A color aluminum pigment, a preparation method and application thereof

Abstract

The application discloses a kind of color aluminum pigment and its preparation method and application, the color aluminum pigment includes aluminum silver paste, first polymer resin layer coated on the surface of aluminum silver paste, organic dye layer and second polymer resin layer, the surface of first polymer resin layer is modified with acid group, the color aluminum pigment is prepared by the following preparation method: preparation is coated with first polymer resin layer aluminum powder;First polymer resin layer coated aluminum powder is modified on surface, to obtain surface-modified aluminum powder;Organic dye is air-impingement coated with the surface-modified aluminum powder, to obtain color aluminum pigment base;Second polymer resin layer is coated on the surface of the color aluminum pigment base again.The aluminum pigment is coated by multiple layers, air-impingement coated with organic dye and the surface-modified aluminum powder, has excellent aging resistance, and color is bright, and pigment is not easy to fall off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum pigment, in particular to a color aluminum pigment and a preparation method and application thereof. BACKGROUND

[0002] The color aluminum pigment has the characteristics of bright color, strong corrosion resistance, not easy to fade and strong metal luster, and can be used in different fields such as automobiles, building materials, house decoration, paint, printing ink, instrument equipment and household appliances.

[0003] At present, the methods for preparing the color aluminum pigment mainly include blending method, physical adsorption method and coating film method. The blending method is to simply mix the aluminum pigment and other dyes, but the adsorption of the dyes on the aluminum pigment is poor and the dyes are easy to fade. The physical adsorption method is to form a porous structure on the surface of the aluminum pigment so that the organic dyes and inorganic colorants are adsorbed in the porous structure to reduce the risk of desorption, but the effective combination of the aluminum pigment and the dyes at the microscale is still not solved. In the preparation process by using the coating method, the organic dyes are usually introduced into the film layer by physical doping or chemical grafting, which not only has a complex operation process, but also causes the phase separation of the dye molecules in the polymer film by physical doping, and the local supersaturation caused by the concentration gradient of the grafting sites by chemical grafting, which will result in poor light aging resistance and easy fading caused by photodegradation, and the color saturation is also affected by the coating process to a certain extent. SUMMARY

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a color aluminum pigment and a preparation method and application thereof, which has a more environmentally friendly preparation process, and the obtained color aluminum pigment has excellent aging resistance, bright color, and the pigment is not easy to fall off, which can meet the customer's demand for aluminum pigment aging resistance and colorization.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0006] A color aluminum pigment, comprising an aluminum paste, a first polymer resin layer coated on the surface of the aluminum paste, an organic dye layer and a second polymer resin layer, the surface of the first polymer resin layer is modified with an acid group;

[0007] The color aluminum pigment is prepared by the following preparation method:

[0008] S1, dispersing the aluminum paste in a first solvent, adding acrylic acid, trimethylolpropane trimethacrylate, styrene monomer and initiator for polymerization reaction to obtain aluminum powder coated with a first polymer resin layer;

[0009] S2, dispersing the aluminum powder coated with the first polymer resin layer in di[2-(methacryloyloxy)ethyl] phosphate to obtain surface modified aluminum powder;

[0010] S3, air-impingement coating the organic dye with the surface-modified aluminum powder to obtain a colored aluminum pigment base;

[0011] S4, dispersing the colored aluminum pigment base in a second solvent, adding acrylic acid, hydroxymethylpropane triacrylate, styrene monomer, and an initiator to perform a polymerization reaction, to obtain a colored aluminum pigment having a second polymer resin layer.

[0012] According to an aspect of the present application, the mass ratio of the surface-modified aluminum powder to the organic dye is 1: (0.4-0.5).

[0013] According to an aspect of the present application, the mass ratio of the acrylic acid, the hydroxymethylpropane triacrylate, the styrene monomer, and the initiator is 1: (10-12): (4-5): 1.

[0014] According to an aspect of the present application, the organic dye is any one of a monoazo pigment, a disazo pigment, a benzimidazolone pigment, a quinacridone pigment, or a phthalocyanine pigment.

[0015] According to an aspect of the present application, the first solvent and the second solvent are oil-based solvents. Specifically, MS-mineral oil or SN-naphtha can be selected.

