A water-based single-component paint, a method for preparing the same, and an application thereof

Abstract

The application discloses a kind of water-based single-component paint and its preparation method and application, it is related to paint technical field.The water-based single-component paint of the application includes emulsion A, emulsion B and emulsion C;Emulsion A is the grindable acrylic emulsion, emulsion B is low TG self-crosslinking acrylic emulsion, and emulsion C is middle TG self-crosslinking acrylic emulsion.The water-based single-component paint reduces VOC content while improving the film performance, and improves the pollution resistance and anti-graffiti performance of the film formed by the paint, has good environmental friendliness, little skin irritation, and is suitable as white finish paint for children furniture.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a water-based single-component paint, a preparation method and application thereof. BACKGROUND

[0002] At present, the white paint products for children's furniture on the market have performance that meets the standard requirements of GB / T 23999-2009 and HJ 2537-2014, but fail to pass the standard of GB / T 33394-2016 Water-based Wood Coatings for Children's Room Decoration. The pollution resistance of these white paints mainly manifests in tea resistance and vinegar resistance, but performs poorly in coffee resistance and red wine resistance, and also performs poorly in anti-graffiti performance of watercolor pens, whiteboard pens or inks commonly used by children, which is difficult to meet the daily use requirements of children's furniture. In addition, most white paint coatings still use polyurethane emulsion, which leads to the presence of free isocyanate monomers in the paint film formed by these coatings, which can easily irritate the skin of children, and thus does not meet the requirements of paint for children's furniture. SUMMARY

[0003] The present application aims to at least solve one of the above-mentioned technical problems in the prior art. To this end, the purpose of the present application is to provide a water-based single-component paint, which realizes excellent pollution resistance and anti-graffiti performance by compounding three different acrylic emulsions, and avoids the irritation caused by isocyanate monomers.

[0004] The second aspect of the present application provides a preparation method of a water-based single-component paint.

[0005] The third aspect of the present application provides a white paint.

[0006] The fourth aspect of the present application provides an application of a water-based single-component paint or a white paint.

[0007] In order to achieve the above-mentioned purposes, the technical solution adopted by the present application is:

[0008] The first aspect of the present application provides a water-based single-component paint, which comprises emulsion A, emulsion B and emulsion C; the emulsion A is a grindable acrylic emulsion, the emulsion B is a low-TG self-crosslinking acrylic emulsion, and the emulsion C is a medium-TG self-crosslinking acrylic emulsion.

[0009] The present application uses three different emulsion combinations to solve the problem of stain resistance. Among them, emulsion A is a grindable acrylic emulsion, which can provide excellent dispersion performance to pigments and fillers, so as to ensure the dispersion and stability of the system without using dispersants, and fundamentally solve the problem that the dispersant is dissolved out of the dry film of the paint film formed by the paint, thereby providing excellent water resistance and reducing the problem of organic compounds migrating out of the paint film. Emulsion B is a low-TG self-crosslinking acrylic emulsion, which is crosslinked with the TG self-crosslinking acrylic emulsion in emulsion C to form a film, effectively reducing the amount of film forming aid required for film formation, thereby reducing the content of VOC and improving the density of the paint film, thereby obtaining better stain resistance and hydrophobicity. In addition, emulsion C can also improve the mechanical properties and resistance of the paint film, further improving the performance in water and stain resistance. Therefore, by matching the three emulsions, the water-based single-component paint formed by the present application has excellent performance in water resistance, alcohol resistance, tea resistance, coffee resistance, red wine resistance, sweat stain / saliva resistance, and anti-graffiti.

[0010] In addition, since the three emulsions used in the present application are all acrylic emulsions, they have good environmental friendliness, and the paint film formed has less skin irritation and higher safety. At the same time, the present application does not need to use ammonia-based neutralizing agents and small molecular wet dispersants, reducing the content of semi-volatile organic compounds (SVOC) in the paint film, and thus being more environmentally friendly.

[0011] In some embodiments of the present application, the minimum film formation temperature (MFFT) of the emulsion B is 0-20℃.

