Antibacterial interior wall coating and preparation method thereof

Abstract

The invention relates to the field of building coatings, and particularly discloses an antibacterial interior wall coating and a preparation method thereof.The antibacterial interior wall coating is prepared from, by weight, 30-50 parts of inorganic adhesive, 5-15 parts of functional powder, 20-40 parts of inorganic filler, 1-5 parts of auxiliaries and 15-25 parts of water; wherein the functional powder is obtained by compounding silane coupling agent modified tourmaline and zinc-loaded mesoporous silica. The antibacterial interior wall coating disclosed by the invention is high in antibacterial property, high in durability, free of volatile matters and green and environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of architectural coatings, in particular to an antibacterial interior wall coating and a preparation method thereof. BACKGROUND

[0002] With the improvement of people's health requirements for indoor environment, traditional latex paint is challenged because it may contain volatile organic compounds (VOCs). Inorganic coatings are gradually favored by the market due to their environmental protection, non-combustibility, mildew resistance and other advantages. However, the existing inorganic coatings have relatively single function, which is difficult to meet the deeper needs of consumers for "healthy home", such as improving air quality, antibacterial and antiviral. At present, some functional coatings with negative oxygen ion powder or antibacterial agent have appeared in the market, but there are the following problems: (1) compatibility and stability problems: the compatibility of ordinary negative oxygen ion powder and inorganic coating binder is poor, which is easy to agglomerate and settle, resulting in low and unstable efficiency of negative oxygen ion release of the coating, and poor durability. (2) narrow antibacterial spectrum and poor durability: common organic antibacterial agents (such as quaternary ammonium salt) are easy to fail in the high alkaline environment of inorganic system, and may migrate and volatilize, with poor antibacterial durability; while inorganic antibacterial agents such as silver ions have high cost, and there is a potential risk of discoloration. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an antibacterial interior wall coating which has strong antibacterial performance, strong durability, is green and environmentally friendly, and has low cost.

[0004] In order to solve the above technical problems, the present application provides an antibacterial interior wall coating, which comprises the following components by weight: inorganic adhesive 30-50 parts, functional powder 5-15 parts, inorganic filler 20-50 parts, auxiliary agent 1-5 parts, and water 15-25 parts. The functional powder is a composite of silane coupling agent modified tourmaline and zinc-loaded mesoporous silica.

[0005] As an improvement of the above technical solution, the preparation method of the functional powder is as follows: The silane coupling agent modified tourmaline and zinc-loaded mesoporous silica are dispersed in water, and reacted at 50-80℃ for 2-8h, and then solid-liquid separation is performed to obtain an intermediate product; The intermediate product is calcined at 300-400℃ for 1-3h to obtain the functional powder. The silane coupling agent is an amino silane coupling agent, and the weight ratio of the silane coupling agent modified tourmaline to the zinc-loaded mesoporous silica is (6-8):(2-4).

[0006] As an improvement of the above technical solution, the preparation method of the silane coupling agent modified tourmaline is as follows: The tourmaline is mixed with a modification liquid containing an amino silane coupling agent, and ground for 1-3h to obtain the silane coupling agent modified tourmaline. The weight ratio of tourmaline to the modified solution containing amino silane coupling agent is (0.5-2):100; the concentration of amino silane coupling agent in the solution containing amino silane coupling agent is 1.5-5wt%.

[0007] As an improvement of the above technical solution, the preparation method of the zinc-loaded mesoporous silica is: The template agent is added into water, TEOS and zinc source are added, and the intermediate product is obtained under alkaline conditions and at 10-40℃ for 4-8h; The intermediate product is calcined at 500-800℃ for 2-5h to obtain the zinc-loaded mesoporous silica; The molar ratio of Si in TEOS to Zn in zinc source is (5-10):1; The template agent is selected from one of Pluronic P123, F127 and CTAB; the zinc source is selected from one or more of zinc nitrate or its hydrate, zinc chloride or its hydrate, zinc sulfate or its hydrate, and zinc acetate or its hydrate.

