CN115044309B - Double-sided adhesive tape and manufacturing method thereof - Google Patents
Double-sided adhesive tape and manufacturing method thereof Download PDFInfo
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- CN115044309B CN115044309B CN202210719354.6A CN202210719354A CN115044309B CN 115044309 B CN115044309 B CN 115044309B CN 202210719354 A CN202210719354 A CN 202210719354A CN 115044309 B CN115044309 B CN 115044309B
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- 239000002390 adhesive tape Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000012790 adhesive layer Substances 0.000 claims abstract description 338
- 239000000853 adhesive Substances 0.000 claims abstract description 39
- 230000001070 adhesive effect Effects 0.000 claims abstract description 39
- 238000004132 cross linking Methods 0.000 claims abstract description 33
- 239000010410 layer Substances 0.000 claims description 81
- 239000003292 glue Substances 0.000 claims description 67
- 238000000034 method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000005452 bending Methods 0.000 description 22
- 239000000084 colloidal system Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
Abstract
The embodiment of the application provides a double-sided adhesive tape and a manufacturing method thereof, relates to the technical field of display, and aims to solve the technical problems that the inside of the double-sided adhesive tape is easy to damage and deform greatly after a display module is used for a long time or in a high-temperature environment. The double-sided tape is used for a display module and comprises a first adhesive layer, a second adhesive layer and an intermediate adhesive layer positioned between the first adhesive layer and the second adhesive layer, wherein the crosslinking degree of the intermediate adhesive layer is greater than that of the first adhesive layer and the second adhesive layer. The double-sided adhesive tape can ensure that the display part and the binding part have larger adhesive force on one hand, and avoid separation between the binding part and the display part; on the other hand, after long-time use or when the double-sided adhesive tape is used in a high-temperature environment, the inside of the double-sided adhesive tape can be prevented from being broken, and the deformation quantity of the double-sided adhesive tape can be reduced.
Description
Technical Field
The application relates to the technical field of display, in particular to a double-sided adhesive tape and a manufacturing method thereof.
Background
With the continuous development of display technology, increasing the screen ratio becomes a current development trend of display devices.
In the related art, a scheme of setting a driving chip on a display panel (COP) is generally adopted, that is, a binding portion connected with the driving chip in the display panel is bent to a backlight side of a display portion of the display panel, so as to reduce a frame width of a display module, thereby improving a screen occupation ratio of the display device. The binding portion is typically adhered to the backlight side of the display portion by a double-sided adhesive tape.
However, after the display module is used for a long time or in a high-temperature environment, the inside of the double-sided adhesive tape is easy to be damaged to break, so that the binding part is separated from the display part; or the double-sided tape can generate larger deformation, and the distance between the binding part and the display part is increased, so that the bending radius of the display module is increased, and the frame width of the display device is further increased.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a double-sided tape and a method for manufacturing the same, so as to solve the technical problems that the inside of the double-sided tape is easily damaged and deformed greatly after the display module is used for a long time or in a high temperature environment.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
an embodiment of the application provides a double-sided adhesive tape, which comprises a first adhesive layer, a second adhesive layer and an intermediate adhesive layer positioned between the first adhesive layer and the second adhesive layer, wherein the crosslinking degree of the intermediate adhesive layer is greater than that of the first adhesive layer and the second adhesive layer.
According to the double-sided adhesive tape, the first adhesive layer and the second adhesive layer are used for adhering the display part and the binding part of the display panel, the crosslinking degree of the middle adhesive layer between the first adhesive layer and the second adhesive layer is larger than that of the first adhesive layer and larger than that of the second adhesive layer, so that on one hand, the colloid for adhering the double-sided adhesive tape to the display part and the binding part has higher initial viscosity, the display part and the binding part can be ensured to have higher adhesive force, separation between the binding part and the display part is avoided, and the display function of the display module is ensured; on the other hand can make the colloid in the double-sided tape have higher and hold the viscidity, after long-time use or when using under high temperature environment, the inside fracture that can not take place of double-sided tape can guarantee to have higher bonding stability between display part and the binding part, and can reduce the deformation volume of double-sided tape, guarantees the distance between binding part and the display part to guarantee the radius of bending of display module assembly, and then reduce display module assembly's frame width.
In one possible implementation, the initial viscosity of the intermediate adhesive layer is less than the initial viscosity of the first and second adhesive layers;
Preferably, the materials of the first adhesive layer, the second adhesive layer and the intermediate adhesive layer all comprise acrylic resin.
In one possible implementation, the surface of the intermediate adhesive layer contacting the first adhesive layer is crosslinked with each other; and/or, the surfaces of the intermediate adhesive layer and the second adhesive layer, which are contacted with each other, are crosslinked with each other.
Preferably, the intermediate adhesive layer has a degree of polymerization greater than that of the first and second adhesive layers.
In one possible implementation manner, a shading film layer is arranged inside the middle glue layer;
Preferably, the material of the light shielding film layer comprises at least one of polyethylene, polyethylene terephthalate or polyimide;
Preferably, the light shielding film layer is a black film layer.
