Preparation process of an antibacterial diatom board

Abstract

The present invention provides an antibacterial diatom board. The antibacterial algae mud board is a multi-layer composite algae mud board, which is composed of multiple layers of sheet materials. The antibacterial algae mud board is divided into an outer surface layer and a core layer. The outer surface layer is the two outer surface layers of the antibacterial algae mud board, and the core layer is the middle layer between the two outer surface layers. The outer surface layer of the antibacterial algae mud board is made of slurry A, and the slurry A contains ZnO-attapulgite. The core layer of the antibacterial algae mud board is made of slurry B, and the slurry B contains Ag-ZnO nanowires. By means of the reasonable combination of the outer surface layer and the core layer, the high antibacterial and bacteriostatic properties of the algae mud board are realized, solving the problems of existing antibacterial materials being bulky, fragile, and generating a large amount of construction waste. At the same time, the antibacterial value is greatly improved, and it can be widely applied in the fields of indoor decoration and renovation, environmental protection, energy conservation, and daily necessities, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of decorative materials, and particularly relates to a preparation process of an antibacterial diatom board. Background Art

[0002] Diatomaceous earth is a biogenic siliceous sedimentary rock formed from the remains of ancient diatoms. It not only has the advantages of high melting point, strong corrosion resistance, and good chemical stability of inorganic non-metallic materials, but also has excellent sound insulation, dehumidification, light weight, and indoor air purification characteristics. It is a rare green environmental protection material and is widely used in the preparation of functional materials such as health, environmental protection, and energy conservation.

[0003] In recent years, due to its good performance and excellent functions, the diatom board, as a new type of functional wall surface, has been widely used in the field of interior wall decoration of buildings. However, due to the continuous improvement of the indoor airtightness of modern buildings, most living and working environments are in a closed state, and molds are likely to grow on the surface of the diatom board, resulting in serious residue of these pollutants and being difficult to remove, posing a great threat to the health of indoor personnel. Based on this, we provide a preparation process of an antibacterial diatom board with a specific ingredient formula. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies in the application of existing diatom board technologies, the purpose of the present invention is to provide a preparation process of an antibacterial diatom board, which solves the problem of insufficient antibacterial performance of existing diatom boards. The diatom board prepared by the present invention has excellent antibacterial functions and can be widely used in fields such as indoor decoration, environmental protection, energy conservation, and daily necessities.

[0006] (II) Technical Solutions

[0007] To solve the above problems, the present invention provides an antibacterial diatom board: the antibacterial diatom mud board is a multi-layer composite diatom mud board, which is composed of multiple board material layers; the antibacterial diatom mud board is divided into an outer surface layer and a core layer. The outer surface layer is the two outer surface layers on both sides of the antibacterial diatom mud board, and the core layer is the middle layer between the two outer surface layers. The outer surface layer of the antibacterial diatom mud board is made of slurry A, and the slurry A contains ZnO-attapulgite. The core layer of the antibacterial diatom mud board is made of slurry B, and the slurry B contains Ag-ZnO nanowires. It should be particularly noted that the middle layer between the two outer surface layers can be composed of multiple core layers.

[0008] The formula of the slurry A mainly includes the following raw materials in parts by weight: 40-50 parts of diatomaceous earth, 15-30 parts of cement, 15-18 parts of resin, 10-15 parts of kaolin, 8-10 parts of quartz sand, 8-12 parts of ZnO-attapulgite material, 1-5 parts of dispersant, 0.1-1 part of thickener, and 1-3 parts of defoamer.

[0009] The formulation of the slurry B mainly includes the following raw materials in parts by weight: 30-40 parts of diatomite, 16-20 parts of cement, 12-18 parts of resin, 8-12 parts of kaolin, 6-12 parts of quartz sand, 6-10 parts of Ag-ZnO nanowires, 1-3 parts of dispersant, 0.8-2 parts of thickener, and 2-5 parts of defoamer.

