A quick-drying wear-resistant water-based two-component polyurethane base-one dull paint, a preparation method and applications thereof

Abstract

The application provides a quick-drying wear-resistant water-based two-component polyurethane one-coat matte paint, a preparation method and application thereof. The one-coat matte paint comprises an A component and a B component, wherein the A component comprises a low-hydroxyl water-based hydroxyl acrylic polyurethane dispersion, a high-molecular-weight / moderate-Tg / medium-high-hydroxyl water-based hydroxyl acrylic dispersion, a flatting powder, a water-based additive, a film-forming additive and water; the B component comprises a water-based isocyanate curing agent and a dilution solvent. The one-coat matte paint has the properties of low-temperature quick drying and wear resistance, and has excellent multi-substrate adhesion, chemical resistance, workability, activation period and surface effect, and is suitable for a water-based two-component low-temperature quick-drying wear-resistant one-coat matte system, and is particularly suitable for decoration and protection in the plastic paint industry.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coatings, and particularly relates to a quick-drying wear-resistant water-based two-component polyurethane one-coat matte paint, a preparation method and application thereof. BACKGROUND

[0002] The matte paint brings a different visual experience from the conventional high-gloss paint due to its matte characteristics, and is increasingly favored by consumers. It has been widely used in the consumer electronics, wearable devices, automobile industry and electric vehicle market.

[0003] The coating of traditional consumer electronics is mainly a multi-layer system, and the construction method is complex, time-consuming and labor-intensive, and the VOC emission is high. Therefore, it is urgent to develop a wear-resistant, low-temperature quick-drying water-based two-component polyurethane one-coat matte paint.

[0004] The base materials (PC / PC+ABS / ABS, etc.) in the plastic paint industry cannot withstand medium-high temperature baking, and are generally baked at 60°C or below for 20-30 minutes. However, most water-based two-component polyurethanes need to be cross-linked at medium-high temperature (above 60°C) to provide some performance, so as to facilitate offline and stacking. This makes most water-based two-component polyurethanes have poor adhesion on plastic base materials. In addition, most water-based acrylic polyurethane two-component paints need to use a large amount of matting powder for matting when used as matte paint, which results in poor wear resistance and poor chemical resistance of the paint film, affecting the appearance and durability of the paint film. In view of the above problems, there is an urgent need for a low-temperature quick-drying, wear-resistant water-based two-component polyurethane one-coat matte paint to reduce the baking temperature and improve the durability of the paint film.

[0005] CN 115651520 A discloses a high-hardness, high-wear-resistance, quick-drying water-based automobile finish paint and a preparation method thereof. The prepared automobile finish paint has the characteristics of high hardness, high wear resistance and quick drying, and also has good weather resistance and low VOC performance. However, the paint needs to be compounded with water-based silica sol, nano-alumina, graphene ceramic crystal and other raw materials to improve the hardness and wear resistance, and a drying speed improving agent and a cross-linking agent are used to improve the drying speed. The formula is complex and multiple additives (water-based silica sol, nano-alumina, graphene ceramic crystal, drying speed improving agent and cross-linking agent) are used, which is prone to demulsification and compatibility problems, and the performance is unstable.

[0006] CN 106047139 A discloses an environmentally friendly wear-resistant two-component plastic paint and a preparation method thereof. The prepared paint film has good environmental friendliness and good wear resistance. However, the styrene-modified alkyd resin component is used in the patent. First, this component will undergo hydrolysis reaction at room temperature, and the paint stability is insufficient. Second, although styrene-modified alkyd is used, its drying speed is much lower than that of acrylic resin, which ultimately leads to poor paint stability, poor drying speed, poor wear resistance and poor weather resistance.

[0007] CN105399914A discloses "a wear-resistant matte polyurethane varnish and a preparation method thereof", the prepared paint film solves the problems of outdoor damage and wear resistance, but the patent uses a, b and c three resins, the particle size difference between the c resin and the a and b resins is large, and the compatibility is unstable, and a large amount of solvent is used in the system, which does not meet the industry development and future trend. SUMMARY

[0008] Therefore, aiming at the existing technology (multi-coating system) of plastic paint, the future development trend (low energy consumption, one bottom) and the industry problems encountered in the water transfer process (wear resistance, matte stability), the purpose of the present application is to provide a low-temperature fast-drying, wear-resistant water-based two-component polyurethane one bottom matte paint, which only needs to be coated with a single coating on the substrate to meet the decoration and protection of the original coating system, is convenient to use, has excellent drying speed (50℃ 20min offline), wear resistance, adhesion and chemical resistance, and can effectively speed up the water transfer process and the "low-carbon" green development of the industry.

