An antibacterial ink for gypsum board surface and its preparation method

Abstract

This invention provides an antibacterial ink for gypsum board surfaces and its preparation method, belonging to the field of ink technology. The antibacterial ink for gypsum board surfaces provided by this invention comprises the following components in parts by weight: 20-40 parts resin binder, 0.5-5 parts graphene, 5-15 parts iron black, 1-8 parts blackening agent, 1-3 parts dispersant, 0.1-1 part defoamer, 0.1-1 part leveling agent, and 10-30 parts solvent. This invention promotes uniform dispersion of each raw material in the ink system through stepwise preparation of the dispersion liquid, resulting in an antibacterial ink for gypsum board surfaces without significant agglomeration or precipitation, thus solving the problem of simultaneously achieving antibacterial, antifungal, and antiviral functions with color.

Description

Technical Field

[0001] This invention belongs to the field of ink technology, specifically relating to an antibacterial ink for gypsum board surfaces and its preparation method. Background Technology

[0002] Gypsum board, a widely used material in building interior decoration, is typically coated with ink to achieve aesthetic and opaque effects. Traditional inks used on gypsum board surfaces often employ a coloring system combining carbon black and fillers. The carbon black primarily provides the black hue, while the fillers adjust the ink's physical properties and reduce costs.

[0003] However, in practical applications, traditional inks have significant functional defects. On the one hand, gypsum board is often used in high-humidity environments such as kitchens, bathrooms, and basements, which are prone to the growth of bacteria and mold. Traditional inks lack the ability to inhibit microbial growth, leading to mold spots and bacterial growth on the surface of gypsum board. This not only affects aesthetics but also harms human health, causing respiratory diseases, skin allergies, and other problems. On the other hand, given the increasing emphasis on public health and safety, the risk of virus transmission cannot be ignored. Traditional inks lack antiviral properties and cannot effectively inactivate viruses that may be present on the surface of gypsum board, failing to meet people's higher demands for a healthy and safe indoor environment.

[0004] To address the aforementioned issues, technicians in related fields have attempted to improve ink formulations, typically by adding functional components such as antibacterial agents and antifungal agents. For example, patent CN119842266A discloses a durable antibacterial and retortable ink, its preparation method, and its application, using water-based acrylic resin, water-based polyurethane resin, modified carbon black, and antibacterial components as raw materials to improve the antibacterial durability of water-based inks. However, existing improvements suffer from several drawbacks. Adding functional components significantly affects the blackness of the ink, resulting in a lighter and uneven color on the gypsum board surface, failing to achieve the appearance effect of traditional carbon black inks. Furthermore, some solutions exhibit poor compatibility between the functional components and the ink system, leading to precipitation and aggregation, which not only affects the coating performance and stability of the ink but also prevents the functional components from fully exerting their effects, resulting in short-lasting and inefficient antibacterial, antifungal, and antiviral effects. Therefore, developing an ink formulation that can significantly improve the antibacterial, antifungal, and antiviral effects on gypsum board surfaces while maintaining the same blackness as traditional carbon black inks has become a pressing technical problem in the industry. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an antibacterial ink for gypsum board surfaces and its preparation method. The objective of this invention is to optimize the formulation of traditional carbon black and functional fillers by using a combination of graphene, blackening agents, and iron black. This achieves the same blackness as traditional inks while solving the problems of existing traditional gypsum board surface inks lacking antibacterial, antifungal, and antiviral functions, and the difficulty in simultaneously achieving both functionality and color. A further objective of this invention is to overcome the defects of poor compatibility and unstable effects of functional components in existing inks, thereby improving the stability and coatability of the gypsum board surface ink system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, the present invention provides an antibacterial ink for gypsum board surface, comprising the following components in parts by weight: 20-40 parts resin binder, 0.5-5 parts graphene, 5-15 parts iron black, 1-8 parts blackening agent, 1-3 parts dispersant, 0.1-1 parts defoamer, 0.1-1 parts leveling agent, and 10-30 parts solvent.

