CN113930129B - Nano coating, heat exchanger and coating method - Google Patents
Nano coating, heat exchanger and coating method Download PDFInfo
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- CN113930129B CN113930129B CN202111297852.8A CN202111297852A CN113930129B CN 113930129 B CN113930129 B CN 113930129B CN 202111297852 A CN202111297852 A CN 202111297852A CN 113930129 B CN113930129 B CN 113930129B
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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
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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
- B05D7/24—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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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 a nano coating, belongs to the technical field of heat exchangers, and solves the problems of weak hydrophobicity and weak corrosion resistance of the existing heat exchanger; it includes: an anticorrosive hydrophobic coating; the anticorrosive hydrophobic coating comprises the following components: nano silicon dioxide, water-based epoxy resin, dimethyl dichlorosilane, methyl trichlorosilane, deionized water and absolute ethyl alcohol; the molar mass ratio of the components is 1:1: (10-15): (10-12): (30-60): (10-30). The nano coating has good hydrophobicity, can inhibit corrosive liquid from adhering to the surface of the heat exchanger, and ensures that the heat exchanger has strong corrosion resistance and long service life.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a nano coating, a heat exchanger and a coating method.
Background
When the ship air conditioning equipment is applied to high-salinity, high-humidity and high-ultraviolet regions such as coastal regions and islands, high-corrosivity acid solution is easily attached to the surface of the air conditioning heat exchanger used in the severe environment, the service life of the surface coating of the heat exchanger is shortened by the acid solution, and then the heat exchange capacity of the heat exchanger is reduced.
A large amount of organic solvent is used in the common solvent-based heat exchanger coating during production and construction, the organic solvent pollutes the environment, and part of the solvent-based heat exchanger coating is made of phenolic resin containing formaldehyde which threatens the health of human bodies during production and construction.
The common fin and the anticorrosive coating of the heat conducting pipe can influence the heat exchange performance of the aluminum foil and further influence the heat exchange effect of the heat exchanger, and the coating preparation process of the traditional heat exchanger, such as an electrophoresis process and the like, has serious environmental pollution.
Disclosure of Invention
In view of the above, there is a need to provide a nano-coating, a heat exchanger and a coating method, which are used to solve the problems of the existing heat exchanger that the hydrophobicity is weak and the corrosion resistance is not strong
The invention provides a nano coating, which is characterized by comprising the following components: an anticorrosive hydrophobic coating;
the anticorrosive hydrophobic coating comprises the following components: nano silicon dioxide, water-based epoxy resin, dimethyl dichlorosilane, methyl trichlorosilane, deionized water and absolute ethyl alcohol; the molar mass ratio of the components is 1:1: (10-15): (10-12): (30-60): (10-30).
Further, the nano silicon dioxide is prepared by hydrolysis reaction of tetraethoxysilane and ethanol.
The invention provides a heat exchanger, which comprises fins and a heat conducting pipe, wherein the fins are arranged at intervals, the heat conducting pipe is arranged in the fins in a penetrating way and is fixedly connected with the fins, and the surfaces of the heat conducting pipe and the fins are coated with nano coatings according to any one of claims 1 to 2.
Further, still include bottom plate and end plate, two the end plate is relative interval sets up, the both ends of bottom plate respectively with two the bottom fixed connection of end plate, it is a plurality of the fin sets up in two between the end plate, the bottom of fin with bottom plate fixed connection.
Further, be equipped with a plurality of slots on the inner wall of heat pipe, the slot winds the axis equidistance of heat pipe sets up.
Further, the heat conduction pipe is an aluminum substrate pipe, the fin is an aluminum substrate sheet, the thickness of the aluminum substrate of the heat conduction pipe or the fin is 0.08 μm to 0.2 μm, and the thickness of the nano coating is 1.5 μm to 2.8 μm.
