A coating composition with a high-aluminum powder orientation effect and a preparation method thereof

Abstract

The present invention provides a coating composition with a high aluminum powder orientation effect. The coating composition contains, by mass parts: 10 - 16 parts of a first structural binder dispersion; 6 - 16 parts of a second structural binder dispersion; 7 - 16 parts of an aluminum powder dispersion; 10 - 15 parts of an acrylic resin; 0.5 - 1.5 parts of a polyurethane emulsion; 4 - 10 parts of an auxiliary agent; 4 - 6 parts of a curing agent; 1 - 3 parts of a pigment; and 30 - 35 parts of a solvent. Among them, the first structural binder includes lithium magnesium silicate, and the second structural binder includes polyamide wax. The coating composition has high orientation and resistance to cyclic color change. It can also significantly improve the pearlescent arrangement of aluminum powder, achieving an excellent angle-dependent color effect. In addition, the coating composition of the present invention also has a high degree of fineness. The present invention also provides a preparation method of the above coating composition with a high aluminum powder orientation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of coating compositions for automobiles. Specifically, it relates to a coating composition with a high aluminum powder orientation effect and resistance to cyclic color change. Background Art

[0002] With the continuous growth of China's annual automobile production, the automotive coating field in China also has a huge market space. In the prior art, due to considerations of environmental protection, energy conservation, etc., compared with the 3C2B process, the automotive 3C1B painting process eliminates the intermediate coating drying and sanding steps, which can greatly reduce the painting cost and operating cost. Therefore, it is the future direction of technological development. More specifically, the more compact and environmentally friendly "waterborne 3C1B-1PH" topcoat process has been developed and matured.

[0003] In the waterborne 3C1B 1PH process, the intermediate coating is wet-sprayed with color paint. However, the aluminum powder pearlescent pigment in the color paint is likely to get trapped in the intermediate coating, resulting in poor arrangement of the aluminum powder pearlescence. Moreover, a mixed layer is likely to appear at the interface between the intermediate coating and the color paint, further affecting the arrangement of the aluminum powder pearlescence.

[0004] On the other hand, in the prior art, polyamide wax or inorganic platelet silicate (Laponite RD) is mainly used alone to improve the thixotropy of the system, thereby improving the aluminum powder orientation. However, it is difficult to achieve a high L value (15° L value ≥ 140) by using polyamide wax alone to improve the aluminum powder orientation. If RD is used alone, the solids content during construction will be low, so the 3C1B 1PH waterborne system is prone to mixed layer or sagging.

[0005] In addition, in the prior art, high-L-value pure aluminum powder coatings (15° L value ≥ 140) are prone to cyclic color change when the update rate is slow, and the small-angle L value decreases significantly, and their resistance to cyclic color change is poor.

[0006] Therefore, in order to overcome the deficiencies in the prior art, it is necessary to provide a coating composition suitable for the 3C1B 1PH process that not only has a high aluminum powder orientation effect but also has resistance to cyclic color change. Summary of the Invention

[0007] The purpose of the present invention is to provide a coating composition with a high aluminum powder orientation effect. The coating composition not only has a high aluminum powder orientation effect but also has resistance to cyclic color change, a high angle-dependent color effect, and a high degree of fineness.

[0008] Another purpose of the present invention is to provide a preparation method of the above coating composition with a high aluminum powder orientation effect.

[0009] According to the first aspect of the present invention, there is provided a coating composition with a high-aluminum powder orientation effect. The coating composition comprises, by mass parts:

[0010] 10 - 16 parts of a first structural viscosity agent dispersion;

[0011] 6 - 16 parts of a second structural viscosity agent dispersion;

[0012] 7 - 16 parts of an aluminum powder dispersion;

[0013] 10 - 15 parts of an acrylic resin;

[0014] 0.5 - 1.5 parts of a polyurethane emulsion;

[0015] 4 - 10 parts of an auxiliary agent;

[0016] 4 - 6 parts of a curing agent;

[0017] 1 - 3 parts of a pigment;

[0018] 30 - 35 parts of a solvent;

[0019] Wherein the first structural viscosity agent comprises lithium magnesium silicate, and the second structural viscosity agent comprises polyamide wax.

[0020] According to the present invention, the above-mentioned first structural viscosity agent is dispersed in a solvent (water), forms a hydrate with the solvent (water), and forms hydrogen bonds between lithium magnesium silicate or with polymers, thereby increasing the structural viscosity of the system.

[0021] And the above-mentioned second structural viscosity agent is dispersed into fine particles in the solvent (water), and hydrogen bonds are formed between the particles or between the particles and the polymers, further increasing the structural viscosity of the system.

[0022] Furthermore, the first structural viscosity agent dispersion, by mass parts, comprises 0.1 - 0.3 parts of a first structural viscosity agent, 0.1 - 0.2 parts of a polyol, and 10 - 15 parts of a solvent.

