Water-based antibacterial coating for building wall surface and preparation method thereof

Abstract

The application relates to the technical field of paint, and discloses a water-based antibacterial paint for building wall surfaces and a preparation method thereof, which is prepared from the following components: acrylic emulsion, film forming aid, titanium white powder, mica powder, defoaming agent, thickening agent, dispersing agent, composite nano material and deionized water; the water-based antibacterial paint for building wall surfaces prepared by the application can form a dense and uniform coating on the surface of the building wall surface, can form a close combination with the building wall surface, greatly improves the combination between the two, and the paint prepared by the application also has excellent antibacterial performance.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a water-based antibacterial coating for building walls and its preparation method. Background Technology

[0002] Architectural exterior wall coatings are coatings used to protect and decorate the exterior walls of buildings. By forming a coating on the surface of the building exterior wall, they can meet the protection needs of the building exterior wall under different climate and environmental conditions, not only improving the overall quality of the building, but also effectively extending the service life of the building.

[0003] Existing technology, application number CN 105949945 A, discloses an exterior wall coating. This coating comprises three components, A, B, and C, which are mixed in a weight ratio of 3:1:1 before use. Component A consists of epoxy resin, xylene, benzyl alcohol, and dibutyl ester; component B consists of epoxy curing agent, xylene, benzyl alcohol, dibutyl ester, and silane coupling agent; and component C consists of 600-800 mesh talc powder and 70-140 mesh quartz sand. This invention solves the problem of difficult surface renovation of aluminum composite panels, exhibiting extremely strong adhesion to the smooth surface of aluminum composite panels, while also achieving good adhesion of the putty layer. Application is simple and easy, and can be applied by roller or brush. However, it is not adaptable to different exterior wall substrates and lacks antibacterial properties, which can significantly reduce its lifespan.

[0004] Based on this, we propose a water-based antibacterial coating for building walls, hoping to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a water-based antibacterial coating for building walls and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A water-based antibacterial coating for building walls, characterized in that it is made from the following components:

[0008] Acrylic emulsion 40-55 parts, film-forming aid 3-3.8 parts, titanium dioxide 5-6 parts, mica powder 2-3 parts, defoamer 1-1.5 parts, thickener 1.2-1.4 parts, dispersant 1-1.2 parts, composite nanomaterials 4-6 parts, deionized water 10-12 parts.

[0009] As a further technical solution: the method for preparing the composite nanomaterial is as follows:

[0010] First, glacial acetic acid and anhydrous ethanol are added to the reaction vessel in sequence, and then tetrabutyl titanate is added dropwise. The mixture is stirred and mixed for 20 minutes.

[0011] Carbon nanotubes were uniformly dispersed in an ethanol solution to obtain a carbon nanotube dispersion.

[0012] The carbon nanotube dispersion was added to the reactor, the temperature was adjusted to 60°C, and the mixture was stirred for 2 hours. After standing for 20 hours, it was dried until the moisture content was less than 10% to obtain the reaction material.

[0013] The reactants were calcined for 1.5 hours to obtain the first base material;

[0014] The calcination temperature is 350℃;

[0015] Zinc nitrate and potassium hydroxide were added to water to prepare zinc nitrate solution and potassium hydroxide solution, respectively.

[0016] The concentrations of both zinc nitrate solution and potassium hydroxide solution are 0.3 mol / L;

[0017] Add hexadecyltrimethylammonium bromide to potassium hydroxide solution, stir for 10 min, heat to 75°C, add zinc nitrate solution, continue stirring for 2 hours, let stand for 2 hours, filter and dry to obtain the second base material;

[0018] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0019] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0020] The second base material and the first base material are mixed evenly to obtain composite nanomaterials;

[0021] The second base material is mixed with the first base material at a mass ratio of 10:1-2.

[0022] As a further technical solution: wherein the volume ratio of glacial acetic acid to anhydrous ethanol is 1:3;

[0023] The volume ratio of glacial acetic acid to tetrabutyl titanate is 1.2:1;

[0024] The ethanol solution has a mass fraction of 70%.

