Waterproof high-brightness wear-resistant waterborne electrochemical aluminum coating and preparation method thereof

Abstract

The application provides a water-resistant high-brightness wear-resistant water-based electrochemical aluminum paint and a preparation method thereof. The electrochemical aluminum paint comprises the following raw materials in parts by weight: 10-17 parts of silicon-modified acrylic resin, 50-90 parts of acrylic resin, 0-1 part of a surface control agent, 0-10 parts of a reinforcing agent, and 10-200 parts of a solvent. The preparation method of the electrochemical aluminum paint is simple and suitable for industrial large-scale production. The water-resistant high-brightness wear-resistant water-based electrochemical aluminum paint is prepared by matching the silicon-modified acrylic resin and the acrylic resin and other raw materials, and the raw materials synergistically act to make the prepared electrochemical aluminum paint have good hydrophobicity and wear resistance, maintain high gloss, have the functions of a release agent and a color layer paint, and realize the two-in-one of the release and the color layer. The preparation method of the electrochemical aluminum paint is simple and conducive to industrial production.

Description

Technical Field

[0001] This invention relates to the field of electroplated aluminum technology, specifically to a water-resistant, high-brightness, and wear-resistant water-based electroplated aluminum coating and its preparation method. Background Technology

[0002] Electroplated aluminum coatings are widely used in packaging, decoration, printing, and other fields, requiring good gloss, abrasion resistance, and water resistance. However, while commercially available water-based electroplated aluminum coatings are environmentally friendly, they generally suffer from poor water resistance, insufficient abrasion resistance, and short gloss retention time. Existing technologies mostly use conventional acrylic resins as film-forming substances, which have high surface energy, resulting in strong hydrophilicity, a small contact angle, and poor water resistance. This makes them prone to water stains and whitening, affecting appearance and service life. Simultaneously, their insufficient abrasion resistance makes them easily worn in high-frequency use environments, leading to a rapid decrease in gloss. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating and its preparation method. This electroplated aluminum coating exhibits strong hydrophobicity and wear resistance while maintaining high gloss, and functions as both a release agent and a color coating, achieving a two-in-one release and color layer. The preparation method of this electroplated aluminum coating is simple and conducive to industrial production.

[0004] The objective of this invention is achieved through the following technical solution: A water-resistant, high-gloss, wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 10-17 parts of silicone-modified acrylic resin, 50-90 parts of acrylic resin, 0-1 parts of surface control agent, 0-10 parts of reinforcing agent, and 10-200 parts of solvent.

[0005] Furthermore, each part of the silicone-modified acrylic resin comprises the following raw materials in parts by weight: 30-85 parts of hard monomer, 15-30 parts of soft monomer, 15-25 parts of functional monomer, 5-10 parts of silicone-containing monomer, 1-5 parts of initiator, 0.1-2 parts of emulsifier, 50-100 parts of solvent, and 1-10 parts of pH adjuster.

[0006] Furthermore, the hard monomer is at least one selected from methyl methacrylate, methacrylic acid, dicyclopentyl acrylate, and styrene-acrylonitrile.

[0007] Furthermore, the soft monomer is at least one of butyl acrylate, ethyl acrylate, and lauryl methacrylate; the functional monomer is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

[0008] Furthermore, the functional monomer is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

[0009] Furthermore, the silicon-containing monomer is at least one of vinyltrimethoxysilane and propyltrimethoxysilane.

[0010] Furthermore, the initiator is at least one of ammonium persulfate and potassium persulfate.

[0011] Furthermore, the emulsifier is sodium allyloxyhydroxypropyl sulfonate.

[0012] Furthermore, the water-resistant, high-gloss, and wear-resistant water-based electroplated aluminum coating and the solvent used are at least one of deionized water, anhydrous ethanol, and methanol.

[0013] Furthermore, the pH adjuster is at least one of ammonia and AMP-95.

[0014] Furthermore, the preparation method of each portion of the silicone-modified acrylic resin includes the following steps: Step 1: Pre-emulsion preparation Add a portion of solvent, emulsifier, hard monomer, soft monomer, functional monomer, and silicon-containing monomer to a pre-emulsification tank; emulsify under stirring to form a uniform and stable pre-emulsion; Step 2: Preparation of the initiator solution Dissolve the initiator in the remaining solvent to prepare an initiator solution; Step 3: Polymerization reaction (A1) In a reaction vessel, add part of the pre-emulsion and part of the initiator solution, stir and heat to 78-82℃ to carry out the seed reaction; (A2) Add the remaining pre-emulsion and the remaining initiator solution dropwise to the reaction solution, controlling the dropping time and maintaining the reaction temperature at 78-82℃; (A3) After the addition is complete, the temperature is raised to 85-87℃ and maintained to ensure that the monomer conversion rate is >99%; (A4) Cool the system to 60-65℃, adjust the pH of the emulsion to 7.5-8.5 with a pH adjuster, and keep it at this temperature; (A5) Cool the reaction solution and filter it to obtain a silicone-modified acrylic resin emulsion.

