Composite nanofiber membrane with adjustable structure

Abstract

The utility model discloses a composite nanofiber membrane with an adjustable structure, which comprises a tensile deformation middle layer, and electrostatic spinning polyurethane nanofiber membrane layers are arranged on the upper side and the lower side of the tensile deformation middle layer. According to the utility model, the 3D printed honeycomb-like middle layer is introduced, so that the material is endowed with remarkable tensile expansion performance and three-dimensional deformation capability. By adjusting geometric parameters (such as unit density and size) of the honeycomb structure, mechanical property customization of the membrane body in different application scenes is realized, and the membrane body can adapt to various complex use conditions, such as high strength and deformability required in flexible electronic and biomedical equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of textiles, especially to a composite nanofiber membrane with adjustable structure. BACKGROUND

[0002] Electrospinning is a mature technology for preparing nanofiber membranes, widely used in air filtration, water purification, medical dressings, etc. [1] Electrospun nanofiber membranes have high specific surface area, good flexibility and controllable fiber diameter. However, such single-layer nanofiber membranes have obvious limitations in mechanical properties (such as tensile resistance) and the formation of three-dimensional structures, making it difficult to meet the application scenarios that require complex mechanical behavior (such as auxetic properties) or multi-functional requirements.

[0003] Three-dimensional printing technology is widely used to manufacture structural materials with complex geometries and specific mechanical properties, such as honeycomb structures or corrugated materials; these materials exhibit excellent performance in cushioning, support, and deformation recovery, but are usually made of single hard materials, lacking flexibility and difficult to meet the application requirements of multi-functional composite materials. In addition, there are few technologies for combining existing three-dimensional structural materials with flexible nanofiber membranes, and the compatibility requirements for structural design and preparation process are high, and materials with multi-layer composite structure and performance regulation capability have not been fully developed.

[0004] Composite membrane materials achieve performance stacking by combining multiple functional materials, such as multi-layer filtration membranes and composite separators. However, most composite membranes use chemical or physical methods to bond different layers of materials, and the structural design is single, making it difficult to simultaneously achieve high flexibility, auxetic properties, and regulation of three-dimensional structures. Especially for scenarios requiring dynamic mechanical properties (such as auxetic properties), there is currently no ideal solution. SUMMARY

[0005] In view of the above, to solve the problems of insufficient design and performance of composite nanofiber membranes and three-dimensional structural materials, the utility model provides a composite nanofiber membrane with adjustable structure.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A composite nanofiber membrane with adjustable structure, comprising a stretchable and deformable intermediate layer, and electrospun polyurethane nanofiber membrane layers are arranged on the upper and lower sides of the stretchable and deformable intermediate layer.

[0008] As a further improvement of the above technical solutions:

[0009] Preferably, the stretchable and deformable intermediate layer is composed of a plurality of structural units, a single structural unit comprising an intermediate connector, a peripheral connector connected to the intermediate connector, and the peripheral connector being connected to the intermediate connector of an adjacent structural unit.

[0010] Preferably, the intermediate connector is in the shape of a triangular prism, the peripheral connector is in the shape of a triangular pyramid, and the three corners of the intermediate connector are each connected to two peripheral connectors.

[0011] Preferably, the stretchable and deformable intermediate layer is in a honeycomb structure after being stretched and deformed.

[0012] Compared with the prior art, the stretchable and deformable intermediate layer has the following beneficial effects:

[0013] The stretchable and deformable intermediate layer of the present application introduces a 3D printed honeycomb intermediate layer, which gives the material significant auxetic properties and three-dimensional deformation ability. By adjusting the geometric parameters (such as unit density and size) of the honeycomb structure, the mechanical properties of the membrane body in different application scenarios are customized, which can adapt to various complex use conditions, such as high strength and deformation ability required in flexible electronics and biomedical devices.

[0014] The upper and lower layers of electrospun nanofiber membranes provide functional properties, while the intermediate layer honeycomb structure achieves a balance between mechanical properties and functionality. The synergistic optimization of structural design and material selection significantly improves the functional integration capability, while meeting the multiple requirements of high efficiency and dynamic stress resistance, suitable for a wide range of industrial filtration and high-performance separation scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view of the overall sectional structure of the present application;

[0016] Figure 2 is a schematic view of the initial state structure of the stretchable and deformable intermediate layer under one parameter of the present application;

[0017] Figure 3 is a schematic view of the stretched state structure of the stretchable and deformable intermediate layer under one parameter of the present application;

[0018] Figure 4 is a schematic view of the initial state structure of the stretchable and deformable intermediate layer under two parameters of the present application;

[0019] Figure 5 is a schematic view of the stretched state structure of the stretchable and deformable intermediate layer under one parameter of the present application;

[0020] Figure 6 is a schematic view of the structure parameters of the present application.

