CN110684412A - Anti-corrosion wetting coating material, anti-corrosion wetting coating method and condensing unit heat exchanger - Google Patents

Anti-corrosion wetting coating material, anti-corrosion wetting coating method and condensing unit heat exchanger Download PDF

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CN110684412A
CN110684412A CN201910913104.4A CN201910913104A CN110684412A CN 110684412 A CN110684412 A CN 110684412A CN 201910913104 A CN201910913104 A CN 201910913104A CN 110684412 A CN110684412 A CN 110684412A
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coating
percent
heat exchanger
curing
modified
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李路
王奇
沈仁敏
李庆鑫
肖艺光
符众
张岚原
邢煊烨
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • 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
    • B05D3/102—Pretreatment of metallic substrates
    • 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
    • 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
    • B05D5/04—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a surface receptive to ink or other liquid
    • 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
    • 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
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—No clear coat specified each layer being cured, at least partially, separately
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/24—Homopolymers or copolymers of amides or imides
    • C09D133/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • 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
    • 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
    • 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
    • F25B39/04—Condensers
    • 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
    • B05D2451/00—Type of carrier, type of coating (Multilayers)
    • 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
    • B05D2502/00—Acrylic polymers
    • B05D2502/005—Acrylic polymers modified
    • 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
    • B05D2504/00—Epoxy polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking

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  • Organic Chemistry (AREA)
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  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention discloses an anticorrosion wetting coating material, which comprises a primer coating and a finish coating, wherein the primer coating is prepared from the following raw materials, by weight, 30% ~ 60% of modified resin, 0% 0 ~ 40% of water, 6% ~ 10% of an alcohol ether solvent, 1% ~ 7% of a curing agent, and 0.05% ~ 0.5.5% of a defoaming agent, and the finish coating is prepared from 9% ~ 15% of modified acrylic resin, 12% ~ 22% of modified polyacrylamide resin, 4% ~ 8% of an alcohol ether solvent, 0.05% ~ 0.5.5% of a defoaming agent, and 0.0 ~ 80% of water.

Description

Anti-corrosion wetting coating material, anti-corrosion wetting coating method and condensing unit heat exchanger
Technical Field
The invention relates to the technical field of condensing units, in particular to an anticorrosive wetting coating material, an anticorrosive wetting coating method and a condensing unit heat exchanger.
Background
The evaporative cooling air conditioning unit is a high-efficiency heat exchange device, and an outer unit of the unit is formed by combining a fan, a heat exchanger, a cooling spray device, a box body and other parts. The evaporative condenser is generally made of metal materials such as stainless steel, copper and galvanized steel sheets no matter the heat exchange material of the outer layer of the tubular heat exchanger or the plate heat exchanger, cooling water is sprayed to the surface of the metal material of the heat exchanger through a spraying device, and fresh air enters the heat exchanger to cool a refrigerating medium.
The cooling water sprayed by the water distribution system is directly sprayed on the metal material of the heat exchanger, no matter which type of heat exchanger is, the comprehensive wetting of the heat exchange metal material cannot be realized through single-side spraying, the dry spot condition generally exists, the heat exchange efficiency has negative influence, and the water quality in other parts of areas is weakly acidic, so that the corrosion influence on the heat exchanger made of metal materials is generated.
Disclosure of Invention
One of the purposes of the invention is to provide an anticorrosion wetting coating material which avoids the defects in the prior art, and not only can enable a primer coating to have excellent anticorrosion performance and improve the interlayer composite force between the coating and the coating, but also can enable a finish coating to have good hydrophilic performance, improve the wetting effect of the finish coating, reduce the dry spot condition and improve the heat exchange effect.
One of the purposes of the invention is realized by the following technical scheme:
providing an anti-corrosion wet coating material, which comprises a primer coating and a finish coating;
the primer coating is prepared from the following raw materials, by weight, 30% of modified resin ~ 60%, 0 ~ 40% of water, 6% of alcohol ether solvent ~ 10%, 1% of curing agent ~ 7%, and 0.05% of defoaming agent ~ 0.5.5%;
the finish paint is prepared from 9 wt% of modified acrylic resin ~ 15 wt%, 12 wt% of modified polyacrylamide resin ~ 22 wt%, 4 wt% of alcohol ether solvent ~ 8 wt%, and 0.05 wt% of defoamer ~ 0.5.5 wt%.