In one possible implementation manner, a plurality of first grooves are arranged at intervals on one side of the middle adhesive layer, which faces the first adhesive layer; a plurality of first bulges are arranged on one side, facing the middle adhesive layer, of the first adhesive layer, the first bulges and the first grooves are arranged in a one-to-one correspondence manner, and each first bulge is embedded into the corresponding first groove;
and/or a plurality of second grooves which are arranged at intervals are arranged on the surface of the middle adhesive layer facing the second adhesive layer; a plurality of second bulges are arranged on one side, facing the middle adhesive layer, of the second adhesive layer, the second bulges and the second grooves are arranged in a one-to-one correspondence manner, and each second bulge is embedded into the corresponding second groove;
preferably, the first grooves and the second grooves are spaced from each other and are staggered.
A second aspect of the embodiment of the present application provides a method for manufacturing a double-sided tape, including:
Providing an intermediate adhesive layer;
Forming a first adhesive layer on one side of the middle adhesive layer, wherein the crosslinking degree of the first adhesive layer is smaller than that of the middle adhesive layer;
And forming a second bonding layer on one side of the middle adhesive layer, which is opposite to the first bonding layer, wherein the crosslinking degree of the second bonding layer is smaller than that of the middle adhesive layer.
The manufacturing method of the double-sided tape according to the embodiment of the present application is used for manufacturing the double-sided tape, and the advantages of the double-sided tape can be referred to the above description, and the embodiments of the present application will not be repeated.
In one possible implementation, the providing an intermediate glue layer includes:
providing a first transparent bottom film, wherein one side surface of the first transparent bottom film is provided with a plurality of third bulges which are arranged at intervals;
Coating a first preset adhesive on the surface of one side of the first transparent bottom film with the third bulge;
Providing a second transparent bottom film opposite to the first transparent bottom film, wherein a side surface of the second transparent bottom film facing the first transparent bottom film is provided with a plurality of fourth bulges which are arranged at intervals;
Applying pressure to the first preset glue through the second transparent bottom film to form a plurality of first grooves sleeved on the third bulges on the surface of one side, facing the first transparent bottom film, of the first preset glue, and form a plurality of second grooves sleeved on the fourth bulges on the surface of one side, facing the second transparent bottom film, of the first preset glue;
And carrying out illumination on the first transparent bottom film and the second transparent bottom film, and curing the first preset glue to form an intermediate glue layer.
In one possible implementation manner, the manufacturing method further includes:
Providing a shading film layer;
The providing a light shielding film layer includes: after the first preset glue is coated on the side surface of the first transparent bottom film, which is provided with the third bulge, one side surface of the light shielding film layer is attached to the side surface, far away from the first transparent bottom film, of the first preset glue, and the first preset glue is continuously coated on the other side surface of the light shielding film layer.
In one possible implementation manner, the forming a first adhesive layer on one side of the intermediate adhesive layer includes:
coating a second preset adhesive on one side surface of the middle adhesive layer, and covering a first release film on the second preset adhesive;
And (3) irradiating the first release film, and curing the second preset adhesive to form the first adhesive layer, wherein the surfaces of the first adhesive layer and the intermediate adhesive layer, which are in contact, are mutually crosslinked.
In one possible implementation manner, the forming a second adhesive layer on a side of the intermediate adhesive layer facing away from the first adhesive layer includes:
coating a third preset adhesive on the surface of one side of the middle adhesive layer, which is opposite to the first adhesive layer; covering a second release film on the third preset adhesive;
and (3) irradiating the second release film, and curing the third preset adhesive to form the second adhesive layer, wherein the surfaces of the second adhesive layer and the middle adhesive layer, which are contacted, are mutually crosslinked.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a display module according to an embodiment of the application when the display module is unfolded;
FIG. 2 is a schematic diagram illustrating a structure of the display module of FIG. 1 when the display module is bent;
FIG. 3 is a schematic view of a double-sided tape according to an implementation of the embodiment of the present application shown in FIG. 2;
FIG. 4 is a schematic view of a double-sided tape according to another implementation of the embodiment of the present application shown in FIG. 2;
FIG. 5 is a schematic view of a double-sided tape according to another implementation of the embodiment of the present application shown in FIG. 2;
FIG. 6 is a schematic flow chart of a method for manufacturing a double-sided tape according to an embodiment of the application;
FIG. 7 is a schematic view of a first pre-determined glue applied to a first transparent carrier film;
FIG. 8 is a schematic view of the first preset glue forming a light shielding film and continuing to apply the first preset glue;
FIG. 9 is a schematic view of a first pre-determined adhesive covered with a second transparent carrier film;
FIG. 10 is a schematic diagram of removing the second transparent base film and forming a third preset adhesive and a second release film on a side of the second sub-adhesive layer facing away from the light shielding film layer;
FIG. 11 is a schematic illustration of the illumination of a second release film;
FIG. 12 is a schematic view of removing the first transparent base film and forming a second preset adhesive and a first release film on a side of the first sub-adhesive layer facing away from the light shielding film layer;
FIG. 13 is a schematic illustration of the illumination of the first release film;
Fig. 14 is a schematic view of a double-sided tape using an embodiment of the present application.
Reference numerals illustrate:
10. A display unit;
20. A binding portion;
210. a driving circuit board;
30. A bending part;
40. double-sided tape;
410. A first adhesive layer; 411. A first protrusion;
412. a second preset glue; 420. A second adhesive layer;
421. a second protrusion; 422. A third preset glue;
430. an intermediate adhesive layer; 431. A first sub-adhesive layer;
432. a first groove; 433. A light shielding film layer;
434. a second sub-adhesive layer; 435. A second groove;
436. A first preset glue; 440. A first transparent base film;
441. A third protrusion; 450. A second transparent base film;
451. A fourth protrusion; 460. A first release film;
470. a second release film;
50. and a cover plate.
