Colored extinction electrophoresis aluminum alloy profile and preparation method thereof

Abstract

The invention discloses a colored extinction electrophoresis aluminum alloy profile and a preparation method thereof. The preparation method comprises the following steps: providing an aluminum alloy profile blank; carrying out sand blasting treatment on the aluminum alloy profile blank; the aluminum alloy profile blank subjected to sand blasting treatment is subjected to pretreatment and oxidation coloring treatment, and a first blank is obtained; the first blank is subjected to color extinction electrophoresis, washing, drying and cooling to obtain a finished product. The color difference of all parts of a paint film of the aluminum alloy profile obtained through the preparation method is small.

Description

Technical Field

[0001] The invention relates to the technical field of color matte photophoretic aluminum alloy profiles, and in particular to a color matte photophoretic aluminum alloy profile and a preparation method thereof. Background Art

[0002] Color electrophoretic coating technology is based on ordinary anodic transparent electrophoretic coating, and color paste is added to the electrophoretic paint. Matt electrophoretic paint is usually composed of high gloss paint and low gloss paint. The degree of matting of the electrophoretic coating film can be adjusted by changing the ratio of high gloss paint and low gloss paint. The current method to achieve the matting effect is to form insoluble intra-particle microgels in the resin used for electrophoretic coatings, thereby achieving the purpose of matting. In the color matting electrophoresis process, the anodized aluminum alloy is used as the anode, and anodic electrophoresis is performed under the action of direct current. Under the action of the electric field, the charged paint particles move toward the coated object, causing the electrophoretic paint to precipitate on the surface of the aluminum alloy to form a layer of paint film. The difference between matting color electrophoresis and ordinary electrophoresis and matting electrophoresis is that the addition of color paste to the electrophoretic paint changes the characteristics of the transparent electrophoretic paint film. The color paste is a ground pigment. It is difficult to detect its content by chemical methods during the production process to control the effective range and thus control the color difference floating amount, resulting in increased production control costs and increased instability. The factory cannot directly detect the color paste content in the electrophoresis tank liquid, and can only estimate it by observing the color changes and output during the production process, which increases the variable of controlling the color depth. If too much color paste is added, the electrophoresis paint film thickness remains unchanged and the color becomes darker under the basic process conditions such as the same time and voltage unit. If the color is to be consistent with the color plate, the film thickness needs to be reduced, but the paint film thickness does not meet the standard requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a color matte electrophoretic aluminum alloy profile, wherein the color difference of the paint film of the prepared profile is small at different locations.

[0004] The technical problem to be solved by the present invention is also to provide a color matte electrophoretic aluminum alloy profile, the color difference of the paint film at different locations is small.

[0005] In order to solve the above problems, the present invention provides a method for preparing a color matte electrophoretic aluminum alloy profile, comprising the following steps:

[0006] Provide aluminum alloy profile blanks;

[0007] Performing sandblasting on the aluminum alloy profile blank;

[0008] The aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0009] The first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0010] The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.49wt%-0.55wt%, Si 0.35wt%-0.41wt%, Fe≤0.1wt%, Cu 0.15wt%-0.2wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0011] In some embodiments, the sandblasting process includes: feeding the aluminum alloy profile into a sandblasting device, wherein the sandblasting device is provided with a sandblasting gun at an upper left position, a sandblasting gun at an upper right position, a sandblasting gun at a lower left position, and a sandblasting gun at a lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile.

[0012] In some embodiments, the sand shot is a sand shot with a size of 0.075 mm to 0.15 mm.

[0013] In some embodiments, the setting frequency of the sandblasting gun at the upper left position is 30HZ to 31HZ;

[0014] The setting frequency of the sandblasting gun at the upper right position is 30HZ~31HZ;

[0015] The setting frequency of the sandblasting gun at the lower left position is 30HZ~31HZ;

[0016] The setting frequency of the sandblasting gun at the lower right position is 30HZ~31HZ;

[0017] The feeding speed of aluminum alloy profiles is 24HZ~25HZ.

[0018] In some embodiments, the pretreatment includes degreasing cleaning, acid cleaning and / or alkali cleaning, and pure water cleaning;

[0019] The oxidation coloring treatment includes sulfuric acid anodizing and uniform coloring.

[0020] In some embodiments, the color matte electrophoresis includes: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank.

[0021] In some embodiments, the bath temperature of the electrophoretic coating is 20° C. to 23° C., the electrophoretic immersion time is ≥30 s, and the power-on time is 3 min to 5 min.

