KR102361820B1 - Secondary battery fixing tape of detachment type by water permeance through osmotic pressure and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a tape and a method for manufacturing the same, and more particularly, when replacement is required due to abnormal occurrence or long-term use of secondary batteries applied to mobile devices, tablets, etc. When the battery is separated from the device, moisture permeates the tape in an osmotic pressure method to rapidly lower the physical peel force, so that the secondary battery can be easily separated. It relates to a manufacturing method.
To this end, the present invention, a first pressure-sensitive adhesive layer; and a release paper attached to at least one surface of both surfaces of the first pressure-sensitive adhesive layer, and when the release paper is attached to only one surface of the first pressure-sensitive adhesive layer, a base film is disposed on the other surface of the first pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive on the base film A layer is formed, a release film is attached to the second pressure-sensitive adhesive layer, and a channel space for moisture movement is formed on the first pressure-sensitive adhesive layer on the pressure-sensitive adhesive surface. It is characterized in that the adhesion of the interface is reduced by promoting it.

Description

Osmotic pressure water injection peelable secondary battery fixing tape and manufacturing method thereof

The present invention relates to a tape and a method for manufacturing the same, and more particularly, when replacement is required due to abnormal occurrence or long-term use of secondary batteries applied to mobile devices, tablets, etc. When the battery is separated from the device, moisture permeates the tape in an osmotic pressure method to rapidly lower the physical peel force, so that the secondary battery can be easily separated. It relates to a manufacturing method.

Recently, with the rapid development of information and communication fields and semiconductor fields, portable computer devices such as smart phones and tablet PCs have also become popular. Accordingly, secondary batteries are mainly used as power sources for the devices.

Rechargeable batteries are also called rechargeable batteries in the sense that they can be recharged multiple times by converting external electrical energy into chemical energy, storing it, and generating electricity when needed. , nickel-metal hydride batteries (Ni-MH), lithium ion batteries (Li-ion), lithium ion polymer batteries (Li-ion polymer), and the like.

However, double-sided tape is used depending on the type of secondary battery to fix the secondary battery to various devices and devices. In the process of applying strong power to the battery, there is a problem that causes physical injury to workers, fires and explosions due to damage to the secondary battery.

On the other hand, according to the structure in which the handle is applied to the rubber tape to solve the problem when replacing the secondary battery as described above, the tape is stretched and peeled by pulling the handle, but the tape is cut off when pulling as strong peeling force is required There is a limit to adjusting the thickness of the tape in order to prevent the phenomenon.

Republic of Korea Patent Publication No. 10-1711696 Republic of Korea Patent Publication No. 10-1706293

The present invention has been devised to solve the problems of the prior art, and in a situation in which replacement is required due to abnormal occurrence or long-term use of secondary batteries used in various devices such as mobiles and tablets, it is firmly fixed by tape. When the secondary battery needs to be separated from the device, moisture moves to the adhesive side of the tape according to the osmotic pressure method, thereby rapidly lowering the physical peel force, resulting in a simple secondary battery separation. An object of the present invention is to provide a tape for use and a method for manufacturing the same.

In order to achieve the above object, the present invention, a first pressure-sensitive adhesive layer; and a release paper attached to at least one surface of both surfaces of the first pressure-sensitive adhesive layer, and when the release paper is attached to only one surface of the first pressure-sensitive adhesive layer, a base film is disposed on the other surface of the first pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive on the base film A layer is formed, a release film is attached to the second pressure-sensitive adhesive layer, and a channel space for moisture movement is formed on the first pressure-sensitive adhesive layer on the pressure-sensitive adhesive surface. It is characterized in that the adhesion of the interface is reduced by promoting it.

Here, the second pressure-sensitive adhesive layer is characterized in that, in the same way as the first pressure-sensitive adhesive layer, moisture moves to the adhesive surface upon contact with moisture, thereby reducing the adhesive force of the adhesive interface.