Further, the modified resin is modified acrylic resin or modified epoxy resin.
Further, the alcohol ether solvent is ethylene glycol butyl ether.
Has the advantages that: the modified acrylic resin and the modified polyacrylamide resin are added into the finish paint, so that the finish paint has good hydrophilic performance, the wetting effect of the finish paint is improved, the dry spot condition is reduced, and the heat exchange effect is improved.
The second purpose of the invention is to provide a coating method of the anti-corrosion wetting coating material, which avoids the defects in the prior art, is simple and convenient, and can ensure that the wetting area of the metal material on the surface of the coated heat exchanger is larger, reduce the dry spot condition, improve the heat exchange effect, and prolong the service life of the heat exchanger by using the high-anti-corrosion primer.
The second purpose of the invention is realized by the following technical scheme:
a method for coating a corrosion-resistant wetting coating material, the method for coating a plate heat exchanger comprising the steps of:
s1 degreasing and cleaning, namely dissolving the degreasing agent in water, stirring uniformly to prepare an alkaline solution with the pH =11 ~ 12, putting the metal sheet into the alkaline solution for degreasing, taking out the metal sheet, and cleaning the metal sheet with water to obtain a degreased plate heat exchanger;
s2 base coat coating, namely, taking 30 percent of modified resin ~ 60 percent, 0 percent of water 0 ~ 40 percent, 6 percent of alcohol ether solvent ~ 10 percent, 1 percent of curing agent ~ 7 percent and 0.05 percent of defoaming agent ~ 0.5.5 percent, uniformly stirring to prepare a base coat solution, and simultaneously coating the prepared base coat solution on the surface of the degreased plate heat exchanger in the step S1 by adopting a coating process;
s3, baking and curing, namely putting the plate heat exchanger coated with the base coat in the step S2 into a baking room to heat and cure the base coat, wherein the baking and curing temperature is set at 232 ~ 249 ℃, and after curing is finished, air cooling is carried out on the plate heat exchanger to obtain the base coat plate heat exchanger;
s4 surface coating, namely, taking 9 percent of modified acrylic resin ~ 15 percent, 12 percent of modified polyacrylamide resin ~ 22 percent, 4 percent of alcohol ether solvent ~ 8 percent, 0.05 percent of defoaming agent ~ 0.5.5 percent and 0 ~ 80 percent of water, uniformly stirring to prepare a surface coating solution, and simultaneously coating the prepared surface coating solution on the surface of the bottom-coating plate heat exchanger in the step S3 by adopting a coating process;
and S5, baking and curing, namely putting the plate heat exchanger coated on the surface in the step S4 into a baking room to heat and cure the finish, setting the baking temperature at 230 ~ 250 ℃, and cooling after curing to finish coating the plate heat exchanger.
Further, the coating method of the tubular heat exchanger comprises the following steps:
s1 degreasing and cleaning, namely dissolving the degreasing agent with water, stirring uniformly to prepare an alkaline solution with the pH =11 ~ 12, putting the metal sheet into the alkaline solution for degreasing, taking out the metal sheet, and cleaning the metal sheet with water to obtain a degreased tubular heat exchanger;
s2 bottom coating dipping, namely, taking 30 percent of modified resin ~ 60 percent, 0 percent of water 0 ~ 40 percent, 6 percent of alcohol ether solvent ~ 10 percent, 1 percent of curing agent ~ 7 percent and 0.05 percent of defoaming agent ~ 0.5.5 percent, uniformly stirring to prepare a bottom coating solution, and simultaneously coating the prepared bottom coating solution on the surface of the degreased tubular heat exchanger in the step S1 by adopting an integral coating process;
s3, baking and curing, namely putting the tubular heat exchanger which is subjected to the primary coating in the step S2 into a baking room to heat and cure the primary coating, wherein the baking and curing temperature is set at 232 ~ 249 ℃ and the heat exchange tube is cooled after the curing is finished to obtain the primary coating tubular heat exchanger;
s4 surface coating and dipping, namely, taking 9 percent of modified acrylic resin ~ 15 percent, 12 percent of modified polyacrylamide resin ~ 22 percent, 4 percent of alcohol ether solvent ~ 8 percent, 0.05 percent of defoaming agent ~ 0.5.5 percent and 0 ~ 80 percent of water, uniformly stirring to prepare a surface coating solution, and simultaneously coating the prepared surface coating solution on the surface of the primary coating tubular heat exchanger in the step S3 by adopting an integral coating process;
and S5, baking and curing, namely putting the tube heat exchanger coated on the surface in the step S4 into a baking room to heat and cure the finish, setting the baking temperature at 230 ~ 250 ℃, and cooling after curing.
