CN110670831A - High-film-thickness diffuse reflection coating aluminum plate and manufacturing process thereof - Google Patents
High-film-thickness diffuse reflection coating aluminum plate and manufacturing process thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/12—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements of metal or with an outer layer of metal or enameled metal
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09D5/002—Priming 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
- C09D7/42—Gloss-reducing agents
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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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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
- E04F2290/04—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire
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Abstract
The invention provides a high-film-thickness diffuse reflection coated aluminum plate and a manufacturing process thereof, and relates to the technical field of metal plate coating, wherein the diffuse reflection coated aluminum plate comprises an aluminum plate, a back paint layer coated on the back surface of the aluminum plate, a diffuse reflection finish paint layer coated on the front surface of the aluminum plate, and a clear paint layer coated on the diffuse reflection finish paint layer, the diffuse reflection finish paint used by the diffuse reflection finish paint layer comprises resin and pigment, the resin is a polyester or fluorocarbon system, the content of the resin is 35 ~ 55% of the total weight of the paint, the pigment comprises one or a combination of nano barium sulfate powder and titanium dioxide, the content of the pigment is 15 ~ 30% of the total weight of the paint, the process comprises the steps of cleaning and passivating the aluminum plate, respectively coating a primer and the back paint on the front surface and the back surface of the aluminum plate, coating the diffuse reflection finish paint on the primer layer for multiple times, the film thickness of the diffuse reflection finish paint layer is 60 ~ 100 mu m, and coating the diffuse reflection finish paint on the diffuse reflection finish paint layer, the film thickness is 60 ~ 100 mu m, so that the diffuse.
Description
Technical Field
The invention relates to a high-film-thickness diffuse reflection coating aluminum plate and a manufacturing process thereof, belonging to the technical field of metal plate coating.
Background
The use of the traditional diffuse reflection coating plate is limited to small areas and small parts such as a standard plate of a laboratory and detection equipment, a lampshade and a lamp housing in the field of illumination, and the traditional diffuse reflection coating plate adopts a spraying process which is low in efficiency, high in energy consumption and not environment-friendly. The diffuse reflection plate manufactured by the original process, technology and equipment cannot meet the requirements of mass, industrialization and large-area application to building decoration materials. For example, patent CN201811028557.0 entitled diffuse reflection plate and its manufacturing method, the invention adopts the pretreatment of grinding, cleaning and phosphorizing the alloy plate, and coats conductive putty on the front plate surface, and then sprays 1mm thick paint containing barium sulfate powder after drying, and cures to form the diffuse reflection surface. The reflectance can be adjusted according to requirements, and the optical spectrum standard plate is used for a spectrum instrument. The invention adopts the spraying process on the sheet, the efficiency is low, and the application of the coating plate is narrow.
Meanwhile, the traditional diffuse reflection plate is limited by raw materials and processes, so that various problems exist, such as light condensation points still exist in illumination; the total reflectivity, the diffuse reflectivity and the light intensity are low; the coating is easy to pulverize after being heated for a long time under illumination, and has poor stability; the coating process is backward, the efficiency is low, and the like. All these drawbacks are the inevitable consequence of the raw materials used, the coating process being not optimal.
For example, CN201710043635.3 patent CN201710043635.3 discloses a fast-curing diffuse reflection coating, which is composed of a top coat and a primer, and discloses its application and preparation method of a coated plate, wherein the primer is coated on a substrate, baked and cured, the top coat is coated on the primer, baked and cured at 120 ~ 150 ℃ for 4 ~ 6 minutes, and the coating thickness is 100 ~ 150 microns.
The present application was made based on this.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the high-film-thickness diffuse reflection coating aluminum plate and the manufacturing process thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the diffuse reflection finish paint used for the diffuse reflection finish paint layer comprises resin and pigment, the resin is a polyester or fluorocarbon system and accounts for 35 ~ 55 mass percent of the total weight of the paint, the pigment comprises one or a combination of nano barium sulfate powder and titanium dioxide, and the pigment accounts for 15 ~ 30 mass percent of the total weight of the paint.
