CN111304641A - Hot-dip aluminum-zinc plate chromium-free passivation solution and preparation method of hot-dip aluminum-zinc fingerprint-resistant plate - Google Patents
Hot-dip aluminum-zinc plate chromium-free passivation solution and preparation method of hot-dip aluminum-zinc fingerprint-resistant plate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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Abstract
The invention relates to a hot-dip aluminum-zinc plate chromium-free passivation solution and a preparation method of a hot-dip aluminum-zinc fingerprint-resistant plate, belonging to the field of hot-dip galvanized steel plates. The invention solves the technical problem that the existing hot-dip aluminum-zinc steel plate has outstanding environmental protection problem and can not meet the requirements of industries such as electric control cabinets, buildings and the like on corrosion resistance, coating performance and fingerprint resistance. The hot-dip aluminum zinc plate chromium-free passivation solution comprises, by weight, 100 parts of water, 0.8-5.0 parts of a zirconium-containing compound, 0.3-3.0 parts of a rare earth compound, 1.0-5.0 parts of a corrosion inhibitor, 1.0-5.0 parts of a silane coupling agent, 10-30 parts of an aqueous polyurethane emulsion and 5-20 parts of an aqueous organic emulsion. The invention coats the hot-dip aluminum-zinc plate chromium-free passivation solution on the surface of the hot-dip aluminum-zinc plate, and then dries and solidifies to obtain the hot-dip aluminum-zinc fingerprint-resistant plate. The hot-dip aluminum-zinc environment-friendly fingerprint-resistant plate prepared by the invention has excellent corrosion resistance, coating property, fingerprint resistance, alkali resistance and water resistance.
Description
Technical Field
The invention belongs to the field of hot-dip galvanized steel plates, and particularly relates to a hot-dip aluminum-zinc plate chromium-free passivation solution and a preparation method of a hot-dip aluminum-zinc fingerprint-resistant plate.
Background
The hot-dip aluminum-zinc plate has the advantages of both hot galvanizing and hot-dip aluminum plates, and has the quality performance characteristics of excellent corrosion resistance, good appearance decoration and the like. The hot-dip aluminum zinc plate is widely applied to industries such as electric control cabinets, buildings and the like at home and abroad from the aspects of saving materials, reducing resource waste, being beneficial to environmental protection and the like.
In the use process of some products, some parts need to be sprayed, and other parts need to be directly used in an exposed mode, and the same hot-dip aluminum zinc plate is generally adopted to be established in order to ensure the uniformity of surface quality. Therefore, the hot-dip aluminum-zinc fingerprint resistant plate which can be coated and directly used as a bare piece is a development direction in the future. Due to the requirements of the use environment, some users require that the aluminum-zinc plate has both good corrosion resistance and environmental protection, and the environmental protection is also the development direction of hot-dip aluminum-zinc plates for electric control cabinets in future along with the increasing requirements of people on health and environment and the implementation of environmental protection instructions in building materials and the like of European Union.
Because the surface treatment technology of the hot-dip aluminum-zinc plate in China is not mature, the hot-dip aluminum-zinc plate for the electric control cabinet produced by most manufacturers at present is a hexavalent chromium fingerprint-resistant plate, is not environment-friendly, has poor coating property and cannot be directly sprayed; the corrosion resistance of the environment-friendly surface treatment cannot reach the level of the common fingerprint-resistant plate. In order to meet the requirements of users on environment protection, corrosion resistance and coating of hot-dip aluminum-zinc plates, the development of the high-performance hot-dip aluminum-zinc plate chromium-free passivation solution and the hot-dip aluminum-zinc fingerprint-resistant plate thereof has very important significance.
Disclosure of Invention
The invention solves the technical problem that the existing hot-dip aluminum-zinc steel plate has outstanding environmental protection problem and can not meet the requirements of industries such as electric control cabinets, buildings and the like on corrosion resistance, coating performance and fingerprint resistance.
