CN114539921B - Evaporator based on super-hydrophilic coating and hydrophobic coating and preparation method and application thereof - Google Patents
Evaporator based on super-hydrophilic coating and hydrophobic coating and preparation method and application thereof Download PDFInfo
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- CN114539921B CN114539921B CN202210050985.3A CN202210050985A CN114539921B CN 114539921 B CN114539921 B CN 114539921B CN 202210050985 A CN202210050985 A CN 202210050985A CN 114539921 B CN114539921 B CN 114539921B
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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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
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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
- B05D7/146—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 to metallic pipes or tubes
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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
- B05D7/22—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 internal surfaces, e.g. of tubes
- B05D7/222—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 internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
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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
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
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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
- B05D2202/25—Metallic substrate based on light metals based on Al
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses an evaporator based on a super-hydrophilic coating and a hydrophobic coating, and a preparation method and application thereof. The evaporator based on the super-hydrophilic coating and the hydrophobic coating comprises a coil and fins, wherein the outer surface of the coil is provided with the hydrophobic coating for delaying frost formation on the outer surface of the coil, the inner surface of the coil is provided with the super-hydrophilic coating for assisting a refrigerant to diffuse in the coil, a part of area of the surface of the fins is provided with the hydrophobic coating for delaying frost formation on the surface of the fins, and a part of area of the surface of the fins is provided with the super-hydrophilic coating for gathering and collecting liquid drops formed in the melting process of the frost layer on the outer surface of the coil and the surface of the fins. The evaporator based on the super-hydrophilic coating and the hydrophobic coating has the advantages of high refrigeration efficiency, difficult frosting and icing on the surface, simple manufacturing process and low manufacturing cost, and is suitable for large-area popularization and application in the field of household refrigerators.
Description
Technical Field
The invention relates to the technical field of household refrigerators, in particular to an evaporator based on a super-hydrophilic coating and a hydrophobic coating and a preparation method and application thereof.
Background
An air-cooled refrigerator is a common household refrigerator at present, and comprises one or more fin evaporators, wherein heat in a storage space is taken away by evaporation of a refrigerant in the evaporators, so that the aim of refrigeration is fulfilled. However, when the air-cooled refrigerator runs for a long time, the outer surface of the evaporator is easy to frost and freeze, and further heat exchange between the refrigerant and air is blocked, and finally the refrigeration efficiency of the air-cooled refrigerator is obviously reduced. At present, researchers mainly dissolve a frost layer formed on the outer surface of an evaporator by arranging a timed heating defrosting device in a refrigerator, but because the heating time is usually too short, the frost layer is not completely dissolved, formed liquid drops can be dispersed and condensed, water drops generated by the dissolution of the frost layer can be re-solidified when the refrigerator refrigerates again, and even a frost layer with poorer heat exchange capacity can be formed. Meanwhile, because the refrigerant cannot completely fill the inside of the evaporator coil, the inner surface of the evaporator is not fully utilized, the evaporation speed of the liquid is limited, and the overall refrigeration efficiency of the air-cooled refrigerator is finally influenced.
Therefore, it is highly desirable to develop an evaporator for a refrigerator, which has high cooling efficiency and a surface that is not easily frosted and frozen.
Disclosure of Invention
The invention aims to provide an evaporator based on a super-hydrophilic coating and a hydrophobic coating, and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
an evaporator based on a super-hydrophilic coating and a hydrophobic coating comprises a coil and fins; the outer surface of the coil is provided with a hydrophobic coating, the inner surface of the coil is provided with a super-hydrophilic coating, the hydrophobic coating on the outer surface of the coil is used for delaying the formation of a frost layer on the outer surface of the coil, and the super-hydrophilic coating on the inner surface of the coil is helpful for the diffusion of a refrigerant in the coil; the hydrophobic coating on the surface of the fin is used for delaying the formation of the frost layer on the surface of the fin, the super-hydrophilic coating on the surface of the fin is used for gathering liquid drops formed in the melting process of the outer surface of the collecting coil and the frost layer on the surface of the fin.