[0012] In some embodiments of the present application, the minimum film formation temperature (MFFT) of the emulsion B is 5-20℃.

[0013] In some embodiments of the present application, the minimum film formation temperature (MFFT) of the emulsion C is 30-40℃.

[0014] In some embodiments of the present application, the minimum film formation temperature (MFFT) of the emulsion C is 30-35℃.

[0015] In the present application, the low-TG (glass transition temperature) and medium-TG (glass transition temperature) self-crosslinking acrylic emulsions refer to the self-crosslinking acrylic emulsions with the lowest film-forming temperature of 0-20℃ and the lowest film-forming temperature of 30-40℃, respectively. The low-TG self-crosslinking acrylic emulsion has excellent water resistance and chemical resistance, high crosslinking degree after film formation, dense paint film, and pollutants are not easy to penetrate into the paint film; the medium-TG self-crosslinking acrylic emulsion can provide good mechanical properties for the paint film, has excellent water resistance and chemical resistance, but due to the high film-forming temperature, the amount of film-forming aid required is also large, and in the present application, the low-TG self-crosslinking acrylic emulsion is compounded with the medium-TG self-crosslinking acrylic emulsion, which is beneficial to reduce the amount of film-forming aid.

[0016] In some embodiments of the present application, the mass ratio of the emulsion A, the emulsion B and the emulsion C is 1:(2-6):(2.5-7).

[0017] In some embodiments of the present application, the mass ratio of the emulsion A, the emulsion B and the emulsion C is 1:(2-4):(3-5).

[0018] In some specific embodiments of the present application, the mass ratio of the emulsion A, the emulsion B and the emulsion C is 1:(2.5-3.5):(3.5-4.5).

[0019] In some embodiments of the present application, the water-based single-component coating further comprises a mildew-proof agent; the mildew-proof agent comprises organic zinc and / or inorganic zinc.

[0020] The present application further uses a specific mildew-proof agent, the main component of which is a mixture of zinc pyrithione and / or zinc oxide, which is used to inhibit the reproduction of mold on the surface of dry paint film and has little skin irritation.

[0021] In some embodiments of the present application, the water-based single-component coating further comprises an auxiliary agent and water; the auxiliary agent comprises titanium white, film-forming aid, wetting agent, defoaming agent, thickening agent, wax emulsion and bactericide.

[0022] The addition of matting agent and titanium white will weaken the performance of the paint film and reduce the pollution resistance and anti-graffiti performance of the paint film. The use of grindable acrylic emulsion in the present application can avoid the negative effects of titanium white, and the use of wax emulsion instead of conventional matting agent can avoid the side effects of matting agent and also improve the anti-blocking performance of the paint film.

[0023] In some embodiments of the present application, the titanium white powder comprises rutile titanium white powder; the film forming aid comprises at least one of dipropylene glycol methyl ether (DPM), dipropylene glycol butyl ether (DPNB), and propylene glycol; the wetting agent comprises a silicone wetting agent; the leveling agent comprises a silicone leveling agent; the defoaming agent comprises a silicone defoaming agent and / or fumed silica; the thickening agent comprises a polyurethane thickening agent; and the wax emulsion comprises an aqueous wax emulsion.

[0024] In some specific embodiments of the present application, the thickening agent comprises a high shear thickening agent (e.g., Dow RM-2100) and a low shear thickening agent (e.g., Ashland NSL 210). Among them, the high shear thickening agent is beneficial to prevent splashing during production, improve leveling after construction; the low shear thickening agent helps to adjust the viscosity of the paint, improve the viscosity stability, and improve the anti-sagging performance during construction. In some examples of the present application, the mass ratio of the high shear thickening agent to the low shear thickening agent is 1:(1-2).

[0025] In some embodiments of the present application, the aqueous single-component paint comprises the following components by mass fraction:

[0026] Emulsion A 5-10 parts, emulsion B 15-30 parts, emulsion C 25-40 parts, mildewcide 0.5-1.5 parts, auxiliary agent 19.5-37.3 parts, water 2-10 parts.

