Composite board with lasting antibacterial and sterilizing functions and preparation method thereof

Abstract

The invention discloses a composite board with lasting antibacterial and sterilization functions and a preparation method thereof. The composite board comprises a base material and an antibacterial functional layer, wherein the antibacterial functional layer is formed by mixing a nano-silver compound (1-5%), a titanium dioxide photocatalyst (3-8%), a polyurethane / acrylic resin matrix (85-95%) and a silane coupling agent (0.5-2%) in percentage by weight. The substrate may be metallic or non-metallic. By optimizing the formula of the antibacterial functional layer, the problems that in the prior art, the adhesive force of a coating is poor, and antibacterial components are prone to loss are solved, the bonding strength of the antibacterial layer and the base material is remarkably improved, the broad-spectrum antibacterial performance is achieved, and the food safety requirement is met. The antibacterial rate of the composite board after 100 cleaning cycles is still kept to be greater than 95%, and the composite board shows excellent durability. The preparation method comprises the steps of raw material preparation, antibacterial functional layer preparation, base material surface treatment and composite processing, is high in process compatibility, is particularly suitable for surface protection of bathroom utensils, pet supplies and household products, and has remarkable market application value and popularization prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of new composite material manufacturing, and particularly relates to a composite board with a persistent antibacterial and sterilizing function and a preparation method thereof. Background Art

[0002] In the prior art, the preparation methods of antibacterial boards mainly include the following several kinds: Surface spraying antibacterial agent process: The antibacterial function is achieved by spraying an antibacterial agent on the surface of the board, but there are problems such as poor coating adhesion and easy loss of antibacterial components, resulting in difficulty in maintaining the antibacterial performance.

[0003] Antibacterial masterbatch mixing process: The antibacterial board is prepared by mixing an antibacterial masterbatch with a substrate, but this method may cause a decrease in the mechanical properties of the material, affecting the use performance of the board.

[0004] Combination process of the antibacterial layer and the substrate of the composite board: In the prior art, the bonding strength between the antibacterial layer and the substrate is insufficient, and it is difficult to meet the use requirements of high-frequency contact scenarios. Especially during cleaning or friction, the antibacterial layer is prone to peeling off.

[0005] The above problems limit the popularization of existing antibacterial boards in practical applications. Therefore, a new type of antibacterial composite board and its preparation method that can solve the above defects are needed. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a composite board with a persistent antibacterial and sterilizing function and a preparation method thereof, which can improve the bonding strength between the antibacterial layer and the substrate, achieve broad-spectrum antibacterial performance, and meet food safety requirements. The antibacterial rate of the composite board still remains >95% after 100 cleaning cycles, showing excellent durability. The preparation method includes raw material preparation, preparation of the antibacterial functional layer, surface treatment of the substrate, and composite processing. The process has strong compatibility and is particularly suitable for the surface protection of sanitary ware, pet supplies, and household products, having significant market application value and promotion prospects.

[0007] A composite board with a persistent antibacterial and sterilizing function according to an embodiment of the first aspect of the present invention, characterized by comprising: Comprising a substrate and an antibacterial functional layer, the antibacterial functional layer is composed of the following components mixed by weight percentage: 1-5% of nano silver composite, 3-8% of titanium dioxide photocatalyst, 85-95% of polyurethane / acrylic resin matrix, and 0.5-2% of silane coupling agent.

[0008] According to some embodiments of the present invention, the substrate is a metal substrate or a non-metal substrate, wherein the metal substrate includes stainless steel and aluminum alloy, and the non-metal substrate includes wood and density board.

[0009] A composite board with a persistent antibacterial and sterilization function according to an embodiment of the present invention has at least the following beneficial effects: By optimizing the formula of the antibacterial functional layer (reasonable ratio of nano-silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix, and silane coupling agent), the problems of poor adhesion of the existing antibacterial coating and easy loss of antibacterial components are solved, the bonding strength between the antibacterial layer and the substrate is significantly improved (peel strength ≥ 3.5 N / mm), broad-spectrum antibacterial performance is achieved (24-hour antibacterial rate against Escherichia coli and Staphylococcus aureus > 99.9%), and food safety requirements are met. In addition, the antibacterial rate of the composite board still remains > 95% after 100 cleaning cycles, showing excellent durability. At the same time, it has strong process compatibility and is applicable to various substrates such as metals (such as stainless steel, aluminum alloy) and non-metals (such as wood, density board), broadening the application range, and is particularly suitable for surface protection of sanitary ware, pet supplies, and household products.