Preferably, the coil pipe is made of aluminum alloy.
Preferably, the fin is made of aluminum alloy.
Preferably, the thickness of the super-hydrophilic coating is 0.1 to 0.5 μm.
Preferably, the thickness of the hydrophobic coating is 0.1 μm to 0.5 μm.
A preparation method of an evaporator based on a super-hydrophilic coating and a hydrophobic coating comprises the following steps:
1) Soaking the aluminum alloy coil pipe and the aluminum alloy fins in a sodium hydroxide solution, and then soaking in boiling water to obtain the coil pipe with the super-hydrophilic coating and the fins with the super-hydrophilic coating;
2) Sealing two ends of the coil pipe treated in the step 1), soaking the coil pipe in a dispersion liquid containing a hydrophobic substance, taking out the coil pipe and drying the coil pipe to obtain the coil pipe of which the outer surface is provided with a hydrophobic coating and the inner surface is provided with a super-hydrophilic coating; covering and protecting partial area of the surface of the fin treated in the step 1), soaking the partial area by using dispersion liquid containing a hydrophobic substance, taking out the partial area and drying the partial area to obtain the fin with the hydrophobic coating arranged on the partial area of the surface and the super-hydrophilic coating arranged on the partial area;
3) Assembling the coil pipe treated in the step 2) and the fin treated in the step 2) to obtain the evaporator based on the super-hydrophilic coating and the hydrophobic coating.
Preferably, a method for preparing an evaporator based on a super-hydrophilic coating and a hydrophobic coating comprises the following steps:
1) Polishing an aluminum alloy coil and an aluminum alloy fin, then washing with water and alcohol, soaking with a sodium hydroxide solution, and soaking with boiling water to obtain the coil provided with the super-hydrophilic coating and the fin provided with the super-hydrophilic coating;
2) Sealing the two ends of the coil pipe treated in the step 1), soaking the coil pipe in a dispersion liquid containing a hydrophobic substance, taking out the coil pipe, and cleaning and drying the surface of the coil pipe to obtain the coil pipe with a hydrophobic coating on the outer surface and a super-hydrophilic coating on the inner surface; covering and protecting partial area of the surface of the fin treated in the step 1), soaking the partial area by using a dispersion liquid containing a hydrophobic substance, taking out the partial area, and cleaning and drying the surface to obtain the fin with a hydrophobic coating arranged in the partial area and a super-hydrophilic coating arranged in the partial area on the surface;
3) Assembling the coil pipe treated in the step 2) and the fin treated in the step 2) to obtain the evaporator based on the super-hydrophilic coating and the hydrophobic coating.
Preferably, the sodium hydroxide solution is used for soaking for 5min to 10min at the temperature of 80 ℃ to 90 ℃ in the step 1).
Preferably, the soaking time in boiling water in the step 1) is 30-40 min.
Preferably, the hydrophobic substance in the step 2) is at least one of heptadecafluorodecyltrichlorosilane, 1H, 2H-perfluorooctyltriethoxysilane, hexadecyltrimethoxysilane, (heptadecafluoro-1, 2-tetradecyl) trimethoxysilane and trimethylchlorosilane.
Preferably, the soaking time of the dispersion liquid containing the hydrophobic substance in the step 2) is 3.0 h-3.5 h.
A refrigerator comprises the evaporator based on the super-hydrophilic coating and the hydrophobic coating.
