JP3848490B2 - Peeling method and peelable joined body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a peeling method capable of easily delaminating a laminated joined body at an arbitrary time, and a peelable sheet used in the peeling method.
[0002]
[Prior art]
A method of easily peeling the adhesive tape after bonding is disclosed in Japanese Patent Laid-Open No. 3-64381. That is, with an adhesive tape in which an adhesive layer is provided on the surface of a base material made of a synthetic resin film, although the pasting operation is easy, the peeling operation after it becomes unnecessary is difficult. Therefore, in the peeling method described in the above prior art, an adhesive tape in which a foaming agent-containing adhesive layer is provided on the surface of a heat-shrinkable substrate is used.
[0003]
That is, after affixing the said adhesive tape to a to-be-adhered body, in the case of peeling, an adhesive tape is heated. By heating, the heat-shrinkable base material is thermally shrunk, and the foaming agent-containing adhesive layer is foamed, whereby the adhesive tape can be easily peeled from the adherend.
[0004]
[Problems to be solved by the invention]
According to the above prior art, the adhesive tape can be easily peeled off from the adherend simply by heating when it is desired to peel off.
[0005]
However, the adhesive tape tends to cause a so-called adhesive residue in which a part of the adhesive layer remains on the adherend. Therefore, in order to reuse the adherend, it is necessary to remove the adhering adhesive, which complicates complicated operations. In addition, it is necessary to heat at the time of peeling, but when an adhesive tape is affixed to a large area adherend such as a wall material, such a large area adhesive tape is heated uniformly and easily. It was difficult to do.
[0006]
The object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, hardly cause adhesive residue at the time of peeling, easily recycle the adherend, and easily peel even when bonded in a large area. It is in providing the peeling method which can be performed, and the peelable sheet used for this peeling method.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above-mentioned problems, the inventors of the present application use anodization, and peel off at the interface between the anodized electrode and the conductive composition layer in contact with the electrode. It has been found that delamination can be easily performed without causing the rest and the like, and the present invention has been made.
[0008]
That is, the first invention of the present application is a method for delamination of a laminated assembly having at least a structure in which a conductive composition layer is sandwiched between first and second electrodes. A voltage is applied between the electrodes, the anode side electrode is anodized, and peeling is performed at the interface between the electrode and the conductive composition layer.
[0009]
In the first invention, the laminated assembly is delaminated. As the laminated assembly, one having at least a structure in which the conductive composition layer is sandwiched between the first and second electrodes is used. . A voltage is applied between the first and second electrodes, and the anode side electrode is anodized to oxidize the metal constituting the anode side electrode. For this reason, oxidized metal ions diffuse into the conductive composition layer in contact with the electrode, and the metal constituting the anode becomes brittle or disappears. Accordingly, since the adhesive strength between the anode-side electrode and the conductive composition layer is reduced, in the laminated assembly, an adhesive residue is generated at the interface between the anode-side electrode and the conductive composition layer. And can be easily peeled off.
[0010]
2nd invention of this application is a peelable sheet used for the peeling method which concerns on 1st invention, Comprising: The electroconductive composition pinched | interposed between 1st, 2nd electrode and 1st, 2nd electrode and an object layer, by anodizing the electrode of the anode side, the anode side of the electrode, characterized that you have made to weaken or disappear.
[0011]
Preferably, the first and second electrodes have a structure in which a plurality of metal films are stacked. In this case, more preferably, among the plurality of metal films, the metal film laminated on the interface side with the conductive composition layer is made of a metal having a lower standard electrode potential than the other metal films.
[0012]
Details of the present invention will be described below.
In the present invention, the first and second electrodes are made of a material that conducts electricity well when a voltage is applied, and are usually made of metal. The metal constituting the first and second electrodes is not particularly limited. However, in order to promote anodic oxidation, the metal constituting the anode-side electrode has a high ionization tendency, that is, a standard electrode. A metal having a low potential is preferably used. However, if the ionization tendency is too large, the oxidation reaction automatically proceeds due to the reaction activity, the bonding strength between the anode side electrode and the conductive composition layer decreases with time, and the bonding reliability decreases.