[0010] A preparation method of a composite board with a persistent antibacterial and sterilization function according to a second aspect embodiment of the present invention: A. Raw material preparation; a. Base film; 1) Select PET (polyethylene terephthalate), PP (polypropylene), or PC (polycarbonate) film with a thickness of 0.05 - 0.5 mm; 2) The base film should have good mechanical properties and chemical stability to ensure the adhesion of the antibacterial coating.

[0011] b. Antibacterial coating materials; 1) Nano-silver composite: particle size 10 - 50 nm, purity ≥ 99.9%; 2) Titanium dioxide photocatalyst: particle size 20 - 50 nm, purity ≥ 99%; 3) Polyurethane / acrylic resin matrix: solid content ≥ 50%, moderate viscosity; 4) Silane coupling agent: such as KH550 or KH570, used to improve the bonding performance between the coating and the substrate.

[0012] c. Substrate; 1) Metal substrate: stainless steel, aluminum alloy, etc., the surface needs to be clean and free of oil; 2) Non-metal substrate: wood, density board, etc., the surface needs to be flat and crack-free.

[0013] B. Preparation of antibacterial functional layer; d. Base film treatment; 1) Cut the base film to the required size to ensure the surface is clean and dust-free; 2) If necessary, the base film can be pretreated (such as corona treatment) to improve the coating adhesion.

[0014] e. Coating preparation; 1) Mixing process: Mix the nano - silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix, and silane coupling agent evenly by weight percentage (nano - silver composite 1 - 5%, titanium dioxide 3 - 8%, resin matrix 85 - 95%, coupling agent 0.5 - 2%); 2) Stirring conditions: Stir at a speed of 500 - 1000 rpm for 30 - 60 minutes at room temperature to ensure that all components are fully dispersed.

[0015] f. Coating process; 1) Coating method: Adopt micro - gravure coating or slot - die coating method to evenly coat the antibacterial coating on the surface of the base film; 2) Coating thickness: Control it within the range of 0.01 - 0.1 mm to ensure the balance between antibacterial performance and coating adhesion; 3) Drying conditions: Dry at 60 - 80 °C for 10 - 30 minutes after coating to remove the solvent.

[0016] C. Substrate surface treatment; g. Metal substrate treatment; 1) Sandblasting treatment: Use abrasives with a particle size of 80 - 120 mesh to sandblast until the surface roughness reaches Sa2.5 level to enhance coating adhesion; 2) Passivation treatment: Treat the surface with a passivating agent (such as chromate solution) to improve corrosion resistance. The treatment time is 5 - 10 minutes, and then rinse with deionized water and dry.

[0017] h. Non - metal substrate treatment; 1) Plasma treatment: Adopt plasma treatment with a power of 100 - 500 W and a treatment time of 30 - 120 s to improve surface energy and adhesion; 2) Cleaning treatment: Before treatment, clean the surface of the substrate with a neutral cleaner to remove oil stains and dust.

[0018] D. Composite processing; i. Hot - press lamination; 1) Temperature control: 2) Metal substrate: Pre - heating zone 80 - 100 °C, lamination temperature 90 - 110 °C; 3) Non - metal substrate: Pre - heating zone 60 - 80 °C, lamination temperature 70 - 90 °C; 4) Pressure control: Lamination pressure 0.5 - 2 MPa, pressure - holding time 30 - 120 s; 5) Equipment requirements: Use a hot - press machine equipped with temperature sensors and pressure sensors to ensure precise control of process parameters.

[0019] j. Adhesive lamination; 1) Adhesive selection: Select a two-component polyurethane adhesive with a coating amount of 15 - 30 g / m²; 2) Coating method: Use roller coating or spraying method to ensure uniform distribution of the adhesive; 3) Curing conditions: Cure at room temperature for 24 hours or at 60 °C for 2 hours.

