Laser alumite color layer coating and preparation method thereof

Abstract

The invention discloses a laser alumite color layer coating and a preparation method thereof, and the color layer coating comprises the following raw materials: polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, nitrocotton, high-functionality acrylic ester, 2, 4, 6-trimethyl-1, 3-pentanediol monoisobutyrate, 2, 4, 6-trimethyl-1, 3-pentanediol monoisobutyrate, 2, 4, 6-trimethyl-1, 3- The coating is prepared from the following raw materials: 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide, reinforced sol, hexamethylene diisocyanate tripolymer, hydroxypropyl acrylate and a solvent. The laser alumite color layer coating disclosed by the invention is environment-friendly, good in adhesion fastness, high in curing speed, high in glossiness, good in flexibility, outstanding in laser holographic effect and wide in mold pressing temperature range, and the problems of plate sticking and plate blocking of the coating on a nickel plate are completely eradicated; the coating is simple in preparation method and convenient for industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of hot stamping foil coatings, and particularly to a laser hot stamping foil color layer coating and a preparation method thereof. Background Art

[0002] Laser anti-counterfeiting technology uses a laser light source to record both the light wave amplitude information and corresponding information within an extremely short time, and uses the interference principle of light to reflect each particle constituting the image, thus making a unique anti-counterfeiting plate to achieve the purpose of anti-counterfeiting.

[0003] Among them, the laser hot stamping foil film is a new technological product developed since the 1990s along with the world's environmental protection requirements. It not only has many functions such as decoration and anti-counterfeiting, but also has low cost and is durable, and has gradually been widely recognized and applied in the packaging industry, such as being used for cosmetic packaging, cigarette packaging, wine packaging, gift box packaging, etc. The laser hot stamping foil film generally includes a substrate layer, a coating layer and an aluminized layer in contact with each other. The coating layer is prepared by coating a laser hot stamping foil release layer coating, a color layer coating, a protective layer coating and an adhesive layer. Among them, the color layer coating is the key layer for achieving the laser anti-counterfeiting effect.

[0004] At present, the laser hot stamping foil color layer coatings on the market generally include acrylate copolymers, cellulose compounds with the same softening point as the acrylate copolymers, and ketone organic solvents. During the production and coating processes, ketone substances such as methyl ethyl ketone and acetone contained in the solvent have strong pungent odors and toxicity, which will pose potential health threats to producers. At the same time, the residual volatile organic substances VOCs will also pose potential physical hazards to consumers. Therefore, it is necessary to develop a new type of laser hot stamping foil color layer coating without ketone solvents. Summary of the Invention

[0005] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the present invention is to provide a laser hot stamping foil color layer coating, which is environmentally friendly, has good adhesion fastness, fast curing speed, high gloss, good flexibility, has an outstanding anti-counterfeiting effect, has a wide hot stamping temperature range, and eliminates the problems of sticking and plugging of the coating to the nickel plate.

[0006] Another purpose of the present invention is to provide a preparation method of a laser hot stamping foil color layer coating, which is simple and efficient, convenient for operation control, has high product quality, low cost, and is convenient for industrial production.

[0007] The object of the present invention is achieved by the following technical solutions: A laser aluminized color layer coating, comprising the following raw materials in parts by weight: 10-15 parts of polyurethane resin, 20-30 parts of hydroxyl-containing acrylate resin, 1-5 parts of polyurea resin, 3-7 parts of amino resin, 4-8 parts of nitrocellulose, 1-5 parts of high-functional acrylate, 1-3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-8 parts of reinforcing sol, 3-7 parts of hexamethylene diisocyanate trimer, 1-5 parts of hydroxypropyl acrylate, and 30-60 parts of solvent.

[0008] Preferably, the laser aluminized color layer coating comprises the following raw materials in parts by weight: 10-12 parts of polyurethane resin, 24-28 parts of hydroxyl-containing acrylate resin, 1-3 parts of polyurea resin, 3-5 parts of amino resin, 4-5 parts of nitrocellulose, 1-3 parts of high-functional acrylate, 1-3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 3-5 parts of reinforcing sol, 3-5 parts of hexamethylene diisocyanate trimer, 1-3 parts of hydroxypropyl acrylate, and 30-50 parts of solvent.

