Waterborne polyurethane metallic iridescent paint, preparation method and application thereof

Abstract

The application discloses a water-based polyurethane metal color-shifting paint, and preparation raw materials include, in weight parts, 20-40 parts of acrylic acid dispersion, 25-45 parts of acrylic emulsion, 0.1-1 part of dispersant, 0.1-1 part of color-shifting powder, 5-15 parts of film-forming aid, 1-10 parts of color paint aid, and 15-30 parts of deionized water. The application reduces the cost of the two-component polyurethane metal color-shifting paint, improves the net profit of enterprises, solves the problem of particle formation caused by poor arrangement of color-shifting powder in the coating construction process, improves the construction efficiency, and improves the construction window without affecting the paint film state after spraying varnish on the surface.

Description

Technical Field

[0001] This invention relates to a waterborne polyurethane metallic iridescent paint, its preparation method, and its application, and relates to C09D, specifically to the field of coating compositions. Background Technology

[0002] Water-based polyurethane metallic paint can improve the fullness, color, and aesthetics of topcoats, thus enjoying widespread use in practical applications. However, the dispersion of metallic particles in the paint can affect the finish. Existing metallic paints are expensive to produce due to the high cost of particle agglomeration. Furthermore, existing metallic paints are slow to dry after application, and large particles can cause a rough surface. Therefore, developing a metallic paint that improves application efficiency, enhances finish, and reduces costs is crucial.

[0003] Chinese invention patent CN201510610300.6 discloses a method for preparing a water-based metallic glitter base coat. First, a water-based aluminum powder slurry is prepared, and then added to a resin liquid under low-speed stirring. During the preparation process, the base coat is free of lumps and mechanical impurities, and the paint film has a shiny silver appearance. After preparation, the paint film does not change color, but it does not contain iridescent powder and cannot achieve an iridescent effect. Chinese invention patent CN201210197381.8 discloses a negative ion eco-friendly iridescent paint and its preparation method. It uses a combination of nano-acrylic emulsion and pearl powder, which can reduce VOC and heavy metal content, resulting in rich colors and being environmentally friendly with a low pollution index. However, its application in indoor architecture results in higher costs. Summary of the Invention

[0004] In order to develop a colorful paint that improves construction efficiency, enhances construction effect, and reduces usage cost, the first aspect of the present invention provides a water-based polyurethane metallic colorful paint, the raw materials of which, by weight, include: 20-40 parts of acrylic dispersion, 25-45 parts of acrylic emulsion, 0.1-1 parts of dispersant, 0.1-1 parts of colorful powder, 5-15 parts of film-forming aid, 1-10 parts of paint additive, and 15-30 parts of deionized water.

[0005] In a preferred embodiment, the raw materials for preparation include, by weight: 25-35 parts of acrylic dispersion, 30-40 parts of acrylic emulsion, 0.3-0.8 parts of dispersant, 0.5-1 parts of chroma powder, 8-12 parts of film-forming aid, 3-8 parts of paint additive, and 20-25 parts of deionized water.

[0006] In a preferred embodiment, the raw materials for preparation include, by weight: 30 parts acrylic dispersion, 35 parts acrylic emulsion, 1 part dispersant, 0.5 parts chroma powder, 9 parts film-forming aid, 6 parts paint additive, and 18.5 parts deionized water.

[0007] In a preferred embodiment, the acrylic dispersion has a viscosity of 20-500 mPa·s at 25°C, a hydroxyl content of 2-3 wt%, and a solid content of 43-48 wt%.

[0008] In a preferred embodiment, the acrylic dispersion has a viscosity of 20-500 mPa·s at 25°C, a hydroxyl content of 2.2 wt%, and a solid content of 45 wt%.

[0009] In a preferred embodiment, the acrylic emulsion has an acid value of 3.5-5.2 mgKOH / g, a solid content of 20-30 wt%, and a viscosity of 50-80 Pa·s at 25°C.

[0010] In a preferred embodiment, the acrylic emulsion has an acid value of 3.5-5.2 mgKOH / g, a solid content of 22-26 wt%, and a viscosity of 50-80 Pa·s at 25°C.

[0011] In a preferred embodiment, the paint additives include at least one of defoamers, wetting agents, orienting agents, thickeners, and acid-base neutralizers.