[0020] A preparation method of a composite board with a persistent antibacterial and sterilization function according to an embodiment of the present invention has at least the following beneficial effects: By selecting PET, PP or PC film as the base film and combining the optimized formula of nano-silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix and silane coupling agent, the prepared antibacterial functional layer not only has excellent antibacterial performance (the 24-hour antibacterial rate against Escherichia coli and Staphylococcus aureus > 99.9%), but also has a high bonding strength with the substrate (peel strength ≥ 3.5 N / mm), effectively solving the problems of easy coating peeling and easy loss of antibacterial components in the prior art. At the same time, through surface pretreatment processes such as sandblasting, passivation and plasma treatment, the bonding performance between metal and non-metal substrates and the antibacterial layer is significantly improved, ensuring the durability of the composite board in high-frequency contact and cleaning cycle scenarios (the antibacterial rate remains > 95% after 100 cleaning cycles). In addition, the preparation process of the present invention has strong compatibility and is applicable to a variety of substrates (such as stainless steel, aluminum alloy, wood, density board, etc.), broadening the application scope, and is particularly suitable for the surface protection of sanitary ware, pet supplies and household products, having significant market application value and promotion prospects.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Detailed Embodiments

[0022] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, understand greater than, less than, exceeding, etc. as not including the present number, and understand above, below, within, etc. as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0024] A composite board with a persistent antibacterial and sterilization function according to an embodiment of the first aspect of the present invention is characterized in that it includes: It includes a base material and an antibacterial functional layer, and the antibacterial functional layer is composed of the following components mixed by weight percentage: 1-5% of nano silver complex, 3-8% of titanium dioxide photocatalyst, 85-95% of polyurethane / acrylic resin matrix, and 0.5-2% of silane coupling agent. By adding nano silver complex and titanium dioxide photocatalyst in the antibacterial functional layer, the composite board of the present invention can effectively inhibit and kill various bacteria and fungi, including Escherichia coli and Staphylococcus aureus, and the antibacterial rate within 24 hours exceeds 99.9%. This characteristic makes the composite board particularly suitable for places with high hygiene requirements, such as hospitals, food processing places, public restrooms, etc. The use of polyurethane / acrylic resin matrix and silane coupling agent significantly improves the bonding strength between the antibacterial functional layer and the base material, and the peel strength reaches more than 3.5 N / mm. This high bonding strength ensures that the antibacterial layer will not fall off during long-term use and frequent cleaning, thus ensuring the durability of the antibacterial effect.

[0025] According to some embodiments of the present invention, the base material is a metal base material or a non-metal base material, wherein the metal base material includes stainless steel and aluminum alloy, and the non-metal base material includes wood and density board. The composite board of the present invention is applicable to a variety of base materials, including metals (such as stainless steel and aluminum alloy) and non-metals (such as wood and density board). This wide applicability enables the composite board to be applied to various different products and scenarios, such as sanitary ware, pet supplies, home decoration, etc. The hot pressing composite and adhesive composite processes adopted in the preparation method are highly compatible with the existing production processes, facilitating large-scale industrial production. At the same time, the precise control of process parameters ensures the consistency of product quality.

[0026] A composite board with a persistent antibacterial and sterilization function according to an embodiment of the present invention has at least the following beneficial effects: By optimizing the formula of the antibacterial functional layer (reasonable ratio of nano silver complex, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix and silane coupling agent), it solves the problems of poor adhesion of the existing antibacterial coating and easy loss of antibacterial components, significantly improves the bonding strength between the antibacterial layer and the base material (peel strength ≥ 3.5 N / mm), realizes broad-spectrum antibacterial performance (the antibacterial rate within 24 hours for Escherichia coli and Staphylococcus aureus > 99.9%), and meets food safety requirements. In addition, the antibacterial rate of the composite board still remains > 95% after 100 cleaning cycles, showing excellent durability. At the same time, it has strong process compatibility, is applicable to a variety of base materials such as metals (such as stainless steel, aluminum alloy) and non-metals (such as wood, density board), broadens the application scope, and is particularly suitable for surface protection of sanitary ware, pet supplies and household products.

[0027] A preparation method of a composite board with a persistent antibacterial and sterilization function according to an embodiment of the second aspect of the present invention: A. Raw material preparation; a. Base film; 1) Select PET (polyethylene terephthalate), PP (polypropylene) or PC (polycarbonate) film with a thickness of 0.05 - 0.5 mm; 2) The base film should have good mechanical properties and chemical stability to ensure the adhesion of the antibacterial coating.

[0028] b. Antibacterial coating material; 1) Nano - silver composite: particle size 10 - 50 nm, purity ≥ 99.9%; 2) Titanium dioxide photocatalyst: particle size 20 - 50 nm, purity ≥ 99%; 3) Polyurethane / acrylic resin matrix: solid content ≥ 50%, moderate viscosity; 4) Silane coupling agent: such as KH550 or KH570, used to improve the bonding performance between the coating and the substrate.