[0009] Another purpose of the present application is to provide a preparation method of the low-temperature fast-drying, wear-resistant water-based two-component polyurethane one bottom matte paint.

[0010] Still another purpose of the present application is to provide an application of the low-temperature fast-drying, wear-resistant water-based two-component polyurethane one bottom matte paint.

[0011] In order to achieve the above purposes, the technical solution of the present application is as follows:

[0012] A kind of fast-drying wear-resistant water-based two-component polyurethane one bottom matte paint, comprising the following components:

[0013] Component A: based on the total mass of component A, comprising the following mass percentage components:

[0014] Water-based hydroxyl acrylic polyurethane dispersion 40-80%, for example, including but not limited to 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, preferably 50-75%;

[0015] Water-based hydroxyl acrylic dispersion 5-35%, for example, including but not limited to 5%, 10%, 15%, 20%, 25%, 30%, 35%, preferably 10-30%;

[0016] Matte powder 4-12%, for example, including but not limited to 4%, 4.5%, 5%, 5.5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, preferably 5-10%;

[0017] Water 1-10%, for example including but not limited to 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 7%, 8%, 9%, 10%, preferably 2-8%;

[0018] Aqueous co-agent 0.5-2.5%, for example including but not limited to 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.5%, preferably 0.7-2%;

[0019] Film forming aid 0.5-2%, for example including but not limited to 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, preferably 0.5-1.5%;

[0020] B component: including the following mass percentage of components based on the total mass of the B component:

[0021] Aqueous isocyanate curing agent 65-85%, for example including but not limited to 65%, 70%, 75%, 80%, 85%, preferably 70-80%;

[0022] Open diluent 15-35%, for example including but not limited to 15%, 20%, 25%, 30%, 35%, preferably 20-30%;

[0023] Wherein the mass ratio of the A component and the B component is 6-10:1, for example including but not limited to 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, 10:1.

[0024] In one specific embodiment, the aqueous hydroxyl dispersion is an aqueous hydroxyl acrylate polyurethane dispersion with core-shell structure, the minimum film formation temperature MFFT is 20-50°C (for example 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, etc.), the acid value is 10-30 mgKOH / g (for example 10 mgKOH / g, 15 mgKOH / g, 20 mgKOH / g, 25 mgKOH / g, 30 mgKOH / g, etc.), the solid content is 35-50 wt% (for example 35%, 40%, 45%, 50%, etc.), and the hydroxyl content is 1.2-2.2% (for example 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2.0%, 2.2%, etc., mass content).

[0025] In one preferred embodiment, the aqueous hydroxyl acrylate polyurethane dispersion is selected from one or more of Sancure® 4288, Sancure® 4233, Sancure® 6510.

[0026] In the present application, the aqueous hydroxyl acrylate polyurethane dispersion (also called aqueous hydroxyl polyurethane acrylate dispersion) has a molecular weight much greater than that of the hydroxyl acrylate resin, which is beneficial to stress release in the extinction and crosslinking process of the system, and is beneficial to adhesion and gloss stability, and is beneficial to final scratch resistance and drying speed; secondly, the hydroxyl groups in the aqueous hydroxyl acrylate polyurethane dispersion are all distributed on the polyurethane segment, and the crosslinking density is more sufficient under the premise of not affecting the adhesion in the crosslinking process, the drying speed is faster, and the final paint film resistance is better.

[0027] Compared with the conventional hydroxyl polyurethane dispersion (OH-PUD), the aqueous hydroxyl acrylate polyurethane dispersion has a small OH-PUD resin molecular weight, poor low-temperature drying property, and needs to add a drying agent and other additives to improve the film drying speed, but will affect the activation period; secondly, the OH-PUD resin has poor extinction efficiency, needs to add a large amount of extinction powder for extinction, and the final paint film has a porous structure and low crosslinking density, and has many defects in application, such as poor wear resistance, poor chemical resistance, and difficulty in recoating.

