Metal surface super-leveling coating method based on secondary metering coating technology

Abstract

The invention relates to the technical field of coating, in particular to a metal surface super-leveling coating method based on a secondary metering coating technology, which comprises the following steps: S1, Coating+ HiPIMS CO-PVD (Coordination + HiPIMS CO-Physical Vapor Deposition) treatment; s11, Coating is carried out, and zero-quantification VOC pure water-based nanometer acrylic resin coating is carried out; s12, carrying out HiPIMS CO-PVD (High Performance Instrumentation Management System CO S2, carrying out Coating processing; s3, quality detection; according to the invention, a horizontal coating mode is designed, the physical leveling efficiency is improved, a formula process is combined, a super-leveling process is realized, a secondary metering coating method is adopted, a metering rod coating mode which is usually used for experiment in a laboratory at ordinary times is changed into a combined coating mode which is used for actual production and is combined with a metering rod and a coating machine, and the production efficiency is improved. The super-leveling requirement of the coating in the special application field is met, the coating flatness of the surface of the base material is greatly improved by changing the position of the coating head and adjusting the coating liquid, and the reflective rate after the reflecting layer is overlaid can reach 95% or above.

Description

Technical Field

[0001] The invention relates to the technical field of coating, in particular to a metal surface super-leveling coating method based on a secondary metering coating technology. Background Art

[0002] Coating is a surface treatment method with many types, usually for the purpose of improving decorative aesthetics, providing special functions and protecting the substrate. Leveling is one of the factors that must be considered in the coating process. The coating method that takes leveling as the main indicator is mainly to improve the surface finish or brightness of the substrate. The standard for mechanical high-gloss paint is greater than 85 degrees. It is no longer necessary to increase the brightness in ordinary applications. The traditional precise coating improves the visual brightness mainly through the self-leveling formula process of the coating and the precise measurement of the coating amount. However, for the ordinary appearance brightness (ie reflectivity) reaching the level of 85, there is no more practical demand for further improvement. In some special application fields, there are particularly high requirements for flatness. The improvement of the surface flatness no longer uses the traditional coating process, but other processes are used to further improve the flatness of the material surface.

[0003] With the development of lighting, solar thermal power generation and facility agriculture, ultra-high reflective mirror aluminum has become a rigid demand. At that time, the reflectivity of mirror aluminum prepared by the existing coating method could only reach 92%, with high loss and unable to meet the application scenarios.

[0004] Therefore, in order to solve the problem of low reflectivity of mirror aluminum prepared by the above-mentioned traditional coating method, a metal surface super-leveling coating method based on secondary metering coating technology can be designed. Summary of the invention

[0005] In order to overcome the problem of low reflectivity of mirror aluminum prepared by traditional coating methods.

[0006] The technical solution of the present invention is: a metal surface super-leveling coating method based on a secondary metering coating technology, and the steps are as follows:

[0007] S1: Coating+HiPIMS CO-PVD treatment;

[0008] S11: Coating, zero-quantity VOC pure water-based nano acrylic resin coating;

[0009] S111: Clean and polish the surface to be coated to ensure that the surface is flat and clean, and remove grease, dust and stains;

[0010] S112: Open the water-based nano acrylic resin paint bucket, stir it thoroughly with a stirring rod or a blender to ensure that the resin and the solvent are thoroughly mixed, and then dilute it with clean water or a thinner according to the dilution ratio on the paint bucket as needed, and stir it again to obtain a coating liquid;

[0011] S113: coating the object to be coated by combining the metering rod and the coating head, adjusting the positions of the top coating head and the metering rod, controlling the amount of the coating liquid, and evenly coating the diluted water-based nano acrylic resin coating on the surface of the object to be coated by using the metering rod and the coating head, and then drying;

[0012] S12: HiPIMS CO-PVD treatment;

[0013] S121: First, the surface of the object to be coated needs to be pretreated, including cleaning and polishing steps, to remove impurities and unevenness on the surface of the object to be coated and improve the adhesion and uniformity of the coating;

[0014] S122: Select appropriate target material according to requirements and install it in vacuum coating equipment;

[0015] S123: Place the object to be coated into the vacuum chamber and start evacuating the chamber to remove air and other gases to ensure that the coating is carried out in a pure environment;

[0016] S124: Using high-power pulsed magnetron sputtering technology, high-power pulses and low duty cycle are used to form metal ions with high ionization rate on the object to be coated;

[0017] S125: Based on HiPIMS sputtering, the coating is deposited using CO-PVD technology. CO-PVD technology deposits atoms or molecules of the target material onto the substrate to form a coating by physical vapor deposition.

[0018] S126: After the coating is prepared, annealing treatment is performed to eliminate stress in the coating and improve the comprehensiveness of the coating;

[0019] S2: Coating treatment, repeat S111-S113;

[0020] S3: Finally, the prepared coating is quality tested to ensure that the coating meets the expected performance requirements.

[0021] Preferably, the zero-VOC pure water-based nano acrylic resin has a VOC content of less than 1%, a linear molecular structure, and an average particle size of 65 nm.