The invention provides a coating method, which comprises the following steps:
s1, degreasing and cleaning: heating the cleaning agent, soaking the fins or the heat conduction pipes subjected to sealing treatment in the cleaning agent for cleaning, and then washing with clear water;
s2, dehydration and drying: taking out the cleaned fin or heat conduction pipe, naturally airing, and baking and drying;
s3, preparing the coating: sequentially adding ethyl orthosilicate, ethanol and water into a coating pool, mixing and stirring, and adding dilute hydrochloric acid serving as a catalyst to prepare a nano silicon dioxide solution; adding ammonia water into the solution at room temperature, stirring and separating, then adding dimethyldichlorosilane and methyltrichlorosilane solvents, and continuously stirring to form a hydrophobic nano-silica solvent; stirring and mixing the water-based epoxy resin and the prepared hydrophobic nano-silica solution at room temperature, then dripping dilute hydrochloric acid as a catalyst, magnetically stirring in a water bath at 50-55 ℃, removing foams and bubbles on the surface after fully stirring the coating, and standing to form a gel coating;
s4, immersion coating: after the viscosity of the gel coating is measured, the fin or the heat conducting pipe which needs to be coated is dried and is put into a coating pool for soaking.
Further, the method for coating the heat pipe and the fin further includes the steps of:
s5, local supplementary spraying: hanging the fins or the heat conducting pipes subjected to the S4 treatment, draining, and after the redundant coating drops into a coating pool, locally supplementing and spraying the non-uniformly coated parts of the fins or the heat conducting pipes;
s6, baking and curing: the completely sprayed fins or heat conducting pipes are intensively placed into a baking oven, and the coating is uniformly solidified on the outer surfaces of the fins or the heat conducting pipes by hot air baking.
Further, the gel coating obtained in S3 comprises nano silicon dioxide, water-based epoxy resin, dimethyldichlorosilane, methyltrichlorosilane, deionized water and absolute ethyl alcohol in a molar mass ratio of 1:1: (10-15): (10-12): (30-60): (10-30).
Further, the cleaning agent is alkaline solution, the pH value of the cleaning agent is 11-12, and the baking temperature in the baking oven is 200-250 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the nano coating, the heat exchanger and the coating method, the corresponding nano coating is coated on the heat conduction pipe and the fin of the heat exchanger according to the specific coating method, so that the corrosion resistance and the hydrophobic property of the heat conduction pipe and the fin in a severe environment can be greatly improved, and the service life of the heat exchanger is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a heat exchanger according to the present invention;
FIG. 2 is a schematic cross-sectional view of the inside of the heat pipe of the present invention;
FIG. 3 is a schematic cross-sectional view of a fin according to the present invention;
fig. 4 is a process flow diagram of a heat exchanger coating method of the present invention.
In the figure, a bottom plate 1, an end plate 2, a fin 3, a heat transfer pipe 4, a groove 41 and a nano coating 5.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Referring to fig. 1 to 4, in the nano coating, the heat exchanger and the coating method of the present embodiment, the heat pipe 4 and the fin 3 of the heat exchanger are coated with the corresponding nano coating 5 according to a specific coating method, so that the corrosion resistance and the water repellency of the heat pipe 4 and the fin 3 in a severe environment can be greatly improved, and the service life of the heat exchanger can be prolonged.
A nanocoating described in this embodiment, comprising: an anticorrosive hydrophobic coating; the anticorrosive hydrophobic coating comprises the following components: nano silicon dioxide, water-based epoxy resin, dimethyl dichlorosilane, methyl trichlorosilane, deionized water and absolute ethyl alcohol; the molar mass ratio of the components is 1:1: (10-15): (10-12): (30-60): (10-30). Of particular note are: the nano silicon dioxide is prepared by hydrolysis reaction of tetraethoxysilane and ethanol; the nano silicon dioxide takes ethanol as a solvent and dilute hydrochloric acid as a catalyst, and tetraethoxysilane ethanol is hydrolyzed under an acidic environment to generate nano silicon dioxide and ethanol, wherein the corresponding chemical reaction formula is as follows:
5Si(OC 2 H 5 ) 4 +10H 2 O＝5SiO 2 +20C 2 H 5 OH
the nano-silicon dioxide is dissolved in the solution to form a nano-silicon dioxide solution which is added into the anticorrosive hydrophobic coating as an additive.