[0027] In some embodiments of the present application, the auxiliary agent comprises the following components by mass fraction:

[0028] Titanium white powder 15-25 parts, film forming aid 2-5 parts, wetting agent 0.3-1 part, leveling agent 0.1-0.5 part, defoaming agent 0.5-1 part, thickening agent 0.5-1.5 parts, wax emulsion 1-3 parts, fungicide 0.1-0.3 parts.

[0029] In some embodiments of the present application, the aqueous single-component paint comprises the following components by mass fraction:

[0030] Emulsion A 5-10 parts, emulsion B 20-30 parts, emulsion C 25-35 parts, mildewcide 0.5-1.5 parts, auxiliary agent 24.5-32 parts, water 5-10 parts.

[0031] In some embodiments of the present application, the auxiliary agent comprises the following components by mass fraction:

[0032] Titanium white powder 18-23 parts, film forming aid 3-4 parts, wetting agent 0.3-0.7 parts, leveling agent 0.1-0.2 parts, defoaming agent 0.5-0.7 parts, thickening agent 0.7-1.2 parts, wax emulsion 1-2 parts, fungicide 0.1-0.2 parts.

[0033] In some embodiments of the present application, the emulsion A is 6-8 parts by mass.

[0034] The second aspect of the present application provides a preparation method of the water-based single-component paint according to the first aspect of the present application, comprising the following steps:

[0035] Mixing and dispersing the components to obtain the water-based single-component paint.

[0036] In some embodiments of the present application, the mixing and dispersing process comprises the following steps:

[0037] Mixing the emulsion A, water, defoaming agent and titanium white to obtain titanium white paste; mixing the emulsion B and emulsion C, adding the mixture of water, film-forming aid, wetting agent and thickening agent, and then adding the titanium white paste, leveling agent, wax emulsion, mildew-proof agent, sterilizing agent and water, and mixing to obtain the water-based single-component paint.

[0038] In some embodiments of the present application, the defoaming agent is added three times, the first time when preparing the titanium white paste, the second time when preparing the mixture of emulsion B, emulsion C, water, film-forming aid, wetting agent and thickening agent, and the third time when adding the titanium white paste into the mixture.

[0039] In some specific embodiments of the present application, the mass ratio of the defoaming agent added in the first, second and third times is 1:(2-3):(2-3).

[0040] In some embodiments of the present application, the fineness of the titanium white paste is checked after adding the titanium white paste, and then other components are continuously added.

[0041] In some embodiments of the present application, the fineness of the titanium white paste is 15-25 μm.

[0042] The third aspect of the present application provides a white finish paint comprising the water-based single-component paint according to the first aspect of the present application.

[0043] The fourth aspect of the present application provides an application of the water-based single-component paint according to the first aspect of the present application or the white finish paint according to the third aspect of the present application in preparing furniture.

[0044] In some embodiments of the present application, the furniture comprises furniture for children.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] The water-based single-component coating of the present application is compounded by adding three different emulsions, wherein the medium TG self-crosslinking acrylic emulsion serves as a framework, and the low TG self-crosslinking acrylic emulsion is used for crosslinking and film formation, which helps to reduce the amount of film forming aids, and does not need to add high boiling point film forming aids, ammonia neutralizing agent, dispersant and other components that are not conducive to reducing the migration of semi-volatile organic compounds, while ensuring the film performance after film formation, reducing the VOC content. At the same time, the grindable acrylic emulsion and the two self-crosslinking acrylic emulsions complement each other, improving the stain resistance and anti-graffiti performance of the paint film formed by the coating. In addition, the three emulsions are all acrylic emulsions, which have good environmental friendliness, avoiding the irritation of free isocyanate groups in conventional polyurethane emulsion to the skin. Therefore, the water-based single-component coating is suitable for use as a white finish paint and is applied to the preparation of furniture coatings, especially for children's furniture. DETAILED DESCRIPTION

[0047] The content of the present application is further described in detail through specific examples. The raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial channels or can be obtained by existing technical methods, unless otherwise specified. Unless otherwise specified, the test or test method is a conventional method in the art.

