A composite adhesive

Abstract

This utility model discloses a composite adhesive backing, specifically relating to the field of adhesive backing technology. It includes a substrate layer, a wear-resistant layer on top of the substrate layer, a composite adhesive at the bottom of the substrate layer, a release film at the bottom of the composite adhesive, and protrusions and grooves on both the upper and lower sides of the substrate layer. This utility model firstly uses the protrusions and grooves to create a "physical interlocking" between the substrate layer, the wear-resistant layer, and the composite adhesive, increasing the contact area and interfacial adhesion, and enhancing the bonding strength between the substrate layer, the wear-resistant layer, and the composite adhesive. This prevents delamination between the substrate layer and the wear-resistant layer and the composite adhesive. Furthermore, the corresponding design of the upper and lower grooves and protrusions on the substrate layer ensures uniform stress distribution on the upper and lower surfaces of the substrate layer, preventing curling of the adhesive due to stress concentration on one side, ensuring flatness after bonding, and protecting the surface of the adhesive backing.

Description

Technical Field

[0001] This utility model relates to the field of adhesive technology, and more specifically, to a composite adhesive. Background Technology

[0002] In modern industrial production and daily life, adhesive backing serves as the core medium for connecting different materials. Its performance directly determines the assembly quality and service life of products. In the process of electronic product manufacturing, before electronic components, integrated circuit boards and various silicon wafers are assembled into a system circuit board, in order to protect the internal structure from oxidation or bending due to external force, adhesive backing is applied to their surfaces for protection or to facilitate bonding and fixing. Chinese patent application CN201820838443.1 discloses a PEVA adhesive backing, comprising a printing layer, a PEVA film, a pressure-sensitive adhesive layer, and a release layer. The lower surface of the printing layer is bonded to the upper surface of the PEVA film, the lower surface of the PEVA film is bonded to the upper surface of the pressure-sensitive adhesive layer, and the lower surface of the pressure-sensitive adhesive layer is bonded to the upper surface of the release layer. This PEVA adhesive backing is biodegradable, free of heavy metals and odor, and poses no risk of plasticizer leaching, making it an excellent environmentally friendly material. Different printing layers can be coated on the PEVA film to obtain consumables suitable for different inks. Traditional adhesives often use a simple structure of "substrate + single adhesive". The substrate, adhesive and protective layer are bonded only by surface coating, without physical interlocking structure. When used for a long time or when temperature changes occur, interlayer peeling is likely to occur, resulting in weak bonding and failure of the adhesive function. Therefore, a composite adhesive is proposed. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a composite adhesive to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a composite adhesive, comprising a substrate layer, a wear-resistant layer on the top of the substrate layer to protect the surface of the adhesive and effectively resist friction and impact; a composite adhesive at the bottom of the substrate layer, with a release film at the bottom of the composite adhesive to protect the composite adhesive and facilitate peeling; the release film isolates the composite adhesive from dust and moisture, ensuring that the adhesive does not harden or stick during storage and maintains its initial bonding performance; and protrusions and grooves on both the upper and lower sides of the substrate layer to increase the bonding strength between the substrate layer, the wear-resistant layer, and the composite adhesive, forming a physical interlock between them, improving adhesion, and preventing delamination.

[0005] Preferably, the substrate layer is made of PET film, and the thickness of the substrate layer is set to 20-50μm. PET film has excellent tensile strength and elongation at break. The thickness of 20-50μm can ensure that the adhesive is not easily torn during bonding and use, and avoid damage to the adhesive caused by external force pulling.

[0006] Preferably, the bump is configured as a rectangular structure, the height of the bump is set to 5-15μm, the diameter or side length of the bump is 20-50μm, and the distance between two adjacent bumps is set to 20-50μm.

[0007] Preferably, the protrusions and grooves are alternately arranged, with the top protrusion of the substrate layer corresponding to the bottom groove of the substrate layer, and the top groove of the substrate layer corresponding to the bottom protrusion of the substrate layer. The alternating layout of rectangular protrusions and grooves can form a "physical interlock" between the substrate layer, the wear-resistant layer, and the composite colloid, increasing the contact area and interfacial adhesion, and avoiding delamination. Furthermore, the corresponding design of the upper and lower grooves and protrusions of the substrate layer can ensure uniform stress distribution on the upper and lower surfaces of the substrate layer, preventing the adhesive from curling due to stress concentration on one side, and ensuring flatness after bonding.