[0010] Preferably, the Ag-ZnO nanowires are composite nanowires with a diameter of 50-400 nm, and the ZnO-attapulgite is a composite material prepared by solid-phase ion exchange.

[0011] The present invention also provides a preparation process for the antibacterial diatomite board described in the above technical solution, including the following steps:

[0012] Step 1: Prepare Ag-ZnO nanowires: Add ammonia water and polyethylene glycol 4000 to the zinc nitrate solution in sequence to obtain a reaction solution; then transfer the reaction solution to a reaction kettle and place it in an electrothermal blast drying oven for heating. After cooling to room temperature, separate, wash, and dry the precipitate in the reaction kettle to obtain ZnO nanowires; activate the ZnO nanowires in a stannous chloride solution, wash them, and disperse the ZnO nanowires in a mixed solution of ethanol / deionized water to obtain a suspension. Add silver nitrate solution and polyvinylpyrrolidone (PVP-K45) / methanol solution to the suspension in sequence to obtain a precipitate, and obtain Ag-ZnO nanowires after washing and drying.

[0013] Step 2: Prepare ZnO-attapulgite material: Place attapulgite in a sintering furnace at 300 °C for activation. After cooling, uniformly mix zinc nitrate and attapulgite according to a certain mass ratio, and then place the mixed sample in a sintering furnace for calcination. After cooling, obtain the ZnO-attapulgite material.

[0014] Step 3: Prepare the antibacterial diatomite board:

[0015] Step 3.1: Weigh a certain amount of raw materials such as diatomite, cement, kaolin, and quartz sand according to the ingredient list, and mix them evenly at room temperature with a mixer. After mixing evenly, obtain mixed dry powder A and mixed dry powder B.

[0016] Step 3.2: Stir the resin, dispersant, defoamer, thickener, and water evenly, then add them to the mixed dry powder prepared in Step 3.1 and the Ag-ZnO nanowires (or ZnO-attapulgite material) and mix and stir. After mixing evenly, flow through the outlet onto the demolding cloth, and form a slab after extrusion and dehydration. Perform a layered demolding, drying, and static treatment to obtain slab A and slab B.

[0017] Step 3.3: Place slab A and slab B in a molding die as needed, add the corresponding coatings, and perform high-temperature autoclave treatment. After grinding and curing, obtain a diatomite board with antibacterial function.

[0018] Preferably, the concentration of the zinc nitrate solution is 0.2 - 0.3 mol / L, the concentrations of the added ammonia water and polyethylene glycol 4000 are 0.4 - 0.6 mol / L and 0.08 - 0.12 mol / L respectively, the heat preservation temperature in the electrothermal blast drying oven is 160 - 180 °C, and the heat preservation time is 15 - 18 h.

[0019] Preferably, the concentration of the stannous chloride solution is 0.05 - 0.1 mol / L, the content of ZnO nanowires in the ZnO nanowire suspension is 15 - 20 g / L. The concentration of the added silver nitrate solution is 0.1 - 0.15 mol / L, and the content of PVP-K45 in the PVP-K45 / methanol solution is 40 - 50 g / L.

[0020] Preferably, the mixing ratio of hydrated zinc nitrate to attapulgite is 0.15 - 0.3:1, and the calcination process in the sintering furnace is: the heat preservation temperature is 400 - 500 °C, and the heat preservation time is 2 - 4 h.

[0021] Preferably, the mixing speed of the mixed dry powder A and the mixed dry powder B is: 2000 - 2500 r / min, and the mixing time is 30 - 40 min.

[0022] Preferably, the mass of water is 50% - 55% of the raw materials of the diatomite board.

[0023] Preferably, the parameters of the autoclaving process are: the temperature is 150 - 180 °C, the pressure value is 1.2 - 1.4 MPa, and the autoclaving curing time is 12 - 15 h.

