A new antibacterial material with a wire-braided appearance, an article thereof, and a preparation method thereof

Abstract

The application belongs to the technical field of medical packaging and decorative packaging, and particularly discloses a novel antibacterial material with a wire-weaving appearance, a product thereof and a preparation method of the antibacterial material. The antibacterial material comprises a woven mesh cloth with through mesh holes which is woven by resin filaments; the upper and lower surfaces and the periphery of the woven mesh cloth are covered with a metal plating layer; a flow-casting resin layer containing nano-silver particles is arranged below the woven mesh cloth, the flow-casting resin layer comprises an outer cover part and an inner embedding part which fills the mesh holes, and the filling depth of the inner embedding part does not exceed the height of the mesh holes; a transparent ink layer is arranged above the woven mesh cloth, and the surface of the transparent ink layer is incompletely covered with a UV coating layer; and a primer layer is arranged on the lower surface of the flow-casting resin layer. The antibacterial material has the advantages of long antibacterial life, low cost, safety and beauty, good water permeability and resistance to yellowing, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of medical packaging and decorative packaging technology, specifically to a novel antibacterial material with a woven metal wire appearance, its products, and its preparation method. Background Technology

[0002] Medical supplies such as masks, gloves, gauze, and medical devices often use antimicrobial packaging. Antimicrobial packaging combines antimicrobial agents with packaging materials such as PP and PE that come into contact with the product to inhibit the growth and reproduction of microorganisms. Traditional antimicrobial packaging materials are mainly single-layer sheet structures made by extruding PP, PE and other plastic masterbatches with antimicrobial agents, or structures composed of the co-extruded sheet and a plastic substrate layer.

[0003] Existing antimicrobial packaging suffers from the problem of short-lived antimicrobial effects due to the volatility and oxidation of antimicrobial agents, especially organic antimicrobial agents. Their volatilization rate accelerates upon exposure to light and heat, not only shortening the antimicrobial duration of the packaging material but also potentially decomposing to produce toxic substances that can harm the indoor environment and even human health. Inorganic antimicrobial agents are safer than organic ones, but current conventional antimicrobial packaging made with them also fails to solve the problems of volatility and oxidation.

[0004] Research revealed that Japan employs a method of encapsulating nano-silver antibacterial agents with special glass microspheres and then blending them with resin. This method utilizes microporous glass particles to delay the volatilization of the antibacterial agent. However, this approach involves complex and costly technical processes such as encapsulating glass microspheres with nano-sized metal particles and creating directional micropores. Summary of the Invention

[0005] To address the aforementioned problems, one objective of this invention is to provide a novel antibacterial material with a woven metal wire-like appearance. This material serves as a raw material for antibacterial packaging and features long antibacterial lifespan, low cost, safety, and aesthetic appeal.

[0006] To achieve the above objectives, the specific technical solution adopted by the present invention is as follows:

[0007] A novel antibacterial material with a metallic wire-woven appearance includes a woven mesh fabric made of resin filaments. The woven mesh fabric has several through-holes (the shape and size of the holes can be designed according to requirements, and can be either regular or irregular weaving). The upper and lower surfaces and all sides of the woven mesh fabric are coated with a metallic layer. Below the woven mesh fabric is a cast resin layer containing nano-silver particles. The cast resin layer includes several embedded portions filling the holes of the woven mesh fabric and an outer cover portion covering the woven mesh fabric located below the embedded portions. The filling depth of the embedded part does not exceed the height of the mesh (i.e., the top position of the embedded part does not exceed the plane of the metal plating layer on the upper surface of the woven mesh); a transparent ink layer is provided above the woven mesh, and the surface of the transparent ink layer is not completely covered by a UV coating (here, "not completely covered" means that the UV coating leaves pores or channels for the release of nano-silver, and the coverage area of ​​the transparent ink layer is smaller than the surface area of ​​the transparent ink layer); the lower surface of the cast resin layer is provided with a base coating that serves as a protective barrier and a resin that connects to the adhesive or hot melt adhesive used in subsequent processes.

