Two-component water-based silver powder solid color paint and preparation method thereof

Abstract

The invention discloses a two-component water-based silver powder solid color paint and a preparation method thereof. The two-component water-based silver powder solid color paint is composed of a component A and a component B, and the mass ratio of the component A to the component B is 10: 1. The component A is prepared from 40 to 55 parts of hydroxyl acrylic emulsion, 25 to 35 parts of waterborne polyurethane dispersion, 0.5 to 1 part of wetting dispersant, 2 to 6 parts of coalescing agent, 2 to 6 parts of deionized water, 0.1 to 0.5 part of defoaming agent, 15 to 25 parts of titanium dioxide, 0.1 to 0.3 part of wetting flatting agent, 2 to 4 parts of matting powder, 0.5 to 1 part of thickening agent, 1 to 3 parts of hand feeling aid, 1 to 3 parts of silver powder arrangement aid, 4 to 8 parts of waterborne aluminum paste and 0.5 to 3 parts of waterborne nano color paste. The component B is prepared from the following raw materials in parts by mass: 70 to 75 parts of waterborne hexamethylene diisocyanate (HDI) type homopolymer, 20 to 25 parts of propylene glycol methyl ether acetate and 0.1 to 0.5 part of dehydrating agent. The two-component water-based silver powder solid color paint has good storage stability, and a formed paint film is not prone to color change and has excellent gloss, and the film has good weather resistance and acid and alkali resistance.

Description

Technical Field

[0001] The invention relates to a polymer coating, a two-component water-based silver powder solid color paint and a preparation method thereof. Background Art

[0002] Silver powder paint refers to aluminum silver paste dispersed in resin. In the process of forming the paint film, the flaky silver powder structure forms a parallel arrangement structure in the paint film. Under light, the paint film presents a strong metallic flash effect, making the coating show a metallic texture. It can give non-metallic materials a metallic appearance and is deeply loved by consumers. It has been widely used in 3C electronics, wheels, security doors, automobiles and other fields.

[0003] Most of the traditional silver paints are solvent-based paints, usually using a single-component silver paint and then spraying a clear varnish. They have a high organic solvent content and high VOC emissions, which seriously pollute the environment and harm human health. However, two-component water-based paints are environmentally friendly, non-toxic, and easy to construct because of their low VOC emissions. They can largely avoid the serious air pollution problems caused by solvent-based paints. Under the current environmental protection policy, water-based paints have a good development prospect.

[0004] For example, a Chinese patent with publication number CN117126591A discloses a water-based acrylic polyurethane silver powder paint, which is composed of component A and component B. Component A includes water-based hydroxy acrylic emulsion, defoamer, deionized water, wetting dispersant, propylene glycol butyl ether, water-based silver powder, ethylene vinyl acetate copolymer wax emulsion, water-dispersible cellulose ester, and substrate wetting agent. Component B is an isocyanate curing agent. The above silver powder paint has low hiding power and strong fluidity, and may sag during construction, resulting in uneven coating.

[0005] In view of this, the present invention proposes a two-component water-based silver powder solid color paint and a preparation method thereof to solve the above problems. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned technologies, the present invention provides a two-component water-based silver powder solid color paint, in which the components are compatible, can be stably and durably stored, and the paint film formed by coating is uniform and has excellent hiding power and weather resistance.

[0007] To achieve the above object, the present invention provides a two-component water-based silver powder solid color paint, which consists of a component A and a component B, and the mass ratio of the component A to the component B is 10:1.

[0008] The component A includes the following raw materials in parts by mass: 40 to 55 parts of hydroxy acrylic emulsion, 25 to 35 parts of waterborne polyurethane dispersion, 0.5 to 1 part of wetting dispersant, 2 to 6 parts of film-forming aid, 2 to 6 parts of deionized water, 0.1 to 0.5 part of defoaming agent, 15 to 25 parts of titanium dioxide, 0.1 to 0.3 parts of wetting and leveling agent, 2 to 4 parts of matting powder, 0.5 to 1 part of thickener, 1 to 3 parts of feel aid, 1 to 3 parts of silver powder arrangement aid, 4 to 8 parts of waterborne aluminum silver paste, and 0.5 to 3 parts of waterborne nano color paste.