Detailed Description
In the related art, the technical problem that the inside of the double-sided adhesive tape is easy to be damaged or to generate larger deformation after the display module is used for a long time or in a high-temperature environment is solved. The inventor has long studied and found that the main generation reason is that the display panel comprises a display part, a bending part and a binding part, wherein the binding part is positioned on the backlight side of the display part and is adhered to the backlight side of the display part through a double-sided adhesive tape. The bending part is a bending area, one end of the bending part is connected with the display part, and the other end of the bending part is connected with the binding part. In order to reduce the frame width of the display module as much as possible, the bending radius of the bending portion is generally smaller. However, the smaller the bending radius of the bending portion is, the larger the rebound force of the bending portion is, so that the force for separating the binding portion and the display portion from each other is larger.
To prevent the binding portion and the display portion from being separated from each other, it is necessary to improve the initial tackiness of the double-sided tape. However, the double-sided adhesive tape with higher initial adhesion has low elastic modulus, softer colloid and high fluidity, namely, the double-sided adhesive tape has low holding viscosity. After a long time or in a high-temperature environment, the inside of the double-sided adhesive tape is easy to damage, so that the binding part is separated from the display part, and the display function of the display module is affected; or the double-sided tape can generate larger deformation, so that the distance between the binding part and the display part is increased, the bending radius of the display module is increased, and the frame width of the display module is further increased.
In view of the above technical problems, in the double-sided tape according to the embodiment of the present application, the degree of crosslinking of the adhesive layer located between the first adhesive layer and the second adhesive layer is greater than the degree of crosslinking of the first adhesive layer and greater than the degree of crosslinking of the second adhesive layer. On one hand, the colloid for bonding the double-sided adhesive tape with the display part and the binding part has higher initial viscosity, so that the display part and the binding part can be ensured to have larger bonding force, and separation between the binding part and the display part is avoided, thereby ensuring the display function of the display module; on the other hand can make the colloid in the double-sided tape have higher and hold the viscidity, after long-time use or when using under high temperature environment, can not take place the fracture in the double-sided tape, can guarantee to have higher bonding stability between display part and the binding part, and can reduce the deformation volume of double-sided tape, guarantee the distance between binding part and the display part to guarantee the radius of bending of display module assembly, and then reduce display module assembly's frame width.
In order to make the above objects, features and advantages of the embodiments of the present application more comprehensible, the technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that the dimensions and shapes of the figures in the drawings do not reflect true proportions, and are intended to illustrate only the embodiments of the present application. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.
Referring to fig. 1, an embodiment of the present application provides a display module, which includes a display panel and a double-sided tape 40, wherein the display panel includes a display portion 10, a binding portion 20, and a bending portion 30. The display unit 10 has a display function and includes a light emitting side and a backlight side opposite to the light emitting side. The light emitting side may be bonded with a cover plate 50, and the cover plate 50 can protect the display portion 10. The binding part 20 is used to connect the driving circuit board 210. The binding portion 20 is located on the backlight side of the display portion 10, and is adhered to the backlight side of the display portion 10 by the double-sided adhesive tape 40. Referring to fig. 2, the bending portion 30 has bending performance. One end of the bending portion 30 is connected to the binding portion 20, and the other end of the bending portion 30 is connected to the display portion 10. When the bending portion 30 is bent, the binding portion 20 is bent to the backlight side of the display portion 10. Since the binding portion 20 is located at the backlight side of the display portion 10, the space occupied by the binding portion 20 is reduced, so that the frame width of the display module is reduced, and the screen occupation ratio of the display device provided with the display module is improved.
The binding portion 20 is adhered to the backlight side of the display portion 10 by a double-sided adhesive tape 40. Illustratively, referring to fig. 3, the double-sided tape 40 includes a first adhesive layer 410, a second adhesive layer 420, and an intermediate adhesive layer 430 positioned between the first adhesive layer 410 and the second adhesive layer 420, the intermediate adhesive layer 430 having a degree of crosslinking greater than the first adhesive layer 410 and the second adhesive layer 420.
The double-sided tape 40 according to the embodiment of the present application, the first adhesive layer 410 and the second adhesive layer 420 are used to adhere the display portion 10 and the binding portion 20 of the display panel. The first adhesive layer 410 and the second adhesive layer 420 have high initial tackiness. Because the first adhesive layer 410 and the second adhesive layer 420 have higher initial adhesion, when the display portion 10 and the binding portion 20 are adhered, the first adhesive layer 410 and the second adhesive layer 420 can fully infiltrate the display portion 10 and the binding portion 20 in a short time, so that a larger adhesive force between the display portion 10 and the binding portion 20 can be ensured, separation between the binding portion 20 and the display portion 10 is avoided, and reliability of the display module is ensured.
The degree of crosslinking of the intermediate adhesive layer 430 between the first adhesive layer 410 and the second adhesive layer 420 is greater than that of the first adhesive layer 410 and greater than that of the second adhesive layer 420, so that the adhesive in the double-sided tape 40 has higher holding viscosity, and the inside of the double-sided tape 40 is not broken after long-time use or use in a high-temperature environment, and higher adhesive stability between the display part 10 and the binding part 20 can be ensured; and the deformation of the double-sided tape 40 can be reduced, the distance between the binding part 20 and the display part 10 is ensured, so that the bending radius of the display panel is ensured, and the frame width of the display module is further reduced.