[0023] Preferably, the first structural viscosity agent is selected from at least one or several of LAPONITE RD provided by BYK, HECTGEL RD provided by Huate, Hatorite RD provided by Hemingstone, Optigel CG provided by BYK, Optigel CK provided by BYK, and Optigel WX provided by BYK.

[0024] Preferably, the polyol is selected from at least one or several of PPG 1000, PPG 2000, PX - 1000, and GP - 1000.

[0025] Preferably, the solvent is pure water.

[0026] Furthermore, the second structural adhesive dispersion, by mass, comprises 0.3 - 0.5 parts of a second structural adhesive, 0.1 - 0.15 parts of an amine, 0.15 - 0.25 parts of an alcohol, and 5 - 15 parts of a solvent.

[0027] Preferably, the second structural adhesive is selected from at least one or several of AQ - 580, AQ - 870, AQ - 630, AQ - 633, AQH - 800 provided by DIC Corporation.

[0028] Preferably, the amine is selected from at least one or several of DMEA, AMP - 95, TEA, DIPA.

[0029] Preferably, the alcohol is selected from at least one or several of isopropanol, isooctanol, n - butanol, isomeric tridecanol (Exxal 13).

[0030] Preferably, the solvent is pure water.

[0031] Furthermore, the aluminum powder dispersion, by mass, comprises 3 - 6 parts of aluminum powder, 3 - 5 parts of an ether, 1 - 3 parts of an alcohol, and 1 - 3 parts of a coated resin dispersion.

[0032] Preferably, the aluminum powder is selected from at least one or several of ALUMINIUM PASTE 97 - 0510 provided by Bayer AG, EMR - D5660, EMR - FR22, Z460, 4660NS, 6270N, 6360NS provided by Toyo Aluminium K.K., ALUMINIUMPASTE 06 - 0672N, 6390NS, 6270N provided by Bayer AG.

[0033] Preferably, the ether is selected from at least one or several of diethylene glycol butyl ether, dipropylene glycol methyl ether, isooctyl ether, dipropylene glycol butyl ether, propylene glycol n - propyl ether.

[0034] Furthermore, the coated resin dispersion, by mass, comprises 1 - 2 parts of a coated resin, 0.1 - 0.5 parts of an ether, and 0.05 - 0.1 parts of an amine.

[0035] Preferably, the coated resin is selected from at least one or several of Lubrizol 2026, ACS - 1212, ACS - 1216 provided by Lubrizol Corporation.

[0036] Furthermore, the acrylic resin, by mass, comprises 2.5 - 3.5 parts of a water - soluble acrylic resin and 7 - 10 parts of an acrylic emulsion resin.

[0037] Preferably, the water - soluble acrylic resin is selected from NeoCryl provided by DSM TMAt least one or more of XK-86, ACW-1011 and ACW-1033 provided by Noroo Company.

[0038] Preferably, the acrylic emulsion is selected from those provided by DSM At least one or more of XK-205, Setalux 6803 provided by Nuplex, EMA-1036, EMA-1032, EMA-1015, EMA-1026 provided by Nippon Paint Co., Ltd.

[0039] Preferably, the polyurethane emulsion is selected from at least one or more of DAOTAN VTW 6462, DAOTAN VTW6463, DAOTAN TW 6464, UCOAT N-800 provided by Axalta.

[0040] Furthermore, the pigment is selected from extender pigments.

[0041] Preferably, the extender pigment is selected from at least one or more of barium sulfate, talc powder, kaolin, lithopone.

[0042] Furthermore, the additives include at least one or more of 0.5 - 1.5 parts of cosolvent, 1 - 2 parts of defoamer, 0.1 - 0.2 parts of gas inhibitor, 0.3 - 0.5 parts of surface conditioner, 0.15 - 0.3 parts of ultraviolet absorber, 0.4 - 0.8 parts of curing accelerator, 1 - 4 parts of de-aromatic solvent oil, 0.1 - 0.3 parts of pH regulator.

[0043] Preferably, the cosolvent is selected from polyols. More preferably, the polyol is selected from at least one or more of PPG1000, PPG 2000, PX-1000, GP-1000 as described above.

[0044] Preferably, the defoamer is selected from at least one or more of BYK-011, BYK-031, BYK-028 provided by BYK, SURFYNOL 440, SURFYNOL 104E, SURFYNOL DF-110L provided by Evonik.

[0045] Preferably, the gas inhibitor is selected from at least one or more of dioctyl phosphate, monolauryl phosphate, dilauryl phosphate, ditetradecyl phosphate, dipalmitoyl phosphate.

[0046] Preferably, the surface conditioner is selected from at least one or more of BYK-345, BYK-347, BYKETOL-WS provided by BYK, TEGO 260, TEGO 280 provided by Degussa.

[0047] Preferably, the ultraviolet absorber is selected from at least one or several of Tinuvin 384-2, Tinuvin 1130 provided by BASF, RIASORB UV-1130, EVERSORB 80 provided by Rianlon Corporation.