[0029] c. Substrate; 1) Metal substrate: stainless steel, aluminum alloy, etc., the surface needs to be clean and free of oil; 2) Non - metal substrate: wood, density board, etc., the surface needs to be flat and crack - free.

[0030] B. Preparation of antibacterial functional layer; d. Treatment of base film; 1) Cut the base film to the required size to ensure the surface is clean and dust - free; 2) If necessary, the base film can be pretreated (such as corona treatment) to improve the coating adhesion.

[0031] e. Preparation of coating; 1) Mixing process: Mix the nano - silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix and silane coupling agent according to the weight percentage (nano - silver composite 1 - 5%, titanium dioxide 3 - 8%, resin matrix 85 - 95%, coupling agent 0.5 - 2%) evenly; 2) Stirring conditions: Stir at a speed of 500 - 1000 rpm for 30 - 60 minutes at room temperature to ensure that each component is fully dispersed.

[0032] f. Coating process; 1) Coating method: Adopt micro - gravure coating or slot - die extrusion coating method to evenly coat the antibacterial coating on the surface of the base film; 2) Coating thickness: Control within the range of 0.01 - 0.1 mm to ensure the balance between antibacterial performance and coating adhesion; 3) Drying conditions: Dry at 60 - 80 °C for 10 - 30 minutes after coating to remove the solvent.

[0033] C. Surface treatment of substrate; g. Treatment of metal substrates; 1) Sandblasting treatment: Abrasives with a particle size of 80 - 120 mesh are used for sandblasting until the surface roughness reaches Sa2.5 level to enhance the coating adhesion. 2) Passivation treatment: The surface is treated with a passivating agent (such as chromate solution) to improve corrosion resistance. The treatment time is 5 - 10 minutes, and then it is rinsed with deionized water and dried.

[0034] h. Treatment of non - metal substrates; 1) Plasma treatment: Plasma treatment with a power of 100 - 500W and a treatment time of 30 - 120s is adopted to improve surface energy and adhesion. 2) Cleaning treatment: Before treatment, the surface of the substrate needs to be cleaned with a neutral cleaner to remove oil stains and dust.

[0035] D. Composite processing; i. Hot - press lamination; 1) Temperature control: 2) For metal substrates: The pre - heating zone is 80 - 100°C, and the lamination temperature is 90 - 110°C; 3) For non - metal substrates: The pre - heating zone is 60 - 80°C, and the lamination temperature is 70 - 90°C; 4) Pressure control: The lamination pressure is 0.5 - 2MPa, and the pressure - holding time is 30 - 120s; 5) Equipment requirements: Use a hot - press machine equipped with temperature sensors and pressure sensors to ensure precise control of process parameters.

[0036] j. Adhesive lamination; 1) Adhesive selection: Select a two - component polyurethane adhesive with a coating amount of 15 - 30 g / m²; 2) Coating method: Adopt roll coating or spraying methods to ensure uniform distribution of the adhesive; 3) Curing conditions: Cure at room temperature for 24 hours or at 60°C for 2 hours.

[0037] A preparation method of a composite board with a persistent antibacterial and sterilization function according to an embodiment of the present invention has at least the following beneficial effects: By selecting PET, PP or PC film as the base film and combining the optimized formula of nano-silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix and silane coupling agent, the prepared antibacterial functional layer not only has excellent antibacterial performance (the 24-hour antibacterial rate against Escherichia coli and Staphylococcus aureus > 99.9%), but also has a high bonding strength with the substrate (the peel strength ≥ 3.5 N / mm), effectively solving the problems of easy coating peeling and easy loss of antibacterial components in the prior art. At the same time, through surface pretreatment processes such as sandblasting, passivation and plasma treatment, the bonding performance between the metal and non-metal substrates and the antibacterial layer is significantly improved, ensuring the durability of the composite board in high-frequency contact and cleaning cycle scenarios (the antibacterial rate remains > 95% after 100 cleaning cycles). In addition, the preparation process of the present invention has strong compatibility and is applicable to a variety of substrates (such as stainless steel, aluminum alloy, wood, density board, etc.), broadening the application scope, and is particularly suitable for the surface protection of sanitary ware, pet products and household products, having significant market application value and promotion prospects.

