Scouring-resistant interior wall anti-fouling coating and preparation process thereof

Abstract

The invention relates to the technical field of interior wall coatings, in particular to a scrubbing-resistant interior wall anti-fouling coating and a preparation process thereof.The preparation process comprises the steps that a dispersing agent, a flatting agent, a defoaming agent and deionized water are mixed and then stirred for 30-40 min at the rotating speed of 1000-1500 r / min, and a mixed solution is obtained; pouring the modified talcum powder, the nano silicon dioxide and the mixed solution into the waterborne polyurethane emulsion, and stirring for 50-70 minutes at the rotating speed of 2500-3500 r / min, so as to obtain the scrubbing-resistant interior wall anti-fouling coating. According to the invention, the metal salt is loaded in the interlamellar gaps of the talcum powder, so that the metal ions in the coating are slowly released, and the metal ions in the coating are not greatly and quickly lost even if the washing frequency is increased; in addition, the nano silicon dioxide is added, so that the wear resistance of the coating is improved; and finally, the scrubbing resistance of the coating can be improved, and the long-acting antibacterial property of the coating is realized.

Description

Technical Field

[0001] The invention relates to the technical field of interior wall coatings, in particular to a washable interior wall anti-fouling coating and a preparation process thereof. Background Art

[0002] The harmful substances in interior wall paint mainly include volatile organic compounds, heavy metals and suspended particles, which together constitute indoor pollution sources and harm human health. Therefore, it is extremely important to carry out research on interior wall paint, improve the pollution of interior wall paint to the indoor environment, create a good living and working environment for people, and protect the health of the population. In recent years, a large number of scholars have participated in the research of interior wall paint, and improved the various performances of interior wall paint on the original basis, and also developed some new paints.

[0003] Water-based interior wall paint is a type of interior wall paint. It uses water as a dispersion medium and has the characteristics of health, environmental protection, and excellent performance. It has become the main variety of interior wall decoration materials. Water-based paint is mainly formed by mixing water-based polymer emulsion, pigments, fillers, and antibacterial agents. However, after several washes, the antibacterial agents are lost in large quantities and quickly due to lack of protection, thereby greatly reducing the antifouling and antibacterial properties of the coating. Based on this, a washable interior wall antifouling paint and its preparation process are proposed. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a washable interior wall anti-fouling coating and a preparation process thereof. By adding modified talcum powder, the slow release of metal ions in the coating is achieved. Combined with nano-silicon dioxide, the washability of the coating can be improved and the long-term antibacterial effect of the coating can be achieved.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a washable interior wall anti-fouling paint, comprising the following raw materials in parts by weight, 50-70 parts of waterborne polyurethane emulsion, 10-20 parts of modified talc, 5-10 parts of nano-silicon dioxide, 0.5-1 part of dispersant, 0.5-1 part of leveling agent, 0.2-0.5 part of defoaming agent, and 15-20 parts of deionized water.

[0006] Preferably, the particle size of the modified talc is 30-35 μm; the particle size of the nano-silicon dioxide is 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 defoaming agent is polydimethylsiloxane or tributyl phosphate.

[0009] Preferably, the preparation method of the modified talc powder is as follows: S1, placing talc powder into a mold for pressing to form powder flakes; S2, stacking the powder flakes and placing them in a reactor, injecting a metal salt solution into the reactor, and using a pressure pump to circulate the metal salt solution in the reactor and the pipeline; S3, after the cyclic loading is completed, taking out the powder flakes, and then drying and grinding them to obtain modified talc powder.

[0010] Preferably, in step S1, the powder sheet has a diameter of 1-1.5 cm and a thickness of 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 material-liquid ratio of the powder flakes to the metal salt solution is 1:5g / ml.

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

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

[0014] The present invention also provides a preparation process of a washable interior wall antifouling paint, comprising the following steps:

[0015] (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring at a speed of 1000-1500 r / min for 30-40 min to obtain a mixed solution;

[0016] (2) Pour the modified talcum powder, nano-silicon dioxide and the mixed liquid into the aqueous polyurethane emulsion, stir at a speed of 2500-3500 r / min for 50-70 min, and prepare a washable interior wall anti-fouling coating.

[0017] The present invention provides a washable interior wall antifouling paint and a preparation process thereof, which has the following beneficial effects compared with the prior art:

[0018] The present invention loads metal salts in the interlayer gaps of talcum powder to achieve slow release of metal ions in the coating. Even with the increase in the number of washing times, the metal ions in the coating will not be lost in large quantities and quickly. In addition, by adding nano-silicon dioxide, the wear resistance of the coating is improved. Ultimately, the washing resistance of the coating can be improved and the long-term antibacterial effect of the coating can be achieved.