[0048] Preferably, the curing accelerator is selected from at least one or several of NACURE 5528, NACURE 2500, NACURE 5076, NACURE 2547 provided by King Chemical Co., Ltd.

[0049] Preferably, the dearomatized solvent naphtha is selected from aliphatic hydrocarbons. More preferably, the aliphatic hydrocarbons are selected from at least one or several of SHELLSOL D25, SHELLSOL D60, SHELLSOL 70, SHELLSOL TK provided by Shell.

[0050] Preferably, the pH regulator is selected from amines. More preferably, the amines are selected from at least one or several of the above-mentioned DMEA, AMP-95, TEA, DIPA.

[0051] Furthermore, the curing agent is selected from amino resins. Preferably, the amino resins are selected from at least one or several of CYMEL 325, CYMEL 370, CYMEL 250, CYMEL 327, MS-152IB-70 provided by Cytec.

[0052] Furthermore, the solvent is pure water. More preferably, the solvent is deionized water.

[0053] According to the second aspect of the present invention, there is provided a method for preparing the coating composition with the above-mentioned high-aluminum powder orientation effect, which comprises the following steps:

[0054] (1) Prepare the first structural adhesive dispersion;

[0055] (2) Prepare the second structural adhesive dispersion;

[0056] (3) Prepare the encapsulating resin dispersion;

[0057] (4) Prepare the aluminum powder dispersion;

[0058] (5) Under stirring, add acrylic resin, polyurethane emulsion and co-solvent to the second structural adhesive dispersion;

[0059] (6) Under stirring, add part of the additives and the curing agent to the mixture obtained in step (5);

[0060] (7) While stirring, add the aluminum powder dispersion to the mixture obtained in step (6), and confirm the fineness;

[0061] (8) While stirring, add part of the additives and pigments to the mixture obtained in step (7);

[0062] (9) While stirring, add the first structural tackifier dispersion and the pH regulator to the mixture obtained in step (8), and adjust the pH value to 8.3 - 8.5;

[0063] (10) Use a solvent to adjust the viscosity to 300 - 500 mPa·s, and thus obtain the coating composition.

[0064] Further, the preparation steps of the first structural tackifier dispersion include:

[0065] a. Under stirring conditions, slowly add the first structural tackifier to pure water through a 40 - 100 mesh sieve, and stir for 1 - 3 h;

[0066] b. Let it stand for at least 8 h, then slowly add polyol under the condition that the stirring rate is 300 - 500 rpm, stir for 15 - 30 min, and let it stand for at least 8 h again to obtain the first structural tackifier dispersion.

[0067] Further, the preparation steps of the second structural tackifier dispersion include:

[0068] a. Under the condition that the stirring rate is 100 - 300 rpm, add amine, alcohol, and the second structural tackifier to pure water in sequence;

[0069] b. Under the condition that the stirring rate is 300 - 700 rpm, stir for 1 - 3 h;

[0070] c. After measuring that the fineness ≤ 5 μm, stir for another 30 - 60 min to obtain the second structural tackifier dispersion.

[0071] Further, the preparation steps of the encapsulating resin dispersion include:

[0072] Under the condition that the stirring rate is 200 - 400 rpm, add the encapsulating resin to the ether, stir for 5 - 10 min, then add amine, and continue to stir for 5 - 10 min to obtain the encapsulating resin dispersion. After the preparation of the encapsulating resin dispersion is completed, set it aside for use in the preparation of the following aluminum powder dispersion.

[0073] Further, the preparation steps of the aluminum powder dispersion include:

[0074] a. Under the condition that the stirring rate is 200 - 400 rpm, add alcohol and aluminum powder to the ether in sequence, and stir for 5 - 10 min;

[0075] b. Scrape up the aluminum powder and stir for 10 - 20 min to confirm that there is no caking of the aluminum powder.

[0076] c. Continue stirring for 15 - 30 min under the condition that the stirring rate is 200 - 400 rpm.

[0077] d. Add the wrapped resin dispersion liquid under the stirring condition, and then stir for 15 - 30 min.

[0078] e. Measure the fineness of the obtained mixture, and the fineness needs to be ≤ 15 μm.

[0079] f. Place it at room temperature for at least 4 h to obtain the aluminum powder dispersion liquid.

[0080] Unless otherwise defined, 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 invention belongs.

[0081] The main advantages of the present invention are as follows:

[0082] The coating composition of the present invention synergistically uses a first structural viscosifier including lithium magnesium silicate and a second structural viscosifier including polyamide wax, and adopts a special dispersion process for the first structural viscosifier, so that the 15° L value of the coating composition is stably maintained at 140 or above, that is, the coating composition has high orientation.

[0083] Meanwhile, the coating composition of the present invention also adopts a special wrapping treatment process for the aluminum powder dispersion liquid, so that the change of the 15° L value is less than 3 under the condition of 3200 cycles (simulating 20 - 30 days of on-site cycles). Accordingly, the coating composition has resistance to cyclic color change.