[0048] Table 1: Raw material description table of examples and comparative examples

[0049]

[0050]

[0051] Example 1

[0052] This example provides a water-based single-component coating, and the formula is shown in Table 2.

[0053] The preparation method of the water-based single-component coating comprises the following steps:

[0054] S1. Put part of pure water (3-4% of the total pure water mass), 0.1 mass fraction of defoaming agent 1 and emulsion A into a clean container, and then disperse while adding titanium white powder; disperse at medium speed for 10 minutes, grind to a fineness of less than 20um using a sand mill, and filter to obtain titanium white slurry;

[0055] S2. Put emulsion B and emulsion C into another clean container respectively, and stir uniformly at 800 rpm to obtain a mixed emulsion;

[0056] S3. Take another clean container, pour part of the pure water, and pour the film-forming aid, wetting agent, thickening agent 1, and thickening agent 2 (mass ratio of thickening agent 1:thickening agent 2 = 3:2) while stirring. After stirring uniformly, pour the mixed solution into the mixed emulsion of step S2, and then pour 0.3 parts by mass of defoaming agent 2. Increase the rotation speed to 1500 rpm, and disperse for 15 minutes. Reduce the rotation speed, and then pour the titanium white paste in step S1 and 0.2 parts by mass of defoaming agent 3.

[0057] S4. After increasing the rotation speed to 1800 rpm and dispersing for 30 minutes, sample and detect the fineness (refer to GB / T 1724-2019 for detection). Ensure that the fineness is qualified (refer to GB / T 23999-2009, and the actual control fineness in this example is 25 μm) and that there is no shrinkage hole. Then, pour the leveling agent and wax emulsion, disperse for 10 minutes at 1500 rpm. Continue to pour the water-diluted mildew-proof agent and bactericide, disperse for 10 minutes at 1500 rpm. Reduce the speed, pour the remaining pure water, and stir for 10 minutes at 1000 rpm to obtain the water-based single-component paint.

[0058] Examples 2-3

[0059] Examples 2-3 provide a water-based single-component paint. The different points from Example 1 are shown in Table 2. The preparation method is the same as that of Example 1.

[0060] Table 2 Formulation table of water-based single-component paints of Examples 1-3 (parts by mass)

[0061] Example 1 Example 2 Example 3 Emulsion A 8 8 8 Emulsion B-3 25 - - Emulsion B-2 - 25 - Emulsion B-1 - - 25 Emulsion C 30 30 30 Titanium dioxide 21 21 21 Film forming aid 3.5 3.5 3.5 Wetting agent 0.5 0.5 0.5 Leveling agent 0.2 0.2 0.2 Defoaming agent 0.6 0.6 0.6 Thickening agent 1 1 1 Wax emulsion 1.5 1.5 1.5 Mildewcide 1 1 1 Bactericide 0.1 0.1 0.1 Pure water 7.8 7.8 7.8

[0062] In the table, the amount of defoaming agent is the total amount of defoaming agents 1-3, and the amount of thickening agent is the total amount of thickening agents 1-2.

[0063] Examples 4-7

[0064] Examples 4-7 provide a water-based single-component paint. The different points from Example 1 are shown in Table 3. The preparation method is the same as that of Example 1.

[0065] Table 3 Formulation table of water-based single-component paints of Examples 1 and 4-7 (parts by mass)

[0066]

[0067]

[0068] In the table, the amount of defoaming agent is the total amount of defoaming agents 1-3, and the amount of thickening agent is the total amount of thickening agents 1-2.

[0069] Examples 8-10

[0070] Examples 8-10 provide a waterborne one-component coating, the difference from Example 1 is shown in Table 4; the preparation method is the same as Example 1.