[0008] Preferably, the wear-resistant layer is made of polyurethane resin or polyimide resin, and the thickness of the wear-resistant layer is set to 5-15μm. Part of the wear-resistant layer fills the middle of the top groove of the substrate layer. The high hardness and low wear characteristics of polyurethane / polyimide resin can effectively resist friction and collision. Moreover, through the cooperation of the wear-resistant layer and the groove, an "interlocking structure" can be formed. Combined with the chemical bonding between the resin itself and the PET substrate, "physical + chemical" dual fixation is achieved, solving the problem of easy peeling of traditional wear-resistant layers.

[0009] Preferably, the composite colloid is epoxy resin.

[0010] Preferably, the thickness of the composite colloid is set to 15-40 μm, and part of the composite colloid fills the middle of the bottom groove of the substrate layer. The epoxy resin provides excellent chemical adhesion and is suitable for polar materials such as metals and plastics. The tackifier (such as terpene resin) enhances the adhesion to non-polar materials such as fabrics. Through the cooperation between the composite colloid and the groove, the bonding strength between the composite colloid and the substrate layer can be improved.

[0011] Preferably, the release film is made of PET release film material, and the thickness of the release film is set to 10-30μm. The PET release film can isolate dust and moisture from contact with the composite adhesive, ensuring that the adhesive does not solidify or stick during storage and maintains its initial bonding performance.

[0012] The technical effects and advantages of this utility model are as follows: 1. This utility model firstly uses protrusions and grooves to form a "physical interlock" between the substrate layer, wear-resistant layer, and composite colloid, thereby increasing the contact area and interfacial adhesion, increasing the bonding strength between the substrate layer, wear-resistant layer, and composite colloid, and preventing delamination between the substrate layer, wear-resistant layer, and composite colloid. Furthermore, the corresponding design of the upper and lower grooves and protrusions of the substrate layer can ensure uniform stress distribution on the upper and lower surfaces of the substrate layer, preventing the adhesive from curling due to stress concentration on one side, and ensuring flatness after bonding. 2. This utility model also protects the surface of the adhesive through a wear-resistant layer, which can effectively resist friction and collision. The release film protects the composite adhesive and is easy to peel off and use. It can isolate dust and moisture from contact with the composite adhesive, ensuring that the adhesive does not solidify or stick during storage and maintains its initial bonding performance. The substrate layer is made of PET film material, which ensures that the adhesive is not easily torn during bonding and use, avoiding damage to the adhesive caused by external pulling. Through the cooperation of the wear-resistant layer and the groove, an "interlocking structure" can be formed. Combined with the chemical bonding between the resin itself and the PET substrate, a "physical + chemical" dual fixation is achieved, solving the problem of easy peeling of traditional wear-resistant layers. In summary, through the interaction of the above-mentioned multiple effects, a "physical interlocking" can be formed between the layers, increasing the contact area and interfacial adhesion, avoiding delamination, and protecting the surface of the adhesive. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the layered structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the substrate layer of this utility model.

[0016] The attached diagram is labeled as follows: 1. Substrate layer; 2. Wear-resistant layer; 3. Composite colloid; 4. Release film; 5. Protrusion; 6. Groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] As attached Figure 1-3The composite adhesive shown includes a substrate layer 1, a wear-resistant layer 2 on top of the substrate layer 1 to protect the surface of the adhesive and effectively resist friction and impact. A composite adhesive 3 is disposed at the bottom of the substrate layer 1, and a release film 4 is disposed at the bottom of the composite adhesive 3. The release film 4 protects the composite adhesive 3 and facilitates peeling and use, and can prevent dust and moisture from contacting the composite adhesive, ensuring that the adhesive does not harden or stick during storage and maintains its initial bonding performance. Protrusions 5 and grooves 6 are provided on both the upper and lower sides of the substrate layer 1. The protrusions 5 and grooves 6 can increase the bonding strength between the substrate layer 1, the wear-resistant layer 2, and the composite adhesive 3, so that the substrate layer 1, the wear-resistant layer 2, and the composite adhesive 3 form a physical interlock, improve adhesion, and avoid delamination.

