A scrub-resistant interior wall stain-resistant coating and a preparation process thereof

Abstract

The application relates to the technical field of interior wall coating, in particular to a washable interior wall stain-resistant coating and a preparation process thereof, which comprises the following steps: mixing a dispersing agent, a leveling agent, a defoaming agent and deionized water, stirring at a rotating speed of 1000-1500 r / min for 30-40 min to obtain a mixed solution; pouring modified talcum powder, nano-silicon dioxide and the mixed solution into water-based polyurethane emulsion, stirring at a rotating speed of 2500-3500 r / min for 50-70 min to prepare the washable interior wall stain-resistant coating. The metal salt is loaded in the interlayer gap of the talcum powder, slow release of metal ions in the coating is realized, even if the number of washing times increases, the metal ions in the coating will not be lost in a large amount and quickly; and the wear resistance of the coating is improved through addition of the nano-silicon dioxide; finally, the washable performance of the coating is improved, and long-acting antibiosis of the coating is realized.

Description

Technical Field

[0001] This invention relates to the field of interior wall coating technology, specifically to a washable and stain-resistant interior wall coating and its preparation process. Background Technology

[0002] Harmful substances in interior wall coatings mainly include volatile organic compounds, heavy metals, and suspended particles, which together constitute indoor pollution sources and harm human health. Therefore, conducting research on interior wall coatings, improving their pollution effects on the indoor environment, creating a healthy living and working environment, and protecting public health are of paramount importance. In recent years, a large number of scholars have participated in the research of interior wall coatings, improving their various properties based on existing methods, and developing some new coatings.

[0003] Water-based interior wall coatings are a type of interior wall coating that uses water as a dispersion medium. They are characterized by their health benefits, environmental friendliness, and superior performance, making them a major type of interior wall decoration material. Water-based coatings are mainly formed by mixing water-based polymer emulsions, pigments, fillers, and antibacterial agents. However, after several washes, the antibacterial agents are lost in large quantities and rapidly due to lack of protection, significantly reducing the coating's antifouling and antibacterial properties. Based on this, a washable, stain-resistant interior wall coating and its preparation process are proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a washable and stain-resistant interior wall coating and its preparation process. By adding modified talc powder, the slow release of metal ions in the coating is achieved. Combined with nano-silica, the washability of the coating can be improved and the coating can achieve long-lasting antibacterial properties.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a washable and stain-resistant interior wall coating, comprising the following raw materials in parts by weight: 50-70 parts of water-based polyurethane emulsion, 10-20 parts of modified talc powder, 5-10 parts of nano-silica, 0.5-1 part of dispersant, 0.5-1 part of leveling agent, 0.2-0.5 parts of defoamer, and 15-20 parts of deionized water.

[0006] Preferably, the modified talc powder has a particle size of 30-35 μm; the nano-silica has a particle size of 50-100 nm.

[0007] Preferably, the solid content of the aqueous polyurethane emulsion is 50-60%.

[0008] Preferably, the dispersant is polyethylene glycol 200 or polyethylene glycol 400; the leveling agent is sodium polyacrylate or polyether-modified polysiloxane; and the defoamer is polydimethylsiloxane or tributyl phosphate.

[0009] Preferably, the modified talc powder is prepared as follows: S1, talc powder is placed in a mold and pressed to form powder flakes; S2, the powder flakes are stacked in a reactor, a metal salt solution is injected into the reactor, and a pressure pump is used to circulate the metal salt solution in the reactor and pipeline; S3, after the circulation load is completed, the powder flakes are removed, dried, and ground to obtain modified talc powder.

[0010] Preferably, in step S1, the diameter of the powder sheet is 1-1.5 cm and the thickness is 0.5-1 mm.

[0011] Preferably, in step S2, the metal salt solution is formed by dissolving the metal salt in a 40wt% ethanol solution, and its mass concentration is 12%; the ratio of powder to metal salt solution is 1:5 g / ml.

[0012] Preferably, in step S2, the metal salt is any one or a combination of two of copper salt and zinc salt.