[0009] The laser aluminized color layer coating in the present invention is environmentally friendly, has good adhesion fastness, fast curing speed, high gloss, good flexibility, has an outstanding anti-counterfeiting effect, has a wide range of molding temperatures, and eliminates the problems of coating sticking to the nickel plate and plugging the plate. Among them, the hydroxyl-containing acrylate resin and polyurea resin used can undergo crosslinking curing reactions during coating drying. After the coating is crosslinked and networked, better temperature resistance and rubbing resistance can be obtained, and at the same time, the weather resistance of the coating can be improved, it is not easily corroded by acids and alkalis, and the applicability of the coating is increased; under the catalytic action, the -NCO of the hexamethylene diisocyanate trimer can react with the hydroxyl group of hydroxypropyl acrylate to obtain a crosslinked component containing six urethane groups and three terminal unsaturated carbon-carbon double bonds, and then crosslink and cure with the above various resins, further improving the weather resistance, density and wear resistance of the coating; 2,4,6-trimethylbenzoyl-diphenylphosphine oxide is used as a photoinitiator, which plays a good photo-curing role during coating curing, and further improves the film-forming performance and hardness of the coating.

[0010] Preferably, the polyurethane resin is polyester-type polyurethane, and its weight average molecular weight is 20,000-30,000; the weight average molecular weight of the hydroxyl-containing acrylate resin is 30,000-40,000.

[0011] In the present invention, the polyurethane resin and hydroxyl-containing acrylate resin with the above weight average molecular weights have good film-forming properties and excellent wear resistance.

[0012] Preferably, the high-functional acrylate is one or more of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate.

[0013] Preferably, the reinforcing sol is composed of ZrO 2 sol and SiO 2 sol in a mass ratio of 0.4 - 0.8:1.0 - 1.4.

[0014] In the present invention, the SiO 2 sol and ZrO 2 sol in the above-mentioned reinforcing sol form a large number of Si - O - Si, Zr - O - Zr and Zr - O - Si covalent bond networks in the coating, making the coating have a dense inorganic network structure, which can further improve the wear resistance of the coating.

[0015] Preferably, the solvent is one or more of ethyl acetate, n - propanol, n - butanol, propylene glycol methyl ether, n - propyl acetate, and n - butyl acetate.

[0016] The present invention also provides a preparation method of a laser aluminized chromatic layer coating, which is prepared by the following steps:

[0017] S1. By weight, add polyurethane resin, hydroxyl - containing acrylate resin, polyurea resin, amino resin, solvent and high - functionality acrylate into reaction kettle A, heat to 50 - 60 °C, and stir at a speed of 180 - 300 r / min for 1 - 3 h to obtain mixture A for standby;

[0018] S2. By weight, mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and the reinforcing sol, and then add them into reaction kettle B, heat to 40 - 50 °C, and stir at a speed of 60 - 120 r / min for 20 - 40 min to obtain mixture B for standby;

[0019] S3. By weight, add 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide and the mixture B obtained in step S2 into mixture A, heat to 40 - 50 °C, and stir thoroughly for 10 - 20 min until evenly dispersed to obtain the laser aluminized chromatic layer coating.

[0020] The beneficial effects of the present invention are as follows: The laser aluminized chromatic layer coating of the present invention is environmentally friendly, has good adhesion fastness, fast curing speed, high gloss, good flexibility, has an outstanding laser holographic effect, has a wide range of hot stamping temperature, and eliminates the problems of coating sticking to the nickel plate and plugging the plate.

[0021] The preparation method of the laser aluminized chromatic layer coating of the present invention is simple and efficient, easy to operate and control, the produced products have high quality and low cost, and are convenient for industrial production. Detailed implementation mode

[0022] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0023] Example 1

[0024] A laser electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 10 parts of polyurethane resin, 24 parts of hydroxyl-containing acrylate resin, 2 parts of polyurea resin, 3 parts of amino resin, 4 parts of nitrocellulose, 2 parts of high-functionality acrylate, 2 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4 parts of reinforcing sol, 5 parts of hexamethylene diisocyanate trimer, 3 parts of hydroxypropyl acrylate and 30 parts of solvent.

[0025] The hydroxyl-containing acrylic resin adopts L-1260 hydroxyl-containing acrylic resin provided by Guangdong Sanqi New Materials Co., Ltd., the polyurea resin adopts asparagus polyurea resin produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., and the amino resin adopts CYMEL325 amino resin produced by Allnex Resins (China) Co., Ltd.

