Electrically-visbreaking pressure-sensitive adhesive, adhesive tape and preparation method and application of electrically-visbreaking pressure-sensitive adhesive

Abstract

The invention discloses an electric visbreaking pressure-sensitive adhesive, an adhesive tape and a preparation method and application thereof, and belongs to the technical field of controllable detachable pressure-sensitive adhesive materials. According to the pressure-sensitive adhesive, an acrylate copolymer is used as a matrix, an acrylate monomer containing a redox group, a flexible macromonomer, a solid polymer electrolyte phase and high-dielectric inorganic particles are introduced, and an electric visbreaking pressure-sensitive adhesive layer is formed through cross-linking curing; the adhesive layer, the comb tooth electrode layer and the electric insulation isolation layer are combined to form the electric visbreaking adhesive tape, under the action of a direct-current electric field, through cooperative regulation and control of an ionic conductive phase and a redox center, the peel strength of an adhesive interface is remarkably reduced, meanwhile, the adhesive performance in a power-off state and the stable visbreaking effect of multiple on-off cycles are kept, and the service life of the adhesive tape is prolonged. The method is suitable for electronic assembly and maintainable connection scenes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of controllable detachable pressure sensitive adhesive material, and particularly relates to an electrically debondable pressure sensitive adhesive, an adhesive tape, and a preparation method and application thereof. BACKGROUND

[0002] Pressure sensitive adhesive and adhesive tape can realize rapid bonding and positioning at room temperature, and are suitable for various substrates such as metal, plastic, glass and coated surfaces, and thus are widely used in the fields of electronic device assembly, display module bonding, label identification, temporary fixing and transportation protection. With the evolution of precision manufacturing towards miniaturization, modularization and maintainability, the bonding material not only needs to provide stable connection function, but also needs to adapt to the process requirements such as repair disassembly, repeated positioning and material recycling, so as to realize the controllability and consistency of the bonding state under different working conditions, to meet the needs of large-scale processing and multi-scene application.

[0003] In the prior art, in order to realize controllable debonding or debonding effect, the following technical routes are mainly formed: the first type is to introduce a photocurable prepolymer, a photoinitiating system or a light-responsive component based on an acrylate pressure sensitive adhesive, to change the curing degree or the interface state of the adhesive layer by external light irradiation, and then to adjust the bonding behavior; the second type is to combine the adhesive layer with a conductive layer, an electrode structure or a device layer, to change the adhesive layer or the interface state by the electric field, the thermal effect or the light emission process generated by the power-on, and to realize the peeling control; the third type is to construct an ion conductive phase or a conductive network, for example, to form a charge transmission path by using a hydrogel system, an ionic salt system or a conductive filler system, to realize the power-on response.

[0004] Although the above routes provide various implementation ways for controllable peeling, there are still the following problems in actual application: poor compatibility of components and matrix may cause unstable dispersion; the introduction of conductive or ionic phase may disturb the normal bonding performance window; the change of environmental temperature and humidity is easy to cause the fluctuation of response behavior; the multi-layer composite structure increases the complexity of preparation process and the difficulty of interlayer consistency control. These problems may affect the stability, repeatability and consistency of batch production of bonding performance.

[0005] Therefore, it is necessary to develop a pressure sensitive adhesive and adhesive tape scheme which is more suitable for large-scale preparation, has more stable response characteristics, and is easy to integrate with an electrode structure, on the basis of the existing controllable debonding material and structure scheme, in view of the process adaptability and long-term use stability requirements in the detachable bonding scene, so as to meet the comprehensive requirements of reliable bonding and controllable peeling performance in the fields of electronic manufacturing, precision assembly and maintainable connection. SUMMARY

