Anti-falling adhesive structure

Abstract

The utility model discloses an anti-falling adhesive structure which comprises a first base material, at least one groove structure is arranged on the adhesive surface of the first base material, the cross section of the groove structure is trapezoid, square or dovetail-shaped, the groove depth is 0.1-1.5 mm, and the groove width is 0.2-2mm; the groove structure is filled with the adhesive layer, and the adhesive layer is connected with the other adhered second base material; after the adhesive layer is cured, a mechanical inverted buckle matched with the groove structure in shape is formed, and the embedding depth of the mechanical inverted buckle is larger than 50% of the depth of the groove structure. According to the utility model, the anti-falling performance is obviously improved; a mechanical back-off structure and chemical bonding have a synergistic effect, so that an adhesive interface is not easy to layer when bearing tensile force or shear force; the groove structure is flexible in design, and the shape and the density can be adjusted according to different base materials and stress requirements; the process is simple, only the groove structure needs to be pre-machined on the surface of the base material, and complex equipment or additional materials are not needed; the durability is enhanced; and a mechanical interlocking structure can slow down the aging of the adhesive layer or the bonding failure caused by environmental factors.

Description

Technical Field

[0001] This utility model relates to the field of material bonding technology, and in particular to an anti-detachment adhesive structure. Background Technology

[0002] Existing adhesive structures primarily rely on the adhesive strength of the glue itself to connect components. However, during prolonged use or in extreme environments such as high and low temperatures, the glue is prone to failure, leading to loosening or even detachment of components. This problem is particularly prominent in fields such as aerospace, automotive, and electronic equipment, severely impacting product reliability and lifespan. Utility Model Content

[0003] This invention provides an anti-detachment adhesive structure that combines high peel strength, fatigue resistance, and processability. It achieves dual bonding reinforcement through a specially shaped groove structure and the mechanical interlocking effect of the cured adhesive layer. The purpose of this invention is to provide an anti-detachment adhesive structure that solves the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An anti-detachment adhesive structure, comprising:

[0006] The first substrate has at least one groove structure on its adhesive surface. The cross-section of the groove structure is trapezoidal, dovetail-shaped, or square. The groove depth is 0.1-1.5 mm and the groove width is 0.2-2 m.

[0007] An adhesive layer is filled within the groove structure and connected to another second substrate to be bonded;

[0008] After the adhesive layer cures, it forms a mechanical buckle that matches the shape of the groove structure. The embedding depth of the mechanical buckle is greater than 50% of the depth of the groove structure.

[0009] In some specific embodiments, the slot structures are arranged in an alternating array, a wave-shaped continuous distribution, or a radial distribution, with the spacing between adjacent slots being 1-5 times the slot width.

[0010] In some specific embodiments, the first substrate is a metal, engineering plastic or fiber-reinforced composite material, and its surface is treated by sandblasting, chemical etching or laser engraving, with a surface roughness Ra≥3.2μm.

[0011] In some specific embodiments, the adhesive layer is an epoxy resin, polyurethane, or acrylate adhesive, which has a Shore hardness of D50-D90 after curing and a peel strength from the first substrate of ≥15N / mm.

[0012] In some specific embodiments, the angle between the sidewall and the bottom surface of the groove structure is 30°-80°, and the bottom of the groove is provided with at least one pit with a diameter of 0.1-0.5 mm and a depth of 10%-30% of the groove depth.

[0013] In some specific embodiments, auxiliary anchors are also included, which are metal mesh or fiber cloth embedded in the groove structure, and the auxiliary anchors and adhesive layers form a three-dimensional interlocking structure.

[0014] The beneficial effects of this utility model are as follows: This utility model discloses an anti-detachment adhesive structure, comprising: a first substrate, the adhesive surface of which is provided with at least one groove structure, the cross-section of the groove structure being trapezoidal or dovetail-shaped, the groove depth being 0.1-1.5mm, and the groove width being 0.2-2mm; an adhesive layer, filling the groove structure and connecting to another second substrate to be bonded; after the adhesive layer cures, it forms a mechanical interlock that matches the shape of the groove structure, the embedding depth of the mechanical interlock being greater than 50% of the groove structure depth. This utility model significantly improves anti-detachment performance: the mechanical interlock structure and chemical bonding work synergistically, making the adhesive interface less prone to delamination when subjected to tensile or shear forces; it has wide adaptability: the groove structure design is flexible, and its shape and density can be adjusted according to different substrates and stress requirements; the process is simple: only the groove structure needs to be pre-processed on the substrate surface, without the need for complex equipment or additional materials; and its durability is enhanced: the mechanical interlocking structure can slow down adhesive layer aging or bonding failure caused by environmental factors (such as thermal expansion and contraction). Attached Figure Description

[0015] Figure 1 This utility model discloses a cross-sectional structural diagram of an anti-detachment adhesive structure.

