Antibacterial melt-blown composite non-woven fabric

Abstract

The antibacterial melt-blown composite non-woven fabric comprises a spun-bonded non-woven fabric layer, a first antibacterial melt-blown non-woven fabric layer, an electret melt-blown non-woven fabric, an electret electrostatic spinning nanofiber membrane and a spunlace non-woven fabric layer which are compounded with one another. According to the antibacterial melt-blown composite non-woven fabric, the antibacterial melt-blown non-woven fabric layer is used, so that the composite non-woven fabric has a good antibacterial effect. And the adsorption effect of the composite non-woven fabric can be improved by using the electret melt-blown non-woven fabric and the electret electrostatic spinning nanofiber membrane.

Description

Technical Field

[0001] The utility model relates to an antibacterial melt-blown composite non-woven fabric, belonging to the technical field of non-woven fabrics. Background Art

[0002] As people's living standards continue to improve, so do their expectations for their personal and working environments. Various non-woven fabrics are gradually becoming part of people's lives. Meltblown non-woven fabrics, a type of non-woven fabric, are produced using a one-step process characterized by high production speed and ease of operation. Thermoplastic resin pellets are melt-extruded, and the ejected fibers are drawn under the action of high-velocity hot air to form fibers. The fibers then adhere to the heat of the fibers and are laid onto a web to create the non-woven fabric. After electret treatment, meltblown non-woven fabrics are effective in adsorbing airborne particles such as dust and bacteria. Due to their small fiber diameter, large specific surface area, small pores, and high porosity, they are widely used in air filtration and healthcare applications, and have great application prospects and a promising market. However, existing meltblown non-woven fabrics have poor antibacterial properties, raising the question of how to improve the antibacterial efficacy of meltblown composite non-woven fabrics for medical and healthcare applications. Utility Model Content

[0003] The utility model aims to provide an antibacterial melt-blown composite non-woven fabric with good adsorption effect and antibacterial effect.

[0004] In order to solve the above technical problems, the purpose of this utility model is achieved as follows:

[0005] The utility model relates to an antibacterial melt-blown composite non-woven fabric, which comprises a composite spunbond non-woven fabric layer, a first antibacterial melt-blown non-woven fabric layer, an electret melt-blown non-woven fabric, an electret electrostatically spun nanofiber membrane and a spunlace non-woven fabric layer.

[0006] On the basis of the above solution and as a preferred solution of the above solution: the first antibacterial meltblown non-woven fabric layer is a nano-silver meltblown non-woven fabric.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the nano-silver meltblown non-woven fabric includes a meltblown non-woven fabric base layer, a polydopamine coating and a nano-silver particle layer.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: the electret electrospun nanofiber membrane is a PVDF / PTFE nanofiber membrane, a PAN electrospun nanofiber membrane or a PS / PAN / PS electrospun nanofiber membrane.

[0009] On the basis of the above solution and as a preferred solution of the above solution: the electret meltblown non-woven fabric is an electret microfiber PLA meltblown non-woven fabric.

[0010] On the basis of the above solution and as a preferred solution of the above solution: a second antibacterial meltblown non-woven fabric layer is provided between the electrospun nanofiber membrane and the spunlace non-woven fabric layer.

[0011] On the basis of the above solution and as a preferred solution of the above solution: the surface of the spunlace non-woven fabric layer on the side close to the electrospun nanofiber membrane is composited with a biodegradable water-absorbing non-woven fabric layer.

[0012] The beneficial effects of the present invention are as follows: the antibacterial meltblown composite nonwoven fabric of the present invention has a good antibacterial effect due to the antibacterial meltblown nonwoven fabric layer used, and the electret meltblown nonwoven fabric and electret electrospun nanofiber membrane used can enhance the adsorption effect of the composite nonwoven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 1 is a schematic structural diagram of the antibacterial meltblown composite nonwoven fabric involved in Example 1;

[0014] Figure 2 1 is a schematic structural diagram of the nano-silver meltblown non-woven fabric involved in Example 1;

[0015] Figure 3 It is a schematic structural diagram of the antibacterial meltblown composite nonwoven fabric involved in Example 2.

[0016] The markings in the figure are as follows: 1-spunbond non-woven fabric layer; 2-first antibacterial meltblown non-woven fabric layer; 3-electret meltblown non-woven fabric; 4-electret electrospun nanofiber membrane; 5-spunlace non-woven fabric layer; 6-second antibacterial meltblown non-woven fabric layer; 7-biodegradable water-absorbing non-woven fabric layer; 21-meltblown non-woven fabric base layer; 22-polydopamine coating; 23-nanosilver particle layer. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1

[0019] Combine Figure 1 and Figure 2 , this embodiment is described in detail. The antibacterial meltblown composite nonwoven fabric involved in this embodiment includes a spunbond nonwoven fabric layer 1 composited with hot melt adhesive powder, a first antibacterial meltblown nonwoven fabric layer 2, an electret meltblown nonwoven fabric 3, an electret electrospun nanofiber membrane 4, and a spunlace nonwoven fabric layer 5. The use of the first antibacterial meltblown nonwoven fabric layer 2 can enhance the antibacterial effect of the composite nonwoven fabric. The use of the electret meltblown nonwoven fabric and the electret electrospun nanofiber membrane can enhance the adsorption effect of the composite nonwoven fabric. The use of the spunlace nonwoven fabric layer 5 can enhance the softness and comfort of the mask made from the composite nonwoven fabric.

