CN218932012U - Glue - Google Patents

Abstract

The application provides a glue, solves the technical problems of low tensile strength, poor die cutting property and easy breaking and low reworking efficiency of OCA glue in the prior art. The first surface material adhesive layer and the second surface material adhesive layer are covered on the upper surface and the lower surface of the substrate adhesive layer to form a three-layer structure after being compounded, so that the cohesive strength and the tensile strength of the adhesive are improved, the integral strength of the adhesive is improved, and the situation that the adhesive is easy to break in the use process is avoided; meanwhile, as the glue adopts a three-layer structure, the die cutting performance of the glue is improved. During the reworking, the OCA adhesive and the attached object can be separated by heating and disassembling, so that the OCA adhesive is easy to remove, and the reworking efficiency is improved.

Description

Glue

Technical Field

The utility model relates to the technical field of glue, in particular to glue.

Background

OCA (Optical clear adhesive) is used for bonding transparent optical elements (such as cell phones or tablets). For example: the OCA bonds the touch module and the display module, specifically, one side of the OCA is bonded to the cover plate CG (Cover Glass), and the other side of the OCA is bonded to the Polarizer (POL). OCA has wide application range and large dosage in the display laminating field; OCA has higher requirements on die cutting property, filling property, reworking efficiency and reworking material utilization rate of OCA in the laminating process and the reworking process.

In the prior art, OCA has a single-layer structure, wherein the single-layer structure OCA colloid is soft in whole and easy to overflow, and the die cutting property is poor. Meanwhile, when defects (such as bubbles, mura and the like) occur in bonding by using OCA, reworking is required to be carried out on the bonding sheet, the bonding sheet is frozen first, the adhesive layer between the polaroid and the cover plate is separated, and the probability of damage to the polaroid due to freezing separation is high under normal conditions; residual glue can remain on the separated polaroid, and the polaroid is required to be placed on a heating table again to soften the colloid, or the residual glue is thoroughly removed by wiping with an alcohol solvent; the colloid is easily broken in the reworking process; the freezing reworking efficiency is low, damage is caused to the polaroid and the attached cover plate, and reworking materials are low in utilization, so that the working efficiency is influenced.

Disclosure of Invention

In view of this, this application provides a kind of glue, solves the tensile strength low, the cross cutting nature of OCA glue among the prior art poor and easily breaks, the low technical problem of rework efficiency.

According to one aspect of the present application, there is provided a glue comprising: a substrate glue layer; the first surface material adhesive layer is attached to the first surface of the base material adhesive layer; the second surface material adhesive layer is attached to the second surface of the base material adhesive layer; wherein the first face and the second face are opposite faces.

In one possible implementation, the substrate glue layer is an optical pressure sensitive adhesive layer.

In one possible implementation, the first facestock adhesive layer and the second facestock adhesive layer are both optical pressure sensitive adhesive layers.

In one possible implementation, the substrate glue layer thickness is set to 75-125um.

In one possible implementation, the first facestock layer thickness is set to 25-50um; the thickness of the second surface material adhesive layer is set to be 25-50um.

In one possible implementation, the adhesive layer of the substrate has a viscosity of greater than or equal to 10n/25mm; and/or, the tensile strength of the substrate glue layer is greater than or equal to 1.0MPa.

In one possible implementation, the first facestock bond layer has a storage modulus of less than 3.0 x 105Pa; the storage modulus of the second facestock adhesive layer is less than 3.0X105 Pa.

In one possible implementation, the method further includes: and the first stripping layer is glued with the first surface material adhesive layer, and the first stripping layer is positioned on the opposite surface of the substrate material adhesive layer.

In one possible implementation, the method further includes: and the second stripping layer is glued with the second surface material glue layer, and the second stripping layer is positioned on the opposite surface of the substrate glue layer.

In one possible implementation, the release force of the first release layer is 5-10 grams/25 millimeters; and/or the release force of the second release layer is 15-30 g/25 mm.

According to the adhesive, the first surface material adhesive layer and the second surface material adhesive layer are covered on the upper surface and the lower surface of the substrate adhesive layer to form a three-layer structure after being compounded, so that the cohesive strength and the tensile strength of the adhesive are improved, the overall strength of the adhesive is improved, and the situation that the adhesive is easy to break in the use process is avoided; meanwhile, as the glue adopts a three-layer structure, the die cutting performance of the glue is improved. During the reworking, the OCA adhesive and the attached object can be separated by heating and disassembling, so that the OCA adhesive is easy to remove, and the reworking efficiency is improved.