[0012] In a preferred embodiment, the paint additives include, by weight, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting agent, 2-8 parts of orienting agent, 0.1-0.5 parts of thickener, and 0.1-0.4 parts of acid-base neutralizer.

[0013] In a preferred embodiment, the paint additives include, by weight, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting agent, 4-7 parts of orienting agent, 0.2-0.4 parts of thickener, and 0.1-0.2 parts of acid-base neutralizer.

[0014] In a preferred embodiment, the paint additives include, by weight, 0.2 parts of defoamer, 0.3 parts of wetting agent, 5 parts of orientation agent, 0.3 parts of thickener, and 0.2 parts of acid-base neutralizer.

[0015] In a preferred embodiment, the defoamer includes, but is not limited to, alcohols, fatty acids, fatty acid esters, phosphate esters, mineral oils, amides, polyether-type, and silicone-type defoamers.

[0016] In a preferred embodiment, the wetting agent includes, but is not limited to, fatty alcohol sulfate wetting agents, sulfonate wetting agents, carboxylic acid soap wetting agents, phosphate ester wetting agents, fatty alcohol polyoxyethylene ether sulfate wetting agents, polyoxyethylene alkylphenol ether wetting agents, and polyoxyethylene fatty secondary alcohol ether wetting agents.

[0017] In a preferred embodiment, the thickener includes, but is not limited to, inorganic salt thickeners, cellulose thickeners, polyacrylic acid thickeners, polyurethane thickeners, natural gum thickeners, polyoxyethylene thickeners, and associative thickeners.

[0018] In a preferred embodiment, the acid-base neutralizing agent includes, but is not limited to, triethylenediamine, N,N-dimethylethanolamine, and dimethylmethoxypropylamine.

[0019] In a preferred embodiment, the orientation agent is a silver powder orientation agent, and the active ingredient content in the silver powder orientation agent is 15-30 wt%.

[0020] In a preferred embodiment, the active ingredient of the silver powder orientation agent is a modified EVA wax emulsion, and the content of the active ingredient in the silver powder orientation agent is 20wt%.

[0021] In a preferred embodiment, the film-forming aid includes at least one of dipropylene glycol butyl ether (DPNB), propylene glycol methyl ether (PM), and dipropylene glycol methyl ether (DPM).

[0022] In a preferred embodiment, the film-forming aid comprises dipropylene glycol butyl ether and propylene glycol methyl ether, wherein the weight ratio of dipropylene glycol butyl ether to propylene glycol methyl ether is (1-5):(5-8).

[0023] In a preferred embodiment, the weight ratio of dipropylene glycol butyl ether to propylene glycol methyl ether is 3:6.

[0024] In a preferred embodiment, the particle size of the iridescent powder is 100-200 μm.

[0025] In a preferred embodiment, the particle size of the iridescent powder is 150 μm.

[0026] During the experiment, the applicant discovered that a combination of acrylic emulsion and acrylic dispersion, with the addition of iridescent powder and directional silver powder, resulted in a metallic iridescent paint that could be sprayed in a directional manner. This metallic iridescent paint exhibited rapid drying, fine particle size of the iridescent powder, and excellent application results. The likely reason is that the acrylic dispersion used in the metallic iridescent paint has a hydroxyl content of 2-3 wt% and a viscosity of 20-500 mPa·s, which allows it to interact with the directional silver powder. This results in a metallic iridescent paint that can be sprayed in a directional manner. The surface hydroxyl groups of the iridescent powder and directional silver powder interact with the 2-3 wt% hydroxyl content of the acrylic dispersion, forming a directional metallic iridescent paint spray. The powder particles are oriented within the paint, resulting in a smooth and even paint film. Furthermore, the added silver powder, with a particle size of 150 μm, contributes to the fine and smooth texture of the paint surface.

[0027] Furthermore, using an acrylic emulsion and acrylic dispersion in a weight ratio of (30-40):(25-35) allows the iridescent powder and silver powder to be evenly dispersed in the resin. The iridescent powder and silver powder are oriented, with inconspicuous surface particles and a smooth paint film surface. This may be because the acrylic emulsion with an acid value of 3.5-5.2 is used in combination with the acrylic dispersion, which promotes the uniform arrangement of powder, reduces iridescent particles on the surface, improves color, and ensures that the composite coating passes the pull-out test.