[0013]
In the present invention, examples of the metal that constitutes the anode electrode suitably used include Al, Zn, Fe, Ni, Sn, Pb, and Cr.
The metal constituting the cathode side electrode is preferably the same as the metal constituting the anode side electrode. This is because, when electrodes having different standard electrode potentials are brought into contact with each other with a conductive composition layer, a potential is generated between the electrodes, and a metal having a low standard electrode potential is oxidized and corrosion may proceed.
[0014]
In addition, in order to ensure that the electrode and the conductive composition layer are peeled at the interface, the size of the electrode is determined by joining the layer on the back side of the electrode joined via the electrode and the conductive composition layer. It is necessary to be equal to the area or larger than the bonding area.
[0015]
In the present invention, the laminated assembly has at least a structure in which a conductive composition layer is sandwiched between the first and second electrodes, and the anode-side of the first and second electrodes. Peeling is performed at the interface between the electrode and the conductive composition layer. Therefore, in the laminated assembly according to the present invention, the peelable sheet according to the first invention is interposed between the members to be joined, and the members to be joined are joined via the peelable sheet. Or a member to which the first and second electrodes are to be joined.
[0016]
Examples of the structure of the laminated assembly as described above are shown in FIGS.
In the laminated assembly shown in FIG. 1, a peelable sheet 5 in which a conductive composition layer 4 is sandwiched between first and second electrodes 2 and 3 is disposed between adherends 1 and 1. . In the laminated assembly shown in FIG. 1, the outer surfaces of the first and second electrodes 2 and 3 are joined to the adherends 1 and 1 via the adhesive layers 6 and 7.
[0017]
In the laminated assembly shown in FIG. 2, base materials 8 and 9 that support the first and second electrodes 2 and 3 are further laminated on the structure shown in FIG. That is, the electrodes 2 and 3 are respectively formed on one surface of the base materials 8 and 9, and the electrodes 2 and 3 supported by the base materials 8 and 9 are connected to the conductive composition layer 4 side. It is laminated so as to face.
[0018]
In the laminated assembly shown in FIG. 3, the adherend is a metal, and the adherend also serves as the first and second electrodes. That is, the conductive composition layer 11 is laminated between the adherends 10 and 10 made of metal. Thus, in the peeling method according to the present invention, in the laminated assembly, the adherends laminated on both sides of the conductive composition layer may also serve as the first and second electrodes, respectively.
[0019]
In the peeling method according to the present invention, a voltage is applied to the first and second electrodes, the anode-side electrode, for example, the electrode 2 is anodized, and peeling is performed at the interface between the electrode 2 and the conductive composition layer. To do. That is, taking the laminated assembly shown in FIG. 1 as an example, a DC power source is connected between the electrodes 2 and 3 as shown in FIG. Can be anodized.
[0020]
In the present invention, for the first and second electrodes, a metal film is formed on the surface of the conductive composition layer 4 as is apparent from the structural examples of the laminated assemblies shown in FIGS. It may be formed by forming, or may be formed by forming a metal film on one side of the base material, or in the case of an adherend made of metal, the adherend itself may be formed as first and second. It is good also as this electrode.
[0021]
However, as shown in FIG. 2, when a metal film is formed on one side of the substrates 8 and 9 to form an electrode, it is preferable that the electrode has flexibility. Accordingly, it is desirable to use a synthetic resin film having flexibility as the substrate, and a metal thin film is also preferable as the metal film. About a metal thin film, it can form by thin film formation methods, such as direct vapor deposition and sputtering, on a base material. However, the metal film may be configured using a metal foil or the like.
[0022]
Furthermore, in the peelable sheet according to the present invention, the first and second electrodes may have a structure in which a plurality of metal films are laminated. When laminating a plurality of metal films, the metal film laminated on the interface side with the conductive composition is preferably made of a metal having a high ionization tendency, that is, a low standard electrode potential.