Illustratively, the materials of the first adhesive layer 410, the second adhesive layer 420, and the intermediate adhesive layer 430 may each include an acrylic resin. The degree of crosslinking can be adjusted by adjusting parameters such as the degree of polymerization of the material. Illustratively, the intermediate adhesive layer 430 has a degree of polymerization greater than that of the first adhesive layer 410 and greater than that of the second adhesive layer 420, such that the intermediate adhesive layer 430 has a degree of crosslinking greater than that of the first adhesive layer 410 and the second adhesive layer 420.
Illustratively, the surfaces of the intermediate adhesive layer 430 that contact the first adhesive layer 410 may be cross-linked to each other, and/or the surfaces of the intermediate adhesive layer 430 that contact the second adhesive layer 420 may be cross-linked to each other. By this arrangement, the connection strength between the intermediate adhesive layer 430 and the first adhesive layer 410 and the connection strength between the intermediate adhesive layer 430 and the second adhesive layer 420 can be improved, and the intermediate adhesive layer 430 and the first adhesive layer 410 and the second adhesive layer 420 can be prevented from being separated from each other.
It should be noted that, the cross-linking means that the carbon-carbon double bonds between the intermediate adhesive layer 430 and the first adhesive layer 410 and/or between the intermediate adhesive layer 430 and the second adhesive layer 420 are opened under the action of the photoinitiator, so as to form a new chemical bond connection, and form a mesh-shaped interweaving structure, and the structure can enable the intermediate adhesive layer 430 and the first adhesive layer 410 and/or the second adhesive layer 420 to be integrated at the contact position, so that the connection strength between the intermediate adhesive layer 430 and the first adhesive layer 410 and/or the connection strength between the intermediate adhesive layer 430 and the second adhesive layer 420 are improved.
It will be appreciated that referring to fig. 3, the intermediate glue layer 430 may comprise a glue layer. Referring to fig. 4, the intermediate adhesive layer 430 may also include a plurality of adhesive layers, each of which has a degree of crosslinking greater than that of the first adhesive layer 410 and greater than that of the second adhesive layer 420. That is, the number of the adhesive layers in the intermediate adhesive layer 430 is not particularly limited in the embodiment of the present application. The scheme of the embodiment of the present application will be described below by taking an example in which the intermediate adhesive layer 430 includes one adhesive layer. The scheme of the intermediate adhesive layer 430 including a plurality of adhesive layers may be described below, and the embodiments of the present application will not be repeated.
The surface of the intermediate adhesive layer 430 in contact with the first adhesive layer 410 may be planar; the surface of the intermediate adhesive layer 430 that contacts the first adhesive layer 410 may also be non-planar. For example, referring to fig. 5, the surface of the intermediate adhesive layer 430 facing the first adhesive layer 410 may be provided with a plurality of first grooves 432 arranged at intervals. The surface of the first adhesive layer 410 facing the middle adhesive layer 430 is provided with a plurality of first protrusions 411, the plurality of first protrusions 411 and the plurality of first grooves 432 are arranged in a one-to-one correspondence, and each first protrusion 411 is embedded into the corresponding first groove 432. The first grooves 432 and the first protrusions 411 fitted to each other can increase the contact area between the first adhesive layer 410 and the intermediate adhesive layer 430, thereby improving the connection strength between the first adhesive layer 410 and the intermediate adhesive layer 430.
The surface of the intermediate adhesive layer 430 in contact with the second adhesive layer 420 may be planar; the surface of the intermediate adhesive layer 430 that contacts the second adhesive layer 420 may also be non-planar. For example, referring to fig. 5, the surface of the intermediate adhesive layer 430 facing the second adhesive layer 420 may be provided with a plurality of second grooves 435 arranged at intervals. The surface of the second adhesive layer 420 facing the middle adhesive layer 430 is provided with a plurality of second protrusions 421, the plurality of second protrusions 421 and the plurality of second grooves 435 are arranged in a one-to-one correspondence manner, and each second protrusion 421 is embedded into the corresponding second groove 435. The second grooves 435 and the second protrusions 421, which are engaged with each other, can increase the contact area between the second adhesive layer 420 and the intermediate adhesive layer 430, thereby improving the connection strength between the second adhesive layer 420 and the intermediate adhesive layer 430.
With continued reference to fig. 5, the first grooves 432 and the second grooves 435 may be spaced apart from each other and staggered. By the arrangement, the contact area between the intermediate adhesive layer 430 and the first and second adhesive layers 410 and 420 can be increased, and the connection strength between the intermediate adhesive layer 430 and the first and second adhesive layers 410 and 420 can be improved; and simultaneously, the local thickness of the middle adhesive layer 430 can be prevented from being too small, and the strength of the middle adhesive layer 430 is ensured.
The inside of the intermediate adhesive layer 430 may also be provided with a light shielding film layer 433. The light shielding film layer 433 can improve the overall strength of the double-sided tape 40, and further prevent the inside of the double-sided tape 40 from being damaged and reduce the deformation amount of the double-sided tape 40 after the display module is used for a long time or in a high temperature environment. Illustratively, the material of the light shielding film layer 433 may include at least one of polyethylene, polyethylene terephthalate, or polyimide. Illustratively, the thickness of the light shielding film layer 433 may be 4 to 6 μm, for example, 4 μm, 5 μm, or 6 μm.