[0016] In the attached diagram, 1 represents the first substrate; 2 represents the second substrate; and 3 represents the mechanical snap-fit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0018] Reference Figure 1 The illustrated anti-detachment adhesive structure includes:

[0019] The first substrate 1 has at least one groove structure on its adhesive surface. The cross-section of the groove structure is trapezoidal or dovetail-shaped, the groove depth is 0.1-1.5mm, and the groove width is 0.2-2mm. It should be noted that during construction, the cross-section of the groove structure can also be designed as square depending on the actual application. The groove depth and width are designed according to the actual application, stress, and size.

[0020] An adhesive layer is filled within the groove structure and connected to another second substrate 2 that is being bonded;

[0021] After the adhesive layer cures, it forms a mechanical buckle 3 that matches the shape of the groove structure. The embedding depth of the mechanical buckle 3 is greater than 50% of the depth of the groove structure.

[0022] In this embodiment, it should be noted that the groove structure is designed parametrically: the adhesive surface of the first substrate 1 is provided with a groove structure with a trapezoidal / dovetail cross-section, a groove depth of 0.1-1.5mm, a groove width of 0.2-2mm, an angle of 30°-80° between the sidewall and the bottom surface, and a pit (0.1-0.5mm in diameter and 10%-30% of the groove depth) is provided at the bottom of the groove; the groove structure is arranged in an alternating array, a wavy continuous distribution, or a radial distribution, and the spacing between adjacent grooves is 1-5 times the groove width.

[0023] Adhesive layer performance enhancement:

[0024] Using epoxy resin / polyurethane / acrylate adhesive with a Shore hardness of D50-D90, after curing, a mechanical undercut 3 is formed that matches the shape of the groove structure, with an embedding depth >50% of the groove depth;

[0025] The peel strength between the adhesive layer and the substrate is ≥15 N / mm (ASTM D1876 standard test).

[0026] Auxiliary reinforcement structure:

[0027] Metal mesh / fiber cloth is embedded in the groove to form a three-dimensional interlock;

[0028] The contact surfaces of the first substrate 1 and the second substrate 2 are provided with complementary protrusions and grooves, with a fit tolerance of ±0.05mm.

[0029] In some specific embodiments, the slot structures are arranged in an alternating array, a wave-shaped continuous distribution, or a radial distribution, with the spacing between adjacent slots being 1-5 times the slot width.

[0030] In some specific embodiments, the first substrate 1 is a metal, engineering plastic or fiber-reinforced composite material, and its surface is treated by sandblasting, chemical etching or laser engraving, with a surface roughness Ra≥3.2μm.

[0031] In some specific embodiments, the adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, which has a Shore hardness of D50-D90 after curing and a peel strength to the first substrate 1 of ≥15N / mm.

[0032] In some specific embodiments, the angle between the sidewall and the bottom surface of the groove structure is 30°-80°, and the bottom of the groove is provided with at least one pit with a diameter of 0.1-0.5 mm and a depth of 10%-30% of the groove depth.

[0033] In some specific embodiments, auxiliary anchors are also included, which are metal mesh or fiber cloth embedded in the groove structure, and the auxiliary anchors and adhesive layers form a three-dimensional interlocking structure.

[0034] In some specific embodiments, the contact surfaces of the first substrate 1 and the second substrate 2 to be bonded are provided with complementary protrusions and grooves, and the tolerance between the height of the protrusions and the depth of the grooves is ±0.05mm.

[0035] Example 1 (Metal-Composite Material Bonding)

[0036] Substrate pretreatment:

[0037] The aluminum alloy substrate surface is laser-engraved with a dovetail groove structure (0.8mm deep, 1.2mm wide, and 60° sidewall angle), and the surface is sandblasted to Ra=4.1μm;

[0038] The carbon fiber composite substrate has raised surfaces with a height tolerance of ±0.03mm.

[0039] Adhesive bonding process:

[0040] Apply two-component epoxy adhesive (Shore hardness D75 after curing) and apply pressure of 0.5MPa to ensure the adhesive fully fills the tank structure;

[0041] Curing at 80℃ for 2 hours forms mechanical inverted clips 3 (embedded depth 0.6mm).

[0042] Performance testing:

[0043] Peel strength: 19.3 N / mm (compared to 11.2 N / mm for the ungrooved sample);

[0044] After 1000 thermal cycles, the strength retention rate is 93.5%.