Preferably, a primer layer is coated between the aluminum plate and the diffuse reflection finishing paint layer.
Preferably, in order to increase the whiteness of the coating and thus improve the diffuse reflectance, the diffuse reflection paint further comprises one or a combination of an anti-yellowing whitening agent and a fluorescent whitening agent. The most effective method for improving the diffuse reflectance is to improve the whiteness of the coating, white is the color with the highest reflectance in the visible light range, and the wavelength of 550nm used for measuring the diffuse reflectance is also in the visible light wavelength range.
Preferably, the primer used for the primer layer is a polyurethane system, and the back paint used for the back paint layer is an epoxy or polyester system. The polyurethane has strong reactivity, high adhesive force and strong corrosion resistance; the cured coating has good flexibility and processability. The epoxy or polyester system coating is used as the back coating, mainly improves the corrosion resistance of the back of the material and improves the bonding force of bonding or foaming, and in addition, the epoxy or polyester system is used as the back coating and has the special effect that the probability of the pollution of the finish paint by a substrate can be reduced or prevented because the diffuse reflection surface coating needs to be coated, rolled and unreeled for many times and has the back coating.
Preferably, the varnish used in the varnish layer further comprises one or a combination of a silica matting agent, a matting powder and a heat-shrinkable coating. The special design is carried out on the coating composition and structure to avoid dazzling and dazzling of illumination and achieve the effect of soft and warm light: firstly, the surface glossiness of the coating is reduced by adopting a matting substance, and then microscopic folds or micro-convex structures are formed on the surface so as to achieve the illumination effect.
A manufacturing process of a high-film-thickness diffuse reflection coating aluminum plate comprises the following steps:
(1) cleaning and passivating the aluminum plate;
(2) respectively coating a primer and a back paint on the front surface and the back surface of the pretreated and passivated aluminum plate, wherein the film thickness of the primer layer is 5 ~ 10 micrometers, the film thickness of the back paint layer is 5 ~ 10 micrometers, and the baking temperature is 200 ~ 220 ℃;
(3) coating diffuse reflection finish paint on the primer layer for multiple times, wherein the film thickness of the diffuse reflection finish paint layer is 60 ~ 100 mu m, and the baking temperature is 210 ~ 245 ℃;
(4) and continuously coating the finishing varnish on the diffuse reflection finishing varnish layer, wherein the film thickness of the finishing varnish layer is 10 ~ 30 mu m, and the baking temperature is 232 ~ 245 ℃.
Preferably, in order to enhance the adhesion of interlayer bonding, the baking temperature of each time of coating the diffuse reflection finish is gradually increased, the temperature gradient is 5 ~ 15 ℃, the gradually increased baking is carried out at the step temperature, the purpose is to ensure that the former layer is kept with certain incomplete curing and has certain reaction activity, the reaction performance with the latter layer is improved, namely, the interlayer adhesion is improved, and the last layer is baked at a higher temperature for ensuring complete curing, so that the whole coating is completely cured.
Preferably, the baking temperature of the coating finish varnish is in a mode of gradually decreasing the temperature of an oven, the temperature gradient is 10 ~ 30 ℃, the gradually decreasing is adopted here, and is determined by the curing principle of the varnish layer, so that the effect of curing film forming, wrinkling or micro-protrusion is achieved at a higher temperature at the beginning stage of the coating finish varnish layer, the leveling process is reduced, and the later inner part tends to stabilize the curing state.
Preferably, the diffuse reflection finishing paint is applied in a reverse shearing mode in order to achieve a better leveling effect of the coating.
The reverse shear coating mode is shown in figure 1, the left side is a coating roller and a steering wheel, and the surface is provided with paint; the right side is the metal plate and belt transport direction. In this case, the direction of travel is reversed at the contact surface, i.e. a reverse shearing action occurs, and this type of application is generally referred to as reverse application. Because the coating belongs to non-Newtonian fluid and has the property of shear thinning, when the coating is subjected to shear strain, the fluidity of the coating is correspondingly increased, namely the leveling property is improved, and the surface is smoother.