[0022] In some embodiments, the color matte electrophoresis further comprises: placing the first blank into an electrophoresis tank for electrophoretic coating, and then performing a water washing treatment.

[0023] In some embodiments, the water washing temperature of the water washing treatment is 22° C. to 25° C., and the water washing time is 3 min to 5 min.

[0024] In order to solve the above problems, the present invention further provides a color matte photophoretic aluminum alloy profile, and the color matte photophoretic aluminum alloy profile is prepared by the above-mentioned preparation method of the color matte photophoretic aluminum alloy profile.

[0025] The implementation of the present invention has the following beneficial effects:

[0026] The color matte electrophoretic aluminum alloy profile and preparation method thereof provided by the present invention achieve small color difference at various locations of the obtained color matte electrophoretic aluminum alloy profile through formula design of aluminum alloy profile blank, sandblasting process control and color matte electrophoretic process control, thereby ensuring the stability of electrophoretic film thickness and color consistency. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "back surface", "front surface" and the like indicate orientations or positional relationships only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the present invention, “preferred” is only used to describe an implementation method or example with better effects, and it should be understood that it does not constitute a limitation on the protection scope of the present invention.

[0031] In the present invention, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0032] The present invention provides a method for preparing a color matte photophoretic aluminum alloy profile, comprising the following steps:

[0033] S1. Provide aluminum alloy profile blanks;

[0034] In some embodiments, the aluminum alloy profile blank includes the following components in mass percentage: Mg 0.49wt%~0.55wt%, Si 0.35wt%~0.41wt%, Fe≤0.1wt%, Cu 0.15wt%~0.2wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0035] It should be noted that the color electrophoresis surface has strict requirements, and obvious surface defects such as lines, shadows, and black lines on the profile surface should not appear. The present invention performs sandblasting on the surface before the color electrophoresis material is pre-treated and oxidized and colored. The surface quality of the substrate blank affects the surface gloss after sandblasting. In particular, the hardness of the aluminum alloy substrate has a greater impact on the kinetic energy and impact depth of the shot peening impacting the substrate surface. The higher the substrate hardness, the smaller the impact pit area of ​​the sand shot and the shallower the pit depth. The shallower sand shot depth is conducive to reducing the wavelength scattering loss of light refraction and reflected light, and the sand surface is delicate and has a strong metallic texture. The inventor has repeatedly tested the use of different alloy grades and multiple component formulas and concluded that the aluminum alloy profile blank using the above formula can be more conducive to the subsequent sandblasting effect and color matting electrophoresis, and help reduce the color difference of the paint film. In the above formula, sufficient copper can inhibit the extrusion effect and improve plasticity, reduce the shear force between the metal and the working belt during the extrusion molding process, reduce friction with the working belt, improve the uniformity of the surface organization, and prevent common extrusion surface defects such as abnormal color separation of mechanical grain organization. Combined with the cast rod peeling technology, the surface of the extruded material base material is made oily, bright, smooth and burr-free.

[0036] S2, performing sandblasting on the aluminum alloy profile blank;

[0037] In some embodiments, the sandblasting process includes: feeding the aluminum alloy profile into a sandblasting device, wherein the sandblasting device is provided with a sandblasting gun at an upper left position, a sandblasting gun at an upper right position, a sandblasting gun at a lower left position, and a sandblasting gun at a lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile.

[0038] In some embodiments, the sand shot is 0.075mm-0.15mm sand shot. In some embodiments, the setting frequency of the sandblasting gun at the upper left position is 30HZ-31HZ; the setting frequency of the sandblasting gun at the upper right position is 30HZ-31HZ; the setting frequency of the sandblasting gun at the lower left position is 30HZ-31HZ; the setting frequency of the sandblasting gun at the lower right position is 30HZ-31HZ; the feeding speed of the aluminum alloy profile is 24HZ-25HZ. Preferably, the setting frequency of the sandblasting gun at the upper left position is 31HZ; the setting frequency of the sandblasting gun at the upper right position is 31HZ; the setting frequency of the sandblasting gun at the lower left position is 31HZ; the setting frequency of the sandblasting gun at the lower right position is 31HZ; the feeding speed of the aluminum alloy profile is 24HZ. After adopting the above-mentioned sandblasting process, the obtained sand surface is full and dense, feels fine and has no roughness, has no impurities on the surface, no dragging of black sand surface, and no leakage at the bottom.

