Composite interlayer self-repairing drip irrigation tape

Abstract

The utility model provides a composite interlayer self-repairing drip irrigation tape, which relates to the technical field of drip irrigation tapes and comprises a drip irrigation tape main body, the drip irrigation tape main body sequentially comprises an anti-seizure outer layer, a flexible support middle layer and a self-repairing inner layer from outside to inside, the outer side surface of the anti-seizure outer layer is coated with an anti-ultraviolet protective coating, and the outer side surface of the anti-seizure outer layer is coated with an anti-ultraviolet protective coating. The self-repairing inner layer is used for resisting corrosion of the external environment, the inner side surface of the self-repairing inner layer is coated with a hydrophobic anti-adhesion coating and is used for reducing impurity deposition, the flexible supporting middle layer is of a net structure and is used for restraining the expansion direction of the self-repairing inner layer and providing mechanical supporting, and through the design of the self-repairing inner layer (a water-swelling resin layer), the self-repairing inner layer and the flexible supporting middle layer are combined to form a self-repairing layer. When the drip irrigation belt main body is damaged, the drip irrigation belt main body can rapidly absorb water and expand without manual intervention to form a gel-state sealing body to directly fill cracks or loopholes and block a water flow leakage path. Compared with the prior art, the self-repairing speed is greatly improved, and meanwhile the shutdown maintenance frequency is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of drip irrigation tape technology, and in particular to a composite sandwich self-healing drip irrigation tape. Background Technology

[0002] Drip irrigation technology, as a highly efficient and water-saving irrigation method, has been widely used in agricultural production. Traditional drip irrigation tape typically uses a single-layer polyethylene (PE) or polyvinyl chloride (PVC) pipe structure, with drip holes formed through laser perforation or molding processes. However, in practical applications, this type of drip irrigation tape has the following significant drawbacks:

[0003] Traditional drip irrigation tape, once damaged, causes water to leak from the hole, requiring manual shutdown for repair or replacement of the pipe section, resulting in high maintenance costs and delays in irrigation cycles. Although some studies have attempted to coat the inner wall of drip irrigation tape with hot melt adhesive or microcapsule self-healing materials, their response speed is slow (requiring external heating or pressure triggering) and their sealing effect on dynamic leakage is insufficient, making them difficult to adapt to the complex working conditions of farmland. Therefore, we propose a composite sandwich self-healing drip irrigation tape. Utility Model Content

[0004] The purpose of this invention is to provide a composite sandwich self-healing drip irrigation tape to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A composite sandwich self-healing drip irrigation tape includes a drip irrigation tape body, which comprises, from the outside to the inside, an anti-galling outer layer, a flexible support middle layer, and a self-healing inner layer. The outer surface of the anti-galling outer layer is coated with an anti-ultraviolet protective coating to resist external environmental erosion. The inner surface of the self-healing inner layer is coated with a hydrophobic anti-adhesion coating to reduce impurity deposition. The flexible support middle layer has a mesh structure to constrain the expansion direction of the self-healing inner layer and provide mechanical support. Multiple drip holes are spaced along the length of the drip irrigation tape body, and the drip holes connect the self-healing inner layer with the external environment to regulate irrigation water flow.

[0007] As a preferred embodiment of this utility model, the anti-gagging outer layer is made of a polymer composite material, comprising a wear-resistant matrix and embedded reinforcing fibers.

[0008] As a preferred embodiment of this invention, the UV-resistant protective coating is an organosilicon resin.

[0009] As a preferred embodiment of this utility model, the flexible support intermediate layer is composed of a thermoplastic elastomer and a fiber woven mesh.

[0010] As a preferred embodiment of this utility model, the self-healing inner layer is a water-swellable resin layer, and its expanded gel-like substance can fill the cracks or damaged areas around the drip hole.

[0011] As a preferred embodiment of this utility model, the hydrophobic anti-adhesion coating is made of polytetrafluoroethylene.

[0012] As a preferred embodiment of this invention, the drip inlet is covered with a deformable filter screen to intercept large particulate impurities.

[0013] As a preferred embodiment of this utility model, the anti-biting outer layer and the flexible support intermediate layer are integrally connected by a hot-melt welding process, and the flexible support intermediate layer and the self-healing inner layer are bonded by an environmentally friendly adhesive.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this invention, the self-healing inner layer (water-swellable resin layer) allows the drip irrigation tape to quickly absorb water and swell when the main body is damaged, forming a gel-like seal that directly fills cracks or leaks and blocks water leakage paths. Compared with traditional technologies, the self-healing speed is greatly improved, while significantly reducing the frequency of downtime maintenance.