[0084] The coating composition described in the present invention can also significantly improve the pearlescent arrangement of aluminum powder, achieving an excellent color - change - with - angle effect.

[0085] In addition, the coating composition described in the present invention also has a high degree of fineness. Detailed Embodiments

[0086] The following further elaborates the present invention in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers. Unless otherwise stated, percentages and parts are weight percentages and weight parts. The experimental materials and reagents used in the following embodiments can be obtained from commercial channels without special instructions.

[0087] Preparation of Example 1 First Structural Adhesive Dispersion (No. 1)

[0088] Under the condition of a stirring rate of 100 - 300 rpm, slowly add 0.3 parts of Hatorite RD through a 40 - 100 mesh sieve into 11.52 parts of pure water, then continue stirring for 1 - 3 h under the condition of a stirring rate of 300 - 500 rpm, apply it by pouring on a transparent polyester sheet, confirm no spots, and then let it stand for at least 8 h. Then, under the condition of a stirring rate of 300 - 500 rpm, slowly add 0.18 parts of PPG 1000, continue stirring for 15 - 30 min, let it stand again for at least 8 h, take a sample and apply it by pouring on a transparent polyester sheet, confirm no spots, and thus obtain 12 parts of the first structural adhesive dispersion (No. 1).

[0089] Preparation of Example 2 First Structural Adhesive Dispersion (No. 2)

[0090] Under the condition of a stirring rate of 100 - 300 rpm, slowly add 0.3 parts of Hatorite RD through a 40 - 100 mesh sieve into 11.7 parts of pure water, then continue stirring for 1 h under the condition of a stirring rate of 300 - 500 rpm, visually judge the dispersion liquid, and the mixture is in a clear and transparent state, and thus obtain 12 parts of the first structural adhesive dispersion (No. 2).

[0091] It should be noted that since the components of the first structural adhesive dispersion (No. 2) do not include the polyol component described in the present invention, nor adopt the dispersion process described in Example 1, the first structural adhesive dispersion (No. 2) is only used as a comparative example.

[0092] Preparation of Example 3 Second Structural Adhesive Dispersion (No. 1)

[0093] Under the condition of a stirring rate of 100 - 300 rpm, add 0.1 part of DMEA, 0.9 part of isooctanol and 0.5 part of AQ - 633 into 13.5 parts of pure water, then stir for 1 - 3 h under the condition of a stirring rate of 300 - 700 rpm, after confirming that the fineness ≤ 5 μm, stir for another 30 - 60 min, and thus obtain 15 parts of the second structural adhesive dispersion (No. 1).

[0094] Preparation of Example 4 Second Structural Adhesive Dispersion (No. 2)

[0095] Under the condition of a stirring rate of 100 - 300 rpm, add 0.1 part of DMEA, 0.9 part of isooctanol and 0.5 part of AQ - 630 into 13.5 parts of pure water, then stir for 1 - 3 h under the condition of a stirring rate of 300 - 700 rpm, after confirming that the fineness ≤ 5 μm, stir for another 30 - 60 min, and thus obtain 15 parts of the second structural adhesive dispersion (No. 2).

[0096] Preparation of Example 5 Aluminum Powder Dispersion (No. 1)

[0097] First, prepare the encapsulated resin dispersion through the following steps: Under the condition of a stirring rate of 200 - 400 rpm, add 1.2 parts of Lubrizol 2026 to 0.25 parts of isooctyl ether, stir for another 5 - 10 min, then add 0.05 parts of DMEA, and stir for 5 - 10 min to obtain 1.5 parts of the encapsulated resin dispersion.

[0098] Under the condition of a stirring rate of 200 - 400 rpm, add 1 part of isooctyl alcohol, 3.4 parts of 6270N aluminum powder, and 1.6 parts of 4660NS aluminum powder to 3 parts of isooctyl ether, continue to stir for 5 - 10 min, then scrape the aluminum powder on the cylinder wall and bottom with a scraper, stir for 10 - 20 min, confirm that there is no agglomeration of aluminum powder, continue to stir for 15 - 30 min under the condition of a stirring rate of 200 - 400 rpm, then add 1.5 parts of the above-mentioned encapsulated resin dispersion under stirring conditions, continue to stir for 15 - 30 min, confirm that the fineness is ≤ 15 μm, and then let it stand at room temperature for at least 4 h to obtain 10.5 parts of aluminum powder dispersion (No. 1).

[0099] Preparation of Example 6 Aluminum Powder Dispersion (No. 2)

[0100] Under the condition of a stirring rate of 200 - 400 rpm, add 1 part of isooctyl alcohol, 3.4 parts of 6270N aluminum powder, and 1.6 parts of 4660NS aluminum powder to 3 parts of isooctyl ether, continue to stir for 5 - 10 min, then scrape the aluminum powder on the cylinder wall and bottom with a scraper, stir for 10 - 20 min, confirm that there is no agglomeration of aluminum powder, continue to stir for 15 - 30 min under the condition of a stirring rate of 200 - 400 rpm, then add 1.2 parts of Lubrizol 2026 under stirring conditions, continue to stir for 15 - 30 min, confirm that the fineness is ≤ 15 μm to obtain 10.2 parts of aluminum powder dispersion (No. 2).