The technical scheme for solving the problems is to provide the hot-dip aluminum zinc plate chromium-free passivation solution, the raw materials of the passivation solution are based on 100 parts by weight of water, and the passivation solution further comprises 0.8-5.0 parts by weight of a zirconium-containing compound, 0.3-3.0 parts by weight of a rare earth compound, 1.0-5.0 parts by weight of a corrosion inhibitor, 1.0-5.0 parts by weight of a silane coupling agent, 10-30 parts by weight of an aqueous polyurethane emulsion and 5-20 parts by weight of an aqueous organic emulsion, wherein the sum of the aqueous polyurethane emulsion and the aqueous organic emulsion is more than or equal to 25 parts by weight.
Wherein the zirconium-containing compound is at least one of sodium fluorozirconate, potassium fluorozirconate, calcium fluorozirconate and fluorozirconic acid.
Wherein the rare earth compound is at least one of cerium nitrate, cerous nitrate, lanthanum nitrate, ammonium ceric nitrate, cerium sulfate, lanthanum sulfate, cerium chloride and lanthanum chloride.
Wherein the corrosion inhibitor is at least one of sodium tripolyphosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium molybdate, ammonium molybdate, potassium tungstate, citric acid, gluconic acid and sodium lactate.
Wherein the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, vinyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, isocyanate propyl triethoxysilane, and acryloxypropyl trimethoxysilane.
Wherein the water-based organic emulsion is at least one of water-based silicon modified acrylic resin emulsion, water-based epoxy emulsion, water-based wax emulsion, water-based organic silicon resin emulsion and water-based fluorocarbon emulsion.
The invention also discloses a preparation method of the hot-dip aluminum zinc plate chromium-free passivation solution, which comprises the steps of firstly dissolving the zirconium-containing compound in water, then adding the corrosion inhibitor, adding the rare earth compound after the zirconium-containing compound is dissolved, adding the aqueous organic emulsion and the aqueous polyurethane emulsion after the rare earth compound is completely dissolved, adding the silane coupling agent after the mixture is uniformly stirred, and uniformly stirring the mixture to obtain the hot-dip aluminum zinc plate chromium-free passivation solution.
The invention further discloses a preparation method of the hot-dip aluminum-zinc fingerprint-resistant plate, which comprises the steps of coating the hot-dip aluminum-zinc plate chromium-free passivation solution on the surface of the hot-dip aluminum-zinc plate, and then drying and curing to obtain the hot-dip aluminum-zinc fingerprint-resistant plate.
Wherein the curing temperature is 70-100 ℃, and the curing time is more than or equal to 10 s.
The chemical components of the coating of the hot-dip aluminum-zinc plated plate are 55 percent of Al, 43.4 percent of Zn and 1.6 percent of Si in percentage by weight.
The invention also discloses the hot-dip aluminum-zinc fingerprint-resistant plate prepared by the preparation method, wherein the thickness of the passivation solution coating of the hot-dip aluminum-zinc fingerprint-resistant plate is 0.4-1.5 mu m.
The invention has the beneficial effects that:
the hot-dip aluminum zinc plate chromium-free passivation solution provided by the invention does not contain chromium, does not cause harm to human bodies and the environment, and is good in environmental protection; the hot-dip galvanized sheet chromium-free passivation solution provided by the invention has good stability and synergistic effect of various components, and the high-performance hot-dip aluminum zinc environment-friendly fingerprint-resistant sheet formed after coating and curing has excellent corrosion resistance, coating property, fingerprint resistance, alkali resistance, water resistance and other properties.
Detailed Description
The invention provides a hot-dip aluminum zinc plate chromium-free passivation solution, which comprises, based on 100 parts by weight of water, 0.8-5.0 parts by weight of a zirconium-containing compound, 0.3-3.0 parts by weight of a rare earth compound, 1.0-5.0 parts by weight of a corrosion inhibitor, 1.0-5.0 parts by weight of a silane coupling agent, 10-30 parts by weight of an aqueous polyurethane emulsion and 5-20 parts by weight of an aqueous organic emulsion, wherein the sum of the aqueous polyurethane emulsion and the aqueous organic emulsion is not less than 25 parts by weight.