In addition, at least one or more of the first and second pressure-sensitive adhesive layers are made of acrylic, urethane, silicone, natural rubber-based or synthetic rubber-based materials, and emulsion or water-soluble adhesives are used for dispersion and surface arrangement of surfactants, When an emulsion adhesive is used as a material, the surfactant is primarily added at a level with no change in properties as an emulsifier for emulsion polymerization of the emulsion adhesive, and is added secondarily in a post-addition method after emulsion polymerization when tape is manufactured. do.

Here, the primary input amount of the surfactant during emulsion polymerization of the emulsion adhesive is 0 to 10 parts by weight based on 100 parts by weight of the emulsion adhesive having a 50% solid content, and the secondary input amount added after preparing the tape is 50% solids emulsion adhesive 100 It is characterized in that it is 1 to 25 parts by weight based on parts by weight.

In addition, at least one of the release paper and the release film is formed with a channel through which moisture moves, and the channel is transferred onto the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer, and the first and second pressure-sensitive adhesive layers in a different manner. At least one of them is characterized in that it is arranged at regular intervals on the base film to form a space through which moisture moves.

On the other hand, the present invention, the pressure-sensitive adhesive layer forming step of forming the first and second pressure-sensitive adhesive layer on both sides of the base film, respectively; and a channel transfer step of transferring the channel by attaching at least any one or more of the release paper and the release film having a channel to which moisture is transferred to the first and second pressure-sensitive adhesive layers.

On the other hand, a moisture movement space forming step of disposing at least one of the first and second pressure-sensitive adhesive layers on the base film at regular intervals so as to form a space in which the moisture moves; and a release paper attaching step of attaching a release paper and a release film to each of the first and second pressure-sensitive adhesive layers.

As described above, the osmotic pressure-type moisture input peelable secondary battery fixing tape and the manufacturing method thereof according to the present invention can exhibit the following effects.

1. The strong peeling force can be easily removed by water treatment when removing the secondary battery fixed with tape in various devices.

2. There is no need to apply large force with tools or hands, so injury to the body or damage to the secondary battery can be prevented in the process of replacing the secondary battery.

3. When replacing the secondary battery, it is possible to prevent the risk of fire due to damage or pollution of the environment due to the leakage of harmful substances.

1a to 1c are views showing an embodiment of the structure of the tape for fixing the osmotic moisture input peelable secondary battery according to the present invention;
2 is a view schematically showing an example of a secondary battery and a tape shape according to the present invention to be attached thereto;
3 is a view exemplarily showing the state of movement of moisture on the pressure-sensitive adhesive layer of the tape according to the present invention;
4 is a view showing an example of a secondary battery coupled to each other by a tape and an adherend removal method according to the present invention;
5 is a view showing an adhesion test method applied to the test of the present invention

The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical spirit of the present invention, so they can be substituted at the time of the present application It should be understood that various equivalents and modifications may exist.

Hereinafter, with reference to the drawings, an osmotic moisture input peelable secondary battery fixing tape and a manufacturing method thereof according to the present invention will be described.

1A to 1C are diagrams showing an embodiment of a structure of a tape for fixing an osmotic pressure type moisture input peelable secondary battery according to the present invention, and FIG. 2 schematically shows an example of a secondary battery and a tape shape according to the present invention to be attached thereto 3 is a view exemplarily showing the state of movement of moisture on the pressure-sensitive adhesive layer of the tape according to the present invention.

The present invention is basically configured to include a first pressure-sensitive adhesive layer and a release paper.

More specifically, the present invention relates to a first adhesive layer in which a space for moisture movement is formed on an adhesive surface and moisture moves to an adhesive interface when in contact with moisture to reduce adhesive strength, and a release paper attached to at least one side of both surfaces of the first adhesive layer It has a form in which the release paper protects the first pressure-sensitive adhesive layer including As this is promoted, the adhesive force of the interface is reduced, and the structure in which the release paper is attached to both surfaces based on the first adhesive layer as described above is shown in FIG. 1A.