[0101] It should be noted that since the aluminum powder dispersion (No. 2) does not include the pre-prepared encapsulated resin dispersion described in the present invention, but directly adds the encapsulated resin Lubrizol 2026 and does not adopt the aluminum powder dispersion process described in Example 5, the aluminum powder dispersion (No. 2) is only used as a comparative example.

[0102] Example 1 Coating Composition 1 with High Aluminum Powder Orientation Effect

[0103] A coating composition 1 with a high aluminum powder orientation effect, and the composition of the coating composition 1 is shown in Table 1 below:

[0104] Table 1 Coating Composition 1 with High Aluminum Powder Orientation Effect

[0105]

[0106]

[0107] The preparation process of the coating composition 1 with the above-mentioned high-aluminum powder orientation effect is as follows:

[0108] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the second structural viscous agent dispersion liquid (No. 1), and stir for 10 - 15 min. Then continue to add 3 parts of ACW-1011, 10 parts of Setalux 6803, 1.5 parts of DAOTAN TW 6464, and stir for 10 - 15 min. Continue to add 1 part of PPG1000 and stir for 10 - 15 min. Then add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min. Continue to add 7 parts of CYMEL 370 and stir for 15 - 30 min. Then add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion liquid (No. 1), then adjust the stirring rate to 300 - 500 rpm again, and stir for 10 - 15 min. Continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, 0.25 part of aliphatic hydrocarbon, and stir for 10 - 15 min. Add 12 parts of the first structural viscous agent dispersion liquid (No. 1), stir for 10 - 15 min, add amine to adjust the pH value to 8.3 - 8.5, and adjust the viscosity to 300 - 500 mpas (B-type viscometer, 3# rotor) with deionized water the next day, thus obtaining 98.75 parts of the coating composition 1 with the high-aluminum powder orientation effect.

[0109] Example 2 Coating Composition 2 with High Aluminum Powder Orientation Effect

[0110] A coating composition 2 with a high-aluminum powder orientation effect, and the composition of the coating composition 2 is shown in Table 2 below:

[0111] Table 2 Coating Composition 2 with High-Aluminum Powder Orientation Effect

[0112]

[0113] The preparation process of the above-mentioned coating composition 2 with the high-aluminum powder orientation effect is as follows:

[0114] Under the condition of a stirring rate of 300 - 500 rpm, add 12 parts of the second structural viscous agent dispersion (No. 2) into a container equipped with a stirrer, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464 and stir for 10 - 15 min. Then continue to add 1 part of PPG1000 and stir for 10 - 15 min, add 1.5 parts of SURFYNOL104E and stir for 15 - 30 min, add 7 parts of CYMEL 370 and stir for 15 - 30 min, add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 1), then adjust the stirring rate to 300 - 500 rpm and stir for 10 - 15 min. Continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, 0.25 part of aliphatic hydrocarbon, and stir for 10 - 15 min. Add 12 parts of the first structural viscous agent dispersion (No. 1) and stir for 10 - 15 min. Add amine to adjust the pH value to 8.3 - 8.5, and the next day, adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water to obtain 98.75 parts of the coating composition with high aluminum powder orientation effect.

[0115] Comparative Example 1 Coating Composition 3 with Aluminum Powder Orientation Effect

[0116] A coating composition 3 with an aluminum powder orientation effect, and the composition of the coating composition 3 is shown in Table 3 as follows:

[0117] Table 3 Coating Composition 3 with an Aluminum Powder Orientation Effect

[0118]

[0119]

[0120] The preparation process of the above - mentioned coating composition 3 with an aluminum powder orientation effect is as follows:

[0121] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the structural second structural viscous agent dispersion (No. 1) into a container equipped with a stirrer, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464, stir for 10 - 15 min, continue to add 1 part of PPG1000 and stir for 10 - 15 min, add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min, add 7 parts of CYMEL 370 and stir for 15 - 30 min, add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 1), then adjust the stirring rate to 300 - 500 rpm, stir for 10 - 15 min, continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, 0.25 part of aliphatic hydrocarbon, stir for 10 - 15 min, add 12 parts of the first structural viscous agent dispersion (No. 2), stir for 10 - 15 min, add amine to adjust the pH value to 8.3 - 8.5, and the next day, adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water, thus obtaining 98.75 parts of the coating composition 3 with aluminum powder orientation effect.

[0122] It should be noted that since this comparative example uses the first structural viscous agent dispersion (No. 2), which does not include the polyol component described in the present invention and does not adopt the dispersion process described in Example 1, the coating composition 3 with aluminum powder orientation effect is only used as Comparative Example 1.