[0008] The antibacterial material of this invention first consists of a woven mesh fabric with a porous structure. Then, a highly safe inorganic antibacterial agent, nano-silver, is mixed with resin masterbatch and extruded onto the woven mesh fabric, forming a cast resin layer that covers the lower surface of the woven mesh fabric and fills the pores. This combination of the mesh fabric's pores and the cast resin layer's coverage provides a release channel for the nano-silver while simultaneously hindering its release, thus delaying its volatilization. Simultaneously, it achieves air barrier properties, delaying the oxidation of the nano-silver. These two improvements effectively extend the antibacterial effect. Furthermore, to achieve a metallic wire-like woven appearance, a transparent ink layer is applied to the woven mesh fabric, followed by a UV coating. While the microporous structure of the ink does not significantly hinder the release of the nano-silver, the UV coating does, inevitably making it difficult for the nano-silver to precipitate and affecting the material's antibacterial level. Therefore, this invention sets the UV coating to not completely cover the transparent ink layer, leaving a surface release channel for the nano-silver. Therefore, the present invention effectively solves the problem of easy volatility and oxidation of antibacterial agents in existing antibacterial packaging. Furthermore, the antibacterial material of the present invention can be prepared through conventional extrusion casting, coating, and printing processes, which is simple and has low processing costs.

[0009] Besides its improved antibacterial properties, another major advantage of the antibacterial material of this invention is its decorative effect, mimicking the appearance of woven metal wire. This is achieved through a combination of a metal plating layer, a transparent ink layer, and a UV coating applied to the upper, lower, and surrounding surfaces of the woven mesh. The metal plating layer creates a multi-dimensional, three-dimensional imitation of metal wire; the transparent ink layer can accommodate different metallic colors; and the UV coating enhances wear and scratch resistance, thus mimicking the surface characteristics of metal. Therefore, the antibacterial material of this invention successfully presents the appearance of woven metal wire, achieving a realistic three-dimensional visual effect, while effectively reducing material costs and offering high cost-effectiveness.

[0010] In summary, the main structural design of this invention, which combines woven mesh, a metal plating layer, a transparent ink layer, and a UV coating, achieves a simulated metallic wire woven appearance while simultaneously delaying the volatilization and oxidation of the antibacterial agent—a double benefit. Furthermore, the structure of the antibacterial material in this invention provides excellent encapsulation and protection for the cast resin layer, preventing the product from yellowing and reduced transparency caused by the reaction of silver ions with bacterial cell enzymes during the sterilization process.

[0011] Preferably, the transparent ink layer is recessed downwards in the portion facing the mesh openings, forming several recessed units, and the UV coating covers the non-recessed areas of the transparent ink layer. The transparent ink layer completely covers the woven mesh, and its structure, consisting of non-recessed areas and recessed areas formed by several recessed units, provides an ideal processing substrate for the UV coating. By selecting a screen roller with a shallow groove depth, the UV coating material can be applied to the non-recessed areas of the transparent ink layer without entering the recessed units, thus forming antibacterial agent release channels above the recessed units, achieving the processing of a UV coating with an incomplete coverage structure. Similarly, by selecting a gravure screen roller with a groove depth corresponding to the required ink volume, a fully covered transparent ink layer with recessed units can be formed on the woven mesh. Therefore, this structural design of the transparent ink layer greatly reduces the processing difficulty and cost of the UV coating.

[0012] Preferably, the base coating is formed by coating and curing an aqueous solution of polyethyleneimine, ethylene-acrylic acid copolymer, or high-molecular-weight polyester. The base coating formed using an aqueous coating liquid is impermeable to the cast resin layer, reducing mutual interference.

[0013] Preferably, the resin filaments are one or more of PET filaments, BOPA filaments, PC filaments, and PS filaments, and the common diameter of the resin filaments is 1-100 μm; the thickness of the woven mesh is 20-180 μm. The use of these relatively stiff materials for the resin filaments aims to improve the hardness and mechanical strength of the antibacterial material.

[0014] Preferably, the metal coating is an aluminum coating with a thickness of 100-400 nm. Besides aluminum, other metals such as chromium and nickel can also be used for the metal coating; the advantage of aluminum coating is its low price.

