CN106883665B - Photocatalyst additive and application method of hydrophilic coating containing same - Google Patents
Photocatalyst additive and application method of hydrophilic coating containing same Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 98
- 239000011248 coating agent Substances 0.000 title claims abstract description 94
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 58
- 239000000654 additive Substances 0.000 title claims abstract description 46
- 230000000996 additive effect Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000011888 foil Substances 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 18
- 238000004378 air conditioning Methods 0.000 claims description 17
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- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 229910052720 vanadium Inorganic materials 0.000 claims description 11
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- 238000001035 drying Methods 0.000 claims description 7
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- 241000233866 Fungi Species 0.000 description 1
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- YSTQDJNWDMBAOZ-UHFFFAOYSA-N [Br].C(C)N1CN(C=C1)C Chemical compound [Br].C(C)N1CN(C=C1)C YSTQDJNWDMBAOZ-UHFFFAOYSA-N 0.000 description 1
- GLMOMDXKLRBTDY-UHFFFAOYSA-A [V+5].[V+5].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O Chemical compound [V+5].[V+5].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GLMOMDXKLRBTDY-UHFFFAOYSA-A 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
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- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- JUWGUJSXVOBPHP-UHFFFAOYSA-B titanium(4+);tetraphosphate Chemical compound [Ti+4].[Ti+4].[Ti+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JUWGUJSXVOBPHP-UHFFFAOYSA-B 0.000 description 1
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- 238000001291 vacuum drying Methods 0.000 description 1
- 239000012002 vanadium phosphate Substances 0.000 description 1
- 239000003021 water soluble solvent Substances 0.000 description 1
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 1
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 description 1
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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
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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
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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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
- C09D5/16—Antifouling paints; Underwater 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
A photocatalyst additive and a using method of a hydrophilic coating containing the same. The invention discloses a photocatalyst additive used for hydrophilic coating, wherein the photocatalyst coating is nano TiO doped with Co, Fe, N and S2. The hydrophilic coating with the photocatalyst additive can play an excellent toluene removing effect; in addition, the invention also provides a using method of the hydrophilic coating added with the photocatalyst additive, and provides coating thicknesses corresponding to aluminum foils with different thicknesses when the hydrophilic coating is used for the aluminum fins of air conditioners.
Description
Technical Field
The invention relates to the technical field of coating materials, in particular to a photocatalyst additive and a use method of a hydrophilic coating containing the same.
Background
The photocatalyst is nano titanium dioxide (TiO)2) The general name of the representative photo-semiconductor material with the photocatalytic function is that the photo-semiconductor material is coated on the surface of a substrate and generates strong catalytic degradation function under the action of ultraviolet rays: can effectively degrade toxic and harmful gases in the air; can effectively kill various bacteria and decompose and harmlessly treat toxins released by bacteria or fungi; meanwhile, the paint also has the functions of removing toluene, deodorizing, resisting pollution, purifying air and the like. The photocatalyst technology is that professor of Tokyo university in 1967 establishes a professor and studies that the titanium dioxide electrode can decompose water into hydrogen and oxygen under the irradiation of ultraviolet rays accidentally under the research of the Tanskia island showa at that time. Under the irradiation of light, valence band electrons are excited to conduction band by nano titanium dioxide photocatalyst to form electrons and holes, and O adsorbed on its surface2And H2O acts to generate superoxide anion free radical, O2-and hydroxyl free radical-OH, the free radical has strong oxidative decomposition capability, can destroy C-C bond, C-H bond, C-N bond, C-O bond, O-H bond and N-H bond in organic matter, and decomposes the organic matter intoCarbon dioxide and water; meanwhile, the cell membrane of the bacteria is damaged to solidify the protein of the virus, and the living environment of the bacteria and the virus is changed, so that the bacteria and the virus are killed.
Although the doping research on the nano titanium dioxide is more in the prior art, the research on the nano titanium dioxide used in the hydrophilic coating is less.
Disclosure of Invention
The embodiment of the invention provides a photocatalyst additive and a using method of a hydrophilic coating containing the same. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, there is provided a photocatalyst additive.
In some exemplary embodiments, the photocatalyst additive is nano-TiO doped with cobalt (Co), iron (Fe), nitrogen (N), and sulfur (S)2。
In some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
in some optional embodiments, the photocatalyst additive is further doped with at least one element of vanadium V and carbon C.
In some optional embodiments, the weight parts of the vanadium V and the carbon C in the photocatalyst additive are as follows:
0-10% of vanadium V;
0-10% of carbon.