[0028] The aqueous hydroxyl acrylate polyurethane dispersion of the present application contains more internal crosslinking and self-crosslinking, and has an interpenetrating network structure between PU / PA, and does not have compatibility problems with other hydroxyl-containing resins (hydroxyl acrylate, hydroxyl polyurethane, and hydroxyl polyol), can balance the rigidity and flexibility of the final paint film, and due to the large molecular weight, it is easy to obtain low gloss, which is beneficial to the adhesion of the paint film and the dullness of the appearance of the paint film.

[0029] The aqueous hydroxyl polyurethane acrylate dispersion of the present application contains one or more of 4288, 4233, 6510 of Wanhua Chemical, which can be comparable to the drying speed and hardness establishment of oil-based resins, good flexibility, and can ensure excellent appearance, resistance, curing agent compatibility and activation period during use. In addition, the aqueous hydroxyl polyurethane acrylate dispersion resin of the present application has a low film forming temperature, and the resin itself does not contain solvent, which is beneficial to reducing the VOC of the system.

[0030] In one embodiment, the aqueous hydroxyl acrylic dispersion is an aqueous hydroxyl acrylic dispersion having a core-shell structure, a glass transition temperature Tg of 50-70°C (e.g., 50°C, 55°C, 60°C, 65°C, 70°C, etc.), an acid value of 26-45 mgKOH / g (e.g., 26 mgKOH / g, 30 mgKOH / g, 35 mgKOH / g, 40 mgKOH / g, 45 mgKOH / g, etc.), a molecular weight Mw = 20,000-50,000 g / mol (e.g., 20,000 g / mol, 25,000 g / mol, 30,000 g / mol, 35,000 g / mol, 40,000 g / mol, 45,000 g / mol, 50,000 g / mol, etc.), a solid content of 35-50 wt% (e.g., 35%, 40%, 45%, 50%, etc.), and a hydroxyl content of 3.0-4.2% (e.g., 3%, 3.2%, 3.5%, 3.6%, 3.8%, 4.0%, 4.2%, etc., by mass).

[0031] In one preferred embodiment, the aqueous hydroxyl acrylic dispersion comprises one or more of Sancure® 2032B, Sancure® 2042, Sancure® 2706, and Sancure® A2770 from Lubrizol. 2032B, 2042, 2706, and Sancure® A2770 from Lubrizol.

[0032] In one embodiment, the aqueous isocyanate curing agent is a sulfonate-modified HDI trimer, such as one or more of Bayhydur® 268, Bayhydur® 270, and Bayhydur® 278 from Covestro. 268, 270, 278 from Covestro.

[0033] The aqueous isocyanate curing agent of the present application has good hand-mixing properties, low viscosity, good transparency, excellent water dispersibility, excellent early resistance and hardness build, excellent compatibility and resistance, can ensure the hardness, resistance of the paint film, and controllable reaction speed of the hydroxyl acrylic dispersion and avoid the occurrence of side reactions, etc.

[0034] In one embodiment, the diluent solvent is one or more of ethylene glycol butyl ether acetate, propylene glycol diacetate, and propylene glycol methyl ether acetate.

[0035] In one embodiment, the film-forming aid is one or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, and dipropylene glycol dimethyl ether.

[0036] In one embodiment, the matting powder is any one of DKS E1011 and Grilon SY7000.

[0037] ​In one specific embodiment, the aqueous auxiliary agent includes common wetting agents, defoaming agents, neutralizing agents, thickening agents, etc., but is not limited thereto, and one skilled in the art can select the corresponding auxiliary agent according to the performance needs of the matte paint, which is well known to one skilled in the art. For example, the wetting agent is selected from Tego 270, Tego KL 245, BYK 346, etc., the defoaming agent is selected from Tego 902W, TEGO Foamex 825, TEGO 1488, etc., the thickening agent is selected from Wanhua U505, U905, U605, etc., and the neutralizing agent is selected from DEMA, AMP95, etc. The amount of each auxiliary agent added is not particularly limited, for example, referring to the conventional amount added in the art, for example, 0.10-1.0%, etc.