[0019] The present invention presses talcum powder into sheets and piles them in a reactor. Compared with the traditional impregnation method, more metal ions can be loaded in the interlayer gaps of talcum powder through the circulation of metal salt solution, so as to improve the antibacterial performance of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the reactor, pressure pump and pipeline in the present invention. DETAILED DESCRIPTION

[0022] The following examples are used to explain the implementation methods of the present application in detail, so that the implementation process of how the present 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 talcum powder is as follows:

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

[0026] S2, stacking the powder flakes into a reactor, injecting a copper salt solution into the reactor, and using 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 40wt% ethanol solution, and its mass concentration is 12%; the material-liquid ratio of powder flakes to copper salt solution is 1:5g / ml.

[0028] S3. After the cycle load is completed, the powder flakes are taken out, and then dried and ground to obtain modified talcum powder.

[0029] Example 2

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

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

[0032] S2, stacking the powder flakes into a reactor, injecting a zinc salt solution into the reactor, and using 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 40wt% ethanol solution, and its mass concentration is 12%; the material-liquid ratio of powder flakes to zinc salt solution is 1:5g / ml.

[0034] S3. After the cycle load is completed, the powder flakes are taken out, and then dried and ground to obtain modified talcum powder.

[0035] Example 3

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

[0037] S1, put talcum powder into a mold and press it to form a powder sheet with a diameter of 1.2 cm and a thickness of 0.7 mm;

[0038] S2, stack the powder flakes and place them in a reactor, inject the 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 40wt% ethanol solution, and its mass concentration is 12%; the material-liquid ratio of powder flakes to copper salt solution is 1:5g / ml.

[0040] S3. After the cycle load is completed, the powder flakes are taken out, and then dried and ground to obtain modified talcum powder.

[0041] Example 4

[0042] A washable interior wall antifouling paint comprises the following raw materials in parts by weight: 70 parts of waterborne polyurethane emulsion, 10 parts of modified talc in Example 1, 10 parts of nano silicon dioxide, 0.5 parts of dispersant (polyethylene glycol 200), 1 part of leveling agent (sodium polyacrylate), 0.2 parts of defoaming agent (polydimethylsiloxane), and 20 parts of deionized water.

[0043] The particle size of the modified talc powder is 30-35 μm; the particle size of the nano silicon dioxide is 50-100 nm; and the solid content of the waterborne polyurethane emulsion is 50%.

[0044] The preparation process of the washable interior wall antifouling paint comprises the following steps:

[0045] (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring at a speed of 1500 r / min for 30 min to obtain a mixed solution;

[0046] (2) Pour the modified talcum powder, nano-silicon dioxide and the mixed liquid into the aqueous polyurethane emulsion, stir at a speed of 3500 r / min for 50 min, and prepare a washable interior wall anti-fouling coating.

[0047] Example 5

[0048] A washable interior wall antifouling paint comprises the following raw materials in parts by weight: 50 parts of waterborne polyurethane emulsion, 20 parts of modified talcum powder in Example 2, 5 parts of nano silicon dioxide, 1 part of dispersant (polyethylene glycol 400), 0.5 part of leveling agent (polyether modified polysiloxane), 0.5 part of defoaming agent (tributyl phosphate), and 15 parts of deionized water.

[0049] The particle size of the modified talc powder is 30-35 μm; the particle size of the nano silicon dioxide is 50-100 nm; and the solid content of the waterborne polyurethane emulsion is 60 percent.

[0050] The preparation process of the washable interior wall antifouling paint comprises the following steps:

[0051] (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring at a speed of 1000 r / min for 40 min to obtain a mixed solution;

[0052] (2) Pour the modified talcum powder, nano-silicon dioxide and the mixed liquid into the aqueous polyurethane emulsion, stir at a speed of 2500 r / min for 70 min, and prepare a washable interior wall anti-fouling coating.

[0053] Example 6

[0054] A washable interior wall antifouling paint comprises the following raw materials in parts by weight: 60 parts of waterborne polyurethane emulsion, 15 parts of modified talc in Example 3, 8 parts of nano silicon dioxide, 0.7 parts of dispersant (polyethylene glycol 200), 0.6 parts of leveling agent (sodium polyacrylate), 0.3 parts of defoaming agent (polydimethylsiloxane), and 16 parts of deionized water.

[0055] The particle size of the modified talc powder is 30-35 μm; the particle size of the nano silicon dioxide is 50-100 nm; and the solid content of the waterborne polyurethane emulsion is 50%.

[0056] The preparation process of the washable interior wall antifouling paint comprises the following steps:

[0057] (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring the mixture at a speed of 1200 r / min for 35 min to obtain a mixed solution;

[0058] (2) The modified talcum powder, nano-silicon dioxide and the mixed solution are poured into the aqueous polyurethane emulsion, and stirred at a speed of 3000 r / min for 60 min to prepare a washable interior wall anti-fouling coating.