[0015] Preferably, the material of the cast resin layer is PE, EVA, PP, or MPE, and the thickness of the cast resin layer is 10-60 μm (here, the thickness of the cast resin layer includes the outer cover and the inner part). Choosing these low-temperature resins for the cast resin material can, on the one hand, avoid deformation of the woven mesh, and on the other hand, reduce raw material and processing costs.

[0016] Preferably, the thickness of the transparent ink layer is ≥1μm.

[0017] Preferably, the filling depth of the inlay does not exceed 70% of the mesh height, leaving at least 30% space to expose the metal plating, further enhancing the three-dimensionality of the simulated metal weave appearance. The filling depth of the inlay is adjusted and controlled by changing the slit width of the extruder casting die.

[0018] Preferably, the mass percentage of the nano-silver particles in the cast resin is 0.15-0.5%, so as to simultaneously achieve good antibacterial effect and cost control.

[0019] Preferably, the method for preparing the antibacterial material includes the following steps:

[0020] S1. The resin filaments are woven into a mesh and then rolled up.

[0021] S2. Vacuum plating is performed on the upper and lower surfaces and the surrounding area of ​​the woven mesh to form a metal coating;

[0022] S3. After vacuum plating, a transparent ink layer is gravure printed on the upper surface of the woven mesh.

[0023] S4. Roll-coat a UV coating onto the upper surface of the transparent ink layer;

[0024] S5. Mix the nano-silver particles with resin, and use an extrusion composite machine to extrude the cast resin layer to cover and fill the mesh holes on the lower surface of the woven mesh.

[0025] S6. Apply a primer coating to the underside of the cast resin layer, with a dry weight of 0.02-0.07 g / m². 2 (The coating amount must be strictly controlled to form a very thin base coat. The thinner the base coat, the tighter the bond with the cast resin layer. The dry weight of the coating should exceed 0.07 g / m².) 2 (Reduced peel strength), with a solid content of 0.7%-5.0%.

[0026] A second objective of this invention is to provide novel antibacterial products with a woven metal-like appearance made from the aforementioned antibacterial materials. Depending on the choice of processes following the base coating, this invention produces different types of antibacterial products within the same series: for example, gravure roller coating of pressure-sensitive adhesive produces pressure-sensitive adhesive-type antibacterial tape; gravure roller coating of solvent-based hot melt adhesive produces hot melt adhesive-type antibacterial tape; gravure roller coating of an tackifying base coating followed by in-mold injection molding (IMD) produces antibacterial medical device cases and other components; extrusion lamination of low-melting-point resin produces pre-coated antibacterial tape; and dry lamination or solvent-free lamination of polymer films produces dry-laminated or solvent-free composite antibacterial materials. This allows for the development of a variety of antibacterial products, including antibacterial packaging, with a very wide range of applications.

[0027] The present invention has the following beneficial effects:

[0028] 1. The antibacterial material of this invention effectively delays the volatilization of antibacterial agents by combining the design of the pores of the woven mesh with the controlled amount of nano-silver in the cast resin layer embedded in the woven mesh. At the same time, the encapsulation structure design of the resin layer containing nano-silver also effectively delays its oxidation, thus improving the antibacterial lifespan of the material from two aspects. The antibacterial material and its products have strong antibacterial ability and have a significant killing effect on Escherichia coli and Staphylococcus aureus.

[0029] 2. The antibacterial material of this invention has a woven metal wire appearance, with a three-dimensional and realistic visual effect. The imitation metal wire can be brass wire, copper wire, silver stainless steel wire, tungsten steel wire, etc., with a variety of colors and good aesthetics; compared with woven metal wire materials, the cost is significantly reduced.

[0030] 3. The antibacterial material of this invention possesses the additional function of antistatic properties due to its metal coating and special structural design, with a surface resistivity <1×10⁻⁶. 6 With a strength of Ω·cm, it has a significant advantage in antistatic properties when used as a clothing fabric.