[0024] (III) Compared with the prior art, the beneficial effects of the method of the present invention are:

[0025] The present invention provides an antibacterial diatomite board: the antibacterial diatomite board is a multi-layer composite diatomite board, which is composed of multiple board material layers; the antibacterial diatomite board is divided into an outer surface layer and a core layer. The outer surface layer is the outer surface layer on both sides of the antibacterial diatomite board, and the core layer is the intermediate layer between the two outer surface layers. The outer surface layer of the antibacterial diatomite board is made of slurry A, and the slurry A contains ZnO-attapulgite. The core layer of the antibacterial diatomite board is made of slurry B, and the slurry B contains Ag-ZnO nanowires; specifically, the intermediate layer between the two outer surface layers can be composed of multiple core layers.

[0026] The multi-layer composite algal mud board prepared by the present invention using a specific formula has very excellent antibacterial and bacteriostatic capabilities. The outer layer is relatively dry and ventilated, and the ability to breed bacteria on the surface is relatively low. The nano-ZnO particles contained in the ZnO-attapulgite in the outer layer have relatively excellent bactericidal and bacteriostatic effects. Under ultraviolet light irradiation, the electrons in the valence band of nano-ZnO will be excited to the conduction band, forming freely moving electrons with negative charges and holes with positive charges. These holes react with oxygen, hydroxyl groups, water, etc. adsorbed on the material surface to generate hydroxyl radicals, oxygen anions, hydrogen peroxide, etc. with reducing effects, such as hydroxyl radicals and reactive oxygen ions. It can stimulate oxygen in the air and water to become reactive oxygen, which has extremely strong oxidation activity. They can react with organic substances (such as hydroxyl groups, etc.) in various microorganisms, destroy the proliferation ability of bacterial cells, and inhibit or kill bacteria. The ability to breed bacteria in the core layer is relatively strong. Ag-ZnO nanowires are added to the core layer. By reasonably matching Ag-ZnO nanowires and diatomaceous earth, the released ions are highly reactive. They can bind to tissue proteins and change the structure of the bacterial cell wall and nuclear membrane, destroy the membrane protein structure, make it lose its activity, and the inside and outside of the membrane cannot be normally polarized, hindering the molecular transport required to maintain normal cell operation, causing the cell to lack nutrients, resulting in cell deformation and death. By reasonably matching the outer layer and the core layer, the high antibacterial and bacteriostatic properties of the algal mud board are achieved, solving the problems of existing antibacterial materials being bulky, fragile, and generating a large amount of construction waste. At the same time, the antibacterial value is greatly improved, and it can be widely used in the fields of indoor decoration and renovation, environmental protection, energy conservation, and daily necessities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic structural diagram of an antibacterial diatom board of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] The preparation process of an antibacterial diatom board of the present invention is specifically implemented according to the following steps:

[0031] Step 1: Prepare Ag-ZnO nanowires;

[0032] Step 2: Prepare ZnO-attapulgite materials;

[0033] Step 3: Prepare the antibacterial diatomite board.

[0034] The features of the present invention also lie in:

[0035] The specific process in Step 1 is as follows:

[0036] Step 1.1: Dissolve zinc nitrate hydrate in deionized water to obtain a zinc nitrate solution with a concentration of 0.2 - 0.3 mol / L. Sequentially add 0.4 - 0.6 mol / L ammonia water and 0.08 - 0.12 mol / L polyethylene glycol 4000 to the zinc nitrate solution to obtain a reaction solution.

[0037] Step 1.2: Transfer the reaction solution to a reaction kettle and keep it at 160 - 180 °C in an electrothermal blast drying oven for 15 - 18 h. After cooling to room temperature, perform centrifugal separation. Wash the precipitate with anhydrous ethanol and deionized water successively, and then dry it at 70 - 85 °C to constant weight to obtain ZnO nanowires.

