CN110305501A - A kind of preparation method of pigment-embedded multi-layer coated blue aluminum pigment - Google Patents

Abstract

The invention discloses a preparation method of a pigment-embedded multilayer-coated blue aluminum pigment. In the method, a sol-gel method is used to prepare an aluminum pigment coated with a single layer of silicon dioxide, and then a single layer of silicon dioxide is The coated aluminum pigment and phthalocyanine blue pigment are dispersed in solvent oil, and a surfactant is added at the same time, so that the pigment can be better adsorbed on the surface of the aluminum pigment coated with a single layer of silica, and then the initiator, fluorine-containing monolayer body and cross-linking monomer, after the reaction is completed, the blue aluminum pigment with multi-layer coating of pigment embedding type can be obtained by suction filtration. In the method, the organic pigment is embedded between the fluorine-silicon double-layer coating film by utilizing the good binding ability of the organic pigment and the fluorine-silicon, and the fluorine-containing polymer film can well protect the organic pigment. The pigment-embedded multilayer-coated blue aluminum pigment prepared by the method has bright colors and excellent acid and alkali resistance, and has broad application prospects.

Description

A kind of preparation method of pigment-embedded multi-layer coated blue aluminum pigment

technical field

The invention relates to the technical field of aluminum pigments, in particular to the preparation of a pigment-embedded multi-layer coated blue aluminum pigment.

Background technique

Aluminum pigment is a kind of ultra-thin flaky aluminum powder. The surface of flaky aluminum powder is smooth and smooth. It has excellent metallic luster, heterochromatic effect and reflection performance, and can reflect ultraviolet light, infrared light and visible light. It is the most widely used metal pigment at present. It is widely used in coatings, ink printing, plastics and other fields, and has good protection and decoration functions.

The flaky aluminum powder has small particles and a large specific surface area, and aluminum itself is relatively easy to react with oxygen and water in the air, as well as acid and alkali, so that the surface of the aluminum powder is corroded, which not only reduces the gloss of the aluminum powder surface, It also affects the metallic luster of the aluminum powder. These all limit the further use of aluminum pigments, so it is very necessary to modify the surface of aluminum pigments to improve their corrosion resistance and maintain their good metallic luster. In addition, the single silver-white color of aluminum pigments also limits its use. Therefore, it is a very important research direction to develop aluminum pigments of different colors.

Organic pigments are insoluble organic substances, which are usually added to the substrate in a highly dispersed state to color the substrate. The fundamental difference between it and dyes is that dyes can be dissolved in the dyeing medium used, while pigments are neither soluble in the medium in which they are used nor in the substrate to be colored. Organic pigments are bright in color, strong in coloring power, and non-toxic, but the light resistance, heat resistance, solvent resistance and migration resistance of some varieties are often inferior to inorganic pigments.

At present, the coloring methods of aluminum pigments are mainly divided into two types; one is to deposit inorganic pigments (such as iron oxide, cobalt oxide) by liquid phase deposition, and the colored aluminum pigments prepared by this method need to deposit a layer of metal oxide on the surface. Since the calcination treatment is required in the later stage, the dispersibility of the aluminum pigment in the resin and water medium will be deteriorated, which is not conducive to the preparation of the coating. The other is to first coat a layer of silicon dioxide on the surface of the aluminum powder or to coat the silicon dioxide and a silane coupling agent synergistically, and then deposit colored pigments to color the aluminum powder. Although this method is simple in process, it cannot The prepared aluminum pigment has poor stability and poor alkali resistance.

"A High Temperature Resistant Colored Aluminum Pigment" with publication number CN103849179A introduces a preparation method of a high temperature resistant color aluminum pigment. The surface of the aluminum powder is coated with a layer of titanium dioxide and ferric oxide in turn, washed with deionized water, dried Through a series of processes such as drying and calcination, a series of high-temperature-resistant colored aluminum pigments can be obtained from yellow to red in appearance and gold, red, purple, blue, green and other reflection colors. However, the stability of the metal oxide coating layer in acid and alkali is not high.

Contents of the invention

Aiming at the problems of poor acid and alkali resistance, poor compatibility with coating matrix, and poor color tone existing in the current technology, the invention provides a preparation method of an aluminum pigment colored with phthalocyanine blue and embedded with a fluorine-silicon double layer. This method utilizes the good binding ability of the phthalocyanine blue pigment and the fluorine-silicon double layer to embed the phthalocyanine blue pigment between the fluorine-silicon double layer. High gloss and good acid and alkali resistance and weather resistance.