[0038] The above embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can also be made without departing from the gist of the present invention.

Claims

1. A composite board with a persistent antibacterial and sterilizing function, characterized in that, Comprising: Comprising a substrate and an antibacterial functional layer, the antibacterial functional layer is composed of the following components mixed by weight percentage: 1-5% of nano silver composite, 3-8% of titanium dioxide photocatalyst, 85-95% of polyurethane / acrylic resin matrix, and 0.5-2% of silane coupling agent.

2. The composite board with a persistent antibacterial and sterilizing function according to claim 1, characterized in that: The substrate is a metal substrate or a non-metal substrate, where the metal substrate includes stainless steel and aluminum alloy, and the non-metal substrate includes wood and density board.

3. A preparation method of a composite board with a persistent antibacterial and sterilization function: A. Preparation of raw materials; a. Base film; 1) Select PET (polyethylene terephthalate), PP (polypropylene) or PC (polycarbonate) film with a thickness of 0.05-0.5 mm; 2) The base film should have good mechanical properties and chemical stability to ensure the adhesion of the antibacterial coating; b. Antibacterial coating material; 1) Nano silver composite: particle size 10-50 nm, purity ≥ 99.9%; 2) Titanium dioxide photocatalyst: particle size 20-50 nm, purity ≥ 99%; 3) Polyurethane / acrylic resin matrix: solid content ≥ 50%, moderate viscosity; 4) Silane coupling agent: such as KH550 or KH570, used to improve the bonding performance between the coating and the substrate; c. Substrate; 1) Metal substrate: stainless steel, aluminum alloy, etc., the surface needs to be clean and free of oil; 2) Non-metal substrate: wood, density board, etc., the surface needs to be flat and free of cracks; B. Preparation of the antibacterial functional layer; d. Treatment of the base film; 1) Cut the base film to the required size to ensure the surface is clean and dust-free; 2) If necessary, the base film can be pretreated (such as corona treatment) to improve the coating adhesion; e. Preparation of the coating; 1) Mixing process: Mix the nano silver composite, titanium dioxide photocatalyst, polyurethane / acrylic resin matrix and silane coupling agent evenly according to the weight percentage (1-5% of nano silver composite, 3-8% of titanium dioxide, 85-95% of resin matrix, 0.5-2% of coupling agent); 2) Stirring conditions: Stir at a speed of 500-1000 rpm for 30-60 minutes at room temperature to ensure that each component is fully dispersed; f. Coating process; 1) Coating method: Adopt microgravure coating or slot extrusion coating method to evenly coat the antibacterial coating on the surface of the base film; 2) Coating thickness: Control within the range of 0.01-0.1 mm to ensure the balance of antibacterial performance and coating adhesion; 3) Drying conditions: Dry at 60-80 °C for 10-30 minutes after coating to remove the solvent; C. Surface treatment of the substrate; g. Treatment of the metal substrate; 1) Sandblasting treatment: Use abrasive with a particle size of 80-120 mesh to sandblast until the surface roughness reaches Sa2.5 level to enhance the coating adhesion; 2) Passivation treatment: Treat the surface with a passivating agent (such as chromate solution) to improve the corrosion resistance; the treatment time is 5-10 minutes, and then rinse with deionized water and dry; h. Treatment of the non-metal substrate; 1) Plasma treatment: Adopt plasma treatment with a power of 100-500 W and a treatment time of 30-120 s to improve the surface energy and adhesion; 2) Cleaning treatment: Before treatment, the surface of the substrate needs to be cleaned with a neutral cleaner to remove oil stains and dust; D. Composite processing; i. Hot press lamination; 1) Temperature control: 2) Metal substrate: Preheating zone 80 - 100 °C, lamination temperature 90 - 110 °C; 3) Non - metal substrate: Preheating zone 60 - 80 °C, lamination temperature 70 - 90 °C; 4) Pressure control: Lamination pressure 0.5 - 2 MPa, pressure holding time 30 - 120 s; 5) Equipment requirements: Use a hot press equipped with a temperature sensor and a pressure sensor to ensure precise control of process parameters; j. Adhesive lamination; 1) Adhesive selection: Select a two - component polyurethane adhesive, coating amount 15 - 30 g / m²; 2) Coating method: Adopt roll coating or spraying method to ensure uniform distribution of the adhesive; 3) Curing conditions: Cure at room temperature for 24 hours or at 60 °C for 2 hours.