[0009] The B component comprises the following raw materials in parts by weight: 70-75 parts of water-based hexamethylene diisocyanate (HDI) homopolymer, 20-25 parts of propylene glycol methyl ether acetate, and 0.1-0.5 parts of a dehydrating agent; the water-based polyurethane dispersion can be dispersed in the hydroxylated acrylic emulsion and the B component.

[0010] Preferably, the mass content of non-volatile solids in the hydroxylated acrylic emulsion is 30% to 50%, the mass content of hydroxyl groups in the non-volatile solids is 1.6%, and the fineness of the hydroxylated acrylic emulsion is 1 to 15 μm.

[0011] Preferably, the mass content of solids in the aqueous polyurethane dispersion is 30% to 50%.

[0012] Preferably, the aqueous polyurethane dispersion is Lacper® 4219 of Wanhua Chemical Group or S7601 dispersion of Zhanchen.

[0013] Preferably, the thickener is fumed silica.

[0014] Preferably, the matting agent comprises an organic thermosetting polymethyl urea polymer.

[0015] Preferably, the hand feel aid comprises at least one of an organosilicon compound and a wax emulsion.

[0016] Preferably, the silver powder arrangement aid is a modified ethylene vinyl acetate copolymer wax emulsion and / or cellulose acetate butyrate.

[0017] Preferably, the wetting and leveling agent is a silicone surfactant.

[0018] To achieve the above object, the present invention also provides a method for preparing a two-component water-based silver powder solid color paint.

[0019] The preparation of component A comprises the following steps: Step 1: Add hydroxyl acrylic emulsion and waterborne polyurethane dispersion into the dispersion tank and stir evenly. During the stirring process of hydroxyl acrylic emulsion and waterborne polyurethane dispersion, slowly add wetting dispersant, film-forming aid, deionized water, defoaming agent, titanium dioxide, wetting and leveling agent, matting powder and thickener, and continue stirring until the fineness of the mixture is ≤30μm.

[0020] Step 2: Add a hand feel additive, a silver powder arrangement additive, a water-based aluminum silver paste, a water-based nano color paste, and deionized water into a dispersion tank, stir evenly, and filter to obtain component A.

[0021] The preparation of component B comprises the following steps: adding a dehydrating agent to a propylene glycol methyl ether acetate solution and dehydrating for 24 hours; then adding an aqueous hexamethylene diisocyanate (HDI) type homopolymer and stirring evenly to obtain component B; When the two-component water-based silver powder solid color paint is used, the component A and the component B are mixed at a mass ratio of 10:1, and deionized water is added to adjust the viscosity of the two-component water-based silver powder solid color paint.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The hydroxy acrylic emulsion, waterborne polyurethane dispersion and wetting dispersant in component A of the present invention work synergistically, so that the waterborne aluminum paste, titanium dioxide and waterborne nano color paste are stably and evenly dispersed in component A, thereby improving the storage stability of component A and preventing the silver particles of the aluminum paste from floating on the surface of the paint film.

[0023] 2. During the construction process, hydroxyl acrylic emulsion and waterborne polyurethane dispersion can react with waterborne hexamethylene diisocyanate (HDI) homopolymer to form a paint film with a cross-linked network structure. Since hydroxyl acrylic emulsion and waterborne polyurethane dispersion can be tightly combined with the silver particles of waterborne aluminum silver paste, the paint film can tightly wrap the silver particles, reduce the shedding of silver particles in the paint film, and make the gloss of the paint film lasting.

[0024] 3. The thickener and wetting and leveling agent in component A work together to make component A have suitable leveling properties, which is conducive to forming a paint film with uniform thickness and smoothness. In addition, the thickener is fumed silica, which can improve the mechanical properties and weather resistance of the paint film.

[0025] 4. Titanium dioxide has good hiding power, can cover the base material, and has high gloss and good stability. Water-based nano-color paste can be dissolved in component A, and together with the silver powder arrangement additive, it promotes the arrangement of silver particles, making the paint film have excellent gloss. DETAILED DESCRIPTION

[0026] The features of the present invention and other related features are further described in detail below through embodiments to facilitate understanding by those skilled in the art: An embodiment of the present invention provides a two-component water-based silver powder solid color paint, which consists of a component A and a component B, and the mass ratio of the component A to the component B is 10:1.