[0025] The mixing ratio of carbon nanotubes and ethanol solution is 1-2g:100mL.

[0026] As a further technical solution: the amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0027] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0028] The second base material is mixed with the first base material at a mass ratio of 10:1-2.

[0029] As a further technical solution: the film-forming aid is propylene glycol.

[0030] As a further technical solution: the defoamer is an organosilicone defoamer.

[0031] As a further technical solution: the thickener is sodium hydroxymethyl cellulose.

[0032] As a further technical solution: the dispersant is sodium silicate.

[0033] A method for preparing a water-based antibacterial coating for building walls includes the following steps:

[0034] (1) Weigh out the following components by weight: acrylic emulsion, film-forming aid, titanium dioxide, mica powder, defoamer, thickener, dispersant, composite nanomaterial, and deionized water;

[0035] (2) Add the above components to the mixer in sequence and mix for 30 minutes to obtain a preliminary mixture;

[0036] (3) The preliminary mixture is ultrasonically dispersed for 10 minutes to obtain a water-based antibacterial coating for building walls.

[0037] Compared with the prior art, the present invention provides a water-based antibacterial coating for building walls, which has the following beneficial effects:

[0038] The water-based antibacterial coating for building walls prepared by this invention can not only form a dense and uniform coating on the surface of building walls, but also form a tight bond with the building walls, greatly improving the bonding force between the two. At the same time, the coating prepared by this invention also has excellent antibacterial properties.

[0039] The composite nanomaterials introduced in this invention possess extremely high specific surface area and surface energy due to their tiny size, thereby enhancing their interaction with other substances in the coating and forming a more stable coating system. Because of the small size of the composite nanomaterials, the proportion of surface atoms is large, resulting in insufficient coordination number of surface atoms and a large number of unsaturated bonds and dangling bonds. These unsaturated bonds and dangling bonds are easy to chemically bond or physically adsorb with other substances in the coating, thereby significantly improving the adhesion strength of the coating.

[0040] When composite nanomaterials are added to the coating prepared in this invention, they form organic-inorganic material composites with other components in the coating. The formation of these composites helps to enhance the internal interaction forces of the coating, thereby improving its overall adhesion strength. The addition of composite nanomaterials improves the microstructure of the coating. The composite nanomaterials can fill pores and defects in the coating, reducing stress concentration points within the coating, thus improving the density and uniformity of the coating. Simultaneously, the composite nanomaterials can increase the contact area and interaction points between the coating and the substrate, further enhancing the adhesion strength of the coating and enabling it to adapt to various different exterior wall material substrates.

[0041] Under sunlight, especially ultraviolet light, the composite nanomaterials can spontaneously decompose into negatively charged electrons (e-) and positively charged holes (h+), forming electron-hole pairs. These electrons and holes migrate to the coating surface, where electrons are captured by oxygen adsorbed and dissolved on the surface of the composite nanomaterials, forming active superoxide anion free radicals; while holes oxidize OH- and H2O adsorbed on their surface into hydroxyl free radicals. Active oxygen and hydroxyl free radicals have high reactivity and can undergo oxidation reactions with various microorganisms, thereby destroying the cell structure of bacteria and achieving a bactericidal effect. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Acrylic emulsion with 45% solids content; Example

[0044] A method for preparing a water-based antibacterial coating for building walls includes the following steps:

[0045] (1) Weigh out the following components by weight: 40 parts acrylic emulsion, 3 parts propylene glycol, 5 parts titanium dioxide, 2 parts mica powder, 1 part organosilicon defoamer, 1.2 parts sodium hydroxymethyl cellulose, 1 part sodium silicate, 4 parts composite nanomaterials, and 10 parts deionized water.

[0046] The preparation method of composite nanomaterials is as follows:

[0047] First, glacial acetic acid and anhydrous ethanol are added to the reaction vessel in sequence, and then tetrabutyl titanate is added dropwise. The mixture is stirred and mixed for 20 minutes.

[0048] Carbon nanotubes were uniformly dispersed in an ethanol solution to obtain a carbon nanotube dispersion.