[0023]
That is, as shown in FIG. 5, when the electrode 2 is composed of a single metal film, when the anodic oxidation proceeds, a part of the electrode 2 disappears, and a voltage is further applied to the electrode 2. May not be possible. On the other hand, as shown in FIG. 6, the anode-side electrode 2 is configured by laminating metal films 2 a and 2 b on one side of the conductive composition layer 4 in this order, and the conductive composition Such a problem can be solved when the standard electrode potential of the metal film 2a in contact with the layer 4 is lower than the standard electrode potential of the metal film 2b. That is, as shown in FIG. 6, even if the anodic oxidation proceeds and the metal film 2a partially disappears, the metal film 2b remains, so that a voltage is continuously applied between the electrodes 2 and 3. Can do.
[0024]
As the conductive composition layer, an appropriate composition capable of flowing a current so that one electrode can be anodized when a voltage is applied between the electrodes 2 and 3 can be used. Preferably used.
[0025]
It is desirable that the polymer electrolyte itself has an adhesive force or an adhesive force, thereby directly bonding the first and second electrodes and the conductive composition layer. Examples of the polymer electrolyte having such adhesive strength or adhesive strength include acrylic acid, methacrylic acid, itaconic acid, sulfonic acid group-containing monomers, polyamino acid and other polymer salts or copolymer salts with other monomers. A so-called polymer electrolyte can be widely used. Moreover, it is not limited to these polymer salt and copolymer salt, The polymer composition which disperse | distributes electroconductive particle, for example, metal particle, carbon black, polyaniline etc. can also be used.
[0026]
Further, when the conductive composition layer is formed, the method for forming the conductive composition into a sheet is not particularly limited, and a normal sheet forming method or a conductive composition is applied on a support. The method of drying can be used.
[0027]
Furthermore, in addition to the polymer electrolyte, an additive for increasing the adhesive strength and the adhesive strength, an additive for increasing the conductivity, or the like may be added.
Further, a metal film may be directly formed on the surface of the conductive composition layer, whereby the first and second electrodes made of the metal film may be brought into close contact with the conductive composition layer. The conductive composition layer does not have to have adhesive strength or adhesive strength itself.
[0028]
In the peeling method according to the present invention, a voltage is applied between the first and second electrodes of the laminated assembly having at least a structure in which the conductive composition layer is sandwiched between the first and second electrodes, and the anode side By anodizing the electrode, the electrode on the anode side becomes weak or disappears. Therefore, it can peel easily at the interface between the electrode on the anode side and the conductive composition layer. In addition, since a phenomenon called so-called adhesive residue hardly occurs at the time of peeling, the adherend disposed on the back surface of the electrode on the anode side can be easily reused. In addition, since a voltage is applied between the first and second electrodes to facilitate peeling at the interface by anodic oxidation, the interface is surely ensured even when the first and second electrodes have a large area. Peeling can be facilitated.
[0029]
Release sheet according to the present invention, first, a second electrode, first, have a second electrically conductive composition was sandwiched between the electrode layers, by the anode electrode anodizing since the anode side of the electrode Ruru been made to weakening or disappearance, by using the peeling method according to the present invention, it can be easily peeled off without causing glue remaining from the adherend.
[0030]
Further, the first and second electrodes have a structure in which a plurality of metal films are laminated, and the metal film laminated on the interface side with the conductive composition layer in the anode side electrode is another metal film. In the case where the electrode is made of a metal having a lower standard electrode potential, as described above, the voltage can be reliably applied even when the anodic oxidation proceeds.
[0031]
【Example】
Hereinafter, the present invention will be described in detail by giving non-limiting examples of the present invention.
[0032]
Example 1
The following components were weighed to obtain a solution for producing a polymer electrolyte.
4-hydroxybutyl acrylate 130 parts by weight Acrylic acid 70 parts by weight Glycerin 30 parts by weight Water 19 parts by weight Potassium hydroxide 19 parts by weight Aerosil 3 parts by weight Triethylene-bis-methacrylate 0.35 parts by weight Benzyl methyl ketal 0.35 parts by weight The solution prepared as described above is applied by bar coating so as to have a thickness of about 300 μm, and is irradiated with ultraviolet rays under conditions of 40 mW and 5 minutes with an ultra-high pressure mercury lamp, and ultraviolet polymerization is carried out. A conductive composition layer made of an electrolyte sheet was formed.