[0031] 4. The antibacterial material of this invention has good safety, scratch resistance, mechanical strength, water permeability and yellowing resistance, and excellent comprehensive performance.

[0032] 5. The antibacterial material of the present invention can be prepared through conventional extrusion casting, coating and printing processes. The process is simple, the processing cost is low, and it has good economic benefits.

[0033] 6. The antibacterial material of this invention is mainly used in the medical industry. Specifically, it can be used as packaging or decorative material in medical testing instruments, hospital floors, medical vehicles, medical office supplies, medical clothing and masks, etc. It can also be used in automotive interiors, home appliances, stationery, clothing, furniture decoration and luxury packaging, building materials, food-related products and other fields, with broad application prospects. Attached Figure Description

[0034] Figure 1 Example 1: A schematic diagram of the structure of the novel antibacterial material with a woven appearance resembling metal wire.

[0035] Figure 2 Example 1: The appearance of the woven mesh after vacuum silver plating in the novel antibacterial material with a simulated metal wire woven appearance.

[0036] Figure 3 Example 1: Surface appearance diagram of the novel antibacterial material with a simulated metal wire braided appearance.

[0037] Figure 4 Example 2: A schematic diagram of the structure of the novel antibacterial product with a woven appearance resembling metal wire.

[0038] In the figure: 1-UV coating, 2-transparent ink layer, 3-woven mesh, 4-cast resin layer, 5-base coating; 6-first additional layer, 7-second additional layer; 31-mesh, 32-metal plating, 41-inset, 42-outer cover. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] A novel antibacterial material with an appearance resembling stainless steel wire weave is described. Specifically, it is a thin film with an appearance resembling silver stainless steel wire weave, without any post-coating or lamination processes, and is considered a semi-finished antibacterial product. Its structure is as follows... Figure 1 As shown, the structure includes a UV coating 1, a transparent ink layer 2, a woven mesh fabric 3 with a metal plating layer 32, a cast resin layer 4, and a base coating 5. More specifically, the woven mesh fabric 3 is woven from PET yarn and has several through-holes 31. The upper and lower surfaces and the perimeter of the woven mesh fabric 3 are covered with a metal plating layer 32, which is an aluminum plating layer. Below the woven mesh fabric 3, there is a cast resin layer 4 containing 0.3 wt% nano-silver particles. The material of the cast resin layer 4 is PE. The cast resin layer 4 includes several embedded portions 41 that fill the through-holes 31 of the woven mesh fabric 3, and an outer cover portion 42 located below the embedded portions 41 that covers the woven mesh fabric 3. The filling depth of the embedded portions 41 is half the height of the through-holes 31. A transparent ink layer 2 is provided above the woven mesh 3; the surface of the transparent ink layer 2 is not completely covered by a UV coating 1; the portion of the transparent ink layer 2 facing the mesh 31 is recessed downwards, forming several recessed units 21, and the UV coating 1 covers the non-recessed areas of the transparent ink layer 2. A base coating 5 is provided on the lower surface of the cast resin layer 4, and the base coating 5 is formed by coating and curing a polyethyleneimine aqueous solution.

[0042] The product dimensions are as follows: PET filament diameter is 45μm, woven mesh fabric 3 thickness is 90μm, metal plating layer 32 thickness is 300nm; cast resin layer 4 thickness is 55μm, transparent ink layer 2 thickness is 4μm, and base coating 5 dry weight is 0.07g / m². 2 The thickness is 0.02μm, and the solid content is 3%. The appearance of the woven mesh fabric 3 after vacuum aluminizing is as follows: Figure 2 As shown; the product (i.e., the antibacterial material) appears as follows. Figure 3 As shown, it has a silver stainless steel wire woven appearance, with a three-dimensional and realistic visual effect.