[0006] The purpose of this invention is to address the problems existing in the background art by providing an electro-tack reducing pressure-sensitive adhesive, adhesive tape, its preparation method, and application scheme. To achieve the above objective, the technical solution proposed by this invention is as follows: On one hand, this invention provides an electro-tack reducing pressure-sensitive adhesive, comprising, by solid weight parts: 100 parts of acrylate copolymer matrix, 2-25 parts of flexible macromolecular monomer, 5-40 parts of solid polymer electrolyte phase, 1-25 parts of high-dielectric inorganic particles, and 0.2-8 parts of crosslinking agent; wherein: the acrylate... The ester copolymer matrix is ​​obtained by free radical copolymerization of soft monomers, hard monomers, functional monomers and acrylate monomers containing redox groups. The acrylate monomers containing redox groups have a mass fraction of 0.2% to 12% in the total monomers and contain ferrocene groups or bipyridinium groups. The flexible macromolecular monomer contains at least one free radical copolymerizable acrylate group or methacrylate group, and the main chain is a polysiloxane segment or a hydrogenated polydiene segment. The outer surface of the high dielectric inorganic particles is coated with an inorganic dielectric shell.

[0007] Further, based on 100 parts by weight of the total monomers of the acrylate copolymer matrix, the soft monomer is an alkyl methacrylate with 4 to 12 alkyl carbon atoms, and the amount used is 50 to 85 parts by weight; the hard monomer is methyl methacrylate or styrene, and the amount used is 5 to 30 parts by weight; the functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, glycidyl methacrylate, acrylic acid and methacrylic acid, and the amount used is 1 to 20 parts by weight.

[0008] Further, the acrylate monomer containing the redox group is selected from one or more of ferrocene methyl methacrylate, ferrocene methyl methacrylate, and 4,4'-bipyridinium salt methacrylate; wherein, the anion of the bipyridinium salt in the 4,4'-bipyridinium salt methacrylate is selected from tetrafluoroborate. hexafluorophosphate and bis(trifluoromethanesulfonyl)imide One or more of them.

[0009] Further, the solid polymer electrolyte phase comprises: 2-30 parts by weight of an acrylate polymer or copolymer containing polyether side chains, and 0.5-15 parts by weight of an electrolyte salt; the electrolyte salt is a lithium salt, selected from one or more of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium hexafluorophosphate (LiPF6), and lithium tetrafluoroborate (LiBF4); the molar ratio of ether oxygen atoms to lithium ions in the polyether side chains is 5:1 to 30:1.

[0010] Furthermore, the high-dielectric inorganic particles are selected from one or more of barium titanate (BaTiO3), strontium titanate (SrTiO3), lead zirconate titanate (PZT), and lithium niobate (LiNbO3), with a particle size distribution D50 of 0.05~3μm; the inorganic dielectric shell is selected from one or more of silicon dioxide (SiO2), aluminum oxide (Al2O3), and silicon nitride (Si3N4), with a shell thickness of 5~300nm.

[0011] On the other hand, the present invention provides an electro-tack reducing adhesive tape made using the above-mentioned electro-tack reducing pressure-sensitive adhesive, comprising a substrate layer, a comb electrode layer, an electrically insulating isolation layer, an electro-tack reducing pressure-sensitive adhesive layer, and a conventional pressure-sensitive adhesive layer located on the back side of the substrate, which are stacked sequentially; the conventional pressure-sensitive adhesive layer located on the back side of the substrate can be an acrylic or rubber-based pressure-sensitive adhesive, with a dry film thickness generally of 20~80μm, and a peelable release layer can be laminated on its outer side as needed, wherein: The comb electrode layer includes a first comb electrode and a second comb electrode that are insulated from each other. The finger width of the first comb electrode and the second comb electrode is 20~500μm, and the finger spacing is 20~500μm. The comb electrode has an interdigitated structure, that is, the first comb electrode and the second comb electrode each form multiple parallel finger-shaped electrode teeth. The electrode teeth are interwoven along the width direction of the tape, with insulating gaps in between, and are arranged in an interdigitated manner. The thickness of the electrical insulating layer is 1~30μm, and the dielectric constant is 3~30 under 1kHz conditions; The thickness of the electro-tack reducing pressure-sensitive adhesive layer is 20~300μm, and it is obtained by coating the electro-tack reducing pressure-sensitive adhesive and drying and curing it into a film.