[0007] This invention uses a resin binder as the base film-forming material for the ink, which can uniformly disperse and bind graphene, iron black powder components, and blackening agents together to form a continuous and uniform coating, ensuring good adhesion between the coating and the gypsum board surface. Utilizing the two-dimensional sheet-like structure of graphene, a continuous conductive network and physical barrier layer can be formed in the ink coating on the gypsum board surface. By disrupting the cell membranes of bacteria and molds and the protein shells of viruses, it achieves antibacterial, antifungal, and antiviral effects. Furthermore, its high specific surface area enhances its adsorption capacity for microorganisms and viruses. In synergy with iron black, it increases the contact area with bacteria and molds, and the iron ions further disrupt the enzyme system of microorganisms, inhibiting their growth and reproduction and improving inactivation efficiency. The addition of a blackening agent further improves tinting strength and hiding power, effectively compensating for the insufficient ink color caused by reducing the amount of traditional carbon black, ensuring that the optimized ink has the same black color as traditional carbon black inks.

[0008] Preferably, the mass ratio of iron black to graphene is (3.5-8):1; the iron black is nano-sized iron black with a particle size of 50-200 nm. This invention utilizes the coloring properties of iron black to assist blackening agents and graphene in jointly adjusting the blackness of inks; and the nano-sized iron black exhibits good dispersibility in inks, further enhancing the functionality and mechanical properties of gypsum board coatings.

[0009] Preferably, the graphene is a single-layer graphene with a sheet diameter of 0.5-5 μm and a specific surface area of ​​500-1500 m². 2 / g. The specific sheet size and specific surface area of ​​graphene can ensure its good dispersibility in resin binders, avoid agglomeration, and give full play to its functional role.

[0010] Preferably, the blackening agent is one or both of benzimidazole ketone blackening agents and dioxazine blackening agents; the mass ratio of the blackening agent to iron black is 1:(1.5-3). Both benzimidazole ketone blackening agents and dioxazine blackening agents have good compatibility with resin binders and will not negatively affect the stability of the ink system on the gypsum board surface. Among them, benzimidazole ketone blackening agents have good lightfastness and weather resistance; dioxazine blackening agents have strong tinting strength and bright color.

[0011] Preferably, the resin binder is one or more of acrylic resin, polyurethane resin, and epoxy resin; the mass ratio of the resin binder to graphene is (8-25):1. Among these, acrylic resin has good weather resistance, water resistance, and gloss; polyurethane resin has good flexibility and strong adhesion; and epoxy resin has high hardness and excellent chemical corrosion resistance. Appropriate resin types or combinations can be selected according to the usage environment and performance requirements of the gypsum board.

[0012] Preferably, the dispersant is one or more of polycarboxylate dispersants and polyurethane dispersants. By adding a dispersant, this invention can reduce the agglomeration force between powders such as graphene and iron black, allowing them to be uniformly dispersed in the resin binder, thereby improving the stability and uniformity of the ink on the gypsum board surface.

[0013] Preferably, the defoamer is one of silicone-based defoamers or mineral oil-based defoamers. This effectively eliminates bubbles generated during ink preparation and coating, preventing defects such as pinholes and bubbles from appearing in the coating.

[0014] Preferably, the leveling agent is one of acrylate leveling agents or silicone leveling agents. This improves the flowability and coatability of inks on gypsum board surfaces, resulting in a smooth and even coating surface and enhanced appearance quality.

[0015] Preferably, the solvent is one or more selected from ethanol, isopropanol, ethyl acetate, and butyl acetate. Adjusting the viscosity of the ink on the gypsum board surface facilitates the coating process, while allowing it to gradually evaporate during the drying process, ensuring the quality of the coating film.

[0016] On the other hand, the present invention provides a method for preparing the above-mentioned antibacterial ink for gypsum board surfaces, comprising the following steps: S1: Add graphene and iron black to 15-30% of the total solvent, then add 45-55% of the total dispersant, and stir thoroughly to obtain graphene dispersion and iron black dispersion. S2: Add the remaining solvent to the resin binder, stir and mix to obtain a resin solution; S3: Add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir at high speed to obtain a mixed system; S4: Add blackening agent, defoamer, and leveling agent to the mixing system, stir and mix well, and then filter through a 100-200 mesh filter to obtain antibacterial ink for gypsum board surface.