[0039] In the present invention, the sandblasting process adopts a sandblasting process for preventing positive and negative surfaces and a control method for improving the sandblasting brightness to reduce the color difference of the matte color electrophoresis surface. After sandblasting, a calibrated gloss meter is used to detect the gloss of the sand surface on the front and back sides of the aluminum alloy profile blank, and the gloss consistency of the sand surface is judged by gloss data analysis. The probability of positive and negative surfaces appearing on the sand surface with a difference of more than 3° is very high. At this time, the setting parameters of the sandblasting gun need to be adjusted to further improve the consistency of the sand surface.

[0040] S3, the aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0041] In some embodiments, the pretreatment includes degreasing cleaning, pickling and / or alkali cleaning, and pure water cleaning; wherein, degreasing cleaning includes using a detergent or clean water to thoroughly clean the aluminum alloy surface, and removing oil and impurities. Alkaline cleaning or pickling includes using acid or alkali to further clean the surface. Pure water washing includes using pure water to clean the surface multiple times to ensure that there is no residue. The pretreatment ensures that the surface of the aluminum alloy profile blank is clean, free of oil and impurities before oxidation coloring and color matting electrophoresis, providing a good base for subsequent electrophoretic coating.

[0042] In some embodiments, the oxidation coloring treatment includes sulfuric acid anodizing and uniform coloring. Among them, sulfuric acid anodizing is to anodize the aluminum alloy in a sulfuric acid solution to form a dense oxide film. Uniform coloring is to use a single nickel salt uniform coloring technology to color the oxide film. After the pretreatment is completed, the surface of the aluminum alloy needs to be oxidized and colored to enhance the adhesion and aesthetics of the coating.

[0043] S4, the first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0044] In some embodiments, the color matte electrophoresis includes: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank.

[0045] The temperature of the bath directly affects the stability of the electrophoretic paint bath and the quality of the paint film. When the bath temperature is too low, the viscosity of the bath increases, and the bubbles on the surface of the coated object are not easy to be discharged, which may cause the coating film to become thinner or even not be painted; as the bath temperature rises, the bath stability decreases, the solvent evaporates faster, the paint film thickness increases, and the orange peel phenomenon is prone to occur. In some embodiments, the bath temperature of the electrophoretic coating is 20℃~23℃, the electrophoretic immersion time is ≥30s, and the power-on time is 3min~5min. Within the above range, it can be ensured that the paint forms a uniform and dense coating on the surface of the workpiece.

[0046] In some embodiments, the color matte electrophoresis further comprises: placing the first blank into an electrophoresis tank for electrophoresis coating, and then washing it with water. In some embodiments, the water washing temperature of the water washing treatment is 22° C. to 25° C., and the water washing time is 3 min to 5 min.

[0047] In some embodiments, the electrophoretic tank liquid includes acrylic resin, amino resin, color paste and solvent. It should be noted that in the electrophoretic tank, the aluminum alloy serves as the cathode and forms an electric field with the anode. The charged particles in the tank liquid move toward the cathode under the action of the electric field and are deposited on the surface of the aluminum alloy to form a coating. In the mass production process, the solid components of the electrophoretic tank liquid are consumed, the amount of liquid carried in and out of the tank, and the color paste concentration is continuously consumed. As the production volume increases, the color gradually becomes lighter under the same tank temperature, voltage, Ph, solid content and film thickness.

[0048] In order to solve the above problems, the present invention provides a method for quickly replenishing and adjusting color paste without using chemical detection:

[0049] First, in some embodiments, the amount of the color paste added includes a design addition value and an equipment loss value. The design addition value is the amount of color paste added when a standard color plate is made according to a standard process, and the equipment loss value is 0.3% to 0.8%. The equipment loss value includes the impact of the activation of electrophoresis refining equipment, filtration equipment, and recovery equipment on the color paste loss. Among them, the design addition value is added when preparing the electrophoresis tank liquid. When the acrylic resin and amino resin post-solvent in the electrophoresis tank liquid are subsequently supplemented, the color paste of the corresponding proportion is supplemented again according to the weight of the added supplement to ensure the percentage of the color paste content in the electrophoresis tank liquid.

