Double-sided adhesive tape

Abstract

The utility model relates to a double-sided adhesive tape, which comprises a base material layer (2) and adhesive layers, and is characterized in that the adhesive layers with different bonding characteristics are arranged on two sides of the double-sided adhesive tape, a thermal reaction adhesive layer (1) is arranged on one side of the base material layer (2), and a pressure-sensitive adhesive layer (3) is arranged on the other side of the base material layer (2). The thermal reaction adhesive layer (1) is made of polyurethane adhesive containing a latent curing agent, and the latent curing agent is isocyanate and can be subjected to curing reaction at the temperature of 100 DEG C or below; and the pressure-sensitive adhesive layer (3) is made of an acrylic acid pressure-sensitive adhesive or a rubber pressure-sensitive adhesive. Wherein the thermal reactive adhesive is a polyurethane adhesive containing a latent curing agent, and the release protective layer adopts PEK release paper and a PET (Polyethylene Terephthalate) or PP (Propene Polymer) release film. The adhesive tape provided by the utility model is simple in structure, stable and reliable to use, good in waterproof and dustproof performance, low in reaction temperature of the thermal reaction adhesive layer, short in curing time, high in production efficiency, high in bonding strength, excellent in aging resistance and high in bonding strength, and is particularly suitable for materials difficult to bond, so that the product assembly quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of adhesive tape, especially relates to a double -sided adhesive tape of two surface coating different adhesive characteristics glue. BACKGROUND

[0002] In modern society, cars and electronic products have become necessities in people's lives, and the automobile parts and electronic product components need to be sealed and bonded, for example, the bonding of the car window sealing strip, the bonding of one side of these places needs to bond the sealing strip, and the other side needs to bond the car body, and the requirements for the adhesive tape are not only to improve the bonding and sealing effect, but also to improve the weather resistance. For example, the bonding of the internal components of the rearview mirror also requires special double-sided bonding performance. For example, when assembling the mobile phone back cover, the back cover and the mainboard and the mobile phone frame of the mobile phone need to form good sealing performance, effectively preventing dust, water and chemicals.

[0003] Due to the increasing demand for waterproofness and aging performance of existing electronic products, ordinary pressure-sensitive adhesive tape bonding failure modes after rigorous aging experiments are mainly from the mobile phone middle frame. When using double-sided pressure-sensitive adhesive tape bonding materials, some materials that are difficult to bond are encountered, such as some low-surface-energy materials, such as EPDM and other materials. Even if the surface is treated, it is difficult to ensure stable and effective bonding. In addition, after using pressure-sensitive adhesive tape to bond these materials, some harsh aging experiments need to be performed, such as high temperature and high humidity, water boiling, etc. The current pressure-sensitive adhesive tape is difficult to pass these tests. This makes the pressure-sensitive adhesive tape have limitations in some applications. INVENTION CONTENTS

[0004] Currently, the commonly used double-sided pressure-sensitive adhesive tape needs to be coated with a pre-coating agent on the surface when bonding some plastic and rubber components to improve the bonding strength of the pressure-sensitive adhesive to the components. The pre-coating agent has a high odor and a large amount of solvent volatilization, which affects the environment. The existing double-sided adhesive tape in the prior art has a high thermal reaction temperature, generally above 120 DEG C, a long curing time, and is inconvenient to operate, low in efficiency, poor in effect, and needs to be pasted before use, which is time-consuming and laborious. Such a high thermal reaction temperature not only affects the assembly efficiency, but also limits the bonded materials. If the bonded materials have poor temperature resistance, this adhesive tape cannot be used.

[0005] Therefore, the utility model aims at overcoming the defects in the prior art, and a double-sided adhesive tape coated with different adhesives on both sides is developed through the painstaking research and development of the inventor. In the double-sided adhesive tape, pressure-sensitive adhesive is arranged on one side of the base material, and thermal reaction adhesive is arranged on the other side, and the reaction temperature of the thermal reaction adhesive is low and the curing time is short.

[0006] That is, the utility model provides a double-sided adhesive tape made by coating different adhesives on both sides.

[0007] Specifically, the technical method of the utility model is as follows:

[0008] A double-sided adhesive tape, comprising a substrate layer 2 and an adhesive layer, characterized in that the double-sided adhesive tape is provided with adhesive layers with different adhesive properties on two sides, wherein a heat-reactive adhesive layer 1 is arranged on one side of the substrate layer 2, and a pressure-sensitive adhesive layer 3 is arranged on the other side of the substrate layer 2, the heat-reactive adhesive layer 1 is made of polyurethane adhesive containing a latent curing agent; and the pressure-sensitive adhesive layer 3 is made of acrylic pressure-sensitive adhesive or rubber pressure-sensitive adhesive.