[0008] As an improvement of the above technical solution, the specific surface area of the zinc-loaded mesoporous silica is ≥800m 2 / g, and the zinc loading amount is 0.5-1.5wt%.

[0009] As an improvement of the above technical solution, the inorganic binder is selected from silica sol, phosphate sol or borate sol; and / or The inorganic filler is selected from one or more of heavy calcium, talc powder, mica powder, diatomite, white carbon black, barium sulfate powder, kaolin and wollastonite; and / or The auxiliary agent is selected from one or more of dispersant, defoaming agent, wetting agent, thickening agent and pigment.

[0010] As an improvement of the above technical solution, the inorganic binder is selected from sodium water glass or potassium water glass, the modulus of which is 2.1-3.5, and the density is 1.3-1.6g / cm -3 ; and / or The inorganic filler is selected from heavy calcium, talc powder and mica powder; and / or The auxiliary agent is selected from one or more of sodium hexametaphosphate, sodium polyacrylate, cellulose, bentonite, xanthan gum, magnesium lithium silicate and magnesium aluminum silicate.

[0011] As an improvement of the above technical solution, the weight ratio of heavy calcium, talc powder and mica powder in the inorganic filler is (4-6):(1.5-4):1; The fineness of the heavy calcium is 700-900 mesh, the particle size of the talc powder is 1200-1300 mesh, and the particle size of the mica powder is 250-400 mesh.

[0012] Correspondingly, the application also discloses a preparation method of the antibacterial interior wall coating. uniformly mixing the inorganic filler, water and the inorganic binder; adding the functional powder and uniformly mixing; adding the auxiliary agent and uniformly mixing, thereby obtaining the antibacterial interior wall coating.

[0013] In the step of uniformly mixing the inorganic filler, water and the inorganic binder, the stirring speed is 300-500 rpm; In the step of adding the functional powder and uniformly mixing, the stirring speed is 1200-1500 rpm; In the step of adding the auxiliary agent and uniformly mixing, the stirring speed is 300-500 rpm.

[0014] The application has the following beneficial effects: The antibacterial interior wall coating in the embodiment of the application is obtained by compounding the functional powder of the modified tourmaline and the zinc-loaded mesoporous silica to which the silane coupling agent is introduced. Based on the antibacterial interior wall coating, the weak electric field and the far infrared radiation generated by the tourmaline can excite the water molecules in the air, thereby providing continuous power for releasing negative oxygen ions; meanwhile, the electric field environment makes the Zn 2+ The sustained release enhances the interaction with the bacterial cell membrane, thereby realizing the dual antibacterial mechanism of "electric field catalysis + metal ion sterilization", and the antibacterial efficiency is significantly higher than that of a single component. The modified tourmaline and the zinc-loaded mesoporous silica (Zn-MSNs) are connected through the "bridging" action of the silane coupling agent, thereby forming a stable composite structure; this not only solves the agglomeration problem of the nanoparticles, but also prevents the premature loss of the functional components, thereby ensuring the long-term effectiveness of the coating function. The mesoporous silica is used as the loading matrix, and the compatibility of the mesoporous silica with the inorganic binder is good, thereby avoiding the defects and performance decline of the coating layer caused by the compatibility problem. The antibacterial interior wall coating is mainly composed of inorganic materials, and does not contain organic volatile substances, thereby being green and environmentally friendly. The cost of zinc is lower than that of silver, and there is no discoloration risk. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below. It should be noted that the reagents used in the examples can be purchased from commercial channels if not otherwise specified.