The idea of designing the chromium-free passivation solution is as follows: the coating is characterized in that a water-based organic matter is used as a main film forming substance and reacts with an aluminum-zinc coating to form a film layer skeleton structure, a zirconium-containing compound and a silane coupling agent are used for assisting in forming a film and reacting with the coating, and the zirconium-containing compound and the silane coupling agent can be filled in gaps of a surface coating and crosslinked with the coating, so that the sealing effect and the combination effect of the film layer and the organic matter are enhanced, and the corrosion resistance and the coating performance of the coating are; the corrosion inhibitor and the rare earth compound improve the film forming rate of the coating liquid, improve the corrosion resistance of the film layer and enable the coating to have excellent performances such as corrosion resistance, coating performance, water resistance, alkali resistance and the like.
The hot-dip aluminum-zinc plate chromium-free passivation solution provided by the invention can form a very compact passivation coating on the surface of a hot-dip aluminum-zinc plate, wherein the zirconium-containing compound is mainly distributed at the bottom of the film layer, a small amount of the zirconium-containing compound exists on the surface of the film layer, the bonding force between the film layer and the coating is enhanced, a firm covalent bond (Si-O-Al) is formed with the coating after the film formation of the silane coupling agent, and the residual silane coupling agent and polyurethane are subjected to a cross-linking reaction and distributed in the film layer. The silane coupling agent and the polyurethane have functional groups such as CO-NH, -COOH, -OH and the like, so that the polarity of the surface of the film layer is enhanced, the silane coupling agent can directly react with organic paint such as polyester and the like to enhance the adhesive force with a coating film, and can also have a crosslinking effect with the silane coupling agent in the vitrification agent again, thereby enhancing the coating performance. Due to the crosslinking and filling effects of the silane coupling agent, the film layer has better compactness, so that the hot-dip aluminum-zinc environment-friendly fingerprint resistant plate has excellent corrosion resistance, fingerprint resistance, alkali resistance, water resistance and other properties.
Wherein the zirconium-containing compound is at least one of sodium fluorozirconate, potassium fluorozirconate, calcium fluorozirconate and fluorozirconic acid.
Wherein the rare earth compound is at least one of cerium nitrate, cerous nitrate, lanthanum nitrate, ammonium ceric nitrate, cerium sulfate, lanthanum sulfate, cerium chloride and lanthanum chloride.
Wherein the corrosion inhibitor is at least one of sodium tripolyphosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium molybdate, ammonium molybdate, potassium tungstate, citric acid, gluconic acid and sodium lactate.
Wherein the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, vinyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, isocyanate propyl triethoxysilane, and acryloxypropyl trimethoxysilane.
Wherein the water-based organic emulsion is at least one of water-based silicon modified acrylic resin emulsion, water-based epoxy emulsion, water-based wax emulsion, water-based organic silicon resin emulsion and water-based fluorocarbon emulsion.
The weight portion of the aqueous organic resin in the formula of the passivation solution refers to the weight of the corresponding emulsion, and the solid content of the aqueous organic resin is usually controlled to be 30-50% according to the product performance requirement.
The preparation method of the hot-dip aluminum zinc plate chromium-free passivation solution comprises the steps of firstly dissolving a zirconium-containing compound in water, then adding a corrosion inhibitor, adding a rare earth compound after the zirconium-containing compound is dissolved, adding an aqueous organic emulsion and an aqueous polyurethane emulsion after the rare earth compound is completely dissolved, adding a silane coupling agent after stirring uniformly, and stirring uniformly to obtain the hot-dip aluminum zinc plate chromium-free passivation solution.