[0026] The high-functionality acrylate is trimethylolpropane triacrylate, and the reinforcing sol is ZrO 2 Sol and SiO 2 The sol is a mixture composed of a mass ratio of 0.4:1.0, and the solvent is ethyl acetate.

[0027] The laser electrochemical aluminum color layer coating is prepared by the following steps:

[0028] S1. Add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functionality acrylate into reaction kettle A according to parts by weight, heat to 50° C., and stir at a speed of 180 r / min for 3 hours to obtain mixture A for standby use;

[0029] S2. Mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol according to weight parts, add them into reactor B, heat to 50° C., and stir at a speed of 60 r / min for 20 min to obtain mixture B for standby use;

[0030] S3. Add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and the mixture B obtained in step S2 to the mixture A according to parts by weight, heat to 40° C., and stir thoroughly for 20 minutes until the mixture is evenly dispersed to obtain a laser electrochemical aluminum color layer coating.

[0031] Example 2

[0032] A laser electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 12 parts of polyurethane resin, 25 parts of hydroxyl-containing acrylate resin, 2.5 parts of polyurea resin, 3 parts of amino resin, 4.5 parts of nitrocellulose, 2 parts of high-functionality acrylate, 2 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4 parts of reinforcing sol, 4 parts of hexamethylene diisocyanate trimer, 2 parts of hydroxypropyl acrylate and 40 parts of solvent.

[0033] The hydroxyl-containing acrylic resin adopts L-1260 hydroxyl-containing acrylic resin provided by Guangdong Sanqi New Materials Co., Ltd., the polyurea resin adopts asparagus polyurea resin produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., and the amino resin adopts CYMEL325 amino resin produced by Allnex Resins (China) Co., Ltd.

[0034] The high-functionality acrylate is pentaerythritol triacrylate, and the reinforcing sol is ZrO 2 Sol and SiO 2 The sol is composed of a mixture according to a mass ratio of 0.5:1.1, and the solvent is propylene glycol methyl ether.

[0035] The laser electrochemical aluminum color layer coating is prepared by the following steps:

[0036] S1. Add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functionality acrylate into reactor A according to weight parts, heat to 55° C., and stir at a speed of 220 r / min for 2 h to obtain mixture A for standby use;

[0037] S2. Mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol according to weight parts, add them into reactor B, heat to 45° C., and stir at a speed of 90 r / min for 30 min to obtain mixture B for standby use;

[0038] S3. Add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and the mixture B obtained in step S2 to the mixture A according to parts by weight, heat to 45° C., and stir thoroughly for 15 minutes until the mixture is evenly dispersed to obtain a laser electrochemical aluminum color layer coating.

[0039] Example 3

[0040] A laser electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 10.5 parts of polyurethane resin, 26 parts of hydroxyl-containing acrylate resin, 1.5 parts of polyurea resin, 3.5 parts of amino resin, 4 parts of nitrocellulose, 2.5 parts of high-functionality acrylate, 2.5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 3.5 parts of reinforcing sol, 3.5 parts of hexamethylene diisocyanate trimer, 1.5 parts of hydroxypropyl acrylate and 38 parts of solvent.

[0041] The hydroxyl-containing acrylic resin adopts L-1260 hydroxyl-containing acrylic resin provided by Guangdong Sanqi New Materials Co., Ltd., the polyurea resin adopts asparagus polyurea resin produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., and the amino resin adopts CYMEL325 amino resin produced by Allnex Resins (China) Co., Ltd.

[0042] The high-functionality acrylate is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate in a mass ratio of 0.5:1.0; the reinforcing sol is ZrO 2 Sol and SiO 2 The sol is a mixture composed of a mass ratio of 0.6:1.2; the solvent is a mixture composed of ethyl acetate, n-propanol and n-butyl acetate in a weight ratio of 0.8:1.0:0.7.

[0043] The laser electrochemical aluminum color layer coating is prepared by the following steps:

[0044] S1. Add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functionality acrylate to reaction kettle A according to parts by weight, heat to 60° C., and stir at a speed of 180 r / min for 2 h to obtain mixture A for standby use;

[0045] S2. Mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol according to weight, add them into reactor B, heat to 45° C., and stir at 90 r / min for 35 min to obtain mixture B for standby use;

[0046] S3. Add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and the mixture B obtained in step S2 to the mixture A according to parts by weight, heat to 45° C., and stir thoroughly for 15 minutes until the mixture is evenly dispersed to obtain a laser electrochemical aluminum color layer coating.