[0015] The silicone-modified acrylic resin of this invention, through the use of the aforementioned raw materials and a designed preparation process, forms a stable Si-O-Si crosslinked network in the reaction system, effectively improving the hydrophobicity and abrasion resistance of the coating film while maintaining high gloss. Specifically, during the dropwise addition of the remaining pre-emulsion and initiator solution, temperature control prevents excessively high temperatures that could cause explosive polymerization; similarly, controlling the temperature during the post-condensation stage prevents excessively high temperatures that could cause gelation. The weakly alkaline environment during the post-condensation stage has a significant impact on the hydrolytic condensation of siloxanes; a pH less than 7 results in a slow reaction. Furthermore, by employing a pre-emulsification dropwise addition method and controlling the monomer addition sequence, this invention ensures a uniform copolymer composition and avoids self-polymerization of silicon monomers. All monomers, emulsifiers, and initiators used in this invention are commercially available industrial-grade chemicals.

[0016] Furthermore, in step (A1), when the seeds react until the reaction solution produces latex-like seeds, they are kept at a temperature of 78-82℃ for 15-20 minutes.

[0017] Furthermore, in step (A4), the system is cooled to 60-65°C, and the pH of the emulsion is adjusted to 7.5-8.5 using a pH adjuster. Under these conditions, the system is kept at this temperature for 30-90 minutes.

[0018] Furthermore, the surface control agent is at least one of an antifoaming agent and a leveling agent.

[0019] Furthermore, each part of the reinforcing agent comprises the following raw materials in parts by weight: 1-5 parts of nano-silica, 0.5-2.5 parts of 2-hydroxyethyl methacrylate phosphate, and 0.5-2.5 parts of zirconium acetylacetonate. The particle size of the nano-silica is 20-50 nm. This invention forms a composite reinforcing agent by combining nano-silica, 2-hydroxyethyl methacrylate phosphate, and zirconium acetylacetonate. 2-hydroxyethyl methacrylate phosphate improves the adhesion between the coating and the substrate, while the addition of nano-silica enhances the hardness and abrasion resistance of the coating. Zirconium acetylacetonate can coordinate with hydroxyl groups in the phosphate ester and resin to form a denser cross-linked network and facilitates interfacial bonding between nanoparticles and resin, preventing phase separation. This invention, through the synergistic effect of nano-silica, 2-hydroxyethyl methacrylate phosphate, and zirconium acetylacetonate, effectively improves the adhesion, abrasion resistance, and water resistance of the coating, contributing to the formation of a continuous and dense coating film.

[0020] The present invention also provides a method for preparing the above-mentioned water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating, comprising the following steps: mixing silicone-modified acrylic resin, acrylic resin, surface control agent, reinforcing agent and solvent in proportion to obtain water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating.

[0021] In the preparation of the water-resistant, high-gloss, and wear-resistant electroplated aluminum coating of the present invention, silicone-modified acrylic resin and high-toughness acrylic resin are selected to improve the hydrophobicity and wear resistance of the coating film, while maintaining high gloss and improving peel strength, thereby enhancing the brightness and peel performance of the film surface after film formation. Furthermore, surface control agents and reinforcing agents are selected to improve the on-machine application performance and stability of the coating film. All raw materials achieve good coordination and synergistic effect to obtain the final water-resistant, high-gloss, and wear-resistant electroplated aluminum coating.

[0022] The beneficial effects of this invention are as follows: This invention prepares a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating by combining raw materials such as silicon-modified acrylic resin and acrylic resin. The synergistic effect of each raw material gives the prepared electroplated aluminum coating good hydrophobicity and wear resistance, while maintaining high gloss. It also functions as a release agent and color coating, achieving a two-in-one release and color layer. The preparation method of the electroplated aluminum coating is simple and conducive to industrial production. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0024] In some embodiments of the present invention, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 10-17 parts of silicone-modified acrylic resin, 50-90 parts of acrylic resin, 0-1 part of surface control agent, 0-10 parts of reinforcing agent, and 10-200 parts of solvent.