[0050] In some embodiments, the color paste includes the following components in parts by weight: 90 to 97 parts of bisphenol A epoxy resin, 10 to 20 parts of colored fillers, and 1 to 5 parts of dibutyl tin oxide. Among them, bisphenol A epoxy resin is an important resin component in the color paste, which has good adhesion, chemical resistance and mechanical strength. In the color paste, it mainly plays the role of bonding pigment particles and enhancing the adhesion and hardness of the coating. At the same time, epoxy resin can also improve the weather resistance and corrosion resistance of the coating. Colored fillers include titanium dioxide, carbon black, pigments, etc., which give the coating color. Dibutyl tin oxide is used as a stabilizer in the color paste to improve the hardness and weather resistance of the coating. The amount of dibutyl tin oxide added needs to be precisely controlled. Too much or too little will have an adverse effect on the performance of the coating. For example, too much dibutyl tin oxide may cause the coating to cure prematurely or generate internal stress; while too little dibutyl tin oxide may not achieve the expected cross-linking effect.

[0051] Secondly, in some embodiments, the amount of the color paste added is adjusted according to the actual paint film thickness and the color difference between the actual paint film color and the standard color plate. For example, when the solid content of the electrophoretic bath is at the upper limit, when the paint film color is lighter under the same paint film thickness, it is necessary to add color paste separately and in small amounts multiple times. The standard color plate made by the standard process when the bath liquid is configured is used as a reference, and the standard color plate model is re-produced, and then the color corresponding to the thickness of the electrophoretic paint film is referred to. The standard plate and the test plate are analyzed in combination with a colorimeter to evaluate the amount of color paste added. If fine-tuning is required after evaluation, it can be accurately added through the beaker scale.

[0052] Finally, to reduce the amount of electrophoresis main tank liquid carried out and reduce color paste loss, the operator should determine the dripping time based on the content of the main tank solvent, and extend the dripping time on the basis that the material cannot dry out, reduce the tank liquid carried into the RO1 washing tank, and prevent the color paste from being consumed too quickly.

[0053] In addition, the color difference stability control is achieved by controlling the voltage in the color extinction photophoresis.

[0054] In some embodiments, in the color matting electrophoresis, the set voltage of the conventional cross-section cavity profile is 180V to 250V; the set voltage of the wide cross-section cavity profile should be 5V to 15V lower than the set voltage of the conventional cross-section cavity profile; the set voltage of the narrow cross-section cavity profile should be 5V to 15V higher than the set voltage of the conventional cross-section cavity profile.

[0055] In summary, the color matte photophoretic aluminum alloy profile and the preparation method thereof provided by the present invention, through the formula design of the aluminum alloy profile blank, the control of the sandblasting process and the color matte photophoretic process control, the color difference of each part of the obtained color matte photophoretic aluminum alloy profile is small, ensuring the stability of the electrophoretic film thickness and the color consistency. Correspondingly, the present invention also provides a color matte photophoretic aluminum alloy profile, and the color matte photophoretic aluminum alloy profile is prepared by the above-mentioned preparation method of the color matte photophoretic aluminum alloy profile.

[0056] The present invention is further described below with reference to specific embodiments.

[0057] Example 1

[0058] This embodiment provides a method for preparing a color matte photophoretic aluminum alloy profile, comprising the following steps:

[0059] S1. Provide aluminum alloy profile blanks;

[0060] The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.5wt%, Si 0.4wt%, Fe≤0.1wt%, Cu 0.18wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0061] S2, performing sandblasting on the aluminum alloy profile blank;

[0062] The aluminum alloy profile is fed into a sandblasting device, which is provided with a sandblasting gun at the upper left position, a sandblasting gun at the upper right position, a sandblasting gun at the lower left position, and a sandblasting gun at the lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile. The sand pellets are 200 meshes, the setting frequency of the sandblasting gun at the upper left position is 31HZ, the setting frequency of the sandblasting gun at the upper right position is 31HZ, the setting frequency of the sandblasting gun at the lower left position is 31HZ, the setting frequency of the sandblasting gun at the lower right position is 31HZ, and the feeding speed of the aluminum alloy profile is 24HZ.

[0063] S3, the aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0064] S4, the first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0065] The color matte electrophoresis includes: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank; the tank temperature of the electrophoretic coating is 23° C., the electrophoretic immersion time is ≥30s, and the power-on time is 4min.

[0066] The electrophoresis tank liquid comprises acrylic resin, amino resin, color paste and solvent.

[0067] The amount of color paste added includes the design addition value and the equipment loss value. The design addition value is the amount of color paste added when the standard color plate is made according to the standard process, and the equipment loss value is 0.5%. The amount of color paste added is adjusted according to the actual paint film thickness and the color difference between the actual paint film color and the standard color plate. The set voltage of the color matte electrophoresis is 220V.