The invention further discloses a preparation method of the hot-dip aluminum-zinc fingerprint-resistant plate, which comprises the steps of coating the hot-dip aluminum-zinc plate chromium-free passivation solution on the surface of the hot-dip aluminum-zinc plate, and then drying and curing to obtain the hot-dip aluminum-zinc fingerprint-resistant plate.
Wherein the curing temperature is 70-100 ℃, and the curing time is more than or equal to 10 s.
The hot-dip aluminum-zinc plated sheet according to the present invention is not particularly limited, and preferably, the chemical composition of the plating layer of the hot-dip aluminum-zinc plated sheet is 55% by weight of Al, 43.4% by weight of Zn, and 1.6% by weight of Si.
The invention also discloses the hot-dip aluminum-zinc fingerprint-resistant plate prepared by the preparation method, wherein the thickness of the passivation solution coating of the hot-dip aluminum-zinc fingerprint-resistant plate is 0.4-1.5 mu m.
The invention is further illustrated and described below by means of examples, comparative examples and performance tests.
Each example and comparative example comprises the preparation of a chromium-free passivation solution for an aluminum-zinc plated plate and a hot-dip aluminum-zinc fingerprint resistant plate.
The preparation method of the hot-dip aluminum zinc plate chromium-free passivation solution comprises the steps of firstly dissolving a zirconium-containing compound in water, then adding a corrosion inhibitor, adding a rare earth compound after the zirconium-containing compound is dissolved, adding an aqueous organic emulsion and an aqueous polyurethane emulsion after the rare earth compound is completely dissolved, adding a silane coupling agent after stirring uniformly, and stirring uniformly to obtain the hot-dip aluminum zinc plate chromium-free passivation solution.
The preparation method of the hot-dip aluminum-zinc fingerprint resistant plate comprises the steps of coating the hot-dip aluminum-zinc plate chromium-free passivation solution on a hot-dip aluminum-zinc steel strip in a roller coating manner, and curing at a curing temperature of 90 ℃ for 20s (the curing temperature is measured by adopting temperature measuring test paper) to obtain the high-performance hot-dip aluminum-zinc fingerprint resistant plate 1-10 and a comparative proportion D1-D6 respectively, wherein the chemical components of a coating of the hot-dip aluminum-zinc plate are 55% of Al, 43.4% of Zn and 1.6% of Si in percentage by weight.
The usage amounts of the raw materials in the chromium-free passivation solutions for hot-dip aluminum-zinc coated sheets of examples 1-10 and comparative examples 1-6 are shown in Table 1.
TABLE 1 Hot-dip aluminized zinc sheet chromium-free passivation solution
In examples 1-10 and comparative examples 1-6, the specific selection of each component is as follows:
in examples 1 to 5 and comparative examples 1 to 6, the zirconium-containing compound was fluorozirconic acid, the rare earth compound was cerium nitrate, the corrosion inhibitor was sodium molybdate, the silane coupling agent was γ -aminopropyltriethoxysilane, the solid content of the aqueous polyurethane emulsion was 48%, and the aqueous organic emulsion was an aqueous silicon-modified acrylic resin emulsion.
In example 6, the zirconium-containing compound was calcium fluorozirconate, which is different from example 1.
In example 7, the rare earth compound was lanthanum chloride, which is different from example 1.
In example 8, sodium tripolyphosphate was used as the corrosion inhibitor, unlike example 1.
In example 9, in contrast to example 1, vinyltrimethoxysilane was used as the silane coupling agent.
In example 10, the aqueous resin was an aqueous epoxy emulsion, which is different from example 1.
Performance testing
The stability test of the chromium-free passivation solution for the hot-dip aluminum-zinc plated plates of the examples and the comparative examples is carried out, and the test method comprises the following steps: the prepared fingerprint-resistant liquid is placed in a ventilation place indoors, and the time for which the liquid is stably stored, namely, the phenomena of color change, precipitation, agglomeration and the like do not occur is observed, and the result is shown in table 2. The quality guarantee period of the common coating treatment liquid such as common fingerprint-resistant treatment liquid, environment-friendly self-lubricating treatment liquid, environment-friendly fingerprint-resistant liquid and the like is 90 days.