[0043] The method for preparing the antibacterial material is as follows:

[0044] S1. Making PET filament woven mesh: Set the diameter of PET filaments and the weaving pattern, and use the principle of electrostatic adsorption and a weaving hot press to complete the production of woven mesh 3 and roll it up;

[0045] S2. Vacuum coating: Vacuum coating is performed on the woven wire mesh 3 by a reversing frame, which basically achieves the coverage of the entire surface of the woven wires with an aluminum coating, and completes the preparation of the metal coating 32;

[0046] S3. Gravure Printing Transparent Ink: Using a gravure printing machine and a 100-mesh gravure plate, transparent colorless ink is printed on the surface of the woven screen fabric 3 to form a transparent ink layer 2 that imitates the woven effect of silver stainless steel wire.

[0047] S4. UV curing treatment: A 100-mesh gravure printing plate is used to coat the transparent ink layer 2 with transparent UV-type polyurethane resin using a gravure printing machine, and then exposed to ultraviolet light for curing to form an incompletely covered UV coating 1.

[0048] S5. Fabrication of the cast resin layer 4:

[0049] 1) Raw material testing: After testing with a laser scattering instrument, it was determined that the diameter of the silver particles met the design requirements, and the moisture content was ≤0.2% as a qualified indicator, as determined by a Karl Fischer moisture dropper.

[0050] 2) Raw material mixing: The nano-silver particles are immersed in methyl ethyl ketone solution for surface modification to reduce the difficulty of dispersion. After being taken out and dried, they are mixed with resin masterbatch and stirred until homogeneous.

[0051] 3) Single-sided extrusion antibacterial resin: Using a single-sided extrusion composite machine, PE is cast onto the lower surface of the PET woven mesh fabric. The single-sided extrusion cast PE resin contains a mixed type of PE resin with silver ion antibacterial agent. By adjusting the slit width of the die head, the gaps of the woven mesh fabric 3 are filled to form a water-impermeable cast resin layer 4.

[0052] S6. Applying the base coating resin: Using a 120-mesh gravure printing plate, apply a polyethyleneimine aqueous solution to the lower surface of the cast resin layer 4, and dry it to form the base coating layer 5.

[0053] Example 2

[0054] A novel antibacterial product with a woven appearance resembling metal wire, specifically a pressure-sensitive adhesive antibacterial tape with a brass wire woven appearance. Its structure is as follows: Figure 4 As shown, based on Example 1, a first additional layer 6 and a second additional layer 7 are added. The first additional layer 6 is a PSA adhesive layer disposed on the lower surface of the base coating layer 5, and the second additional layer 7 is a release film disposed on the lower surface of the first additional layer 6.

[0055] The specific preparation method is as follows:

[0056] S1-S6: Basically the same as in Example 1, except that the ink used in step S3 is a golden yellow transparent ink, forming a transparent ink layer 2 with a brass-like effect;

[0057] S7. Coating pressure-sensitive adhesive: Coating the lower surface of the antibacterial material obtained in step 6 with pressure-sensitive adhesive to form a PSA adhesive layer. After simultaneously drying the solvent and bonding the release film, the antibacterial tape with a brass wire braided appearance is obtained.

[0058] Product Features: Pressure-sensitive antibacterial tape can be applied to indoor items and boards at room temperature, providing a realistic brass wire appearance and antibacterial function, at a much lower cost than boards actually woven from brass wire.

[0059] Example 3

[0060] A novel antibacterial product with a woven appearance resembling metal wire is specifically a hot melt adhesive coated antibacterial tape with a woven appearance resembling copper wire. Its structure is basically the same as in Example 2, except that in this example, the first additional layer 6 is a coated hot melt adhesive layer, and it does not contain a second additional layer 7.

[0061] The specific preparation method is as follows:

[0062] S1-S6: Basically the same as in Example 1, except that the ink used in step S3 is a transparent copper-colored ink to form a transparent ink layer 2 with a copper-like effect;

[0063] S7. Coating with hot melt adhesive: Coating the lower surface of the antibacterial material obtained in step 6 with hot melt adhesive to form a hot melt adhesive layer. After simultaneously drying the solvent and winding, a hot melt adhesive type antibacterial tape with an imitation copper wire braided appearance is obtained.

[0064] Product Features: Hot melt adhesive antibacterial tape is hot-pressed onto other boards at high temperatures, replacing copper wire woven mesh or boards for mechanical processing of metal surfaces. It also has antibacterial function and is much cheaper than real copper wire woven metal boards.