[0028] A second aspect of the present invention provides a method for preparing a waterborne polyurethane metallic iridescent paint, comprising the following steps:

[0029] S1 acrylic dispersion and acrylic emulsion are mixed and stirred;

[0030] Add film-forming aid, color powder, and dispersant to S2 at a speed of 200-500 r / min, and stir for 15-20 min;

[0031] S3 is then added to the orientation agent and dispersed for 3-8 minutes, followed by the slow addition of the thickener to obtain the mixture;

[0032] After mixing S4 acid-base neutralizing agent and deionized water, slowly add it to the mixture and stir for 13-18 minutes;

[0033] Add defoamer and wetting agent to S5 and stir at 200-500 rpm for 15-30 minutes to obtain the final product.

[0034] The third aspect of the present invention provides a method for applying a waterborne polyurethane metallic iridescent paint, wherein the prepared waterborne polyurethane metallic iridescent paint is mixed with a curing composition and then used.

[0035] In a preferred embodiment, the weight ratio of the waterborne polyurethane metallic iridescent paint to the curing composition is (8-12):1.

[0036] In a preferred embodiment, the weight ratio of the waterborne polyurethane metallic iridescent paint to the curing composition is 10:1.

[0037] In a preferred embodiment, the curing composition comprises an isocyanate curing agent, propylene glycol methyl ether acetate, and propylene glycol diacetate. The weight ratio of the isocyanate curing agent, propylene glycol methyl ether acetate, and propylene glycol diacetate is (60-80):(10-20):(10-20).

[0038] In a preferred embodiment, the weight ratio of the isocyanate curing agent, propylene glycol methyl ether acetate, and propylene glycol diacetate is 70:15:15.

[0039] In a preferred embodiment, the curing composition is prepared by adding an isocyanate curing agent, adding propylene glycol methyl ether acetate and propylene glycol diacetate at a stirring speed of 200-500 r / min, and continuing to stir for 3-5 min to obtain the curing composition.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The water-based polyurethane metallic iridescent paint of the present invention uses a combination of acrylic emulsion and acrylic dispersion, and adds iridescent powder and directional silver powder. The resulting metallic iridescent paint can be sprayed in a directional manner. The resulting metallic iridescent paint has a fast spray drying speed, fine iridescent powder particle size, and excellent construction effect.

[0042] (2) The waterborne polyurethane metallic iridescent paint of the present invention uses an acrylic emulsion and an acrylic dispersion in a weight ratio of (30-40): (25-35), which can make the iridescent powder and silver powder uniformly dispersed in the resin, and the iridescent powder and silver powder are oriented and arranged in a direction, with inconspicuous surface particles and a smooth paint film surface.

[0043] (3) The water-based polyurethane metallic iridescent paint of the present invention reduces the cost of two-component polyurethane metallic iridescent paint, increases the net profit of enterprises, solves the problem of particle formation caused by poor arrangement of iridescent powder during the coating construction process, improves construction efficiency, enhances the construction window, and does not affect the paint film state after spraying clear varnish.

[0044] (4) The water-based polyurethane metallic iridescent paint of the present invention has good iridescent powder orientation, fast drying, smooth paint film, and exhibits iridescent diversity.

[0045] (5) The water-based polyurethane metallic iridescent paint of the present invention is easy for workers to apply, the paint film is stable, the iridescent effect is good, the arrangement and leveling are neat, the clear varnish coating is smooth, the workers' application efficiency is high, and it is green and environmentally friendly. Attached Figure Description

[0046] Figure 1 The image shows the effect of spraying clear varnish onto the waterborne polyurethane metallic iridescent paint prepared in Example 3.

[0047] Figure 2 The image shows the effect of spraying clear varnish onto the waterborne polyurethane metallic iridescent paint prepared in Comparative Example 1. Detailed Implementation

[0048] Implementation 1

[0049] A water-based polyurethane metallic iridescent paint, the raw materials for which are prepared are detailed in Table 1 below by weight:

[0050] Table 1

[0051]

[0052] The acrylic emulsion is designated as SETAQUA 6802 resin from ZHANXIN, with an acid value of 3.5-5.2 mgKOH / g, a solid content of 22-26 wt%, and a viscosity of 50-80 Pa·s at 25°C.