Drawings

The foregoing and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.

FIG. 1 is a schematic cross-sectional view of a glue according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a glue according to another embodiment of the present application;

fig. 3 is a schematic cross-sectional structure of a glue according to another embodiment of the present application.

Reference numerals:

1. a substrate glue layer; 2. a first facestock glue layer; 3. a second facestock adhesive layer; 4. a first release layer; 5. and a second release layer.

Detailed Description

In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back, top, bottom … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The technical scheme of the present utility model will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present utility model based on the embodiments of the present utility model.

OCA glue, special adhesive used for cementing transparent optical element (such as lens, etc.); the adhesive has the characteristics of no color, transparency, light transmittance of more than 95%, good cementing strength, capability of being cured at room temperature or medium temperature or being cured by UV, small curing shrinkage and the like. OCA glue is one of the important touch screen raw materials. OCA gels fall into two broad categories, one being resistive and one being capacitive.

The OCA adhesive can be applied to different fields according to different thicknesses, and can be applied to the following fields: plastic materials such as electronic paper, transparent device bonding, projection screen assembly, aerospace or military optics assembly, display assembly, lens assembly, resistive touch screen g+f+ F, F +f, capacitive touch screen, panel, ICON, and glass, and polycarbonate are applied to the glue.

In the prior art, the OCA glue has a single-layer structure, wherein the single-layer structure OCA glue is soft in whole and easy to overflow, and the die cutting property is poor; the colloid has low overall strength, so that the colloid is easy to break during the processing.

To solve the above problems, according to an aspect of the present application, the present application provides a glue to solve the above technical problems.

FIG. 1 is a schematic cross-sectional view of a glue according to an embodiment of the present application; as shown in fig. 1, the glue comprises: a base material adhesive layer 1; the first surface material adhesive layer 2 is attached to the first surface of the base material adhesive layer 1; and a second surface adhesive layer 3, wherein the second surface adhesive layer 3 is attached to the second surface of the base material adhesive layer 1; wherein the first surface and the second surface are opposite surfaces. This substrate glue film 1 is with improving gluey cohesive strength, covers first face material glue film 2, second face material glue film 3 from top to bottom at substrate glue film 1 to improve the tensile strength of gluing, thereby with the bulk strength who improves gluing, avoid gluing the condition that appears breaking easily when using, simultaneously, owing to glue adopts three layer construction, also strengthened the cross cutting performance of gluing.

According to the adhesive, the first surface material adhesive layer 2 and the second surface material adhesive layer 3 are covered on the upper surface and the lower surface of the base material adhesive layer 1 to form a three-layer structure after being compounded, so that the cohesive strength and the tensile strength of the adhesive are improved, the overall strength of the adhesive is improved, and the situation that the adhesive is easy to break in the use process is avoided; meanwhile, as the glue adopts a three-layer structure, the die cutting performance of the glue is improved; and the glue can be disassembled by heating during the process of returning, so that the phenomenon of glue fracture is avoided in the process of removing the glue. Because the cohesive strength and the tensile strength of the adhesive are higher, the adhesive is not easy to break when the adhesive is used, and the qualification rate of the cemented optical element is improved. During the reworking, the OCA adhesive and the attached object can be separated by heating and disassembling, so that the OCA adhesive is easy to remove, and the reworking efficiency is improved.

The core of the technology is that the cohesive strength and the tensile strength of the adhesive, namely the integral strength of the adhesive are improved on the premise of unchanged thickness, so that the die cutting performance of the adhesive is improved; the phenomenon that the glue breaks in the using process is avoided; in particular, the glue can be disassembled by heating during the process of returning, and the phenomenon of breaking the glue is avoided during the process of removing the glue.