[0038] Step 1.3: Add the ZnO nanowires to a 0.05 - 0.1 mol / L stannous chloride solution and stir to mix. Then, after washing multiple times, obtain sensitized ZnO nanowires; Disperse the ZnO nanowires in an ethanol / deionized water mixed solution to obtain a suspension with a ZnO nanowire content of 15 - 20 g / L.

[0039] Step 1.4: Add a 0.1 - 0.15 mol / L silver nitrate solution to the suspension, and magnetically stir a PVP - K45 / methanol solution with a PVP - K45 content of 40 - 50 g / L for 3 - 4 h to obtain a precipitate. After washing and drying, obtain Ag - ZnO nanowires.

[0040] The specific process in Step 2 is as follows:

[0041] Step 2.1: Place attapulgite in a sintering furnace at 300 °C for activation. After cooling, uniformly mix zinc nitrate hydrate and attapulgite according to a mass ratio of 0.15 - 0.3:1.

[0042] Step 2.2: Place the mixture prepared in Step 2.1 in a sintering furnace and calcine it at 400 - 500 °C for 2 - 4 h. After cooling, obtain the ZnO - attapulgite material.

[0043] The specific process in Step 3 is as follows:

[0044] Step 3.1: Weigh a certain amount of raw materials such as diatomite, cement, kaolin, and quartz sand according to the ingredient list, and stir them with a stirrer for 30 - 40 min at a rotation speed of 2000 - 2500 r / min to uniformly mix the various raw materials at room temperature. After uniform mixing, obtain mixed dry powder A and mixed dry powder B;

[0045] Step 3.2: Mix the resin, dispersant, defoamer, thickener, and water (where the mass of water is 50%-55% of the raw materials of the diatom board) and increase the temperature to 85°C at a rate of 5°C / s and stir for 30 minutes. Then, add the mixed dry powder prepared in Step 3.1 and Ag-ZnO nanowires (or ZnO-attapulgite materials) at this temperature and stir for 30 minutes. After mixing evenly, flow it onto the demoulding cloth through the outlet, form a slab after extrusion and dehydration, and carry out hierarchical demoulding, drying, and static treatment to obtain Blank A and Blank B;

[0046] Step 3.3: Place Blank A and Blank B in the forming mold as required, add the corresponding coatings, and carry out high-temperature autoclaving treatment. During high-temperature autoclaving, the temperature is 150-180°C, the pressure value is 1.2-1.4 MPa, and the autoclaving curing time is 12-15 h. After grinding and curing, a diatom board with antibacterial function is obtained.

[0047] Example 1

[0048] A preparation process of an antibacterial diatom board is specifically implemented according to the following steps:

[0049] The specific process in Step 1 is as follows:

[0050] Step 1.1: Dissolve zinc nitrate hexahydrate in deionized water to obtain a zinc nitrate solution with a concentration of 0.2 mol / L. Add 0.4 mol / L ammonia water and 0.08 mol / L polyethylene glycol 4000 to the zinc nitrate solution in sequence to obtain a reaction solution.

[0051] Step 1.2: Transfer the reaction solution to a reaction kettle and keep it at 160°C in an electrothermal blast drying oven for 15 h. After cooling to room temperature, carry out centrifugal separation. The precipitate is washed with anhydrous ethanol and deionized water in sequence and then dried to constant weight at 70°C to obtain ZnO nanowires.

[0052] Step 1.3: Add the ZnO nanowires to a 0.05 mol / L stannous chloride solution and stir to mix. Then, obtain sensitized ZnO nanowires after washing multiple times; Disperse the ZnO nanowires in an ethanol / deionized water mixed solution to obtain a suspension with a ZnO nanowire content of 15 g / L.

[0053] Step 1.4: Add a 0.1 mol / L silver nitrate solution and a PVP-K45 / methanol solution with a PVP-K45 content of 40 g / L to the suspension and stir magnetically for 3 h to obtain a precipitate. After washing and drying, Ag-ZnO nanowires are obtained.