[0071] Table 4 Formulation table of waterborne one-component coatings of Example 1 and Examples 8-10 (mass parts)

[0072] Example 1 Example 8 Example 9 Example 10 Emulsion A 8 8 8 8 Emulsion B-3 25 20 30 15 Emulsion C 30 35 25 40 Titanium dioxide 21 21 21 21 Film forming aid 3.5 3.5 3.5 3.5 Wetting agent 0.5 0.5 0.5 0.5 Leveling agent 0.2 0.2 0.2 0.2 Defoaming agent 0.6 0.6 0.6 0.6 Thickening agent 1 1 1 1 Wax emulsion 1.5 1.5 1.5 1.5 Mildewcide 1 1 1 1 Bactericide 0.1 0.1 0.1 0.1 Pure water 7.8 7.8 7.8 7.8

[0073] In the table, the amount of defoamer is the total amount of defoamer 1-3, and the amount of thickener is the total amount of thickener 1-2.

[0074] Comparative Example 1

[0075] This comparative example provides a waterborne one-component coating, the difference from Example 1 is that emulsion B-3 is replaced by a conventional commercially available non-crosslinking acrylic emulsion (MFFT = 21℃, Wanhua Chemical Lacper 4502).

[0076] Comparative Example 2

[0077] This comparative example provides a waterborne one-component coating, the difference from Example 1 is that emulsion B-3 is replaced by an equal amount of emulsion C (i.e. emulsion B-3 is 0 mass parts and emulsion C is 55 mass parts), and the film-forming aid is replaced by 5 mass parts of a mixture of DPM and DPNB (mass ratio DPM:DPNB = 2:3) and 0.5 mass parts of CZ-12; the preparation method is the same as Example 1.

[0078] Comparative Example 3

[0079] This comparative example provides a waterborne one-component coating, the difference from Example 1 is that emulsion B-3 and emulsion C are replaced by 35 mass parts of emulsion C and 20 mass parts of a high-TG self-crosslinking acrylic emulsion (conventional commercial product, MFFT = 55℃), and the film-forming aid is replaced by 7 mass parts of a mixture of DPM and DPNB and 1 mass parts of CZ-12; the preparation method is the same as Example 1.

[0080] Comparative Example 4

[0081] This comparative example provides a waterborne one-component coating, the difference from Example 1 is that emulsion B-3 and emulsion C are replaced by 40 mass parts of emulsion C and 15 mass parts of a high-TG self-crosslinking acrylic emulsion (conventional commercial product, MFFT = 55℃), and the film-forming aid is replaced by 6 mass parts of a mixture of DPM and DPNB and 1 mass parts of CZ-12; the preparation method is the same as Example 1.

[0082] Comparative Example 5

[0083] The comparative example provides a water-based single-component paint, which is different from example 1 in that emulsion B-3 and emulsion C are replaced with 45 parts by mass of emulsion C and 10 parts by mass of a high-TG polyurethane emulsion (conventional commercial product), the film-forming aid is replaced with 5 parts by mass of a mixture of DPM and DPNB and 1 part by mass of CZ-12; and the preparation method is the same as that of example 1.

[0084] Comparative example 6

[0085] The comparative example provides a water-based single-component paint, which is different from example 1 in that emulsion B-3 and emulsion C are replaced with 45 parts by mass of emulsion C and 10 parts by mass of a high-TG polyurethane emulsion (conventional commercial product), the film-forming aid is replaced with 5 parts by mass of a mixture of DPM and DPNB and 1 part by mass of CZ-12; and the preparation method is the same as that of example 1.

[0086] Comparative example 7

[0087] The comparative example provides a water-based single-component paint, which is different from example 2 in that emulsion B-2 and emulsion C are replaced with equal amounts of emulsion B-3; and the preparation method is the same as that of example 2.

[0088] Comparative example 8

[0089] The comparative example provides a water-based single-component paint, which is different from example 3 in that emulsion B-1 and emulsion C are replaced with equal amounts of emulsion B-3; and the preparation method is the same as that of example 3.