The corrosion resistance, paintability, fingerprint resistance, heat resistance, water resistance and alkali resistance of the coatings of the hot-dip aluminum-zinc environment-friendly fingerprint resistant plates 1-10 and D1-D6 are tested, and the results are shown in Table 3.
Wherein, the corrosion resistance is tested according to the method and the conditions specified in GB/T10125, and then the corrosion result is evaluated according to the specification of GB12335-90 (the corrosion area is expressed by the percentage of the total area after 120h, 240h and 480 h). Among them, the smaller the etching area, the better. At present, the corrosion resistance of the hot-dip aluminum zinc plate coating generally requires that the NSST/120h corrosion area is less than or equal to 5 percent.
The coatability was determined according to the adhesion of the spray coating after the sample was vitrified and sprayed or directly sprayed (cross-cut test): if the sprayed coating does not fall off or tilt up, the spraying level is 0, if the sprayed coating slightly tilts up, the spraying level is 1, if the sprayed coating slightly falls off, the sprayed coating is 2, and if the sprayed coating largely falls off, the sprayed coating is 3. In order to meet the spraying requirement, the adhesiveness needs to reach 0 grade or 1 grade.
The fingerprint resistance is judged according to the change of the color difference value before and after the surface of the sample is coated with vaseline: if the change of the front and rear color difference is less than 1, the color difference is A level; if the change of the front and rear chromatic aberration is more than 1 and less than 2, the grade is B; if the change of the front and rear color difference is more than 2 and less than 4, the color is C-level; and if the change of the front and rear color difference is more than 4, the D level is obtained. The fingerprint resistance of the prior hot-dip aluminum-zinc plate coating is generally B grade and above.
The alkali resistance was determined according to the change of the sample immersed in a NaOH solution having a pH of 12 at 60 ℃ for 10 min: if the film layer has no bubble, drop, powder drop and other abnormal phenomena, the film layer is A grade; if the film layer has bubbles but does not have the phenomena of falling off, powder falling and the like, the film layer is B-grade; if the film layer has the phenomena of air bubbles, falling off, powder falling and the like, the film layer is in the C grade. In order to ensure the degreasing and cleaning process requirements of the sample before coating by a user, the alkali resistance of the coating is required to be A grade.
Water resistance was determined by dropping deionized water at 100 ℃ onto the test specimen: if the sample has no water mark completely, the sample is A grade; if the water stain is slight, the grade B is obtained; obvious water stain, grade C. The water resistance of the prior hot-dip aluminum-zinc plated plate is generally A grade.
The heat resistance was judged from the change of the sample at 200 ℃ for 30 min: if the change of the front and rear color difference is less than 4, the color difference is A level; if the change of the front and rear chromatic aberration is more than 4 and less than 8, the grade is B; and if the change of the front and rear color difference is more than 8, the color is C-level. The heat resistance of the prior hot-dip aluminum-zinc plate coating is generally A level, B level and C level.