Illustratively, the light-shielding film layer 433 is also capable of absorbing light, such as ultraviolet light, used when the intermediate adhesive layer 430 is crosslinked with the first and second adhesive layers 410 and 420. When the ultraviolet light irradiates the first adhesive layer 410 and the middle adhesive layer 430 from the side of the first adhesive layer 410 facing away from the middle adhesive layer 430, so that the surfaces of the first adhesive layer 410 and the middle adhesive layer 430 are crosslinked, the light shielding film 433 can absorb the ultraviolet light entering the middle adhesive layer 430, so as to block the ultraviolet light, prevent the ultraviolet light from entering the rest of the middle adhesive layers 430, and avoid the rest of the middle adhesive layers 430 from being crosslinked, thereby ensuring that the rest of the middle adhesive layers 430 can be crosslinked with the surfaces of the second adhesive layer 420.
When ultraviolet light irradiates the second adhesive layer 420 and the middle adhesive layer 430 from one side of the second adhesive layer 420 facing away from the middle adhesive layer 430, so that crosslinking occurs between the surfaces of the second adhesive layer 420 and the middle adhesive layer 430, the light shielding film 433 can absorb the ultraviolet light entering the middle adhesive layer 430, block the ultraviolet light, prevent the ultraviolet light from entering the rest of the middle adhesive layer 430, and avoid crosslinking of the rest of the middle adhesive layer 430, so as to ensure crosslinking between the surfaces of the rest of the middle adhesive layer 430 contacting the first adhesive layer 410, and further ensure the balance of the connection strength between the middle adhesive layer 430 and the first adhesive layer 410 and the second adhesive layer 420.
Illustratively, the light shielding film layer 433 may be a black film layer. It is understood that the light shielding film 433 may be a film of other colors, so long as the light used when the middle adhesive layer 430 is crosslinked with the first adhesive layer 410 and the second adhesive layer 420 can be blocked, and the embodiments of the present application will not be repeated.
Referring to fig. 6, the embodiment of the application further provides a method for manufacturing the double-sided tape, which includes:
s1, providing an intermediate adhesive layer.
Illustratively, referring to fig. 7, a first transparent carrier film 440 is first provided. Illustratively, one side surface of the first transparent base film 440 may have a plurality of third protrusions 441 arranged at intervals.
An intermediate adhesive layer 430 is formed on a side of the first transparent base film 440 having the third protrusions 441. For example, referring to fig. 7, a first preset glue 436 may be first applied to a side surface of the first transparent base film 440 having the third protrusions 441.
The manufacturing method of the embodiment of the application can further comprise providing the shading film layer 433. Referring to fig. 8, a side surface of the light shielding film 433 is attached to a side surface of the first preset adhesive 436 facing away from the first transparent base film 440, and the first preset adhesive 436 is continuously coated on a side of the light shielding film 433 facing away from the first preset adhesive 436.
By the above manufacturing method, the light shielding film layer 433 can be formed inside the intermediate adhesive layer 430. The light shielding film layer 433 can improve the overall strength of the double-sided tape 40, prevent the inside of the double-sided tape 40 from being damaged after the display module is used for a long time or when it is used in a high temperature environment, and reduce the deformation amount of the double-sided tape 40.
Referring to fig. 9, a second transparent base film 450 opposite to the first transparent base film 440 is provided. Illustratively, the second transparent base film 450 has a plurality of fourth protrusions 451 arranged at intervals toward a side surface of the intermediate adhesive layer 430.
Then, pressure is applied to the first preset glue 436 through the second transparent base film 450 to form a plurality of first grooves 432 sleeved on the plurality of third protrusions 441 at a side of the first preset glue 436 facing the first transparent base film 440, and a plurality of second grooves 435 sleeved on the plurality of fourth protrusions 451 at a side of the first preset glue 436 facing the second transparent base film 450.
In some implementations of the embodiment of the present application, after the first groove 432 and the second groove 435 are formed on both sides of the middle adhesive layer 430 by the first transparent base film 440 and the second transparent base film 450, light irradiation, such as ultraviolet light irradiation, may be performed on a side of the first transparent base film 440 facing away from the first preset adhesive 436. Ultraviolet light passes through the first transparent base film 440 to reach the first preset glue 436 between the first transparent base film 440 and the light shielding film layer 433, so as to pre-cure the part of the first preset glue 436, so that the part of the first preset glue 436 forms an oligomer with low crosslinking degree; while enabling the preliminary molding of the portion of the first predetermined glue 436 to form the first sub-glue layer 431.
Then, light irradiation, such as ultraviolet light irradiation, may be performed on a side of the second transparent base film 450 facing away from the first preset glue 436, and the ultraviolet light passes through the second transparent base film 450 to reach the first preset glue 436 between the second transparent base film 450 and the light shielding film layer 433, so as to pre-cure the part of the first preset glue 436, so that the part of the first preset glue 436 forms an oligomer with low crosslinking degree; while enabling the preliminary molding of the portion of the first predetermined glue 436 to form the second sub-glue layer 434, the second sub-glue layer 434 and the first sub-glue layer 431 form the intermediate glue layer 430.