[0016] The application provides an antibacterial interior wall coating, which comprises the following components in parts by weight: inorganic binder 30-50 parts, functional powder 5-15 parts, inorganic filler 20-50 parts, auxiliary agent 1-5 parts and water 15-25 parts. The functional powder is obtained by compounding silane coupling agent modified tourmaline and zinc-loaded mesoporous silica. Based on the above-mentioned antibacterial interior wall coating, on the one hand, the weak electric field and far infrared radiation generated by the tourmaline can excite water molecules in the air, providing continuous power for the release of negative oxygen ions; at the same time, the electric field environment makes the Zn 2+ The dual antibacterial mechanism of "electric field catalysis + metal ion sterilization" is realized, and the antibacterial efficiency is significantly higher than that of a single component. On the other hand, the modified tourmaline and the zinc-loaded mesoporous silica (Zn-MSNs) are connected through the "bridging" action of the silane coupling agent to form a stable composite structure; this not only solves the problem of nanoparticle agglomeration, but also prevents the premature loss of functional components, ensuring the long-term effectiveness of the coating function. Thirdly, mesoporous silica is used as the loading matrix, which has good compatibility with inorganic binders, avoiding defects and performance degradation caused by compatibility problems. Fourthly, the antibacterial interior wall coating is mainly composed of inorganic materials, which is green and environmentally friendly. Moreover, zinc is less expensive than silver, and there is no risk of discoloration.

[0017] Specifically, the inorganic binder can provide bonding force, ensuring that the inorganic coating can be firmly attached to substrates such as concrete, gypsum board, and brick walls, preventing peeling, cracking, or peeling. At the same time, the inorganic binder also endows the coating with the advantages of high strength, air permeability, mildew resistance, and low VOC, and can also play a role in resisting high temperature and corrosion. Specifically, the inorganic binder is selected from one or more of gypsum, cement, silica sol, phosphate sol, or borate sol, but is not limited thereto. Preferably, the inorganic binder is selected from silica sol, phosphate sol, or borate sol. More preferably, the inorganic binder is selected from sodium water glass or potassium water glass, which has a modulus of 2.1-3.5 and a density of 1.3-1.6 g / cm -3 The compatibility of this inorganic binder with the functional powder is stronger, which can effectively improve the adhesion and durability of the coating. At the same time, the sodium water glass or potassium water glass forms a three-dimensional network structure during the solidification process, further enhancing the compactness and permeation resistance of the coating, thereby improving the persistence of the antibacterial components.

[0018] For example, the amount of inorganic binder in the antibacterial interior wall coating is 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, or 48 parts, but is not limited thereto.

[0019] Specifically, the functional powder is obtained by compounding silane coupling agent modified tourmaline and zinc-loaded mesoporous silica. Both of them can play a synergistic role, greatly optimizing the antibacterial effect and antibacterial persistence. For example, the amount of functional powder in the antibacterial interior wall coating is 5.5 parts, 7 parts, 8.5 parts, 10 parts, 11.5 parts, 13 parts, or 14 parts, but is not limited thereto.

[0020] Specifically, the silane coupling agent can react with the hydroxyl group in the tourmaline to form a complex with the zinc-loaded mesoporous silica. Specifically, the silane coupling agent can be an amino silane coupling agent, a methoxy silane coupling agent, an ethoxy silane coupling agent, an acryloyloxy silane coupling agent, but is not limited thereto. Preferably, in some embodiments, the silane coupling agent is an amino silane coupling agent, such as KH-550, KH-792, and the like, but is not limited thereto. The amino silane coupling agent not only can enhance the interfacial bonding force by condensation reaction between the amino group and the hydroxyl group on the surface of the zinc-loaded mesoporous silica, but also can promote the surface activation of the tourmaline in an alkaline environment, thereby improving the compatibility between the tourmaline and the inorganic adhesive.

[0021] Specifically, the average particle size (i.e., D50) of the tourmaline in the silane coupling agent-modified tourmaline is 1-10 μm, preferably 1-5 μm, and more preferably 1-3 μm.

[0022] Specifically, the mesoporous silica in the zinc-loaded mesoporous silica has a high specific surface area and a uniform pore structure, and can effectively load zinc ions and control the slow release of the zinc ions, thereby achieving long-acting antibacterial effect. Specifically, the specific surface area of the zinc-loaded mesoporous silica is ≥800 m 2 / g, and the loading amount of zinc is 0.5-1.5 wt%. The specific surface area of the zinc-loaded mesoporous silica is ≥800 m 2 / g, and the loading amount of zinc is 0.8-1.5 wt%. The zinc-loaded mesoporous silica can achieve sustained release of active zinc ions, effectively inhibit various bacteria, and has good stability.