[0022] Preferably, the distance from the coating head to the surface of the object to be coated is 200-300 mm; the air pressure of the coating head is 0.3-0.4 MPa.

[0023] Preferably, the drying method includes ventilation drying, heating drying and infrared or microwave radiation drying.

[0024] Preferably, the target materials are divided into metals and oxides, wherein the metals are aluminum, chromium, nickel, molybdenum, and gold, and the oxides are ITO, silicon dioxide, and titanium dioxide.

[0025] As a preference, the cavity material of the vacuum coating equipment is 304 stainless steel; the main pump is a dry pump, a Roots pump, a turbomolecular pump, a cryogenic pump or a diffusion pump; the ultimate pressure: no-load ≤1.07×10 -4 Pa / 24h; Leakage rate: ≤1.33×10 -7 Pa.L / s.

[0026] Preferably, the winding speed during HiPIMS sputtering is 0.01 to 6 m / min.

[0027] Preferably, the annealing step is:

[0028] (a) Heating: The material is heated to 800°C to 950°C. This temperature is usually determined according to the type of material and the required properties.

[0029] (b) Holding: Maintain at the annealing temperature for 1 hour ± 10 minutes to ensure uniform heating of the material. This time period depends on the thickness and type of the material.

[0030] (c) Slow cooling: Cool the material at a rate of less than 20°C / h to avoid excessive residual stress.

[0031] Preferably, quality inspection items include thickness, hardness, adhesion and wear resistance tests.

[0032] The beneficial effects of the present invention are as follows: a horizontal coating method is designed to improve the efficiency of physical leveling, and combined with the formulation process, a super-leveling process is realized. A secondary metering coating method is adopted, and the metering rod coating method usually used in laboratory experiments is changed to actual production. The combined coating method of the metering rod and the coater meets the demand for super-leveling of the coating in special application fields. By changing the position of the coating head and adjusting the coating liquid, the coating flatness of the substrate surface is greatly improved, and the reflectivity after superimposing the reflective layer can reach more than 95%. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the embodiments.

[0034] Example 1

[0035] The present invention provides an embodiment: a metal surface super-leveling coating method based on a secondary metering coating technology, the steps of which are as follows:

[0036] S1: Coating+HiPIMS CO-PVD treatment;

[0037] S11: Coating, zero-quantity VOC pure water-based nano acrylic resin coating;

[0038] S111: Clean and polish the surface to be coated to ensure that the surface is flat and clean, and remove grease, dust and stains;

[0039] S112: Open the water-based nano acrylic resin paint bucket, stir it thoroughly with a stirring rod or a blender to ensure that the resin and the solvent are thoroughly mixed, and then dilute it with clean water or a diluent according to the dilution ratio on the paint bucket as needed, and stir it again to obtain a coating liquid. The VOC content of the zero-quantity VOC pure water-based nano acrylic resin is less than 1%, the molecular structure is linear, and the average particle size is 65nm;

[0040] S113: coating the object to be coated by combining the metering rod and the coating head, adjusting the positions of the top coating head and the metering rod, and the distance from the coating head to the surface of the object to be coated is 200 mm; the air pressure of the coating head is 0.3 MPa, and the amount of the coating liquid is controlled. The diluted water-based nano acrylic resin coating is evenly coated on the surface of the object to be coated by the coordinated use of the metering rod and the coating head, and then heated and dried;

[0041] S12: HiPIMS CO-PVD treatment;

[0042] S121: First, the surface of the object to be coated needs to be pretreated, including cleaning and polishing steps, to remove impurities and unevenness on the surface of the object to be coated and improve the adhesion and uniformity of the coating;

[0043] S122: According to the requirements, select the appropriate target material and install it in the vacuum coating equipment. The cavity material of the vacuum coating equipment is 304 stainless steel; the main pump uses a dry pump, Roots pump, turbomolecular pump, cryogenic pump or diffusion pump; the ultimate pressure: no-load ≤1.07×10 -4 Pa / 24h; Leakage rate: ≤1.33×10 -7 Pa.L / s, the target materials are divided into metals and oxides, among which the metals are aluminum, chromium, nickel, molybdenum, and gold, and the oxides are ITO, silicon dioxide, and titanium dioxide;

[0044] S123: Place the object to be coated into the vacuum chamber and start evacuating the chamber to remove air and other gases to ensure that the coating is carried out in a pure environment;

[0045] S124: Using high-power pulsed magnetron sputtering technology, high-power pulses and low duty cycle are used to form metal ions with high ionization rate on the object to be coated. The winding speed during HiPIMS sputtering is 1 m / min.

[0046] S125: Based on HiPIMS sputtering, the coating is deposited using CO-PVD technology. CO-PVD technology deposits atoms or molecules of the target material onto the substrate to form a coating by physical vapor deposition.