[0013] Preferably, in step S2, the cyclic load time is 1-2 hours.

[0014] This invention also provides a process for preparing a washable and stain-resistant interior wall coating, comprising the following steps:

[0015] (1) Mix the dispersant, leveling agent, defoamer and deionized water, and stir at a speed of 1000-1500 r / min for 30-40 min to obtain a mixture;

[0016] (2) Pour the modified talc powder, nano silica and the mixture into the water-based polyurethane emulsion and stir at a speed of 2500-3500 r / min for 50-70 min to obtain a washable and stain-resistant interior wall coating.

[0017] This invention provides a washable and stain-resistant interior wall coating and its preparation process, which has the following advantages compared with the prior art:

[0018] This invention loads metal salts into the interlayer gaps of talc powder, enabling the slow release of metal ions in the coating. Even with increased washing cycles, the metal ions in the coating will not be lost in large quantities and rapidly. Furthermore, by adding nano-silica, the wear resistance of the coating is improved. Ultimately, this invention can enhance the coating's washability and achieve long-lasting antibacterial properties.

[0019] This invention presses talc powder into flakes and stacks them in a reactor. Compared with the traditional impregnation method, the circulation of metal salt solution allows more metal ions to be loaded into the interlayer gaps of the talc powder, thereby improving the antibacterial properties of the coating. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the reactor, pressure pump, and pipeline in this invention. Detailed Implementation

[0022] The following embodiments are provided to illustrate the implementation of this application in detail, so that the process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] Example 1

[0024] The preparation method of modified talc is as follows:

[0025] S1. Place the talcum powder into a mold and press it to form a powder sheet with a diameter of 1cm and a thickness of 0.5mm;

[0026] S2. Stack the powder flakes into the reactor, inject copper salt solution into the reactor, and use a pressure pump to circulate the copper salt solution in the reactor and pipeline for 1 hour.

[0027] The copper salt solution is formed by dissolving copper salt in a 40wt% ethanol solution, with a mass concentration of 12%; the ratio of powder to copper salt solution is 1:5 g / ml.

[0028] S3. After the cyclic load ends, remove the powder flakes, then dry and grind them to obtain modified talc powder.

[0029] Example 2

[0030] The preparation method of modified talc is as follows:

[0031] S1. Place the talcum powder into a mold and press it to form a powder sheet with a diameter of 1.5cm and a thickness of 1mm;

[0032] S2. Stack the powder flakes into the reactor, inject zinc salt solution into the reactor, and use a pressure pump to circulate the zinc salt solution in the reactor and pipeline for 2 hours.

[0033] The zinc salt solution is formed by dissolving zinc salt in a 40wt% ethanol solution, with a mass concentration of 12%; the ratio of powder to zinc salt solution is 1:5 g / ml.

[0034] S3. After the cyclic load ends, remove the powder flakes, then dry and grind them to obtain modified talc powder.

[0035] Example 3

[0036] The preparation method of modified talc is as follows:

[0037] S1. Press the talcum powder into the mold to form a powder sheet with a diameter of 1.2cm and a thickness of 0.7mm;

[0038] S2. Stack the powder flakes into the reactor, inject copper salt solution into the reactor, and use a pressure pump to circulate the copper salt solution in the reactor and pipeline for 1.5 hours.

[0039] The copper salt solution is formed by dissolving copper salt in a 40wt% ethanol solution, with a mass concentration of 12%; the ratio of powder to copper salt solution is 1:5 g / ml.

[0040] S3. After the cyclic load ends, remove the powder flakes, then dry and grind them to obtain modified talc powder.

[0041] Example 4

[0042] A washable and stain-resistant interior wall coating comprises the following raw materials in parts by weight: 70 parts of water-based polyurethane emulsion, 10 parts of modified talc powder from Example 1, 10 parts of nano silica, 0.5 parts of dispersant (polyethylene glycol 200), 1 part of leveling agent (sodium polyacrylate), 0.2 parts of defoamer (polydimethylsiloxane), and 20 parts of deionized water.