The first aspect of the present invention provides a kind of preparation method of the blue aluminum pigment of pigment embedding type multilayer coating, comprises the following steps:

(1) Disperse the aluminum powder in absolute ethanol, heat and stir under the protection of an inert gas to react, after the reaction is completed, cool and suction filter to obtain the aluminum powder pigment;

(2) Disperse the aluminum powder pigment prepared in the step (1) into the alcohol-water mixing system and heat it, add tetraethyl silicate and catalyst dropwise at the same time, stir, after the reaction is completed, cool and suction filter to obtain silicon dioxide Layer-coated aluminum pigments;

(3) Disperse the silicon dioxide single-layer coated aluminum pigment, surfactant and phthalocyanine blue pigment prepared in step (2) in solvent oil, stir and heat under the protection of an inert gas; then add azo Initiator, fluorine-containing monomer and cross-linking agent, continue to stir, after the reaction is completed, cool and suction filter to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Preferably, in step (1), the stirring time is 3-6 hours, and the heating temperature is 60-80°C.

Preferably, in step (1), the mass ratio of aluminum powder to absolute ethanol is 1:2-1:4; more preferably, the mass ratio of aluminum powder to absolute ethanol is 1:3.

Preferably, in step (2), the stirring time is 3 to 6 hours, and the heating temperature is 60 to 80°C;

The alcohol-water mixing system is a mixture of absolute ethanol and water, and the volume ratio of absolute ethanol and water added is 1:1-3:1.

Preferably, in step (2), the quality of the tetraethyl silicate is 30% to 100% of the added amount of the aluminum powder pigment, and the dropping time of the tetraethyl silicate is 0.5 to 1.5h; the catalyst is Ammonia water or ethylenediamine, the mass of the catalyst is 4% to 30% of the added amount of tetraethyl silicate.

Preferably, in step (3), the quality of the phthalocyanine blue is 10% to 30% of the added amount of the silicon dioxide single-layer coated aluminum pigment; the surfactant is an anionic surfactant, cationic surfactant One of surfactants or nonionic surfactants, the quality of the surfactant is 1% to 4% of the added amount of the aluminum pigment coated with a single layer of silicon dioxide.

Preferably, in step (3), the solvent oil is No. 150 solvent oil or No. 200 solvent oil, and the quality of the solvent oil is 400% to 800% of the added amount of the silicon dioxide single-layer coated aluminum pigment.

Preferably, in step (3), the azo initiator is one of azobisisobutyronitrile, azobisisoheptanonitrile or BPO, and the quality of the azo initiator is a silicon dioxide monolayer 0.5% to 2% of the added amount of the coated aluminum pigment; the fluorine-containing monomer is trifluoroethyl methacrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, ethyl perfluorooctyl acrylate, Any one or more of dodecafluoroheptyl methacrylate, the quality of the fluorine-containing monomer is 4% to 30% of the addition of the aluminum pigment coated with a single layer of silica; the crosslinking agent is trihydroxy One of methyl propane trimethacrylate, N-methylol acrylamide, and diacetone acrylamide, and the quality of the crosslinking agent is 4% to 30% of the added amount of the silicon dioxide single-layer coated aluminum pigment.

Preferably, in step (3), the heating temperature is 70-90° C., and the stirring time is 3-6 hours.

The second aspect of the present invention provides a pigment-embedded multi-layer coated blue aluminum pigment.

Beneficial effects of the present invention

(1) The pigment-embedded multi-layer coated blue aluminum pigment prepared by the present invention embeds organic pigments between fluorine-silicon double layers, and the pigments are wrapped or embedded in fluoropolymer films and covered in the carbon dioxide The surface of the silicon film is simple in process, good in coating effect and bright in color.

(2) The pigment-embedded multilayer coated blue aluminum pigment prepared by the present invention embeds the phthalocyanine blue pigment between the fluorine-silicon double layers, and the fluorine-containing polymer film protects the phthalocyanine blue pigment well. effect.

(3) The pigment-embedded multilayer-coated blue aluminum pigment prepared by the present invention has strong stability in high-concentration acid-base solutions.

Description of drawings

Figure 1 is the EDS diagram of aluminum powder raw material.

Fig. 2 is an EDS elemental analysis diagram of the pigment-embedded multi-layer coated blue aluminum pigment of the present invention.

Fig. 3 is the SEM picture of aluminum powder raw material.