[0068] Example 2

[0069] This embodiment provides a method for preparing a color matte photophoretic aluminum alloy profile, comprising the following steps:

[0070] S1. Provide aluminum alloy profile blanks;

[0071] The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.49wt%, Si 0.35wt%, Fe≤0.1wt%, Cu 0.15wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0072] S2, performing sandblasting on the aluminum alloy profile blank;

[0073] The aluminum alloy profile is fed into a sandblasting device, which is provided with a sandblasting gun at the upper left position, a sandblasting gun at the upper right position, a sandblasting gun at the lower left position, and a sandblasting gun at the lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile. The sand pellets are 200 meshes, the setting frequency of the sandblasting gun at the upper left position is 31HZ, the setting frequency of the sandblasting gun at the upper right position is 31HZ, the setting frequency of the sandblasting gun at the lower left position is 31HZ, the setting frequency of the sandblasting gun at the lower right position is 31HZ, and the feeding speed of the aluminum alloy profile is 24HZ.

[0074] S3, the aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0075] S4, the first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0076] The color matte electrophoresis includes: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank; the tank temperature of the electrophoretic coating is 22° C., the electrophoretic immersion time is ≥30s, and the power-on time is 4min.

[0077] The electrophoresis tank liquid comprises acrylic resin, amino resin, color paste and solvent.

[0078] The amount of color paste added includes the design addition value and the equipment loss value. The design addition value is the amount of color paste added when the standard color plate is made according to the standard process, and the equipment loss value is 0.5%. The amount of color paste added is adjusted according to the actual paint film thickness and the color difference between the actual paint film color and the standard color plate. The set voltage of the color matte electrophoresis is 220V.

[0079] Example 3

[0080] This embodiment provides a method for preparing a color matte photophoretic aluminum alloy profile, comprising the following steps:

[0081] S1. Provide aluminum alloy profile blanks;

[0082] The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.55wt%, Si 0.41wt%, Fe≤0.1wt%, Cu 0.2wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0083] S2, performing sandblasting on the aluminum alloy profile blank;

[0084] The aluminum alloy profile is fed into a sandblasting device, which is provided with a sandblasting gun at the upper left position, a sandblasting gun at the upper right position, a sandblasting gun at the lower left position, and a sandblasting gun at the lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile. The sand pellets are 200 meshes, the setting frequency of the sandblasting gun at the upper left position is 31HZ, the setting frequency of the sandblasting gun at the upper right position is 31HZ, the setting frequency of the sandblasting gun at the lower left position is 31HZ, the setting frequency of the sandblasting gun at the lower right position is 31HZ, and the feeding speed of the aluminum alloy profile is 24HZ.

[0085] S3, the aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0086] S4, the first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0087] The color matte electrophoresis includes: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank; the tank temperature of the electrophoretic coating is 21° C., the electrophoretic immersion time is ≥30s, and the power-on time is 3min.

[0088] The electrophoresis tank liquid comprises acrylic resin, amino resin, color paste and solvent.

[0089] The amount of color paste added includes the design addition value and the equipment loss value. The design addition value is the amount of color paste added when the standard color plate is made according to the standard process, and the equipment loss value is 0.5%. The amount of color paste added is adjusted according to the actual paint film thickness and the color difference between the actual paint film color and the standard color plate. The set voltage of the color matte electrophoresis is 220V.

[0090] Comparative Example 1

[0091] This comparative example provides a method for preparing a color matte photophoretic aluminum alloy profile, comprising the following steps:

[0092] S1. Provide aluminum alloy profile blanks;

[0093] The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.9wt%, Si 0.2wt%, Fe≤0.15wt%, Cu 0.2wt%, Mn≤0.05wt%, Zn≤0.05wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0094] S2, performing sandblasting on the aluminum alloy profile blank;

[0095] The aluminum alloy profile is fed into a sandblasting device, which is provided with a sandblasting gun at the upper left position, a sandblasting gun at the upper right position, a sandblasting gun at the lower left position, and a sandblasting gun at the lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile. The sand pellets are 200 meshes, the setting frequency of the sandblasting gun at the upper left position is 31HZ, the setting frequency of the sandblasting gun at the upper right position is 31HZ, the setting frequency of the sandblasting gun at the lower left position is 31HZ, the setting frequency of the sandblasting gun at the lower right position is 31HZ, and the feeding speed of the aluminum alloy profile is 24HZ.