[0038] In another aspect of the present application, a preparation method of the above-mentioned low-temperature fast-drying, wear-resistant water-based two-component polyurethane base-in-one matte paint is provided, comprising the following steps:

[0039] (1) uniformly mixing the water-based hydroxyl acrylate polyurethane dispersion, the water-based hydroxyl acrylate dispersion, the flatting powder, water, the water-based auxiliary agent, and the film-forming auxiliary agent, and filtering to obtain component A;

[0040] (2) uniformly mixing the water-based isocyanate curing agent and the diluting solvent, and obtaining component B;

[0041] (3) mixing components A and B according to the metering ratio, adding water, adjusting the Zahn-3 cup viscosity to 15-20 s, and filtering to obtain the water-based two-component polyurethane base-in-one matte paint.

[0042] The low-temperature fast-drying, wear-resistant water-based two-component polyurethane base-in-one matte paint provided by the present application has the following beneficial effects:

[0043] 1) The present application uses the water-based hydroxyl polyurethane acrylate dispersion with a core-shell structure and a low hydroxyl content, which has excellent multi-substrate adhesion, fast drying speed, high flatting efficiency, high hardness, good wear resistance, etc., thereby avoiding the problems of unstable gloss, slow drying speed, high VOC, adhesion, etc. caused by the use of hydroxyl polyurethane and hydroxyl acrylate, and avoiding the problems of poor resistance and poor wear resistance caused by the use of polyurethane and acrylate.

[0044] 2) The present application uses the water-based hydroxyl acrylate dispersion with a core-shell structure, a high Tg, and a high molecular weight and a medium-high hydroxyl content, which has extremely high hardness and toughness, chemical resistance, wear resistance, finger pressure drying speed, etc., thereby further improving the wear resistance and chemical resistance of the paint film.

[0045] 3) The present application utilizes the structural design and specific matching of hydroxyl polyurethane acrylic dispersions with low to medium hydroxyl content and hydroxyl acrylic secondary dispersions with medium to high hydroxyl content, and the use of specific hydrophilic isocyanate curing agents to obtain paint films with excellent comprehensive performance such as good offline speed, good multi-substrate adhesion, wear resistance, matt efficiency, etc., which can greatly reduce energy consumption and improve construction efficiency. DETAILED DESCRIPTION

[0046] The present application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the present application, and all other examples obtained based on the general concept of the examples in the present application without creative invention belong to the protection scope of the present application.

[0047] <TEST METHODS>

[0048] Adhesion: Use an adhesion grating to form about 100 grids of 1mm x 1mm size on the paint film, adhere the grids with an adhesion tape, then peel off the tape, and observe the paint film peeling, ≥4B.

[0049] Pencil hardness: Install different hardness pencils on a pencil hardness machine, gently place them on the surface to be tested, and advance at a speed of 5-10cm / s, and observe whether the sample surface is scratched.

[0050] Drying speed: At a dry film of 15±3um, level at room temperature for 3min, take out from a 50℃ oven after 20min, and after cooling to room temperature, press with a finger, and the paint film surface does not leave fingerprints.

[0051] Water resistance: Soak the paint film in 85℃ water for 30min / 2h, the paint film does not bubble, does not discolor, does not lose gloss, ΔE≤1.0, adhesion does not decrease, ≥4B.

[0052] High temperature and humidity resistance: Place the paint film in 50℃, RH95% for 10d, the paint film does not bubble, does not wrinkle, allows slight gloss loss, discoloration, ΔE≤1.0, adhesion does not decrease, ≥4B.

[0053] RCA resistance test: Place the paint film on the RCA instrument, test under 175g force, and observe the number of times the paint film does not wear through, ≥80 times.

[0054] Chemical resistance test: Use a cotton gauze soaked with a specified solvent, and use a 500g weight to rub back and forth on the tested substrate, and observe the number of times the substrate paint film is damaged.

[0055] Gloss stability: Place the prepared A component at 50℃ for 14d, then add the B component, and measure the difference in gloss before and after, ≤3%.

[0056] Example 1

[0057] Paint component A is prepared according to the following formulation, and the specific gravity of the following is weight percentage.