Referring to fig. 1 to 3, the heat exchanger according to the embodiment includes fins 3 and heat pipes 4, the fins 3 are arranged at intervals, the fins 3 are arranged at equal intervals in an array, and the heat pipes 4 are inserted into the fins 3 and fixedly connected to the fins 3. In the specific implementation process, the heat conduction pipes 4 are arranged in a hairpin shape, and the coiled heat conduction pipes 4 repeatedly penetrate through the fins 3, so that the contact area between the heat conduction pipes 4 and the fins 3 can be increased, and the heat dissipation efficiency is improved. Most importantly: the surfaces of the heat conduction pipes 4 and the fins 3 are coated with anticorrosive hydrophobic coating. The anticorrosion hydrophobic coating can form a nano coating on the surfaces of the heat conduction pipe 4 and the fin 3, and the acidic liquid is difficult to adhere to the surface of the hydrophobic coating to corrode the coating. Meanwhile, the corrosion resistance of the coating is strengthened and is higher than that of the existing coating material, so that the service lives of the coating and the heat exchanger can be prolonged.
Referring to fig. 1, as a further embodiment, the heat exchanger further includes a bottom plate 1 and end plates 2, the two end plates 2 are arranged at an interval, two ends of the bottom plate 1 are respectively fixedly connected to bottoms of the two end plates 2, a plurality of fins 3 are arranged between the two end plates 2, and bottom ends of the fins 3 are fixedly connected to the bottom plate 1. End plate 2 and bottom plate 1 cooperation are connected and are formed U type support, and fin 3 sets up in the enclosure space of U type support, and fin 3's bottom and bottom plate 1 fixed connection. The main body part of the heat exchanger has simple structure and good connection strength, and can facilitate the maintenance and repair of the heat exchanger. The heat conduction pipe 4 is inserted in the fin 3 and penetrates out of the two end plates 2, the heat conduction pipe 4 is fixedly connected with the end plates 2, the connection strength between the heat conduction pipe 4 and the heat exchanger body is enhanced, and the heat conduction pipe 4 is prevented from being separated from the fin 3 in the using process.
Referring to fig. 2, the inner wall of the heat pipe 4 is formed with a groove 41, the groove 41 is triangular, the plurality of triangular grooves 41 are disposed around the central axis of the heat pipe 4 at equal intervals, the arrangement of the groove 41 can increase the contact area between the inner wall of the heat pipe 4 and the internal heat transfer fluid, and improve the heat exchange efficiency of the heat pipe 4.
It should be noted that: the heat conduction pipe 4 is an aluminum base material pipe, and the fin 3 is an aluminum base material sheet. In the specific implementation process, gold, silver, copper and aluminum have excellent heat-conducting property, but gold and silver are used as noble metals and have no practicability; copper pipes or fins have a slightly better thermal conductivity than aluminum, but copper is not corrosion resistant and is difficult to use for long periods of time. The aluminum material can form a compact oxide layer on the surface, isolate oxygen and moisture, and inhibit further corrosion. As a further embodiment, the thickness of the aluminum substrate is 0.08 μm to 0.2 μm and the thickness of the nanocoating is 1.5 μm to 2.8. Mu.m. The heat conductive pipes 4 or the fins 3 made of the aluminum substrate having the thickness in the range of 0.08 μm to 0.2 μm can maintain a certain strength without affecting the heat conductive efficiency of the heat conductive pipes 4 or the fins 3. The thickness of the nano coating with the thickness of 1.5-2.8 μm is far larger than that of the heat conduction pipe 4 or the fin 3, and the strength of the heat conduction pipe 4 and the fin 3 can be enhanced to a certain extent by coating the nano coating on the surfaces of the heat conduction pipe 4 and the fin 3. Meanwhile, when the nano coating of the heat pipe 4 or the fin 3 is corroded, the nano coating with the thickness of 1.5-2.8 μm needs a long time to be corroded, so that the heat pipe 4 or the fin 3 is damaged, and the service life of the heat pipe 4 or the fin 3 can be prolonged.
Referring to fig. 4, in the coating method of the heat exchanger in the present embodiment, the coating method of the heat conduction pipe 4 and the fin 3 includes the following steps:
s1, degreasing and cleaning: firstly, the cleaning agent is heated to about 40-60 ℃ by a heater, and a temperature control system is arranged in the heater, so that the temperature of the cleaning agent can be controlled within a set range. It should be noted that: the cleaning agent is an alkaline solution, the pH value of the cleaning agent is 11-12, the cleaning agent is specifically a sodium hydroxide solution, the cleaning agent is used for soaking the fins 3 or the heat conduction pipes 4 for 30-50 min, sealing treatment is carried out on the heat conduction pipes 4 before soaking, and after soaking is finished, the fins 3 or the heat conduction pipes 4 are cleaned by using clean water until no obvious cleaning agent is left.