[0033]
Next, two polyethylene terephthalate (PET) films in which a Cr film and a Zn film were sequentially laminated on one side were prepared. Then, on both sides of the polymer electrolyte sheet obtained as described above, Tei Ru surface of the PET film laminated metal film is formed laminated such that the inside to prepare a release sheet.
[0034]
In the peelable sheet obtained as described above, the first and second electrodes are formed by the laminated metal film, and the conductive composition comprising the polymer electrolyte sheet between the first and second electrodes. Layers are configured. The first and second electrodes are in contact with the conductive composition layer on the Zn film side.
[0035]
The prepared peelable sheet has a size of 10 cm × 10 cm × thickness 0.5 mm, and the first and second electrodes cover the entire upper and lower surfaces of the conductive composition layer.
[0036]
A DC voltage of 50 V was applied for 1 minute between the first and second electrodes of the peelable sheet obtained as described above so that the first electrode was on the anode side. Thereafter, the film was peeled off at the interface between the first electrode and the conductive composition layer, and the 180 ° peel strength was measured according to the 8.3 180 ° C. peeling strength measurement method of JIS Z0237.
[0037]
Moreover, 180 degree peeling strength was similarly measured about the said peelable sheet before the said voltage application.
As a result, the 180 ° peel strength was 2 kg / cm before the voltage application, whereas it decreased to 0.1 kg / cm after the voltage application.
[0038]
Therefore, it can be seen that the first electrode can be easily peeled off at the interface between the first electrode and the conductive composition layer by anodic oxidation of the first electrode. Moreover, when the peeling surface when peeling was applied after voltage application was observed, peeling occurred at the interface between the first electrode and the conductive composition layer, and the peeling surface, that is, the first electrode was laminated. No adhesive residue was observed on the side of the PET film that had been present.
[0039]
【The invention's effect】
As described above, in the peeling method according to the present invention, voltage is applied between the first and second electrodes, the electrode on the anode side is anodized, and peeling is performed at the interface between the electrode and the conductive composition layer. Therefore, the laminated assembly can be peeled off at any time by applying a voltage. Moreover, peeling is facilitated by applying a voltage, and heating is not required. Therefore, even a large-area laminated assembly can be easily peeled off.
[0040]
Moreover, since the adhesive residue hardly occurs on the peeled surface, the peeled member can be easily reused.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a laminated assembly used in a peeling method according to the present invention.
FIG. 2 is a cross-sectional view showing another example of a laminated assembly used in the peeling method according to the present invention.
FIG. 3 is a cross-sectional view showing still another example of the laminated assembly used in the peeling method according to the present invention.
4 is a cross-sectional view for explaining a method of applying a voltage between the first and second electrodes of the multilayer joined body shown in FIG.
FIG. 5 is a cross-sectional view for explaining the progress of anodic oxidation when the first and second electrodes are made of a single metal film. FIG. 6 is a diagram showing that the first and second electrodes are composed of laminated metal films. Sectional view for explaining the progress of anodization when it is done [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Adhered body 2, 3 ... 1st, 2nd electrode 2a, 2b ... Metal film 4 ... Conductive composition layer 5 ... Releaseable sheet 6, 7 ... Adhesive layer 8, 9 ... Base material 10,10 ... Adhered body 11 also serving as first and second electrodes ... Conductive composition layer

Claims (4)

A method of delaminating a laminated assembly having at least a structure in which a conductive composition layer is sandwiched between first and second electrodes,
A peeling method characterized by applying a voltage between the first and second electrodes, anodizing the electrode on the anode side, and peeling at the interface between the electrode and the conductive composition layer. A peelable sheet used in the peeling method according to claim 1,
First and second electrodes;
First, and a second inter-electrode sandwiched between the conductive composition layer, by electrodes anodizing the anode side, that the anode side of the electrode has been made to weaken or disappear A peelable sheet characterized by that.   The peelable sheet according to claim 2, wherein the first and second electrodes have a structure in which a plurality of metal films are laminated.   The peeling according to claim 3, wherein the metal film laminated on the interface side with the conductive composition layer among the plurality of metal films is made of a metal having a standard electrode potential lower than that of the other metal films. Sex sheet.

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