Further, in steps S2 and S4, the coating process includes any one of a horizontal coating process, a vertical coating process, and a bulk coating process.
Further, when the coating process is a horizontal coating process or a vertical coating process, the requirements that the coating roller/linear speed =1.2 ~ 1.5.5, the tape roller/linear speed =0.5 ~ 0.6.6 and the coating roller/tape roller is approximately equal to 2 are met.
Further, in the steps S2 and S4, the single-sided dry film thickness of the base coat of the plate heat exchanger is 0.8 ~ 1.2.2 g/m2The one-sided dry film thickness of the top coating of the plate heat exchanger is 0.2 ~ 0.3.3 g/m2。
Further, in steps S2 and S4, the tube heat exchangerThe one-sided dry film thickness of the basecoat was 0.8 ~ 1.2.2 g/m2The one-sided dry film thickness of the top coating of the tubular heat exchanger is 0.2 ~ 0.3.3 g/m2。
The embodiment also provides a condensing unit heat exchanger, including heat exchanger body, priming paint layer and finish paint coating layer, priming paint coating in heat exchanger body surface, finish paint coating in priming paint coating upper surface.
Has the advantages that: the coating method is simple and convenient, and can ensure that the wetting area of the metal material on the surface of the coated heat exchanger is larger, reduce the dry spot condition, improve the heat exchange effect and prolong the service life of the heat exchanger by using the high-corrosion-resistance primer.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
Fig. 1 is a process flow diagram of a coating method of a plate heat exchanger according to a first embodiment of the present invention.
Fig. 2 is a process flow diagram of a coating method of a plate heat exchanger according to a second embodiment of the present invention.
Fig. 3 is a process flow diagram of a coating method of the tubular heat exchanger according to the third embodiment of the present invention.
Fig. 4 is a partial cross-sectional view of a heat exchanger body of the present invention.
The figure includes: heat exchanger body 1, priming paint coating layer 2 and finish paint coating layer 3.
Detailed Description
The invention is further described with reference to the following examples.
Example one
The anti-corrosion wet coating material comprises a primer coating and a finish coating;
the primer coating is prepared from the following raw materials in percentage by weight: 60% of modified resin, 22.5% of water, 10% of alcohol ether solvent, 7% of curing agent and 0.5% of defoaming agent; because the modified resin is added into the primer coating, the three-dimensional polymer network film can be formed through the crosslinking reaction of the modified resin, so that the primer coating has excellent corrosion resistance, the influence of water quality is avoided, and the interlayer composite force between the coating and the surface of the heat exchanger carrier can be improved, and the primer coating is not easy to fall off.
The finish paint is prepared from the following raw materials in percentage by weight: 15% of modified acrylic resin, 22% of modified polyacrylamide resin, 8% of alcohol ether solvent, 0.5% of defoaming agent and 54.5% of water; because the modified acrylic resin and the modified polyacrylamide resin are added into the finish paint, the finish paint has good hydrophilic performance, improves the wetting effect of the finish paint, reduces the dry spot condition and improves the heat exchange effect through a three-dimensional polymer network film formed by the cross-linking reaction of the modified acrylic resin and the modified polyacrylamide resin.
In a preferred embodiment, the modified resin is a modified acrylic resin or a modified epoxy resin.
In a preferred embodiment, the alcohol ether solvent is ethylene glycol butyl ether.