Table 2 results of stability test of hot-dip aluminum-zinc plated sheet chromium-free passivation solution for examples and comparative examples
| Treatment liquid | Stabilization time (d) | Treatment liquid | Stabilization time (d) |
| Example 1 | ≥180 | Example 9 | ≥180 |
| Example 2 | ≥180 | Example 10 | ≥180 |
| Example 3 | ≥180 | Comparative example 1 | ≥180 |
| Example 4 | ≥180 | Comparative example 2 | 90 (with little precipitation) |
| Example 5 | ≥180 | Comparative example 3 | ≥180 |
| Example 6 | ≥180 | Comparative example 4 | ≥180 |
| Example 7 | ≥180 | Comparative example 5 | ≥180 |
| Example 8 | ≥180 | Comparative example 6 | ≥180 |
TABLE 3 test results of hot-dip aluminum-zinc fingerprint-resistant plate coating performance
Through the data in tables 2 and 3 and the comparison between examples 1-10 and comparative examples 1-6, it can be seen that the high performance hot dip aluminum zinc chromium-free passivation solution provided by the invention has good stability, and the high performance hot dip aluminum zinc environment-friendly fingerprint resistant plate formed after coating and curing has very excellent corrosion resistance, coating property, fingerprint resistance, alkali resistance, water resistance and other properties.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The hot-dip aluminum zinc plate chromium-free passivation solution is characterized in that: the passivation solution comprises the raw materials, by weight, 100 parts of water, 0.8-5.0 parts of a zirconium-containing compound, 0.3-3.0 parts of a rare earth compound, 1.0-5.0 parts of a corrosion inhibitor, 1.0-5.0 parts of a silane coupling agent, 10-30 parts of an aqueous polyurethane emulsion and 5-20 parts of an aqueous organic emulsion, wherein the sum of the aqueous polyurethane emulsion and the aqueous organic emulsion is more than or equal to 25 parts.
2. The chromium-free passivation solution for hot-dip aluminum zinc plates according to claim 1, characterized in that: the zirconium-containing compound is at least one of sodium fluorozirconate, potassium fluorozirconate, calcium fluorozirconate and fluorozirconic acid.
3. The hot-dip aluminized zinc sheet chromium-free passivation solution according to claim 1 or 2, characterized in that: the rare earth compound is at least one of cerium nitrate, cerous nitrate, lanthanum nitrate, ammonium ceric nitrate, cerium sulfate, lanthanum sulfate, cerium chloride and lanthanum chloride.
4. The hot-dip aluminum zinc plate chromium-free passivation solution as claimed in any one of claims 1 to 3, characterized in that: the corrosion inhibitor is at least one of sodium tripolyphosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium molybdate, ammonium molybdate, potassium tungstate, citric acid, gluconic acid and sodium lactate.
5. The hot-dip aluminum zinc plated sheet chromium-free passivation solution according to any one of claims 1 to 4, characterized in that: the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, vinyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, isocyanate propyl triethoxysilane and acrylate propyl trimethoxysilane.
6. The chromium-free passivation solution for hot-dip aluminum zinc sheets according to any one of claims 1 to 5, characterized in that: the water-based organic emulsion is at least one of water-based silicon modified acrylic resin emulsion, water-based epoxy emulsion, water-based wax emulsion, water-based organic silicon resin emulsion and water-based fluorocarbon emulsion.
7. The method for preparing the chromium-free passivation solution for the hot-dip aluminum zinc plate according to any one of claims 1 to 6, characterized in that: firstly, dissolving a zirconium-containing compound in water, then adding a corrosion inhibitor, adding a rare earth compound after dissolving, adding an aqueous organic emulsion and an aqueous polyurethane emulsion after completely dissolving, adding a silane coupling agent after uniformly stirring, and uniformly stirring to obtain the zirconium-containing organic polyurethane emulsion.
8. The preparation method of the hot-dip aluminum-zinc fingerprint-resistant plate is characterized by comprising the following steps: coating the hot-dip aluminum-zinc plate chromium-free passivation solution according to any one of claims 1 to 6 on the surface of a hot-dip aluminum-zinc plate, and then drying and curing to obtain a hot-dip aluminum-zinc fingerprint-resistant plate; the curing temperature is 70-100 ℃, and the curing time is more than or equal to 10 s.
9. The method for preparing the hot-dip aluminum-zinc fingerprint resistant plate according to claim 8, wherein the method comprises the following steps: the chemical components of the coating of the hot-dip aluminum-zinc plated plate are 55 percent of Al, 43.4 percent of Zn and 1.6 percent of Si in percentage by weight.
10. A hot-dip aluminized zinc fingerprint-resistant sheet produced according to claim 8 or 9, characterized in that: the thickness of the passivation solution coating of the hot-dip aluminum-zinc fingerprint-resistant plate is 0.4-1.5 mu m.
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Application publication date: 20200619 |