[0023] Specifically, in some embodiments, the preparation method of the functional powder is as follows: The silane coupling agent-modified tourmaline and the zinc-loaded mesoporous silica are dispersed in water, and reacted at 50-80 °C for 2-8 h, and then solid-liquid separation is performed to obtain an intermediate product; The intermediate product is calcined at 300-400 °C for 1-3 h to obtain the functional powder. Preferably, in some embodiments, the weight ratio of the silane coupling agent-modified tourmaline to the zinc-loaded mesoporous silica is (6-8):(2-4).

[0024] Based on the above preparation method, the tourmaline and the zinc 2+ can be well compounded, so that the two can play a synergistic effect and greatly improve the antibacterial effect.

[0025] Specifically, the inorganic filler in the antibacterial interior wall coating mainly plays a role of supporting framework, which can improve the hiding power of the coating and the mechanical properties of the hardness and wear resistance of the coating. Specifically, the inorganic filler is selected from one or more of heavy calcium, talcum powder, mica powder, diatomite, white carbon black, barium sulfate powder, kaolin, and wollastonite, but not limited to. Preferably, in some factual ways, the inorganic filler is selected from heavy calcium, talcum powder, and mica powder; wherein the heavy calcium provides high filling amount and excellent hiding support, the talcum powder enhances the wear resistance and anti-settling properties of the coating, and the mica powder significantly improves the barrier property and anti-permeability of the paint film due to its lamellar structure, further prolonging the durability of the antibacterial component. The three can effectively improve the compactness, crack resistance and antibacterial performance durability of the coating.

[0026] More preferably, the weight ratio of heavy calcium, talcum powder, and mica powder in the inorganic filler is (4-6):(1.5-4):1; the fineness of heavy calcium is 700-900 mesh, the particle size of talcum powder is 1200-1300 mesh, and the particle size of mica powder is 250-400 mesh.

[0027] Specifically, the amount of inorganic filler in the antibacterial interior wall coating is 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, or 38 parts, but not limited to.

[0028] Specifically, the auxiliary agent in the antibacterial interior wall coating is selected from one or more of dispersants, defoamers, wetting agents, thickening agents, and pigments, but not limited to. The auxiliary agent is a dispersant and a thickening agent, wherein the dispersant can assist the dispersion of inorganic powder and functional powder, further improving the antibacterial durability. The thickening agent can adjust the viscosity of the antibacterial interior wall coating to prevent sagging during construction, making the construction easier. More specifically, in some embodiments, the dispersant is selected from one or more of sodium hexametaphosphate, sodium polyacrylate, and polyoxyethylene ether, and the thickening agent is selected from one or more of cellulose, bentonite, xanthan gum, magnesium lithium silicate, and magnesium aluminum silicate.

[0029] Specifically, the amount of auxiliary agent in the antibacterial interior wall coating is 1.4 parts, 1.8 parts, 2.2 parts, 2.6 parts, 3 parts, 3.4 parts, 3.8 parts, 4.2 parts, or 4.6 parts.

[0030] Specifically, the amount of water in the antibacterial interior wall coating is 15.5 parts, 17 parts, 18.5 parts, 20 parts, 21.5 parts, 23 parts, or 24.5 parts, but not limited to.

[0031] Preferably, in some embodiments, the antibacterial interior wall coating comprises the following components by weight: inorganic binder 40-50 parts, functional powder 10-15 parts, inorganic filler 25-40 parts, auxiliary agent 1-5 parts, water 15-25 parts; More preferably, the antibacterial interior wall coating comprises the following components by weight: Inorganic binder 40~48 parts, functional powder 10~13 parts, inorganic filler 25~40 parts, auxiliary agent 3~5 parts, water 15~25 parts.