In some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
the hydrophilic coating with any one of the photocatalyst additives can form a hydrophilic film with the functions of resisting pollution, removing bacteria and removing methylbenzene after being dried.
According to a second aspect of embodiments of the present invention, there is provided a method of using a hydrophilic coating.
In some exemplary embodiments, the hydrophilic coating contains the photocatalyst additive described in any one of the above embodiments, and before the air-conditioning aluminum fin is molded, the hydrophilic coating is coated on the surface of the air-conditioning aluminum fin, and after drying, a film with photocatalyst property and hydrophilicity is formed on the surface of the air-conditioning aluminum fin; wherein the coating amount of the hydrophilic coating is as follows: 1 mg/square meter to 100 mg/square meter.
In some exemplary embodiments, the hydrophilic coating is applied as a photocatalytic topcoat to the aluminum fin of an air conditioning heat exchanger.
In some alternative embodiments, the thickness of the film is related to the thickness of the aluminum foil of the aluminum fin of the air conditioner heat exchanger.
In some optional embodiments, the temperature of the dried film is 80 ℃ to 300 ℃.
The above embodiment provides the coating amount of the hydrophilic coating added with the photocatalyst additive when the hydrophilic coating is used for the aluminum fin of the air conditioner.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a graph illustrating toluene decomposition effects of a hydrophilic coating with a photocatalyst additive, according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples merely typify possible variations. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
Although the research on doping elements in the photocatalyst additive is more in the prior art, the research on doping of the hydrophilic coating is less at present; the reason is mainly that the corrosion resistance, the hydrophilicity, the heat resistance and other related properties of the hydrophilic coating are affected due to different doping elements. And improper selection or proportioning of the doping elements can greatly impair the performance of the hydrophilic coating. Furthermore, different doping elements also have a great influence on the aging behavior of the hydrophilic coating. Therefore, the selection and the proportion of different elements become technical difficulties in the field.
According to a first aspect of embodiments of the present invention, there is provided a photocatalyst additive,
in some exemplary embodiments, the photocatalyst additive is used for a hydrophilic coating, and the photocatalyst additive is nano titanium dioxide (TiO) doped with cobalt (Co), vanadium (V), nitrogen (N) and sulfur (S)2. By adding nano TiO 22The cobalt Co, vanadium V, nitrogen N and sulfur S are doped, the effect of decomposing toluene by the hydrophilic coating can be improved, in addition, the performance of the hydrophilic coating can not be reduced by adding the two elements, and a film coated by the hydrophilic coating has hydrophilicity, corrosion resistance, heat resistance and alkali resistance, and has important significance for improving the performance of the aluminum fin of the air-conditioning heat exchanger.
Wherein the photocatalyst additive is prepared by a sol-gel method. The specific method comprises the following steps: in the roomSlowly adding a mixed solution of 34ml of tetrabutyl titanate and 70ml of anhydrous ethanol which are uniformly stirred under magnetic stirring into a mixed solution of vanadium nitrate, cobalt nitrate, ionic liquid containing nitrogen N and sulfur S and 30ml of anhydrous ethanol, 35ml of glacial acetic acid and 15ml of deionized water with different molar masses at the temperature for hydrolysis, stirring for 1.5h to obtain uniform and transparent sol, aging to obtain gel, then placing the gel in a vacuum drying mode at 80 ℃ to obtain dry gel, grinding, placing the gel in a box-type resistance furnace, and calcining for 2h at different calcining temperatures to obtain metal-doped nano titanium dioxide TiO2(ii) a The nitrogen-containing N ionic liquid is hydrophilic ionic liquid and can be 1-amino-3-alkyl-1, 2, 3-triazole nitrate; the sulfur-containing S ionic liquid can be 1-ethyl-3-methylimidazole bromine salt and N-butyl-N-methylpiperidine bromine salt.
Although the prior art has many researches on doping nano-titanium dioxide, the researches on the use of nano-titanium dioxide in hydrophilic coatings are few, and the reason is that the corrosion resistance, hydrophilicity, heat resistance, alkali resistance and other related performances of the hydrophilic coatings are influenced due to different doping elements. If the choice or proportion is not proper, such as the improper addition of vanadium (V), the corrosion resistance, hydrophilicity, heat resistance, and alkali resistance of the hydrophilic coating are greatly impaired. Furthermore, different doping elements have a great influence on the aging behavior of the hydrophilic coating. Therefore, the selection and the proportion of different elements are strictly controlled and are also one of the technical difficulties.