The diffuse reflection rate of the diffuse reflection coating aluminum plate at the visible light wavelength of 550nm reaches more than 95%.
The aluminum substrate with the thickness of 0.2mm-3.0mm is adopted by the diffuse reflection coating aluminum plate, so that the coating plate has high diffuse reflection rate, excellent chemical parallel resistance, damp-heat resistance, corrosion resistance, long-term stability and easy processability, and is widely applied to the field of indoor building decoration.
The invention can realize the following technical effects:
(1) the aluminum plate has high diffuse reflection rate, the illumination light ray irradiation range can be enlarged, the total film thickness (namely the thickness of the coating) of the diffuse reflection coating aluminum plate reaches 100 ~ mu m, and is 5 ~ times of the film thickness of the conventional indoor decoration coating aluminum plate, so that the aluminum plate is particularly suitable for co-construction of high-speed rail station rooms, subway stations and the like, and decorating materials of ceilings and ceiling lamps in offices, schools and the like needing long-time illumination work and study at night.
(2) The invention adopts specific baking temperature, can increase the interlayer adhesion and ensure the bonding fastness, thereby better ensuring the diffuse reflection effect.
(3) In addition, the number of lamps can be reduced by adopting the invention, and the effects of energy conservation and environmental protection are achieved; the high diffuse reflectivity can enable indoor lighting arrangement to be more diversified, and meanwhile, decoration and illumination are combined into a whole, so that the decorative plate is a decorative plate and a light source plate; solves the dazzling and dizziness defects caused by mirror reflection, and makes the light soft and warm.
Drawings
FIG. 1 is a schematic view of a reverse shear coating mode according to the present invention;
FIG. 2 is a schematic view of an aluminum plate with a high-film-thickness diffuse reflection coating according to the present invention.
The reference numbers indicate the back paint layer 1, the aluminum plate 2, the primer layer 3, the diffuse reflection top paint layer 4, and the varnish layer 5.
Detailed Description
In order to make the technical means of the present invention and the technical effects achieved thereby clearer and more complete, three embodiments are provided, and the following detailed description is made with reference to the accompanying drawings:
example 1
The manufacturing process of the aluminum plate with the high-film-thickness diffuse reflection coating comprises the following steps:
(1) cleaning and passivating the aluminum plate;
(2) respectively coating a primer and a back paint on the front surface and the back surface of the pretreated and passivated aluminum plate, wherein the film thickness of the primer layer is 5 microns, the film thickness of the back paint layer is 5 microns, and the baking temperature is 200 ℃;
(3) coating diffuse reflection surface paint on the primer layer for 3 times, wherein the film thickness of the diffuse reflection surface paint layer is 60 mu m, and the baking temperature is 210 ℃;
(4) and continuously coating the finishing varnish on the diffuse reflection finishing varnish layer, wherein the film thickness of the finishing varnish layer is 10 mu m, and the baking temperature is 232 ℃.
The baking temperature of the diffuse reflection finish coating is gradually increased in a step-wise mode every time, and the temperature gradient is 5 ℃.
The baking temperature of the coating finish varnish is gradually reduced in a step-type manner by adopting the temperature of an oven, and the temperature gradient is 10 ℃.
The diffuse reflection top coat comprises resin, filler, and one or the combination of yellowing-resistant whitening agent and fluorescent whitening agent; in the resin and the pigment used in the diffuse reflection finish, the resin is a polyester system, and the content of the resin is 35 mass percent of the total weight of the coating; the pigment comprises one or the combination of nano barium sulfate powder and titanium dioxide, and the mass fraction of the pigment content is 15 percent of the total weight of the coating.
The primer is a polyurethane system, and the back paint is an epoxy system.
A silica matting agent was added to the finish varnish.
The coating mode of the diffuse reflection finishing paint adopts a reverse shearing mode.