[0016] According to an aspect of the present application, the aluminum paste has a diameter-thickness ratio of 40-200 and a particle size of 5-60 μm.

[0017] The above method for preparing a colored aluminum pigment includes the following steps:

[0018] dispersing the aluminum paste in an oil-based solvent, adding acrylic acid, hydroxymethylpropane triacrylate, styrene monomer, and an initiator to perform a polymerization reaction, to obtain aluminum powder coated with a first polymer resin layer;

[0019] dispersing the aluminum powder coated with the first polymer resin layer in di[2-(methacryloyloxy)ethyl] phosphate to obtain surface-modified aluminum powder;

[0020] air-impingement coating the organic dye with the surface-modified aluminum powder to obtain a colored aluminum pigment base;

[0021] dispersing the colored aluminum pigment base in an oil-based solvent, adding acrylic acid, hydroxymethylpropane triacrylate, styrene monomer, and an initiator to perform a polymerization reaction, to obtain a colored aluminum pigment having a second polymer resin layer.

[0022] According to an aspect of the present application, the aluminum paste is pretreated before being dispersed.

[0023] According to one aspect of the present application, the pre-treatment comprises weighing the aluminum paste for cleaning, suction filtration, and drying.

[0024] Use of the above-mentioned colored aluminum pigment or the colored aluminum pigment prepared by the above-mentioned preparation method in a coating.

[0025] Advantages of the present application:

[0026] 1. The organic dye is air-impinged coated with the surface-modified aluminum powder, the organic dye is combined more closely and firmly with the surface-modified aluminum powder, the color is more bright, is not easy to fall off and separate, and no solvent is needed, which is more environmentally friendly.

[0027] 2. The self-crosslinking polyacrylic resin is synthesized on the surface of the aluminum pigment by a free radical solution polymerization method, then the aluminum powder coated with the first polymer resin layer is dispersed in di[2-(methacryloyloxy)ethyl] phosphate, the surface of the aluminum pigment is coated and modified by using the phase separation principle of the polymer solution, the surface of the aluminum pigment has good affinity, which is beneficial to the adsorption of the organic dye, and the colored aluminum pigment with more bright color and more rich color phase is obtained.

[0028] 3. The first polymer resin layer coating, acid group modification on the surface of the first polymer resin layer, and the second polymer resin layer encapsulation are sequentially performed, which is beneficial to obtain the colored aluminum pigment with bright color, rich color phase, and stable structure. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0030] Figure 1 The schematic diagram of the appearance of the colored aluminum pigment described in Example 1.

[0031] Figure 2 The SEM diagram of the colored aluminum pigment described in Example 1.

[0032] Figure 3 The schematic diagram of the squeegee effect of the blue aluminum pigment prepared in Example 1. DETAILED DESCRIPTION

[0033] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] A color aluminum pigment includes an aluminum slurry, a first polymer resin layer coated on the surface of the aluminum slurry, an organic dye layer, and a second polymer resin layer. The surface of the first polymer resin layer is modified with an acid group. Specifically, the organic dye can be selected according to the actual application scenario. For example, monoazo pigments such as fast yellow G (P.Y.1), permanent orange RN (P.O.5), and toluidine red (P.R.3) can be selected; disazo pigments such as benzidine yellow G (P.Y.12), permanent yellow HR (P.Y.83), and permanent orange F2G (P.O.34) can be selected; benzimidazolone pigments such as permanent orange HSL (P.O.36) and pigment yellow 181 (P.Y.181) can be selected; quinacridone pigments such as phthalocyanine red (P.R.122) and phthalocyanine violet (P.V.19) can be selected; and phthalocyanine pigments such as phthalocyanine blue can be selected.

[0035] In practical applications, the ratio of diameter to thickness of the aluminum slurry is 40-200, and the particle size is 5-60 μm.

[0036] In practical applications, the shape of the aluminum slurry can be a silver dollar type or a scale shape. In order to impart excellent metallic luster and brightness to the color aluminum pigment product, the silver dollar type is preferred.

[0037] The preparation method of the color aluminum pigment includes the following steps:

[0038] The aluminum slurry is weighed, cleaned with a first solvent, then filtered and dried to obtain cleaned aluminum pigment. The cleaned aluminum pigment is dispersed in an oily solvent, and acrylic acid, trimethylolpropane trimethacrylate, styrene monomer, and an initiator are added to perform a polymerization reaction to obtain aluminum powder coated with a first polymer resin layer.

