Multi-mode flexible bionic adhesion material with dynamic adhesion and directional perspiration functions

Abstract

The invention belongs to the field of bionic adhesion materials, provides a multi-mode flexible bionic adhesion material with dynamic adhesion and directional perspiration, and is used for solving the problem that an existing bionic adhesion material is difficult to consider high adhesion, high perspiration and air permeability and low skin irritation at the same time. The device is composed of three cores including a conical perspiration pore channel, a capillary pore channel and a suction cup structure, the conical perspiration pore channel achieves directional sweat conveying through Laplace pressure difference, the micro suction cup structure achieves reversible skin adhesion based on the negative pressure adsorption principle, and the capillary pore channel promotes spreading and evaporation of sweat through the capillary action; in conclusion, the functional integration of skin interface adhesion and active perspiration is realized on the micron scale; moreover, each functional unit is subjected to accurate geometric parameter matching and spatial arrangement optimization, so that the flexible bionic adhesion material has both mechanical suitability and physiological comfort in wearing application.

Description

Technical Field

[0001] The present invention belongs to the field of bionic adhesive materials, and specifically provides a multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration, which is suitable for application fields such as smart wearable devices, sports medical protective gear and bioelectronic skin. Background Art

[0002] With the rapid development of smart wearable devices, sports medical protective gear, and bioelectronic skin, the demand for biomimetic adhesive materials is increasing. Existing biomimetic adhesion technologies are mainly divided into two major directions: dry adhesion and wet adhesion. Dry adhesion technology refers to adhesion achieved through intermolecular forces (such as van der Waals forces) or mechanical interlocking in a dry environment without the participation of liquid media; wet adhesion is to fill the interface gaps with liquid media (such as water, mucus or glue) to form an adhesion layer. Wet adhesion technologies (such as pressure-sensitive adhesives) rely on chemical adhesives and have drawbacks such as strong skin irritation and non-reusability. Dry adhesion technologies (such as those using end-expanded structures) often struggle to achieve high adhesion, high perspiration-wicking breathability, and low skin irritation due to structural density limitations or material property constraints. High adhesion relies on close interfacial contact, which means sacrificing breathability, while breathable structures can lead to decreased adhesion. This contradiction greatly limits long-term wear comfort and functionality, especially in applications such as medical monitoring and motion sensing that require high-precision signal acquisition. Traditional adhesive materials are prone to performance degradation due to sweat accumulation or repeated peeling. Therefore, there is an urgent need to develop a new biomimetic adhesion mechanism that can simultaneously achieve high adhesion, high perspiration-wicking breathability, and low skin irritation in biomimetic adhesive materials, thereby filling the technical gap in long-term reliable adhesion and human compatibility for wearable devices. Summary of the Invention

[0003] The purpose of the present invention is to provide a multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration, which is used to solve the problem that existing bionic adhesive materials are difficult to achieve high adhesion, high perspiration permeability and low skin irritation.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration, comprising: a base layer, conical perspiration channels, capillary channels and a suction cup structure; wherein the conical perspiration channels are truncated cone-shaped channels arranged through the base layer, the upper bottom surface of the truncated cone-shaped channels are located on the upper surface of the base layer, and the lower bottom surface of the truncated cone-shaped channels are located on the upper surface of the base layer; a plurality of conical perspiration channels are evenly arranged in the base layer in a hexagonal array structure, and a suction cup structure is provided at the center position of each hexagonal unit, and the suction cup structure is a cylindrical cavity opened on the lower surface of the base layer; the capillary channels are connected to the conical perspiration channels in a one-to-one correspondence, and the capillary channels are cylindrical channels, which are extended upward from the upper bottom surface of the conical perspiration channels.

[0006] Furthermore, the base layer is made of a flexible polymer material or a natural flexible material, and both the flexible polymer material and the natural flexible material are hydrophilically modified.

[0007] Furthermore, the flexible polymer material is specifically polydimethylsiloxane (PDMS) or polyurethane (PU), and the natural flexible material is specifically silk protein or gelatin.