[0009] Preferably, according to the double-sided adhesive tape, characterized in that the latent curing agent is a latent curing agent that can be cured below 100 DEG C; preferably the latent curing agent is isocyanate, and the thickness of the heat-reactive adhesive layer is in the range of 0.02mm-0.1mm.

[0010] More preferably, according to the double-sided adhesive tape, characterized in that the thickness of the pressure-sensitive adhesive layer 3 is 0.01mm-0.1mm.

[0011] Still more preferably, according to the double-sided adhesive tape, characterized in that the substrate layer 2 is made of PET film, PVC film, PE foam or PU foam.

[0012] Still more preferably, according to the double-sided adhesive tape, characterized in that the thickness of the PET film or PVC is 0.006mm-0.3mm, and the thickness of the foam is 0.05mm-3mm.

[0013] Still more preferably, according to the double-sided adhesive tape, characterized in that the density of the foam is 50kg / m 3 -800kg / m 3 .

[0014] Still more preferably, according to the double-sided adhesive tape, characterized in that the double-sided adhesive tape further comprises a release protective layer 4 covering the pressure-sensitive adhesive layer 3.

[0015] Preferably, the thickness of the release protective layer is in the range of 0.05mm-0.15mm.

[0016] Still more preferably, according to the double-sided adhesive tape, characterized in that the release protective layer 4 is made of PEK release paper, PET release film or PP release film.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The double-sided adhesive tape has simple structure, stable and reliable use, good waterproof and dustproof performance, low reaction temperature of the hot reaction adhesive layer, short curing time, high production efficiency, high bonding strength and excellent aging resistance, and thus ensures the quality of product assembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Figure 1 is a structural schematic view of a double-sided adhesive tape according to the present application;

[0020] Figure 2 Figure 2 is a structural schematic view of a double-sided adhesive tape according to Embodiment 2 of the present application.

[0021] 1-hot reaction adhesive layer; 2-substrate layer; 3-pressure sensitive adhesive layer; 4-release protection layer. DETAILED DESCRIPTION

[0022] The double-sided adhesive tape according to the present application is provided with a pressure sensitive adhesive layer on one side of a substrate layer, a hot reaction adhesive layer on the other side of the substrate layer, and a release protection layer on the pressure sensitive adhesive layer. The pressure sensitive adhesive layer can be any pressure sensitive adhesive, preferably acrylic pressure sensitive adhesive or rubber pressure sensitive adhesive. The substrate layer can be any commonly used substrate layer in the art, preferably PET film, PVC film, PE foam or PU foam. If PET film or PVC film is used, the thickness of the film is preferably 0.006mm-0.3mm. If PE foam or PU foam is used, the thickness of the foam is preferably 0.05mm-3mm, and the density is preferably 50kg / m 3 800kg / m 3 The release protection layer can be any material commonly used in the art, preferably PEK release paper, PET release film or PP release film, and has no limitation on the thickness as long as it can play a role of release protection. In order to solve the technical problems to be solved by the present application, the hot reaction adhesive layer must use polyurethane adhesive containing latent curing agent. Latent curing agent is also known as latent curing agent. In the present application, latent curing agent that can perform curing reaction below 100℃ is used, so that the polyurethane adhesive can be cured below 100℃. Preferably, isocyanate latent curing agent is used, because this latent curing agent not only enables the polyurethane adhesive to be cured below 100℃, but also has short curing time and can complete curing within 5 seconds.

[0023] The best embodiment of the present application will be described in detail below with reference to the accompanying drawings and examples.

[0024] Example 1

[0025] A double-sided adhesive tape is made by coating different adhesive properties on both sides, such as Figure 1As shown, it comprises a substrate layer 2 and a glue layer, characterized in that the double-sided adhesive tape is provided with glue layers with different bonding properties on both sides, wherein a heat-reactive glue layer 1 is arranged on one side of the substrate layer 2, and a pressure-sensitive adhesive layer 3 is arranged on the other side of the substrate layer 2, the heat-reactive glue layer 1 is made of polyurethane glue containing a latent curing agent; and the pressure-sensitive adhesive layer 3 is made of acrylic pressure-sensitive glue or rubber pressure-sensitive glue.