In addition, in the present invention, when a release paper is attached to only one surface of the first pressure-sensitive adhesive layer, a base film is disposed on the other surface of the first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer is formed on the base film, and a release film is attached to the second pressure-sensitive adhesive layer In this case, the space for moisture movement is applied only to the first adhesive layer and the second adhesive layer functions as a general adhesive layer, as in FIG. The layer may also have a structure in which moisture is transferred to the adhesive surface upon contact with moisture through the moisture movement space, similarly to the first adhesive layer, so that the adhesive force of the adhesive interface is reduced.

The base film is made of PET (Polyethylene Terephthalate), PP (Polypropylene) , PI (Polyimide), PE (Polyethylene), PU (Polyurethane), etc. as a material to form first and second adhesive layers on both sides.

In addition, in the first and second pressure-sensitive adhesive layers, a surfactant is added in a post-attached manner to have a characteristic that water moves when in contact with water, and moisture moves to the interface between the pressure-sensitive adhesive layer of the adhesive interface and the adherend to reduce adhesive strength. It is preferable to use acrylic, urethane, silicone, natural rubber, or synthetic rubber as a material, or to use an emulsion or a water-soluble adhesive as a material to improve dispersion and surface arrangement of surfactants.

When the first and second pressure-sensitive adhesive layers are made of an emulsion pressure-sensitive adhesive, the surfactant is primarily added as an emulsifier for emulsion polymerization of the emulsion pressure-sensitive adhesive at a level without change in properties, and is secondarily added after emulsion polymerization In other words, in addition to the basic input amount during emulsion polymerization of the emulsion pressure-sensitive adhesive, a surfactant is separately added immediately before the pressure-sensitive adhesive coating operation. As a result, through the secondary addition of surfactant, moisture smoothly moves to the adhesive interface upon contact with moisture, thereby providing a function in which the adhesive strength of the adhesive layer is lost.

Here, the primary input amount of the surfactant during emulsion polymerization of the emulsion adhesive is 0 to 10 parts by weight based on 100 parts by weight of the emulsion adhesive having a 50% solid content, and the secondary input amount added after preparing the tape is 50% solids emulsion adhesive 100 By setting it as 1 to 25 parts by weight based on parts by weight, it is possible not to interfere with the emulsion polymerization and physical properties of the emulsion pressure-sensitive adhesive, and at the same time to allow moisture to easily move to the interface between the pressure-sensitive adhesive layer and the adherend.

The release paper and the release film are attached to protect the first and second adhesive layers, and materials such as silicone, fluorine, and wax (WAX) may be applied so that they can be easily separated from the adhesive layer.

In addition, the release paper and the release film may have a channel for selectively or collectively moving moisture, that is, a channel for forming a space for moisture movement, and the channel may be formed by using the release paper or the release film as the first pressure-sensitive adhesive layer or the second adhesive layer. 2 After being attached to the pressure-sensitive adhesive layer, it is transferred to each pressure-sensitive adhesive layer.

As described above, in addition to the method of transferring the channel to the pressure-sensitive adhesive layer through the channel-formed release paper and the release film to form a space for moisture movement, each adhesive is coated with a base film to form a space for moisture movement in the first and second adhesive layers. By arranging at regular intervals on the top, it may be possible to secure a space for moisture movement.

On the other hand, the method for manufacturing a tape for fixing an osmotic moisture input peelable secondary battery according to the present invention comprises a pressure-sensitive adhesive layer forming step of forming first and second pressure-sensitive adhesive layers on both sides of a base film, respectively, and a channel through which moisture is transferred. A channel transfer step of transferring the channel by attaching the formed release paper and release film on the first and second pressure-sensitive adhesive layers, or each of the first and second pressure-sensitive adhesive layers on the base film to form a space for moisture movement It may include a step of forming a moisture movement space for partitioning and disposing at regular intervals, and a step of attaching a release paper for attaching a release paper and a release film to each of the first and second pressure-sensitive adhesive layers.