The principle of the invention is as follows: the evaporator based on the super-hydrophilic coating and the super-hydrophilic coating is provided with the hydrophobic coating and the super-hydrophilic coating, the hydrophobic coating can reduce the attachment of water drops, delay the formation of the frost layer on the outer surface of the coil pipe and the surface of the fin and reduce the thickness of the frost layer, further improve the heat exchange efficiency of the evaporator and air, and when the defrosting operation of a refrigerator is carried out, because the contact angle of water drops on the hydrophobic surface is large, the contact area of the water drops with the outer surface of the coil pipe and the surface of the fin is small, the water drops are easy to fall off under the action of gravity and air convection, so that the residue of the liquid drops on the outer surface of the coil pipe and the surface of the fin is reduced, further the secondary frosting and icing speed of the evaporator can be delayed and the thickness of the frost layer is reduced; the super-hydrophilic coating on the inner surface of the coil pipe has super-hydrophilicity for the refrigerant liquid, and can attract more refrigerant liquid to the original part which is not wetted under the action of capillary force, so that the evaporation area of the refrigerant can be increased, the heat exchange between the refrigerant and the evaporator is promoted, and the refrigeration efficiency of the evaporator is improved; in addition, the super-hydrophilic coating is arranged on the surface of the fin, so that liquid drops formed in the melting process of the frost layer can flow to a desired position along a specified path to be gathered, and the centralized treatment is facilitated.
The invention has the beneficial effects that: the evaporator based on the super-hydrophilic coating and the hydrophobic coating has the advantages of high refrigeration efficiency, difficult frosting and icing on the surface, simple manufacturing process and low manufacturing cost, and is suitable for large-area popularization and application in the field of household refrigerators.
Drawings
Fig. 1 is a schematic view of the overall structure of an evaporator based on super-hydrophilic coating and hydrophobic coating of example 1.
Fig. 2 is a schematic diagram of the distribution of the hydrophobic coating and the superhydrophilic coating of the superhydrophilic coating and hydrophobic coating based evaporator of example 1.
Fig. 3 is a schematic diagram of the distribution of the hydrophobic coating and the superhydrophilic coating on the fin surface of the evaporator based on the superhydrophilic coating and the hydrophobic coating of example 1.
Fig. 4 is an SEM image of the superhydrophilic coating in the superhydrophilic and hydrophobic coating based evaporator of example 1.
Fig. 5 is an SEM image of the hydrophobic coating in the super hydrophilic coating and hydrophobic coating based evaporator of example 1.
The attached drawings indicate the following: 10. a coil pipe; 20. and a fin.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
an evaporator based on super-hydrophilic coating and hydrophobic coating (the overall structure is schematically shown in figure 1, the distribution of the hydrophobic coating and the super-hydrophilic coating is schematically shown in figures 2 and 3), which comprises a coil 10 and a fin 20; the outer surface of the coil pipe 10 is provided with a hydrophobic coating, the inner surface of the coil pipe 10 is provided with a super-hydrophilic coating, the hydrophobic coating on the outer surface of the coil pipe 10 is used for delaying the formation of a frost layer on the outer surface of the coil pipe 10, and the super-hydrophilic coating on the inner surface of the coil pipe 10 is helpful for the diffusion of a refrigerant in the coil pipe 10; a part of area of the surface of the fin 20 is provided with a hydrophobic coating, a part of area is provided with a super-hydrophilic coating, the hydrophobic coating on the surface of the fin 20 is used for delaying the formation of the frost layer on the surface of the fin 20, and the super-hydrophilic coating on the surface of the fin 20 is used for gathering and collecting liquid drops formed in the melting process of the outer surface of the coil pipe 10 and the frost layer on the surface of the fin 20; the coil 10 and the fins 20 are made of aluminum alloy.