[0123] Comparative Example 2 Coating Composition 4 with Aluminum Powder Orientation Effect

[0124] A coating composition 4 with aluminum powder orientation effect, and the composition of the coating composition 4 is shown in Table 4 below:

[0125] Table 4 Coating composition 4 with aluminum powder orientation effect

[0126]

[0127] The preparation process of the above - mentioned coating composition 4 with aluminum powder orientation effect is as follows:

[0128] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the structural second structural viscous agent dispersion (No. 2) into a container equipped with a stirrer, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464, and stir for 10 - 15 min. Then continue to add 1 part of PPG1000 and stir for 10 - 15 min. Add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min. Add 7 parts of CYMEL 370 and stir for 15 - 30 min. Add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 1), then adjust the stirring rate to 300 - 500 rpm again and stir for 10 - 15 min. Continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, and 0.25 part of aliphatic hydrocarbon, and stir for 10 - 15 min. Add 12 parts of the first structural viscous agent dispersion (No. 2), stir for 10 - 15 min, add amine to adjust the pH value to 8.3 - 8.5, and adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water the next day, thus obtaining 498.75 parts of the coating composition with aluminum powder orientation effect.

[0129] Similarly, it should be noted that since this comparative example uses the first structural viscous agent dispersion (No. 2), which does not include the polyol component described in the present invention and does not adopt the dispersion process described in Example 1, the coating composition 4 with aluminum powder orientation effect is only used as Comparative Example 2.

[0130] Comparative Example 3 Coating Composition 5 with Aluminum Powder Orientation Effect

[0131] A coating composition 5 with aluminum powder orientation effect, and the composition of the coating composition 5 is shown in Table 5 below:

[0132] Table 5 Coating Composition 5 with Aluminum Powder Orientation Effect

[0133]

[0134]

[0135] The preparation process of the above - mentioned coating composition 5 with aluminum powder orientation effect is as follows:

[0136] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the second structural viscous agent dispersion (No. 1) with a stirrer into a container, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464, stir for 10 - 15 min, continue to add 1 part of PPG1000 and stir for 10 - 15 min, add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min, add 7 parts of CYMEL 370 and stir for 15 - 30 min, add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 2), then adjust the stirring rate to 300 - 500 rpm, stir for 10 - 15 min, continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, 0.25 part of aliphatic hydrocarbon, stir for 10 - 15 min, add 12 parts of the first structural viscous agent dispersion (No. 1), stir for 10 - 15 min, add amine to adjust the pH value to 8.3 - 8.5, and adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water the next day, thus obtaining 598.45 parts of the coating composition with aluminum powder orientation effect.

[0137] It should be noted that since the aluminum powder dispersion (No. 2) is used in this comparative example, which does not include the pre - prepared encapsulated resin dispersion described in the present invention and does not adopt the aluminum powder dispersion process described in Example 5, the coating composition 5 with aluminum powder orientation effect is only used as Comparative Example 3.

[0138] Comparative Example 4 Coating Composition 6 with Aluminum Powder Orientation Effect

[0139] A coating composition 6 with aluminum powder orientation effect, and the composition of the coating composition 6 is shown in Table 6 as follows:

[0140] Table 6 Coating composition 6 with aluminum powder orientation effect

[0141]

[0142] The preparation process of the above - mentioned coating composition 6 with aluminum powder orientation effect is as follows:

[0143] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the structural second structural viscous agent dispersion (No. 2) into a container equipped with a stirrer, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464, stir for 10 - 15 min, continue to add 1 part of PPG1000 and stir for 10 - 15 min, add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min, add 7 parts of CYMEL 370 and stir for 15 - 30 min, add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 2), then adjust the stirring rate to 300 - 500 rpm, stir for 10 - 15 min, continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, 0.25 part of aliphatic hydrocarbon, stir for 10 - 15 min, add 12 parts of the first structural viscous agent dispersion (No. 1), stir for 10 - 15 min, add amine to adjust the pH value to 8.3 - 8.5, and the next day, adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water to obtain 98.45 parts of the coating composition 6 with aluminum powder orientation effect.

[0144] Similarly, it should be noted that since the aluminum powder dispersion (No. 2) is used in this comparative example, which does not include the pre - prepared encapsulated resin dispersion described in the present invention and does not adopt the aluminum powder dispersion process described in Example 5, the coating composition 6 with aluminum powder orientation effect is only used as Comparative Example 4.