[0090] Comparative example 9

[0091] The comparative example provides a water-based single-component paint, which is different from example 1 in that emulsion B-3 and emulsion C are replaced with equal amounts of emulsion C; and the preparation method is the same as that of example 1.

[0092] Results detection

[0093] The water-based single-component paints obtained in the above examples and comparative examples are subjected to performance detection as white topcoats, and the test methods are shown in Table 5.

[0094] Table 5: Explanation table of paint test methods

[0095] Test item Test method Table dry time Refer to GB / T 1728-1979, table dry B method Real dry time Refer to GB / T 1728-1979, real dry A method Paint film hardness Refer to GB / T 6739, scratch Paint film gloss Refer to GB / T 9754 Anti-blocking GB / T 23999-2009 VOC content (theoretical value) Refer to HJ 2537-2014 Water resistance (24h) Refer to GB / T 4893.1-2021 Ethanol resistance (1h) Refer to GB / T 4893.1-2021 Red wine resistance (1h) Refer to GB / T 4893.1-2021 Green tea resistance (1h) Refer to GB / T 4893.1-2021 Coffee resistance (1h) Refer to GB / T 4893.1-2021 Artificial sweat (2h) Refer to GB / T 33394-2016 Artificial saliva (2h) Refer to GB / T 33394-2016 Anti-graffiti (watercolor pen, 24h) Refer to GB / T 33394-2016 Anti-graffiti (whiteboard pen, 24h) Refer to GB / T 33394-2016 Ink (24h) Refer to GB / T 33394-2016 Viscosity (25℃) GB / T 9269-2009 Flowability Use a paint stirrer to stir and visually compare Fineness (μm) GB / T 1724-2019

[0096] The test results are as follows:

[0097] Table 6: Comparison table of paint performance detection results of examples 1-3

[0098]

[0099]

[0100] As can be seen from Table 6, the three emulsions are compounded in the embodiments 1-3 of the present application, the obtained paint has short curing time, high film hardness, and the VOC content is only 45 g / L, far lower than 70 g / L in HJ 2537-2014, and the content of semi-volatile organic compounds (SVOC) is 0, which is more environmentally friendly than the traditional white paint, and can meet more stringent standards. At the same time, the use of three kinds of emulsions effectively reduces the amount of film forming additives, while ensuring the performance of the paint film, reducing the VOC content, and improving the stain resistance. Not only excellent in water resistance, ethanol resistance, red wine resistance, green tea resistance, coffee resistance, and sweat / spittle resistance, but also excellent in anti-graffiti effect. In addition, the addition of the new dry film mildew inhibitor effectively inhibits the reproduction of mold on the paint film, has the effects of antibacterial and mold prevention, and the selected emulsion is an acrylic emulsion, which is more environmentally friendly and less irritating to human skin.

[0101] Table 7 Comparison table of paint performance test results of example 1 and comparative example 1

[0102]

[0103]

[0104] Comparing the results of example 1 and comparative example 1 in Table 7, it can be seen that the ordinary non-crosslinking acrylic emulsion also has the characteristics of low film forming temperature and less film forming additives, but the stain resistance of the obtained paint is greatly reduced, and the stain resistance is not as good as that of example 1.

[0105] Table 8 Comparison table of paint performance test results of example 1 and comparative examples 2-5

[0106] Test item Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Water resistance (24h) / grade 1st grade 1st grade 1st grade 1st grade 1st grade Ethanol resistance (1h) / grade 1st grade 1st grade 4th grade 2nd grade 1st grade Red wine resistance (1h) / grade 1st grade 1st grade 2nd grade 1st grade 1st grade Green tea resistance (1h) / grade 1st grade 2nd grade 2nd grade 2nd grade 1st grade Coffee resistance (1h) / grade 2nd grade 3rd grade 3rd grade 3rd grade 2nd grade Artificial sweat (2h) Pass Pass Pass Pass Pass Artificial saliva (2h) Pass Pass Pass Pass Pass Anti-graffiti (watercolor pen, 24h) / grade 1st grade 2nd grade 3rd grade 2nd grade 2nd grade Anti-graffiti (whiteboard pen, 24h) / grade 2nd grade 3rd grade 3rd grade 3rd grade 2nd grade Ink (24h) / grade 1st grade 1st grade 1st grade 1st grade 1st grade