Hereinafter, an example of a process for removing a secondary battery to which the tape according to the present invention is applied will be described.

4 is a view showing an example of a process of removing a secondary battery and an adherend coupled to each other by a tape according to the present invention.

1) When moisture comes into contact with one side of a rectangular secondary battery, a tape is attached to reduce the adhesive strength of the adhesive interface as moisture moves to the adhesive side (attach the secondary battery to the first adhesive layer)

2) Attach the secondary battery to the adherend surface of the object to be fixed (Attach the second adhesive layer to the adherend surface)

3) Drop a few drops of water on the side of the secondary battery using a dropper

4) Dropped water droplets spread throughout the tape along the channel or space formed in the first adhesive layer

5) As the water spread throughout the body moves to the interface between the adhesive layer and the object, the adhesive force of the tape is rapidly reduced, making the secondary battery easy to remove.

For reference, the first and second pressure-sensitive adhesive layers according to the present invention have a characteristic of losing overall adhesive strength as water moves to the interface when in direct contact with water, and when exposed to humidity of 95% or less without direct contact, secondary The holding power of the battery can be maintained.

Hereinafter, the performance of the tape according to the present invention will be looked at through Examples and Test Examples.

<First embodiment>

Separately, surfactants are added by content to the 50% solids acrylic emulsion adhesive (which has a 180 degree peel adhesive strength of 1700gf/25mm when formed at a thickness of 25um on the cross-section of a 25um PET film and selected as Ball Tack No. 3 adhesive). The mixed adhesive is coated on one side of a PET base film, dried at 130°C, and an adhesive layer is formed to a thickness of 25um. Upon input, a channel through which moisture can penetrate by osmotic pressure is formed in the pressure-sensitive adhesive.

A 20 μm solvent-type acrylic adhesive layer is formed on the other side of the PET base film and a PET release film is attached thereto. The acrylic adhesive applied at this time had a 180 degree peel adhesive force of 2000gf/25mm when formed to a thickness of 25um on the cross section of a 25um PET film, and was selected as Ball Tack No.2 adhesive.

[Comparative Example 1] Solvent type acrylic adhesive used alone

[Comparative Example 2] Acrylic emulsion adhesive alone

[Example 1] 1% of surfactant was added to the acrylic emulsion adhesive

[Example 2] 2% of surfactant was added to the acrylic emulsion adhesive

[Example 3] 3% of surfactant was added to the acrylic emulsion adhesive

[Example 4] 4% of surfactant was added to the acrylic emulsion adhesive

[Example 5] 5% of surfactant was added to the acrylic emulsion adhesive

[Example 6] 6% of surfactant was added to the acrylic emulsion adhesive

[Example 7] 7% of surfactant was added to the acrylic emulsion adhesive

[Example 8] 8% of surfactant was added to the acrylic emulsion adhesive

[Example 9] 9% of surfactant was added to the acrylic emulsion adhesive

[Example 10] 10% of surfactant was added to the acrylic emulsion adhesive

<Example 1>

After attaching the solvent-type acrylic adhesive layer of the prepared tape to a PET film of 75 μm, cut it into a width of 100 mm * 25 mm and attach it to an adherend (SUS plate, glass plate, aluminum plate, etc.), and then measure the adhesion after 20 minutes.

In addition, it is left at room temperature (23℃, 50% R.H.) for 24 hours in an attached state.

Drop water on the edge of the left sample with a dropper and leave it for 20 minutes to allow moisture to penetrate to the side, then measure the adhesive force at 180 degrees to check the change in peeling force.

division Adhesion after 20 minutes (SUS plate) After attaching, store at room temperature for 24 hours, and after 20 minutes of moisture penetration, adhesive strength SUS plate glass plate aluminum plate Comparative Example 1 1734 1942 1837 1941 Comparative Example 2 1592 1516 1503 1598 Example 1 1551 641 532 513 Example 2 1488 167 124 118 Example 3 1480 89 81 79 Example 4 1457 54 49 51 Example 5 1382 48 42 42 Example 6 1266 46 45 48 Example 7 1035 32 36 29 Example 8 899 28 21 25 Example 9 871 26 22 26 Example 10 729 28 24 21

Referring to Table 1, in the case of the solvent-type acrylic pressure-sensitive adhesive and the acrylic emulsion pressure-sensitive adhesive without the subsequent addition of a surfactant, a decrease in adhesive strength was not observed after water penetration.