In some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
preferably, the cobalt Co may have a composition of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9% by weight; the iron Fe can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9% in parts by weight; the nitrogen N may be comprised of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9% by weight; the sulfur S may be comprised of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9% by weight.
In some illustrative embodiments, the nano-titanium dioxide TiO2The photocatalyst additive comprises the following components in parts by weight: 50 to 90 percent.
In some optional embodiments, the photocatalyst additive is further doped with at least one element of vanadium V and carbon C.
In the above process, if the photocatalyst additive is further doped with one or more elements of vanadium V and carbon C, adding vanadium nitrate and carbon C-containing ionic liquid in the above process of preparing the photocatalyst additive by the sol-gel method; wherein, the carbon-containing C ionic liquid can be 1-ethyl-3-methylimidazolium bromide salt and N-butyl-N-methylpiperidine bromide salt.
In some optional embodiments, the composition of the vanadium V, the tungsten W, the sulfur S, and the carbon C in parts by weight in the photocatalyst additive is as follows:
0-10% of vanadium V;
0-10% of carbon.
In this example, the doping weight percentages of the optional doping elements vanadium V and carbon C in the photocatalyst additive are given; preferably, the vanadium V may have a composition in parts by weight of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%; the carbon C may be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or 9%.
In some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
in some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
in some optional embodiments, the photocatalyst additive comprises the following components in parts by weight:
the above examples respectively show the conditions of the photocatalyst additive with the preferred component ratio, and the performance of the hydrophilic coating added with the photocatalyst additive in the above two examples after film formation is tested, and the test method and results are as follows:
table 1 gives the composition of the different samples in the experimental and reference groups;
in the test, the experimental group and the reference group have the same treatment process except that the components are different;
the treatment process comprises the following specific steps:
1. pretreating the surface to be detected and the surface of a 1000mm aluminum foil; the pretreatment comprises the following steps: degreasing process and priming process; wherein the degreasing process comprises the following steps: the degreasing agent is coated and then washed twice, and then dried, and in the test, the degreasing agent is an FC-315 degreasing agent provided by Paka surface treatment technology (Shanghai) Co., Ltd; the base coating process comprises the following steps: coating a corrosion-resistant bottom layer on the surface of the aluminum foil subjected to degreasing process, and then drying at 230 ℃ to form a film, wherein the film coating amount is controlled to be 95-100mg/m2The chemical treatment agent for the corrosion-resistant bottom layer is SG-E902 chemical treatment agent provided by Paka surface treatment technology (Shanghai) Co., Ltd;
2. carrying out surface coating on the aluminum foil subjected to surface pretreatment, and coating a photocatalyst surface layer; according to the table 1, the hydrophilic coating materials with different components, namely, the sample 1, the sample 2 and the reference sample are respectively coated on the surface of the aluminum foil by roller coating, dried at 230 ℃, and the coating amount is controlled to be 40-45mg/m2；
3. Evaluating the membrane performance of the experimental group and the control group;
the evaluation of the film properties was mainly investigated for several parameters: hydrophilicity, stain resistance, adherence, heat resistance, corrosion resistance, antibacterial properties, and pollutant-degrading ability; wherein the pollutant degradation capability is the capability of carrying out photocatalytic degradation on pollutants for toluene; the specific evaluation methods are shown in Table 2.
TABLE 1 Experimental and control groups
Table 2 evaluation items and evaluation methods
Table 3 evaluation results of film properties
| Sample number | Hydrophilicity | Resistance to soiling | Adhesion property | Heat resistance | Corrosion resistance | Antibacterial property | Toluene |
| Example A | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
| Example B | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
| Example C | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
| Reference sample | ○ | △ | △ | △ | △ | △ | × |
○ in Table 3 represents that the performance is good and meets the requirement, △ represents that the performance is general but qualified, × represents that the performance does not meet the requirement;
as can be seen from Table 3, the examples A, B and C have good performance, not only meet the basic requirements of the aluminum foil on the performance of the coated film, but also have the effect of decomposing toluene; while ordinary nano TiO 22Although the hydrophilicity meets the requirement, the antifouling property, the adhesion property, the heat resistance, the corrosion resistance and the antibacterial property are common, and the toluene is basically not decomposed and cannot meet the requirement of the aluminum foil on toluene decomposition;
in the process, the photocatalytic degradation performance of the pollutants is evaluated by quantitatively coating the pollutants on a treatment material subjected to an experiment, and carrying out quantitative analysis by means of FT-IR after light irradiation.