[0107] It can be found from example 1 and comparative examples 2-5 that in order to achieve a certain stain resistance, more film forming additives need to be added to the high TG emulsion, and the film forming temperature is higher. At this time, in order to ensure that the VOC content meets the standard of less than 70 g / L, high-boiling-point film forming additives need to be added to improve the performance of the paint film, resulting in an increase in the content of semi-volatile organic compounds, which is not as environmentally friendly as the compounding of emulsions A / B / C of the present application. As can be seen from the data in Table 8, the use of high TG self-crosslinking acrylic emulsion is not conducive to improving stain resistance. Because the film forming temperature is high, it is easy to cause insufficient film density, so the stain resistance is decreased. In comparative example 5, high TG polyurethane emulsion is used, and the stain resistance is better than that of comparative examples 3 and 4, but the anti-graffiti performance is inferior to that of example 1, and the amount of film forming additives is also higher, and high-boiling-point film forming additives (CZ-12) also need to be added.

[0108] Table 9 State of titanium white slurry obtained during the preparation of the coating of Examples 4-7

[0109] Example 4 Example 5 Example 6 Example 7 Viscosity Low Lower Medium High Flowability Excellent Excellent Good Poor Fineness (μm) 20 20 20 20

[0110] Table 10 Comparison table of the performance test results of the water-based single-component coating of Examples 4-7

[0111] Test item Example 4 Example 5 Example 6 Example 7 Water resistance (24h) / grade 1st grade 1st grade 1st grade 1st grade Ethanol resistance (1h) / grade 1st grade 1st grade 1st grade 1st grade Red wine resistance (1h) / grade 1st grade 1st grade 1st grade 1st grade Green tea resistance (1h) / grade 2nd grade 1st grade 1st grade 1st grade Coffee resistance (1h) / grade 3rd grade 2nd grade 2nd grade 2nd grade Artificial sweat (2h) Pass Pass Pass Pass Artificial saliva (2h) Pass Pass Pass Pass Anti-graffiti (watercolor pen, 24h) / grade 2nd grade 2nd grade 1st grade 1st grade Anti-graffiti (marker pen, 24 h) / grade 3 3 2 2 2 Ink (24 h) / grade 1 1 1

[0112] From Table 9 and Table 10, it can be seen that when the amount of titanium dioxide is basically unchanged, the amount of emulsion A (a grindable acrylic emulsion SETAQUA 6302) changes, which will affect the state of the intermediate product titanium white slurry during the preparation process, including the changes of viscosity and flowability. In Example 4, when the amount of emulsion A is low, the viscosity of the titanium white slurry is low, and the pollution resistance is reduced. In Example 7, the amount of emulsion A is high, and the pollution resistance of the coating is basically not affected compared with Example 1, but the flowability of the titanium white slurry is poor, which is not conducive to the preparation of the coating.

[0113] Table 11 Comparison table of the performance test results of the coating of Example 1 and Comparative Examples 6-8

[0114] 1 Test item Example 1 Comparative Example 6 Comparative Example 7 Comparative Example 8 Surface dry time / min 30 min 30 min 30 min 30 min Real dry time / min 60 min 80 min 70 min 60 min B 3B 3B 3B Paint film hardness / grade Anti-blocking property MM: A-0 MM: D-3 MM: D-2

[0115] From Table 11, it can be seen that using emulsion A and low-TG emulsion B without using medium-TG emulsion C, the curing time of the obtained coating is longer, the hardness of the paint film is reduced, and the anti-blocking performance is also significantly reduced.

[0116] Table 12 Comparison table of the performance test results of the coating of Example 1 and Comparative Example 9

[0117]

[0118]

[0119] From Table 12, it can be seen that when only emulsion A and emulsion C are used without adding emulsion B, the pollution resistance of the obtained coating used as a white topcoat is poorer than that of Example 1, for example, the coffee resistance and anti-graffiti performance are poorer.