[0025] In some embodiments of the present invention, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 10-17 parts of silicone-modified acrylic resin, 50-80 parts of acrylic resin, 0.5-1 part of surface control agent, 2-10 parts of reinforcing agent, and 20-100 parts of solvent.

[0026] In some embodiments of the present invention, each part of the silicone-modified acrylic resin comprises the following parts by weight of raw materials: 30-85 parts of hard monomer, 15-30 parts of soft monomer, 15-25 parts of functional monomer, 5-10 parts of silicon-containing monomer, 1-5 parts of initiator, 0.1-2 parts of emulsifier, 50-100 parts of solvent, and 1-10 parts of pH adjuster.

[0027] In some embodiments of the present invention, the hard monomer is at least one selected from methyl methacrylate, methacrylic acid, dicyclopentyl acrylate, and styrene-acrylonitrile.

[0028] In some embodiments of the present invention, the soft monomer is at least one of butyl acrylate, ethyl acrylate, and lauryl methacrylate; the functional monomer is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

[0029] In some embodiments of the present invention, the functional monomer is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

[0030] In some embodiments of the present invention, the silicon-containing monomer is at least one of vinyltrimethoxysilane and propyltrimethoxysilane.

[0031] In some embodiments of the present invention, the initiator is at least one of ammonium persulfate and potassium persulfate.

[0032] In some embodiments of the present invention, the emulsifier is sodium allyloxyhydroxypropyl sulfonate.

[0033] In some embodiments of the present invention, the water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating and the solvent used are at least one of deionized water, anhydrous ethanol, and methanol.

[0034] In some embodiments of the present invention, the pH adjuster is at least one of ammonia and AMP-95.

[0035] In some embodiments of the present invention, the preparation method of each part of the silicone-modified acrylic resin includes the following steps: Step 1: Pre-emulsion preparation In a pre-emulsification tank, add 60-90% of the formulation amount of deionized water, along with emulsifiers, hard monomers, soft monomers, functional monomers, and silicon-containing monomers; emulsify for 30-40 minutes under high-speed stirring (stirring speed > 500 rpm) to form a uniform and stable pre-emulsion. Step 2: Preparation of the initiator solution Dissolve the initiator in the remaining solvent to prepare an initiator solution; Step 3: Polymerization reaction (A1) Initial feeding and heating: In a four-necked flask equipped with a stirrer, thermometer, condenser and constant pressure dropping funnel Add 10-15% of the pre-emulsion and 10-30% of the initiator solution to the mixture, stir and heat to 78-82℃; when the reaction solution shows obvious blue light (a sign of emulsion polymerization), it indicates that latex particles "seeds" have been generated, and keep at this temperature for 15-20 minutes. (A2) Dropping reaction: The remaining pre-emulsion and the remaining initiator solution are simultaneously added dropwise through a constant pressure dropping funnel. The dropping time is controlled to be completed within 3-4 hours, and the reaction temperature is maintained at 78-82℃. (A3) High-temperature heat preservation and post-treatment: After the addition is completed, the temperature is raised to 85-87℃ and kept at this temperature for 1-1.5 hours to ensure that the monomer conversion rate is >99%; (A4) Functional group hydrolysis and condensation: Cool the system to 60-65℃, adjust the pH of the emulsion to weakly alkaline (7.5-8.5) with a pH adjuster, and keep it at this temperature for 30-90 min to hydrolyze the methoxy groups (-OCH3) on the organosilicon monomers to generate silanol groups (Si-OH), which further condense to form a stable Si-O-Si crosslinking network, thereby effectively improving the hydrophobicity and mechanical properties of the resin; (A5) Cooling and discharge: Cool the reaction solution to below 40°C, filter, and obtain a milky white silicone-modified acrylic resin emulsion with a solid content of 40-45% and a slight blue tint.

[0036] In some embodiments of the present invention, the acrylic resin may be a styrene-acrylic emulsion with a viscosity of 50-500 mPa·s at 25°C.

[0037] In some embodiments of the present invention, the surface control agent is at least one of a defoamer and a leveling agent.

[0038] In some embodiments of the present invention, each part of the reinforcing agent comprises the following raw materials in parts by weight: 1-5 parts of nano-silica, 0.5-2.5 parts of 2-hydroxyethyl methacrylate phosphate, and 0.5-2.5 parts of zirconium acetylacetonate. The nano-silica has a particle size of 20-50 nm.