[0039] The aluminum powder coated with the first polymer resin layer is dispersed in di[2-(methacryloyloxy)ethyl] phosphate to obtain surface-modified aluminum powder.

[0040] The surface-modified aluminum powder is subjected to air impact coating with an organic dye to obtain a color aluminum pigment base.

[0041] The color aluminum pigment base is dispersed in a second solvent, and acrylic acid, trimethylolpropane triacrylate, styrene monomer, and an initiator are added to perform a polymerization reaction to obtain a color aluminum pigment with a second polymer resin layer.

[0042] In practical applications, the air impact coating of the surface-modified aluminum powder and the organic dye includes: weighing the surface-modified aluminum powder and the organic dye according to a mass ratio of 1: (0.4-0.5), and then adding them into a MEM precision mixer for air impact coating. In this process, the mixing time is set to 1-4 hours, the temperature is 38-42℃, the gas consumption is 20-50L / min, and the running process is protected by inert gas. The surface-modified aluminum powder and the organic dye are dispersed and strongly mixed by air fluidization in the MEM precision mixer, so that the organic dye is adsorbed on the surface-modified aluminum powder, and uniform and efficient coating is achieved.

[0043] In practical applications, the first solvent and the second solvent are both oil solvents. Specifically, MS-mineral oil or SN-naphtha can be selected. The selection of the initiator is not limited, and specifically, azobisisobutyronitrile and the like can be selected.

[0044] An application of the above-mentioned colored aluminum pigment or the colored aluminum pigment prepared by the above-mentioned preparation method in a powder coating.

[0045] Example One

[0046] A preparation method of a colored aluminum pigment includes the following steps:

[0047] S1: Preparation of AL / resin aluminum pigment

[0048] 100g of silver dollar type aluminum paste (aluminum paste model: ZX05GA, D50 particle size: 20µm, manufactured by Zhuxing) was weighed in a 500mL beaker and washed with 200g of MS-mineral oil, and then filtered to obtain a washed aluminum pigment. Then, the washed aluminum pigment was placed in 500g of MS-mineral oil, and stirred while injecting nitrogen to obtain a slurry. Then, the temperature was raised to 50-110℃, 0.072g of acrylic acid, 0.809g of trimethylolpropane triacrylate, 0.324g of styrene, and 0.075g of azobisisobutyronitrile were added to the slurry, and the reaction was run for 6-8h to make the monomers undergo free radical polymerization and form a free radical polymerizable resin on the surface of the aluminum pigment. After the reaction was completed, the slurry was filtered and washed with MS-mineral oil, and the filtered material was dried in an oven at 40-80℃ to obtain an AL / resin aluminum pigment.

[0049] S2: Surface modification of AL / resin

[0050] The AL / resin aluminum pigment obtained in step S1 is washed with MS-mineral oil, then 100 g of the washed AL / resin aluminum pigment is weighed into a 50 g propylene glycol methyl ether solution in which 0.1 g of bis[2-(methacryloyloxy)ethyl] phosphate is dissolved, and stirred at 50-110°C for 1 hour to obtain a slurry, the slurry is then suction filtered, and the precipitate is dried in an oven at 40-80°C to obtain a surface-modified aluminum powder.

[0051] S3: Phthalocyanine blue coloring on AL / resin

[0052] The surface-modified aluminum powder and the phthalocyanine blue are weighed in a ratio of 1:0.5 and then added to a MEM precision mixer for air impact coating, during which the mixing time is set to 1-4 hours, the temperature is 38-42°C, the gas flow is 20-50 L / min, and the running process is protected by nitrogen, so that the phthalocyanine blue is adsorbed on the surface-modified aluminum powder to obtain a blue aluminum pigment base.

