of the suspension, which must be kept below 100nm to cause the formation of nanoparticles and avoid aggregation, a nitric acid solution is gradually added to the mixture. The protons bind to and charge the surface of the forming particles, thereby stabilizing them and avoiding aggregation. After 24 hours at 70 ℃, a clear sol (pH 3.64) was obtained. And stirring and adding hydrophobic resin into the transparent sol to obtain the super-hydrophobic coating.
Example 4:
example 1 of the present application discloses a superhydrophobic coating agent consisting of 5% superhydrophobic nanoparticles, 10% hydrophobic resin, and the remaining amount of solvent, wherein,
the super-hydrophobic nano-particles are a mixture of aluminum oxide particles and silicon dioxide particles in a mass ratio of 1: 1; the grain diameters of the aluminum oxide particles and the silicon dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin,
the solvent is a mixture of n-ethane and butyl acetate in a mass ratio of 1: 1.
The preparation is as described in example 2.
Example 5:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 10% of super-hydrophobic nano-particles, 5% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are a mixture of aluminum oxide particles and titanium dioxide particles in a mass ratio of 1:1, and the particle size of the aluminum oxide particles and the particle size of the titanium dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of acetone and dimethylethylamine in a mass ratio of 1: 1.
The preparation is as described in example 2.
Example 6:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 12% of super-hydrophobic nano-particles, 3% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are a mixture of silicon dioxide particles and titanium dioxide particles in a mass ratio of 1:1, and the particle size of the silicon dioxide particles and the particle size of the titanium dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol and fluoroalkyl silane in a mass ratio of 1:1:1: 1.
The preparation is as described in example 2.
Example 7:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 15% of super-hydrophobic nano-particles, 1% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are prepared from the following components in a mass ratio of 1:1, the particle size of the silicon dioxide particles, the titanium dioxide particles and the aluminum oxide particles is 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of cyclohexane, n-ethane, butyl acetate, acetone and dimethylethylamine in a mass ratio of 1:1:1: 1.
The preparation is as described in example 2.
The performance test is carried out on the products obtained in the above examples 1 to 7, and the test method adopts GBT10125-1997 artificial atmosphere corrosion test salt spray test, GB/T26490-2011 static water contact angle/water rolling angle test, GB1720-79 adhesion test, GB1732-79 impact strength test and GB1731-79 flexibility test. The test results are shown in table 1:
table 1 performance test structure:
the application also discloses a heat exchanger, as shown in fig. 1 and 2, comprising a plurality of parallel fins 1 arranged side by side, a plurality of tube bundles 2 vertically penetrating the fins 1, and a shell (not shown in the figure) positioned outside the tube bundles 2 of the fins 1, wherein the shell is made of stainless steel or aluminum-magnesium alloy. As shown in fig. 2, in this embodiment of the present application, fin 2 is the sinusoidal corrugated plate, and after fin 2 set up side by side, the crest of every fin 2 aligns with the crest, and the trough aligns with the trough to more heat transfer surfaces have in making the heat exchanger of equidimension, promote heat transfer area and heat exchange efficiency of heat exchanger. The tube bundles 2 are arranged in a sine curve staggered mode, so that more working liquid can pass through the heat exchanger with the same size, and higher heat exchange efficiency and heat transfer coefficient are achieved. The surface of each fin 2 is distributed with longitudinal vortex generators 11, the longitudinal vortex generators 11 are arc triangles, the included angle between the longitudinal vortex generators 11 and the incoming flow is 30 degrees, the influence on the pressure difference on the fluid power is minimum under the angle, and the heat exchange efficiency of the generated longitudinal vortex pair is improved to the maximum. The longitudinal vortex generators 11 are adhered to the fins 2 or are punched directly from the fins 2. The longitudinal vortex generators 11 are installed such that when the fluid on the gas side passes through the longitudinal vortex generators 11, the gas is separated from the longitudinal vortex generators 11 due to friction, and driven by the pressure difference, strong longitudinal rotation is formed and developed downstream. The existence of the longitudinal vortex breaks the development of a gas side fluid boundary layer, causes the macroscopic mixing of the fluid, increases the turbulence degree, has good heat exchange strengthening effect, can ensure that the longitudinal vortex has small change of the flow direction speed and small increase of the resistance loss, and obviously improves the performance of the heat exchanger. The fin 1 of the heat exchanger or the whole surface of the heat exchanger disclosed by the application is coated with the super-hydrophobic coating agent through super-hydrophobic treatment, and the surface after the super-hydrophobic treatment should reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees.