[0008] Furthermore, the height (thickness) of the base layer is 1200 micrometers.

[0009] Furthermore, the upper bottom surface diameter of the conical perspiration channel is 250 microns, and the lower bottom surface diameter is 750 microns.

[0010] Furthermore, the capillary channel has a diameter of 250 microns and a height of 50 microns.

[0011] Furthermore, the suction cup structure has a diameter of 100 microns and a height of 100 microns.

[0012] Furthermore, the upper surface of the base layer is the air contact surface, and the lower surface is the skin contact surface.

[0013] In terms of working principle, the present invention provides a multimodal flexible biomimetic adhesive material that combines dynamic adhesion and directional perspiration. It uses truncated cone-shaped channels set throughout the base layer as conical perspiration channels. The conical perspiration channels are evenly distributed throughout the base layer in a hexagonal array structure. The conical perspiration channels use the Laplace pressure difference to transport sweat from the skin end to the air end. Laplace pressure is a physical quantity that describes the pressure difference on both sides of a curved liquid surface. The basic formula is: is the surface tension of the liquid (unit: N / m), R1 and R2 are the main curvature radii of the liquid surface in two orthogonal directions (unit: m); at the same time, the capillary pores spread the sweat at the air end to the upper surface of the bionic adhesive material through capillary force, so that the gas-liquid interface is expanded, the evaporation of sweat is accelerated and the heat is taken away; in addition, a suction cup structure is arranged at the center of the hexagonal unit of the hexagonal array structure, and the suction cup structure is located at the junction of the bionic adhesive material and the skin. When used, part of the air inside the suction cup is discharged by lightly pressing, and a negative pressure is formed in the suction cup cavity. The negative pressure state causes the edge of the suction cup to generate a uniform circumferential sealing force, and a stable vacuum adsorption area is formed between the inner wall of the suction cup and the skin, thereby achieving adhesion to the human skin; based on this, the present invention fully simulates the adsorption principle of the octopus suction cup in nature and the drainage principle of the bird's beak to obtain a multimodal flexible bionic adhesive material with the advantages of high adhesion, high sweat permeability and low skin irritation.

[0014] In summary, the beneficial effects of the present invention are:

[0015] 1) The micron-scale perspiration channels with a conical frustum structure generate a Laplace pressure difference through precisely controlled geometric gradients, achieving directional transport of sweat from the skin end to the air end. At the same time, the conical perspiration channels are connected through capillary channels to spread sweat from the air end to the upper surface of the biomimetic adhesive material, expanding the gas-liquid interface, accelerating sweat evaporation, and improving sweat evaporation efficiency.

[0016] 2) A multimodal bionic structure is adopted, combining the negative pressure adsorption principle of the octopus suction cup with the drainage principle of the bird's beak. The micro suction cup structure and conical perspiration channels are integrated and arranged in a hexagonal array. This improves space utilization while achieving adhesion and directional perspiration functions, thereby enhancing wearing comfort.

[0017] 3) The use of flexible base materials not only allows it to closely fit the curves of the human body and is suitable for a variety of dynamic and static scenarios, but the materials are also biocompatible, avoiding allergic reactions and other discomfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the unit structure of the multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration in the present invention.

[0019] Figure 2 It is a cross-sectional schematic diagram of the multimodal flexible bionic adhesive material of the present invention having both dynamic adhesion and directional perspiration.