[0017] Preferably, in step S1, the stirring speed is 1000-2000 r / min and the stirring time is 20-40 min; in step S2, the stirring speed is 500-1000 r / min and the stirring time is 10-20 min; in step S3, the stirring speed is 1500-2500 r / min and the stirring time is 30-60 min; and in step S4, the stirring speed is 800-1500 r / min and the stirring time is 20-30 min.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The antibacterial ink for gypsum board surfaces of this invention achieves an antibacterial rate of over 99% against Escherichia coli and Staphylococcus aureus, a mold resistance level of 0 against Aspergillus niger and Aspergillus flavus, and an inactivation rate of over 91% against COVID-19 and influenza viruses, effectively improving the hygiene and safety of the gypsum board usage environment. This antibacterial ink for gypsum board surfaces can be stored at room temperature for more than 6 months while maintaining good fluidity and uniformity. After application, the coating surface is smooth and free of defects such as pinholes and bubbles, and the adhesion meets the level 1 requirement, demonstrating good performance and long-term stability. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0020] General Implementation Examples An antibacterial ink for gypsum board surface comprises the following components in parts by weight: 20-40 parts resin binder, 0.5-5 parts graphene, 5-15 parts iron black, 1-8 parts blackening agent, 1-3 parts dispersant, 0.1-1 part defoamer, 0.1-1 part leveling agent, and 10-30 parts solvent.

[0021] In some preferred embodiments of the present invention, an antibacterial ink for gypsum board surface comprises the following components in parts by weight: 25-35 parts resin binder, 1-4 parts graphene, 8-14 parts iron black, 3-7 parts blackening agent, 1.5-2.5 parts dispersant, 0.3-0.8 parts defoamer, 0.3-0.8 parts leveling agent, and 20-25 parts solvent.

[0022] In some preferred embodiments of the present invention, the mass ratio of iron black to graphene is (3.5-8):1; the iron black is nano-sized iron black with a particle size of 50-200 nm.

[0023] In some preferred embodiments of the present invention, the graphene is a single-layer graphene with a sheet diameter of 0.5-5 μm and a specific surface area of ​​500-1500 m². 2 / g.

[0024] In some preferred embodiments of the present invention, the blackening agent is one or two of benzimidazole blackening agents and dioxazine blackening agents; the mass ratio of the blackening agent to iron black is 1:(1.5-3).

[0025] In some preferred embodiments of the present invention, the resin binder is one or more of acrylic resin, polyurethane resin, and epoxy resin; the mass ratio of the resin binder to graphene is (8-25):1.

[0026] In some preferred embodiments of the present invention, the dispersant is one or more of polycarboxylate dispersants and polyurethane dispersants.

[0027] In some preferred embodiments of the present invention, the defoamer is one of silicone defoamers or mineral oil defoamers.

[0028] In some preferred embodiments of the present invention, the leveling agent is one of acrylate leveling agents or silicone leveling agents.

[0029] In some preferred embodiments of the present invention, the solvent is one or more of ethanol, isopropanol, ethyl acetate, and butyl acetate.

[0030] A method for preparing an antibacterial ink for gypsum board surfaces includes the following steps: S1: Add graphene and iron black to 15-30% of the total solvent, then add 45-55% of the total dispersant, and stir thoroughly to obtain graphene dispersion and iron black dispersion. S2: Add the remaining solvent to the resin binder, stir and mix to obtain a resin solution; S3: Add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir at high speed to obtain a mixed system; S4: Add blackening agent, defoamer, and leveling agent to the mixing system, stir and mix well, and then filter through a 100-200 mesh filter to obtain antibacterial ink for gypsum board surface.

[0031] In some preferred embodiments of the present invention, in step S1, the stirring speed is 1000-2000 r / min, and the stirring time is 20-40 min. Through the action of the dispersant and high-speed stirring, the aggregates of graphene and iron black are broken up, promoting their initial dispersion in the solvent.

[0032] In some preferred embodiments of the present invention, in step S2, the stirring speed is 500-1000 r / min, and the stirring time is 10-20 min. By thoroughly mixing the resin binder and the solvent, the viscosity of the resin solution is adjusted so that it can better blend with the subsequent dispersion.