Fig. 4 is an SEM image of the pigment-embedded multi-layer coated blue aluminum pigment of the present invention.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

As mentioned in the background art, colored aluminum pigments are widely used, but there are problems of poor acid and alkali resistance, poor compatibility with paint substrates, and poor color tone. Based on this, the present invention provides a preparation method of a pigment-embedded multi-layer coated blue aluminum pigment, which utilizes the good binding ability of the phthalocyanine blue pigment and the fluorine-silicon double layer to embed the phthalocyanine blue pigment into the fluorine-silicon double layer Between the layers, the aluminum pigment exhibits good blue luster, good compatibility with the paint matrix, good color tone and high gloss, and good acid and alkali resistance and weather resistance. The pigment-embedded multilayer-coated blue aluminum pigment prepared by this method is scanned by energy spectrum. From Figure 1 and Figure 2, it can be found that the EDS elemental analysis diagram of the pigment-embedded multilayer-coated blue aluminum pigment There are more elements such as copper, silicon, fluorine, compared with Figure 3, the surface of the aluminum pigment of the present invention in Figure 4 is coated with a polymer, thus indicating that the pigment is wrapped or embedded in the fluoropolymer film and covered in the surface of the silica film.

Example 1

(1) Weigh 50g of raw aluminum powder into a round bottom flask, add 150g of absolute ethanol, under the protection of nitrogen, stir and heat to 70°C, react for 4h, after the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 15g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of Span 60 in a round bottom flask, add 90g of No. 150 solvent oil, stir mechanically, heat to 85°C in a water bath, use Add dropwise 0.25g of azobisisobutyronitrile dissolved in 20ml No. 150 solvent oil into the round bottom flask through the constant pressure dropping funnel, then add dropwise 1.8g of hexafluorobutyl methacrylate and 2.8 g of 20ml No. 150 solvent oil dissolved in the round bottom flask g of trimethylolpropane trimethacrylate, reacted for 4 hours, and suction filtered after the reaction to obtain a pigment-embedded multilayer-coated blue aluminum pigment.

Example 2

(1) Weigh 50g of raw aluminum powder into a round bottom flask, add 150g of absolute ethanol, stir and heat to 70°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 20g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 3.5g of phthalocyanine blue and 1g of Span 80 in a round bottom flask, add 90g of No. 150 solvent oil, stir mechanically, heat to 85°C in a water bath, use Add 0.25g of azobisisobutyronitrile dissolved in 20ml No. 150 solvent oil to the round-bottomed flask dropwise through the constant pressure dropping funnel, then add 1.8g of hexafluorobutyl methacrylate and 2.2 g of trimethylolpropane trimethacrylate was reacted for 4 hours, and suction filtered after the reaction was completed to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 3

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 70°C under nitrogen protection, and react for 5h. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 25g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silica, 3.5g of phthalocyanine blue and 0.5g of CTAB in a round bottom flask, add 90g of No. 150 solvent oil, stir mechanically, heat in a water bath to 85°C, and use constant pressure Add dropwise 0.25g of azobisisobutyronitrile dissolved in 20ml No. 150 solvent oil into the round bottom flask through the dropping funnel, then add 2.2g of hexafluorobutyl methacrylate and 1.8g of methacrylate dissolved in 20ml of No. 150 solvent oil at the same time Trimethylolpropane trimethacrylate was reacted for 4 hours, and suction filtered after the reaction was completed to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 4

(1) Weigh 50g of raw aluminum powder into a round bottom flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 4 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 25g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of SDS in a round bottom flask, add 90g of No. 150 solvent oil, stir mechanically, heat to 85°C in a water bath, and use constant pressure to drop Add dropwise 0.25g of azobisisobutyronitrile dissolved in 20ml of No. 150 solvent oil into the round bottom flask with liquid funnel, and then add dropwise 1.8g of hexafluorobutyl methacrylate and 2.4g of trihydroxybutyrate in 20ml of No. 150 solvent oil respectively Methylpropane trimethacrylate was reacted for 4 hours, and suction filtered after the reaction was completed to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 5

(1) Weigh 50g of raw aluminum powder into a round bottom flask, add 150g of absolute ethanol, stir and heat to 65°C under nitrogen protection, and react for 4 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 15g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 3.5g of phthalocyanine blue and 0.5g of Span 60 in a round bottom flask, add 90g of No. 150 solvent oil, stir mechanically, and heat to 85°C in a water bath. Use the constant pressure dropping funnel to drop 0.25g azobisisobutyronitrile dissolved in 20ml No. 150 solvent oil into the round bottom flask, then add 20ml No. 150 dissolved 1.6g hexafluorobutyl methacrylate and 2.8 g of trimethylolpropane trimethacrylate, reacted for 4 hours, and suction filtered after the reaction to obtain a pigment-embedded multilayer-coated blue aluminum pigment.