[0058] Code Substance Specific Gravity Classification Supplier 1 Lacper 4288 45.00 Hydroxyl Acrylic Polyurethane Dow Chemical 2 Antkote 2706 35.00 Hydroxyl Acrylic Acid Dow Chemical 3 Water 5.70 / / 4 E1011 11.00 Flatting Powder Dow Corning 5 DPM 1.00 Coalescing Agent Dow 6 DPNB 0.50 Coalescing Agent Dow 7 TEGO 270 0.35 Wetting Agent Tego 8 TEGO 902w 0.10 Defoamer Tego 9 U505(50％) 0.70 Thickener Dow Chemical 10 U905(50％) 0.50 Thickener Dow Chemical 11 DMEA (10%) 0.15 Neutralizer Dow

[0059] B component includes isocyanate curing agent 268 70%, dilution solvent propylene glycol methyl ether acetate PMA 30%.

[0060] Component A: component B mass ratio = 6:1.

[0061] The preparation method of the two-component polyurethane base one flat matte paint includes the following steps: first, the hydroxyl acrylate dispersion / hydroxyl acrylate polyurethane is added to a container, the dispersion speed is adjusted to 800 r / min, and stirring is performed for 20 min, then the film forming aid, defoaming agent, substrate wetting agent, neutralizing agent, thickening agent are added, and after the addition is completed, the dispersion speed is maintained unchanged and the dispersion is continued for 20 min, then the matt powder is added in proportion, 800 r / min stirring is performed for 30 min, and 325 mesh filter screen is used for filtering to obtain component A. The curing agent in component B is diluted with dilution solvent. According to the designed ratio, the metered components A and B are mixed, deionized water is added, and the Zahn-3 cup viscosity is adjusted to about 15 s to obtain a water-based two-component polyurethane base one flat matte paint, which can be used for spraying.

[0062] Example 2

[0063] Paint component A is prepared according to the following formulation, and the specific gravity of the following is weight percentage.

[0064] Code Substance Specific Gravity Classification Supplier 1 Crysol 6510 75.00 Hydroxyl Acrylic Polyurethane Dow Chemical 2 Antkote 2032B 7.00 Hydroxyl Acrylic Acid Dow Chemical 3 Water 9.70 / / 4 E1011 5.00 Flatting Powder Dow Corning 5 DPM 1.00 Coalescing Agent Dow 6 DPNB 0.50 Coalescing Agent Dow 7 TEGO 270 0.35 Wetting Agent Tego 8 TEGO 1488 0.10 Defoamer Tego 9 U505(50％) 1.00 Thickener Dow Chemical 10 U905(50％) 0.30 Thickener Dow Chemical 11 DMEA (10%) 0.05 Neutralizer Dow

[0065] B component includes isocyanate curing agent 278 80%, dilution solvent propylene glycol diacetate PGDA 20%.

[0066] Component A: component B mass ratio = 9:1.

[0067] The preparation method of the two-component polyurethane floor one flat paint comprises the following steps: firstly, hydroxy acrylic dispersion / hydroxy acrylic polyurethane is added into a container, the dispersion speed is adjusted to 800 r / min, stirring is performed for 20 min, then film forming aid, defoaming agent, substrate wetting agent, neutralizing agent and thickening agent are added, after the addition is completed, the dispersion speed is maintained unchanged and dispersion is continuously performed for 20 min, then matt powder is added therein in proportion, 800 r / min stirring is performed for 30 min, and 325 mesh filter screen is used for filtration, so that component A is obtained. The curing agent in component B is diluted with dilution solvent. Measured components A and B are mixed according to the designed ratio, deionized water is added, the Zahn-3 cup viscosity is adjusted to about 20 s, and the water-based two-component polyurethane floor one flat paint is obtained, which can be used for spraying.

[0068] Example 3

[0069] Paint component A is prepared according to the following formula, and the specific gravity is a weight percentage content.

[0070] Code Substance Specific Gravity Classification Supplier 1 Lacper 4233 60.00 Hydroxyl Acrylic Polyurethane Dow Chemical 2 Antkote 2042 25.00 Hydroxyl Acrylic Acid Dow Chemical 3 Water 2.30 / / 4 E1011 10.00 Flatting Powder Dow Corning 5 DPM 0.50 Coalescing Agent Dow 6 DPNB 0.50 Coalescing Agent Dow 7 TEGO KL245 0.50 Wetting Agent Tego 8 TEGO 902w 0.10 Defoamer Tego 9 U605(50％) 1.00 Thickener Dow Chemical 10 AMP-95 0.10 Neutralizer Dow

[0071] The mass percentage of each raw material in component B comprises isocyanate curing agent 270 80%, dilution solvent propylene glycol diacetate PGDA 20%.