The specific analysis steps are as follows:
A. contaminant coating
Uniformly coating pollutants on a treatment material subjected to an experiment in a quantitative manner by a wire bar coater, and drying the treatment material in a constant-temperature oven at 80 ℃ until the weight is constant;
B. irradiation with visible light
Placing the experimental material coated with the pollutants in an indoor visible light environment and in a simulated visible light lamp box to perform irradiation for a specified time; wherein the irradiation intensity is 0.5mW/cm2Irradiation area of 50cm2The ambient temperature is 28 ℃ and the ambient humidity is 50%;
C. quantitative analysis
And (3) carrying out FT-IR analysis on the experimental materials before and after the visible light irradiation, carrying out quantitative integration on characteristic peaks of the pollutants, and calculating the photodegradation rate.
The results of examples A, B, C and the reference, respectively, on the decomposition of toluene are detailed in FIG. 1;
as can be seen from fig. 1, examples a (coating a), B (coating B) and C (coating C) all had a good effect of decomposing toluene, but the reference decomposition effect was poor, and the above-mentioned contaminants were hardly decomposed effectively.
The above embodiment provides a hydrophilic coating with a photocatalyst additive for the surface of an aluminum fin of an air-conditioning heat exchanger, and the hydrophilic coating can form a hydrophilic film with a debenzolization effect after being dried.
According to a second aspect of embodiments of the present invention, there is provided a method of using a hydrophilic coating,
in some exemplary embodiments, the hydrophilic coating contains the photocatalyst additive described in any one of the above embodiments, and before the air-conditioning aluminum fin is molded, the hydrophilic coating is coated on the surface of the air-conditioning aluminum fin, and after drying, a film with photocatalyst property and hydrophilicity is formed on the surface of the air-conditioning aluminum fin; wherein the coating amount of the hydrophilic coating is as follows: 1 mg/square meter to 100 mg/square meter.
Optionally, the hydrophilic coating is applied in an amount of 10mg/m2、20mg/m2、30mg/m2、40mg/m2、50mg/m2、60mg/m2、70mg/m2、80mg/m2Or 90mg/m2. The coating amount is to exert the photocatalyst performance of the involucra to the maximum extent on the premise of ensuring that the hydrophilic coating is not influenced by aging or deterioration, thereby ensuring that the air conditioner realizes self-cleaning functions of antibiosis, oil stain removal and the like in the using process. Too low addition affects the performance of the photocatalyst, and too high addition affects the performance of the hydrophilic coating. Such as hydrophilicity, corrosion resistance, heat resistance, alkali resistance, adhesion, and the like.
In the present invention, the hydrophilic coating material to which the photocatalyst additive is added may be used as it is or after being diluted with water, and the concentration and viscosity of the treatment liquid should be appropriately adjusted to meet the operation method and the predetermined film thickness requirement.
Preferably, the film thickness after drying is 0.05 to 5 μm, more preferably: 0.1 to 2 μm, when the film thickness is less than 0.05. mu.m, it is difficult to provide satisfactory photocatalyst and hydrophilic properties, and when the film thickness exceeds 5 μm, thermal conductivity and film adhesion may be lowered.
In some illustrative embodiments, the hydrophilic coating is applied as a photocatalytic topcoat to the aluminum fin of an air conditioning heat exchanger. The hydrophilic coating provided by the embodiment of the invention is mainly developed for coating the aluminum fin of the heat exchanger of the air conditioner, so that the components of the photocatalyst additive and the coating method of the hydrophilic coating containing the photocatalyst additive are provided for being applied to the environment.
In some illustrative embodiments, the hydrophilic coating is applied as a photocatalytic topcoat to the aluminum fin of an air conditioning heat exchanger.
In some illustrative embodiments, the film thickness of the hydrophilic coating is correlated to the aluminum foil thickness of the air conditioner heat exchanger aluminum fin.
In some alternative embodiments, the thicker the aluminum foil of the air conditioner heat exchanger aluminum fin, the thicker the film of the hydrophilic coating.