The preparation method of the evaporator based on the super-hydrophilic coating and the hydrophobic coating comprises the following steps:
1) Polishing an aluminum alloy coil and an aluminum alloy fin by using abrasive paper, sequentially cleaning the aluminum alloy coil and the aluminum alloy fin by using deionized water and absolute ethyl alcohol, soaking the aluminum alloy coil and the aluminum alloy fin into a NaOH solution with the concentration of 0.05mol/L at 80 ℃ for 5min, and soaking the aluminum alloy coil and the aluminum alloy fin into boiling deionized water for 30min to obtain a coil with a super-hydrophilic coating and a fin with a super-hydrophilic coating;
2) Sealing two ends of the coil pipe treated in the step 1) by using an adhesive tape, then soaking the coil pipe into a normal hexane solution of heptadecafluorodecyl trichlorosilane with the mass fraction of 0.1%, soaking for 3 hours, taking out a refrigerator evaporator, cleaning the refrigerator evaporator by using the normal hexane and an HFE-7100 engineering solvent (3M), and airing to obtain the coil pipe of which the outer surface is provided with a hydrophobic coating and the inner surface is provided with a super-hydrophilic coating;
3) Covering and protecting a partial area of the surface of the fin treated in the step 1) by using an adhesive tape, then soaking the partial area into a normal hexane solution of heptadecafluorodecyltrichlorosilane with the mass fraction of 0.1%, soaking for 3 hours, taking out a refrigerator evaporator, cleaning the refrigerator evaporator by using the normal hexane and an HFE-7100 engineering solvent (3M), and airing to obtain the fin of which the partial area of the surface is provided with a hydrophobic coating and the partial area is provided with a super-hydrophilic coating;
4) Assembling the coil pipe treated in the step 2) and the fin treated in the step 3) to obtain the evaporator based on the super-hydrophilic coating and the hydrophobic coating.
Through tests, the water static contact angle of the hydrophobic coating in the evaporator based on the super-hydrophilic coating and the hydrophobic coating is more than 160 degrees, the water static contact angle of the super-hydrophilic coating is 0 degree, and the thicknesses of the hydrophobic coating and the super-hydrophilic coating are both 0.1-0.5 mu m.
The Scanning Electron Microscope (SEM) image of the superhydrophilic coating and the hydrophobic coating in the evaporator of this example is shown in fig. 4, and the SEM image of the hydrophobic coating is shown in fig. 5.
As can be seen from fig. 4: the surface of the super-hydrophilic coating is provided with micron-sized particles, the surfaces of the particles are provided with nano-scale villous structures which extend out from the original granular structures, and the capillary suction of the coating is improved by the structures, so that the wettability of refrigerant liquid on the inner surface of the coil is improved.
As can be seen from fig. 5: the hydrophobic coating grows on the surface of the super-hydrophilic coating and is in a nanoscale lamellar structure, and a large number of nanoscale flakes form pores with different sizes, so that a large amount of air can be captured, water hardly contacts the surface, and the surface is hydrophobic.
Example 2:
an evaporator based on a super-hydrophilic coating and a hydrophobic coating, which has the same structure as the evaporator based on the super-hydrophilic coating and the hydrophobic coating of example 1, was prepared by a process different from example 1 only in that the immersion time with the NaOH solution in step 1) was 10min.
Through tests, the water static contact angle of the hydrophobic coating in the evaporator based on the super-hydrophilic coating and the hydrophobic coating is 122-142 degrees, the water static contact angle of the super-hydrophilic coating is 5-10 degrees, and the thicknesses of the hydrophobic coating and the super-hydrophilic coating are both 0.1-0.5 mu m.
Example 3:
an evaporator based on a super-hydrophilic coating and a hydrophobic coating has the same structure as the evaporator based on the super-hydrophilic coating and the hydrophobic coating of example 1, and is prepared by only soaking with boiling deionized water for 5min in step 1) as compared with example 1.
Through tests, the water static contact angle of the hydrophobic coating in the evaporator based on the super-hydrophilic coating and the hydrophobic coating is 108-117 degrees, the water static contact angle of the super-hydrophilic coating is 0-5 degrees, and the thicknesses of the hydrophobic coating and the super-hydrophilic coating are both 0.1-0.5 mu m.
Example 4:
an evaporator based on a super-hydrophilic coating and a hydrophobic coating has the same structure as the evaporator based on the super-hydrophilic coating and the hydrophobic coating of example 1, and is prepared by only soaking with boiling deionized water for 10min in step 1) as compared with example 1.