[0039] In some embodiments of the present invention, the preparation method of the reinforcing agent includes the following steps: adding nano-silica and 2-hydroxyethyl methacrylate phosphate to deionized water, wherein the sum of the amount of deionized water added and the amount of nano-silica and 2-hydroxyethyl methacrylate phosphate added is 0.5-2:1, stirring at a speed of 500-1000 rpm for 10-60 min, then adding zirconium acetylacetonate, and stirring for 10-60 min to obtain a reinforcing agent dispersion.

[0040] In some embodiments of the present invention, a method for preparing a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating includes the following steps: mixing silicone-modified acrylic resin, acrylic resin, surface control agent, reinforcing agent, and solvent in proportion to obtain a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating.

[0041] In some embodiments of the present invention, a method for preparing a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating includes the following steps: adding acrylic resin, silicone-modified acrylic resin, and surface control agent sequentially to a solvent, stirring at 300-800 rpm for 10-30 min to obtain a uniform resin mixture; then adding a reinforcing agent dispersion to the resin mixture, stirring for 20-60 min to obtain a preliminary coating product; and finally filtering the preliminary coating product through a 100-300 mesh filter to obtain a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating. Example 1

[0042] In this embodiment, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 10 parts silicone-modified acrylic resin, 58 parts acrylic resin, 0.5 parts defoamer, 0.5 parts leveling agent, 6 parts reinforcing agent, 21 parts anhydrous ethanol, and 10 parts deionized water. The acrylic resin used is DSM Neocryl XK-82 waterborne acrylic resin. The defoamer used is BYK-024 defoamer, and the leveling agent used is BYK-345 leveling agent.

[0043] Furthermore, each part of the said silicone-modified acrylic resin comprises the following raw materials in parts by weight: 30 parts methyl methacrylate, 3 parts methacrylic acid, 10 parts vinyltrimethoxysilane, 20 parts butyl acrylate, 20 parts hydroxyethyl acrylate, 0.5 parts ammonium persulfate, 2 parts sodium allyl hydroxypropyl sulfonate, and 30 parts deionized water.

[0044] Furthermore, the water-resistant, high-gloss, and wear-resistant water-based electroplated aluminum coating and the solvent used are at least one of deionized water, anhydrous ethanol, and methanol.

[0045] Furthermore, the preparation method of each portion of the silicone-modified acrylic resin includes the following steps: Step 1: Pre-emulsion preparation In a pre-emulsification tank, add 80% of the formula amount of deionized water, along with emulsifiers, hard monomers, soft monomers, functional monomers, and silicon-containing monomers; emulsify for 30 minutes under high-speed stirring at a speed of 600 rpm to form a uniform and stable pre-emulsion. Step 2: Preparation of the initiator solution Dissolve the initiator in the remaining deionized water to prepare an initiator solution; Step 3: Polymerization reaction (A1) Initial feeding and heating: In a four-necked flask equipped with a stirrer, thermometer, condenser and constant pressure dropping funnel Add 15% of the pre-emulsion and 20% of the initiator solution to the mixture, stir and heat to 80°C; when the reaction solution shows obvious blue light (a sign of emulsion polymerization), it indicates that latex particles "seeds" have been generated, and keep it at this temperature for 20 minutes. (A3) Dropping reaction: The remaining pre-emulsion and the remaining initiator solution are simultaneously added dropwise through a constant pressure dropping funnel, and the dropping time is controlled to be completed within 3.5 hours, while maintaining the reaction temperature at 80°C; (A4) High-temperature heat preservation and post-treatment: After the addition is completed, the temperature is raised to 86℃ and kept at this temperature for 1.5 hours to ensure that the monomer conversion rate is >99%; (A5) Functional group hydrolysis and condensation: The system was cooled to 62°C, and the pH of the emulsion was adjusted to 8.0 with a pH adjuster. Under this condition, the system was kept at this temperature for 60 min, which caused the methoxy groups (-OCH3) on the organosilicon monomers to hydrolyze and generate silanol groups (Si-OH), which then condensed to form a stable Si-O-Si crosslinking network, thereby effectively improving the hydrophobicity and mechanical properties of the resin; the pH adjuster was ammonia. (A6) Cooling and discharge: Cool the reaction solution to 35°C, filter, and obtain a milky white silicone-modified acrylic resin emulsion with a slight blue light.