[0054] The specific process in Step 2 is as follows:

[0055] Step 2.1: Activate attapulgite in a sintering furnace at 300 °C. After cooling, uniformly mix zinc nitrate hexahydrate and attapulgite in a mass ratio of 0.15:1.

[0056] Step 2.2: Place the mixture prepared in Step 2.1 in a sintering furnace and calcine it at 400 °C for 2 h. After cooling, obtain the ZnO-attapulgite material.

[0057] The specific process in Step 3 is as follows:

[0058] Step 3.1: Weigh a certain amount of raw materials such as diatomite, cement, kaolin, and quartz sand according to the ingredient list, and stir them in a blender for 30 min at a rotation speed of 2000 r / min to uniformly mix the raw materials at room temperature. After uniform mixing, obtain mixed dry powder A and mixed dry powder B.

[0059] Step 3.2: Add resin, dispersant, defoamer, thickener, and water (where the mass of water is 50% of the raw materials of the diatom board) and mix and stir them while heating at a rate of 5 °C / s to 85 °C for 30 min. Subsequently, add the mixed dry powder prepared in Step 3.1 and Ag-ZnO nanowires (or ZnO-attapulgite material) at this temperature and mix and stir for 30 min. After uniform mixing, flow through the outlet onto the demoulding cloth, and form a slab blank after extrusion and dehydration. Then, perform a layered demoulding, drying, and static treatment to obtain slab blank A and slab blank B.

[0060] Step 3.3: Place slab blank A and slab blank B in a molding die as needed, add the corresponding coating, and perform high-temperature autoclave treatment. During high-temperature autoclaving, the temperature is 150 °C, the pressure value is 1.2 MPa, and the autoclave curing time is 12 h. After grinding and curing, obtain a diatom board with antibacterial function.

[0061] Example 2

[0062] A preparation process of an antibacterial diatom board is specifically implemented according to the following steps:

[0063] The specific process in Step 1 is as follows:

[0064] Step 1.1: Dissolve zinc nitrate hexahydrate in deionized water to obtain a zinc nitrate solution with a concentration of 0.25 mol / L. Add 0.5 mol / L ammonia water and 0.10 mol / L polyethylene glycol 4000 to the zinc nitrate solution in sequence to obtain a reaction solution.

[0065] Step 1.2: Transfer the reaction solution to a reaction kettle and keep it at 170 °C in an electrothermal blast drying oven for 16 h. After cooling to room temperature, perform centrifugal separation. Wash the precipitate with absolute ethanol and deionized water in sequence and dry it at 80 °C to constant weight to obtain ZnO nanowires.

[0066] Step 1.3: Add ZnO nanowires to a 0.75 mol / L stannous chloride solution, stir and mix, and then obtain sensitized ZnO nanowires after washing multiple times; disperse the ZnO nanowires in a mixed solution of ethanol / deionized water to obtain a suspension with a ZnO nanowire content of 18 g / L.

[0067] Step 1.4: Add a 0.12 mol / L silver nitrate solution and a PVP-K45 / methanol solution with a PVP-K45 content of 45 g / L to the suspension, stir magnetically for 3 h, obtain a precipitate, and obtain Ag-ZnO nanowires after washing and drying.

[0068] The specific process in Step 2 is as follows:

[0069] Step 2.1: Place attapulgite in a sintering furnace at 300 °C for activation, and after cooling, uniformly mix zinc nitrate hydrate and attapulgite according to a mass ratio of 0.2:1.

[0070] Step 2.2: Place the mixture prepared in Step 2.1 in a sintering furnace, calcine at 450 °C for 3 h, and cool to obtain a ZnO-attapulgite material.

[0071] The specific process in Step 3 is as follows:

[0072] Step 3.1: Weigh a certain amount of raw materials such as diatomite, cement, kaolin, and quartz sand according to the ingredient list, stir with a mixer for 35 min at a rotation speed of 2200 r / min to uniformly mix the raw materials at room temperature, and obtain mixed dry powder A and mixed dry powder B after uniform mixing.