It is easy to understand that the adhesive structure in the application has high overall strength, and the adhesive adopts a three-layer structure formed by compositing the first surface material adhesive layer 2 and the second surface material adhesive layer 3 which are covered on the upper side and the lower side of the substrate adhesive layer 1; therefore, in the concrete preparation implementation process, the first surface material adhesive layer 2 is coated on the first surface of the substrate adhesive layer 1 through the slit coating head, the second surface material adhesive layer 3 is coated on the second surface of the substrate adhesive layer 1, the substrate adhesive layer 1 is cured by UV curing in advance to form a cured adhesive film, and the first surface material adhesive layer 2 and the second surface material adhesive layer 3 are solvent type acrylate pressure-sensitive adhesives and are respectively attached to the substrate adhesive layer 1 after being formed by thermal curing. The adhesive structure has high overall strength, and avoids the phenomenon of adhesive overflow in the subsequent use process; and the glue can be disassembled by heating during the process of returning, so that the phenomenon of glue fracture is avoided in the process of removing the glue. In one possible implementation, as shown in fig. 1, the substrate adhesive layer 1 is an optical pressure-sensitive adhesive layer, for example, the substrate adhesive layer 1 is obtained by UV curing and molding of a UV acrylate pressure-sensitive adhesive. The optical adhesive film layer is formed by mixing the acrylic ester prepolymer into a diluent monomer, a photoinitiator and a cross-linking agent to form acrylic ester polymer slurry, and the acrylic ester polymer slurry is realized in a UV curing mode to form an optical pressure-sensitive adhesive layer; the cohesive strength and the tensile strength of the optical adhesive film layer formed after photo-curing are improved, namely the strength of the optical adhesive is improved, so that the die cutting property of the adhesive is improved.

In one possible implementation, as shown in fig. 1, the first facestock layer 2 and the second facestock layer 3 are both optical pressure sensitive adhesive layers. Through laminating first face material glue film 2, second face material glue film 3 respectively with substrate glue film 1, owing to first face material glue film 2 and second face material glue film 3 are the pressure sensitive adhesive layer, owing to the pressure sensitive adhesive layer has good viscidity, when consequently laminating first face material layer, second face material layer and substrate glue film 1 to improve the interlaminar cohesion of gluing, thereby make glues have better filling nature and mobility.

Specifically, the first facestock adhesive layer 2 and the second facestock adhesive layer 3 are obtained by a solvent type acrylate pressure-sensitive adhesive thermosetting mode.

Among them, optical Pressure Sensitive Adhesives (PSAs) are a class of adhesives that have sensitivity to pressure. The pressure-sensitive adhesive is called as pressure-sensitive adhesive, also commonly called as self-adhesive, and is called as pressure-sensitive adhesive for short.

Specifically, the first facestock adhesive layer 2 and the second facestock adhesive layer 3 are both acrylate pressure sensitive adhesive layers.

The acrylic acid ester pressure-sensitive adhesive layer is coated by acrylic acid ester polymer solution formed by solution polymerization, and the acrylic acid ester pressure-sensitive adhesive layer is formed after drying and removing the solvent; the acrylic pressure-sensitive adhesive layer is softer, so that the acrylic pressure-sensitive adhesive layer provides fluidity to the adhesive, and the filling property requirement of the OCA is easily met. Through the acrylic acid ester pressure-sensitive adhesive layers of the first surface material adhesive layer 2 and the second surface material adhesive layer 3, the acrylic acid ester pressure-sensitive adhesive layers are respectively combined with the optical adhesive film layers of the base material adhesive layer 1, the optical adhesive film layers provide cohesive strength and tensile strength for the adhesive, and the acrylic acid ester pressure-sensitive adhesive layers provide good filling property for the adhesive, so that the adhesive has good die cutting property and filling property and high strength.

The acrylic pressure-sensitive adhesive can be classified into solvent type, emulsion type, reaction type, pressure-sensitive type, instant type, anaerobic type, photosensitive type, hot melt type, etc. according to the form and application characteristics of the adhesive.

In the specific implementation process, an optical adhesive base material adhesive layer is formed through photo-curing, and a solvent type acrylic pressure-sensitive adhesive is formed by adopting an acrylic polymer solution polymerized by a solution to the first surface material adhesive layer 2 and the second surface material adhesive layer 3; and extruding the solvent type acrylic acid ester pressure-sensitive adhesive by adopting a slit coating head, coating the solvent type acrylic acid ester pressure-sensitive adhesive on the first surface and the second surface of the base material adhesive layer 1, and coating to form the three-layer structure adhesive. The viscosity of the solvent-based acrylic acid ester pressure-sensitive adhesive is not required to be limited when the solvent-based acrylic acid ester pressure-sensitive adhesive is coated by a slit coating head, so that the implementation process is simple; and the equipment is coated by a slit coating head, so that the cost is low and the process cost is reduced.

