CN112175485A - Super-hydrophilic coating, heat exchanger and heat exchanger surface treatment method - Google Patents

Super-hydrophilic coating, heat exchanger and heat exchanger surface treatment method Download PDF

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CN112175485A
CN112175485A CN202011050144.XA CN202011050144A CN112175485A CN 112175485 A CN112175485 A CN 112175485A CN 202011050144 A CN202011050144 A CN 202011050144A CN 112175485 A CN112175485 A CN 112175485A
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heat exchanger
super
epoxy resin
hydrophilic
hydrophilic coating
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威廉·杰拉尔德·林恩
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Shanghai Fuli Refrigeration Equipment Co ltd
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Shanghai Fuli Refrigeration Equipment Co ltd
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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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • B05D1/00—Processes for applying liquids or other fluent materials
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    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
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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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • 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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    • 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
    • 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
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Abstract

The application relates to the technical field of heat exchangers, and discloses a super-hydrophilic coating, a heat exchanger and a heat exchanger surface treatment method, wherein the super-hydrophilic coating comprises 0.5-15% of super-hydrophilic nanoparticles, 1-10% of silica sol or epoxy resin and the rest of solvent; the super-hydrophilic nano particles are one or more of silicon dioxide, titanium dioxide and aluminum oxide; the silica sol is a silica solution formed by acid-catalyzed hydrolysis of silicate, and the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, polyphenol glycidyl ether epoxy resin, aliphatic glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin. The mode that uses super hydrophilic coating carries out super hydrophilic treatment to heat transfer surface material reaches to increase heat transfer surface moisture in order to promote heat exchange efficiency, has reduced the speed of frosting, alleviates heat transfer surface material simultaneously and is corroded by moisture and impurity in the air/rusty ization.