[0012] Furthermore, the electro-tack reducing pressure-sensitive adhesive layer includes a first sub-layer and a second sub-layer disposed adjacent to each other along the thickness direction; the first sub-layer is close to the electrical insulating isolation layer, and the weight ratio of the solid polymer electrolyte phase in the first sub-layer to the solid polymer electrolyte phase in the second sub-layer is (1.5~10):1; the thickness of the first sub-layer is 2~30μm, and the thickness of the second sub-layer is 10~270μm.

[0013] Furthermore, the electrical insulating layer is one or more of acrylate insulating coating, polyurethane insulating coating, polyimide insulating coating, and silicon-containing inorganic oxide insulating coating, and the volume resistivity of the electrical insulating layer is 10. 7 ~10 12 Ω·m.

[0014] In another aspect, the present invention provides a method for preparing the above-mentioned electro-tack reducing pressure-sensitive adhesive, comprising the following steps: S1. Soft monomers, hard monomers, functional monomers, acrylate monomers containing redox groups and flexible macromolecular monomers are added to an organic solvent, and after passing an inert gas through, free radical solution polymerization is carried out at 50~90°C to obtain an acrylate copolymer solution containing the acrylate copolymer matrix. S2. Add a solid polymer electrolyte phase to the acrylate copolymer solution and mix to obtain a first mixed system; S3. Add inorganic dielectric-coated high-dielectric inorganic particles to the first mixed system and disperse them to obtain a second mixed system; S4. Add a crosslinking agent to the second mixture system, and obtain an electro-tack-reducing pressure-sensitive adhesive after degassing.

[0015] The present invention also provides the application of the above-mentioned electro-tack adhesive tape for detachable bonding scenarios. The application method includes: bonding the electro-tack pressure-sensitive adhesive layer of the electro-tack adhesive tape to a first substrate, bonding the conventional pressure-sensitive adhesive layer to a second substrate, electrically connecting the first comb electrode and the second comb electrode to an external DC power supply respectively, and applying a DC voltage of 1~60V for 0.5~300s before performing a peeling operation.

[0016] The present invention has the following beneficial effects: (1) By introducing specific acrylate monomers containing redox groups into the acrylate copolymer matrix and co-designing them with soft monomers, hard monomers and functional monomers, the redox centers are firmly fixed in the adhesive network. This allows the adhesive layer to maintain the bonding performance of conventional acrylate pressure-sensitive adhesives when no electricity is applied; when a DC voltage is applied, lithium salt ions in the solid electrolyte phase migrate directionally along the electric field direction, and the ion concentration near the comb electrode increases; at the same time, the ferrocene or 4,4'-bipyridinium groups introduced into the side chain of the adhesive layer undergo a reversible redox transition, which changes the local charge distribution and polar environment, thereby achieving a stable and controllable switching of the bonding state between the two working conditions; (2) A solid polymer electrolyte phase composed of polyether side chain acrylate polymer and lithium salt is introduced to limit the ratio range of ether oxygen and lithium ions. The solid electrolyte phase forms a connected network that runs through the thickness of the adhesive layer in the acrylate matrix, allowing ions to migrate under the action of an electric field. However, this network is confined by the polymer matrix and dielectric shell. Ion movement is limited by polymer chain segments and interface environment, forming a continuous and confined ion conduction path in the adhesive layer. This allows a stable ion migration and charge rearrangement environment to be established with only medium and low DC voltage, while avoiding significant disturbance to normal bonding performance. (3) The inorganic particles with the "high dielectric core-dielectric shell" structure effectively enhance the local electric field strength in the thickness direction of the adhesive layer. At the same time, the shell layer reduces the direct electrochemical contact between the particle surface and the electrolyte and redox center, thereby improving the electric field response efficiency while ensuring the long-term chemical stability of the system. (4) By combining the adhesive with a specific comb electrode layer and a controlled electrical insulation layer, the electric field is uniformly distributed in the plane and thickness direction of the adhesive layer, effectively avoiding local breakdown and inconsistent response problems, and ensuring the stability and reliability of the electrical control de-adhesion process from the structural level. (5) By setting an electrolyte content gradient along the thickness direction in a bilayer structure, the first sublayer has a higher content of solid electrolyte phase, which mainly undertakes the functions of ion migration and redox response; the second sublayer has a lower content of solid electrolyte phase, which is used to provide mechanical support and long-term adhesive performance of the adhesive layer as a whole. When energized, the electric field and ion rearrangement are mainly concentrated in the first sublayer, thus generating significant structural relaxation and interfacial energy changes in this layer, achieving the difference in peel strength between the on and off states; the second sublayer restricts the overall fluidity of the adhesive layer, reducing the risk of rheological instability and aging caused by excessive conductive phase content. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the preparation process of the electro-tack reducing pressure-sensitive adhesive of the present invention. Detailed Implementation