It is readily understood that acrylate pressure sensitive adhesives are self-adhesive materials that form relatively strong adhesive forces with relatively little effort; is a kind of glue which can be tightly adhered to an adherend by applying light finger pressure without using solvents, heat or other means.

In one possible implementation, as shown in fig. 1, the thickness of the substrate glue layer 1 is set to 75-125um; so that the base material adhesive layer 1 is thicker, thereby improving the hardness of the base material adhesive layer 1.

When the thickness of the base material adhesive layer 1 is 75 to 125 μm, the tensile strength is controlled to be not less than 1.0MPa, and the OCA is not easily broken during the returning process. The binding force (on glass) of the intermediate layer is more than or equal to 10N/25mm; so as to avoid the risk of separation at the joint of the substrate adhesive layer 1 and the first and second surface adhesive layers 2 and 3.

Alternatively, the thickness of the base material adhesive layer 1 is set to 75 μm, 85 μm, 95 μm, 105 μm, 115 μm, 125 μm, or the like.

In one possible implementation, as shown in fig. 1, the first facestock layer 2 is set to a thickness of 25-50um; the thickness of the second facestock glue layer 3 is set to 25-50um. The thickness of the substrate adhesive layer 1 is known, and the thicknesses of the first and second surface adhesive layers 2 and 3 are smaller than the thickness of the substrate adhesive layer 1, i.e., the first and second surface adhesive layers 2 and 3 are thinner than the substrate adhesive layer 1, so that the first and second surface adhesive layers 2 and 3 have good filling property.

Optionally, the thickness of the first panel adhesive layer 2 is set to 25um, 30um, 35um, 40um, 45um, 50um; the thickness of the second face material adhesive layer 3 is set to 25um, 30um, 35um, 40um, 45um and 50um.

In one possible implementation, as shown in fig. 1, the adhesive of the substrate glue layer 1 is greater than or equal to 10n/25mm; so that the adhesive formed after the base material adhesive layer 1 is attached to the first surface material adhesive layer 2 and the second surface material adhesive layer 3 has strong interlayer binding force, and the phenomenon of separation of the adhesive in the using process is avoided.

In one possible implementation, as shown in fig. 1, the first facestock layer 2 has a storage modulus of less than 3.0 x 105Pa; the storage modulus of the second facestock glue layer 3 is less than 3.0×105Pa; thus, by defining the storage modulus of the first and second facestock layers 2, 1, the fillability of the first and second facestock layers can be ensured. The tensile modulus of the base material adhesive layer is more than or equal to 1.0MPa, so that the formed adhesive is small in elastic deformation and high in rigidity, and the strength of the adhesive is improved. Meanwhile, when defects occur in the optical element (such as a bonding touch module and a display module) by using the glue, the adhesive is strong in structural adhesiveness and firm in bonding, after a cutting line enters between the touch module and the display module, the phenomenon of internal layering of the glue is reduced, the whole glue is separated from the optical element, and the integrity of the glue in the separation process is ensured, so that the reworking time is saved, and the reworking difficulty is reduced; so that the glue has good reworkability.

In one possible implementation, fig. 2 is a schematic cross-sectional structure of a glue according to another embodiment of the present application, where, as shown in fig. 2, the glue further includes: a first release layer 4, the first release layer 4 being glued to the first facestock glue layer 2, the first release layer 4 being located on the opposite side of the facestock glue layer 1; the use of the first stripping layer 4 can ensure that the glue is not scratched or damaged by external force before use, thereby ensuring the quality of the glue. When the adhesive is used for pasting, the first stripping layer 4 is stripped, and the adhesive can be well pasted through the first face material adhesive layer 2.

Optionally, the first release layer 4 is provided as a first release film to reduce the peel strength between the first release layer 4 and the first facestock layer 2.

Alternatively, the first release film may be a PE release film, a PET release film, an OPP release film, a PC release film, a PS release film, a PMMA release film, a BOPP release film, a PE release film, or the like.

