High-toughness antibacterial glue-free cotton

Abstract

The application discloses a high-toughness antibacterial glue-free cotton, which adopts a three-layer composite structure design: the surface layer is an antibacterial functional layer which is composed of cross-section graphene modified polyester fibers, the fibers are uniformly dispersed with graphene nanosheets, the surface forms nanoslot, and the fibers are connected through hot melting points; the middle layer is an elastic buffer layer which adopts spiral hollow polyester fibers to construct a three-dimensional network structure, the fiber surface is provided with micrometer grooves, and the porosity is 60-70%; and the bottom layer is a reinforcing layer which is composed of electrostatic spinning PBO fiber mesh and presents a hexagonal honeycomb arrangement. The layers are hot-pressed and compounded through low-melting-point COP fibers to form a gradient density distribution. The structure has excellent antibacterial property, high mechanical strength and good elasticity, and avoids the use of traditional glue.

Description

Technical Field

[0001] This utility model relates to the field of non-adhesive cotton technology, specifically to a high-toughness antibacterial non-adhesive cotton. Background Technology

[0002] Traditional non-woven cotton is mostly made of polyester / polypropylene fibers through thermal bonding of low-melting-point fibers, which has three major technical bottlenecks: First, the antibacterial performance depends on the finishing process (such as silver ion spraying), and the antibacterial rate decreases to below 70% after 5 washes; Second, to enhance toughness, more than 15% aramid fiber needs to be added, which leads to increased costs and a hardened feel (Shore hardness > 85HD); Third, the existing "multi-layer composite non-woven cotton" still has the problem of insufficient interlayer peel strength (<3N / cm).

[0003] The market urgently needs a non-adhesive cotton structure that combines long-lasting antibacterial properties, high peel strength, and controllable cost. Utility Model Content

[0004] In view of the problems and shortcomings of the existing technology, this utility model provides a high-toughness antibacterial non-adhesive cotton.

[0005] The technical solution of this utility model is as follows:

[0006] A high-toughness antibacterial non-adhesive cotton, comprising a three-layer structure laminated sequentially from the surface layer to the bottom layer:

[0007] Antibacterial functional layer: Composed of graphene-modified polyester fibers. The cross-section of the graphene-modified polyester fibers is cross-shaped, and the fineness of a single filament is 0.8-1.2 dtex. Graphene is uniformly dispersed in the form of nanosheets inside the fibers, and the fibers are connected by heat-fused knots with a knot density of 15-25 knots / mm. 2 ;

[0008] Elastic buffer layer: a three-dimensional network structure formed by interwoven helical hollow polyester fibers, with a helical pitch of 3-5 times the fiber diameter. The fiber surface is provided with micron-level grooves to increase entanglement points. The porosity of this layer is 60-70%.

[0009] Reinforcing layer: It is a PBO fiber web formed by electrospinning, with a fiber diameter of 0.5-2μm and a hexagonal honeycomb mesh with a pore size of 80-200μm;

[0010] The three-layer structure is achieved through hot-pressing composite of low-melting-point COP fibers.

[0011] Preferably, the fiber surface of the antibacterial functional layer has a nanogroove structure with a depth of 0.1-0.5 μm.

[0012] Furthermore, the graphene content in the antibacterial functional layer is 0.5-1.2 wt%.

[0013] The hollow polyester fibers in the elastic buffer layer have a hollow fiber content of 25%-40%. The PBO fiber web accounts for 5%-12% of the total weight. The distribution density of low-melting-point COP fibers is 3-8 fibers / mm. 2 .

[0014] A high-toughness antibacterial non-adhesive cotton also includes a transition layer disposed between the surface layer and the middle layer. The transition layer comprises a blend of graphene-modified polyester and spiral hollow polyester fibers in a blending ratio of 1:1 to 1:3.

[0015] A high-toughness, antibacterial, non-adhesive cotton with a total thickness of 2-10 mm and a density of 0.2-0.4 g / cm³. 3 .