[0027] The component A includes the following raw materials in parts by mass: 40 to 55 parts of hydroxy acrylic emulsion, 25 to 35 parts of waterborne polyurethane dispersion, 0.5 to 1 part of wetting dispersant, 2 to 6 parts of film-forming aid, 2 to 6 parts of deionized water, 0.1 to 0.5 part of defoaming agent, 15 to 25 parts of titanium dioxide, 0.1 to 0.3 parts of wetting and leveling agent, 2 to 4 parts of matting powder, 0.5 to 1 part of thickener, 1 to 3 parts of feel aid, 1 to 3 parts of silver powder arrangement aid, 4 to 8 parts of waterborne aluminum silver paste, and 0.5 to 3 parts of waterborne nano color paste.

[0028] The B component comprises the following raw materials in parts by weight: 70-75 parts of water-based hexamethylene diisocyanate (HDI) homopolymer, 20-25 parts of propylene glycol methyl ether acetate, and 0.1-0.5 parts of a dehydrating agent; the water-based polyurethane dispersion can be dispersed in the hydroxylated acrylic emulsion and the B component.

[0029] In some embodiments, the mass content of non-volatile solids in the hydroxyl acrylic emulsion is 30% to 50%, and the mass content of hydroxyl groups in the non-volatile solids is 1.6%. The low hydroxyl content helps to reduce the amount of curing agent and emulsifier used, reduce the VOC content in the paint body and improve the water resistance of the paint film. The fineness of the hydroxyl acrylic emulsion is 1 to 15 μm.

[0030] In some embodiments, the mass content of solids in the aqueous polyurethane dispersion is 30% to 50%, and the aqueous polyurethane dispersion is Lacper® 4219 of Wanhua Chemical Group or S7601 dispersion of Zhanchen.

[0031] In some embodiments, the thickener is fumed silica, which can improve the mechanical properties and weather resistance of the paint film.

[0032] In some embodiments, the matting powder includes an organic thermosetting polymethylurea polymer, which contains reactive hydroxymethyl groups in the molecule, and can provide a matting effect, thereby adjusting the glossiness of the water-based silver powder solid color paint. Moreover, the matting powder can also increase the hardness of the paint film and the adhesion of the water-based silver powder solid color paint to a certain extent.

[0033] In some embodiments, the feel aid includes at least one of an organosilicon compound and a wax emulsion, which is used to improve the touch of the paint film.

[0034] In some embodiments, the silver powder arrangement aid is a modified ethylene vinyl acetate copolymer wax emulsion and / or cellulose acetate butyrate, which can quickly align the silver particles and improve the flash effect of the silver particles without affecting the leveling of the paint film, while preventing the silver particles from settling.

[0035] In some embodiments, the wetting and leveling agent is a silicone surfactant, which can reduce the surface tension of the paint body and facilitate wetting of the substrate.

[0036] In some embodiments, the water-based nano-color paste has a fineness of less than 1000 nm and a small particle size, and can be evenly dispersed in component A, and together with the silver powder arrangement aid, promotes the arrangement of silver particles, so that the paint film has excellent gloss.

[0037] The embodiment of the present invention also provides a method for preparing a two-component water-based silver powder solid color paint.

[0038] The preparation of component A comprises the following steps: Step 1: Add hydroxyl acrylic emulsion and waterborne polyurethane dispersion into the dispersion tank and stir evenly. During the stirring process of hydroxyl acrylic emulsion and waterborne polyurethane dispersion, slowly add wetting dispersant, film-forming aid, deionized water, defoaming agent, titanium dioxide, wetting and leveling agent, matting powder and thickener, and continue stirring until the fineness of the mixture is ≤30μm.

[0039] Step 2: Add a hand feel additive, a silver powder arrangement additive, a water-based aluminum silver paste, a water-based nano color paste, and deionized water into a dispersion tank, stir evenly, and filter to obtain component A.

[0040] The preparation of component B comprises the following steps: adding a dehydrating agent to a propylene glycol methyl ether acetate solution and dehydrating for 24 hours; then adding an aqueous hexamethylene diisocyanate (HDI) type homopolymer and stirring evenly to obtain component B; When the two-component water-based silver powder solid color paint is used, the component A and the component B are mixed at a mass ratio of 10:1, and deionized water is added to adjust the viscosity of the two-component water-based silver powder solid color paint.