[0049] The carbon nanotube dispersion was added to the reactor, the temperature was adjusted to 60°C, and the mixture was stirred for 2 hours. After standing for 20 hours, it was dried until the moisture content was less than 10% to obtain the reaction material.

[0050] The reactants were calcined for 1.5 hours to obtain the first base material;

[0051] The calcination temperature is 350℃;

[0052] Zinc nitrate and potassium hydroxide were added to water to prepare zinc nitrate solution and potassium hydroxide solution, respectively.

[0053] The concentrations of both zinc nitrate solution and potassium hydroxide solution are 0.3 mol / L;

[0054] Add hexadecyltrimethylammonium bromide to potassium hydroxide solution, stir for 10 min, heat to 75°C, add zinc nitrate solution, continue stirring for 2 hours, let stand for 2 hours, filter and dry to obtain the second base material;

[0055] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0056] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0057] The second base material and the first base material are mixed evenly to obtain composite nanomaterials;

[0058] The second base material is mixed with the first base material at a mass ratio of 10:1.

[0059] The volume ratio of glacial acetic acid to anhydrous ethanol is 1:3.

[0060] The volume ratio of glacial acetic acid to tetrabutyl titanate is 1.2:1;

[0061] The ethanol solution has a mass fraction of 70%.

[0062] The mixing ratio of carbon nanotubes and ethanol solution is 1g:100mL.

[0063] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0064] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0065] The second base material is mixed with the first base material at a mass ratio of 10:1;

[0066] (2) Add the above components to the mixer in sequence and mix for 30 minutes to obtain a preliminary mixture;

[0067] (3) The preliminary mixture is ultrasonically dispersed for 10 minutes to obtain a water-based antibacterial coating for building walls. Example

[0068] A method for preparing a water-based antibacterial coating for building walls includes the following steps:

[0069] (1) Weigh out the following components by weight: 50 parts acrylic emulsion, 3.5 parts propylene glycol, 5.2 parts titanium dioxide, 2.8 parts mica powder, 1.4 parts organosilicon defoamer, 1.3 parts sodium hydroxymethyl cellulose, 1.1 parts sodium silicate, 5 parts composite nanomaterials, and 11 parts deionized water.

[0070] The preparation method of composite nanomaterials is as follows:

[0071] First, glacial acetic acid and anhydrous ethanol are added to the reaction vessel in sequence, and then tetrabutyl titanate is added dropwise. The mixture is stirred and mixed for 20 minutes.

[0072] Carbon nanotubes were uniformly dispersed in an ethanol solution to obtain a carbon nanotube dispersion.

[0073] The carbon nanotube dispersion was added to the reactor, the temperature was adjusted to 60°C, and the mixture was stirred for 2 hours. After standing for 20 hours, it was dried until the moisture content was less than 10% to obtain the reaction material.

[0074] The reactants were calcined for 1.5 hours to obtain the first base material;

[0075] The calcination temperature is 350℃;

[0076] Zinc nitrate and potassium hydroxide were added to water to prepare zinc nitrate solution and potassium hydroxide solution, respectively.

[0077] The concentrations of both zinc nitrate solution and potassium hydroxide solution are 0.3 mol / L;

[0078] Add hexadecyltrimethylammonium bromide to potassium hydroxide solution, stir for 10 min, heat to 75°C, add zinc nitrate solution, continue stirring for 2 hours, let stand for 2 hours, filter and dry to obtain the second base material;

[0079] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0080] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0081] The second base material and the first base material are mixed evenly to obtain composite nanomaterials;

[0082] The second base material is mixed with the first base material at a mass ratio of 10:1.5.

[0083] The volume ratio of glacial acetic acid to anhydrous ethanol is 1:3.

[0084] The volume ratio of glacial acetic acid to tetrabutyl titanate is 1.2:1;

[0085] The ethanol solution has a mass fraction of 70%.

[0086] The mixing ratio of carbon nanotubes and ethanol solution is 1.2g:100mL.