The application also discloses a surface treatment method of the heat exchanger, which comprises the following steps: and immersing the fin 2 before assembly or the whole assembled heat exchanger into the super-hydrophobic coating agent, wherein when the heat exchanger is immersed into the super-hydrophobic coating agent, the fin 1 is perpendicular to the liquid level, is immersed at the speed of 2mm/s, is placed in the coating for 5-2 min, and is taken out at the speed of 2mm/s, so that a uniform film layer is formed on the surface of the substrate.
And (3) film formation post-treatment:
performing auxiliary drying heat treatment for 60min at 400 deg.C in a baking facility, standing in boiling water for 30min to form petal-shaped super-hydrophobic particles, and baking in an oven at 400 deg.C for 10 min. After the super-hydrophobic surface treatment, the substrate can be immersed in the fluoroalkyl silane solution for 2min, taken out at a speed of 2mm/s and baked at 150 ℃ for 30min to reduce the surface energy.
In other embodiments of the present application, the surface treatment can be performed by spraying, i.e., a coating is sprayed by a 0.5mm to 1.5mm caliber spray gun at a low flow rate under a pressure of 0.2pa, so that a uniform film layer is formed on the surface of the substrate. In this case, the post-film formation treatment method is: drying for 0.5-24 hours at the natural room temperature and/or carrying out auxiliary drying heat treatment for 5-60 min by using a baking facility, wherein the temperature of the auxiliary drying treatment is controlled at 80-150 ℃.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The super-hydrophobic coating agent is characterized by comprising 0.5-15% of super-hydrophobic nano particles, 1-15% of hydrophobic resin and the balance of solvent;
the super-hydrophobic nano-particles are one or a mixture of more than two of silicon dioxide, titanium dioxide and aluminum oxide;
the solvent comprises one or a mixture of more than two of ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol, fluoroalkyl silane, cyclohexane, n-ethane, butyl acetate, acetone and dimethyl ethylamine.
2. The superhydrophobic coating agent of claim 1, wherein the superhydrophobic nanoparticles are aluminum oxide.
3. The superhydrophobic coating agent according to claim 1, wherein the superhydrophobic nanoparticles have a particle size of 5-100 nm.
4. The superhydrophobic coating agent according to claim 1, wherein the hydrophobic resin is a silicone resin.
5. The heat exchanger comprises a plurality of parallel fins (1) arranged side by side and a plurality of tube bundles (2) vertically penetrating through the fins (1), and is characterized in that the whole surface of the fins (1) or the heat exchanger is provided with the super-hydrophobic coating agent coating layer according to any one of claims 1 to 4, and the surface of the fins (1) provided with the super-hydrophobic coating agent coating layer is required to reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees.
6. The heat exchanger according to claim 5, characterized in that the fins (1) are sinusoidal corrugated plates.
7. Heat exchanger according to claim 6, characterized in that each fin (1) is provided with longitudinal vortex generators (11).
8. Heat exchanger according to any of claims 5 to 7, wherein adjacent tube bundles (2) are arranged in a sinusoidal staggered arrangement.
9. The heat exchanger according to claim 8, characterized in that a shell is arranged outside the heat exchanger, the surface of the shell is provided with the super-hydrophobic coating agent coating according to any one of claims 1 to 4, the surface of the fin (1) provided with the super-hydrophobic coating agent coating is required to reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees, and the shell is made of stainless steel or aluminum-magnesium alloy.
10. The method for treating the surface of the heat exchanger is characterized in that the heat exchanger according to claim 8 is immersed in the super-hydrophobic coating agent according to any one of claims 1 to 4, when the heat exchanger is immersed in the super-hydrophobic coating agent, the fins (1) are immersed at a speed of 2mm/s and perpendicular to the liquid level, the heat exchanger is placed in the coating for 5s to 2min, and then the heat exchanger is taken out at a speed of 2mm/s, so that a uniform film layer is formed on the surface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930129A (en) * | 2021-11-04 | 2022-01-14 | 武汉理工大学 | Nano coating, heat exchanger and coating method |
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| CN113930129A (en) * | 2021-11-04 | 2022-01-14 | 武汉理工大学 | Nano coating, heat exchanger and coating method |
| CN113930129B (en) * | 2021-11-04 | 2022-11-15 | 武汉理工大学 | Nano coating, heat exchanger and coating method |
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