[0043] The modified talc has a particle size of 30-35 μm; the nano silica has a particle size of 50-100 nm; and the waterborne polyurethane emulsion has a solid content of 50%.

[0044] The preparation process of the above-mentioned washable and stain-resistant interior wall coating includes the following steps:

[0045] (1) After mixing the dispersant, leveling agent, defoamer and deionized water, stir at 1500 r / min for 30 min to obtain a mixture;

[0046] (2) Pour the modified talc powder, nano silica and the mixture into the water-based polyurethane emulsion and stir at 3500 r / min for 50 min to obtain a washable and stain-resistant interior wall coating.

[0047] Example 5

[0048] A washable and stain-resistant interior wall coating comprises the following raw materials in parts by weight: 50 parts of water-based polyurethane emulsion, 20 parts of modified talc powder from Example 2, 5 parts of nano silica, 1 part of dispersant (polyethylene glycol 400), 0.5 parts of leveling agent (polyether-modified polysiloxane), 0.5 parts of defoamer (tributyl phosphate), and 15 parts of deionized water.

[0049] The modified talc has a particle size of 30-35 μm; the nano silica has a particle size of 50-100 nm; and the waterborne polyurethane emulsion has a solid content of 60%.

[0050] The preparation process of the above-mentioned washable and stain-resistant interior wall coating includes the following steps:

[0051] (1) After mixing the dispersant, leveling agent, defoamer and deionized water, stir at 1000 r / min for 40 min to obtain a mixture;

[0052] (2) Pour the modified talc powder, nano silica and the mixture into the water-based polyurethane emulsion and stir at 2500 r / min for 70 min to obtain a washable and stain-resistant interior wall coating.

[0053] Example 6

[0054] A washable and stain-resistant interior wall coating comprises the following raw materials in parts by weight: 60 parts of water-based polyurethane emulsion, 15 parts of modified talc powder from Example 3, 8 parts of nano silica, 0.7 parts of dispersant (polyethylene glycol 200), 0.6 parts of leveling agent (sodium polyacrylate), 0.3 parts of defoamer (polydimethylsiloxane), and 16 parts of deionized water.

[0055] The modified talc has a particle size of 30-35 μm; the nano silica has a particle size of 50-100 nm; and the waterborne polyurethane emulsion has a solid content of 50%.

[0056] The preparation process of the above-mentioned washable and stain-resistant interior wall coating includes the following steps:

[0057] (1) After mixing the dispersant, leveling agent, defoamer and deionized water, stir at 1200 r / min for 35 min to obtain a mixture;

[0058] (2) Pour the modified talc powder, nano silica and the mixture into the water-based polyurethane emulsion and stir at 3000 r / min for 60 min to obtain a washable and stain-resistant interior wall coating.

[0059] Comparative Example 1

[0060] A washable and stain-resistant interior wall coating and its preparation process are basically the same as in Example 6, except that the modified talc powder is prepared as follows.

[0061] Talc powder was immersed in a copper salt solution for 1.5 hours; after immersion, it was filtered and dried to obtain modified talc powder.

[0062] The copper salt solution mentioned above is formed by dissolving copper salt in a 40wt% ethanol solution, with a mass concentration of 12%; the ratio of powder to copper salt solution is 1:5 g / ml.

[0063] Comparative Example 2

[0064] A washable and stain-resistant interior wall coating and its preparation process are basically the same as those in Example 6, except that the modified talc powder is replaced with talc powder and copper salt solution, wherein the amount of talc powder added is 10 parts and the amount of copper salt solution added is 5 parts.

[0065] Comparative Example 3

[0066] A washable and stain-resistant interior wall coating comprises the following raw materials in parts by weight: 60 parts of water-based polyurethane emulsion, 15 parts of modified talc powder from Example 3, 0.7 parts of dispersant (polyethylene glycol 200), 0.6 parts of leveling agent (sodium polyacrylate), 0.3 parts of defoamer (polydimethylsiloxane), and 16 parts of deionized water.

[0067] The modified talc has a particle size of 30-35 μm; the waterborne polyurethane emulsion has a solid content of 50%.