[0065] Example 4

[0066] A novel antibacterial product with a simulated metal wire woven appearance is specifically an antibacterial medical device case with a simulated silver stainless steel wire woven fabric appearance, formed using in-mold injection molding (IMD). Its material structure is basically the same as in Example 2, except that in this example, the first additional layer 6 is an ABS resin layer, and it does not contain a second additional layer 7.

[0067] The specific preparation method is as follows:

[0068] S1-S6: Same as in Example 1;

[0069] S7. In-mold injection molding: After the antibacterial material obtained in step 6 is die-cut and molded, it is placed into the molding mold of IMD. The lower surface is then in-mold injected with ABS resin and removed to obtain a medical device case with the appearance of silver stainless steel wire woven cloth. Generally, the case body and the case lid are made into separate parts by multiple IMD processes.

[0070] Product Features: The medical device case, made of stainless steel wire woven material through the IMD process, has ideal mechanical strength, antibacterial function, and excellent decorative effect.

[0071] Example 5

[0072] A novel antibacterial product with a woven appearance resembling metal wire is specifically a pre-coated antibacterial tape with a woven appearance resembling nickel alloy steel wire. Its structure is basically the same as in Example 2, except that in this example, the first additional layer 6 is a high-temperature extruded EVA resin layer, and it does not contain a second additional layer 7.

[0073] The specific preparation method is as follows:

[0074] S1-S6: Basically the same as in Example 1, except that the ink used in step S3 is a light gray transparent ink, forming a transparent ink layer 2 that resembles the appearance of a nickel alloy wire;

[0075] S7. Pre-coated hot melt adhesive resin process for extrusion lamination: EVA hot melt adhesive granules with melt index MI = 15 g / 10 min (190℃, 2.16 kg) and melting point 85℃ are dried and fed into an extruder. They are extruded and cast onto the base coating layer 5 at a melting temperature of 215-230℃, with an extrusion thickness of 25 μm. Through the action of cooling rollers and extrusion rollers, they are combined with the molten EVA extruded from the die and wound up to obtain a pre-coated antibacterial tape with the appearance of nickel alloy steel wire braided cloth and a peel force value greater than 0.7 N / 15 mm.

[0076] Product Features: Extruded hot melt adhesive layers bond firmly to the substrate after high-temperature lamination, making them suitable for use on materials with uneven surfaces, gaps, or micropores, such as steel plates, composite boards, and templates. In contrast, coated hot melt adhesive layers are primarily suitable for use with smooth-surfaced films, resins, paper, and other lightweight packaging products.

[0077] Example 6

[0078] A novel antibacterial product with a woven appearance resembling metal wire is specifically a dry-laminated antibacterial composite material with a woven appearance resembling sky-blue stainless steel wire. Its structure is basically the same as in Example 2, except that in this example, the first additional layer 6 is a dry-laminated adhesive layer, and the second additional layer 7 is an MPE substrate film.

[0079] The specific preparation method is as follows:

[0080] S1-S6: Basically the same as in Example 1, except that the ink used in step S3 is sky blue transparent ink, forming a transparent ink layer 2 with a sky blue stainless steel appearance;

[0081] S7. Apply dry adhesive:

[0082] Using a dry laminating machine, a dry laminating adhesive is coated onto the lower surface of the antibacterial material obtained in step 6. After simultaneous drying of the solvent and winding, a transparent, sky-blue, multi-layer composite material with an imitation stainless steel wire woven appearance is obtained. The dry laminating adhesive uses Henkel isocyanate-based two-component adhesive UK2788 / 5015, with a main agent / curing agent / ethyl acetate ratio of 7:1:13.5, an adhesive working viscosity of 25±2S, and ethyl acetate as the diluent, with a solvent residue index ≤5mg / m³. 2 ;

[0083] The dry lamination process conditions are as follows: the first unwinding shaft is a braided yarn roll, the second unwinding shaft is an 80μm thick MPE, the winding taper is 50±5%, the lamination speed is 20±5m / min, the temperature of the three-stage drying oven is 65 / 75 / 65±5℃, the curing conditions are: curing chamber 50±5℃ ≥48h, and the temperature of the lamination roller is 70-90℃.