[0053] The acrylic dispersion is designated as Fuqisen Resin AQUAPAC8222, with a viscosity of 20-500 mPa·s at 25°C, a hydroxyl content of 2.2 wt%, and a solid content of 45 wt%.

[0054] The orientation agent is a silver powder orientation agent, and the active ingredient is a modified EVA wax emulsion. The active ingredient content in the silver powder orientation agent is 20 wt%.

[0055] The particle size of the iridescent powder is 150 μm.

[0056] A method for preparing a water-based polyurethane metallic iridescent paint includes the following steps:

[0057] S1 acrylic dispersion and acrylic emulsion are mixed and stirred;

[0058] S2 is added to film-forming aid, color powder, and dispersant at a speed of 300 r / min, and stirred for 20 min;

[0059] S3 is then added and dispersed for 5 minutes, followed by slow addition of the thickener to obtain the mixture;

[0060] After mixing S4 acid-base neutralizing agent and deionized water, slowly add it to the mixture and stir for 15 minutes;

[0061] Add defoamer and wetting agent to S5 and stir at 400 rpm for 30 minutes to obtain the final product.

[0062] The application method of the waterborne polyurethane metallic iridescent paint is as follows: after mixing the prepared waterborne polyurethane metallic iridescent paint with the curing composition, it can be used.

[0063] The weight ratio of the waterborne polyurethane metallic iridescent paint to the cured composition is 10:1.

[0064] The curing composition comprises isocyanate curing agent, propylene glycol methyl ether acetate, and propylene glycol diacetate in a weight ratio of 70:15:15.

[0065] The isocyanate curing agent is BAYHYDUR XP 2655 curing agent.

[0066] The curing composition is prepared by adding isocyanate curing agent, adding propylene glycol methyl ether acetate and propylene glycol diacetate at a stirring speed of 400 r / min, and continuing to stir for 5 min to obtain the curing composition.

[0067] Experiment 2

[0068] A water-based polyurethane metallic iridescent paint, the raw materials for which are prepared, by weight, are detailed in Table 2 below:

[0069] Table 2

[0070]

[0071] The acrylic emulsion is designated as SETAQUA 6802 resin from ZHANXIN, with an acid value of 3.5-5.2 mgKOH / g, a solid content of 22-26 wt%, and a viscosity of 50-80 Pa·s at 25°C.

[0072] The acrylic dispersion is designated AQUAPAC 8230, with a viscosity of 500-450 mPa·s at 25°C, a hydroxyl content of 2.9 wt%, and a solid content of 45 wt%.

[0073] The other raw materials used in the preparation are the same as those in Experiment 1.

[0074] The preparation method of a water-based polyurethane metallic iridescent paint is the same as in Experiment 1.

[0075] Experiment 3

[0076] A water-based polyurethane metallic iridescent paint, the raw materials for which are prepared are detailed in Table 3 below by weight:

[0077] Table 3

[0078]

[0079] The acrylic emulsion is designated as SETAQUA 6802 resin from ZHANXIN, with an acid value of 3.5-5.2 mgKOH / g, a solid content of 22-26 wt%, and a viscosity of 50-80 Pa·s at 25°C.

[0080] The acrylic dispersion is designated as LianGu Chemical 2135F, with a viscosity of 500-3000 mPa·s at 25°C, a hydroxyl content of 2.5 wt%, and a solid content of 45 wt%.

[0081] The other raw materials used in the preparation are the same as those in Experiment 1.

[0082] The preparation method of a water-based polyurethane metallic iridescent paint is the same as in Experiment 1.

[0083] Experiment 4

[0084] A water-based polyurethane metallic iridescent paint, the raw materials for which are prepared are detailed in Table 4 below by weight:

[0085] Table 4

[0086]

[0087] The acrylic emulsion grade is Zahn Chemie SETAQUA 6802, with an acid value of 3.5 - 5.2 mg KOH / g, a solid content of 22 - 26 wt%, and a viscosity of 50 - 80 Pa·s at 25°C.

[0088] The acrylic dispersion grade is Huaguoshan 5032C, with a viscosity of 50 - 6000 cps at 25°C, a hydroxyl content of 3.2 wt%, and a solid content of 42 wt%.

[0089] The types of the remaining preparation raw materials are the same as those in Experiment 1.