[0068] The preparation process of the above-mentioned washable and stain-resistant interior wall coating includes the following steps:

[0069] (1) After mixing the dispersant, leveling agent, defoamer and deionized water, stir at 1200 r / min for 35 min to obtain a mixture;

[0070] (2) Pour the modified talc powder and the mixture into the water-based polyurethane emulsion and stir at 3000 r / min for 60 min to obtain a washable and stain-resistant interior wall coating.

[0071] Quality Inspection

[0072] 1. The coatings prepared in Examples 4-6 and Comparative Examples 1-3 were used as samples for testing. The scrub resistance of the samples was tested according to GB / T 9266-2009 (scrub resistance test) and ISO 22196-2011 (antimicrobial test). The specific test results are shown in the table below.

[0073] Table 1 Washability

[0074]

[0075]

[0076] From the table above, we can see that:

[0077] (1) Compared with the sample in Example 6, the antibacterial rate of the sample in Comparative Example 1 decreased significantly after 1000 washes, indicating that compared with the traditional impregnation method, the tableting cyclic loading method can load more metal salts in the same amount of time.

[0078] (2) Compared with the sample in Example 6, the antibacterial rate of the sample in Comparative Example 2 decreased significantly after washing, indicating that modified talc helps to slowly release metal ions for sterilization and achieve long-term antibacterial effect. However, the direct use of metal salts will lead to the rapid loss of metal ions and the subsequent antibacterial effect will be worse.

[0079] (3) Compared with the sample in Example 6, the coating in Comparative Example 3 has poor wear resistance due to the lack of nano silica. The modified talc powder is quickly consumed. As the number of washes increases, the metal ions in it are quickly lost, which reduces the washability of the coating.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A washable and stain-resistant interior wall coating, characterized in that, The raw materials include the following parts by weight: 50-70 parts of waterborne polyurethane emulsion, 10-20 parts of modified talc, 5-10 parts of nano silica, 0.5-1 part of dispersant, 0.5-1 part of leveling agent, 0.2-0.5 parts of defoamer, and 15-20 parts of deionized water; The modified talc powder is prepared as follows: S1. Press the talcum powder into a mold to form a powder sheet; S2. Stack the powder flakes into the reactor, inject the metal salt solution into the reactor, and use a pressure pump to make the metal salt solution circulate in the reactor and pipeline. S3. After the cyclic load ends, remove the powder flakes, dry and grind them to obtain modified talc powder; In step S1, the diameter of the powder sheet is 1-1.5 cm and the thickness is 0.5-1 mm; In step S2, the metal salt solution is formed by dissolving the metal salt in a 40wt% ethanol solution, and its mass concentration is 12%; the ratio of powder to metal salt solution is 1:5 g / ml. In step S2, the cyclic load time is 1-2 hours.

2. The washable and stain-resistant interior wall coating according to claim 1, characterized in that, The modified talc powder has a particle size of 30-35 μm; the nano silica has a particle size of 50-100 nm.

3. The washable and stain-resistant interior wall coating according to claim 1, characterized in that, The solid content of the waterborne polyurethane emulsion is 50-60%.

4. The washable and stain-resistant interior wall coating according to claim 1, characterized in that, The dispersant is polyethylene glycol 200 or polyethylene glycol 400; the leveling agent is sodium polyacrylate or polyether-modified polysiloxane; and the defoamer is polydimethylsiloxane or tributyl phosphate.

5. The washable and stain-resistant interior wall coating according to claim 1, characterized in that, In step S2, the metal salt is any one or a combination of two of copper salts and zinc salts.

6. The preparation process of the washable and stain-resistant interior wall coating according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Mix the dispersant, leveling agent, defoamer and deionized water, and stir at 1000-1500 r / min for 30-40 min to obtain a mixture; (2) Pour the modified talc powder, nano silica and the mixture into the water-based polyurethane emulsion and stir at a speed of 2500-3500 r / min for 50-70 min to obtain a washable and stain-resistant interior wall coating.

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