[0016] The beneficial effects of this utility model are:

[0017] 1) Durable antibacterial properties: In-situ graphene polymerization + quaternary ammonium salt slow-release technology ensures that the antibacterial rate remains at 98.5% after 50 washes;

[0018] 2) Breakthrough in mechanical properties: The synergistic effect of PBO fiber web and spiral hollow polyester results in high tensile strength;

[0019] 3) Cost optimization: The tear resistance requirement can be achieved when only 8% of the electrospun PBO mesh is used;

[0020] 4) Environmental friendliness: COP bonding fiber has a melting point of only 110℃, which is more energy-efficient than traditional PET bonding. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Example 1;

[0022] Figure 2 This is a schematic diagram of the structure of Example 2;

[0023] The components represented by the reference numerals in the diagram are:

[0024] 1. Antibacterial functional layer; 2. Transition layer; 3. Elastic buffer layer; 4. Reinforcing layer. Detailed Implementation

[0025] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0026] Example 1

[0027] See Figure 1 This embodiment provides a high-toughness antibacterial non-adhesive cotton with an overall thickness of 6mm and a density of 0.3g / cm³. 3The structure consists of an antibacterial functional layer 1, a transition layer 2, an elastic buffer layer 3, and a reinforcing layer 4, arranged sequentially from the surface to the bottom. Stable interlayer bonding is formed between the layers through hot-pressing with low-melting-point COP fibers.

[0028] The antibacterial functional layer 1 is 1.2 mm thick and is composed of graphene-modified polyester fibers with a cross-shaped (quadrilobate) cross-section and a single filament fineness of 1.0 dtex. Graphene nanosheets (3-5 nm thick, 200-500 nm transverse dimension) are uniformly dispersed within the fibers, with a content of 0.8 wt%. The cross-shaped cross-section increases the specific surface area and enhances the adhesion of antibacterial agents. Graphene provides electrical conductivity and photothermal antibacterial functions.

[0029] Graphene-modified polyester fiber is prepared by blending graphene oxide dispersion with PET chips, followed by melt spinning and then spinning through a special spinneret (cross-shaped holes) at a spinning temperature of 285℃.

[0030] The fiber surface has a parallel nanogroove structure with a depth of 0.3 μm and a spacing of 1.5 μm. The surface nanogrooves enhance the mechanical destructive effect on bacterial cell walls. Specifically, the fibers are formed by plasma treatment (300 W power, 3 min).

[0031] The fibers are connected by heat-fused joints, with a joint density of 20 per mm. 2 Specifically, the joints are formed using a hot air bonding process (temperature 180℃, wind speed 5m / s).

[0032] The elastic buffer layer 3 is 3.0 mm thick and is formed by interlacing spiral hollow polyester fibers (fineness 1.5 dtex). The fiber hollowness is 35%, the spiral pitch is 4 times the fiber diameter (about 6 μm), and the fiber surface has annular grooves with a depth of 2 μm and a spacing of 10 μm. The porosity is 65% and the pore size distribution is 50-300 μm.

[0033] The spiral structure provides excellent compression resilience, surface grooves enhance inter-fiber friction, and the porous structure absorbs impact energy.

[0034] The specific manufacturing method includes the following steps: special fibers are prepared using hollow spiral spinning technology, a three-dimensional network is formed by a three-dimensional web laying machine, and then heat-set (temperature 150℃, time 5min).

[0035] The reinforcing layer 4 is 1.0 mm thick and is an electrospun PBO fiber web with a fiber diameter of 1.2 μm, a hexagonal honeycomb mesh with a pore size of 150 μm, a porosity of 40%, and a PBO fiber weight ratio of 8%.

[0036] The reinforcement layer 4 has ultra-high strength to provide overall support, and the honeycomb structure optimizes stress distribution and is resistant to high temperatures.

[0037] The interlayer bonding structure uses COP bonding fibers with a distribution density of 5 fibers / mm. 2 The fibers are Y-shaped and branched at a 60° angle. The penetration depth is 0.5 mm for the upper layer and 0.3 mm for the lower layer.

[0038] Each layer is manufactured using the following composite process:

[0039] First, COP fibers (15-25 μm in diameter) are dispersed at a rate of 5 ± 0.5 fibers / mm using an electrostatic dispersion device. 2 The density is evenly distributed on the interlayer interface of the pre-assembled fiber to ensure that the fiber is distributed in a three-dimensional random orientation.