As shown in fig. 1, the present embodiment further provides a coating method of an anti-corrosion wet coating material, and the coating method of a plate heat exchanger includes the following steps:
s1 unreeling: uncoiling a metal coil stock;
s2 degreasing and cleaning, namely dissolving a degreasing agent with water to prepare a 1% aqueous solution, uniformly stirring the aqueous solution to prepare an alkaline solution with the pH =11 ~ 12, wherein the temperature of the solution is 50 ~ 60 ℃ during degreasing, the degreasing agent needs to be supplemented when the pH is less than 11, a metal sheet needs to stay in a degreasing tank for about 10S during degreasing, the metal sheet is taken out and cleaned with water, the pH is kept to be less than 8 during cleaning, and the water needs to be changed when the pH is more than 8, so that a degreasing plate type heat exchanger is prepared;
s3 base coat: taking 60% of modified resin, 22.5% of water, 10% of alcohol ether solvent, 7% of curing agent and 0.5% of defoaming agent, uniformly stirring, preparing into a base coating solution, simultaneously coating the prepared base coating solution on the surface of the degreased plate heat exchanger in the step S2 through a horizontal coating process by using a roll coater, and when the horizontal coating process is adopted, coating the surface of the degreased plate heat exchanger through the roll coaterThe following requirements are met: coating roll/linear speed =1.5, ribbon roll/linear speed =0.6, coating roll/ribbon roll ≈ 2; wherein the single-sided dry film thickness of the primary coating of the plate heat exchanger is 1.2g/m2；
S4 baking and curing: putting the plate heat exchanger coated with the base coat in the step S3 into a baking room to heat and cure the base coat, wherein the baking curing temperature is set at 249 ℃;
s5, cooling: after the curing is finished, the plate is cooled by wind to prepare a bottom-coated plate type heat exchanger;
s6 topcoat coating: taking 15% of modified acrylic resin, 22% of modified polyacrylamide resin, 8% of alcohol ether solvent, 0.5% of defoaming agent and 54.5% of water, uniformly stirring to prepare a top coating solution, and simultaneously coating the prepared top coating solution on the surface of the bottom-coated plate heat exchanger in the step S5 by a horizontal coating process through a roller coater, wherein when the horizontal coating process is adopted, the roller coater meets the following requirements: coating roll/linear speed =1.5, ribbon roll/linear speed =0.6, coating roll/ribbon roll ≈ 2; wherein the one-side dry film thickness of the top coating of the plate heat exchanger is 0.3g/m2；
S7 baking and curing: putting the plate heat exchanger coated with the top surface in the step S6 into a baking room to heat and cure the top surface, wherein the baking temperature is set at 250 ℃;
s8, cooling: after solidification, cooling, and finishing coating on the plate heat exchanger;
and S9, rolling, namely rolling the plate heat exchanger coated in the step S8, blanking the rolled material, stamping in a die, and welding and combining the two plates to manufacture the evaporative cooling heat exchange plate.
As shown in fig. 4, this embodiment still provides a condensing unit heat exchanger, including heat exchanger body 1, priming paint dope layer 2 and finish paint dope layer 3, priming paint dope layer 2 coats on heat exchanger body 1 surface, finish paint dope layer 3 coats on priming paint dope layer 2 upper surface, owing to be provided with priming paint dope layer 2 and finish paint dope layer 3, can be effectual 1 surperficial metal material wetting area of improvement heat exchanger body bigger, reduce "dry spot" condition, promote the heat transfer effect, high anticorrosive priming paint promotes heat exchanger body 1's life simultaneously.
Example two
The anti-corrosion wet coating material comprises a primer coating and a finish coating;
the primer coating is prepared from the following raw materials in percentage by weight: 52.95 percent of modified resin, 40 percent of water, 6 percent of alcohol ether solvent, 1 percent of curing agent and 0.05 percent of defoaming agent; because the modified resin is added into the primer coating, the three-dimensional polymer network film can be formed through the crosslinking reaction of the modified resin, so that the primer coating has excellent corrosion resistance, the influence of water quality is avoided, and the interlayer composite force between the coating and the surface of the heat exchanger carrier can be improved, and the primer coating is not easy to fall off.
The finish paint is prepared from the following raw materials in percentage by weight: 9% of modified acrylic resin, 12% of modified polyacrylamide resin, 4% of alcohol ether solvent, 0.05% of defoaming agent and 74.95% of water; because the modified acrylic resin and the modified polyacrylamide resin are added into the finish paint, the finish paint has good hydrophilic performance, improves the wetting effect of the finish paint, reduces the dry spot condition and improves the heat exchange effect through a three-dimensional polymer network film formed by the cross-linking reaction of the modified acrylic resin and the modified polyacrylamide resin.
In a preferred embodiment, the modified resin is a modified acrylic resin or a modified epoxy resin.
In a preferred embodiment, the alcohol ether solvent is ethylene glycol butyl ether.