[0046] Furthermore, the reinforcing agent comprises the following raw materials in parts by weight: 3 parts nano-silica, 1.5 parts 2-hydroxyethyl methacrylate phosphate, and 1.5 parts zirconium acetylacetonate. The nano-silica has a particle size of 20-50 nm.

[0047] Furthermore, the preparation method of the reinforcing agent includes the following steps: adding nano-silica and 2-hydroxyethyl methacrylate phosphate to deionized water, wherein the sum of the amount of deionized water added and the amount of nano-silica and 2-hydroxyethyl methacrylate phosphate added is 1:1, stirring at 600 rpm for 30 min, then adding zirconium acetylacetone, and stirring for 20 min to obtain the reinforcing agent dispersion.

[0048] In this embodiment, the preparation method of the water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating includes the following steps: acrylic resin, silicone-modified acrylic resin, and surface control agent are added sequentially to a solvent and stirred at 600 rpm for 30 minutes to obtain a uniform resin mixture; then, the reinforcing agent dispersion is added to the resin mixture and stirred for 30 minutes to obtain a preliminary coating product; then, the preliminary coating product is filtered through a 200-mesh filter to obtain the water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating. Example 2

[0049] In this embodiment, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 15 parts of silicone-modified acrylic resin, 54 parts of acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 6 parts of reinforcing agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water.

[0050] The rest of this embodiment is the same as that in Embodiment 1. Example 3

[0051] In this embodiment, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating comprises the following raw materials in parts by weight: 17 parts of silicone-modified acrylic resin, 51 parts of acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 6 parts of reinforcing agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water.

[0052] The rest of this embodiment is the same as that in Embodiment 1.

[0053] Comparative Example 1 The difference between this comparative example and Example 1 is that: in this comparative example, a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating includes the following raw materials in parts by weight: 30 parts of silicone-modified acrylic resin, 38 parts of DSM Neocryl XK-82 waterborne acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 6 parts of reinforcing agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water.

[0054] The rest of this comparative example is the same as in Example 1.

[0055] Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, an electroplated aluminum coating comprises the following raw materials in parts by weight: 20 parts of silicone-modified acrylic resin, 48 parts of DSM Neocryl XK-82 waterborne acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 6 parts of reinforcing agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water.

[0056] The rest of this comparative example is the same as in Example 1.

[0057] Comparative Example 3 The difference between this comparative example and Example 1 is that the electroplated aluminum coating in this comparative example comprises the following raw materials in parts by weight: 10 parts of self-made ordinary acrylic resin, 58 parts of DSM Neocryl XK-82 waterborne acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 6 parts of reinforcing agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water. Compared with the silicone-modified acrylic resin of Example 1, the difference in the self-made ordinary acrylic resin is that vinyltrimethoxysilane is replaced with an equal amount of methyl methacrylate; the remaining components and preparation method are completely the same.

[0058] Comparative Example 4 The difference between this comparative example and Example 1 is that in this comparative example, an electroplated aluminum coating includes the following raw materials in parts by weight: 10 parts of silicone-modified acrylic resin, 64 parts of DSM Neocryl XK-82 waterborne acrylic resin, 0.5 parts of defoamer, 0.5 parts of leveling agent, 21 parts of anhydrous ethanol, and 10 parts of deionized water.

[0059] The rest of this comparative example is the same as in Example 1.

[0060] The raw material compositions of the electroplated aluminum coatings of Examples 1 and Comparative Examples 1-4 are shown in Table 1 below: The electroplated aluminum coatings prepared in Example 1 and Comparative Examples 1-3 were coated on PET films with a thickness of 25 μm, dried at 60°C for 30 min, and then cut into 80×80 mm test samples for performance testing.

[0061] The technical specifications are shown in Table 2 below: The test results of Example 1 and Comparative Examples 1-3 are shown in Table 2 below: As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, when the amount of silicone-modified acrylic resin is too high, the light transmittance of the coating decreases, whitening and pinholes appear, indicating that excessive silicone resin may affect the uniformity and compatibility of the coating. Therefore, by combining the amount of silicone-modified resin with acrylic resin and other raw materials, and carefully adjusting the amount of raw materials, a better balance between water resistance and abrasion resistance can be achieved while ensuring high light transmittance and good color development.