[0016] 2. In this utility model, the dual protection of the anti-ultraviolet protective coating and the hydrophobic anti-adhesion coating effectively resists external ultraviolet erosion and reduces the adhesion of internal impurities. Combined with the mesh constraint structure of the flexible support middle layer, it ensures that the expansion direction of the self-healing inner layer is controllable and maintains the overall compressive strength of the drip irrigation tape, thereby realizing the rapid self-repair of the damaged area and the long-term stable irrigation function. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a composite sandwich self-healing drip irrigation tape provided by this utility model;

[0018] Figure 2 An enlarged schematic diagram of the structure of area A of a composite sandwich self-healing drip irrigation tape provided by this utility model;

[0019] Figure 3 A schematic diagram of the overall internal planar structure of a composite sandwich self-healing drip irrigation tape provided by this utility model;

[0020] Figure 4 This is an enlarged schematic diagram of the structure of zone B of a composite sandwich self-healing drip irrigation tape provided by this utility model.

[0021] Legend: 1. Drip tape body; 101. Anti-galling outer layer; 1011. UV-resistant protective coating; 102. Flexible support middle layer; 103. Self-healing inner layer; 1031. Hydrophobic anti-adhesion coating; 2. Drip holes; 201. Deformable filter. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Example 1

[0027] like Figure 1-4As shown, this utility model provides a technical solution: a composite sandwich self-healing drip irrigation tape, including a drip irrigation tape body 1. The drip irrigation tape body 1 includes, from the outside to the inside, an anti-biting outer layer 101, a flexible support middle layer 102, and a self-healing inner layer 103. The outer surface of the anti-biting outer layer 101 is coated with an anti-ultraviolet protective coating 1011 to resist external environmental erosion. The inner surface of the self-healing inner layer 103 is coated with a hydrophobic anti-adhesion coating 1031 to reduce impurity deposition. The flexible support middle layer 102 has a mesh structure to constrain the expansion of the self-healing inner layer 103. The self-healing inner layer 103 is provided with mechanical support and expansion direction. Multiple drip holes 2 are spaced along the length of the drip irrigation tape body 1. The drip holes 2 connect the self-healing inner layer 103 with the external environment and are used to regulate the irrigation water flow. With the dual protection of the anti-ultraviolet protective coating 1011 and the hydrophobic anti-adhesion coating 1031, it effectively resists external ultraviolet erosion and reduces the adhesion of internal impurities. Combined with the mesh constraint structure of the flexible support middle layer 102, it ensures that the expansion direction of the self-healing inner layer 103 is controllable and maintains the overall compressive strength of the drip irrigation tape, so as to realize the rapid self-repair of the damaged area and the long-term stable irrigation function.

[0028] Example 2

[0029] like Figure 1-4As shown, this utility model provides a technical solution: a composite sandwich self-healing drip irrigation tape. The anti-galling outer layer 101 is made of a high-molecular composite material, comprising a wear-resistant matrix and embedded reinforcing fibers. Through the composite design of the wear-resistant matrix and reinforcing fibers, the tear resistance and mechanical damage resistance of the outer layer are significantly improved, reducing the risk of damage caused by friction and galling during field operations and extending the service life of the drip irrigation tape. The UV-resistant protective coating 1011 is made of silicone resin. The silicone resin coating has excellent anti-aging and weather resistance, and can resist direct sunlight, rain erosion and high temperature for a long time. To prevent coating peeling or substrate degradation caused by temperature changes, the outer layer material is designed to ensure its long-lasting protective performance in outdoor environments. The flexible support interlayer 102 is composed of a thermoplastic elastomer and a fiber woven mesh. The thermoplastic elastomer provides flexibility and resilience to the interlayer, while the fiber woven mesh provides a high-strength support skeleton. The combination of the two prevents excessive expansion and deformation of the inner layer and adapts to the bending deformation requirements during drip tape installation, ensuring structural stability during irrigation. The self-healing inner layer 103 is a water-swellable resin layer. Its expanded gel-like substance can fill cracks or damaged areas around the drip holes 2. When the drip tape body 1 is damaged, the water-swellable resin quickly absorbs water and expands to form a gel-like seal, automatically filling cracks or holes around the drip holes 2, blocking water leakage paths, and achieving rapid self-repair without manual intervention; the hydrophobic and anti-adhesion coating 1031 is made of polytetrafluoroethylene (PTFE). The high hydrophobicity and low surface energy of the PTFE coating effectively reduce the deposition and adhesion of scale, silt, and other impurities on the inner surface, reducing the probability of drip hole 2 clogging and maintaining smooth irrigation water flow; the drip hole 2 inlet is covered with a deformable filter 201 to intercept large particles of impurities, which can be adjusted... The shaped filter screen 201 dynamically adjusts its opening and closing state according to the water flow pressure, which not only intercepts large particles of impurities to prevent the drip holes 2 from clogging, but also prevents the rigid filter screen from being obstructed by local water flow due to the accumulation of impurities. The anti-seize outer layer 101 and the flexible support middle layer 102 are integrated by a heat fusion process, and the flexible support middle layer 102 and the self-healing inner layer 103 are bonded by an environmentally friendly adhesive. The heat fusion process achieves a high-strength seamless connection between the outer layer and the middle layer, and the environmentally friendly adhesive ensures that the middle layer and the inner layer are firmly bonded without the risk of pollution. The combination of the two takes into account both structural reliability and environmental safety.