[0090] The preparation method of a waterborne polyurethane metallic multicolor paint is the same as that in Experiment 1.

[0091] Performance Testing

[0092] 1. Pull-off test: Referring to the method of GB / T 5210, the pull-off performance of the prepared multicolor paint is tested. Adhesion ≥ 5 MPa is judged as qualified.

[0093] 2. Glossiness test: Referring to the method of GB / T 1743 Determination of Film Glossiness, the glossiness of the prepared multicolor paint is tested.

[0094] After mixing the waterborne polyurethane metallic multicolor paints prepared in Example 3 and Comparative Example 1 with the curing composition, spraying is carried out, and then clear varnish is sprayed. After drying and curing, photos are taken as shown in Figure 1 and Figure 2 .

[0095] The preparation steps of the clear varnish are as follows: Add 80 parts by weight of resin (DIC WD - 570), start stirring, and add 1 part by weight of BYK - 190 dispersant, 0.5 part by weight of BYK - 028 defoamer, and 0.5 part by weight of Degussa 4100 wetting agent at a rotation speed of 200 - 500 r / min. Continue to add 3 parts by weight of pre-mixed DPM, 4.5 parts by weight of DPNB, and 5 parts by weight of water at a rotation speed of 200 - 500 r / min, and stir for 9 min. Then add 0.3 part by weight of Borchi Gel 0620 thickener, 0.2 part by weight of acid-base neutralizer A - 33, and 5 parts by weight of water, and stir at a rotation speed of 200 - 500 r / min for 9 min to obtain the clear varnish.

[0096] The clear varnish curing agent is obtained by mixing 70 parts by weight of BAYHYDUR XP 2655 curing agent, 15 parts by weight of propylene glycol methyl ether acetate, and 15 parts by weight of propylene glycol diacetate.

[0097] The clear varnish and the clear varnish curing agent can be used after being compounded at a weight ratio of 3:1.

[0098] The performance test results are shown in Table 5.

[0099] Table 5

[0100]

Claims

1. A water-based polyurethane metallic iridescent paint, characterized in that, The raw materials for preparation include, by weight: 25-35 parts of acrylic dispersion, 30-40 parts of acrylic emulsion, 0.3-0.8 parts of dispersant, 0.5-1 parts of chroma powder, 8-12 parts of film-forming aid, 3-8 parts of paint additive, and 20-25 parts of deionized water; The acrylic dispersion has a viscosity of 20-500 mPa·s at 25°C, a hydroxyl content of 2.2 wt%, and a solid content of 45 wt%. The acrylic emulsion has an acid value of 3.5-5.2 mgKOH / g, a solid content of 20-30 wt%, and a viscosity of 50-80 Pa·s at 25°C. The film-forming aid includes dipropylene glycol butyl ether and propylene glycol methyl ether, wherein the weight ratio of dipropylene glycol butyl ether to propylene glycol methyl ether is 3:6; The paint additives, by weight, include 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting agent, 2-8 parts of orientation agent, 0.1-0.5 parts of thickener, and 0.1-0.4 parts of acid-base neutralizer; The orientation agent is a silver powder orientation agent, and the active ingredient content in the silver powder orientation agent is 15-30 wt%. The active ingredient in the silver powder orientation agent is a modified EVA wax emulsion.

2. The waterborne polyurethane metallic iridescent paint according to claim 1, characterized in that, The particle size of the iridescent powder is 100-200μm.

3. A method for preparing the waterborne polyurethane metallic iridescent paint according to claim 1, characterized in that, Includes the following steps: S1: Mix the acrylic dispersion and acrylic emulsion, and stir. S2: Add film-forming aid, color powder, and dispersant at a speed of 200-500 r / min, and stir for 15-20 min; S3: Then add the orientation agent and disperse for 3-8 minutes, then slowly add the thickener to obtain the mixture; S4: After mixing the acid-base neutralizing agent and deionized water, slowly add it to the mixture and stir for 13-18 minutes; S5: Add defoamer and wetting agent, stir at 200-500 rpm for 15-30 minutes, and you will get the product.

4. A method for applying the waterborne polyurethane metallic iridescent paint according to claim 1, characterized in that, The prepared waterborne polyurethane metallic iridescent paint can be used after being mixed with the curing composition.

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