[0033] In some preferred embodiments of the present invention, in step S3, the stirring speed is 1500-2500 r / min, and the stirring time is 30-60 min. This ensures that the functional powder is uniformly dispersed in the resin system; under the action of high-speed stirring, the dispersion of graphene and iron black in the resin solution is further promoted, forming a uniform mixed system and avoiding local agglomeration.

[0034] In some preferred embodiments of the present invention, in step S4, the stirring speed is 800-1500 r / min and the stirring time is 20-30 min. Example 1

[0035] A method for preparing an antibacterial ink for gypsum board surfaces includes the following steps: S1: An antibacterial ink for gypsum board surfaces, comprising the following components in parts by weight: 25 parts acrylic resin, 1 part monolayer graphene, 8 parts nano iron black, 3 parts benzimidazole ketone blackening agent, 1.5 parts polycarboxylate dispersant, 0.3 parts silicone defoamer, 0.3 parts acrylate leveling agent, and 23 parts solvent; wherein the nano iron black has a particle size of 80-120 nm; the monolayer graphene has a sheet diameter of 0.5-2 μm and a specific surface area of ​​800-1000 m². 2 / g; Solvents include 15 parts ethanol and 8 parts ethyl acetate; S2: Add monolayer graphene to ethanol, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain graphene dispersion; wherein, by weight, ethanol 5 parts and polycarboxylate dispersant 0.8 parts; S3: Add nano-iron black to ethyl acetate, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain iron black dispersion; wherein, by weight, ethyl acetate 5 parts and polycarboxylate dispersant 0.7 parts; S4: Add acrylic resin to the reaction vessel and stir at 800 r / min while slowly adding the remaining solvent. Stir and mix for 15 min to obtain a resin solution. The remaining solvent, by weight, includes 10 parts ethanol and 3 parts ethyl acetate. S5: Slowly add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir and disperse for 45 minutes at a speed of 2000 r / min to obtain a mixed system. S6: Add benzimidazole blackening agent, silicone defoamer, and acrylic leveling agent to the mixing system. Stir and mix at 1200 r / min for 25 min, then filter through a 150 mesh filter to obtain antibacterial ink for gypsum board surface. Example 2

[0036] A method for preparing an antibacterial ink for gypsum board surfaces includes the following steps: S1: An antibacterial ink for gypsum board surfaces, comprising the following components in parts by weight: 30 parts polyurethane resin, 3 parts few-layer graphene, 12 parts nano iron black, 5 parts dioxazine blackening agent, 2 parts polyurethane dispersant, 0.5 parts mineral oil defoamer, 0.5 parts organosilicon leveling agent, and 22 parts solvent; wherein the nano iron black has a particle size of 100-150 nm; the single-layer graphene has a sheet diameter of 2-4 μm and a specific surface area of ​​1000-1200 m². 2 / g; Solvents include 12 parts isopropanol and 10 parts butyl acetate; S2: Add a few layers of graphene to isopropanol, then add a polyurethane dispersant, and stir and disperse thoroughly for 35 minutes at a speed of 1800 r / min to obtain a graphene dispersion; wherein, by weight, isopropanol is 6 parts and polyurethane dispersant is 1 part. S3: Add nano iron black to butyl acetate, then add polyurethane dispersant, and stir and disperse thoroughly for 35 minutes at a speed of 1800 r / min to obtain iron black dispersion; wherein, by weight, 6 parts of butyl acetate and 1 part of polyurethane dispersant. S4: Add acrylic resin to the reaction vessel and stir at 900 r / min while slowly adding the remaining solvent. Stir and mix for 18 min to obtain a resin solution. The remaining solvent, by weight, includes 6 parts isopropanol and 4 parts butyl acetate. S5: Slowly add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir and disperse for 50 min at a speed of 2200 r / min to obtain a mixed system; S6: Add dioxazine blackening agent, mineral oil defoamer, and silicone leveling agent to the mixing system. Stir and mix for 28 minutes at a speed of 1300 r / min. Filter through a 180 mesh filter to obtain antibacterial ink for gypsum board surface. Example 3