Description

Super-hydrophilic coating, heat exchanger and heat exchanger surface treatment method
Technical Field
The application relates to the technical field of heat exchangers, in particular to a super-hydrophilic coating, a heat exchanger and a heat exchanger surface treatment method.
Background
The heat exchanger (especially the heat exchanger for radiating the working liquid) conducts heat through the heat exchange surface of the solid medium in the radiating process, and if the heat exchange surface is provided with moisture in the process of radiating the gas, the heat exchange efficiency of the heat exchanger is enhanced. Since liquids and gases have higher heat transfer efficiency than solids and gases, water sprays on heat exchange surfaces or supplements moisture to the gas entering the heat exchanger are used in the related art.
In the related art, a water spray header is mainly adopted to moisten air or a heat exchange surface, wherein the evaporative condenser with the highest heat exchange efficiency has the advantage of water recoverability, but the production and installation of the evaporative condenser are difficult and the highest heat exchange efficiency is not reached.
In the related art, a method of wetting air entering a condenser by using a fiberboard is also available, but high heat exchange efficiency cannot be continuously achieved due to limited air wettability.
Operating for too long a time in an environment with high humidity in contact with water can damage the perishable heat exchange surface material. For preventing heat transfer surface material from being corroded/rusted by moisture and impurity in the air, the correlation technique uses hydrophilic coating to handle the heat transfer surface, heat transfer surface through hydrophilic treatment compares because of it has the adhesive layer on the surface with untreated heat transfer surface, so reduced the contact of moisture and impurity with heat transfer surface material, hydrophilic coating makes more condensation water drops stop on heat transfer surface because of it simultaneously, make the air carry out heat-conduction with the water drop when with heat transfer surface heat-conduction, in order to realize promoting heat exchange efficiency's effect, but the heat transfer surface that uses hydrophilic treatment can accelerate frosting speed in low temperature environment, can increase the defrosting frequency like this.
Disclosure of Invention
In order to relieve the corrosion/rust of impurities in water and air on the surface of the heat exchange, the effect of the heat exchange efficiency is improved, and the influence on the frosting speed is possibly reduced, the application discloses a super-hydrophilic coating, a heat exchanger and a heat exchanger surface treatment method.
On one hand, the super-hydrophilic coating provided by the application comprises the following technical scheme:
the super-hydrophilic coating comprises 0.5-15% of super-hydrophilic nano particles, 1-10% of silica sol or epoxy resin and the balance of solvent;
the super-hydrophilic nano particles are one or more of silicon dioxide, titanium dioxide and aluminum oxide;
the silica sol is a silica solution formed by acid-catalyzed hydrolysis of silicate, and the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, polyphenol glycidyl ether epoxy resin, aliphatic glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin;
the solvent comprises one or more of methanol, ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol, isopropanol, isobutanol, fluoroalkyl silane, cyclohexane, n-ethane, butyl acetate, acetone and dimethyl ethylamine.
Through adopting above-mentioned technical scheme, the effect that reaches after the composition combination makes the heat transfer surface produce the nanoparticle to make surface unevenness can hold more moisture simultaneously, consequently, the mode that uses super hydrophilic coating carries out super hydrophilic treatment to heat transfer surface material, reaches to increase heat transfer surface moisture in order to promote heat exchange efficiency, has reduced the speed of frosting, alleviates heat transfer surface material simultaneously and is corroded/rusty by impurity in moisture and the air.
In some embodiments, the superhydrophilic nanoparticle is silica.
By adopting the technical scheme, the silicon dioxide material and the silicon solution have stronger combination effect, and belong to silicon base.
In some embodiments, the superhydrophilic nanoparticle has 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 a second aspect, the heat exchanger 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, and the super-hydrophilic coating is arranged on the surface of the fins or the whole surface of the heat exchanger.
Through adopting above-mentioned technical scheme, the mode that uses super hydrophilic coating carries out super hydrophilic treatment to heat transfer surface material reaches to increase heat transfer surface moisture in order to promote heat exchange efficiency, has reduced the speed of frosting, alleviates heat transfer surface material simultaneously and is corroded/rusty by moisture and impurity in the air.
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.
On the other hand, the heat exchanger surface treatment method provided by the application comprises the following technical scheme:
the heat exchanger surface treatment method comprises the steps of immersing a heat exchanger into super-hydrophilic coating, wherein when the heat exchanger is immersed into the super-hydrophilic coating, fins are perpendicular to the liquid level, immersed at the speed of 2mm/s, placed in the super-hydrophilic coating for 5 s-2 min, taken out at the speed of 2mm/s, so that a uniform film layer is formed on the surface, and after film forming, the heat exchanger is naturally dried at room temperature for 0.5-24 h and/or baked at the temperature of 80-150 ℃ for 5-60 min.
The surface treatment method of the heat exchanger comprises the steps of spraying a coating on the heat exchanger by using a spray gun with the diameter of 0.5-1.5 mm at the low flow rate of 0.2pa so as to form a uniform film layer on the surface of the heat exchanger, forming the film layer by using the super-hydrophilic coating, and naturally drying for 0.5-24 hours at room temperature and/or baking for 5-60 minutes at the temperature of 80-150 ℃.
By adopting the technical scheme, before the coating is formed on the surface of the heat exchanger, the heat exchanger is immersed in acetone, ethanol and deionized water to clean the outer surface; then exposing the heat exchanger to 2mol hydrochloric acid solution for 15min to generate micro-scale roughness features; the heat exchanger was then placed in deionized water at 90 ℃ for 1h to produce a layer of aluminum hydroxide.
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 superhydrophilic coating.
Example 1:
the application example 1 discloses a super-hydrophilic coating, which consists of 0.5% of super-hydrophilic nanoparticles, 10% of silica sol and the balance of solvent. Wherein,
the super-hydrophilic nano particles are silicon dioxide particles with the particle size of 5-100 nm;
the silica sol is a silicon solution formed by acid-catalyzed hydrolysis of silicate;
the solvent is methanol.
The preparation method comprises the following steps: silica particles with the particle size of 5-100nm, silicon solution formed by acid-catalyzed hydrolysis of silicate and methanol are put into a high-speed mixer to be stirred, the mixture is put into a double-screw rod to be melted and extruded, and then the melted mixture is subjected to tabletting, crushing and screening to obtain the super-hydrophilic coating.
Example 2:
the application example 2 discloses a super-hydrophilic coating, which consists of 15% of super-hydrophilic nanoparticles, 1% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are titanium dioxide particles with the particle size of 5-100 nm;
the epoxy resin is bisphenol A type epoxy resin;
the solvent is ethyl acetoacetate.
The preparation method is as described in example 1, or the super-hydrophilic nanoparticles and the epoxy resin are dissolved in a solvent for ultrasonic dispersion for 15-60 minutes, and the super-hydrophilic coating is obtained after uniform mixing.
Example 3:
the application example 3 discloses a super-hydrophilic coating, which consists of 2% of super-hydrophilic nanoparticles, 8% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are silicon dioxide particles with the particle size of 5-100 nm;
the epoxy resin is polyphenol type glycidyl ether epoxy resin;
the solvent is potassium tert-butoxide.
The preparation is as described in example 1.
Example 4:
the application example 4 discloses a super-hydrophilic coating, which is composed of 4% of super-hydrophilic nanoparticles, 7% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are aluminum oxide particles with the particle size of 5-100 nm;
the epoxy resin is bisphenol F type epoxy resin;
the solvent is nitric acid.
Example 5:
the application example 5 discloses a super-hydrophilic coating, which is composed of 5% of super-hydrophilic nanoparticles, 6% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are silicon dioxide particles with the particle size of 5-100 nm;
the epoxy resin is aliphatic glycidyl ether epoxy resin;