In some illustrative embodiments, if the aluminum foil of the aluminum fin of the air conditioner heat exchanger has a thickness of 1000mm, the film thickness of the hydrophilic coating after coating is 0.05-2 μm; if the thickness of the aluminum foil of the aluminum fin of the air-conditioning heat exchanger is 3000mm, the film thickness of the hydrophilic coating after coating is 0.05-5 mu m; if the thickness of the aluminum foil of the aluminum fin of the air-conditioning heat exchanger is 8000mm, the film thickness of the hydrophilic coating after coating is 0.05-8 mu m. The thickness of the film directly influences the performance of the film, and the film is difficult to provide satisfactory photocatalytic performance and hydrophilicity due to the fact that the film is too thin, and the film is poor in thermal conductivity and poor in film adhesion due to the fact that the film is too thick; on the premise of ensuring that the hydrophilic coating can provide excellent photocatalytic performance, hydrophilic performance, aging resistance, pollution resistance and the like after being coated, the film thickness of the hydrophilic coating corresponding to different series of aluminum foils is provided in the embodiment.
In some optional embodiments, before the hydrophilic coating is applied, the method further comprises performing pretreatment on the surface of the aluminum fin of the air conditioner heat exchanger to improve the corrosion resistance of the surface.
In some alternative embodiments, the method of pre-treatment, preferably by chemical conversion, is based on, for example: chemical treatment of zirconium phosphate, titanium phosphate, vanadium phosphate or organic-inorganic hybrid; preferably, the corrosion-resistant bottom layer can be formed on the surface of the air conditioner heat exchanger fin through organic-inorganic hybrid chemical treatment.
In some illustrative embodiments, the hydrophilic coating has a film forming temperature of 80 to 300 ℃.
In some alternative embodiments, the hydrophilic coating is dried at 80-300 ℃ by using a hot air circulation oven, a heat radiation oven, or the like. Preferably, the hydrophilic coating is dried at a temperature of 100 ℃ and 260 ℃.
In some alternative embodiments, since the hydrophilic coating is hydrophilic and thus the solvent for dissolving the hydrophilic coating is mainly composed of water, a water-soluble solvent such as alcohol, alcohol ether solvent, etc. may be used in order to adjust the drying speed, improve the state of the coating film, or increase the solubility of the components. Further, one or more of rust inhibitors, chelating agents, fillers, colorants, defoaming agents and the like may also be added to the components of the hydrophilic coating in an amount within a range not to impair the gist of the present invention and film properties.
In some illustrative embodiments, the method of applying the hydrophilic coating comprises: dip coating, spray coating, brush coating, roller coating, flow coating esters, electrochemical deposition and chemical deposition; the roll coating in the industrial production is preferably used.
In some optional embodiments, in the photocatalyst hydrophilization treatment method, the surface of the metal material can be subjected to degreasing and surface pretreatment which are conventional in the current industrial production; subsequently, a photocatalytic hydrophilic coating is deposited on the surface of the metal material, and then heated and dried to form a film.
The embodiment provides a using method of the hydrophilic coating used for the air conditioner aluminum fin, and provides coating thicknesses corresponding to aluminum foils with different thicknesses.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (5)
1. A photocatalyst additive is used for hydrophilic coating and is characterized in that the photocatalyst additive is nano TiO dioxide doped with Co, Fe, N and S2(ii) a The nano TiO2At least one element of vanadium V and carbon C is doped;
the photocatalyst additive comprises the following components in parts by weight: 0.01 to 10 percent of Co; 0.01 to 10 percent of Fe; n is 0.01 to 10 percent; 0.01 to 10 percent of S; v is 0-10%; c is 0-10%; the balance of nano TiO2。
2. The photocatalyst additive as defined in claim 1, wherein the photocatalyst additive is composed of, in weight fractions:
co is 0.08%; fe is 6 percent; n is 0.6%; s is 1%; c is 3 percent; the balance of nano TiO2。
3. A method for using a hydrophilic coating, wherein the hydrophilic coating contains the photocatalyst additive as described in claim 1 or 2, and before forming an air-conditioning aluminum fin, the hydrophilic coating is applied to the surface of the air-conditioning aluminum fin, and after drying, a film having photocatalyst property and hydrophilicity is formed on the surface of the air-conditioning aluminum fin; wherein the coating amount of the hydrophilic coating is as follows: 1 mg/square meter to 100 mg/square meter.
4. The use of claim 3, wherein the thickness of the film is related to the thickness of the aluminum foil of the aluminum fin of the air conditioning heat exchanger.
5. The use of claim 3, wherein the temperature of said film dried is from 80 ℃ to 300 ℃.
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Effective date of registration: 20200910 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201030 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. |