[0018] To facilitate understanding and implementation of the present invention by those skilled in the art, the present invention will be further described below in conjunction with embodiments, but should not be construed as limiting the scope of protection of the claims.

[0019] "Based on solid weight parts" means that the non-volatile solids after removing organic solvents and other volatile components from the system are used as the measurement basis, and the amount of each component added is expressed as solid state or converted into solid content by weight parts; "total monomers" refers to the total mass of soft monomers, hard monomers, functional monomers and acrylate monomers containing redox groups used to prepare the acrylate copolymer matrix. The mass fraction of acrylate monomers containing redox groups in the total monomers is used to limit their proportion in the copolymer feed.

[0020] The acrylate copolymer matrix is ​​obtained by free radical copolymerization of soft monomers, hard monomers, functional monomers, and acrylate monomers containing redox groups. Based on 100 parts by weight of the total monomers in the acrylate copolymer matrix, the soft monomer is an alkyl (meth)acrylate with 4-12 carbon atoms, used in an amount of 50-85 parts by weight; the hard monomer is methyl methacrylate or styrene, used in an amount of 5-30 parts by weight; and the functional monomer is hydroxyethyl acrylate, hydroxypropyl acrylate, glycidyl methacrylate, acrylic acid, or methacrylate. One or more acids are used, in an amount of 1-20 parts by weight; the acrylate monomer containing redox groups is a free radical copolymer monomer containing ferrocene groups or bipyridinium groups, with a mass fraction of 0.2%-12% in the total monomer amount, and in some embodiments selected from one or more of ferrocene methyl methacrylate, ferrocene methyl acrylate, and 4,4'-bipyridinium salt methacrylate, wherein the anion of the bipyridinium salt in the 4,4'-bipyridinium salt methacrylate is selected from tetrafluoroborate. hexafluorophosphate and bis(trifluoromethanesulfonyl)imide One or more of them.

[0021] The term "4,4'-bipyridinium salt methacrylate" as used in this specification is a general term for a class of methacrylate monomers containing a 4,4'-bipyridinium cationic skeleton, and does not refer to a single specific compound. Its cationic moiety originates from the 4,4'-bipyridine skeleton, with an organic substituent bearing a methacrylate group attached in quaternary ammonium form to at least one pyridine ring nitrogen atom of the bipyridine skeleton, thereby forming a 4,4'-bipyridinium cation. This gives the monomer both a polymerizable methacrylate double bond and a 4,4'-bipyridinium redox center. Its anionic moiety is an inert anion paired with the cation, preferably selected from one or more of tetrafluoroborate, hexafluorophosphate, and bis(trifluoromethanesulfonyl)imide.

[0022] The flexible macromonomer is a flexible component that can be copolymerized and grafted, containing at least one acrylate group or methacrylate group that can be copolymerized by free radicals, and the main chain is a polysiloxane segment or a hydrogenated polydiene segment; the flexible macromonomer is 2 to 25 parts by weight of solids.