[0145] Comparative Example 5 Coating Composition 7 with Aluminum Powder Orientation Effect

[0146] A coating composition 7 with aluminum powder orientation effect, and the composition of the coating composition 7 is shown in Table 7 below:

[0147] Table 7 Coating composition 7 with aluminum powder orientation effect

[0148]

[0149]

[0150] The preparation process of the above - mentioned coating composition 7 with aluminum powder orientation effect is as follows:

[0151] Under the condition of a stirring rate of 300 - 500 rpm, add 15 parts of the structural second structural viscous agent dispersion (No. 1) into a container equipped with a stirrer, stir for 10 - 15 min, then continue to add 3 parts of ACW - 1011, 10 parts of Setalux 6803, and 1.5 parts of DAOTAN TW 6464 and stir for 10 - 15 min. Then continue to add 1 part of PPG1000 and stir for 10 - 15 min. Add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min. Add 7 parts of CYMEL 370 and stir for 15 - 30 min. Add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 1), then adjust the stirring rate to 300 - 500 rpm and stir for 10 - 15 min. Continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, and 0.25 part of aliphatic hydrocarbon, and stir for 10 - 15 min. Add amine to adjust the pH value to 8.3 - 8.5, and adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water the next day to obtain 785.25 parts of the coating composition with aluminum powder orientation effect.

[0152] It should be noted that this comparative example adopts the process in the prior art and only uses one kind of structural viscous agent, namely polyamide wax, which does not include the first structural viscous agent described in the present invention. Therefore, this coating composition 7 with aluminum powder orientation effect is only used as Comparative Example 5.

[0153] Comparative Example 6 Coating Composition 8 with Aluminum Powder Orientation Effect

[0154] A coating composition 8 with aluminum powder orientation effect, and the composition of this coating composition 7 is shown in Table 7 as follows:

[0155] Table 8 Coating Composition 8 with Aluminum Powder Orientation Effect

[0156]

[0157]

[0158] The preparation process of the above - mentioned coating composition 8 with aluminum powder orientation effect is as follows:

[0159] Under the condition of a stirring rate of 300 - 500 rpm, add 3 parts of ACW - 1011 into a container equipped with a stirrer. Then continue to add 10 parts of Setalux 6803 and 1.5 parts of DAOTAN TW 6464, and stir for 10 - 15 min. Next, continue to add 1 part of PPG1000 and stir for 10 - 15 min. Then add 1.5 parts of SURFYNOL 104E and stir for 15 - 30 min. After that, add 7 parts of CYMEL 370 and stir for 15 - 30 min. Add 3.5 parts of barium sulfate dispersion slurry, adjust the stirring rate to 100 - 200 rpm, slowly add 8 parts of aluminum powder dispersion (No. 1), then adjust the stirring rate to 300 - 500 rpm and stir for 10 - 15 min. Continue to add 0.1 part of gas inhibitor, 0.3 part of surface conditioner, 0.25 part of ultraviolet absorber, 0.4 part of curing agent accelerator, and 0.25 part of aliphatic hydrocarbon, and stir for 10 - 15 min. Then continue to add 12 parts of the first structural viscous agent dispersion (No. 1) and stir for 10 - 15 min. Add amine to adjust the pH value to 8.3 - 8.5. The next day, adjust the viscosity to 300 - 500 mPas (B - type viscometer, 3# rotor) with deionized water, and thus obtain 883.75 parts of the coating composition with aluminum powder orientation effect.

[0160] It should be noted that this comparative example adopts the process in the prior art and only uses one kind of structural viscous agent, namely lithium magnesium silicate, which does not include the second structural viscous agent described in the present invention. Therefore, the coating composition 8 with aluminum powder orientation effect is only used as Comparative Example 6.

[0161] The prepared coating compositions 1 - 8 are detected, and the detection items and methods are shown in the following table:

[0162] Table 9 Detection Indexes and Methods for L Value and Appearance of Coating Composition

[0163] Detection Items Detection Methods L value (15°) XRITE-65 Color Difference Meter FI value (Angle-Dependent Color Difference Index) XRITE-65 Color Difference Meter DOI Orange Peel Gauge Cyclic Color Change (Change in 15° L value) Simulated Cycle

[0164] The detection results are shown in Table 10 below:

[0165] Table 10 Performance Detection Results of Coating Compositions 1 - 8

[0166]

[0167] As shown in the above table, the coating compositions described in Example 1 and Example 2 are the coating compositions with high aluminum powder orientation effect described in the present invention.

[0168] Among them, the coating composition synergistically uses a first structural binder including lithium magnesium silicate and a second structural binder including polyamide wax, and adopts a special dispersion process for the first structural binder, so that the 15° L value of the coating composition is stably maintained at 140 or above. The coating composition has high orientation.

[0169] At the same time, the coating composition of the present invention also adopts a special encapsulation treatment process for the aluminum powder dispersion liquid, so that the change in the 15° L value is less than 3 under 3200 cycles (simulating 20 - 30 days of on-site cycles). Accordingly, the coating composition has resistance to cyclic color change.

[0170] In addition, the coating composition described in the present invention also has a high color - change - with - angle effect and a high degree of fineness.

[0171] As shown in Comparative Example 1 and Comparative Example 2 in the above table, since the dispersion process described above was not adopted for the first structural binder dispersion liquid used therein, their 15° L values are both below 140 and do not have the high orientation of the coating composition of the present invention.

[0172] As shown in Comparative Example 3 and Comparative Example 4 in the above table, since the aluminum powder dispersion liquid used therein did not adopt the dispersion process described in the present invention, the change in the 15° L value is far greater than 3 under 3200 cycles (simulating 20 - 30 days of on - site cycles), and it does not have the resistance to cyclic color change of the coating composition of the present invention.