[0032] Specifically, the silane coupling agent modified tourmaline can be obtained by adding tourmaline into a silane coupling agent dispersion liquid and fully stirring, but is not limited thereto. Preferably, in some embodiments, the preparation method of the silane coupling agent modified tourmaline is as follows: The tourmaline is mixed with a modification liquid containing an amino silane coupling agent, and is ground for 1~3 hours to obtain the silane coupling agent modified tourmaline. The weight ratio of the tourmaline to the modification liquid containing the amino silane coupling agent is (0.5~2):100, and the concentration of the amino silane coupling agent in the solution containing the amino silane coupling agent is 1.5~5 wt%.

[0033] Based on the above preparation method, the tourmaline surface can be aminated through grinding for mechanical activation, and the bacteriostatic durability can be greatly improved.

[0034] Specifically, the zinc-loaded mesoporous silica can be obtained by mixing a solution containing Zn 2+ and mesoporous silica under alkaline conditions and stirring to fully load Zn 2+ in the mesoporous structure, but is not limited thereto. Preferably, in some embodiments, the preparation method of the zinc-loaded mesoporous silica is as follows: A template agent is added to water, TEOS and a zinc source are added, and the mixture is reacted under alkaline conditions at 10~40℃ for 4~8 hours to obtain an intermediate product. The intermediate product is calcined at 500~800℃ for 2~5 hours to obtain the zinc-loaded mesoporous silica. The molar ratio of Si in the TEOS to Zn in the zinc source is (5~10):1. The template agent is selected from one of Pluronic P123, F127 and CTAB, and the zinc source is selected from one or more of zinc nitrate or its hydrate, zinc chloride or its hydrate, zinc sulfate or its hydrate, and zinc acetate or its hydrate. Preferably, the template agent is CTAB, and the zinc source is zinc nitrate or its hydrate.

[0035] Based on the above preparation method, the slow-release effect of Zn 2+ can be strengthened, and the antibacterial durability can be effectively improved. At the same time, the overall particle size of the zinc-loaded mesoporous silica is small, so that it can be anchored on the surface of the tourmaline to form a stable composite structure, thereby further improving the synergistic effect of the two.

[0036] Correspondingly, the application also discloses a preparation method of the antibacterial interior wall coating. S1: uniformly mix the inorganic filler, water and inorganic binder; Specifically, in some embodiments, the stirring speed during mixing is 300-500 rpm.

[0037] S2: add the functional powder and mix uniformly; Specifically, in some embodiments, the stirring speed during mixing is 1200-1500 rpm.

[0038] S3: add the auxiliary agent and mix uniformly to obtain the product.

[0039] Specifically, in some embodiments, the stirring speed during mixing is 300-500 rpm.

[0040] The application is further described below with specific examples: Example 1 This example provides an antibacterial interior wall coating, the formula of which is as follows: 40 parts of inorganic binder, 12 parts of functional powder, 40 parts of inorganic filler, 3 parts of auxiliary agent and 20 parts of water; The inorganic binder is potassium water glass with a modulus of 3.1, the inorganic filler is a mixture of heavy calcium powder (800 mesh) and talc powder (1250 mesh) with a weight ratio of 5:3, and the auxiliary agent is a dispersant (sodium hexametaphosphate) and a thickening agent (magnesium aluminum silicate) with a weight ratio of 1:3.

[0041] The functional powder is a composite of silane coupling agent modified tourmaline and zinc-loaded mesoporous silica.

[0042] Specifically, the preparation method of the silane coupling agent modified tourmaline is as follows: 2 g of tourmaline (D50=2 μm) is added to a dispersion liquid containing 1 g of KH-550 and 50 g of ethanol, and stirred and mixed for 2 h to obtain the product.

[0043] The preparation method of the zinc-loaded mesoporous silica is as follows: 13 g of mesoporous silica is added to a 5 wt% zinc nitrate aqueous solution (100 mL) and stirred for 2 h, then filtered, washed and dried to obtain the zinc-loaded mesoporous silica.

[0044] The preparation method of the functional powder is as follows: the silane coupling agent modified tourmaline and the zinc-loaded mesoporous silica are dispersed in water, and reacted at 60°C for 4 h, then solid-liquid separation and drying to obtain an intermediate product; The intermediate product is calcined at 350°C for 2 h to obtain the product. The weight ratio of the silane coupling agent modified tourmaline to the zinc-loaded mesoporous silica is 10:1.