[0047] S126: After the coating is prepared, annealing is performed to eliminate stress in the coating and improve the comprehensiveness of the coating. The annealing steps are:

[0048] (a) Heating: heating the material to 850°C;

[0049] (b) Incubation: Keep at annealing temperature for 1 hour;

[0050] (c) Slow cooling: Cooling the material at a rate of less than 20°C / h;

[0051] S2: Coating treatment, repeat S111-S113;

[0052] S3: Finally, the prepared coating is quality inspected to ensure that the coating meets the expected performance requirements. The quality inspection items include thickness, hardness, adhesion and wear resistance tests.

[0053] Comparative Example 1

[0054] The object to be coated undergoes the following two steps:

[0055] S1: bright anodizing and PVD;

[0056] S2: Electrochemical bright anodizing.

[0057] Comparative Example 2

[0058] The object to be coated undergoes the following two steps:

[0059] S1: bright anodizing and PVD;

[0060] S2: Anodizing.

[0061] Table 1 is a performance analysis table of the mirror aluminum product prepared by Example 1 of the present invention and the mirror aluminum products prepared by Comparative Example 1 and Comparative Example 2.

[0062]

[0063]

[0064] Table 1 and Table 2 are the technical indicators of HiPIMS CO-PVD.

[0065] project Technical indicators <![CDATA[Single cathode power max > 40kW Pulse polarity Bipolar <![CDATA[Number of cathodes max > 12×2 <![CDATA[Allow film thickness max > >200μm Membrane-based bonding strength ＞180N Large particle size <20nm <![CDATA[Film layer hardness max > <![CDATA[-3600HV 0.05 ]]>

[0066] Table 2

[0067] Table 3 shows the indexes of the mirror aluminum reflective sheet prepared by the present invention.

[0068]

[0069]

[0070] Table 3

[0071] The embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A metal surface super-leveling coating method based on secondary metering coating technology, characterized in that: The steps are as follows: S1: Coating+HiPIMS CO-PVD treatment; S11: Coating, zero-quantity VOC pure water-based nano acrylic resin coating; S111: Clean and polish the surface to be coated to ensure that the surface is flat and clean, and remove grease, dust and stains; S112: Open the water-based nano acrylic resin paint bucket, stir it thoroughly with a stirring rod or a blender to ensure that the resin and the solvent are thoroughly mixed, and then dilute it with clean water or a thinner according to the dilution ratio on the paint bucket as needed, and stir it again to obtain a coating liquid; S113: coating the object to be coated by combining the metering rod and the coating head, adjusting the positions of the top coating head and the metering rod, controlling the amount of the coating liquid, and evenly coating the diluted water-based nano acrylic resin coating on the surface of the object to be coated by using the metering rod and the coating head, and then drying; S12: HiPIMS CO-PVD treatment; S121: First, the surface of the object to be coated needs to be pretreated, including cleaning and polishing steps, to remove impurities and unevenness on the surface of the object to be coated and improve the adhesion and uniformity of the coating; S122: Select appropriate target material according to requirements and install it in vacuum coating equipment; S123: Place the object to be coated into the vacuum chamber and start evacuating the chamber to remove air and other gases to ensure that the coating is carried out in a pure environment; S124: Using high-power pulsed magnetron sputtering technology, high-power pulses and low duty cycle are used to form metal ions with high ionization rate on the object to be coated; S125: Based on HiPIMS sputtering, the coating is deposited using CO-PVD technology. CO-PVD technology deposits atoms or molecules of the target material onto the substrate to form a coating by physical vapor deposition. S126: After the coating is prepared, annealing treatment is performed to eliminate stress in the coating and improve the comprehensiveness of the coating; S2: Coating treatment, repeat S111-S113; S3: Finally, the prepared coating is quality tested to ensure that the coating meets the expected performance requirements.

2. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: The VOC content of zero-quantity VOC pure water-based nano acrylic resin is less than 1%, the molecular structure is linear, and the average particle size is 65nm.

3. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: The distance from the coating head to the surface of the object to be coated is 200-300 mm; the air pressure of the coating head is 0.3-0.4 MPa.

4. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: Drying methods include ventilation drying, heating drying and infrared or microwave radiation drying.

5. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: The target materials are divided into metals and oxides, among which the metals are aluminum, chromium, nickel, molybdenum, and gold, and the oxides are ITO, silicon dioxide, and titanium dioxide.

6. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: The cavity of the vacuum coating equipment is made of 304 stainless steel; the main pump uses a dry pump, Roots pump, turbomolecular pump, cryogenic pump or diffusion pump; the ultimate pressure: no-load ≤1.07×10 -4 Pa / 24h; Leakage rate: ≤1.33×10 -7 Pa.L / s.

7. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: Take-up speed during HiPIMS sputtering: 0.01~6m / min.

8. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: The annealing steps are: (a) Heating: The material is heated to 800°C to 950°C. This temperature is usually determined according to the type of material and the required properties. (b) Holding: Maintain at the annealing temperature for 1 hour ± 10 minutes to ensure uniform heating of the material. This time period depends on the thickness and type of the material. (c) Slow cooling: Cool the material at a rate of less than 20°C / h to avoid excessive residual stress.

9. The metal surface super-leveling coating method based on the secondary metering coating technology according to claim 1 is characterized in that: Quality inspection items include thickness, hardness, adhesion and wear resistance tests.

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