[0053] S4: Secondary coating of the radical polymerization resin

[0054] Acrylic acid and styrene are mixed in a ratio of 1:1, the polymerization inhibitor is removed by passing through an alkaline alumina column to obtain refined monomers. 100 g of the blue aluminum pigment base is dispersed in 400 g of MS-mineral oil, 0.215 g of acrylic acid, 0.971 g of styrene, and 2.427 g of trimethylolpropane triacrylate are added, and under nitrogen protection, the monomers are subjected to radical polymerization by adding 0.089 g of azobisisobutyronitrile while heating and stirring at 50-110°C. After the polymerization is completed, an outermost resin coating layer is formed, the material is suction filtered to obtain a blue aluminum pigment of AL / resin / phthalocyanine blue / resin. Figure 1 The appearance of the blue aluminum pigment prepared in this example is shown in the following figure, Figure 2 The SEM image of the blue aluminum pigment prepared in this example is shown in the following figure.

[0055] 10 g of the blue aluminum pigment prepared in this example is added to 20 g of ethylene glycol monobutyl ether, then 80 g of acrylic resin is added and stirred uniformly, and then an appropriate amount of ethylene glycol monobutyl ether is added to adjust the viscosity to 15±2 s. A 100 µm wet cloth applicator is used to perform a blade coating on black and white card paper. Figure 3 The blade coating effect of the blue aluminum pigment prepared in this example is shown in the following figure.

[0056] Example Two

[0057] A method for preparing a colored aluminum pigment, comprising the following steps:

[0058] S1: Preparation of AL / resin aluminum pigment

[0059] 100 g of silver dollar type aluminum paste (aluminum paste type: ZX05GA, D50 particle size: 20 µm, manufactured by Zhuxing) was washed with 200 g of SN-naphtha in a 500 mL beaker, and then suction filtration was performed to obtain a washed aluminum pigment. The washed aluminum pigment was then placed in 500 g of solvent oil, and a slurry was obtained while stirring and injecting nitrogen. Then, 0.072 g of acrylic acid, 0.809 g of trimethylolpropane triacrylate, 0.324 g of styrene, and 0.075 g of azobisisobutyronitrile were added to the slurry, and the reaction was performed for 6 to 8 hours to allow radical polymerization of the monomers and form a radical polymerizable resin on the surface of the aluminum pigment. After the reaction was completed, the slurry was suction filtered and washed with SN-naphtha, and the material obtained by suction filtration was dried in an oven at 40 to 80°C to obtain an AL / resin aluminum pigment.

[0060] S2: Surface modification of AL / resin

[0061] The obtained AL / resin aluminum pigment was washed with SN-naphtha, and then 100 g of the washed AL / resin aluminum pigment was placed in a 50 g propylene glycol methyl ether solution in which 0.1 g of bis[2-(methacryloyloxy)ethyl] phosphate was dissolved, and a slurry was obtained by stirring at 50 to 110°C for 1 hour. The slurry was then suction filtered, and the precipitate was dried in an oven at 40 to 80°C to obtain a surface-modified aluminum powder.

[0062] S3: Phthalocyanine blue coloring on AL / resin

[0063] The surface-modified aluminum powder and phthalocyanine blue were weighed in a mass ratio of 1:0.4 and then added to a MEM precision mixer to perform air impact coating. In this process, the mixing time was set to 1 to 4 hours, the temperature was set to 38 to 42°C, the gas amount was set to 20 to 50 L / min, and nitrogen was used to protect the running process. As a result, the phthalocyanine blue was adsorbed on the surface-modified aluminum powder to obtain a blue aluminum pigment base.

[0064] S4: Secondary coating of radical polymerization resin

[0065] Acrylic acid and styrene were mixed in a ratio of 1:1, and a deactivator was removed by passing through an alkaline alumina column to obtain refined monomers. 100 g of the blue aluminum pigment base was dispersed in 400 g of SN-naphtha, and 0.215 g of acrylic acid, 0.971 g of styrene, and 2.427 g of trimethylolpropane triacrylate were added. Under nitrogen protection, the mixture was heated and stirred at 50 to 110°C while adding 0.089 g of azobisisobutyronitrile to allow radical polymerization of the monomers. After the polymerization was completed, an outermost resin coating layer was formed. The material was suction filtered to obtain an AL / resin / phthalocyanine blue / resin blue aluminum pigment.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that a scale-shaped aluminum paste (aluminum paste model: ZX3120, D50 particle size: 20 pm, made by Zhuxing) is selected, and the rest is the same as Example 1.