In the case of additionally adding the surfactant after addition, a decrease in adhesive strength is observed from 1% added, and a significant decrease in adhesive strength occurs to the extent that separation can be easily performed at an additional 2% or more.

Up to 6% of the added surfactant content, the adhesive strength for attachment maintains a level of about 80% compared to the initial adhesive strength, showing a stable state.

In the case of Test Example, it can be confirmed that it is appropriate to adjust the use of the surfactant within the range of 2 to 6% for the acrylic emulsion adhesive having a solid content of 50%.

The appropriate amount may vary depending on the solid content of the acrylic emulsion pressure-sensitive adhesive and the amount of surfactant added during basic polymerization, and it varies depending on the content and type of the hydrophilic group of the surfactant.

<Second embodiment>

Separately add 5% of surfactant to the 50% solids acrylic emulsion adhesive (the adhesive has a 180 degree peel adhesive strength of 1700gf/25mm when formed at a thickness of 25um on the cross section of 25um PET film and selected as Ball Tack No.3 adhesive) After coating the mixed adhesive on one side of the PET base film, it is dried at 130° C. to form an adhesive layer with a thickness of 25 μm.

Then, by attaching an embossing liner that adjusts the channel width and channel spacing, when water is added to the side of the product, a channel through which moisture can penetrate by osmotic pressure is formed in the adhesive.

On the other side of the PET base film, a 20 μm solvent-type acrylic adhesive layer is formed and a PET release film is attached. The acrylic adhesive applied at this time had a 180 degree peel adhesive force of 2000gf/25mm when formed to a thickness of 25um on the cross section of a 25um PET film, and was selected as Ball Tack No.2 adhesive.

[Example 11] Channel width 50um, channel spacing 250um

[Example 12] Channel width 50um, channel spacing 500um

[Example 13] Channel width 100um, channel spacing 250um

[Example 14] Channel width 100um, channel spacing 500um

[Example 15] Channel width 150um, channel spacing 250um

[Example 16] Channel width 150um, channel spacing 500um

<Second test example>

After attaching the solvent-type acrylic adhesive layer of the produced tape to a 25mm * 25mm aluminum plate, attach the acrylic emulsion adhesive layer to the SUS plate and leave it for 24 hours at room temperature (23℃) for 24 hours, then fix the SUS plate and aluminum A pulling force of 500 g is applied to the plate in the vertical direction (see FIG. 5).

After that, water is dropped on the side of the acrylic emulsion adhesive layer attached to the SUS plate with a dropper to allow moisture to penetrate, and then the separation time between the SUS plate and the acrylic emulsion adhesive layer is measured.

division Desorption time (sec) Example 11 226 Example 12 342 Example 13 167 Example 14 234 Example 15 123 Example 16 169

Referring to Table 2, there is a difference in the peeling speed according to the standard of the channel formed in the acrylic emulsion adhesive layer. The wider the channel, the easier moisture permeates and quick peeling is possible. It can be confirmed that rapid penetration is possible and rapid peeling is achieved.