[0021] In the figure: 1, stretchable deformation intermediate layer; 11, intermediate connector; 12, peripheral connector; 2, electrospun polyurethane nanofiber membrane layer; 3, two-component polyurethane adhesive layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0023] In the description of the present application, unless otherwise specified, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The technical solution is shown in the accompanying Figure 1 The main core point of the technical solution is the stretchable deformation intermediate layer 1, which is connected to the electrospun polyurethane nanofiber membrane layer 2 through the two-component polyurethane adhesive layer 3 at the upper and lower ends of the stretchable deformation intermediate layer 1.

[0026] The electrospun polyurethane nanofiber membrane layer 2 provides high specific surface area, good air permeability and filtration performance.

[0027] The stretchable deformation intermediate layer 1 mainly uses 3D printing technology to realize precise geometric structure control, so that different mechanical requirements can be met by adjusting the printing parameters to prepare a special honeycomb structure similar to an egg box after stretching, which has adjustable auxetic properties, can enhance the overall mechanical properties, and can also impart three-dimensional deformation capability to the membrane body.

[0028] The main shape is shown in the accompanying Figure 2 to the accompanying Figure 5 , the accompanyingFigure 2 With the attached Figure 4 For the initial state, only because of the different structure parameters resulting in the same, such as the structure parameters shown in the attached Figure 6 The distance and the angle of the cutting point, the difference between the position and the length of the cutting point, the difference between the angle, result in the different size after stretching, so that by changing the structure parameters, the size after stretching can be changed under the condition of the initial size unchanged.

[0029] As shown in the attached Figure 3 With the attached Figure 5 As shown in the attached, for the stretched state, it can be known from the drawings that the stretchable deformation intermediate layer 1 is mainly composed of a plurality of structural units, and the single structural unit is mainly a triangular prism-shaped intermediate connector 11, and two triangular peripheral connectors 12 are connected to the three corners of the intermediate connector 11, respectively. It can be seen that the six triangular bodies each provide an edge to form a hexagon, and the other three corners of the peripheral connector 12 of the triangular body are connected with the intermediate connector 11 of the adjacent structural unit, thereby forming a honeycomb shape.

[0030] As shown in the attached Figure 2 With the attached Figure 3 , the attached Figure 4 With the attached Figure 5 It can be known that the movement of the intermediate connector 11 and the rotation of the peripheral connector 12 occur, and the main reason for the deformation is that the electrospun polyurethane nanofiber membrane has good elasticity, and the stretching allows small amplitude torsion.

[0031] The combination process of the technical solution:

[0032] The upper and lower electrospun polyurethane nanofiber membrane layers 2 and 3 prepared by electrospinning are combined with the intermediate layer by 3D printing in the following two ways: chemical combination: coating a two-component polyurethane adhesive on the surface of the intermediate layer to enhance the interlayer bonding force. Physical embedding: design a microstructure embedding groove on the edge of the intermediate layer to realize mechanical locking and improve the adhesion.

[0033] After combination, heat pressing treatment is carried out at 70-80℃ environment to promote the curing of the adhesive and improve the stability and uniformity of the overall composite film.

[0034] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A structurally regulatable composite nanofiber membrane, characterized by, The stretchable and deformable intermediate layer (1) is provided with electrostatic spinning polyurethane nanofiber membrane layers (2) on both sides.

2. The structure-controllable composite nanofiber membrane according to claim 1, wherein, The stretchable and deformable intermediate layer (1) is composed of a plurality of structural units, and each structural unit comprises an intermediate connector (11) and a peripheral connector (12) connected to the intermediate connector (11), and the peripheral connector (12) is connected to the intermediate connector (11) of an adjacent structural unit.

3. The structure-controllable composite nanofiber membrane according to claim 2, wherein, The intermediate connector (11) is in the shape of a triangular prism, the peripheral connector (12) is in the shape of a triangular prism, and the three corners of the intermediate connector (11) are connected to two peripheral connectors (12).

4. The structure-controllable composite nanofiber membrane according to claim 3, wherein, The stretchable and deformable intermediate layer (1) is in a honeycomb structure after being stretched and deformed.

5. The structure-controllable composite nanofiber membrane according to claim 1, wherein, A bicomponent polyurethane adhesive layer (3) is arranged between the stretchable and deformable intermediate layer (1) and the electrostatic spinning polyurethane nanofiber membrane layer (2).

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