[0047] Example 4

[0048] A laser electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 11.5 parts of polyurethane resin, 25 parts of hydroxyl-containing acrylate resin, 2 parts of polyurea resin, 4.5 parts of amino resin, 5 parts of nitrocellulose, 2.5 parts of high-functionality acrylate, 2 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 4 parts of reinforcing sol, 4.5 parts of hexamethylene diisocyanate trimer, 2.2 parts of hydroxypropyl acrylate and 42 parts of solvent.

[0049] The hydroxyl-containing acrylic resin adopts L-1260 hydroxyl-containing acrylic resin provided by Guangdong Sanqi New Materials Co., Ltd., the polyurea resin adopts asparagus polyurea resin produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., and the amino resin adopts CYMEL325 amino resin produced by Allnex Resins (China) Co., Ltd.

[0050] The high-functionality acrylate is propoxylated trimethylolpropane triacrylate, and the reinforcing sol is ZrO 2 Sol and SiO 2 The sol is a mixture composed of a mass ratio of 0.7:1.3, and the solvent is n-propanol.

[0051] The laser electrochemical aluminum color layer coating is prepared by the following steps:

[0052] S1. Add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functionality acrylate into reaction kettle A according to parts by weight, heat to 50° C., and stir at a speed of 300 r / min for 1 hour to obtain mixture A for standby use;

[0053] S2. Mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol according to weight, add them into reactor B, heat to 40° C., and stir at a speed of 120 r / min for 40 min to obtain mixture B for standby use;

[0054] S3. Add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and the mixture B obtained in step S2 to the mixture A according to parts by weight, heat to 40° C., and stir thoroughly for 20 minutes until the mixture is evenly dispersed to obtain a laser electrochemical aluminum color layer coating.

[0055] Example 5

[0056] A laser electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 12 parts of polyurethane resin, 28 parts of hydroxyl-containing acrylate resin, 3 parts of polyurea resin, 5 parts of amino resin, 5 parts of nitrocellulose, 3 parts of high-functionality acrylate, 3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 5 parts of reinforcing sol, 5 parts of hexamethylene diisocyanate trimer, 3 parts of hydroxypropyl acrylate and 50 parts of solvent.

[0057] The hydroxyl-containing acrylic resin adopts L-1260 hydroxyl-containing acrylic resin provided by Guangdong Sanqi New Materials Co., Ltd., the polyurea resin adopts asparagus polyurea resin produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., and the amino resin adopts CYMEL325 amino resin produced by Allnex Resins (China) Co., Ltd.

[0058] The high-functionality acrylate is trimethylolpropane triacrylate, and the reinforcing sol is ZrO2 Sol and SiO 2 A mixture composed of sol in a mass ratio of 0.8:1.4, and the solvent is propylene glycol methyl ether.

[0059] The laser aluminized color layer coating is prepared through the following steps:

[0060] S1. By weight, add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functional acrylate into reaction kettle A, heat to 55 °C, and stir at a speed of 240 r / min for 1.5 h to obtain mixture A for standby;

[0061] S2. By weight, mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol and add them into reaction kettle B, heat to 45 °C, and stir at a speed of 100 r / min for 30 min to obtain mixture B for standby;

[0062] S3. By weight, add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and mixture B obtained in step S2 into mixture A, heat to 45 °C, and stir thoroughly for 16 min until evenly dispersed to obtain the laser aluminized color layer coating.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Example 3 above is that: the raw materials of the laser aluminized color layer coating in this comparative example do not add hydroxyl-containing acrylate resin and polyurea resin. The rest of this comparative example is the same as that of Example 3 and will not be elaborated here.

[0065] Perform performance tests on the laser aluminized color layer coatings prepared in Example 1, Example 3 and Comparative Example 1, as well as a commercially available laser aluminized color layer coating produced by a certain company. The results are shown in Table 1.

[0066] Test the peel strength: Test according to the method in the national standard "GB / T 7122-1996 Determination of peel strength of high-strength adhesives - Floating roller method".