[0045] This utility model can be widely applied to:

[0046] Automotive manufacturing: Bonding of lightweight body materials (aluminum alloy / carbon fiber);

[0047] Electronic devices: Waterproof and sealed connection between metal casing and plastic components;

[0048] Aerospace: High-strength connection between composite skin and skeleton structure.

[0049] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0050] This utility model discloses an anti-detachment adhesive structure, comprising: a first substrate 1, the adhesive surface of which is provided with at least one groove structure, the cross-section of the groove structure being trapezoidal or dovetail-shaped, the groove depth being 0.1-1.5mm, and the groove width being 0.2-2mm; an adhesive layer, filling the groove structure and connecting to another second substrate 2 to be bonded; after the adhesive layer cures, it forms a mechanical buckle 3 that matches the shape of the groove structure, the embedding depth of the mechanical buckle 3 being greater than 50% of the groove structure depth. This utility model significantly improves anti-detachment performance: the mechanical buckle 3 structure works synergistically with chemical bonding, making the adhesive interface less prone to delamination under tensile or shear forces; it has wide adaptability: the groove structure design is flexible, and its shape and density can be adjusted according to different substrates and stress requirements; the process is simple: only the groove structure needs to be pre-processed on the substrate surface, without the need for complex equipment or additional materials; and its durability is enhanced: the mechanical interlocking structure can slow down adhesive layer aging or bonding failure caused by environmental factors (such as thermal expansion and contraction).

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A detaching-preventing adhesive structure characterized by comprising: The application relates to a first substrate (1) with a groove structure on the adhesive surface, the cross section of the groove structure is trapezoidal, dovetail-shaped or square, the groove depth is 0.1-1.5 mm, and the groove width is 0.2-2 mm; an adhesive layer is filled in the groove structure and connected with a second substrate (2) to be bonded; the adhesive layer is solidified to form a mechanical undercut (3) matching the shape of the groove structure, and the embedding depth of the mechanical undercut (3) is greater than 50% of the groove depth. The groove structures are arranged in an interlaced array, a wave-shaped continuous distribution or a radial distribution, and the distance between adjacent grooves is 1-5 times the groove width. The first substrate (1) is metal, engineering plastic or fiber-reinforced composite material, and the surface is treated by sand blasting, chemical etching or laser engraving, and the surface roughness Ra is greater than or equal to 3.2 mu m. The adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, and the Shore hardness after solidification is D50-D90, and the peeling strength with the first substrate (1) is greater than or equal to 15 N / mm.

2. The anti-drop adhesive structure according to claim 1, wherein The groove structure is arranged in an interlaced array, a wave-shaped continuous distribution or a radial distribution, and the distance between adjacent grooves is 1-5 times the groove width.

3. The anti-shedding adhesive construction according to claim 1, wherein The first substrate (1) is metal, engineering plastic or fiber-reinforced composite material, and the surface is treated by sand blasting, chemical etching or laser engraving, and the surface roughness Ra is greater than or equal to 3.2 mu m.

4. The anti-shedding adhesive construction according to claim 1, wherein The adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, and the Shore hardness after solidification is D50-D90, and the peeling strength with the first substrate (1) is greater than or equal to 15 N / mm.

5. The anti-shedding adhesive construction according to claim 1, wherein The groove structure is arranged in an interlaced array, a wave-shaped continuous distribution or a radial distribution, and the distance between adjacent grooves is 1-5 times the groove width.

6. The anti-shedding adhesive construction according to claim 1, wherein The first substrate (1) is metal, engineering plastic or fiber-reinforced composite material, and the surface is treated by sand blasting, chemical etching or laser engraving, and the surface roughness Ra is greater than or equal to 3.2 mu m. The adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, and the Shore hardness after solidification is D50-D90, and the peeling strength with the first substrate (1) is greater than or equal to 15 N / mm. The groove structure is arranged in an interlaced array, a wave-shaped continuous distribution or a radial distribution, and the distance between adjacent grooves is 1-5 times the groove width. The first substrate (1) is metal, engineering plastic or fiber-reinforced composite material, and the surface is treated by sand blasting, chemical etching or laser engraving, and the surface roughness Ra is greater than or equal to 3.2 mu m. The adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, and the Shore hardness after solidification is D50-D90, and the peeling strength with the first substrate (1) is greater than or equal to 15 N / mm. The groove structure is arranged in an interlaced array, a wave-shaped continuous distribution or a radial distribution, and the distance between adjacent grooves is 1-5 times the groove width. The first substrate (1) is metal, engineering plastic or fiber-reinforced composite material, and the surface is treated by sand blasting, chemical etching or laser engraving, and the surface roughness Ra is greater than or equal to 3.2 mu m. The adhesive layer is an epoxy resin, polyurethane or acrylate adhesive, and the Shore hardness after solidification is D50-D90, and the pe

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