[0045] Example 2 The embodiment provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 1. The preparation method of the tourmaline modified by the silane coupling agent is as follows: 2g of tourmaline (D50=2um) is added into a dispersion liquid containing 1g of KH-550 and 50g of ethanol, and ball milling is carried out for 2h, and the tourmaline modified by the silane coupling agent is obtained.

[0046] The rest is the same as in the embodiment 1.

[0047] Embodiment 3 The embodiment provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 2. The preparation method of the zinc-loaded mesoporous silica is as follows: 2g of CTAB is dissolved in 100g of deionized water, 10g of ammonia water is added, and 10g of TEOS and 2g of zinc nitrate hexahydrate are slowly added in sequence under stirring, and the reaction is carried out at room temperature for 6h. The product is centrifuged, washed, calcined at 550 DEG C in a muffle furnace for 4h to remove the template, and the zinc-loaded mesoporous silica is obtained.

[0048] The rest is the same as in the embodiment 2.

[0049] Embodiment 4 The embodiment provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 3. The preparation method of the functional powder is as follows: the tourmaline modified by the silane coupling agent and the zinc-loaded mesoporous silica are dispersed into water, and the reaction is carried out at 60 DEG C for 4h, and the intermediate product is obtained through solid-liquid separation and drying; The intermediate product is calcined at 350 DEG C for 2h, and the functional powder is obtained; The weight ratio of the tourmaline modified by the silane coupling agent to the zinc-loaded mesoporous silica is 7:3.

[0050] The rest is the same as in the embodiment 3.

[0051] Embodiment 5 The embodiment provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 4. The inorganic filler is a mixture of heavy calcium powder (800 mesh), talc powder (1250 mesh) and mica powder (300 mesh), and the weight ratio of the three is 5:2:1.

[0052] The rest is the same as in the embodiment 4.

[0053] Comparative Example 1 The comparative example provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 5. The functional powder is not contained.

[0054] The rest is the same as in the embodiment 5.

[0055] Comparative Example 2 The comparative example provides an antibacterial interior wall coating which is different from the antibacterial interior wall coating in the embodiment 5. The tourmaline powder (D50=2 μm) and nano zinc oxide (D50=55 nm) were mixed directly in a weight ratio of 7:3 as the functional powder.

[0056] The rest were the same as example 5.

[0057] Comparative Example 3 This comparative example provides an antibacterial interior wall coating, which is different from example 5 in that: The tourmaline powder modified by silane coupling agent was used as the functional powder.

[0058] The rest were the same as example 5.

[0059] Comparative Example 4 This comparative example provides an antibacterial interior wall coating, which is different from example 5 in that: The zinc-loaded mesoporous silica was used as the functional powder.

[0060] The rest were the same as example 5.

[0061] Comparative Example 5 This comparative example provides an antibacterial interior wall coating, which is different from example 5 in that: The preparation method of the functional powder was as follows: the tourmaline powder (D50=2 μm) and nano zinc oxide (D50=55 nm) were mixed in a weight ratio of 7:3, 2 g of the mixture was added into a dispersion liquid containing 1 g of KH-550 and 50 g of ethanol, and then ball-milled for 2 h before drying.

[0062] The antibacterial interior wall coatings of example 1 to example 5 and comparative example 1 to comparative example 5 were detected, and the specific detection method was as follows: (1) The negative ion release concentration was tested according to the method of JC / T 2040-2010; (2) The antibacterial rate (against Staphylococcus aureus) and the antibacterial durability were tested according to the method of GB / T 218666-2008.

[0063] The specific test results are shown in the following table

[0064] The above is the preferred embodiment of the application. It should be noted that for those skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the application.

Claims

1. An antibacterial interior wall paint, characterized by, Comprise the following components by weight: inorganic binder 30~50 parts, functional powder 5~15 parts, inorganic filler 20~50 parts, auxiliary agent 1~5 parts, water 15~25 parts; The functional powder is a composite of silane coupling agent modified tourmaline and zinc-loaded mesoporous silica.