As shown in fig. 2, the present embodiment further provides a coating method of an anti-corrosion wet coating material, and the coating method of a plate heat exchanger includes the following steps:
s1 unreeling: uncoiling a metal coil stock;
s2 degreasing and cleaning, namely dissolving a degreasing agent with water to prepare a 1% aqueous solution, uniformly stirring the aqueous solution to prepare an alkaline solution with the pH =11 ~ 12, wherein the temperature of the solution is 50 ℃ during degreasing, the degreasing agent needs to be supplemented when the pH is less than 11, a metal sheet needs to stay in a degreasing tank for about 10S during degreasing, the metal sheet is taken out and cleaned with water, the pH is kept to be less than 8 during cleaning, and water needs to be changed when the pH is more than 8 to prepare a degreasing plate type heat exchanger;
s3 base coat: taking 52.95% of modified resin, 40% of water, 6% of alcohol ether solvent, 1% of curing agent and 0.05% of defoaming agent, uniformly stirring to prepare a base coating solution, and simultaneously coating the prepared base coating solution on the surface of the degreased plate heat exchanger in the step S2 by using a horizontal coating process through a roll coater, wherein when a vertical coating process is adopted, the roll coater meets the following requirements: coating roll/linear speed =1.2, ribbon roll/linear speed =0.5, coating roll/ribbon roll ≈ 2; wherein the single-sided dry film thickness of the primary coating of the plate heat exchanger is 0.8g/m2；
S4 baking and curing: putting the plate heat exchanger coated with the base coat in the step S3 into a baking room to heat and cure the base coat, wherein the baking curing temperature is set at 232 ℃;
s5, cooling: after the curing is finished, the plate is cooled by wind to prepare a bottom-coated plate type heat exchanger;
s6 topcoat coating: taking 9% of modified acrylic resin, 12% of modified polyacrylamide resin, 4% of alcohol ether solvent, 0.05% of defoaming agent and 74.95% of water, uniformly stirring to prepare a top coating solution, and simultaneously coating the prepared top coating solution on the surface of the bottom-coating plate heat exchanger in the step S5 by a horizontal coating process through a roller coater, wherein when the horizontal coating process is adopted, the roller coater meets the following requirements: coating roll/linear speed =1.2, ribbon roll/linear speed =0.5, coating roll/ribbon roll ≈ 2; wherein the one-sided dry film thickness of the top coating of the plate heat exchanger is 0.2g/m2；
S7 baking and curing: putting the plate heat exchanger coated with the top surface in the step S6 into a baking room to heat and cure the top surface, wherein the baking temperature is set at 230 ℃;
s8, cooling: after solidification, cooling, and finishing coating on the plate heat exchanger;
s9 rolling and subsequent manufacturing: and (4) rolling the plate heat exchanger coated in the step (S8), blanking the coil, stamping in a die, and welding and combining the two plates to manufacture the evaporative cooling heat exchange plate.
As shown in fig. 4, this embodiment still provides a condensing unit heat exchanger, including heat exchanger body 1, priming paint dope layer 2 and finish paint dope layer 3, priming paint dope layer 2 coats on heat exchanger body 1 surface, finish paint dope layer 3 coats on priming paint dope layer 2 upper surface, owing to be provided with priming paint dope layer 2 and finish paint dope layer 3, can be effectual 1 surperficial metal material wetting area of improvement heat exchanger body bigger, reduce "dry spot" condition, promote the heat transfer effect, high anticorrosive priming paint promotes heat exchanger body 1's life simultaneously.
EXAMPLE III
The anti-corrosion wet coating material comprises a primer coating and a finish coating;
the primer coating is prepared from the following raw materials in percentage by weight: 47.7 percent of modified resin, 40 percent of water, 8 percent of alcohol ether solvent, 4 percent of curing agent and 0.3 percent of defoaming agent; because the modified resin is added into the primer coating, the three-dimensional polymer network film can be formed through the crosslinking reaction of the modified resin, so that the primer coating has excellent corrosion resistance, the influence of water quality is avoided, and the interlayer composite force between the coating and the surface of the heat exchanger carrier can be improved, and the primer coating is not easy to fall off.
The finish paint is prepared from the following raw materials in percentage by weight: 12% of modified acrylic resin, 17% of modified polyacrylamide resin, 6% of alcohol ether solvent, 0.3% of defoaming agent and 64.7% of water; because the modified acrylic resin and the modified polyacrylamide resin are added into the finish paint, the finish paint has good hydrophilic performance, improves the wetting effect of the finish paint, reduces the dry spot condition and improves the heat exchange effect through a three-dimensional polymer network film formed by the cross-linking reaction of the modified acrylic resin and the modified polyacrylamide resin.