The first pre-setting adhesive 436 is pre-cured to form the intermediate adhesive layer 430, and deformation of the intermediate adhesive layer 430 during subsequent removal of the first transparent base film 440 and the second transparent base film 450 can be avoided.
S2, forming a first bonding layer on one side of the middle adhesive layer, wherein the crosslinking degree of the first bonding layer is smaller than that of the middle adhesive layer.
For example, the first transparent base film 440 may be removed first, and a second preset adhesive may be applied to a surface of the middle adhesive layer 430 on the side having the first groove 432. For example, a second preset adhesive may be applied to a surface of the first sub adhesive layer 431 opposite to the light shielding film layer 433. And then covering the first release film on the second preset adhesive.
Illustratively, pressure may be applied to the first release film 460 and the second pre-determined glue to form a plurality of first protrusions 411 embedded in the first grooves 432 on a side of the second pre-determined glue facing the middle glue layer 430. The first grooves 432 and the first protrusions 411 fitted to each other can increase the contact area between the first adhesive layer 410 and the intermediate adhesive layer 430 formed later, thereby improving the connection strength between the first adhesive layer 410 and the intermediate adhesive layer 430.
For example, after forming a second preset adhesive on a side surface of the first sub-adhesive layer 431 facing away from the light shielding film layer 433 and covering the first release film on the second preset adhesive, the first release film may be irradiated with light, for example, ultraviolet light. The ultraviolet light can cure the second preset glue to form a first bonding layer 410, and the first bonding layer 410 forms an oligomer with low crosslinking degree, so that the first bonding layer 410 has higher initial viscosity; at the same time, the first adhesive layer 410 and the first sub adhesive layer 431 can be cross-linked to each other, so that the connection strength between the intermediate adhesive layer 430 and the first adhesive layer 410 can be improved; and the first sub-adhesive layer 431 can be further crosslinked and polymerized to obtain a high polymer with high crosslinking degree, so that the crosslinking degree of the first sub-adhesive layer 431 is greater than that of the first adhesive layer 410, and the holding viscosity of the intermediate adhesive layer 430 is improved.
The light shielding film 433 can absorb light, such as ultraviolet light, used when the first sub-adhesive layer 431 and the first adhesive layer 410 are crosslinked with each other, prevent the ultraviolet light from entering the second sub-adhesive layer 434, prevent the second sub-adhesive layer 434 from being crosslinked in advance, and prevent the second sub-adhesive layer 434 from being crosslinked again when the second sub-adhesive layer 434 is irradiated with ultraviolet light in the subsequent process step, thereby ensuring the consistency of the crosslinking degree of the intermediate adhesive layer 430; and simultaneously, the second sub-adhesive layer 434 and the second adhesive layer 420 can be prevented from being crosslinked in advance, so that the second sub-adhesive layer 434 can be crosslinked again when being crosslinked with the second adhesive layer 420 in the subsequent process step, and the consistency of the connection strength between the intermediate adhesive layer 430 and the first adhesive layer 410 and the connection strength between the intermediate adhesive layer 430 and the second adhesive layer 420 is further ensured.
S3, forming a second bonding layer on one side of the middle adhesive layer, which is opposite to the first bonding layer, wherein the crosslinking degree of the second bonding layer is smaller than that of the middle adhesive layer.
Illustratively, the second transparent base film 450 is removed, and a third pre-set adhesive is applied to the side surface of the middle adhesive layer 430 having the second groove 435. For example, a third preset adhesive may be applied to a surface of the second sub-adhesive layer 434 opposite to the light shielding film layer 433. And then a second release film 470 is coated on the third preset adhesive.
Illustratively, pressure may be applied to the second release film 470 and the third pre-determined glue to form a plurality of second protrusions 421 embedded in the second grooves 435 on a side of the third pre-determined glue facing the middle glue layer 430. The second grooves 435 and the second protrusions 421, which are engaged with each other, can increase the contact area between the second adhesive layer 420 and the intermediate adhesive layer 430, which are formed later, thereby improving the connection strength between the second adhesive layer 420 and the intermediate adhesive layer 430.
Illustratively, after forming a third preset adhesive on a side surface of the second sub-adhesive layer 434 facing away from the light shielding film layer 433 and covering the second release film on the third preset adhesive, the second release film may be irradiated with light, for example, ultraviolet light. The ultraviolet light can cure the third preset glue to form a second bonding layer 420, and the second bonding layer 420 forms an oligomer with low crosslinking degree, so that the second bonding layer 420 has higher initial viscosity; at the same time, the second adhesive layer 420 and the second sub-adhesive layer 434 can be cross-linked to each other, so that the connection strength between the intermediate adhesive layer 430 and the second adhesive layer 420 can be improved; and the second sub-adhesive layer 434 can be further crosslinked and polymerized to obtain a high polymer with high crosslinking degree, so that the crosslinking degree of the second sub-adhesive layer 434 is greater than that of the second adhesive layer 420, and the holding viscosity of the intermediate adhesive layer 430 is improved.
The light shielding film 433 can absorb light, such as ultraviolet light, used when the second sub-adhesive layer 434 and the second adhesive layer 420 are crosslinked with each other, so that the ultraviolet light is prevented from entering the first sub-adhesive layer 431, and the first sub-adhesive layer 431 is prevented from being crosslinked again, thereby ensuring the consistency of the crosslinking degree of the intermediate adhesive layer 430; at the same time, the first sub adhesive layer 431 and the first adhesive layer 410 can be prevented from being crosslinked again, so that the consistency of the connection strength between the intermediate adhesive layer 430 and the first adhesive layer 410 and the connection strength between the intermediate adhesive layer 430 and the second adhesive layer 420 is ensured.