[0019] As attached Figure 1-3 As shown, the substrate layer 1 is made of PET film, with a thickness of 20-50 μm. The bumps 5 are rectangular, with a height of 5-15 μm and a diameter or side length of 20-50 μm. The distance between two adjacent bumps 5 is 20-50 μm. The bumps 5 and grooves 6 are alternately arranged. The top bumps 5 of the substrate layer 1 correspond to the bottom grooves 6 of the substrate layer 1, and the top grooves 6 of the substrate layer 1 correspond to the bottom bumps 5 of the substrate layer 1. The PET film has excellent tensile strength and breaking strength. The elongation at break and a thickness of 20-50μm ensure that the adhesive backing is not easily torn during bonding and use, preventing damage caused by external pulling. The alternating layout of rectangular protrusions 5 and grooves 6 allows for "physical interlocking" between the substrate layer 1, the wear-resistant layer 2, and the composite adhesive 3, increasing the contact area and interfacial adhesion, and preventing delamination. Furthermore, the corresponding design of the upper and lower grooves 6 and protrusions 5 on the substrate layer 1 ensures uniform stress distribution on the upper and lower surfaces of the substrate layer 1, preventing curling of the adhesive backing due to stress concentration on one side and ensuring flatness after bonding. As attached Figure 1-3As shown, the wear-resistant layer 2 is made of polyurethane resin or polyimide resin, and its thickness is 5-15μm. Part of the wear-resistant layer 2 fills the middle of the top groove 6 of the substrate layer 1. The composite colloid 3 is epoxy resin, which contains curing agent, tackifier, and weather-resistant additives, and is mixed in a weight ratio of (50-70):(10-15):(8-12):(3-5). The thickness of the composite colloid 3 is 15-40μm. Part of the composite colloid 3 fills the middle of the bottom groove 6 of the substrate layer 1. The release film 4 is made of PET release film, and its thickness is 10-30μm. The high hardness of polyurethane and polyimide resins... With its low abrasion characteristics, it can effectively resist friction and impact. Through the cooperation of the abrasion-resistant layer 2 and the groove 6, a "molded structure" can be formed. Combined with the chemical bonding between the resin itself and the PET substrate, a "physical + chemical" dual fixation is achieved, solving the problem of easy peeling of traditional abrasion-resistant layers. Epoxy resin provides excellent chemical bonding force and is suitable for polar materials such as metals and plastics. Tackifiers such as terpene resin enhance the adhesion to non-polar materials such as fabrics. Through the cooperation of composite colloid 3 and groove 6, the bonding strength between composite colloid 3 and substrate layer 1 can be improved. PET release film can isolate dust and moisture from contact with composite colloid, ensuring that the adhesive does not solidify or stick during storage and maintains its initial bonding performance.

[0020] The working principle of this utility model is as follows: During the manufacturing process, a thick composite PET film is selected, and protrusions 5 and grooves 6 are processed on the upper and lower surfaces through a precision molding process to ensure that the protrusions 5 and grooves 6 are alternately distributed and their upper and lower positions correspond to each other, thus forming the substrate layer 1. By applying polyurethane resin or polyimide resin to the top of the substrate layer 1 with a comma-shaped doctor blade, ensuring that the resin fills the top groove 6, a wear-resistant layer 2 is formed on the top of the substrate layer 1. After the wear-resistant layer 2 is cured and formed, the mixed and formed composite colloid 3 is coated on the bottom of the substrate layer 1 to ensure that the release film 4 fills the bottom groove 6 of the substrate layer 1 for initial curing. The release film is made by using a thick composite PET release film and bonding it to the bottom of the composite colloid using a laminating machine, ensuring that the release film and colloid are tightly bonded and free of air bubbles.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite adhesive backing, comprising a substrate layer (1), characterized in that: The substrate layer (1) has a wear-resistant layer (2) on top, a composite colloid (3) on bottom, a release film (4) on bottom, and protrusions (5) and grooves (6) on both the upper and lower sides.

2. The composite adhesive according to claim 1, characterized in that: The substrate layer (1) is a PET film, and the thickness of the substrate layer (1) is set to 20-50 μm.

3. The composite adhesive according to claim 1, characterized in that: The bump (5) is set as a rectangular structure, the height of the bump (5) is set as 5-15μm, the diameter or side length of the bump (5) is 20-50μm, and the distance between two adjacent bumps (5) is set as 20-50μm.

4. The composite adhesive according to claim 1, characterized in that: The protrusions (5) and grooves (6) are alternately arranged. The protrusions (5) on the top of the substrate layer (1) correspond to the grooves (6) on the bottom of the substrate layer (1), and the grooves (6) on the top of the substrate layer (1) correspond to the protrusions (5) on the bottom of the substrate layer (1).

5. The composite adhesive according to claim 1, characterized in that: The wear-resistant layer (2) is made of polyurethane resin, and the thickness of the wear-resistant layer (2) is set to 5-15μm. Part of the wear-resistant layer (2) is filled in the middle of the top groove (6) of the substrate layer (1).

6. The composite adhesive according to claim 1, characterized in that: The composite colloid (3) is epoxy resin.

7. The composite adhesive according to claim 1, characterized in that: The thickness of the composite colloid (3) is set to 15-40 μm, and part of the composite colloid (3) is filled in the middle of the bottom groove (6) of the substrate layer (1).

8. The composite adhesive according to claim 1, characterized in that: The release film (4) is a PET release film, and the thickness of the release film (4) is set to 10-30μm.

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