In one possible implementation, fig. 3 is a schematic cross-sectional structure of a glue according to another embodiment of the present application, where, as shown in fig. 3, the glue further includes: and a second release layer 5, wherein the second release layer 5 is glued with the second panel adhesive layer 3, and the second release layer 5 is positioned on the opposite surface of the substrate adhesive layer 1. The second stripping layer 5 can ensure that the glue is not scratched or damaged by external force before being used, thereby ensuring the quality of the glue. When the adhesive is used for adhesion, the second peeling layer 5 is peeled off, and the adhesive can be well adhered through the second surface material adhesive layer 3.

Optionally, the second release layer 5 is provided as a second release film to reduce the peel strength between the second release layer 5 and the second facestock adhesive layer 3.

Alternatively, the second release film may be a PE release film, a PET release film, an OPP release film, a PC release film, a PS release film, a PMMA release film, a BOPP release film, a PE release film, or the like.

In one possible implementation, as shown in fig. 3, the release force of the first release layer 4 needs to be controlled to 5-30 g/25 mm; the release force of the second release layer 5 needs to be controlled to 5-10 g/25 mm; to ensure that the first release film using the first release layer 4, the second release film of the second release layer 5 can better protect the glue.

Specifically, the thickness of the first release film is set to 100um, and the thickness of the second release film is set to 50um; so as to ensure that the first release film and the second release film can better protect the adhesive.

To more clearly illustrate the structure of the gel and its beneficial effects, the preparation process of the gelatin is further described. Specifically, the glue preparation process comprises:

step S1, preparing a substrate adhesive layer 1;

in the step S1, the acrylic ester prepolymer is mixed with a diluent monomer, a photoinitiator and a cross-linking agent to form acrylic ester polymer slurry, and the acrylic ester polymer slurry is cured by UV to form a substrate glue layer 1.

Step S2, preparing a first facestock adhesive layer 2;

the acrylic acid ester polymer solution formed by solution polymerization is dried to remove the solvent, and then the acrylic acid ester pressure sensitive adhesive is formed, and the acrylic acid ester pressure sensitive adhesive is used as the first surface material adhesive layer 2.

Step S3, attaching the first surface material adhesive layer 2 to the first surface of the substrate adhesive layer 1;

step S3, coating the prepared first surface material adhesive layer 2 on the first surface of the substrate adhesive layer 1 by adopting a slit coater for standby.

Step S4, preparing a second facestock adhesive layer 3;

and (3) drying the acrylic polymer solution formed by solution polymerization to remove the solvent to form the acrylic pressure-sensitive adhesive, wherein the acrylic pressure-sensitive adhesive is used as the second facestock adhesive layer 3.

Step S5, bonding the second surface adhesive layer 3 with the second surface of the base material adhesive layer 1 to prepare adhesive; wherein the first surface and the second surface are opposite surfaces;

coating the second surface material adhesive layer 3 on the second surface of the substrate adhesive layer 1 by adopting a slit coater, so that the second surface material adhesive layer 3 and the second surface of the substrate adhesive layer 1 are compounded to form adhesive; the adhesive has a three-layer structure, and provides cohesive strength and tensile strength of adhesive through the intermediate layer substrate adhesive film, namely improves the strength of the adhesive, and avoids the condition that the adhesive is easy to break in the use process. The substrate adhesive layer 1, the first surface adhesive layer 2 and the second surface adhesive layer 3 can be coated by a slit coater adopted in the composite forming process, so that the equipment cost in the manufacturing process is reduced; and the coating process is simple and the production flexibility is high.

Specifically, step S1 (preparation of a substrate glue layer) includes:

step S11, providing a third peeling layer;

providing a third release layer for use;

the third stripping layer comprises a third release film, and specifically a PET release film is selected, and the thickness of the third stripping layer is 75um.

Step S12, coating the optical adhesive on the third stripping layer;

and (3) coating the optical adhesive on the third stripping layer in the step S11, wherein the optical adhesive is formed by mixing an acrylic ester prepolymer into a diluent monomer, a photoinitiator and a crosslinking agent to form acrylic ester polymer slurry, and the acrylic ester polymer slurry is used as the optical adhesive.