Example 2
The manufacturing process of the aluminum plate with the high-film-thickness diffuse reflection coating comprises the following steps:
(1) cleaning and passivating the aluminum plate;
(2) respectively coating a primer and a back paint on the front surface and the back surface of the pretreated and passivated aluminum plate, wherein the film thickness of the primer layer is 8 microns, the film thickness of the back paint layer is 8 microns, and the baking temperature is 210 ℃;
(3) coating diffuse reflection surface paint on the primer layer for 4 times, wherein the film thickness of the diffuse reflection surface paint layer is 80 mu m, and the baking temperature is 230 ℃;
(4) and continuously coating the finishing varnish on the diffuse reflection finishing varnish layer, wherein the film thickness of the finishing varnish layer is 20 mu m, and the baking temperature is 240 ℃.
The baking temperature of each time of coating the diffuse reflection finishing paint is increased in a step-by-step mode, and the temperature gradient is 5 ~ 15 ℃.
The baking temperature of the coating finish varnish adopts a mode of gradually reducing the temperature of an oven, and the temperature gradient is 10 ~ 30 ℃.
The diffuse reflection top coat comprises resin, filler, and one or the combination of yellowing-resistant whitening agent and fluorescent whitening agent; in the resin and the pigment used in the diffuse reflection finish, the resin is a polyester system, and the content of the resin is 45 mass percent of the total weight of the coating; the pigment comprises one or the combination of nano barium sulfate powder and titanium dioxide, and the content of the pigment is 22 percent of the mass fraction of the total weight of the coating.
The primer is a polyurethane system, and the back paint is a polyester system.
Matting powder is added into the finishing varnish.
The coating mode of the diffuse reflection finishing paint adopts a reverse shearing mode.
Example 3
According to different performance characteristics of the finish paint, a primer-free process can be selected, and the diffuse reflection layer can be directly sprayed on the aluminum plate.
The manufacturing process of the aluminum plate with the high-film-thickness diffuse reflection coating comprises the following steps:
(1) cleaning and passivating the aluminum plate;
(2) coating a back paint on the back of the aluminum plate after pretreatment and passivation, wherein the film thickness of the back paint layer is 10 mu m, and the baking temperature is 220 ℃;
(3) coating diffuse reflection finish paint on an aluminum plate for 5 times, wherein the film thickness of the diffuse reflection finish paint is 100 mu m, and the baking temperature is 241 ℃;
(4) and continuously coating the finishing varnish on the diffuse reflection finishing varnish layer, wherein the film thickness of the finishing varnish layer is 30 mu m, and the baking temperature is 245 ℃.
The baking temperature of the diffuse reflection finish coating is gradually increased in a step-wise mode every time, and the temperature gradient is 15 ℃.
The baking temperature of the coating finish varnish is gradually reduced in a step-type manner by adopting the temperature of an oven, and the temperature gradient is 30 ℃.
The diffuse reflection top coat comprises resin, filler, and one or the combination of yellowing-resistant whitening agent and fluorescent whitening agent; in the resin and the pigment used by the diffuse reflection finish, the resin is a fluorocarbon system, and the content of the fluorocarbon system is 55 percent of the mass fraction of the total weight of the coating; the pigment comprises one or the combination of nano barium sulfate powder and titanium dioxide, and the content of the pigment is 30 mass percent of the total weight of the coating.
The primer is a polyurethane system, and the back paint is a polyester system.
Adding a heat-shrinkable coating into the finishing varnish.
The coating mode of the diffuse reflection finishing paint adopts a reverse shearing mode.
The diffuse reflection coated aluminum plate of the embodiment 2 is sent to a national building material testing center for testing and inspection, and a test report (the center number is WT2018B01C 02449) shows that the diffuse reflection of the diffuse reflection coated aluminum plate at the visible wavelength of 550nm reaches over 95%.
The interlayer adhesion passes through a lattice method specified in a paint film adhesion measuring method in GB/T1720 standard, a special tool is used for marking out the lattices, the lattices penetrate through a base material, the base material is bonded by an adhesive tape, and whether the lattices are peeled off or not is judged. The above examples 1 to 3 have no exfoliated lattice by the Baige method test, and thus the interlayer adhesion meets the standard requirements.