[0041] Example 1 A method for preparing a two-component water-based silver powder solid color paint comprises the following steps: The preparation of component A includes the following steps: Step 1: Add 46 parts of hydroxyl acrylic emulsion and 25 parts of waterborne polyurethane dispersion into the dispersion tank and stir evenly at a stirring speed of 600-800 rpm for 5-8 minutes. While stirring the hydroxyl acrylic emulsion and waterborne polyurethane dispersion, slowly add 0.5 parts of wetting dispersant, 6 parts of film-forming aid solution (4 parts of film-forming aid and 2 parts of deionized water), 0.5 parts of defoamer, 4 parts of titanium dioxide, 0.3 parts of wetting and leveling agent, 3 parts of matting powder, and 0.6 parts of thickener. Continue stirring for 25-35 minutes until the fineness of the mixture is ≤30μm, and the stirring speed is 1500-1800 rpm.

[0042] Step 2: Add 2 parts of hand feel additive, 2 parts of silver powder arrangement additive, 6 parts of water-based aluminum silver paste, 1 part of water-based nano color paste, and 3.1 parts of deionized water into a dispersion tank, stir at a speed of 500-700 rpm for 5-10 minutes, and obtain component A after filtering.

[0043] The preparation of component B includes the following steps: adding 0.3 parts of a dehydrating agent to 20 parts of a propylene glycol methyl ether acetate solution, and dehydrating for 24 hours; then adding 79.7 parts of an aqueous hexamethylene diisocyanate (HDI) type homopolymer, stirring evenly, and filtering with a 300-mesh filter cloth to obtain component B.

[0044] Examples 2-4 The raw material formulas were changed according to Tables 1-2, and the components A and B of Examples 2-4 were prepared according to the preparation method of Example 1.

[0045] Table 1 is the formula of component A of Examples 1 to 4 Table 2 is the formula of component B of Examples 1 to 4 Table 3 shows the raw material numbers and sources of Examples 1 to 4 The component A of the above-prepared embodiments 1 to 4 and the component B of any of the embodiments 1 to 4 were mixed at a weight ratio of 10:1, and deionized water was added to prepare a two-component water-based silver powder solid color paint. The comparative example is the water-based two-component rose gold topcoat P816 of South China Tree Coatings. The paint bodies of the embodiments and comparative examples were subjected to harmful substance analysis and performance testing, and the test results are shown in the following table. In the following table, the embodiment n of the A component is abbreviated as An, and the embodiment n of the B component is abbreviated as Bn.

[0046] Table 4-1 shows the analysis results of harmful substances in the examples (An+Bn) and comparative examples. Table 4-2 shows the performance test results of the embodiment (An+Bn) and the comparative example Table 5-1 shows the analysis results of harmful substances in the examples (An+B1) and comparative examples. Table 5-2 is the performance test results of the embodiment (An+B1) and the comparative example Table 6-1 shows the test results of harmful substances in the examples (A1+Bn) and comparative examples. Table 6-2 is the performance test results of the embodiment (A1+Bn) and the comparative example The examples (A1+B1) and comparative examples in Tables 4 to 6 are the results of three solid color paint ratio tests. Some of the VOC test results from the first handover are retained here. The red words are the corresponding fine-tuned data based on the results of Table 4-1. Please check if there are any problems.

[0047] (1) It can be seen from the test data in Tables 4 to 6-1, 5-1, and 6-1 that the two-component water-based silver powder solid color paint of the present invention has a low content of harmful substances and complies with the national standard GB18581-2020.

[0048] (2) It can be seen from the test data in Tables 4-2, 5-2 and 6-2 that the two-component water-based silver powder solid color paint of the present invention has extremely small color difference after hot storage compared with the comparative example, and there is no obvious precipitation or floating color, and it has good stability. This is because the synergistic effect of the hydroxyl acrylic emulsion, water-based polyurethane dispersion and wetting dispersant makes the water-based aluminum silver paste, titanium dioxide and water-based nano-color paste stably and evenly dispersed in the paint body, improves the storage stability of the paint body, and prevents the silver particles of the aluminum silver paste, titanium dioxide and water-based nano-color paste from floating on the surface of the paint film.