It should be noted that, the slit coater is used to coat the optical adhesive on the third peeling layer, and the equipment used in the coating manner is low, so that the feasibility of preparing the substrate adhesive layer 1 is improved, and the cost of the intermediate link of preparing the substrate adhesive layer 1 is reduced.

Step S13, covering the fourth stripping layer on the optical adhesive, and curing to form the substrate adhesive layer 1.

And covering the fourth stripping layer on the optical adhesive, and rolling the cured optical adhesive layer for later use after UV curing, wherein the optical adhesive layer is the substrate adhesive layer 1, and the thickness of the prepared substrate adhesive layer 1 is 125um. The tensile strength of the substrate adhesive layer 1 was 1.5MPa, and the adhesion to glass was 20N/25mm. The adhesive layer 1 of the base material has strong cohesive force and tensile force and provides strength for the adhesive.

Optionally, when the fourth stripping layer is covered on the optical adhesive for curing, a UV curing mode is adopted; wherein, the UV curing mode uses a metal halogen lamp UV light source, UV light irradiates for 8min, the UV light wave band is 320-380nm, the UV light intensity is 50mw/cm2, and the UV light intensity is 500-1000mj/cm ² 。

Specifically, step S2 (preparation of the first facestock layer 2) includes:

step S21 of providing a first peeling layer 4;

providing a first stripping layer 4, wherein the first stripping layer 4 is a fourth release film, and the fourth release film is a PET release film with the thickness of 100 um; the PET release film is a transparent PET release film.

Step S22, coating a first acrylic pressure-sensitive adhesive on the first stripping layer 4, and drying to form a first facestock adhesive layer 2;

and coating the first acrylic pressure-sensitive adhesive on the first stripping layer 4 by adopting a slit coater, placing the first acrylic pressure-sensitive adhesive in an oven at the temperature of 80-120 ℃, and drying the solvent in the first acrylic pressure-sensitive adhesive to obtain the first acrylic pressure-sensitive adhesive, namely the first facestock adhesive layer 2, wherein the thickness of the first facestock adhesive layer 2 is 25um.

It should be noted that the first acrylic pressure-sensitive adhesive is an acrylic polymer solution formed by solution polymerization.

Step S3 (bonding the first side of the first adhesive layer 2 to the first side of the substrate adhesive layer 1) includes:

step S31, removing the third stripping layer of the substrate adhesive layer 1;

the third peeling layer in step S12 is removed.

In step S32, the first acrylic pressure-sensitive adhesive of the first facestock layer 2 is bonded to the first side of the optical adhesive of the base stock layer 1.

The first acrylic acid ester sub-sensitive adhesive of the first surface material adhesive layer 2 is coated on the optical adhesive of the base material adhesive layer 1 by adopting a slit coater, namely the first acrylic acid sub-sensitive adhesive is adhered to the optical adhesive of the base material adhesive layer 1, so that the first surface material adhesive layer 2 and the base material adhesive layer 1 are adhered.

Specifically, step S4 (preparation of the second facestock adhesive layer 3) includes:

step S41 of providing a second peeling layer 5;

providing a second release layer 5, wherein the second release layer 5 is a second release film of 50um, and the second release film is a transparent PET release film of 50um.

Step S42, coating a second acrylic pressure-sensitive adhesive on the second stripping layer 5, and drying to form a second facestock adhesive layer 3;

and coating the second acrylic pressure-sensitive adhesive on the second stripping layer 5 by adopting a slit coater, and drying to remove the solvent in the second acrylic pressure-sensitive adhesive to form a second facestock adhesive layer 3, wherein the thickness of the second facestock adhesive layer 3 is 25um.

It should be noted that the second acrylic pressure-sensitive adhesive is an acrylate polymer solution formed by solution polymerization.

Step S5 (bonding the second facestock adhesive layer 3 to the other surface of the base material adhesive layer 1 to obtain an adhesive) includes:

step S51, removing the fourth stripping layer of the substrate adhesive layer 1;

after the fourth release layer of the substrate adhesive layer 1 in step S8 is removed, the optical adhesive of the substrate adhesive layer 1 is exposed.

And step S52, attaching the second acrylic pressure-sensitive adhesive of the second facestock adhesive layer 3 to the second face of the optical adhesive of the base material adhesive layer 1 to prepare the adhesive.