[0087] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0088] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0089] The second base material is mixed with the first base material at a mass ratio of 10:1.5;

[0090] (2) Add the above components to the mixer in sequence and mix for 30 minutes to obtain a preliminary mixture;

[0091] (3) The preliminary mixture is ultrasonically dispersed for 10 minutes to obtain a water-based antibacterial coating for building walls. Example

[0092] A method for preparing a water-based antibacterial coating for building walls includes the following steps:

[0093] (1) Weigh out the following components by weight: 55 parts acrylic emulsion, 3.8 parts propylene glycol, 6 parts titanium dioxide, 3 parts mica powder, 1.5 parts organosilicon defoamer, 1.4 parts sodium hydroxymethyl cellulose, 1.2 parts sodium silicate, 6 parts composite nanomaterials, and 12 parts deionized water.

[0094] The preparation method of composite nanomaterials is as follows:

[0095] First, glacial acetic acid and anhydrous ethanol are added to the reaction vessel in sequence, and then tetrabutyl titanate is added dropwise. The mixture is stirred and mixed for 20 minutes.

[0096] Carbon nanotubes were uniformly dispersed in an ethanol solution to obtain a carbon nanotube dispersion.

[0097] The carbon nanotube dispersion was added to the reactor, the temperature was adjusted to 60°C, and the mixture was stirred for 2 hours. After standing for 20 hours, it was dried until the moisture content was less than 10% to obtain the reaction material.

[0098] The reactants were calcined for 1.5 hours to obtain the first base material;

[0099] The calcination temperature is 350℃;

[0100] Zinc nitrate and potassium hydroxide were added to water to prepare zinc nitrate solution and potassium hydroxide solution, respectively.

[0101] The concentrations of both zinc nitrate solution and potassium hydroxide solution are 0.3 mol / L;

[0102] Add hexadecyltrimethylammonium bromide to potassium hydroxide solution, stir for 10 min, heat to 75°C, add zinc nitrate solution, continue stirring for 2 hours, let stand for 2 hours, filter and dry to obtain the second base material;

[0103] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0104] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0105] The second base material and the first base material are mixed evenly to obtain composite nanomaterials;

[0106] The second base material is mixed with the first base material at a mass ratio of 10:2.

[0107] The volume ratio of glacial acetic acid to anhydrous ethanol is 1:3.

[0108] The volume ratio of glacial acetic acid to tetrabutyl titanate is 1.2:1;

[0109] The ethanol solution has a mass fraction of 70%.

[0110] The mixing ratio of carbon nanotubes and ethanol solution is 2g:100mL.

[0111] The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%;

[0112] The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:2.

[0113] The second base material is mixed with the first base material at a mass ratio of 10:2;

[0114] (2) Add the above components to the mixer in sequence and mix for 30 minutes to obtain a preliminary mixture;

[0115] (3) The preliminary mixture is ultrasonically dispersed for 10 minutes to obtain a water-based antibacterial coating for building walls.

[0116] The following are comparative examples:

[0117] Comparative Example 1:

[0118] Based on Example 1, no composite nanomaterials are added, and the rest of the technical solutions are consistent with those in Example 1.

[0119] Comparative Example 2:

[0120] Based on Example 1, the composite nanomaterial is replaced only with an equal amount of the first base material, and the rest of the technical solutions are consistent with the technical solutions of Example 1.

[0121] Comparative Example 3:

[0122] Based on Example 1, the composite nanomaterial is replaced only with an equal amount of the second base material, and the rest of the technical solutions are consistent with those in Example 1.

[0123] test:

[0124] The adhesion strength of the coatings in the examples and comparative examples was tested on three different substrates: cement-based substrate, uneven ceramic tile surface, and flat glazed ceramic tile surface using the pull-out method. The test method was in accordance with JC / 2090-2011.

[0125] Table 1 Cement-based materials

[0126]

[0127] As can be seen from Table 1, the coating prepared by this invention has excellent adhesion to cement substrates;

[0128] Table 2 Smooth Glazed Ceramic Surface

[0129]

[0130] As can be seen from Table 2, the coating prepared by this invention has high adhesion performance to flat glazed ceramic tile surfaces.