[0068] Comparative Example 2

[0069] The difference from Example 1 is that step S1 is omitted, and the rest is the same as Example 1, specifically:

[0070] S1: Surface modification of AL

[0071] 100 g of silver dollar-shaped aluminum paste (aluminum paste model: ZX05GA, D50 particle size: 20 pm, made by Zhuxing) is weighed in a 500 mL beaker and washed with 200 g of MS-mineral oil, then filtered under suction to obtain a washed aluminum pigment. 100 g of the washed aluminum pigment is added to a 50 g propylene glycol methyl ether solution containing 0.1 g of bis[2-(methacryloyloxy)ethyl] phosphate, and stirred at 50-110°C for 1 hour to obtain a slurry. The slurry is then filtered under suction, and the precipitate is dried in an oven at 40-80°C to obtain a surface-modified aluminum powder.

[0072] S2: Coloring of phthalocyanine blue on AL

[0073] The surface-modified aluminum powder and phthalocyanine blue are weighed in a ratio of 1:0.5 and then added to a MEM precision mixer for air impact coating. The mixing time is set to 1-4 hours, the temperature is 38-42°C, and the gas flow is 20-50 L / min. The process is protected by nitrogen gas to allow the phthalocyanine blue to adsorb onto the surface-modified aluminum powder, resulting in a blue aluminum pigment base.

[0074] S3: Coating of free radical polymerization resin

[0075] Acrylic acid and styrene are mixed in a ratio of 1:1, and the inhibitor is removed by passing through an alkaline alumina column to obtain refined monomers. 100 g of blue aluminum pigment base is dispersed in 400 g of MS-mineral oil, and 0.215 g of acrylic acid, 0.971 g of styrene, and 2.427 g of trimethylolpropane triacrylate are added. Under nitrogen protection, heat and stir at 50-110°C while adding 0.089 g of azobisisobutyronitrile to allow the monomers to undergo free radical polymerization. After the polymerization is complete, an outermost resin coating layer is formed. The material is filtered under suction to obtain a blue aluminum pigment of AL / phthalocyanine blue / resin.

[0076] Comparative Example 3

[0077] The difference from Example 1 is that in step S3: the surface-modified aluminum powder and phthalocyanine blue are weighed in a ratio of 1:0.3, then added to the MEM precision mixer for air impact coating, and the rest is the same as Example 1.

[0078] Comparative Example 4

[0079] The difference from Example 1 is that in step S3: the surface-modified aluminum powder and phthalocyanine blue are weighed in a ratio of 1:0.6, then added to the MEM precision mixer for air impact coating, and the rest is the same as Example 1.

[0080] Comparative Example 5

[0081] The difference from Example 1 is that step S3 is different, and the rest is the same as Example 1. Specifically, step S3 in Comparative Example 5 is as follows:

[0082] S3: Phthalocyanine blue coloring on AL / resin

[0083] In a three-necked flask, 50 g of phthalocyanine blue pigment as a coloring pigment, 0.05 g of o-phenylenediamine, and 100 g of MS-mineral oil are added, and the coloring pigment is dispersed by stirring for 3-5 hours. Then, 100 g of surface-modified aluminum powder, 400 g of solvent oil, and 0.25 g of Span 60 are added, and dispersed for 1 hour, and the slurry is washed with solvent oil, then filtered, and the precipitate is dried in an oven at 40-80°C to obtain a blue aluminum pigment base.

[0084] Comparative Example 6

[0085] The difference from Example 1 is that the inert gas nitrogen is reduced, and the rest is the same as Example 1.

[0086] Comparative Example 7

[0087] 100 g of silver dollar type aluminum silver paste (aluminum silver paste type: ZX05GA, D50 particle size: 20 µm, Zhuxing Manufacturing) is weighed in a 500 mL beaker and washed with 200 g of MS-mineral oil, then filtered, to obtain a washed aluminum pigment. The washed aluminum pigment and phthalocyanine blue pigment are weighed in a ratio of 1:0.5, then added to the MEM precision mixer for air impact coating, so that the phthalocyanine blue pigment is adsorbed on the aluminum pigment, to obtain a blue aluminum pigment.