Bonding the second acrylic pressure-sensitive adhesive of the second facestock adhesive layer 3 with the optical adhesive of the base material adhesive layer 1 to prepare adhesive; the adhesive structure comprises a substrate adhesive layer 1 with a middle layer of 125um, wherein a first surface of the substrate adhesive layer 1 is connected with a first surface material adhesive layer 2 with a thickness of 25um, and a second surface of the substrate adhesive layer 1 is connected with the first surface material adhesive layer 2 with a thickness of 175 um; wherein, first panel glue film 2 of gluing connects first peel ply 4, and second peel ply 5 is connected to first panel glue film 2 of gluing for the three-layer structure of protection gluing, in order to avoid gluing by external force fish tail or damage.

The specific laminating process of the adhesive application laminating display module:

and 101, removing 50um of the second stripping layer 5 of the adhesive with the three-layer structure, attaching the adhesive surface exposed out of the second surface adhesive layer 3 to a cover plate (CG) through a roller, wherein the rolling speed is 100mm/s, and the rolling pressure is 0.1-0.5MPa.

102, removing 100um of a first stripping layer 4 of the adhesive with the three-layer structure, vacuum laminating the exposed adhesive surface of a first surface material adhesive layer 2 on a polaroid through an automatic hard laminating machine, wherein the laminating pressure is 0.1-0.3MPa, the laminating time is 3-5s, and the vacuum degree is 100Pa; and finishing the lamination of the cover plate and the polaroid, namely finishing the lamination of the display module of the electronic product.

And (3) a disassembly returning process:

step 201, placing the bonded structural sample into a defoaming furnace for pressurized defoaming, wherein the defoaming temperature is 35 ℃, the defoaming pressure is 0.4MPa, and the defoaming time is 15min;

and 202, observing the defoamed cover plate and the polaroid, after finding out samples of the cover plate and the polaroid with bubble flaws, placing the samples on a heating platform at 80 ℃, taking 80um copper wires to enter a glue layer of the glued glue, lightly disassembling the glue layer by force for 1 round, and separating the polaroid from the cover plate, wherein an optical glue whole piece is remained on the polaroid, and easily removing the glue from the polaroid by using hands or reworking adhesive tapes and recycling the polaroid. The glue is free from glue fracture in the removing process, the removing time is short, and the reworking efficiency is improved; and the polaroid can be protected to the greatest extent by adopting heating disassembly, so that the service life of the material is prolonged and the material is reused.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (6)

1. A glue, comprising:

a substrate adhesive layer (1), wherein the substrate adhesive layer (1) is an optical pressure-sensitive adhesive layer;

the first surface material adhesive layer (2), the first surface material adhesive layer (2) is attached to the first surface of the base material adhesive layer (1);

and a second surface adhesive layer (3), wherein the second surface adhesive layer (3) is attached to the second surface of the base material adhesive layer (1); wherein the first face and the second face are opposite faces;

the first facestock adhesive layer (2) and the second facestock adhesive layer (3) are both optical pressure-sensitive adhesive layers;

a first release layer (4), the first release layer (4) being glued to the first facestock glue layer (2), the first release layer (4) being located on the opposite side of the facestock glue layer (1);

and the second stripping layer (5) is glued with the second facestock glue layer (3), and the second stripping layer (5) is positioned on the opposite surface of the base material glue layer (1).

2. Glue according to claim 1, characterized in that the thickness of the substrate glue layer (1) is set to 75-125um.

3. Glue according to claim 1, characterized in that the first facestock glue layer (2) is provided with a thickness of 25-50um;

the thickness of the second panel adhesive layer (3) is set to be 25-50um.

4. Glue according to claim 1, characterized in that the adhesion of the substrate glue layer (1) is greater than or equal to 10n/25mm; and

the tensile strength of the substrate adhesive layer (1) is greater than or equal to 1.0MPa.

5. Glue according to claim 1, characterized in that said first facestock layer (2) has a storage modulus of less than 3.0 x 105Pa;

the storage modulus of the second panel adhesive layer (3) is less than 3.0 multiplied by 105Pa.

6. A glue according to claim 1, wherein,

the release force of the first release layer (4) is 5-10 g/25 mm; and/or

The release force of the second release layer (5) is 15-30 g/25 mm.

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