[0067] Abrasion resistance: Test using a Taber rotary evaporation abrasion tester, with a load of 2.5 N, the counterweight is an H18 type grinding wheel, the rotation speed is 60 r / min, and the mass loss of the paint film is tested after 50 laps.

[0068] Adhesion: Perform a cross-cut test on the coating surface by the method in the national standard "GB / T 9286-2021 Paints and varnishes - Cross-cut test".

[0069] Laser holographic effect: Visually observe under sunlight of different intensities.

[0070] Water resistance: Tested according to Method A in the national standard "GB / T 1733-1993 Determination of water resistance of paint films".

[0071] Ethanol resistance: Rub back and forth with 99.6% alcohol under a force of 500 g / cm². One back-and-forth movement counts as 1 time, with a stroke of 2 - 3 cm.

[0072] Solid content: Tested according to the method in the national standard "GB / T 1725-2007 Determination of non-volatile matter content of paints, varnishes and plastics".

[0073] Table 1

[0074]

[0075] From the test results of Examples 1 and 3, it can be seen that the laser electroaluminum color layer coating prepared by the present invention has good mechanical properties such as adhesion fastness, scratch resistance, peel strength, etc., as well as excellent laser holographic effect and drying rate.

[0076] From the comparison of the test results of Examples 1, 3 and Comparative Example 1, it can be seen that adding hydroxyl acrylate resin and polyurea resin to the formula under the same conditions can make the prepared protective layer coating have good mechanical properties such as adhesion fastness, scratch resistance, etc., as well as excellent laser holographic effect, etc., and has broad market prospects and application value; from the comparison of the test results of Examples 1, 3 and the existing anti-counterfeiting coatings, it can be seen that the laser electroaluminum color layer coating in the present invention has good comprehensive performance.

[0077] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious substitution without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A laser electrochemical aluminum color layer coating, characterized in that: The invention comprises the following raw materials in parts by weight: 10-15 parts of polyurethane resin, 20-30 parts of hydroxyl-containing acrylate resin, 1-5 parts of polyurea resin, 3-7 parts of amino resin, 4-8 parts of nitrocellulose, 1-5 parts of high-functionality acrylate, 1-3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-8 parts of reinforcing sol, 3-7 parts of hexamethylene diisocyanate trimer, 1-5 parts of hydroxypropyl acrylate and 30-60 parts of solvent.

2. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 10-12 parts of polyurethane resin, 24-28 parts of hydroxyl-containing acrylate resin, 1-3 parts of polyurea resin, 3-5 parts of amino resin, 4-5 parts of nitrocellulose, 1-3 parts of high-functionality acrylate, 1-3 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 3-5 parts of reinforcing sol, 3-5 parts of hexamethylene diisocyanate trimer, 1-3 parts of hydroxypropyl acrylate and 30-50 parts of solvent.

3. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The polyurethane resin is polyester polyurethane, and its weight average molecular weight is 20,000-30,000.

4. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The weight average molecular weight of the hydroxyl-containing acrylic resin is 30,000-40,000.

5. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The high-functionality acrylate is one or more of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate.

6. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The reinforcing sol is a mixture of ZrO2 sol and SiO2 sol in a mass ratio of 0.4-0.8:1.0-1.

4.

7. The laser electrochemical aluminum color layer coating according to claim 1, characterized in that: The solvent is one or more of ethyl acetate, n-propanol, n-butanol, propylene glycol methyl ether, n-propyl acetate, and n-butyl acetate.

8. A method for preparing the laser electrochemical aluminum color layer coating according to any one of claims 1 to 7, characterized in that: Prepared by the following steps: S1. Add polyurethane resin, hydroxyl-containing acrylate resin, polyurea resin, amino resin, solvent and high-functionality acrylate to reaction kettle A according to weight parts, heat to 50-60° C., and stir at a speed of 180-300 r / min for 1-3 hours to obtain mixture A for standby use; S2. Mix hexamethylene diisocyanate trimer, hydroxypropyl acrylate, nitrocellulose and reinforcing sol according to weight, add them into reactor B, heat to 40-50° C., and stir at a speed of 60-120 r / min for 20-40 min to obtain mixture B for standby use; S3. Add 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and the mixture B obtained in step S2 to the mixture A according to parts by weight, heat to 40-50° C., and stir for 10-20 minutes until the mixture is evenly dispersed to obtain a laser electrochemical aluminum color layer coating.

Images