[0088] Performance test:

[0089] The aluminum pigments obtained in Examples 1, 2, and Comparative Examples 1-7 are subjected to the following performance tests. Specifically, the performance detection method is as follows:

[0090] Chromaticity test: 10 g of aluminum pigment was added to 20 g of ethylene glycol monobutyl ether, then 80 g of acrylic resin was added, stirred uniformly, and then an appropriate amount of ethylene glycol monobutyl ether was added to adjust the viscosity to 15±2 s. A 100 µm wet cloth coater was used to perform a blade on a black and white card to obtain a coating film sample. After drying the coating film sample, a German BYK integral sphere colorimeter d:8° instrument was used to test the b* value of the coating film sample. The b value is a parameter in the color space, which is specifically used to describe the characteristics of color on the yellow-blue axis. The b value usually ranges from -60 to 60. When the b value is positive, it indicates that the color is yellowish. When the b value is negative, it indicates that the color is bluish. The larger the absolute value of the negative value, the more obvious the blue color.

[0091] Adhesion test: 10 g of aluminum pigment was added to 20 g of ethylene glycol monobutyl ether, then 80 g of acrylic resin was added, stirred uniformly, and then an appropriate amount of ethylene glycol monobutyl ether was added to adjust the viscosity to 15±2 s. A 100 µm wet cloth coater was used to perform a blade on a black and white card to obtain a coating film sample. After drying the coating film sample, a German BYK integral sphere colorimeter d:8° instrument was used to test the b* value of the coating film sample. The b value is a parameter in the color space, which is specifically used to describe the characteristics of color on the yellow-blue axis. The b value usually ranges from -60 to 60. When the b value is positive, it indicates that the color is yellowish. When the b value is negative, it indicates that the color is bluish. The larger the absolute value of the negative value, the more obvious the blue color.

[0092] Hiding power test: The test was performed according to the test method of GB / T 23981.2-2023 (Determination of the hiding power of pigments and varnishes - Part 2: Black and white panel method). When the hiding power value is ≥10000 cm² / g, it is considered to have strong hiding power. When the hiding power value is less than 10000 cm² / g, it is considered to have weak hiding power.

[0093] After testing, the performance test results are shown in Table 1 below.

[0094] Table 1

[0095]

[0096] By comparing the performance test results of Example 1 and Comparative Example 1, it can be known that the shape of the aluminum silver paste will affect the performance of the product. The effect of using silver dollar-shaped aluminum silver paste is better than that of using flake-shaped aluminum silver paste. By comparing the performance test results of Example 1 and Comparative Example 2, it can be known that coating a layer of polymer resin before modifying the aluminum-based surface is beneficial to forming aluminum pigments with high color saturation, bright color, good adhesion, aging resistance, and good hiding power.

[0097] By comparing the performance test results of example 1, comparative example 3 and comparative example 4, it can be known that when the organic dye is air-impingement coated with the surface-modified aluminum powder, the mass ratio of the organic dye to the surface-modified aluminum powder will affect the color saturation, adhesion, aging resistance and hiding power of the aluminum pigment.

[0098] By comparing the performance test results of example 1 and comparative example 5, it can be known that when the organic dye is air-impingement coated with the surface-modified aluminum powder, the color is more bright, the adhesion is good, the aging resistance and hiding power are good, and the process is simpler and more environmentally friendly.

[0099] By comparing the performance test results of example 1 and comparative example 6, it can be known that in the preparation process of the colored aluminum pigment, the nitrogen gas is used to intervene in the reaction, which is beneficial to form the aluminum pigment with high color saturation, good adhesion, aging resistance and hiding power.

[0100] By comparing the performance test results of example 1 and comparative example 7, it can be known that the setting of the coating layer and the modification treatment make the performance of the colored aluminum pigment more excellent, the color saturation is high, and the pigment is not easy to fall off.

[0101] The advantages of the embodiment of the present application are as follows:

[0102] 1. The organic dye is air-impingement coated with the surface-modified aluminum powder, the combination of the organic dye and the surface-modified aluminum powder is more close and firm, the color is more bright, and the organic dye is not easy to fall off and separate, and the process is more environmentally friendly without solvent.