In the above description of the present invention with reference to the accompanying drawings, a specific shape and direction have been mainly described, but the present invention can be variously modified and changed by those skilled in the art, and these modifications and changes are included in the scope of the present invention. should be interpreted as

Claims (10)

a first pressure-sensitive adhesive layer;
and a release paper attached to at least one surface of both surfaces of the first pressure-sensitive adhesive layer;
When a release paper is attached to only one surface of the first pressure-sensitive adhesive layer, a base film is disposed on the other surface of the first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer is formed on the base film, and a release film is attached to the second pressure-sensitive adhesive layer,
In the first adhesive layer, a channel space for moisture movement is formed on the adhesive surface, and moisture movement is promoted to the adhesive interface by the hydrophilic property of the surfactant when in contact with moisture, thereby reducing the adhesive force of the interface,
The first pressure-sensitive adhesive layer is made of an acrylic emulsion pressure-sensitive adhesive for dispersion and surface arrangement of the surfactant,
In the case of emulsion polymerization of the acrylic emulsion adhesive, the primary amount of the surfactant is 2-6 parts by weight based on 100 parts by weight of the acrylic emulsion adhesive based on 50% solids, and the secondary input amount added after preparing the tape is the acrylic emulsion adhesive based on 50% solids It is 2 to 6 parts by weight based on 100 parts by weight,
The first input amount and the second input amount are osmotic pressure water injection peelable secondary battery fixing tape, characterized in that the same.
The method according to claim 1,
The second pressure-sensitive adhesive layer is the same as the first pressure-sensitive adhesive layer, moisture moves to the adhesive surface when in contact with moisture, so that the adhesive strength of the adhesive interface is reduced.
The method according to claim 1,
At least one of the first and second pressure-sensitive adhesive layers is an osmotic pressure-type moisture input peelable secondary battery fixing tape, characterized in that it is made of acrylic, urethane, silicone, natural rubber-based or synthetic rubber-based material.
delete delete delete The method according to claim 1,
A channel is formed in at least one of the release paper and the release film to allow the movement of moisture while controlling the movement speed of moisture by osmotic pressure according to the width and spacing, and the channel is on the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer Osmotic pressure water input peelable secondary battery fixing tape, characterized in that transferred to.
The method according to claim 1,
At least one of the first and second pressure-sensitive adhesive layers is an osmotic pressure-type moisture input peelable secondary battery fixing tape, characterized in that it is arranged at regular intervals on the base film to form a space through which moisture moves.
In the manufacturing method of the tape according to claim 1,
a pressure-sensitive adhesive layer forming step of forming first and second pressure-sensitive adhesive layers on both surfaces of the base film, respectively;
A channel transfer step of transferring the channel by attaching at least any one or more of the release paper and the release film having a channel to which moisture is transferred to the first and second pressure-sensitive adhesive layers to be transferred;
The first and second pressure-sensitive adhesive layers are made of an acrylic emulsion pressure-sensitive adhesive for dispersion and surface arrangement of the surfactant,
In the case of emulsion polymerization of the acrylic emulsion adhesive, the primary amount of the surfactant is 2-6 parts by weight based on 100 parts by weight of the acrylic emulsion adhesive based on 50% solids, and the secondary input amount added after preparing the tape is the acrylic emulsion adhesive based on 50% solids It is 2 to 6 parts by weight based on 100 parts by weight,
The first input amount and the second input amount are the same as each other, characterized in that the osmotic pressure method for producing a water-injection peelable secondary battery fixing tape.
In the manufacturing method of the tape according to claim 1,
a water movement space forming step of disposing at least one of the first and second pressure-sensitive adhesive layers at regular intervals on the base film to form a space through which water moves;
A release paper attaching step of attaching a release paper and a release film to each of the first and second pressure-sensitive adhesive layers;
The first and second pressure-sensitive adhesive layers are made of an acrylic emulsion pressure-sensitive adhesive for dispersion and surface arrangement of the surfactant,
In the case of emulsion polymerization of the acrylic emulsion adhesive, the primary amount of the surfactant is 2-6 parts by weight based on 100 parts by weight of the acrylic emulsion adhesive based on 50% solids, and the secondary input amount added after preparing the tape is the acrylic emulsion adhesive based on 50% solids It is 2 to 6 parts by weight based on 100 parts by weight,
The first input amount and the second input amount are the same as each other, characterized in that the osmotic pressure method for producing a water-injection peelable secondary battery fixing tape.

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