The above description is provided for the purpose of further elaboration of the technical solutions provided in connection with the preferred embodiments of the present invention, and it should not be understood that the embodiments of the present invention are limited to the above description, and it should be understood that various simple deductions or substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and all such alternatives are included in the scope of the present invention.
Claims (10)
1. The aluminum plate with the diffuse reflection coating with the high film thickness is characterized by comprising an aluminum plate, a back paint layer coated on the back of the aluminum plate, a diffuse reflection finish paint layer coated on the front of the aluminum plate and a clear paint layer coated on the diffuse reflection finish paint layer, wherein the diffuse reflection finish paint used for the diffuse reflection finish paint layer comprises resin and pigment, the resin is a polyester or fluorocarbon system and accounts for 35 ~ 55% of the total weight of the paint, the pigment comprises one or the combination of nano barium sulfate powder and titanium dioxide, and the pigment content accounts for 15 ~ 30% of the total weight of the paint.
2. The high film thickness, diffusely reflective coated aluminum sheet of claim 1, wherein: and a primer layer is coated between the aluminum plate and the diffuse reflection finish paint layer.
3. The high film thickness, diffusely reflective coated aluminum sheet of claim 1, wherein: the diffuse reflection finishing paint also comprises one or the combination of an anti-yellowing whitening agent and a fluorescent whitening agent.
4. The high film thickness, diffusely reflective coated aluminum sheet of claim 1, wherein: the primer used by the primer layer is a polyurethane system, and the back paint used by the back paint layer is an epoxy or polyester system.
5. The high film thickness, diffusely reflective coated aluminum sheet of claim 1, wherein: the varnish used for the varnish layer also comprises one or the combination of a silicon dioxide matting agent, matting powder and a heat-shrinkable coating.
6. A manufacturing process of a high-film-thickness diffuse reflection coating aluminum plate comprises the following steps:
(1) cleaning and passivating the aluminum plate;
(2) respectively coating a primer and a back paint on the front surface and the back surface of the pretreated and passivated aluminum plate, wherein the film thickness of the primer layer is 5 ~ 10 micrometers, the film thickness of the back paint layer is 5 ~ 10 micrometers, and the baking temperature is 200 ~ 220 ℃;
(3) coating diffuse reflection finish paint on the primer layer for multiple times, wherein the film thickness of the diffuse reflection finish paint layer is 60 ~ 100 mu m, and the baking temperature is 210 ~ 245 ℃;
(4) and continuously coating the finishing varnish on the diffuse reflection finishing varnish layer, wherein the film thickness of the finishing varnish layer is 10 ~ 30 mu m, and the baking temperature is 232 ~ 245 ℃.
7. The manufacturing process of the aluminum plate with the diffuse reflection coating and the high film thickness as claimed in claim 6, wherein the baking temperature of each time of coating the diffuse reflection finishing paint is increased in a stepwise mode, and the temperature gradient is 5 ~ 15 ℃.
8. The manufacturing process of the aluminum plate with the high-film-thickness diffuse reflection coating as claimed in claim 6, wherein the baking temperature of the coating finish varnish is gradually reduced in a mode that the temperature gradient is 10 ~ 30 ℃.
9. The process of claim 6, wherein the aluminum plate with a high film thickness and a diffuse reflection coating comprises: the diffuse reflection finishing paint coating mode adopts a reverse shearing mode.
10. The process of claim 6, wherein the aluminum plate with a high film thickness and a diffuse reflection coating comprises: the diffuse reflection rate of the diffuse reflection coating aluminum plate at the visible light wavelength of 550nm reaches more than 95%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111234579A (en) * | 2020-03-12 | 2020-06-05 | 上海安美特铝业有限公司 | Thin high-diffuse-reflection coating and preparation method thereof |
| CN112743955A (en) * | 2021-01-30 | 2021-05-04 | 河南永威安防股份有限公司 | High-voltage decorative board with diffuse reflection surface |
| CN113308154A (en) * | 2021-05-31 | 2021-08-27 | 常州市友晟电子有限公司 | Diffuse reflection coating and application thereof in adjusting LED light |
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