[0103] 2. The self-crosslinking polyacrylic acid resin is synthesized on the surface of the aluminum pigment by the free radical solution polymerization method, then the aluminum powder coated with the first polymer resin layer is dispersed in di[2-(methacryloyloxy)ethyl] phosphate, the surface of the aluminum pigment is coated and modified by using the phase separation principle of the polymer solution, the surface of the aluminum pigment has good affinity, which is beneficial to the adsorption of the organic dye, and the colored aluminum pigment with more bright color and more rich color phase is obtained.

[0104] 3. The first polymer resin layer is coated, the acid group modification is performed on the surface of the first polymer resin layer, and the second polymer resin layer is encapsulated, which is beneficial to obtain the colored aluminum pigment with bright color, rich color phase and stable structure.

[0105] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A colored aluminum pigment, characterized in that, The silver dollar type aluminum paste, a first polymer resin layer coated on the surface of the silver dollar type aluminum paste, an organic dye layer, and a second polymer resin layer, wherein the surface of the first polymer resin layer is acid group modified; The color aluminum pigment is prepared by the following preparation method: The silver dollar type aluminum paste is dispersed in a first solvent, acrylic acid, trimethylolpropane trimethacrylate, styrene monomer, and initiator are added for polymerization reaction to obtain aluminum powder coated with a first polymer resin layer; The aluminum powder coated with the first polymer resin layer is dispersed in di[2-(methacryloyloxy)ethyl] phosphate to obtain surface modified aluminum powder; The organic dye is air impact coated with the surface modified aluminum powder to obtain a color aluminum pigment base, wherein the air impact coating is that the surface modified aluminum powder and the organic dye are mixed in a MEM precision mixer, and the organic dye is adsorbed on the surface modified aluminum powder by gas fluidization dispersion and gas impact collision to realize uniform coating, and the mass ratio of the surface modified aluminum powder to the organic dye is 1:(0.4-0.5); The color aluminum pigment base is dispersed in a second solvent, acrylic acid, trimethylolpropane triacrylate, styrene monomer, and initiator are added for polymerization reaction to obtain a color aluminum pigment with a second polymer resin layer.

2. A colored aluminum pigment according to claim 1, characterized in that The mass ratio of the acrylic acid, trimethylolpropane trimethacrylate, styrene monomer, and initiator is 1:(10-12):(4-5):

1.

3. The colored aluminum pigment according to claim 1, wherein The organic dye is any one of a monoazo pigment, a disazo pigment, a benzimidazolone pigment, a quinacridone pigment, or a phthalocyanine pigment.

4. The colored aluminum pigment according to claim 1, wherein The diameter-thickness ratio of the aluminum paste is 40-200, and the particle size is 5-60 μm.

5. The colored aluminum pigment according to claim 1, wherein The first solvent and the second solvent are oily solvents.

6. The method of claim 1, wherein the color aluminum pigment is prepared by the steps of: The method comprises the following steps: The silver dollar type aluminum paste is dispersed in a first solvent, acrylic acid, trimethylolpropane trimethacrylate, styrene monomer, and initiator are added for polymerization reaction to obtain aluminum powder coated with a first polymer resin layer; The aluminum powder coated with the first polymer resin layer is dispersed in di[2-(methacryloyloxy)ethyl] phosphate to obtain surface modified aluminum powder; The organic dye is air impact coated with the surface modified aluminum powder to obtain a color aluminum pigment base, wherein the air impact coating is that the surface modified aluminum powder and the organic dye are mixed in a MEM precision mixer, and the organic dye is adsorbed on the surface modified aluminum powder by gas fluidization dispersion and gas impact collision to realize uniform coating, and the mass ratio of the surface modified aluminum powder to the organic dye is 1:(0.4-0.5); The color aluminum pigment base is dispersed in a second solvent, acrylic acid, trimethylolpropane triacrylate, styrene monomer, and initiator are added for polymerization reaction to obtain a color aluminum pigment with a second polymer resin layer.

7. The method for preparing a colored aluminum pigment according to claim 6, characterized in that, The aluminum paste is pretreated before being dispersed.

8. The method for preparing a colored aluminum pigment according to claim 7, characterized in that, The pretreatment comprises weighing the aluminum paste, cleaning, suction filtration, and drying.

9. Use of the color aluminum pigment according to any one of claims 1-5 or prepared by the preparation method according to any one of claims 6-8 in a coating.

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