[0073] Step 3.2: Add resin, dispersant, defoamer, thickener, and water (where the mass of water is 52% of the raw materials of the diatom board), heat up to 85 °C at a heating rate of 5 °C / s, mix and stir for 30 min, then add the mixed dry powder prepared in Step 3.1 and Ag-ZnO nanowires (or ZnO-attapulgite material) at this temperature, mix and stir for 30 min, and after uniform mixing, flow through the outlet onto the demoulding cloth, form a slab blank after extrusion and dehydration, and carry out a layered demoulding, drying, and static treatment to obtain slab blank A and slab blank B.

[0074] Step 3.3: Place slab blank A and slab blank B in a molding die as needed, add the corresponding coating, and carry out high-temperature autoclaving treatment. During high-temperature autoclaving, the temperature is 160 °C, the pressure value is 1.3 MPa, and the autoclaving curing time is 14 h. After grinding and curing, obtain a diatom board with antibacterial function.

[0075] Example 3

[0076] A preparation process of an antibacterial diatom board is specifically implemented according to the following steps:

[0077] The specific process in Step 1 is as follows:

[0078] Step 1.1: Dissolve zinc nitrate hexahydrate in deionized water to obtain a zinc nitrate solution with a concentration of 0.3 mol / L. Sequentially add 0.6 mol / L ammonia water and 0.12 mol / L polyethylene glycol 4000 to the zinc nitrate solution to obtain a reaction solution.

[0079] Step 1.2: Transfer the reaction solution to a reaction kettle and keep it at 180 °C in an electrothermal blast drying oven for 18 h. After cooling to room temperature, perform centrifugal separation. Wash the precipitate successively with absolute ethanol and deionized water, and then dry it at 85 °C to constant weight to obtain ZnO nanowires.

[0080] Step 1.3: Add the ZnO nanowires to a 0.1 mol / L stannous chloride solution and stir to mix. Then, after washing multiple times, obtain sensitized ZnO nanowires; Disperse the ZnO nanowires in a mixed solution of ethanol / deionized water to obtain a suspension with a ZnO nanowire content of 20 g / L.

[0081] Step 1.4: Add a 0.15 mol / L silver nitrate solution and a PVP-K45 / methanol solution with a PVP-K45 content of 50 g / L to the suspension and stir magnetically for 4 h to obtain a precipitate. After washing and drying, obtain Ag-ZnO nanowires.

[0082] The specific process in Step 2 is as follows:

[0083] Step 2.1: Place attapulgite in a sintering furnace at 300 °C for activation. After cooling, uniformly mix zinc nitrate hexahydrate and attapulgite according to a mass ratio of 0.3:1.

[0084] Step 2.2: Place the mixture prepared in Step 2.1 in a sintering furnace and calcine it at 500 °C for 4 h. After cooling, obtain the ZnO-attapulgite material.

[0085] The specific process in Step 3 is as follows:

[0086] Step 3.1: Weigh a certain amount of raw materials such as diatomite, cement, kaolin, and quartz sand according to the ingredient list, and stir them with a stirrer for 40 min at a rotation speed of 2500 r / min to uniformly mix the raw materials at room temperature. After uniform mixing, obtain mixed dry powder A and mixed dry powder B;

[0087] Step 3.2: Put resin, dispersant, defoamer, thickener and water (where the mass of water is 55% of the raw materials of the diatom board) and heat them at a heating rate of 5 °C / s to 85 °C, then mix and stir for 30 min. Subsequently, add the mixed dry powder prepared in Step 3.1 and Ag-ZnO nanowires (or ZnO-attapulgite materials) at this temperature and mix and stir for 30 min. After mixing evenly, let it flow onto the demoulding cloth through the outlet, form a slab after extrusion and dehydration, and carry out hierarchical demoulding, drying and static treatment to obtain blank A and blank B;

[0088] Step 3.3: Place blank A and blank B in the molding die as required, add the corresponding coating, and carry out high-temperature autoclaving treatment. During high-temperature autoclaving, the temperature is 180 °C, the pressure value is 1.4 MPa, and the autoclaving curing time is 15 h. After grinding and curing, a diatom board with antibacterial function is obtained.