[0023] The solid polymer electrolyte phase comprises 5 to 40 parts by weight of solids, including 2 to 30 parts by weight of acrylate polymer or copolymer containing polyether side chains and 0.5 to 15 parts by weight of electrolyte salt; the electrolyte salt is a lithium salt selected from one or more of lithium bis(trifluoromethanesulfonylimide) (LiTFSI), lithium hexafluorophosphate (LiPF6), and lithium tetrafluoroborate (LiBF4); the molar ratio of ether oxygen atoms to lithium ions in the polyether side chains is 5:1 to 30:1.

[0024] The high-dielectric inorganic particles coated with inorganic dielectric material are 1 to 25 parts by weight of solid material. The high-dielectric inorganic particles are selected from one or more of barium titanate (BaTiO3), strontium titanate (SrTiO3), lead zirconate titanate (PZT), and lithium niobate (LiNbO3), and their particle size distribution D50 is 0.05 to 3 μm. The outer surface of the high-dielectric inorganic particles is coated with an inorganic dielectric shell, which is selected from one or more of silicon dioxide (SiO2), aluminum oxide (Al2O3), and silicon nitride (Si3N4), and the shell thickness is 5 to 300 nm.

[0025] The crosslinking agent is 0.2 to 8 parts by weight of solids, and in some embodiments is selected from one or more of polyfunctional epoxy compounds, carbodiimide compounds and polyfunctional aziridine compounds.

[0026] Example 1 This embodiment provides a preferred formulation and preparation method of an electro-tack reducing pressure-sensitive adhesive. The formulation of the electro-tack reducing pressure-sensitive adhesive, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 8 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent.

[0027] The solid polymer electrolyte phase consists of 15 parts of an acrylate polymer containing polyether side chains and 5.51 parts of an electrolyte salt, LiTFSI. The molar ratio of ether oxygen atoms to lithium ions in the polyether side chains is 15:1. The acrylate polymer containing polyether side chains is a polymer obtained by polymerization of polyethylene glycol monomethyl ether methacrylate (PEGMA) monomer, with a number average molecular weight of 50,000. The inorganic dielectric-coated high-dielectric inorganic particles are BaTiO3 particles with a D50 of 0.50 μm, coated with a SiO2 inorganic dielectric shell with a shell thickness of 50 nm. The flexible macromolecular monomer is a polydimethylsiloxane segment macromolecular monomer with methacrylate end groups, with a number average molecular weight of 10,000. The crosslinking agent is a trifunctional aziridine crosslinking agent.

[0028] The monomer composition of the acrylate copolymer matrix, based on a total monomer weight of 100.00g, is as follows: 72.00g of soft monomers (60.00g of 2-ethylhexyl acrylate and 12.00g of n-butyl acrylate); 18.00g of hard monomers (18.00g of methyl methacrylate); 8.00g of functional monomers (5.00g of hydroxyethyl acrylate and 3.00g of acrylic acid); and 2.00g of acrylate monomers containing redox groups (2.00g of ferrocene methyl methacrylate).

[0029] The preparation method includes the following steps: S1. Add 200.00g of ethyl acetate to the reaction vessel, then add the soft monomer, hard monomer, functional monomer, acrylate monomer containing redox groups and 10.00g of flexible macromolecular monomer in sequence. Set the stirring speed to 300r / min and purge with nitrogen for 30min. After heating to 70℃, add 0.50g of azobisisobutyronitrile and react at 70℃ for 6h to obtain an acrylate copolymer solution containing the acrylate copolymer matrix. S2. Add 15.00 g of the acrylate polymer containing polyether side chains to the acrylate copolymer solution, stir for 20 min, add 5.51 g of LiTFSI, and continue stirring for 40 min to obtain the first mixed system; S3. Add 8.00g of BaTiO3@SiO2 particles to the first mixed system in three portions. After each addition, shear and disperse at 2,000r / min for 10min. After the three additions are completed, continue to disperse at 2,000r / min for 20min to obtain the second mixed system. S4. Add 1.00 g of crosslinking agent to the second mixture, stir for 5 min, and then degas under vacuum at -0.09 MPa for 10 min to obtain the coating liquid; S5. The coating liquid is applied to the surface of the silicone oil release PET film using a doctor blade, with the doctor blade wet film gap set to 250 μm; it is then dried at 80°C for 10 min and cured at 120°C for 20 min. After cooling, an electro-tack reducing pressure-sensitive adhesive film layer is obtained, with a dry film thickness of 100 μm.