[0173] As shown in Comparative Example 5 and Comparative Example 6 in the above table, the single - component structural binder in the prior art was used therein, so their 15° L values are both far below 140 and do not have the high orientation of the coating composition of the present invention.

[0174] Obviously, the above - mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to enumerate all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A coating composition with a directional effect of high-aluminum powder, the coating composition comprising by mass parts: 10 - 16 parts of a first structural adhesive dispersion; 6 - 16 parts of a second structural adhesive dispersion; 7 - 16 parts of an aluminum powder dispersion; 10 - 15 parts of an acrylic resin; 0.5 - 1.5 parts of a polyurethane emulsion; 4 - 10 parts of an auxiliary agent; 4 - 6 parts of a curing agent; 1 - 3 parts of a pigment; 30 - 35 parts of a solvent; Among them, The first structural adhesive includes lithium magnesium silicate, and the second structural adhesive includes polyamide wax; Among them, the first structural adhesive dispersion, by mass parts, includes: 0.1 - 0.3 parts of a first structural adhesive, 0.1 - 0.2 parts of a polyol, and 10 - 15 parts of a solvent; Among them, the second structural adhesive dispersion, by mass parts, includes: 0.3 - 0.5 parts of a second structural adhesive, 0.1 - 0.15 parts of an amine, 0.15 - 0.25 parts of an alcohol, and 5 - 15 parts of a solvent; Among them, the aluminum powder dispersion, by mass parts, includes: 3 - 6 parts of aluminum powder, 3 - 5 parts of an ether, 1 - 3 parts of an alcohol, and 1 - 3 parts of a coating resin dispersion.

2. The coating composition according to claim 1, wherein the coating resin dispersion, by mass parts, includes: 1 - 2 parts of a coating resin, 0.1 - 0.5 parts of an ether, and 0.05 - 0.1 parts of an amine.

3. The coating composition according to claim 2, wherein the auxiliary agent includes at least one or several of 0.5 - 1.5 parts of a cosolvent, 1 - 2 parts of an antifoaming agent, 0.1 - 0.2 parts of a gas inhibitor, 0.3 - 0.5 parts of a surface conditioner, 0.15 - 0.3 parts of an ultraviolet absorber, 0.4 - 0.8 parts of a curing accelerator, 1 - 4 parts of a de-aromatic solvent oil, and 0.1 - 0.3 parts of a pH regulator.

4. A preparation method of a coating composition according to any one of claims 1 - 3, comprising the following steps: (1) Prepare a first structural adhesive dispersion; (2) Prepare a second structural adhesive dispersion; (3) Prepare a coating resin dispersion; (4) Prepare an aluminum powder dispersion; (5) Under stirring, add the acrylic resin, the polyurethane emulsion, and the cosolvent to the second structural adhesive dispersion; (6) Under stirring, add part of the auxiliary agent and the curing agent to the mixture obtained in step (5); (7) Under stirring, add the aluminum powder dispersion to the mixture obtained in step (6), and confirm the fineness; (8) Under stirring, add part of the auxiliary agent and the pigment to the mixture obtained in step (7); (9) Under stirring, add the first structural adhesive dispersion and the pH regulator to the mixture obtained in step (8), and adjust the pH value; (10) Adjust the viscosity with a solvent to obtain the coating composition.

5. The preparation method according to claim 4, wherein the preparation steps of the first structural adhesive dispersion include: a. Under stirring conditions, slowly add the first structural adhesive through a 40 - 100 mesh sieve to pure water, and stir for 1 - 3 h; b. Let it stand for at least 8 h, then slowly add polyol under the condition that the stirring rate is 300 - 500 rpm, stir for another 15 - 30 min, and let it stand again for at least 8 h to obtain the first structural adhesive dispersion.

6. The preparation method according to claim 4, wherein the preparation steps of the encapsulated resin dispersion include: Under the condition that the stirring rate is 200 - 400 rpm, add the encapsulated resin to the ether, stir for 5 - 10 min, add amine, and stir for another 5 - 10 min to obtain the encapsulated resin dispersion.

7. The preparation method according to claim 6, wherein the preparation steps of the aluminum powder dispersion include: a. Under the condition that the stirring rate is 200 - 400 rpm, add alcohol and aluminum powder to the ether in sequence and stir for 5 - 10 min; b. Scrape up the aluminum powder, stir for another 10 - 20 min, and confirm that there is no agglomeration of aluminum powder; c. Under the condition that the stirring rate is 200 - 400 rpm, continue to stir for 15 - 30 min; d. Add the encapsulated resin dispersion under stirring, and stir for another 15 - 30 min; e. Measure the fineness of the obtained mixture, and the fineness needs to be ≤ 15 μm; f. Let it stand at room temperature for at least 4 h to obtain the aluminum powder dispersion.

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