[0089] Test the antibacterial properties of the diatom boards in the above three embodiments of the present invention according to the national standard HG / T3950-2007. Calculate the antibacterial rate R(%) according to the following formula: R(%)=(C 空 -C 样 ) / C 空 , and the performance test comparison results are shown in Table 1.

[0090] The multi-layer composite diatom mud board prepared by the present invention using a specific formula has very excellent antibacterial and bacteriostatic capabilities. The outer layer is relatively dry and ventilated, and the ability to breed bacteria on the surface is relatively low. The nano-ZnO particles contained in the ZnO-attapulgite in the outer layer have relatively excellent bactericidal and bacteriostatic effects. Under ultraviolet light irradiation, electrons in the valence band of nano-ZnO will be excited to the conduction band, forming freely moving electrons with negative charges and holes with positive charges. These holes react with oxygen, hydroxyl groups, water, etc. adsorbed on the material surface to generate hydroxyl radicals and reactive oxygen ions with reducing effects such as hydroxyl radicals, oxygen anions, and hydrogen peroxide. It can stimulate oxygen in the air and water to become reactive oxygen, and reactive oxygen has extremely strong oxidation activity. They can react with organic substances (such as hydroxyl groups, etc.) in various microorganisms, destroy the proliferation ability of bacterial cells, and inhibit or kill bacteria. The ability to breed bacteria in the middle layer is relatively strong. Ag-ZnO nanowires are added to the middle layer. By reasonably matching Ag-ZnO nanowires and diatomaceous earth, the released ions are highly reactive. They can combine with tissue proteins and change the structure of the bacterial cell wall and nuclear membrane, destroy the membrane protein structure, make it lose its activity, and the inside and outside of the membrane cannot be normally polarized, hindering the molecular transport required to maintain the normal operation of the cell, making the cell lack nutrients, resulting in cell deformation and death. As can be seen from Table 1, the diatom boards prepared in the three embodiments of the present invention have antibacterial properties against Escherichia coli and Staphylococcus aureus that meet the standard requirements and have excellent antibacterial capabilities.

[0091] Table 1:

[0092]

[0093] In summary, the present invention provides a preparation process of an antibacterial diatom board. The obtained diatom board has made remarkable progress in antibacterial properties against Escherichia coli and Staphylococcus aureus, and provides a beneficial guidance for subsequent development and research work, with strong enlightenment significance.

[0094] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0095] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An antibacterial diatom board: The antibacterial diatom board is a multi-layer composite diatom mud board, which is composed of multiple layers of board materials; the antibacterial diatom board is divided into an outer surface layer and a core layer. The outer surface layer is the outer surface layer on both sides of the antibacterial diatom board, and the core layer is the intermediate layer between the two outer surface layers. The outer surface layer of the antibacterial diatom board is made of slurry A, and the slurry A contains ZnO-attapulgite. The core layer of the antibacterial diatom board is made of slurry B, and the slurry B contains Ag-ZnO nanowires; specifically, the intermediate layer between the two outer surface layers can be composed of multiple core layers; The formula of the slurry A mainly includes the following raw materials in parts by weight: 40-50 parts of diatomite, 15-30 parts of cement, 15-18 parts of resin, 10-15 parts of kaolin, 8-10 parts of quartz sand, 8-12 parts of ZnO-attapulgite material, 1-5 parts of dispersant, 0.1-1 part of thickener and 1-3 parts of defoamer; The formula of the slurry B mainly includes the following raw materials in parts by weight: 30-40 parts of diatomite, 16-20 parts of cement, 12-18 parts of resin, 8-12 parts of kaolin, 6-12 parts of quartz sand, 6-10 parts of Ag-ZnO nanowires, 1-3 parts of dispersant, 0.8-2 parts of thickener and 2-5 parts of defoamer; The Ag-ZnO nanowires are composite nanowires with a diameter of 50-400 nm, and the ZnO-attapulgite is a composite material prepared by solid-phase ion exchange.