Example 6

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 70°C, slowly add 25g of tetraethyl silicate and 3ml of ethylenediamine dropwise, and react 4.5 Hours, after the reaction is completed, it is suction filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of PVP in a round bottom flask, add 90g of No. 200 solvent oil, stir mechanically, heat to 85°C in a water bath, and use constant pressure to drop Add dropwise 0.25g of azobisisobutyronitrile dissolved in 20ml No. 200 solvent oil into the round-bottomed flask through a liquid funnel, and then add 1.6g of trifluoroethyl methacrylate and 2.4g of trihydroxyethyl methacrylate dissolved in 20ml of No. 200 solvent oil dropwise at the same time. Methylpropane trimethacrylate was reacted for 4 hours, and suction filtered after the reaction was completed to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 7

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder and add it to a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat it in a water bath to 60°C, slowly add 25g of tetraethyl silicate and 3ml of ammonia water dropwise, and react for 4 hours. After the reaction is completed, it is suction-filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of Span 60 in a round bottom flask, add 90g of No. 200 solvent oil, stir mechanically, heat to 70°C in a water bath, use Add dropwise 0.25g of azobisisobutyronitrile dissolved in 20ml No. 200 solvent oil into the round-bottomed flask with a constant pressure dropping funnel, then add 1.6g of hexafluorobutyl acrylate and 2.4g of N - Methylolacrylamide, reacted for 5 hours, and suction filtered after the reaction to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 8

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder and add it to a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat it in a water bath to 70°C, slowly add 25g of tetraethyl silicate and 3ml of ammonia water dropwise, and react for 5 hours. After the reaction is completed, it is suction-filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silica, 4g of phthalocyanine blue and 0.5g of CTAB in a round bottom flask, add 90g of No. 200 solvent oil, stir mechanically, heat to 90°C in a water bath, and use constant pressure to drop Add dropwise 0.25gBPO dissolved in 20ml No. 200 solvent oil into the round-bottomed flask with liquid funnel, and then add dropwise 1.6g ethyl perfluorooctyl acrylate and 2.4g diacetone acrylamide dissolved in 20ml No. 200 solvent oil at the same time, reaction 5 Hours, after the reaction is finished, filter with suction to obtain a pigment-embedded multilayer-coated blue aluminum pigment.

Example 9

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder and put it into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat it in a water bath to 80°C, slowly add 25g of tetraethyl silicate and 3ml of ammonia water dropwise, and react for 3 hours. After the reaction is completed, it is suction-filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of Span 60 in a round bottom flask, add 90g of No. 200 solvent oil, stir mechanically, heat to 80°C in a water bath, use Add dropwise 0.25g of azobisisoheptanonitrile dissolved in 20ml No. 200 solvent oil into the round bottom flask through the constant pressure dropping funnel, and then add 1.6g of dodecafluoroheptyl methacrylate in 20ml of No. 200 solvent oil respectively at the same time React with 2.4g of N-methylolacrylamide for 6 hours, and suction filter after the reaction to obtain a pigment-embedded multi-layer coated blue aluminum pigment.

Example 10

(1) Weigh 50g of raw aluminum powder into a round-bottomed flask, add 150g of absolute ethanol, stir and heat to 80°C under nitrogen protection, and react for 3 hours. After the reaction is completed, suction filter for later use.

(2) Weigh 30g of cleaned aluminum powder into a round bottom flask, add 150ml of absolute ethanol and 80ml of water, heat the water bath to 80°C, slowly add 25g of tetraethyl silicate and 3ml of ammonia water dropwise, and react for 5 hours. After the reaction is completed, it is suction-filtered for use, that is, the aluminum pigment coated with a single layer of silicon dioxide.

(3) Weigh 25g of aluminum pigment coated with a single layer of silicon dioxide, 4g of phthalocyanine blue and 0.5g of SDS in a round bottom flask, add 90g of No. 200 solvent oil, stir mechanically, heat to 70°C in a water bath, and use constant pressure to drop Add dropwise 0.25g of BPO dissolved in 20ml No. 200 solvent oil into the round bottom flask with liquid funnel, and then add dropwise 1.6g of hexafluorobutyl methacrylate and 2.4g of diacetone acrylamide dissolved in 20ml of No. 200 solvent oil at the same time, and react for 3 hours , after the reaction is finished, filter with suction to obtain a pigment-embedded multilayer-coated blue aluminum pigment.

Test example 1

Alkali resistance test: 0.5g of the aluminum pigments prepared in Example 1, Example 2 and Example 3 and 0.5g of raw aluminum powder were respectively placed in a conical flask, and then 50ml of sodium hydroxide with a mass fraction of 5% was added solution, the volume of hydrogen released was measured by the drainage method, and the results are shown in Table 1.