the solvent is ethanol.
Example 6:
the application example 6 discloses a super-hydrophilic coating, which is composed of 5% of super-hydrophilic nanoparticles, 5% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are silicon dioxide particles with the particle size of 5-100 nm;
the epoxy resin is glycidyl ester type epoxy resin;
the solvent is isopropanol.
Example 7:
the application example 7 discloses a super-hydrophilic coating, which is composed of 6% of super-hydrophilic nanoparticles, 4% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are silicon dioxide particles with the particle size of 5-100 nm;
the epoxy resin is glycidyl amine type epoxy resin;
the solvent is isobutanol.
Example 8
The application example 8 discloses a super-hydrophilic coating, which consists of 7% of super-hydrophilic nanoparticles, 3% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are mixed particles of silicon dioxide and aluminum oxide with the particle size of 5-100nm, and the mixing ratio of the silicon dioxide to the aluminum oxide is 1: 1;
the epoxy resin is bisphenol A epoxy resin or bisphenol F epoxy resin, and the weight ratio of the epoxy resin to the bisphenol A epoxy resin to the bisphenol F epoxy resin is 1:1 in proportion;
the solvent is a fluoroalkyl silane.
Example 9
Example 9 of the present application discloses a superhydrophilic coating consisting of 0.5% superhydrophilic nanoparticles, 8% epoxy resin, and the remaining amount of solvent. Wherein,
the super-hydrophilic nano particles are mixed particles of silicon dioxide and titanium dioxide with the particle size of 5-100nm, and the mixing ratio of the silicon dioxide to the titanium dioxide is 1: 1;
the epoxy resin is polyphenol type glycidyl ether epoxy resin and aliphatic glycidyl ether epoxy resin, and the weight ratio of the epoxy resin to the aliphatic glycidyl ether epoxy resin is 1:1 in proportion;
the solvent is cyclohexane.
Example 10
The application example 10 discloses a super-hydrophilic coating, which is composed of 0.5% of super-hydrophilic nanoparticles, 7% of epoxy resin and the balance of solvent. Wherein,
the super-hydrophilic nano particles are mixed particles of titanium dioxide and aluminum oxide with the particle size of 5-100nm, and the mixing ratio of the titanium dioxide to the aluminum oxide is 1: 1;
the epoxy resin is glycidyl ester type epoxy resin and glycidyl amine type epoxy resin, and the weight ratio of the epoxy resin to the glycidyl ester type epoxy resin is 1:1 in proportion;
the solvent is n-ethane, butyl acetate, acetone and dimethyl ethylamine according to the weight ratio of 1: 1: 1: 1.
The products obtained in the above examples 1 to 10 were tested for performance by using the salt spray test of GBT10125-1997 artificial atmosphere corrosion test, GB/T26490-2011 static water contact angle/water rolling angle test, and GB1720-79 adhesion test. The test results are shown in table 1:
table 1 performance test structure:
Figure BDA0002709300700000081
Figure BDA0002709300700000091
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 is subjected to super-hydrophilic treatment, the super-hydrophilic coating is coated, and the surface subjected to super-hydrophilic treatment is required to reach a stable contact angle below 5 degrees.
Besides, the super-hydrophilic coating can also be used for finless evaporative condensers only with coil pipes and finned single-pipe fins of evaporative condensers.
The application also discloses a surface treatment method of the heat exchanger, which comprises the following steps:
surface treatment before film formation:
immersing the heat exchanger in acetone, ethanol and deionized water to clean the outer surface; then exposing the heat exchanger to 2mol hydrochloric acid solution for 15min to generate micro-scale roughness features; the heat exchanger was then placed in deionized water at 90 c for 1 hour to produce a layer of aluminum hydroxide, thereby growing a surface with micro-and nano-scale roughness features that help promote superhydrophilicity.
The superhydrophilic heat exchanger was then set aside for characterization and testing. To recirculate the fluid, the heat exchanger is frequently agitated during the high effervescence etching step and then immersed in an initially boiling water vessel and agitated to remove any air bubbles trapped between the fins to prevent the formation of uneven surface areas.
A 2.5nm thick conformal layer of HTMS (heptadecafluorodecyltriethoxysilane) was deposited on the surface of the superhydrophilic heat exchanger using Chemical Vapor Deposition (CVD) at atmospheric pressure. Toluene was used as a carrier gas for the CVD process (HTMS to toluene ratio 1:19) and the heat exchanger was placed in the CVD chamber for 3 hours.
Film forming:
immersing the fin 2 before assembly or the heat exchanger after assembly into the super-hydrophilic coating, immersing the fin 1 perpendicular to the liquid level at the speed of 2mm/s when the heat exchanger is immersed into the super-hydrophilic coating, placing the fin in the coating for 5-2 min, wherein the specific immersion time is determined according to the adhesion condition of the coating and is generally about 1min, and taking out the fin at the speed of 2mm/s, so that a uniform film layer is formed on the surface of the substrate.
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 ℃.
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-hydrophilic particles, and baking in an oven at 400 deg.C for 10 min. After the super hydrophilic 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.
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-hydrophilic coating is characterized by comprising 0.5-15% of super-hydrophilic nano particles, 1-10% of silica sol or epoxy resin and the balance of solvent;
the super-hydrophilic nano particles are one or more of silicon dioxide, titanium dioxide and aluminum oxide;
the silica sol is a silica solution formed by acid-catalyzed hydrolysis of silicate, and the epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, polyphenol glycidyl ether epoxy resin, aliphatic glycidyl ether epoxy resin, glycidyl ester epoxy resin and glycidyl amine epoxy resin;
the solvent comprises one or more of methanol, ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol, isopropanol, isobutanol, fluoroalkyl silane, cyclohexane, n-ethane, butyl acetate, acetone and dimethyl ethylamine.
2. The superhydrophilic coating of claim 1, wherein the superhydrophilic nanoparticles are silica.
3. The superhydrophilic coating of claim 1, wherein the particle size of the superhydrophilic nanoparticles is 5-100 nm.
4. 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-hydrophilic coating as claimed in any one of claims 1 to 3.
5. The heat exchanger according to claim 4, characterized in that the fins (1) are sinusoidal corrugated plates.
6. Heat exchanger according to claim 5, characterized in that each fin (1) is provided with longitudinal vortex generators (11).
7. Heat exchanger according to any of claims 4 to 6, wherein adjacent tube bundles (2) are arranged in a sinusoidal staggered arrangement.
8. The heat exchanger surface treatment method is characterized in that the heat exchanger of claim 7 is immersed in the super-hydrophilic coating of any one of claims 1 to 3, when the heat exchanger is immersed in the super-hydrophilic coating, the fins (1) are immersed in the super-hydrophilic coating at a speed of 2mm/s and perpendicular to the liquid level, the super-hydrophilic coating is placed for 5s to 2min, then the fins are taken out at a speed of 2mm/s, so that a uniform film layer is formed on the surface, and after film forming, the film is naturally dried at room temperature for 0.5 to 24h and/or baked at 80 to 150 ℃ for 5 to 60 min.
9. The surface treatment method of the heat exchanger is characterized in that a spray gun with the caliber of 0.5mm-1.5mm is used, a coating is sprayed on the heat exchanger according to claim 7 at the pressure of 0.2pa and the low flow rate, so that a uniform film layer is formed on the surface of the heat exchanger, the film layer is the super-hydrophilic coating according to any one of claims 1-3, and after the film is formed, the film is naturally dried for 0.5-24 hours at room temperature and/or baked for 5-60 minutes at the temperature of 80-150 ℃.
10. The heat exchanger surface treatment method according to claim 8 or 9, wherein the heat exchanger is immersed in acetone, ethanol and deionized water to clean the outer surface before the coating layer is formed on the surface of the heat exchanger; then exposing the heat exchanger to 2mol hydrochloric acid solution for 15min to generate micro-scale roughness features; the heat exchanger was then placed in deionized water at 90 ℃ for 1h to produce a layer of aluminum hydroxide.
CN202011050144.XA 2020-09-29 2020-09-29 Super-hydrophilic coating, heat exchanger and heat exchanger surface treatment method Pending CN112175485A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114260165A (en) * 2021-12-24 2022-04-01 江苏金天辰新材料有限公司 High-corrosion-resistance hydrophilic aluminum foil based on renewable resources and processing device thereof
CN114754606A (en) * 2021-01-08 2022-07-15 杭州三花研究院有限公司 Heat exchanger and preparation method thereof
CN115466424A (en) * 2022-09-28 2022-12-13 深圳市英维克科技股份有限公司 Hydrophilic treatment method for plastic surface and heat exchanger core