[0131] Table 3 Non-flat ceramic tile surfaces

[0132]

[0133] As can be seen from Table 3, the coating prepared by the present invention has high bonding strength to uneven ceramic tile surfaces.

[0134] Antibacterial properties were tested on the samples of the examples and comparative examples. After coating and drying, the thickness of the samples was not more than 0.1 mm. The tests were conducted in accordance with GB / T21866-2008 "Determination of Antibacterial Properties and Antibacterial Effects of Antibacterial Coatings". The selected bacterial species were Staphylococcus aureus and Escherichia coli.

[0135] Table 4

[0136]

[0137] As can be seen from Table 4, the coating prepared by the present invention has excellent antibacterial properties.

[0138] 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 water-based antibacterial coating for building walls, characterized in that, It is made from the following ingredients in parts by weight: Acrylic emulsion 40-55 parts, film-forming aid 3-3.8 parts, titanium dioxide 5-6 parts, mica powder 2-3 parts, defoamer 1-1.5 parts, thickener 1.2-1.4 parts, dispersant 1-1.2 parts, composite nanomaterials 4-6 parts, deionized water 10-12 parts; The method for preparing the composite nanomaterial is as follows: First, glacial acetic acid and anhydrous ethanol are added to the reaction vessel in sequence, and then tetrabutyl titanate is added dropwise. The mixture is stirred and mixed for 20 minutes. Carbon nanotubes were uniformly dispersed in an ethanol solution to obtain a carbon nanotube dispersion. The carbon nanotube dispersion was added to the reactor, the temperature was adjusted to 60°C, and the mixture was stirred for 2 hours. After standing for 20 hours, it was dried until the moisture content was less than 10% to obtain the reaction material. The reactants were calcined for 1.5 hours to obtain the first base material; The calcination temperature is 350℃; Zinc nitrate and potassium hydroxide were added to water to prepare zinc nitrate solution and potassium hydroxide solution, respectively. The concentrations of both zinc nitrate solution and potassium hydroxide solution are 0.3 mol / L; Add hexadecyltrimethylammonium bromide to potassium hydroxide solution, stir for 10 min, heat to 75°C, add zinc nitrate solution, continue stirring for 2 hours, let stand for 2 hours, filter and dry to obtain the second base material; The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%; The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:

2. The second base material and the first base material are mixed evenly to obtain composite nanomaterials; The second base material is mixed with the first base material at a mass ratio of 10:1-2.

2. The water-based antibacterial coating for building walls according to claim 1, characterized in that: wherein, The volume ratio of glacial acetic acid to anhydrous ethanol is 1:3; The volume ratio of glacial acetic acid to tetrabutyl titanate is 1.2:1; The ethanol solution has a mass fraction of 70%. The mixing ratio of carbon nanotubes and ethanol solution is 1-2g:100mL.

3. The water-based antibacterial coating for building walls according to claim 2, characterized in that: The amount of hexadecyltrimethylammonium bromide added is 1.5 wt%; The zinc nitrate solution was added according to a zinc nitrate to potassium hydroxide molar ratio of 1:

2. The second base material is mixed with the first base material at a mass ratio of 10:1-2.

4. The water-based antibacterial coating for building walls according to claim 1, characterized in that: The film-forming aid is propylene glycol; The defoamer is an organosilicone defoamer.

5. The water-based antibacterial coating for building walls according to claim 1, characterized in that: The thickener is sodium hydroxymethyl cellulose; The dispersant is sodium silicate.

6. A method for preparing a water-based antibacterial coating for building walls according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Weigh out the following components by weight: acrylic emulsion, film-forming aid, titanium dioxide, mica powder, defoamer, thickener, dispersant, composite nanomaterial, and deionized water; (2) Add the above components to the mixer in sequence and mix for 30 minutes to obtain a preliminary mixture; (3) The preliminary mixture is ultrasonically dispersed for 10 minutes to obtain a water-based antibacterial coating for building walls.

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