[0020] Figure 3 Schematic cross-sectional view of the multimodal flexible biomimetic adhesive material of the present invention having both dynamic adhesion and directional perspiration removal. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0022] This embodiment provides a multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration removal, such as Figure 1 and Figure 2 As shown, it specifically includes: a base layer, a conical perspiration channel, a capillary channel and a suction cup structure; wherein, the conical perspiration channel adopts a truncated cone-shaped channel arranged through the base layer, the upper bottom surface of the truncated cone-shaped channel is located on the upper surface of the base layer, and the lower bottom surface of the truncated cone-shaped channel is located on the upper surface of the base layer; a number of conical perspiration channels are evenly arranged in the base layer in a hexagonal array structure, and a suction cup structure is respectively arranged at the center position of each hexagonal unit, and the suction cup structure adopts a cylindrical cavity opened on the lower surface of the base layer; the capillary channels are connected to the conical perspiration channels one by one, and the capillary channels adopt cylindrical channels, and the cylindrical channels are extended upward from the upper bottom surface of the conical perspiration channels.

[0023] Furthermore, the base layer is made of flexible polymer materials such as polydimethylsiloxane (PDMS) and polyurethane (PU) or natural flexible materials such as silk protein and gelatin, and both the flexible polymer materials and the natural flexible materials are hydrophilically modified (such as chemical grafting modification).

[0024] Furthermore, the height (thickness) of the base layer is 1200 microns, the upper bottom diameter of the conical perspiration channel is 250 microns, the lower bottom diameter is 750 microns, the capillary channel has a diameter of 250 microns and a height of 50 microns, and the suction cup structure has a diameter of 100 microns and a height of 100 microns. Figure 3 shown.

[0025] Furthermore, multimodal flexible biomimetic adhesive materials can be prepared using processes such as template method, photolithography or soft lithography.

[0026] In summary, the present invention provides a multimodal flexible bionic adhesive material that combines dynamic adhesion and directional perspiration, including three core components: a conical perspiration channel, a capillary channel, and a suction cup structure. The conical perspiration channel realizes directional transport of sweat through Laplace pressure difference, the micro suction cup structure realizes reversible skin adhesion based on the negative pressure adsorption principle, and the capillary channel promotes the spreading and evaporation of sweat by capillary action. The present invention innovatively combines the negative pressure adsorption mechanism of the octopus suction cup with the gradient channel drainage principle of the bird's beak, realizing the functional integration of skin interface adhesion and active perspiration at the micrometer scale; moreover, each functional unit ensures that the flexible bionic adhesive material has both mechanical adaptability and physiological comfort in wearable applications through precise geometric parameter matching and spatial layout optimization.

[0027] The above description is only a specific embodiment of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration removal, comprising: A base layer, a conical perspiration channel, a capillary channel and a suction cup structure; it is characterized in that the conical perspiration channel adopts a truncated cone-shaped channel arranged through the base layer, the upper bottom surface of the truncated cone-shaped channel is located on the upper surface of the base layer, and the lower bottom surface of the truncated cone-shaped channel is located on the upper surface of the base layer; a number of conical perspiration channels are evenly arranged in the base layer in a hexagonal array structure, and a suction cup structure is respectively arranged at the center position of each hexagonal unit, and the suction cup structure adopts a cylindrical cavity opened on the lower surface of the base layer; the capillary channel is connected to the conical perspiration channel one by one, the capillary channel adopts a cylindrical channel, and the cylindrical channel is extended upward from the upper bottom surface of the conical perspiration channel.

2. The multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The base layer is made of flexible polymer material or natural flexible material, and both the flexible polymer material and the natural flexible material are hydrophilically modified.

3. The multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration according to claim 2, characterized in that: The flexible polymer material is specifically polydimethylsiloxane or polyurethane, and the natural flexible material is specifically silk protein or gelatin.

4. The multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The height of the base layer is 1200 microns.

5. The multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The upper bottom surface diameter of the conical perspiration channel is 250 microns, and the lower bottom surface diameter is 750 microns.

6. The multimodal flexible bionic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The capillary channel has a diameter of 250 microns and a height of 50 microns.

7. The multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The suction cup structure has a diameter of 100 microns and a height of 100 microns.

8. The multimodal flexible biomimetic adhesive material with both dynamic adhesion and directional perspiration according to claim 1, characterized in that: The upper surface of the base layer is the air contact surface, and the lower surface is the skin contact surface.

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