S2, dehydration and drying: and (3) cleaning the fin 3 or the heat conduction pipe 4 processed by the step (S1), taking out, naturally airing, and baking and drying. In specific implementation, the rubber plug is used to block the two ends of the heat conducting pipe 4, so as to prevent the paint from entering the heat conducting pipe 4.
S3, preparing the coating: sequentially adding ethyl orthosilicate, ethanol and water into a coating pool, mixing and stirring for 10min-20min, then adding dilute hydrochloric acid as a catalyst to prepare a nano silicon dioxide solution, adding ammonia water into the nano silicon dioxide solution at room temperature, stirring and separating for 1h. Then adding dimethyl dichlorosilane and methyl trichlorosilane solvent into the solution, and continuously stirring to form the hydrophobic nano silicon dioxide solvent. And then, stirring and mixing the water-based epoxy resin and the prepared hydrophobic nano-silica solution at room temperature, then dripping dilute hydrochloric acid as a catalyst, magnetically stirring in a water bath at 50-55 ℃ for 30-40 min, removing foams and bubbles on the surface after the coating is fully stirred, and standing for 24 hours to form the gel coating. And the mol mass ratio of the nano silicon dioxide, the water-based epoxy resin, the dimethyl dichlorosilane, the methyl trichlorosilane, the deionized water and the absolute ethyl alcohol in the final gel coating is 1:1: (10-15): (10-12): (30-60): (10-30).
S4, immersion coating: after the viscosity is measured, the fin 3 or the heat conducting pipe 4 which needs to be coated is dried and is put into a coating pool to be soaked for 3min-4min. In the soaking process, the fin 3 or the heat conductive pipe 4 is completely immersed in the solution prepared in S3, and the solution adheres to the surface of the fin 3 or the heat conductive pipe 4.
S5, local supplementary spraying: after the fin 3 or the heat conduction pipe 4 processed in the step S4 is hung and drained, and the excess paint is dropped into the paint pool, local supplementary spraying is performed on the uneven-coated part of the fin 3 or the heat conduction pipe 4, so that the fin 3 or the heat conduction pipe 4 is prevented from being easily damaged due to the fact that the paint is adhered to some parts of the fin 3 or the heat conduction pipe 4 too thinly.
S6, baking and curing: the completely sprayed fins 3 or heat conducting pipes 4 are intensively placed in a baking oven, and hot air is used for baking to enable the coating to be uniformly solidified on the outer surfaces of the fins 3 or the heat conducting pipes 4. It should be noted that: the baking temperature in the baking oven is 200-250 ℃, and the fins 3 or the heat conduction pipes 4 are dried by hot air in the temperature range, so that the surfaces of the fins 3 or the heat conduction pipes 4 can be uniformly heated, and the curing degrees of all the parts are consistent.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A nanocoating, comprising: an anticorrosive hydrophobic coating;
the anticorrosive hydrophobic coating comprises the following components: nano silicon dioxide, water-based epoxy resin, dimethyl dichlorosilane, methyl trichlorosilane, deionized water and absolute ethyl alcohol; the molar mass ratio of the components is 1:1: (10-15): (10-12): (30-60): (10-30); the nano silicon dioxide is sol prepared by hydrolysis reaction of tetraethoxysilane and ethanol, tetraethoxysilane and ethanol are mixed and stirred, and diluted hydrochloric acid is added to prepare a nano silicon dioxide solution as a catalyst; adding ammonia water into the solution at room temperature, stirring and separating, then adding dimethyldichlorosilane and methyltrichlorosilane solvents, and continuously stirring to form a hydrophobic nano-silica solvent; stirring and mixing the water-based epoxy resin and the prepared hydrophobic nano-silica solution at room temperature, then dripping dilute hydrochloric acid serving as a catalyst, magnetically stirring in a water bath at 50-55 ℃, fully stirring the coating, removing foams and bubbles on the surface, and standing to form the gel coating.