In some implementations of the embodiment of the present application, the order of step S2 and step S3 may be adjusted, that is, the second adhesive layer 420 may be formed on one side of the intermediate adhesive layer 430, and then the first adhesive layer 410 may be formed on the side of the intermediate adhesive layer 430 facing away from the second adhesive layer 420.
Illustratively, referring to fig. 10, after the first pre-set glue 436 is pre-cured to form the intermediate glue layer 430, the second transparent base film 450 may be removed first, and the third pre-set glue 422 may be formed on the intermediate glue layer 430. Then, the second release film 470 is covered on the side of the third preset glue 422 facing away from the middle glue layer 430. Pressure is applied to the second release film 470 and the third preset glue 422 to form a plurality of second protrusions 421 embedded in the second grooves 435 on the side of the second adhesive layer 420 facing the middle glue layer 430.
Referring to fig. 11, the second release film 470 is then irradiated with light, for example, ultraviolet light, on the side facing away from the second sub-adhesive layer 434, so that the third preset adhesive 422 is cured to form the second adhesive layer 420, and the surfaces of the second adhesive layer 420 and the intermediate adhesive layer 430, which are in contact, are crosslinked with each other.
Then, the position of the manufactured double-sided tape semi-finished product is adjusted, i.e., the manufactured double-sided tape semi-finished product is turned upside down, so that the first transparent bottom film 440 is positioned above each adhesive layer.
Referring to fig. 12, the first transparent base film 440 is removed, and a second pre-set glue 412 is formed on the side of the middle glue layer 430 having the first groove 432. The side of the second pre-determined glue 412 facing away from the middle glue layer 430 is then covered with a first release film 460. Pressure is applied to the first release film 460 and the second preset glue 412 to form a plurality of first protrusions 411 embedded in the first grooves 432 on a side of the second preset glue 412 facing the middle glue layer 430.
Referring to fig. 13, the side of the first release film 460 facing away from the intermediate adhesive layer 430 is then irradiated with light, for example, ultraviolet light, to cure the second preset adhesive 412 to form the first adhesive layer 410, and the surfaces of the first adhesive layer 410 and the intermediate adhesive layer 430 that are in contact are crosslinked with each other.
In this way, in the manufacturing process of the double-sided tape 40, the position of the manufactured double-sided tape semi-finished product is only required to be adjusted once, so that the process steps can be saved, and the production efficiency of the double-sided tape 40 can be improved.
Referring to fig. 14, both sides of the double-sided tape 40 manufactured by the above-described manufacturing method are covered with a first release film 460 and a second release film 470, respectively. Before the double-sided tape 40 is attached to the display portion 10 or the binding portion 20, the first release film 460 and the second release film 470 may be peeled off to adhere the first adhesive layer 410 or the second adhesive layer 420 to the display portion 10 or the binding portion 20.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (13)
1. The double-sided adhesive tape is used for a display module and is characterized by comprising a first adhesive layer, a second adhesive layer and an intermediate adhesive layer positioned between the first adhesive layer and the second adhesive layer, wherein the crosslinking degree of the intermediate adhesive layer is greater than that of the first adhesive layer and the second adhesive layer;
The surfaces of the intermediate adhesive layer, which are contacted with the first adhesive layer, are mutually crosslinked; the surfaces of the intermediate adhesive layer and the second adhesive layer, which are contacted with each other, are crosslinked with each other;
The crosslinking means that respective carbon-carbon double bonds between the intermediate adhesive layer and the first bonding layer and between the intermediate adhesive layer and the second bonding layer are opened under the action of a photoinitiator to form new chemical bond connection and form a net-shaped interweaved structure, and the structure can enable the intermediate adhesive layer, the first bonding layer and the second bonding layer to be integrated at the contact position, so that the connection strength of the intermediate adhesive layer, the first bonding layer and the intermediate adhesive layer, and the second bonding layer is improved;
A shading film layer is arranged in the middle adhesive layer; the light shielding film layer can absorb light used when the intermediate adhesive layer is crosslinked with the first adhesive layer and the second adhesive layer.
2. The double-sided tape of claim 1, wherein the intermediate adhesive layer has an initial viscosity that is less than the initial viscosity of the first and second adhesive layers.
3. The double-sided tape of claim 2, wherein the materials of the first adhesive layer, the second adhesive layer, and the intermediate adhesive layer each comprise an acrylic resin.
4. The double-sided tape according to claim 1 or 2, wherein the intermediate adhesive layer has a degree of polymerization greater than that of the first and second adhesive layers.
5. The double-sided tape according to claim 4, wherein the material of the light shielding film layer comprises at least one of polyethylene, polyethylene terephthalate, or polyimide.