[0037] A method for preparing an antibacterial ink for gypsum board surfaces includes the following steps: S1: An antibacterial ink for gypsum board surfaces, comprising the following components in parts by weight: 35 parts epoxy resin, 4 parts monolayer graphene, 14 parts nano-iron black, 7 parts benzimidazole blackening agent, 2.5 parts polycarboxylate dispersant, 0.8 parts silicone defoamer, 0.8 parts acrylate leveling agent, and 23 parts solvent; wherein the nano-iron black has a particle size of 150-200 nm; the monolayer graphene has a sheet diameter of 3-5 μm and a specific surface area of ​​1200-1500 m². 2 / g; Solvents include 8 parts ethanol and 15 parts butyl acetate; S2: Add monolayer graphene to ethanol, then add polycarboxylate dispersant, and stir thoroughly for 40 minutes at a speed of 2000 r / min to obtain graphene dispersion; wherein, by weight, ethanol is 4 parts and polycarboxylate dispersant is 1.3 parts. S3: Add nano iron black to butyl acetate, then add polycarboxylate dispersant, and stir and disperse thoroughly for 40 minutes at a speed of 2000 r / min to obtain iron black dispersion; wherein, by weight, butyl acetate is 8 parts and polycarboxylate dispersant is 1.2 parts. S4: Add acrylic resin to the reaction vessel and stir at 1000 r / min while slowly adding the remaining solvent. Stir and mix for 20 min to obtain a resin solution. The remaining solvent, by weight, includes 4 parts ethanol and 7 parts ethyl acetate. S5: Slowly add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir and disperse for 60 min at a speed of 2500 r / min to obtain a mixed system; S6: Add benzimidazole blackening agent, silicone defoamer, and acrylic leveling agent to the mixing system. Stir and mix for 30 minutes at a speed of 1500 r / min. Filter through a 200-mesh filter to obtain antibacterial ink for gypsum board surface.

[0038] Comparative Example 1 A method for preparing carbon black ink includes the following steps: S1: Weigh the following components in parts by weight: 25 parts acrylic resin, 10 parts carbon black, 8 parts calcium carbonate, 1.5 parts polycarboxylate dispersant, 0.3 parts silicone defoamer, 0.3 parts acrylate leveling agent, and 23 parts solvent; wherein the solvent includes 15 parts ethanol and 8 parts ethyl acetate. S2: Add calcium carbonate to ethanol, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain calcium carbonate dispersion; wherein, by weight, ethanol is 5 parts and polycarboxylate dispersant is 0.8 parts. S3: Add carbon black to ethyl acetate, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain carbon black dispersion; wherein, by weight, ethyl acetate 5 parts and polycarboxylate dispersant 0.7 parts; S4: Add acrylic resin to the reaction vessel and stir at 800 r / min while slowly adding the remaining solvent. Stir and mix for 15 min to obtain a resin solution. The remaining solvent, by weight, includes 10 parts ethanol and 3 parts ethyl acetate. S5: Slowly add calcium carbonate dispersion and carbon black dispersion to the resin solution in sequence, and stir and disperse for 45 minutes at a speed of 2000 r / min to obtain a mixed system; S6: Add silicone defoamer and acrylate leveling agent to the mixing system, stir and mix at 1200 r / min for 25 min, and then filter through a 150 mesh filter to obtain carbon black ink.

[0039] Comparative Example 2 A method for preparing ink for gypsum board surface includes the following steps: S1: Weigh the following components in parts by weight: 25 parts acrylic resin, 1 part monolayer graphene, 1 part nano iron black, 3 parts benzimidazole blackening agent, 1.5 parts polycarboxylate dispersant, 0.3 parts silicone defoamer, 0.3 parts acrylate leveling agent, and 23 parts solvent; wherein the nano iron black has a particle size of 80-120 nm; the monolayer graphene has a sheet diameter of 0.5-2 μm and a specific surface area of ​​800-1000 m². 2 / g; Solvents include 15 parts ethanol and 8 parts ethyl acetate; S2: Add monolayer graphene to ethanol, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain graphene dispersion; wherein, by weight, ethanol 5 parts and polycarboxylate dispersant 0.8 parts; S3: Add nano-iron black to ethyl acetate, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain iron black dispersion; wherein, by weight, ethyl acetate 5 parts and polycarboxylate dispersant 0.7 parts; S4: Add acrylic resin to the reaction vessel and stir at 800 r / min while slowly adding the remaining solvent. Stir and mix for 15 min to obtain a resin solution. The remaining solvent, by weight, includes 10 parts ethanol and 3 parts ethyl acetate. S5: Slowly add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir and disperse for 45 minutes at a speed of 2000 r / min to obtain a mixed system. S6: Add benzimidazole blackening agent, silicone defoamer, and acrylic leveling agent to the mixing system. Stir and mix at 1200 r / min for 25 min, then filter through a 150 mesh filter to obtain antibacterial ink for gypsum board surface.