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1410721A (en) * 2001-09-24 2003-04-16 广东科龙电器股份有限公司 Manufacturing method of super hydrophili finned sheet and air conditioning heat exchanger
CN1752708A (en) * 2005-10-31 2006-03-29 西安交通大学 Heat exchanger with internal and external finned tubes
CN101781506A (en) * 2010-02-04 2010-07-21 复旦大学 self-cleaning epoxy resin anti-fog coating
CN106179916A (en) * 2016-08-27 2016-12-07 合肥普庆新材料科技有限公司 A kind of preparation method of freezing coated aluminum foil
CN106833294A (en) * 2017-02-09 2017-06-13 合肥英索莱特新材料科技有限公司 Aqueous epoxide resin paint
CN106882468A (en) * 2017-04-10 2017-06-23 滁州卷烟材料厂 A kind of nanometer is coated with water proof anti-soil corrugated case
CN109294394A (en) * 2018-09-21 2019-02-01 华东理工大学 A kind of superhydrophilic self-cleaning epoxy coating and the preparation method and application thereof
CN109535780A (en) * 2017-08-15 2019-03-29 中国科学院上海硅酸盐研究所 A kind of super hydrophilic silica coat and preparation method thereof
CN209756716U (en) * 2019-03-28 2019-12-10 空调国际(上海)有限公司 Anti-frosting heat exchanger