[0096] S3, the aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank;

[0097] S4, the first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product;

[0098] The color matte electrophoresis comprises: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank.

[0099] The electrophoresis tank liquid comprises acrylic resin, amino resin, color paste and solvent.

[0100] The amount of color paste added includes the design addition value and the equipment loss value. The design addition value is the amount of color paste added when the standard color plate is made according to the standard process, and the equipment loss value is 0.5%. The amount of color paste added is adjusted according to the actual paint film thickness and the color difference between the actual paint film color and the standard color plate. The set voltage of the color matte electrophoresis is 220V.

[0101] The paint film thickness and color difference analysis were performed on the color matte electrophoretic aluminum alloy profiles prepared in Examples 1 to 3 and Comparative Example 1. Points on the surface of the aluminum alloy profile were measured using a colorimeter. The analysis results are shown in Table 1.

[0102] Table 1 Color difference analysis results of the color matte electrophoretic aluminum alloy profiles prepared in Examples 1 to 3 and Comparative Example 1

[0103] Example 1 Example 2 Example 3 Comparative Example 1 Color difference value △E 1.5 1.8 1.6 4.2 Film thickness (mm) 15 18 20 10

[0104] In summary, the colored matte electrophoretic aluminum alloy profile and preparation method thereof provided by the present invention, through the formula design of the aluminum alloy profile blank, the control of the sandblasting process and the color matte electrophoretic process, the color difference of each part of the obtained colored matte electrophoretic aluminum alloy profile is small, thereby ensuring the stability of the electrophoretic film thickness and the color consistency.

[0105] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] In addition, the above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a color matte photophoretic aluminum alloy profile, characterized in that: The following steps are involved: Provide aluminum alloy profile blanks; Performing sandblasting on the aluminum alloy profile blank; The aluminum alloy profile blank after sandblasting is subjected to pretreatment and oxidation coloring treatment to obtain a first blank; The first blank is subjected to color matting electrophoresis, washing, drying and cooling to obtain a finished product; The aluminum alloy profile blank comprises the following components in terms of mass percentage: Mg 0.49wt%-0.55wt%, Si 0.35wt%-0.41wt%, Fe≤0.1wt%, Cu 0.15wt%-0.2wt%, Mn≤0.05wt%, Cr≤0.05wt%, Zn≤0.05wt%, total impurity content ≤0.15wt%, and the balance is Al.

2. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 1, characterized in that: The sandblasting process includes: sending the aluminum alloy profile into a sandblasting device, wherein the sandblasting device is provided with a sandblasting gun at an upper left position, a sandblasting gun at an upper right position, a sandblasting gun at a lower left position, and a sandblasting gun at a lower right position, and the sandblasting gun sprays sand pellets to impact the aluminum alloy profile.

3. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 2, characterized in that: The sand shot is 0.075mm-0.15mm sand shot.

4. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 2, characterized in that: The setting frequency of the sandblasting gun at the upper left position is 30HZ~31HZ; The setting frequency of the sandblasting gun at the upper right position is 30HZ~31HZ; The setting frequency of the sandblasting gun at the lower left position is 30HZ~31HZ; The setting frequency of the sandblasting gun at the lower right position is 30HZ~31HZ; The feeding speed of aluminum alloy profiles is 24HZ~25HZ.

5. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 1, characterized in that: The pre-treatment includes degreasing cleaning, acid cleaning and / or alkali cleaning, and pure water cleaning; The oxidation coloring treatment includes sulfuric acid anodizing and uniform coloring.

6. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 1, characterized in that: The color matte electrophoresis comprises: placing the first blank into an electrophoresis tank for electrophoretic coating to form a paint film on the surface of the first blank.

7. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 6, characterized in that: The bath temperature of the electrophoretic coating is 20° C. to 23° C., the electrophoretic immersion time is ≥30s, and the power-on time is 3min to 5min.

8. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 6, characterized in that: The color matte electrophoresis also includes: placing the first blank into an electrophoresis tank for electrophoretic coating, and then washing it with water.

9. The method for preparing a color matte photophoretic aluminum alloy profile according to claim 8, characterized in that: The water washing temperature of the water washing treatment is 22° C. to 25° C., and the water washing time is 3 min to 5 min.

10. A method for preparing a color matte photophoretic aluminum alloy profile, characterized in that: The color matte photophoretic aluminum alloy profile is prepared by the method for preparing the color matte photophoretic aluminum alloy profile according to any one of claims 1 to 10.