[0026] In a specific embodiment, as shown, specifically, the double-sided adhesive tape of the utility model comprises a heat-reactive glue layer 1, a substrate layer 2, a pressure-sensitive adhesive layer 3, and a release protective layer 4 covering the pressure-sensitive adhesive layer 3. Figure 1 When the adhesive tape is prepared, the pressure-sensitive adhesive layer 3 is formed by applying the pressure-sensitive adhesive glue with a precise thickness on the release protective layer 4, and then the substrate layer 2 treated by corona is laminated after drying in a drying oven, and the semi-finished product is prepared by rewinding. The polyurethane heat-reactive glue containing a latent curing agent is applied on the other side of the semi-finished product, and the finished product is prepared by rewinding after drying in a drying oven.

[0027] Preferably, the latent curing agent is a latent curing agent capable of curing reaction below 100 DEG C, and more preferably, the heat-reactive glue layer 1 is made of PU glue containing an isocyanate latent curing agent, the PU glue has good bonding force and weather resistance, and the latent curing agent has a curing temperature less than 100 DEG C, so as to reduce the reaction temperature and curing time. Preferably, the thickness of the heat-reactive glue layer is in the range of 0.02 mm to 0.1 mm, and too thick results in high cost, and too thin results in poor bonding.

[0028] In a specific embodiment, the substrate layer 2 is preferably made of PET film, and the thickness of the film is in the range of 0.006 mm to 0.3 mm. The PET film has high strength, stable size, thin thickness, and insulation performance, and can produce very thin adhesive tape, which is suitable for the design and assembly of ultra-thin products, especially for the assembly of electronic products. The heat-reactive glue film can further improve the bonding strength of the adhesive tape on difficult-to-stick surfaces, and increase the water vapor resistance, aging resistance, chemical resistance and other properties of the whole assembly.

[0029] In a specific embodiment, the pressure-sensitive adhesive layer 3 is preferably made of acrylic pressure-sensitive glue or rubber pressure-sensitive glue, and more preferably, the pressure-sensitive adhesive layer 3 is made of oil-based waterproof glue. It should be noted that the thickness of the pressure-sensitive adhesive layer 3 is preferably in the range of 0.01 mm to 0.1 mm, which can meet the requirements of different bonding properties in the assembly process, such as repeated positioning between some assemblies.

[0030] In a specific embodiment, the release protective layer 4 preferably adopts PEK release paper, PET release film or PP release film. Preferably, the thickness of the release protective layer is in the range of 0.05mm-0.15mm, too thick resulting in high cost, too thin failing to protect the pressure-sensitive adhesive.

[0031] Example 2

[0032] The same as Example 1 except that the substrate layer 2 adopts foam, and the specific structure is shown in Figure 2 The substrate layer 2 is made of, for example, PE foam or PU foam, and the thickness of the substrate layer 2 is in the range of 0.05mm-3mm, and the density is 50kg / m 3 800kg / m 3 The foam with the density and thickness has appropriate resilience, not too hard nor too soft, and can be extruded to fill the gap between the components to achieve waterproof and sealing. The packaging operation is simple and fast, and the cost is low.

[0033] A large number of experiments and actual application conditions prove that the foam layer thickness controlled in the range of 0.05-3mm is the most reasonable, and the foam with the thickness and density can ensure the dimensional stability of the adhesive tape in the production process and is easy to die-cut. The foam has excellent compression and resilience performance, and can fully fill the gap between the components, so the waterproof and dustproof effect is better.

[0034] If the thickness of the foam layer is less than 0.05mm, the actual compression amount is very small, and it is difficult to achieve the extrusion of the adhesive layer and the panel by means of the compression performance of the foam, so it is difficult to achieve the best sealing effect by the extrusion force and the adhesion. If the thickness of the foam is greater than 3mm, it will affect the appearance of the product, and the thicker foam layer has a larger compression amount, which also causes adverse effects on the stability of the components.

[0035] It should be noted that the thickness of the foam layer as the substrate should be in a continuous preferred value range, so that the thickness of the foam layer can be selected according to actual needs to adapt to the sealing between various structural components. In fact, even under the same product, the thickness of the foam layer may need to be selected within a certain range, because the foam layer has a certain compression, and the small processing error of the foam layer actually does not affect the sealing performance during packaging.