[0049] (3) Moreover, the paint film formed by the two-component water-based silver powder solid color paint of the present invention has good weather resistance and acid and alkali resistance. In the hot and cold cycle test, it is not easy to crack or fall off, has good mechanical properties, and complies with the GB / T23999-2009 standard and the GB / T3324-2017 standard.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A two-component water-based silver powder solid color paint, characterized in that: It is composed of component A and component B, wherein the mass ratio of component A to component B is 10:1; The component A comprises the following raw materials in parts by weight: 40-55 parts of hydroxy acrylic emulsion, 25-35 parts of waterborne polyurethane dispersion, 0.5-1 parts of wetting dispersant, 2-6 parts of film-forming aid, 2-6 parts of deionized water, 0.1-0.5 parts of defoamer, 15-25 parts of titanium dioxide, 0.1-0.3 parts of wetting and leveling agent, 2-4 parts of matting powder, 0.5-1 parts of thickener, 1-3 parts of hand feel aid, 1-3 parts of silver powder arrangement aid, 4-8 parts of waterborne aluminum silver paste, and 0.5-3 parts of waterborne nano color paste; The B component comprises the following raw materials in parts by weight: 70-75 parts of water-based hexamethylene diisocyanate (HDI) homopolymer, 20-25 parts of propylene glycol methyl ether acetate, and 0.1-0.5 parts of a dehydrating agent; the water-based polyurethane dispersion can be dispersed in the hydroxylated acrylic emulsion and the B component.

2. A two-component water-based silver powder solid color paint according to claim 1, characterized in that: The mass content of non-volatile solids in the hydroxylated acrylic emulsion is 30% to 50%, the mass content of hydroxyl groups in the non-volatile solids is 1.6%, and the fineness of the hydroxylated acrylic emulsion is 1 to 15 μm.

3. A two-component water-based silver powder solid color paint according to claim 1, characterized in that: The mass content of solids in the aqueous polyurethane dispersion is 30% to 50%.

4. A two-component water-based silver powder solid color paint according to claim 1 or 3, characterized in that: The waterborne polyurethane dispersion is Lacper®4219 from Wanhua Chemical Group or S7601 from Zhanchen.

5. The two-component water-based silver powder solid color paint according to claim 1, characterized in that: The thickener is fumed silica.

6. A two-component water-based silver powder solid color paint according to claim 1, characterized in that: The matting agent includes an organic thermosetting polymethyl urea polymer.

7. The two-component water-based silver powder solid color paint according to claim 1, characterized in that: The hand feel aid comprises at least one of an organosilicon compound and a wax emulsion.

8. The two-component water-based silver powder solid color paint according to claim 1, characterized in that: The silver powder arrangement auxiliary agent is modified ethylene vinyl acetate copolymer wax emulsion and / or cellulose acetate butyrate.

9. The two-component water-based silver powder solid color paint according to claim 1, characterized in that: The wetting and leveling agent is an organic silicon surfactant.

10. A method for preparing a two-component water-based silver powder solid color paint according to any one of claims 1 to 9, characterized in that: The preparation of component A comprises the following steps: Step 1: Add hydroxyl acrylic emulsion and waterborne polyurethane dispersion into the dispersion tank and stir evenly. During the stirring process of hydroxyl acrylic emulsion and waterborne polyurethane dispersion, slowly add wetting dispersant, film-forming aid, deionized water, defoamer, titanium dioxide, wetting and leveling agent, matting powder and thickener, and continue stirring until the fineness of the mixture is ≤30μm; Step 2: Add a hand feel additive, a silver powder arrangement additive, a water-based aluminum silver paste, a water-based nano color paste, and deionized water into a dispersion tank, stir evenly, and filter to obtain component A; The preparation of component B comprises the following steps: adding a dehydrating agent to a propylene glycol methyl ether acetate solution and dehydrating for 24 hours; then adding an aqueous hexamethylene diisocyanate (HDI) type homopolymer and stirring evenly to obtain component B; When the two-component water-based silver powder solid color paint is used, the component A and the component B are mixed at a mass ratio of 10:1, and deionized water is added to adjust the viscosity of the two-component water-based silver powder solid color paint.

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