[0084] Product features: The resulting dry composite antibacterial composite material has antibacterial function and an appearance similar to sky blue stainless steel wire woven fabric, and can be used as packaging material; if pressure-sensitive adhesive is coated on it, it can become a composite functional tape product.

[0085] Example 7

[0086] A novel antibacterial product with a woven appearance resembling metal wire is specifically a solvent-free composite antibacterial material with a woven appearance resembling sky-blue stainless steel wire. Its structure is basically the same as in Example 6, except that in this example, the first additional layer 6 is a solvent-free adhesive layer.

[0087] The specific preparation method is as follows:

[0088] S1-S6: Same as Example 6; S7. Apply two-component polyurethane solvent-free composite adhesive:

[0089] Using a solventless laminating machine, the antibacterial material roll film obtained in step 6 is placed on the first unwinding shaft, and a solventless composite adhesive is coated on its lower surface. After passing through the conveyor rollers, it is laminated and wound at room temperature with the substrate from the second unwinding shaft at the composite roller, resulting in a transparent, sky-blue, multi-layer composite material with an imitation stainless steel wire woven appearance. The solventless composite adhesive is a two-component Boswellian polyurethane adhesive, the diluent is ethyl acetate, and the solvent residue index is ≤1 mg / m³. 2 Curing conditions: Natural curing at room temperature or curing chamber at 30±5℃ for ≥24h; composite roller temperature: 30-40℃.

[0090] Product features: The solvent-free composite antibacterial material has antibacterial function and a sky-blue stainless steel wire woven fabric appearance, and can be used as packaging material; if pressure-sensitive adhesive is coated on it, it can become a composite functional tape product.

[0091] Performance testing:

[0092] I. Antibacterial effect

[0093] Under the same testing conditions, the antibacterial material or its products of the present invention can maintain an antibacterial effect for up to six months, while the antibacterial effect of traditional structures (single-layer PE sheet extruded by co-extrusion of antibacterial agent and plastic masterbatch or composite structure with substrate) can only be maintained for a maximum of three months. It can be seen that the present invention has a significant effect on delaying the volatilization and oxidation of antibacterial agents.

[0094] Adding 0.2% metallic silver antibacterial microparticles to PE as an extrusion casting mixed PE resin resulted in an E. coli count of 10 on the metal-woven fabric (blank sample) before extrusion casting. 5 The Staphylococcus aureus count level is 10. 4 After 24 hours of single-sided extrusion casting, the bacterial counts of Escherichia coli and Staphylococcus aureus on the metal-like woven fabric decreased to 10.2 Therefore, the antibacterial material of this invention has strong antibacterial ability.

[0095] II. Permeability

[0096] Testing showed that the water vapor transmission rate of the products in Examples 1-7 was ≤12 g / m³. 2 24h), oxygen permeability ≤1400cm 3 / (m 2 With good weather resistance and excellent barrier effect, the nano-silver in the cast resin layer 4 is not easily affected by environmental interference, thus maintaining its antibacterial effect.

[0097] Comparative Example 1

[0098] An antibacterial material with a structure basically the same as in Example 1, except that the surface of the cast resin layer 4 in this comparative example is flat and there is no embedded part 41. The cast resin layer 4 and the woven mesh 3 are bonded together by hot pressing. This antibacterial material has the following defects: the nano-silver particles are easily displaced during material friction and are consumed prematurely, the antibacterial effect decays quickly, the antibacterial material will turn yellow in a short period of time, and compared with Example 1, the antibacterial time will be shortened by about 1 / 3 under the same test conditions.

[0099] Comparative Example 2

[0100] An antibacterial material with a structure basically the same as in Example 1, except that the UV coating 1 is not provided in this comparative example. This antibacterial material has the following defects: the surface braided filaments are not hard enough (≤0.1H), are not scratch-resistant, and are prone to fuzzing, thus greatly limiting its application range.