Through tests, the water static contact angle of the hydrophobic coating in the evaporator based on the super-hydrophilic coating and the hydrophobic coating is 110-126 degrees, the water static contact angle of the super-hydrophilic coating is 0-5 degrees, and the thicknesses of the hydrophobic coating and the super-hydrophilic coating are both 0.1-0.5 mu m.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides an evaporimeter based on super hydrophilic coating and hydrophobic coating, its constitution includes coil pipe and fin, its characterized in that: the outer surface of the coil is provided with a hydrophobic coating, the inner surface of the coil is provided with a super-hydrophilic coating, the hydrophobic coating on the outer surface of the coil is used for delaying the formation of a frost layer on the outer surface of the coil, and the super-hydrophilic coating on the inner surface of the coil is helpful for the diffusion of a refrigerant in the coil; the fin comprises a coil pipe, a fin body and a super-hydrophilic coating, wherein the fin body is provided with a plurality of fins, the fins are arranged on the surface of the fin body, the fins are provided with the super-hydrophilic coating, the fin body is provided with the super-hydrophilic coating, the super-hydrophilic coating is arranged on the surface of the fin body, the super-hydrophilic coating is used for gathering and collecting liquid drops formed in the melting process of the outer surface of the coil pipe and the frost layer on the surface of the fin body; the preparation method of the evaporator based on the super-hydrophilic coating and the hydrophobic coating comprises the following steps: 1) Soaking the coil pipe and the fins in a sodium hydroxide solution, and then soaking in boiling water to obtain the coil pipe provided with the super-hydrophilic coating and the fins provided with the super-hydrophilic coating; 2) Sealing the two ends of the coil pipe treated in the step 1), soaking the coil pipe in a dispersion liquid containing a hydrophobic substance, taking out the coil pipe and drying the coil pipe to obtain the coil pipe of which the outer surface is provided with a hydrophobic coating and the inner surface is provided with a super-hydrophilic coating; covering and protecting partial area of the surface of the fin treated in the step 1), soaking the partial area by using a dispersion liquid containing a hydrophobic substance, taking out and drying the partial area to obtain the fin with the hydrophobic coating arranged in the partial area and the super-hydrophilic coating arranged in the partial area on the surface; 3) Assembling the coil pipe treated in the step 2) and the fin treated in the step 2) to obtain an evaporator based on the super-hydrophilic coating and the hydrophobic coating; the hydrophobic substance in the step 2) is at least one of heptadecafluorodecyltrichlorosilane, 1H, 2H-perfluorooctyltriethoxysilane, hexadecyltrimethoxysilane, (heptadecafluoro-1, 2-tetradecyl) trimethoxysilane and trimethylchlorosilane.
2. The super hydrophilic and hydrophobic coating based evaporator according to claim 1, characterized in that: the coil pipe is made of aluminum alloy; the fin is made of aluminum alloy.
3. The superhydrophilic and hydrophobic coating based evaporator of claim 2, wherein: the thickness of the super-hydrophilic coating is 0.1-0.5 μm.
4. The superhydrophilic and hydrophobic coating based evaporator of claim 2, wherein: the thickness of the hydrophobic coating is 0.1-0.5 μm.
5. The super hydrophilic and hydrophobic coating based evaporator according to claim 1, characterized in that: soaking the raw materials in the step 1) by using a sodium hydroxide solution at the temperature of 80-90 ℃ for 5-10 min.
6. The evaporator based on super hydrophilic coating and hydrophobic coating according to claim 1 or 5, characterized in that: the soaking time in the boiling water in the step 1) is 30-40 min.
7. The superhydrophilic and hydrophobic coating based evaporator according to claim 1 or 5, wherein: the time for soaking the dispersion liquid containing the hydrophobic substance in the step 2) is 3.0 to 3.5 hours.
8. A refrigerator, characterized in that its composition comprises an evaporator based on a superhydrophilic coating and a hydrophobic coating, according to any one of claims 1 to 7.
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| CN202210050985.3A CN114539921B (en) | 2022-01-17 | 2022-01-17 | Evaporator based on super-hydrophilic coating and hydrophobic coating and preparation method and application thereof |
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| CN202210050985.3A CN114539921B (en) | 2022-01-17 | 2022-01-17 | Evaporator based on super-hydrophilic coating and hydrophobic coating and preparation method and application thereof |
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| CN114539921B true CN114539921B (en) | 2022-10-21 |
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