[0036] The double-sided adhesive tape is especially suitable for sealing and bonding between automobile parts and electronic product components, for example, bonding of a window sealing strip, bonding of the sealing strip by the hot reaction adhesive surface of the adhesive tape, and bonding of the vehicle body by the other surface, so that the bonding and sealing effects and weather resistance can be improved. The double-sided adhesive tape can also be used for bonding of internal components of a rearview mirror. During assembly of a mobile phone rear shell, good sealing is required between the rear shell and the main board and the frame of the mobile phone, and effective dustproof, waterproof and chemical resistance are required. As the demand for waterproofness and aging performance of existing electronic products is increasingly high, after rigorous aging experiments, the main failure mode of ordinary pressure-sensitive adhesive tape is that the mobile phone frame is separated. Currently, double-sided pressure-sensitive adhesive tape is usually used, and when some plastic and rubber components are bonded, a pre-coating agent needs to be coated on the surface to improve the bonding strength of the pressure-sensitive adhesive to the components. The pre-coating agent has high odor and high solvent volatilization, which affects the environment. The adhesive tape existing on the market has a high hot reaction temperature, generally above 120 DEG C. On the one hand, the high-temperature reaction affects the assembly efficiency, and on the other hand, the bonded material is also limited. If the bonded material has poor temperature resistance, this method cannot be used. In the utility model, different adhesive layers with different bonding properties are used on the two surfaces. The reaction temperature of the hot reaction adhesive layer is lower than 100 DEG C, and the reaction time is less than 3 seconds. Through the reaction of the hot reaction adhesive film, the physical bonding and chemical bonding are matched, and the bonding strength of the adhesive tape to the plastic and rubber components is further improved, and the waterproofness and chemical resistance are improved.

[0037] When the adhesive tape is used, according to the gap between the components and the requirements for the material, the adhesive tape with corresponding thickness and material is selected, the adhesive tape is die cut into the required size in the drawing, the hot reaction adhesive surface is bonded to the components (components not easy to bond) by using a hot press, the release paper is torn off, the pressure-sensitive adhesive surface is bonded to the surface of the vehicle body or the shell, and complete bonding assembly is formed, so that the waterproofness and dustproofness of both sides are achieved.

[0038] The double-sided adhesive tape structure is simple, stable and reliable in use, has low reaction temperature, high bonding strength, good waterproofness, chemical resistance and dustproofness, and ensures the quality of product assembly.

[0039] The above embodiments are only the best implementation manners of the utility model, and do not limit the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0040] The above is the specific implementation manner of the utility model, and various changes and replacements can be made to the utility model without departing from the spirit and principle of the utility model. The changes and replacements are within the protection scope of the utility model.

Claims

1. Double-sided adhesive tape comprising a substrate layer (2) and an adhesive layer, characterized in that, The double-sided adhesive tape is provided with adhesive layers with different adhesive properties on two sides, wherein a heat reaction adhesive layer (1) is arranged on one side of the substrate layer (2), and a pressure sensitive adhesive layer (3) is arranged on the other side of the substrate layer (2), the heat reaction adhesive layer (1) is made of polyurethane adhesive containing latent curing agent; the pressure sensitive adhesive layer (3) is made of acrylic pressure sensitive adhesive or rubber pressure sensitive adhesive.

2. The double-sided tape according to claim 1, wherein The latent curing agent is a latent curing agent capable of curing below 100 DEG C.

3. The double-sided tape of claim 1, wherein The latent curing agent is isocyanate, and the thickness of the heat reaction adhesive layer is in the range of 0.02mm-0.1mm.

4. The double-sided tape of claim 1, wherein The thickness of the pressure sensitive adhesive layer (3) is 0.01mm-0.1mm.

5. The double-sided tape according to any one of claims 1 to 4, wherein The substrate layer (2) is made of PET film, PVC film, PE foam or PU foam.

6. The double-sided tape of claim 5, wherein The thickness of the PET film or PVC is 0.006mm-0.3mm, and the thickness of the foam is 0.05mm-3mm.

7. The double-sided tape of claim 5, wherein The density of the foam is 50 kg / m 3 - 800 kg / m 3 .

8. The double-sided tape according to any one of claims 1 to 4, wherein The double-sided adhesive tape further comprises a release protective layer (4) covering the pressure sensitive adhesive layer (3).

9. The double-sided tape of claim 8, wherein, The thickness of the release protective layer is in the range of 0.05mm-0.15mm.

10. The double-sided tape of claim 8, wherein, The release protective layer (4) is made of PEK release paper, PET release film or PP release film.

Images