[0072] The mass ratio of component A to component B is 8:1.

[0073] The preparation method of the two-component polyurethane floor one flat paint comprises the following steps: firstly, hydroxy acrylic dispersion / hydroxy acrylic polyurethane is added into a container, the dispersion speed is adjusted to 800 r / min, stirring is performed for 20 min, then film forming aid, defoaming agent, substrate wetting agent, neutralizing agent and thickening agent are added, after the addition is completed, the dispersion speed is maintained unchanged and dispersion is continuously performed for 20 min, then matt powder is added therein in proportion, 800 r / min stirring is performed for 30 min, and 325 mesh filter screen is used for filtration, so that component A is obtained. The curing agent in component B is diluted with dilution solvent. Measured components A and B are mixed according to the designed ratio, deionized water is added, the Zahn-3 cup viscosity is adjusted to about 20 s, and the water-based two-component polyurethane floor one flat paint is obtained, which can be used for spraying.

[0074] Example 4

[0075] Paint component A is prepared according to the following formula, and the specific gravity is a weight percentage content.

[0076]

[0077]

[0078] B component includes water-based isocyanate curing agent by mass percentage 268 50%, 278 30%, dilution solvent propylene glycol diacetate PGDA 20%.

[0079] Component A: mass ratio of component B = 10:1.

[0080] The preparation method of the two-component polyurethane floor-in-one matte paint comprises the following steps: first, add the hydroxyl acrylic dispersion / hydroxyl acrylic polyurethane into a container, adjust the dispersion speed to 800 r / min, stir for 20 min, then add the film forming aid, defoaming agent, substrate wetting agent, neutralizing agent, thickening agent, and maintain the dispersion speed unchanged for 20 min after adding, then add the matt powder in proportion, stir at 800 r / min for 30 min, filter with a 325 mesh filter screen to obtain component A. The curing agent in component B is diluted with a dilution solvent. Mix the measured components A and B according to the designed ratio, add deionized water, adjust the Zahn-3 cup viscosity to about 17 s, and obtain the water-based two-component polyurethane floor-in-one matte paint, which can be used for spraying.

[0081] Comparative Example 1

[0082] Without using water-based hydroxyl acrylic dispersion 2706, which is replaced by a corresponding amount of water, and the rest is the same as Example 1.

[0083] Comparative Example 2

[0084] Without using water-based hydroxyl acrylic polyurethane dispersion 4288, which is replaced by a corresponding amount of water, and the rest is the same as Example 1.

[0085] Comparative Example 3

[0086] Replace the water-based hydroxyl polyurethane acrylic dispersion in Example 1 with water-based hydroxyl acrylic resin DIC WD-582 (OH-PA, medium-low hydroxyl 2.2%) in equal proportion 4288, and the rest remains unchanged.

[0087] Comparative Example 4

[0088] Replace the water-based hydroxyl acrylic dispersion in Example 1 with water-based hydroxyl acrylic resin DIC WD-570 (OH-PA, high hydroxyl 3.9%) in equal proportion 2706, and the rest remains unchanged.

[0089] Comparative Example 5

[0090] The water-based hydroxyl polyurethane acrylic dispersion in Example 4, the water-based hydroxyl acrylic dispersion were replaced by DIC WD-582 (OH-PA, low hydroxyl 2.2%), DIC WD-570 (OH-PA, high hydroxyl 3.9%) and the like in the same proportion 4288、 2706, the rest remains unchanged.

[0091] The water-based two-component polyurethane base-in-one matte paint in each example was tested for performance, and the results are shown in Table 1.