In a preferred embodiment, the modified resin is a modified acrylic resin or a modified epoxy resin.
In a preferred embodiment, the alcohol ether solvent is ethylene glycol butyl ether.
As shown in fig. 3, the present embodiment further provides a coating method of the corrosion-resistant wet coating material, the coating method of the tubular heat exchanger includes the following steps:
s1 degreasing and cleaning, namely dissolving a degreasing agent with water to prepare a 1% aqueous solution, uniformly stirring the aqueous solution to prepare an alkaline solution with the pH =11 ~ 12, wherein the temperature of the solution is 55 ℃ during degreasing, the degreasing agent needs to be supplemented when the pH is less than 11, a metal sheet needs to stay in a degreasing tank for about 10S during degreasing, the metal sheet is taken out and cleaned with water, the pH is kept to be less than 8 during cleaning, and water needs to be changed when the pH is more than 8 to prepare a degreasing plate type heat exchanger;
s2 base coat impregnation: taking 47.7% of modified resin, 40% of water, 8% of alcohol ether solvent, 4% of curing agent and 0.3% of defoaming agent, uniformly stirring, preparing a base coat solution, and simultaneously coating the prepared base coat solution on the surface of the degreased tubular heat exchanger in the step (1) by using an integral coating process, wherein the thickness of the single-side dry film of the base coat of the tubular heat exchanger is 1.0 g/m2；
S3 baking and curing: putting the tubular heat exchanger coated with the base coat in the step (2) into a baking room to heat and cure the base coat, wherein the baking and curing temperature is set at 240 ℃;
s4, cooling: cooling the heat exchange pipe after the solidification is finished to prepare a primary coating pipe type heat exchanger;
s5 top-coating impregnation: 12% of modified acrylic resin, 17% of modified polyacrylamide resin, 6% of alcohol ether solvent, 0.3% of defoaming agent and 64.7% of water, uniformly stirring, preparing a top coating solution, and simultaneously coating the prepared top coating solution on the surface of the primary coating tubular heat exchanger in the step (3) by adopting an integral coating process, wherein the single-side dry film thickness of the top coating of the tubular heat exchanger is 0.25g/m2。
S6 baking and curing: putting the tubular heat exchanger coated with the surface in the step (4) into a baking room to heat and solidify the surface paint, setting the baking temperature at 240 ℃,
s7, cooling: and cooling after solidification, and welding and assembling the heat exchange tube and the heat exchange elbow according to the structure of the heat exchange coil to obtain the evaporative cooling heat exchanger.
As shown in fig. 4, this embodiment still provides a condensing unit heat exchanger, including heat exchanger body 1, priming paint dope layer 2 and finish paint dope layer 3, priming paint dope layer 2 coats on heat exchanger body 1 surface, finish paint dope layer 3 coats on priming paint dope layer 2 upper surface, owing to be provided with priming paint dope layer 2 and finish paint dope layer 3, can be effectual 1 surperficial metal material wetting area of improvement heat exchanger body bigger, reduce "dry spot" condition, promote the heat transfer effect, high anticorrosive priming paint promotes heat exchanger body 1's life simultaneously.
The invention has the beneficial effects that: because the modified resin is added into the primer coating, the three-dimensional polymer network film can be formed through the crosslinking reaction of the modified resin, the primer coating has excellent corrosion resistance, the influence of water quality is avoided, the interlayer composite force between the coating and the interlayer composite force between the coating and the surface of a heat exchanger carrier can be improved, the primer coating is not easy to fall off, meanwhile, the modified acrylic resin and the modified polyacrylamide resin are added into the finish coating, and the three-dimensional polymer network film can be formed through the crosslinking reaction of the modified acrylic resin and the modified polyacrylamide resin, so that the finish coating has good hydrophilic performance, the wetting effect of the finish coating is improved, the dry spot condition is reduced, and the heat exchange effect is improved; the coating method is simple and convenient, and can ensure that the wetting area of the metal material on the surface of the coated heat exchanger is larger, reduce the dry spot condition, improve the heat exchange effect and prolong the service life of the heat exchanger by using the high-corrosion-resistance primer.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. An anti-corrosion wet coating material, which is characterized in that: comprises a primer coating and a finish coating;
the primer coating is prepared from the following raw materials, by weight, 30% of modified resin ~ 60%, 0 ~ 40% of water, 6% of alcohol ether solvent ~ 10%, 1% of curing agent ~ 7%, and 0.05% of defoaming agent ~ 0.5.5%;
the finishing paint is prepared from 9 wt% of modified acrylic resin ~ 15 wt%, 12 wt% of modified polyacrylamide resin ~ 22 wt%, 4 wt% of alcohol ether solvent ~ 8 wt%, 0.05 wt% of defoaming agent ~ 0.5.5 wt%, and 0 ~ 80 wt% of water.