6. The double-sided tape according to claim 5, wherein the light shielding film layer is a black film layer.
7. The double-sided tape according to claim 1 or 2, wherein the surface of the intermediate adhesive layer facing the first adhesive layer is provided with a plurality of first grooves arranged at intervals; the surface of the first bonding layer facing the middle adhesive layer is provided with a plurality of first bulges, the first bulges and the first grooves are arranged in a one-to-one correspondence manner, and each first bulge is embedded into the corresponding first groove;
And/or a plurality of second grooves which are arranged at intervals are arranged on the surface of the middle adhesive layer facing the second adhesive layer; the second bonding layer is provided with a plurality of second bulges towards the surface of the middle adhesive layer, the second bulges and the first grooves are arranged in a one-to-one correspondence manner, and each second bulge is embedded into the corresponding second groove.
8. The double-sided tape according to claim 7, wherein the first grooves and the second grooves are spaced apart from each other and are staggered.
9. A method for manufacturing a double-sided tape for a display module, which is applied to the double-sided tape according to any one of claims 1 to 8, comprising:
Providing an intermediate adhesive layer;
Forming a first adhesive layer on one side of the middle adhesive layer, wherein the crosslinking degree of the first adhesive layer is smaller than that of the middle adhesive layer;
And forming a second bonding layer on one side of the middle adhesive layer, which is opposite to the first bonding layer, wherein the crosslinking degree of the second bonding layer is smaller than that of the middle adhesive layer.
10. The method of manufacturing a double-sided tape according to claim 9, wherein the providing an intermediate adhesive layer comprises:
providing a first transparent bottom film, wherein one side surface of the first transparent bottom film is provided with a plurality of third bulges which are arranged at intervals;
Coating a first preset adhesive on the surface of one side of the first transparent bottom film with the third bulge;
Providing a second transparent bottom film opposite to the first transparent bottom film, wherein a side surface of the second transparent bottom film facing the first transparent bottom film is provided with a plurality of fourth bulges which are arranged at intervals;
Applying pressure to the first preset glue through the second transparent bottom film to form a plurality of first grooves sleeved on the third bulges on the surface of one side, facing the first transparent bottom film, of the first preset glue, and form a plurality of second grooves sleeved on the fourth bulges on the surface of one side, facing the second transparent bottom film, of the first preset glue;
And carrying out illumination on the first transparent bottom film and the second transparent bottom film, and curing the first preset glue to form an intermediate glue layer.
11. The method of manufacturing a double-sided tape according to claim 10, further comprising:
Providing a shading film layer;
The providing a light shielding film layer includes: after the first preset glue is coated on the side surface of the first transparent bottom film, which is provided with the third bulge, one side surface of the light shielding film layer is attached to the side surface, far away from the first transparent bottom film, of the first preset glue, and the first preset glue is continuously coated on the other side surface of the light shielding film layer.
12. The method of any one of claims 9-11, wherein forming a first adhesive layer on one side of the middle adhesive layer comprises:
coating a second preset adhesive on one side surface of the middle adhesive layer, and covering a first release film on the second preset adhesive;
And (3) irradiating the first release film, and curing the second preset adhesive to form the first adhesive layer, wherein the surfaces of the first adhesive layer and the intermediate adhesive layer, which are in contact, are mutually crosslinked.
13. The method of any one of claims 9-11, wherein forming a second adhesive layer on a side of the intermediate adhesive layer facing away from the first adhesive layer comprises:
coating a third preset adhesive on the surface of one side of the middle adhesive layer, which is opposite to the first adhesive layer; covering a second release film on the third preset adhesive;
and (3) irradiating the second release film, and curing the third preset adhesive to form the second adhesive layer, wherein the surfaces of the second adhesive layer and the middle adhesive layer, which are contacted, are mutually crosslinked.
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| CN202210719354.6A CN115044309B (en) | 2022-06-23 | 2022-06-23 | Double-sided adhesive tape and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210719354.6A CN115044309B (en) | 2022-06-23 | 2022-06-23 | Double-sided adhesive tape and manufacturing method thereof |
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| CN115044309A CN115044309A (en) | 2022-09-13 |
| CN115044309B true CN115044309B (en) | 2024-04-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397905A (en) * | 1979-11-08 | 1983-08-09 | Hoechst Aktiengesellschaft | Adhesive tape |
| CN105419671A (en) * | 2016-01-04 | 2016-03-23 | 京东方科技集团股份有限公司 | Adhesive tape, manufacturing method thereof and display device |
| CN111667769A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Bonding structure, manufacturing method thereof and display device |
| CN212864656U (en) * | 2020-08-12 | 2021-04-02 | 厦门名硕工贸有限公司 | Combined double-sided adhesive tape |
| CN113570966A (en) * | 2021-07-08 | 2021-10-29 | 深圳市华星光电半导体显示技术有限公司 | Display device and spliced screen |
-
2022
- 2022-06-23 CN CN202210719354.6A patent/CN115044309B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397905A (en) * | 1979-11-08 | 1983-08-09 | Hoechst Aktiengesellschaft | Adhesive tape |
| CN105419671A (en) * | 2016-01-04 | 2016-03-23 | 京东方科技集团股份有限公司 | Adhesive tape, manufacturing method thereof and display device |
| CN111667769A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Bonding structure, manufacturing method thereof and display device |
| CN212864656U (en) * | 2020-08-12 | 2021-04-02 | 厦门名硕工贸有限公司 | Combined double-sided adhesive tape |
| CN113570966A (en) * | 2021-07-08 | 2021-10-29 | 深圳市华星光电半导体显示技术有限公司 | Display device and spliced screen |
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| Publication number | Publication date |
|---|---|
| CN115044309A (en) | 2022-09-13 |
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