[0092] Table 1 Performance test results of two-component polyurethane base-in-one matte paint

[0093]

[0094]

[0095] As can be clearly seen from Table 1, the two-component polyurethane base-in-one matte paint of Examples 1-4 of the present application has obvious advantages in dry speed, wear resistance, adhesion, and chemical resistance compared to Comparative Examples 1-5. Finally, it should be noted that the above description is only for the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fast drying, abrasion resistant, waterborne two-component polyurethane basecoat one-coat matte paint, characterized in that, Consists of: A component: consists of the following mass percentage components based on the total mass of the A component: Aqueous hydroxyl acrylic polyurethane dispersion 40~80%, Aqueous hydroxyl acrylic dispersion 5~35%, Matting powder 4~12%, Water 1~10%, Aqueous auxiliary 0.5~2.5%, Film forming auxiliary 0.5~2%, B component: consists of the following mass percentage components based on the total mass of the B component: Aqueous isocyanate curing agent 65~85%, Open dilution solvent 15~35%; Wherein, the mass ratio of the A component and the B component is 6~10:1; The aqueous hydroxyl acrylic polyurethane dispersion is an aqueous hydroxyl acrylic polyurethane dispersion with a core-shell structure, the minimum film forming temperature MFFT is 20~50℃, the acid value is 10~30mgKOH / g, the solid content is 35~50wt%, and the hydroxyl content is 1.2~2.2%; the aqueous hydroxyl acrylic polyurethane dispersion is selected from one or more of Lacper®4288, Lacper®4233, Crysol®6510 of Wanhua Chemical; The aqueous hydroxyl acrylic dispersion is an aqueous hydroxyl acrylic dispersion with a core-shell structure, the glass transition temperature Tg is 50~70℃, the acid value is 26~45mgKOH / g, the molecular weight Mw=20000~50000g / mol, the solid content is 35~50wt%, and the hydroxyl content is 3.0~4.2%; the aqueous hydroxyl acrylic dispersion is selected from one or more of Antkote®2032B, Antkote®2042, Antkote®2706 of Wanhua Chemical, and Bayhydrol®A2770 of Covestro.