2. An anticorrosive wet coating material according to claim 1, characterized in that: the modified resin is modified acrylic resin or modified epoxy resin.
3. An anticorrosive wet coating material according to claim 1, characterized in that: the alcohol ether solvent is ethylene glycol butyl ether.
4. A method of applying an anticorrosive wet coating material according to any one of claims 1 to 3, characterized in that: the coating method of the plate heat exchanger comprises the following steps:
s1 degreasing and cleaning, namely dissolving the degreasing agent in water, stirring uniformly to prepare an alkaline solution with the pH =11 ~ 12, putting the metal sheet into the alkaline solution for degreasing, taking out the metal sheet, and cleaning the metal sheet with water to obtain a degreased plate heat exchanger;
s2 base coat coating, namely, taking 30 percent of modified resin ~ 60 percent, 0 percent of water 0 ~ 40 percent, 6 percent of alcohol ether solvent ~ 10 percent, 1 percent of curing agent ~ 7 percent and 0.05 percent of defoaming agent ~ 0.5.5 percent, uniformly stirring to prepare a base coat solution, and simultaneously coating the prepared base coat solution on the surface of the degreased plate heat exchanger in the step S1 by adopting a coating process;
s3, baking and curing, namely putting the plate heat exchanger coated with the base coat in the step S2 into a baking room to heat and cure the base coat, wherein the baking and curing temperature is set at 232 ~ 249 ℃, and after curing is finished, air cooling is carried out on the plate heat exchanger to obtain the base coat plate heat exchanger;
s4 surface coating, namely, taking 9 percent of modified acrylic resin ~ 15 percent, 12 percent of modified polyacrylamide resin ~ 22 percent, 4 percent of alcohol ether solvent ~ 8 percent, 0.05 percent of defoaming agent ~ 0.5.5 percent and 0 ~ 80 percent of water, uniformly stirring to prepare a surface coating solution, and simultaneously coating the prepared surface coating solution on the surface of the bottom-coating plate heat exchanger in the step S3 by adopting a coating process;
and S5, baking and curing, namely putting the plate heat exchanger coated on the surface in the step S4 into a baking room to heat and cure the finish, setting the baking temperature at 230 ~ 250 ℃, and cooling after curing to finish coating the plate heat exchanger.
5. A method of applying an anticorrosive wet coating material according to any one of claims 1 to 3, characterized in that: the coating method of the tubular heat exchanger comprises the following steps:
s1 degreasing and cleaning, namely dissolving the degreasing agent with water, stirring uniformly to prepare an alkaline solution with the pH =11 ~ 12, putting the metal sheet into the alkaline solution for degreasing, taking out the metal sheet, and cleaning the metal sheet with water to obtain a degreased tubular heat exchanger;
s2 bottom coating dipping, namely, taking 30 percent of modified resin ~ 60 percent, 0 percent of water 0 ~ 40 percent, 6 percent of alcohol ether solvent ~ 10 percent, 1 percent of curing agent ~ 7 percent and 0.05 percent of defoaming agent ~ 0.5.5 percent, uniformly stirring to prepare a bottom coating solution, and simultaneously coating the prepared bottom coating solution on the surface of the degreased tubular heat exchanger in the step S1 by adopting an integral coating process;
s3, baking and curing, namely putting the tubular heat exchanger which is subjected to the primary coating in the step S2 into a baking room to heat and cure the primary coating, wherein the baking and curing temperature is set at 232 ~ 249 ℃ and the heat exchange tube is cooled after the curing is finished to obtain the primary coating tubular heat exchanger;
s4 surface coating and dipping, namely, taking 9 percent of modified acrylic resin ~ 15 percent, 12 percent of modified polyacrylamide resin ~ 22 percent, 4 percent of alcohol ether solvent ~ 8 percent, 0.05 percent of defoaming agent ~ 0.5.5 percent and 0 ~ 80 percent of water, uniformly stirring to prepare a surface coating solution, and simultaneously coating the prepared surface coating solution on the surface of the primary coating tubular heat exchanger in the step S3 by adopting an integral coating process;
and S5, baking and curing, namely putting the tube heat exchanger coated on the surface in the step S4 into a baking room to heat and cure the finish, setting the baking temperature at 230 ~ 250 ℃, and cooling after curing.