[0040] Comparative Example 3 A method for preparing ink for gypsum board surface includes the following steps: S1: Weigh the following components in parts by weight: 25 parts acrylic resin, 1 part monolayer graphene, 8 parts nano iron black, 0.5 parts benzimidazole blackening agent, 1.5 parts polycarboxylate dispersant, 0.3 parts silicone defoamer, 0.3 parts acrylate leveling agent, and 23 parts solvent; wherein the nano iron black has a particle size of 80-120 nm; the monolayer graphene has a sheet diameter of 0.5-2 μm and a specific surface area of ​​800-1000 m². 2 / g; Solvents include 15 parts ethanol and 8 parts ethyl acetate; S2: Add monolayer graphene to ethanol, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain graphene dispersion; wherein, by weight, ethanol 5 parts and polycarboxylate dispersant 0.8 parts; S3: Add nano-iron black to ethyl acetate, then add polycarboxylate dispersant, and stir thoroughly for 30 minutes at a speed of 1500 r / min to obtain iron black dispersion; wherein, by weight, ethyl acetate 5 parts and polycarboxylate dispersant 0.7 parts; S4: Add acrylic resin to the reaction vessel and stir at 800 r / min while slowly adding the remaining solvent. Stir and mix for 15 min to obtain a resin solution. The remaining solvent, by weight, includes 10 parts ethanol and 3 parts ethyl acetate. S5: Slowly add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir and disperse for 45 minutes at a speed of 2000 r / min to obtain a mixed system. S6: Add benzimidazole blackening agent, silicone defoamer, and acrylic leveling agent to the mixing system. Stir and mix at 1200 r / min for 25 min, then filter through a 150 mesh filter to obtain antibacterial ink for gypsum board surface.

[0041] Detection example Examples 1-3 and Comparative Example 1 were tested for black color intensity, antibacterial rate, mildew resistance, and virus inactivation rate. The black color intensity was tested according to GB / T 1865-2009 Artificial Weathering and Artificial Radiation Exposure to Filtered Xenon Arc Radiation for Paints and Varnishes. The antibacterial rate was tested for antibacterial rates against Escherichia coli and Staphylococcus aureus. The mildew resistance was tested according to GB / T 1741-2020 Test Method for Mildew Resistance of Paint Films. The test results are shown in Table 1.

[0042] Table 1 According to the test results, the black color ΔE of the antibacterial ink on the gypsum board surface of the present invention reaches 0.5 or above, the antibacterial rate against Escherichia coli and Staphylococcus aureus can reach more than 99%, the anti-mildew level against Aspergillus niger and Aspergillus flavus reaches level 0, and the inactivation rate against the novel coronavirus and influenza virus reaches more than 91%, which can effectively improve the hygiene and safety of the gypsum board use environment.

[0043] This invention utilizes the synergistic effect of graphene and iron black. By leveraging the two-dimensional sheet structure and stable physicochemical properties of graphene, it can effectively disrupt the cell membranes of bacteria and molds and the protein coats of viruses. Furthermore, the trace amounts of iron ions released by the iron black enhance the inhibition of microbial enzyme systems, significantly improving the antibacterial, antifungal, and antiviral effects of the ink coating. According to the test results of Comparative Example 2, compared to Example 1, Comparative Example 2 used too little iron black, with a mass ratio of 1:1 to graphene, resulting in a significant reduction in the antibacterial, antifungal, and antiviral properties of the ink on the gypsum board surface.