2. The quick-drying, abrasion-resistant, water-borne two-component polyurethane, one-coat, matte finish of claim 1, wherein, Consists of: A component: consists of the following mass percentage components based on the total mass of the A component: Aqueous hydroxyl acrylic polyurethane dispersion 40~80%, Aqueous hydroxyl acrylic dispersion 5~35%, Matting powder 4~12%, Water 1~10%, Aqueous auxiliary 0.5~2.5%, Film forming auxiliary 0.5~2%, B component: consists of the following mass percentage components based on the total mass of the B component: Aqueous isocyanate curing agent 65~85%, Open dilution solvent 15~35%; 3. The quick-drying, abrasion-resistant, water-borne two-component polyurethane basecoat finish matte paint according to claim 1 or 2, characterized in that Wherein, the mass ratio of the A component and the B component is 6~10:1; 4. The quick-drying, abrasion-resistant, water-borne two-component polyurethane basecoat finish matte paint according to claim 1 or 2, characterized in that, The aqueous hydroxyl acrylic polyurethane dispersion is an aqueous hydroxyl acrylic polyurethane dispersion with a core-shell structure, the minimum film forming temperature MFFT is 20~50℃, the acid value is 10~30mgKOH / g, the solid content is 35~50wt%, and the hydroxyl content is 1.2~2.2%; the aqueous hydroxyl acrylic polyurethane dispersion is selected from one or more of Lacper®4288, Lacper®4233, Crysol®6510 of Wanhua Chemical; 5. The quick-drying, abrasion-resistant, water-borne two-component polyurethane, one-coat, matte finish of claim 4, wherein, The aqueous hydroxyl acrylic dispersion is an aqueous hydroxyl acrylic dispersion with a core-shell structure, the glass transition temperature Tg is 50~70℃, the acid value is 26~45mgKOH / g, the molecular weight Mw=20000~50000g / mol, the solid content is 35~50wt%, and the hydroxyl content is 3.0~4.2%; the aqueous hydroxyl acrylic dispersion is selected from one or more of Antkote®2032B, Antkote®2042, Antkote®2706 of Wanhua Chemical, and Bayhydrol®A2770 of Covestro. Consists of: A component: consists of the following mass percentage components based on the total mass of the A component: Aqueous hydroxyl acrylic polyurethane dispersion 40~80%, 6. The quick-drying, abrasion-resistant, water-borne two-component polyurethane, basecoat- finish, matte paint according to claim 1 or 2, characterized in that Aqueous hydroxyl acrylic dispersion 5~35%, 7. The quick-drying, abrasion-resistant, water-borne two-component polyurethane, basecoat- finish, matte paint according to claim 1 or 2, characterized in that Matting powder 4~12%, Water 1~10%, Aqueous auxiliary 0.5~2.5%, Film forming auxiliary 0.5~2%, B component: consists of the following mass percentage components based on the total mass of the B component: Aqueous isocyanate curing agent 65~85%, Open dilution solvent 15~35%; Wherein, the mass ratio of the A component and the B component is 6~10:1; The aqueous hydroxyl acrylic polyurethane dispersion is an aqueous hydroxyl acrylic polyurethane dispersion with a core-shell structure, the minimum film forming temperature MFFT is 20~50℃, the acid value is 10~30mgKOH / g, the solid content is 35~50wt%, and the hydroxyl content is 1.2~2.2%; the aqueous hydroxyl acrylic polyurethane dispersion is selected from one or more of Lacper®4288, Lacper®4233, Crysol®6510 of Wanhua Chemical; The aqueous hydroxyl acrylic dispersion is an aqueous hydroxyl acrylic dispersion with a core-shell structure, the glass transition temperature Tg is 50~70℃, the acid value is 26~45mgKOH / g, the molecular weight Mw=20000~50000g / mol, the solid content is 35~50wt%, and the hydroxyl content is 3.0~4.2%; the aqueous hydroxyl acrylic dispersion is selected from one or more of Antkote®2032B, Antkote®2042, Antkote®2706 of Wanhua Chemical, and Bayhydrol®A2770 of Covestro. The matting powder is any one of DKS E1011, Graces SY7000. The aqueous auxiliary includes at least any one of wetting agent, defoaming agent, neutralizing agent, thickening agent. The wetting agent is selected from any one of Tego 270, Tego KL245, BYK 346, and / or, The defoaming agent is selected from any one of Tego 902W, TEGO Foamex 825, TEGO 1488, and / or, The thickening agent is selected from any one of Wanhua U505, U905, U605, and / or, The neutralizing agent is selected from any one of DMEA, AMP 95. The film forming auxiliary is one or more of dipropylene glycol methyl ether, dipropylene glycol butyl ether, and dipropylene glycol dimethyl ether. The aqueous isocyanate curing agent is a sulfonate modified HDI trimer.

8. The quick-drying, abrasion-resistant, water-borne two-component polyurethane, one-coat, matte finish paint according to claim 7, characterized in that, The aqueous isocyanate curing agent is one or more of Aquolin® 268, Aquolin® 270, Aquolin® 278 from Wanhua Chemical.

9. The quick-drying, abrasion-resistant, water-borne, two-component polyurethane, basecoat- finish, matte paint according to claim 1 or 2, characterized in that, The opening diluent solvent is selected from one or more of ethylene glycol butyl ether acetate, propylene glycol diacetate, propylene glycol methyl ether acetate.

10. A method for preparing the fast-drying and wear-resistant waterborne two-component polyurethane base-in-one matte paint according to any one of claims 1-9, comprising the following steps: (1) mixing the waterborne hydroxyl dispersion, the waterborne hydroxyl acrylic dispersion, the matting powder, deionized water, the waterborne additive, and the film-forming additive uniformly, and filtering to obtain component A; (2) mixing the isocyanate curing agent and the opening diluent solvent uniformly to obtain component B; (3) mixing components A and B in a metered ratio, adding water, adjusting the Zahn-3 cup viscosity to 15-20 s, and filtering to obtain the fast-drying and wear-resistant waterborne two-component polyurethane base-in-one matte paint.

11. The fast-drying and wear-resistant waterborne two-component polyurethane base-in-one matte paint according to any one of claims 1-9 for use in the field of decoration and protection in the plastic paint industry.

12. The use of the quick-drying wear-resistant waterborne two-component polyurethane basecoat-integrated matte paint according to claim 11 in the field of decoration and protection in the plastic paint industry, characterized in that, Use in a waterborne two-component low-temperature fast-drying and wear-resistant base-in-one matte system.

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