6. A method of applying an anticorrosive wet coating material according to claim 4, characterized in that: in steps S2 and S4, the coating process includes any one of a horizontal coating process, a vertical coating process, and a full coating process.
7. A method for applying an anti-corrosive wet coating material as claimed in claim 6, wherein the coating process is a horizontal coating process or a vertical coating process, and the coating roll/linear velocity =1.2 ~ 1.5, the ribbon roll/linear velocity =0.5 ~ 0.6.6, and the coating roll/ribbon roll is approximately equal to 2.
8. A coating method of an anti-corrosion wet coating material as claimed in claim 4, wherein in the steps S2 and S4, the single-sided dry film thickness of the primer coating of the plate heat exchanger is 0.8 ~ 1.2.2 g/m2The one-sided dry film thickness of the top coating of the plate heat exchanger is 0.2 ~ 0.3.3 g/m2。
9. A coating method of corrosion-resistant wet coating material as claimed in claim 5, wherein in steps S2 and S4, the one-sided dry film thickness of the undercoat of the tubular heat exchanger is 0.8 ~ 1.2.2 g/m2The one-sided dry film thickness of the top coating of the tubular heat exchanger is 0.2 ~ 0.3.3 g/m2。
10. A condensing unit heat exchanger manufactured by a coating method of an anticorrosive wet coating material according to any one of claims 6 to 9, characterized in that: the heat exchanger comprises a heat exchanger body, a primer coating layer and a finish coating layer, wherein the primer coating layer is coated on the surface of the heat exchanger body, and the finish coating layer is coated on the upper surface of the primer coating layer.
CN201910913104.4A 2019-09-25 2019-09-25 Anti-corrosion wetting coating material, anti-corrosion wetting coating method and condensing unit heat exchanger Pending CN110684412A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7603497A (en) * 1976-04-02 1977-10-04 Pieter Voogel Permanent protection of metal surfaces by two pigmented resin coatings - consisting of primer with phosphoric acid epoxy ester resin and melamine resin and top coat of acrylamide resin and epoxy resin
CN104403497A (en) * 2014-11-11 2015-03-11 乳源瑶族自治县阳之光亲水箔有限公司 Hydrophilic coating aluminium foil and manufacturing method thereof
CN105017890A (en) * 2014-04-30 2015-11-04 晟通科技集团有限公司 Heat-transfer hydrophilic coating
CN105820719A (en) * 2015-01-04 2016-08-03 崔小玲 Base coat used for air conditioner foil and preparation method thereof
CN106634389A (en) * 2016-12-30 2017-05-10 广州慧谷化学有限公司 Coating for preparing lubricating hydrophilic coating and application thereof
CN107141950A (en) * 2017-05-02 2017-09-08 韶关瑞和环保科技有限公司 A kind of hydrophily lubricant coating coating and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7603497A (en) * 1976-04-02 1977-10-04 Pieter Voogel Permanent protection of metal surfaces by two pigmented resin coatings - consisting of primer with phosphoric acid epoxy ester resin and melamine resin and top coat of acrylamide resin and epoxy resin
CN105017890A (en) * 2014-04-30 2015-11-04 晟通科技集团有限公司 Heat-transfer hydrophilic coating
CN104403497A (en) * 2014-11-11 2015-03-11 乳源瑶族自治县阳之光亲水箔有限公司 Hydrophilic coating aluminium foil and manufacturing method thereof
CN105820719A (en) * 2015-01-04 2016-08-03 崔小玲 Base coat used for air conditioner foil and preparation method thereof
CN106634389A (en) * 2016-12-30 2017-05-10 广州慧谷化学有限公司 Coating for preparing lubricating hydrophilic coating and application thereof
CN107141950A (en) * 2017-05-02 2017-09-08 韶关瑞和环保科技有限公司 A kind of hydrophily lubricant coating coating and preparation method thereof

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