2. The preparation process of the diatom board according to claim 1, comprising the following steps: Step 1, prepare Ag-ZnO nanowires: Add ammonia water and polyethylene glycol 4000 to the zinc nitrate solution in sequence to obtain a reaction solution; Then transfer the reaction solution to a reaction kettle and place it in an electrothermal blast drying oven for heating. After cooling at room temperature, separate, wash and dry the precipitate in the reaction kettle to obtain ZnO nanowires; Place the ZnO nanowires in a stannous chloride solution for activation, and after washing, disperse the ZnO nanowires in an ethanol / deionized water mixed solution to obtain a suspension. Add silver nitrate solution and polyvinylpyrrolidone (PVP-K45) / methanol solution to the suspension in sequence to obtain a precipitate, and obtain Ag-ZnO nanowires after washing and drying; Step 2, prepare ZnO-attapulgite material: Place attapulgite in a sintering furnace at 300 °C for activation. After cooling, uniformly mix zinc nitrate and attapulgite according to a certain mass ratio, and then place the mixed sample in a sintering furnace for calcination. After cooling, obtain ZnO-attapulgite material; Step 3, prepare the antibacterial diatom board: Step 3.1, Weigh a certain amount of diatomite, cement, kaolin, and quartz sand raw materials according to the ingredient list, and mix them evenly at room temperature with a stirrer. After mixing evenly, obtain mixed dry powder A and mixed dry powder B; Step 3.2, Stir the resin, dispersant, defoamer, thickener and water evenly, and then add them to the mixed dry powder prepared in Step 3.1 and mix and stir with Ag-ZnO nanowires and ZnO-attapulgite material respectively. After mixing evenly, flow through the outlet onto the release cloth, and form a slab after extrusion and dehydration, and perform layered demoulding, drying and static treatment to obtain slab A and slab B; Step 3.3: Place the blank A and blank B in the forming mold as required, add the corresponding coating, and perform high-temperature autoclaving treatment. After grinding and curing, a diatomite board with antibacterial function is obtained.

3. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The concentration of the zinc nitrate solution is 0.2 - 0.3 mol / L, the concentrations of the added ammonia water and polyethylene glycol 4000 are 0.4 - 0.6 mol / L and 0.08 - 0.12 mol / L respectively, the holding temperature in the electrothermal blast drying oven is 160 - 180 °C, and the holding time is 15 - 18 h.

4. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The concentration of the stannous chloride solution is 0.05 - 0.1 mol / L, the content of ZnO nanowires in the ZnO nanowire suspension is 15 - 20 g / L, the concentration of the added silver nitrate solution is 0.1 - 0.15 mol / L, and the content of PVP-K45 in the PVP-K45 / methanol solution is 40 - 50 g / L.

5. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The mixing ratio of the zinc nitrate to the attapulgite is 0.15 - 0.3:1, and the sintering furnace calcination process is: holding temperature 400 - 500 °C, holding time 2 - 4 h.

6. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The mixing speed of the mixed dry powder A and the mixed dry powder B is: 2000 - 2500 r / min, and the mixing time is 30 - 40 min.

7. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The mass of the water is 50% - 55% of the diatomite board raw materials.

8. The preparation process of the antibacterial diatom board according to claim 2, characterized in that, The high-temperature autoclaving process parameters are: temperature 150 - 180 °C, pressure value 1.2 - 1.4 MPa, and autoclaving curing time 12 - 15 h.

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