[0044] This invention, by adjusting the ratio of blackening agent to iron black and graphene, utilizes the high tinting strength and hiding power of the blackening agent, along with the strong black coloring properties of iron black, to compensate for insufficient color without using traditional carbon black, thus meeting the aesthetic requirements of gypsum board surfaces and solving the problem of balancing functionality and color in existing technologies. Compared to the functionally optimized ink of this invention, the traditional carbon black ink in Comparative Example 1 clearly lacks antibacterial, antifungal, and antiviral properties. Comparative Example 3, compared to Example 1, uses too little blackening agent; the mass ratio of blackening agent to iron black is 1:16, and the balance between functionality and color is not achieved.

[0045] The preparation method of the antibacterial ink for gypsum board surface of the present invention is simple to operate. The equipment used is all conventional equipment in the industry, requiring no special high-end equipment investment. The production cost is low, and it is easy to achieve large-scale industrial production, with good market application prospects. The present invention selects graphene, blackening agent, iron black and various additives with good compatibility with resin binder. By stepwise preparation of dispersion liquid, it promotes the uniform dispersion of each raw material in ink system, without obvious agglomeration and precipitation. It ensures that the ink can be stored at room temperature for more than 6 months and still maintain good fluidity and uniformity. After coating, the coating surface is flat and smooth, without defects such as pinholes and bubbles. The adhesion meets the Class 1 requirement of "GB / T 9286-1998 Cross-cut test of paint and varnish film", and has excellent performance and long-term stability.

Claims

1. An antibacterial ink for gypsum board surfaces, characterized in that, It includes the following components in parts by weight: 20-40 parts resin binder, 0.5-5 parts graphene, 5-15 parts iron black, 1-8 parts blackening agent, 1-3 parts dispersant, 0.1-1 part defoamer, 0.1-1 part leveling agent, and 10-30 parts solvent.

2. The antibacterial ink for gypsum board surface according to claim 1, characterized in that, The mass ratio of iron black to graphene is (3.5-8):1; The iron black is nano-sized iron black with a particle size of 50-200 nm.

3. The antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The graphene is a single-layer graphene with a sheet diameter of 0.5-5 μm and a specific surface area of ​​500-1500 m². 2 / g.

4. The antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The blackening agent is one or two of benzimidazole blackening agents and dioxazine blackening agents; The mass ratio of the blackening agent to iron black is 1:(1.5-3).

5. An antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The resin binder is one or more of acrylic resin, polyurethane resin, and epoxy resin; The mass ratio of the resin binder to graphene is (8-25):

1.

6. An antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The dispersant is one or more of polycarboxylate dispersants and polyurethane dispersants.

7. An antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The defoamer is one of the following: organosilicon defoamer and mineral oil defoamer; The leveling agent is one of the following: acrylate leveling agent or silicone leveling agent.

8. An antibacterial ink for gypsum board surface according to claim 1 or 2, characterized in that, The solvent is one or more of ethanol, isopropanol, ethyl acetate, and butyl acetate.

9. A method for preparing antibacterial ink for gypsum board surface according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Add graphene and iron black to 15-30% of the total solvent, then add 45-55% of the total dispersant, and stir thoroughly to obtain graphene dispersion and iron black dispersion. S2: Add the remaining solvent to the resin binder, stir and mix to obtain a resin solution; S3: Add graphene dispersion and iron black dispersion to the resin solution in sequence, and stir at high speed to obtain a mixed system; S4: Add blackening agent, defoamer, and leveling agent to the mixing system, stir and mix well, and then filter through a 100-200 mesh filter to obtain antibacterial ink for gypsum board surface.

10. The method for preparing an antibacterial ink for gypsum board surface according to claim 9, characterized in that, In step S1, the stirring speed is 1000-2000 r / min, and the stirring time is 20-40 min; In step S2, the stirring speed is 500-1000 r / min, and the stirring time is 10-20 min; In step S3, the stirring speed is 1500-2500 r / min, and the stirring time is 30-60 min; In step S4, the stirring speed is 800-1500 r / min and the stirring time is 20-30 min.

Images