[0062] As can be seen from the comparison between Example 1 and Comparative Example 3, after introducing silicon-containing monomers, the contact angle of the coating increased from 81° to 108°, and the hydrophobicity and wear resistance were effectively improved. This indicates that the silicon-modified acrylic resin prepared by the participation of vinyltrimethoxysilane in the copolymerization and hydrolysis condensation to form the Si-O-Si crosslinking network can effectively improve the hydrophobicity and wear resistance of the coating film when added to the coating system.

[0063] As can be seen from the comparison between Example 1 and Comparative Example 4, by adding reinforcing agents to the coating system, and achieving good compatibility with raw materials such as silicone-modified acrylic resin and acrylic resin, it is helpful to improve the hydrophobicity and wear resistance of the coating film.

[0064] In summary, this invention, by combining raw materials such as silicon-modified acrylic resin and acrylic resin and controlling the proportions of each raw material, produces a water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating. The synergistic effect of the raw materials gives the resulting electroplated aluminum coating excellent hydrophobicity and wear resistance while maintaining high gloss. The coating uses water as a medium, has extremely low VOC content, meets environmental protection requirements, and is environmentally safe. The preparation method of this electroplated aluminum coating is simple and conducive to industrial production.

[0065] The specific embodiments described above are further illustrations of the technical solution and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating, characterized in that, The raw materials include the following parts by weight: 10-17 parts of silicone-modified acrylic resin, 50-90 parts of acrylic resin, 0-1 part of surface control agent, 0-10 parts of reinforcing agent, and 10-200 parts of solvent.

2. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 1, characterized in that: Each part of the aforementioned silicone-modified acrylic resin comprises the following raw materials in parts by weight: 30-85 parts of hard monomer, 15-30 parts of soft monomer, 15-25 parts of functional monomer, 5-10 parts of silicone-containing monomer, 1-5 parts of initiator, 0.1-2 parts of emulsifier, 50-100 parts of solvent, and 1-10 parts of pH adjuster.

3. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 2, characterized in that: The hard monomer is at least one of methyl methacrylate, methacrylic acid, dicyclopentyl acrylate, and styrene-acrylonitrile.

4. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 2, characterized in that: The soft monomer is at least one of butyl acrylate, ethyl acrylate, and lauryl methacrylate.

5. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 2, characterized in that: The functional monomer is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

6. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 2, characterized in that: The silicon-containing monomer is at least one of vinyltrimethoxysilane and propyltrimethoxysilane.

7. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 2, characterized in that: The preparation method of the silicone-modified acrylic resin includes the following steps: Step 1: Pre-emulsion preparation Add a portion of solvent, emulsifier, hard monomer, soft monomer, functional monomer, and silicon-containing monomer to a pre-emulsification tank; emulsify under stirring to form a uniform and stable pre-emulsion; Step 2: Preparation of the initiator solution Dissolve the initiator in the remaining solvent to prepare an initiator solution; Step 3: Polymerization reaction (A1) In a reaction vessel, add part of the pre-emulsion and part of the initiator solution, stir and heat to 78-82℃ to carry out the seed reaction; (A2) Add the remaining pre-emulsion and the remaining initiator solution dropwise to the reaction solution, controlling the dropping time and maintaining the reaction temperature at 78-82℃; (A3) After the addition is complete, the temperature is raised to 85-87℃ and maintained to ensure that the monomer conversion rate is >99%; (A4) Cool the system to 60-65℃, adjust the pH of the emulsion to 7.5-8.5 with a pH adjuster, and keep it at this temperature; (A5) Cool down the reaction solution, filter it, and obtain the silicone-modified acrylic resin emulsion.

8. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 7, characterized in that: In step (A4), the system is cooled to 60-65℃, the pH of the emulsion is adjusted to 7.5-8.5 with a pH adjuster, and the temperature is maintained for 30-90 minutes.

9. The water-resistant, high-gloss, wear-resistant water-based electroplated aluminum coating according to claim 1, characterized in that: Each portion of the reinforcing agent comprises the following raw materials in parts by weight: 1-5 parts of nano silica, 0.5-2.5 parts of 2-hydroxyethyl methacrylate phosphate, and 0.5-2.5 parts of zirconium acetylacetonate.

10. The method for preparing the water-resistant, high-gloss, and wear-resistant waterborne electroplated aluminum coating as described in any one of claims 1-9, characterized in that: The process includes the following steps: mixing silicone-modified acrylic resin, acrylic resin, surface control agent, reinforcing agent and solvent in a certain proportion to obtain a water-resistant, high-gloss and wear-resistant water-based electroplated aluminum coating.

Images