Test example 2

Acid resistance test: 0.5g of the aluminum pigments prepared in Examples to Examples 10 and 0.5g of raw aluminum powder were placed in conical flasks respectively, then 50ml of hydrochloric acid solution with a mass fraction of 5% was added, and the released The volume of hydrogen, the results obtained are shown in Table 1.

The acid and alkali resistance test of table 1 aluminum pigment

The results show that, compared with the raw material aluminum powder, the amount of hydrogen evolution in Examples 1 to 10 is very small or basically does not react, indicating that the blue aluminum pigment prepared by this patent has very good acid and alkali resistance.

Although the embodiments of the present invention have been described in the specification, these embodiments are only used as hints and should not limit the protection scope of the present invention. Various omissions, substitutions and changes without departing from the scope of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. a kind of preparation method of the blue aluminum pigment of pigment embedding type multi-layer coating, is characterized in that, comprises the following steps: (1) Disperse the aluminum powder in absolute ethanol, heat and stir under the protection of an inert gas to react, after the reaction is completed, cool and suction filter to obtain the aluminum powder pigment; (2) Disperse the aluminum powder pigment prepared in the step (1) into the alcohol-water mixing system and heat it, add tetraethyl silicate and catalyst dropwise at the same time, stir, after the reaction is completed, cool and suction filter to obtain silicon dioxide Layer-coated aluminum pigments; (3) Disperse the silicon dioxide single-layer coated aluminum pigment, surfactant and phthalocyanine blue pigment prepared in step (2) in solvent oil, stir and heat under the protection of an inert gas; then add azo Initiator, fluorine-containing monomer and cross-linking agent, continue to stir, after the reaction is completed, cool and suction filter to obtain a pigment-embedded multi-layer coated blue aluminum pigment. 2. The preparation method according to claim 1, characterized in that, in step (1), the stirring time is 3-6 hours, and the heating temperature is 60-80°C. 3. The preparation method according to claim 1, characterized in that, in step (1), the mass ratio of the aluminum powder to absolute ethanol added is 1:2 to 1:4, preferably, the aluminum powder is mixed with anhydrous ethanol The mass ratio of water and ethanol added is 1:3. 4. The preparation method according to claim 1, characterized in that, in step (2), the stirring time is 3 to 6 hours, and the heating temperature is 60 to 80°C; The alcohol-water mixing system is a mixture of absolute ethanol and water, and the volume ratio of absolute ethanol and water added is 1:1-3:1. 5. preparation method according to claim 1 is characterized in that, in step (2), the quality of described tetraethyl silicate is 30%～100% of aluminum powder pigment add-on, the tetraethyl silicate The dropping time is 0.5-1.5 h; the catalyst is ammonia water or ethylenediamine, and the mass of the catalyst is 4%-30% of the added amount of tetraethyl silicate. 6. preparation method according to claim 1 is characterized in that, in step (3), the quality of described phthalocyanine blue is 10%～30% of silicon dioxide monolayer coated aluminum pigment add-on; The surfactant is one of anionic surfactant, cationic surfactant or nonionic surfactant, and the quality of the surfactant is 1% to 4% of the amount of aluminum pigment coated with a single layer of silica . 7. preparation method according to claim 1 is characterized in that, in step (3), described solvent oil is No. 150 solvent oil or No. 200 solvent oil, and the quality of solvent oil is silicon dioxide monolayer coating 400% to 800% of the amount of aluminum pigment added. 8. preparation method according to claim 1, is characterized in that, in step (3), described azo initiator is the one in azobisisobutyronitrile, azobisisoheptanonitrile or BPO, The quality of the azo initiator is 0.5% to 2% of the added amount of the silicon dioxide single-layer coated aluminum pigment; the fluorine-containing monomer is trifluoroethyl methacrylate, hexafluorobutyl methacrylate, acrylic acid Any one or more of hexafluorobutyl, ethyl perfluorooctyl acrylate, and dodecafluoroheptyl methacrylate, the mass of fluorine-containing monomer is 4% of the added amount of silica single-layer coated aluminum pigment % to 30%; the cross-linking agent is one of trimethylolpropane trimethacrylate, N-methylol acrylamide, diacetone acrylamide, and the quality of the cross-linking agent is a silicon dioxide monolayer 4% to 30% of the added amount of coated aluminum pigments. 9. The preparation method according to claim 1, characterized in that, in step (3), the heating temperature is 70-90°C; the stirring time is 3-6 hours. 10. A pigment-embedded multilayer-coated blue aluminum pigment prepared by the preparation method according to any one of claims 1-9.