2. A heat exchanger is characterized by comprising fins and heat conduction pipes, wherein the fins are arranged at intervals, the heat conduction pipes are arranged in the fins in a penetrating mode and fixedly connected with the fins, and the surfaces of the heat conduction pipes and the surfaces of the fins are coated with the nano coating as claimed in claim 1.
3. The heat exchanger according to claim 2, further comprising a bottom plate and end plates, wherein the two end plates are oppositely arranged at intervals, two ends of the bottom plate are fixedly connected with bottoms of the two end plates respectively, the plurality of fins are arranged between the two end plates, and bottom ends of the fins are fixedly connected with the bottom plate.
4. A heat exchanger according to claim 3, wherein the heat conducting pipes are provided with a plurality of grooves on the inner wall thereof, the grooves being disposed equidistantly around the central axis of the heat conducting pipes.
5. The heat exchanger as claimed in claim 4, wherein said heat conductive pipe is an aluminum substrate pipe, said fin is an aluminum substrate sheet, and said heat conductive pipe or said fin has a thickness of 0.08 μm to 0.2 μm in aluminum substrate; the thickness of the nano coating is 1.5-2.8 μm.
6. A coating method of a heat exchanger according to any one of claims 2 to 5, wherein the coating method of the heat conductive pipes and the fins comprises the steps of:
s1, degreasing and cleaning: heating the cleaning agent, soaking the fins or the heat conduction pipes subjected to sealing treatment in the cleaning agent for cleaning, and then washing with clear water;
s2, dehydrating and drying: taking out the cleaned fin or heat conduction pipe, naturally airing, and baking and drying;
s3, preparing the coating: sequentially adding ethyl orthosilicate, ethanol and water into a coating pool, mixing and stirring, and adding dilute hydrochloric acid serving as a catalyst to prepare a nano silicon dioxide solution; adding ammonia water into the solution at room temperature, stirring and separating, then adding dimethyldichlorosilane and methyltrichlorosilane solvents, and continuously stirring to form a hydrophobic nano-silica solvent; stirring and mixing the water-based epoxy resin and the prepared hydrophobic nano-silica solution at room temperature, then dripping dilute hydrochloric acid serving as a catalyst, magnetically stirring in a water bath at 50-55 ℃, fully stirring the coating, removing foams and bubbles on the surface, and standing to form a gel coating;
s4, immersion coating: and (4) after the viscosity of the gel coating obtained in the step (S3) is measured, placing the fin or the heat conducting pipe which needs to be coated and dried into a coating pool for soaking.
7. The coating method of a heat exchanger according to claim 6, wherein the coating method of the heat conductive pipes and the fins further comprises the steps of:
s5, local supplementary spraying: hanging the fins or the heat conducting pipes subjected to the S4 treatment, draining, and after the redundant coating drops into a coating pool, locally supplementing and spraying the non-uniformly coated parts of the fins or the heat conducting pipes;
s6, baking and curing: the completely sprayed fins or heat conducting pipes are intensively placed into a baking oven, and the coating is uniformly solidified on the outer surfaces of the fins or the heat conducting pipes by hot air baking.
8. The coating method of the heat exchanger according to claim 6, wherein the gel coating obtained in S3 comprises nano silica, water-based epoxy resin, dimethyldichlorosilane, methyltrichlorosilane, deionized water and absolute ethyl alcohol in a molar mass ratio of 1:1: (10-15): (10-12): (30-60): (10-30).
9. The method for coating a heat exchanger as recited in claim 7, wherein the cleaning agent is an alkaline solution, the pH of the cleaning agent is 11 to 12, and the baking temperature in the oven is 200 ℃ to 250 ℃.
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| CN116558327A (en) * | 2022-01-27 | 2023-08-08 | 浙江三花智能控制股份有限公司 | Heat exchanger and composite material for heat exchanger |
| CN116558326A (en) * | 2022-01-27 | 2023-08-08 | 浙江三花智能控制股份有限公司 | Heat exchanger and composite material for heat exchanger |
| CN115228703A (en) * | 2022-07-30 | 2022-10-25 | 东莞市全好新材料技术有限公司 | Nano material coating process for oil cooler |
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