[0030] The working process of this utility model is as follows: When using a composite sandwich self-healing drip irrigation tape, the irrigation water flows into the inner side of the self-healing inner layer 103 from the drip irrigation tape inlet, flows over the surface of the hydrophobic anti-adhesion coating 1031, and due to the low surface energy characteristics of the coating, scale, silt and other impurities are difficult to adhere, reducing the risk of inner wall contamination. The water flow is evenly diffused in the self-healing inner layer 103. Multiple drip holes 2 are spaced along the length of the drip irrigation tape body 1, connecting the self-healing inner layer 103 with the external environment and used to regulate the irrigation water flow. A deformable filter screen 201 is covered at the inlet of the drip hole 2 to intercept large particles of impurities. The deformable filter screen 201 dynamically adjusts its opening and closing state according to the water flow pressure, which not only intercepts large particles of impurities to prevent the drip hole 2 from clogging, but also prevents the rigid filter screen from being obstructed by local water flow due to the accumulation of impurities. The flexible support mesh of the middle layer 102 The structure provides mechanical constraint to the self-healing inner layer 103, preventing it from undergoing irregular expansion and deformation due to water pressure. At the same time, the grid pores evenly distribute the water pressure, ensuring a stable water flow rate from the drip hole 2. The UV-resistant protective coating 1011 on the surface of the anti-galling outer layer 101 resists sunlight, rain, and temperature changes, enhancing the outer layer's anti-aging ability. The wear-resistant matrix and reinforcing fiber composite structure of the outer layer reduces damage caused by mechanical friction or rodent gnawing during field operations. The self-healing inner layer 103 is a water-swellable resin layer. Its expanded gel-like substance can fill the cracks or damaged areas around the drip hole 2. When the drip irrigation tape body 1 is damaged, the water-swellable resin quickly absorbs water and expands to form a gel-like seal, automatically filling the cracks or leaks around the drip hole 2, blocking the water leakage path, and achieving a rapid self-healing function without manual intervention.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite sandwich self-healing drip irrigation tape, comprising a drip irrigation tape body (1), characterized in that: The drip irrigation tape body (1) includes, from the outside to the inside, an anti-biting outer layer (101), a flexible support middle layer (102), and a self-healing inner layer (103). The outer surface of the anti-biting outer layer (101) is coated with an anti-ultraviolet protective coating (1011) to resist external environmental erosion. The inner surface of the self-healing inner layer (103) is coated with a hydrophobic anti-adhesion coating (1031) to reduce impurity deposition. The flexible support middle layer (102) has a mesh structure to constrain the expansion direction of the self-healing inner layer (103) and provide mechanical support. Multiple drip holes (2) are spaced through the drip irrigation tape body (1) along the length direction. The drip holes (2) connect the self-healing inner layer (103) with the external environment and are used to regulate irrigation water flow.

2. The composite sandwich self-healing drip irrigation tape according to claim 1, characterized in that: The UV-resistant protective coating (1011) is made of silicone resin.

3. The composite sandwich self-healing drip irrigation tape according to claim 1, characterized in that: The self-healing inner layer (103) is a water-swellable resin layer, and its expanded gel-like substance can fill the cracks or damaged areas around the drip hole (2).

4. The composite sandwich self-healing drip irrigation tape according to claim 1, characterized in that: The hydrophobic anti-adhesion coating (1031) is made of polytetrafluoroethylene.

5. The composite sandwich self-healing drip irrigation tape according to claim 1, characterized in that: The inlet of the drip hole (2) is covered with a deformable filter screen (201) to intercept large particulate impurities.

6. The composite sandwich self-healing drip irrigation tape according to claim 1, characterized in that: The anti-biting outer layer (101) and the flexible support intermediate layer (102) are integrally connected by a hot-melt welding process, and the flexible support intermediate layer (102) and the self-healing inner layer (103) are bonded by an environmentally friendly adhesive.

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