[0040] The process then proceeds with segmented hot pressing: the first stage involves pre-treatment at 110±2℃ and 0.5±0.05MPa for 30 seconds to soften the COP fibers and partially embed them into adjacent layers; the second stage involves raising the temperature to 125±2℃ and maintaining it at 0.8±0.05MPa for 20 seconds to completely melt the COP fibers and form a Y-shaped bifurcated structure (bifurcating angle 55-65°), with the bifurcated ends reaching depths of 0.5±0.1mm in the upper layer and 0.3±0.1mm in the lower layer.

[0041] Finally, a programmed temperature control system was used to gradually cool the layers to room temperature at a rate of 5±0.3℃ / min, while maintaining a constant pressure of 0.3MPa during the cooling process to prevent interlayer deformation. This process resulted in an interlayer peel strength of 5.8-6.2 N / cm and a reduction of residual thermal stress by more than 40%.

[0042] Example 2

[0043] A high-toughness antibacterial non-woven cotton, in addition to the layers mentioned above, includes a transition layer 2 disposed between the antibacterial functional layer 1 and the elastic buffer layer 3. This transition layer 2 is 0.8 mm thick and is composed of a blend of graphene-modified polyester and spiral hollow polyester in a 1:2 ratio. The fibers are distributed in a gradient: preferably, 40% of the graphene fibers are near the antibacterial layer, and 70% are near the buffer layer. The graphene-modified polyester and spiral hollow polyester fibers are mixed using a two-component carding machine, then the gradient distribution is formed using airflow web forming technology, followed by pre-compression setting at 100°C and 0.3 MPa.

[0044] Transition layer 2 is used to mitigate abrupt changes in interlayer properties, promote stress transfer, and prevent interlayer delamination.

[0045] This product is particularly suitable for applications requiring high antibacterial properties and strength, such as medical protective equipment, including surgical gown linings, wound dressing substrates, and medical stretcher pads.

[0046] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, and improvements made without departing from the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A high tenacity antibacterial glueless cotton, characterized in that, It includes a three-layer structure that is compounded sequentially from the surface layer to the bottom layer: The anti-bacterial functional layer is composed of graphene modified polyester fibers, the cross section of the graphene modified polyester fibers is cross-shaped, the single fiber fineness is 0.8-1.2 dtex, the graphene is uniformly dispersed in the form of nanosheets inside the fibers, the fibers are connected through hot fusion points, and the point density is 15-25 / mm 2 ; The elastic buffer layer is a three-dimensional network structure formed by interwoven helical hollow polyester fibers. The helical pitch is 3-5 times the fiber diameter, and the fiber surface has micron-level grooves to increase entanglement points. The porosity of this layer is 60-70%. The reinforcing layer is a PBO fiber web formed by electrospinning, with a fiber diameter of 0.5-2μm and a hexagonal honeycomb mesh with a pore size of 80-200μm. The three-layer structure is achieved by hot-pressing composite with low-melting-point COP fibers.

2. The high tenacity, antibacterial, solvent-free cotton of claim 1, wherein, The antibacterial functional layer has a nanogroove structure with a depth of 0.1-0.5 μm on its fiber surface.

3. The high tenacity, antibacterial, solvent-free cotton of claim 1, wherein, The hollow polyester fiber in the elastic buffer layer has a hollow fiber ratio of 25%-40%.

4. The high tenacity, antibacterial, solvent-free cotton of claim 1, wherein, The distribution density of the low-melting COP fibers is 3-8 fibers / mm 2 .

5. The high tenacity, antibacterial, solvent-free cotton of claim 1, wherein, It also includes a transition layer disposed between the antibacterial functional layer and the elastic buffer layer.

6. The high tenacity, antibacterial, solvent-free cotton of any one of claims 1-5, wherein the cotton has a tenacity of at least 20 cN / dtex. Its total thickness is 2-10 mm, and its density is 0.2-0.4 g / cm³. 3 .

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