[0059] Comparative Example 1

[0060] A washable interior wall antifouling paint and its preparation process are basically the same as those in Example 6, except that: the preparation method of the modified talcum powder is as follows:

[0061] The talcum powder is immersed in the copper salt solution for 1.5 hours; after the immersion, it is filtered and dried to obtain the modified talcum powder.

[0062] The copper salt solution is formed by dissolving copper salt in 40wt% ethanol solution, and its mass concentration is 12%; the material-liquid ratio of powder flakes to copper salt solution is 1:5g / ml.

[0063] Comparative Example 2

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

[0065] Comparative Example 3

[0066] A washable interior wall antifouling paint comprises the following raw materials in parts by weight: 60 parts of waterborne polyurethane emulsion, 15 parts of modified talcum powder in Example 3, 0.7 parts of dispersant (polyethylene glycol 200), 0.6 parts of leveling agent (sodium polyacrylate), 0.3 parts of defoaming agent (polydimethylsiloxane), and 16 parts of deionized water.

[0067] The particle size of the modified talc powder is 30-35 μm; the solid content of the aqueous polyurethane emulsion is 50%.

[0068] The preparation process of the washable interior wall antifouling paint comprises the following steps:

[0069] (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring the mixture at a speed of 1200 r / min for 35 min to obtain a mixed solution;

[0070] (2) Pour the modified talcum powder and the mixed liquid into the aqueous polyurethane emulsion, stir at a speed of 3000 r / min for 60 min, and prepare a washable interior wall anti-fouling 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 washability of the samples was tested according to the GB / T 9266-2009 washability test and the ISO 22196-2011 antibacterial test. The specific test results are shown in the following table.

[0073] Table 1 Scrub resistance

[0074]

[0075]

[0076] From the above table, 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 washing 1000 times, indicating that compared with the traditional immersion method, the tableting cycle loading method can load more metal salts in the same time.

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

[0079] (3) Compared with the sample in Example 6, the wear resistance of the coating in Comparative Example 3 is poor due to the lack of nano-silicon dioxide, and the modified talcum powder is quickly consumed. As the number of washings increases, the metal ions therein are quickly lost, thereby reducing the wash resistance of the coating.

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

Claims

1. A washable interior wall antifouling paint, characterized in that: The invention comprises the following raw materials in parts by weight: 50-70 parts of waterborne polyurethane emulsion, 10-20 parts of modified talc powder, 5-10 parts of nano silicon dioxide, 0.5-1 part of dispersant, 0.5-1 part of leveling agent, 0.2-0.5 part of defoamer and 15-20 parts of deionized water.

2. The washable interior wall antifouling paint according to claim 1, characterized in that: The particle size of the modified talc is 30-35 μm; the particle size of the nano silicon dioxide is 50-100 nm.

3. The washable interior wall antifouling paint according to claim 1, characterized in that: The solid content of the aqueous polyurethane emulsion is 50-60%.

4. The washable interior wall antifouling paint 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 defoaming agent is polydimethylsiloxane or tributyl phosphate.

5. The washable interior wall antifouling paint according to claim 1, characterized in that: The preparation method of the modified talcum powder is as follows: S1, putting talcum powder into a mold and pressing it to form powder tablets; S2, stacking the powder flakes into a reactor, injecting a metal salt solution into the reactor, and using a pressure pump to circulate the metal salt solution in the reactor and the pipeline; S3. After the cycle load is completed, the powder flakes are taken out, and then dried and ground to obtain modified talcum powder.

6. The washable interior wall antifouling paint according to claim 5, characterized in that: In step S1, the powder sheet has a diameter of 1-1.5 cm and a thickness of 0.5-1 mm.

7. The washable interior wall antifouling paint according to claim 5, characterized in that: In step S2, the metal salt solution is formed by dissolving the metal salt in a 40wt% ethanol solution, and the mass concentration thereof is 12%; the material-liquid ratio of the powder flakes to the metal salt solution is 1:5g / ml.

8. The washable interior wall antifouling paint according to claim 5, characterized in that: In step S2, the metal salt is any one of copper salt and zinc salt or a combination of the two.

9. The washable interior wall antifouling paint according to claim 5, characterized in that: In step S2, the cycle loading time is 1-2 hours.

10. The preparation process of the washable interior wall antifouling paint according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) mixing a dispersant, a leveling agent, a defoaming agent and deionized water, and stirring at a speed of 1000-1500 r / min for 30-40 min to obtain a mixed solution; (2) Pour the modified talcum powder, nano-silicon dioxide and the mixed liquid into the aqueous polyurethane emulsion, stir at a speed of 2500-3500 r / min for 50-70 min, and prepare a washable interior wall anti-fouling coating.

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