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1410721A (en) * 2001-09-24 2003-04-16 广东科龙电器股份有限公司 Manufacturing method of super hydrophili finned sheet and air conditioning heat exchanger
CN1752708A (en) * 2005-10-31 2006-03-29 西安交通大学 Heat exchanger with internal and external finned tubes
CN101781506A (en) * 2010-02-04 2010-07-21 复旦大学 self-cleaning epoxy resin anti-fog coating
CN106179916A (en) * 2016-08-27 2016-12-07 合肥普庆新材料科技有限公司 A kind of preparation method of freezing coated aluminum foil
CN106833294A (en) * 2017-02-09 2017-06-13 合肥英索莱特新材料科技有限公司 Aqueous epoxide resin paint
CN106882468A (en) * 2017-04-10 2017-06-23 滁州卷烟材料厂 A kind of nanometer is coated with water proof anti-soil corrugated case
CN109535780A (en) * 2017-08-15 2019-03-29 中国科学院上海硅酸盐研究所 A kind of super hydrophilic silica coat and preparation method thereof
CN109294394A (en) * 2018-09-21 2019-02-01 华东理工大学 A kind of superhydrophilic self-cleaning epoxy coating and the preparation method and application thereof
CN209756716U (en) * 2019-03-28 2019-12-10 空调国际(上海)有限公司 Anti-frosting heat exchanger

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754606A (en) * 2021-01-08 2022-07-15 杭州三花研究院有限公司 Heat exchanger and preparation method thereof
CN114754606B (en) * 2021-01-08 2023-08-11 杭州三花研究院有限公司 Heat exchanger and preparation method thereof
CN114260165A (en) * 2021-12-24 2022-04-01 江苏金天辰新材料有限公司 High-corrosion-resistance hydrophilic aluminum foil based on renewable resources and processing device thereof
CN115466424A (en) * 2022-09-28 2022-12-13 深圳市英维克科技股份有限公司 Hydrophilic treatment method for plastic surface and heat exchanger core

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