[0120] Table 13 Comparison table of the performance test results of the coating of Example 1 and Examples 8-10

[0121] MM: D-2 Test item Example 1 Example 8 Example 9 Example 10 Surface dry time / min 30 min 30 min 30 min 30 min Real dry time / min 60 min 60 min 70 min 60 min B B 2B B Paint film hardness / grade Anti-blocking property MM: A-0 MM: A-0 MM: C-1 MM: A-0 Water resistance (24 h) / grade 1 1 1 1 Ethanol resistance (1 h) / grade 1 1 1 1 Red wine resistance (1 h) / grade 1 1 1 1 Green tea resistance (1 h) / grade 1 1 1 1 Coffee resistance (1 h) / grade 2 2 2 3 Artificial sweat stain (2 h) Pass Pass Pass Pass Artificial saliva stain (2 h) Pass Pass Pass Pass Anti-graffiti (watercolor pen, 24 h) / grade 1 1 1 2 Anti-graffiti (whiteboard pen, 24 h) / grade 2 2 2 2 Ink (24 h) / grade 1 1 1 1

[0122] From the test results of Table 13, it can be seen that when the addition ratio of the three emulsions changes, the hardness of the paint film formed by the coating, the anti-blocking performance, and the coffee resistance and anti-aquarelle graffiti performance will also change.

[0123] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application should be equivalent replacement manners and should be included in the protection scope of the present application.

Claims

1. A water-based, single-component coating, characterized in that, It includes emulsion A, emulsion B and emulsion C; wherein emulsion A is a grindable acrylic emulsion, emulsion B is a low Tg self-crosslinking acrylic emulsion and emulsion C is a medium Tg self-crosslinking acrylic emulsion; The mass ratio of emulsion A, emulsion B and emulsion C is 1:(2~6):(2.5~7); The minimum film-forming temperature of emulsion B is 0~20℃; The minimum film-forming temperature of the emulsion C is 30~40℃.

2. The water-based single-component coating according to claim 1, characterized in that, The water-based single-component coating also includes a mildew inhibitor; the mildew inhibitor includes organic zinc and / or inorganic zinc. And / or, the water-based single-component coating further includes additives and water; the additives include titanium dioxide, film-forming aids, wetting agents, defoamers, thickeners, wax emulsions, and bactericides.

3. The water-based single-component coating according to claim 2, characterized in that, By mass parts, it includes the following components: Emulsion A 5~10 parts, Emulsion B 15~30 parts, Emulsion C 25~40 parts, Antifungal agent 0.5~1.5 parts, Additives 19.5~37.3 parts, Water 2~10 parts.

4. The water-based single-component coating according to claim 3, characterized in that, The additives, by mass parts, comprise the following components: 15-25 parts titanium dioxide, 2-5 parts film-forming aid, 0.3-1 part wetting agent, 0.1-0.5 parts leveling agent, 0.5-1 part defoamer, 0.5-1.5 parts thickener, 1-3 parts wax emulsion, and 0.1-0.3 parts bactericide.

5. A method for preparing a water-based single-component coating according to any one of claims 1 to 4, characterized in that, Includes the following steps: The components are mixed and dispersed to obtain the water-based single-component coating.

6. The preparation method according to claim 5, characterized in that, The mixing and dispersing process includes the following steps: Emulsion A, water, defoamer, and titanium dioxide are mixed to obtain titanium dioxide paste; emulsion B and emulsion C are mixed, and a mixture of water, film-forming aid, wetting agent, and thickener is added, followed by titanium dioxide paste, leveling agent, wax emulsion, mildew inhibitor, bactericide, and water, and then mixed to obtain the water-based single-component coating.

7. A white topcoat, characterized in that, Includes the water-based single-component coating as described in any one of claims 1 to 4.

8. The use of a water-based single-component coating according to any one of claims 1 to 4 or a white topcoat according to claim 7 in the preparation of furniture.

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