2. The antimicrobial interior wall coating of claim 1, wherein, The preparation method of the functional powder is: The silane coupling agent modified tourmaline and zinc-loaded mesoporous silica are dispersed in water, and reacted at 50~80℃ for 2~8h, and then solid-liquid separation is performed to obtain an intermediate product; The intermediate product is calcined at 300~400℃ for 1~3h, and the functional powder is obtained. The silane coupling agent is an amino silane coupling agent, and the weight ratio of the silane coupling agent modified tourmaline to the zinc-loaded mesoporous silica is (6~8):(2~4).

3. The antimicrobial interior wall coating of claim 1, wherein, The preparation method of the silane coupling agent modified tourmaline is: The tourmaline is mixed with a modification solution containing an amino silane coupling agent, and ground for 1~3h, and the silane coupling agent modified tourmaline is obtained. The weight ratio of the tourmaline to the modification solution containing the amino silane coupling agent is (0.5~2):100; the concentration of the amino silane coupling agent in the solution containing the amino silane coupling agent is 1.5~5wt%.

4. The antimicrobial interior wall coating of claim 1, wherein, The preparation method of the zinc-loaded mesoporous silica is: The template agent is added to water, TEOS and a zinc source are added, and the mixture is reacted under alkaline conditions at 10~40℃ for 4~8h to obtain an intermediate product; The intermediate product is calcined at 500~800℃ for 2~5h to obtain the zinc-loaded mesoporous silica. The molar ratio of Si in the TEOS to Zn in the zinc source is (5~10):

1. The template agent is selected from one of Pluronic P123, F127 and CTAB; the zinc source is selected from one or more of zinc nitrate or its hydrate, zinc chloride or its hydrate, zinc sulfate or its hydrate, and zinc acetate or its hydrate.

5. The antimicrobial interior wall coating of claim 4, wherein, The specific surface area of the zinc-loaded mesoporous silica is ≥ 800 m 2 / g, and the zinc loading is 0.5-1.5 wt%.

6. The antimicrobial interior wall coating of claim 1, wherein, The inorganic binder is selected from silica sol, phosphate sol or borate sol; and / or The inorganic filler is selected from one or more of heavy calcium, talcum powder, mica powder, diatomite, white carbon black, barium sulfate powder, kaolin and wollastonite; and / or The auxiliary agent is selected from one or more of dispersant, defoaming agent, wetting agent, thickening agent and pigment.

7. The antimicrobial interior wall coating of claim 1, wherein, The inorganic binder is selected from sodium water glass or potassium water glass, the modulus of which is 2.1-3.5, and the density is 1.3-1.6 g / cm -3 ; and / or The inorganic filler is selected from heavy calcium, talcum powder and mica powder; and / or The auxiliary agent is selected from one or more of sodium hexametaphosphate, sodium polyacrylate, cellulose, bentonite, xanthan gum, magnesium lithium silicate and magnesium aluminum silicate.

8. The antimicrobial interior wall coating of claim 7, wherein, The weight ratio of the heavy calcium, talcum powder and mica powder in the inorganic filler is (4~6):(1.5~4):1; The fineness of the heavy calcium is 700~900 mesh, the particle size of the talcum powder is 1200~1300 mesh, and the particle size of the mica powder is 250~400 mesh.

9. A method for producing an antibacterial interior wall paint, for producing the antibacterial interior wall paint according to any one of claims 1 to 8, characterized by, Comprise: Mix the inorganic filler, water and inorganic binder uniformly; Add the functional powder and mix uniformly; Add the auxiliary agent and mix uniformly, and the inorganic adhesive is obtained.

10. The method of claim 9, wherein the antimicrobial interior wall paint is prepared by adding the antimicrobial agent to the base paint. 5 In the step of mixing the inorganic filler, water and inorganic binder uniformly, the stirring speed is 300~500rpm; In the step of adding the functional powder and mixing uniformly, the stirring speed is 1200~1500rpm; In the step of adding the auxiliary agent and mixing uniformly, the stirring speed is 300~500rpm.

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