[0020] Furthermore, the first antibacterial meltblown nonwoven fabric layer 2 is a nanosilver meltblown nonwoven fabric. The nanosilver meltblown nonwoven fabric includes a meltblown nonwoven fabric base layer 21, a polydopamine coating 22, and a nanosilver particle layer 23. When in use, the meltblown nonwoven fabric base layer 21 is arranged on the side close to the electret meltblown nonwoven fabric 3. Dopamine can undergo self-oxidative polymerization under mild reaction conditions to form polydopamine, and polydopamine has extremely strong adhesion, which can improve the bonding strength between the meltblown nonwoven fabric base layer 21 and the nanosilver particle layer 23. After testing, the antibacterial effect of the nanosilver meltblown nonwoven fabric on Escherichia coli, Staphylococcus aureus, and Candida albicans reached more than 90%.

[0021] Furthermore, the electret electrostatically spun nanofiber membrane 4 is a PVDF / PTFE nanofiber membrane, a PAN electrostatically spun nanofiber membrane or a PS / PAN / PS electrostatically spun nanofiber membrane. In TFE, the C—F bond is covalently bonded, and there are no free electrons in the molecule, making the entire molecule neutral, with low dielectric loss and excellent electrical insulation performance. A large amount of charge can be stored inside the fiber and is not easily dissipated. At the same time, the polarity of the fluorine atom is strong, and the ability to adsorb electrons is extremely large, so it can effectively adsorb harmful particulate matter in the air. In PVDF, the C—F and C—H bonds have large dipole moments, a high dielectric constant, low dielectric loss (about 0.04 to 0.20), and good dielectric properties. The polyacrylonitrile (PAN) main chain is a C—C single bond structure, and each repeating unit contains a cyano (—CN) group, which has strong polarity, making it easy for molecules to form a strong dipole force. Therefore, it is easy to form a dipole charge, which improves the electrostatic adsorption performance of the filter material. PS is an excellent non-fluorinated electret material with a low dielectric constant and high resistivity, as well as excellent insulation and hydrophobicity, which inhibits the dissipation of charge within the fiber membrane. The PS / PAN / PS electrospun nanofiber membrane is composed of a PAN nanofiber membrane as the inner layer, with PS nanofiber membrane layers spun on the upper and lower surfaces. Specifically, in this example, a PVDF / PTFE nanofiber membrane was selected.

[0022] Furthermore, the electret meltblown nonwoven fabric 3 is an electret microfiber PLA meltblown nonwoven fabric. It is made from renewable and biodegradable PLA chips and nanoparticle additives through an improved meltblown microfiber processing process, followed by an electret finishing process. The renewable and biodegradable PLA chips are made from left-handed PLA chips, with a crystallinity between 30% and 60%, a melt index between 70 and 400, a molecular weight between 100,000 and 150,000, a melting point between 165°C and 180°C, and a glass transition temperature between 55°C and 75°C. The nanoparticle additives are inorganic nanoparticles: montmorillonite, clay, or calcium carbonate, with particle diameters between 20 and 300 nanometers. After the electret treatment, the fabric exhibits high filtration efficiency, with a particle capture efficiency exceeding 99.95%.

[0023] Example 2

[0024] Combine Figure 3 , this embodiment is described in detail. The antibacterial meltblown composite nonwoven fabric involved in this embodiment differs from that of the first embodiment in that a second antibacterial meltblown nonwoven fabric layer 6 is disposed between the electrospun nanofiber membrane 4 and the spunlace nonwoven fabric layer 5. This second antibacterial meltblown nonwoven fabric layer 6 is also made of nanosilver meltblown nonwoven fabric. Furthermore, the meltblown nonwoven fabric base layer 21 is disposed on the side adjacent to the electret electrospun nanofiber membrane 4.

[0025] Another difference from the previous embodiment is that the spunlace nonwoven fabric layer 5 is laminated with a biodegradable water-absorbent nonwoven fabric layer 7 on the side closest to the electrospun nanofiber membrane 4. The biodegradable water-absorbent nonwoven fabric layer 7 is composed of 30-50 wt% multifunctional superabsorbent seaweed fiber and 50-70 wt% polylactic acid fiber, and is thermally bonded to form a web.

[0026] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. An antibacterial meltblown composite nonwoven fabric, characterized in that: The invention comprises a composite spunbond nonwoven fabric layer (1), a first antibacterial meltblown nonwoven fabric layer (2), an electret meltblown nonwoven fabric (3), an electret electrostatically spun nanofiber membrane (4), and a spunlace nonwoven fabric layer (5).

2. The antibacterial meltblown composite nonwoven fabric according to claim 1, characterized in that: The first antibacterial meltblown non-woven fabric layer (2) is a nano-silver meltblown non-woven fabric.

3. The antibacterial meltblown composite nonwoven fabric according to claim 2, characterized in that: The nano-silver melt-blown non-woven fabric comprises a melt-blown non-woven fabric base layer (21), a polydopamine coating layer (22) and a nano-silver particle layer (23).

4. The antibacterial meltblown composite nonwoven fabric according to claim 1, characterized in that: The electret electrospun nanofiber membrane (4) is a PVDF / PTFE nanofiber membrane, a PAN electrospun nanofiber membrane or a PS / PAN / PS electrospun nanofiber membrane.

5. The antibacterial meltblown composite nonwoven fabric according to claim 1, characterized in that: The electret meltblown nonwoven fabric (3) is an electret ultrafine fiber PLA meltblown nonwoven fabric.

6. The antibacterial meltblown composite nonwoven fabric according to claim 1, characterized in that: A second antibacterial meltblown non-woven fabric layer (6) is provided between the electrospun nanofiber membrane (4) and the spunlace non-woven fabric layer (5).

7. The antibacterial melt-blown composite nonwoven fabric according to claim 6, characterized in that: The surface of the spunlace non-woven fabric layer (5) on one side close to the electrospun nanofiber membrane (4) is composited with a biodegradable water-absorbing non-woven fabric layer (7).

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