[0101] Comparative Example 3

[0102] An antibacterial material with a structure basically the same as in Example 1, except that the base coating layer 5 is not provided in this comparative example. This antibacterial material has the following defects: there are pores at the junction of the cast resin layer 4 and the subsequent coating or lamination process, resulting in unstable peel strength at various joints and blistering of the intermediate layer of the product.

[0103] Comparative Example 4

[0104] An antibacterial material with a structure basically the same as in Example 1, the difference being that: in this comparative example, double-sided printing of metallic ink is used to form a metallic appearance effect on the woven mesh. As a result, the visual effect of the imitation metal wire woven appearance is not three-dimensional and has reflective spots, which become the appearance effect of metal being corroded and rusted.

[0105] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. Any changes made by those skilled in the art after reading the specification of the present invention, as long as they are within the scope of the claims of the present invention, will be protected by patent law.

Claims

1. An antibacterial material with an appearance resembling woven metal wire, characterized in that: The woven mesh (3) is made of resin filaments and has a plurality of through-holes (31). The upper and lower surfaces and the periphery of the woven mesh (3) are covered with a metal plating layer (32). A cast resin layer (4) containing nano-silver particles is provided below the woven mesh (3). The cast resin layer (4) includes a plurality of embedded portions (41) that fill the mesh (31) of the woven mesh (3) and an outer cover portion that covers the woven mesh (3) below the embedded portions (41). (42) The filling depth of the embedded part (41) does not exceed 70% of the height of the mesh (31); a transparent ink layer (2) is provided above the woven mesh (3), the surface of the transparent ink layer (2) is not completely covered by a UV coating (1), the part of the transparent ink layer (2) facing the mesh (31) is recessed downward to form a number of recessed units (21), and the UV coating (1) covers the non-recessed area of ​​the transparent ink layer (2); a base coating (5) is provided on the lower surface of the cast resin layer (4).

2. The antibacterial material with a simulated metal wire braided appearance according to claim 1, characterized in that: The base coating (5) is formed by coating and curing polyethyleneimine, ethylene-acrylic acid copolymer or high molecular weight polyester aqueous solution.

3. The antibacterial material with a simulated metal wire braided appearance according to claim 1, characterized in that: The resin filaments are one or more of PET filaments, BOPA filaments, PC filaments, and PS filaments, and the thickness of the woven mesh (3) is 20-180μm.

4. The antibacterial material with a simulated metal wire braided appearance according to claim 1, characterized in that: The metal coating (32) is an aluminum coating with a thickness of 100-400 nm.

5. The antibacterial material with a simulated metal wire braided appearance according to claim 1, characterized in that: The material of the cast resin layer (4) is PE, EVA, PP or MPE, and the thickness of the cast resin layer (4) is 10-60μm; the mass ratio of the nano silver particles in the cast resin layer is 0.15-0.5%.

6. The antibacterial material with a simulated metal wire braided appearance according to claim 1, characterized in that: The thickness of the transparent ink layer (2) is ≥1μm.

7. The antibacterial material with a simulated metal wire braided appearance according to any one of claims 1-6, characterized in that: Its preparation method includes the following steps: S1. Use resin filaments to weave a woven mesh (3) and then roll it up; S2. Vacuum plating is performed on the upper and lower surfaces and the surrounding area of ​​the woven mesh (3) to form a metal plating layer (32). S3. After vacuum plating is completed, a transparent ink layer (2) is printed on the upper surface of the woven mesh (3). S4. Roll-coat a UV coating (1) onto the upper surface of the transparent ink layer (2); S5. Mix the nano-silver particles with resin, and use an extrusion composite machine to extrude the cast resin layer (4) to cover and fill the mesh (31) on the lower surface of the woven mesh (3). S6. Apply a primer coating (5) to the lower surface of the cast resin layer (4), with a dry weight of 0.02-0.07 g / m. 2 The solid content is 0.7-5.0%.

8. An antibacterial article with a woven metal-like appearance, including the antibacterial material with a woven metal-like appearance as described in any one of claims 1-6.

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