[0030] Example 2 This embodiment provides a formulation and preparation method for an electro-tack reducing pressure-sensitive adhesive. The electro-tack reducing pressure-sensitive adhesive formulation (by solid weight) includes: 100 parts of acrylate copolymer matrix, 2 parts of flexible macromolecular monomer, 5 parts of solid polymer electrolyte phase, 1 part of inorganic dielectric-coated high dielectric inorganic particles, and 0.2 parts of crosslinking agent.

[0031] The solid polymer electrolyte phase consists of 4.00 parts of an acrylate polymer containing polyether side chains and 1.00 parts of the electrolyte salt LiBF4 (lithium tetrafluoroborate). The high-dielectric inorganic particles with inorganic dielectric coating are BaTiO3 particles with a D50 of 0.50 μm, coated with a SiO2 inorganic dielectric shell with a thickness of 50 nm. The flexible macromonomer is a polydimethylsiloxane segment macromonomer with methacrylate end groups and a number average molecular weight of 10,000. The crosslinking agent is a trifunctional aziridine crosslinking agent.

[0032] Monomer composition of the acrylate copolymer matrix (total monomers 100.00g): 80.00g soft monomers (68.00g 2-ethylhexyl acrylate, 12.00g n-butyl acrylate); 15.00g hard monomers (15.00g methyl methacrylate); 4.80g functional monomers (3.00g hydroxyethyl acrylate, 1.80g acrylic acid); 0.20g acrylate monomers containing redox groups (0.20g ferrocene methyl methacrylate).

[0033] Except for the following differences, the preparation method is the same as in Example 1 in terms of operating conditions and steps: In step S1, the amount of azobisisobutyronitrile used is 0.40 g, and the polymerization reaction time is 5 h; In step S2, the amount of solid polymer electrolyte phase added is 4.00 g of acrylate polymer containing polyether side chains and 1.00 g of electrolyte salt, and the mixture is stirred for 60 min. In step S3, the amount of BaTiO3@SiO2 particles added is 1.00 g, and the particles are sheared and dispersed at 2,000 r / min for 20 min. In step S4, the amount of crosslinking agent added is 0.20g; In step S5, the gap between the doctor blade and the wet film is 220 μm. The drying and curing conditions are: drying at 80℃ for 10 min and curing at 120℃ for 20 min. The actual measured thickness of the dry film is 80 μm.

[0034] Example 3 This embodiment provides an upper limit formulation of an electro-tack reducing pressure-sensitive adhesive and its preparation method. The formulation of the electro-tack reducing pressure-sensitive adhesive, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 25 parts of flexible macromolecular monomer, 40 parts of solid polymer electrolyte phase, 25 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 8 parts of crosslinking agent.

[0035] The solid polymer electrolyte phase consists of 25.00 parts of an acrylate polymer containing polyether side chains and 15.00 parts of an electrolyte salt, LiTFSI. The inorganic dielectric-coated high-dielectric inorganic particles are PZT particles with a D50 of 3.00 μm, coated with an Al2O3 inorganic dielectric shell with a thickness of 200 nm. The flexible macromonomer is a polydimethylsiloxane segment macromonomer with methacrylate end groups and a number-average molecular weight of 10,000. The crosslinking agent is a trifunctional aziridine crosslinking agent.

[0036] The monomer composition of the acrylate copolymer matrix, based on a total monomer weight of 100.00g, is as follows: 60.00g of soft monomers (48.00g of 2-ethylhexyl acrylate and 12.00g of n-butyl acrylate); 20.00g of hard monomers (20.00g of methyl methacrylate); 8.00g of functional monomers (5.00g of hydroxyethyl acrylate and 3.00g of acrylic acid); and 12.00g of acrylate monomers containing redox groups (12.00g of ferrocene methyl methacrylate).

[0037] Except for the following differences, the preparation method is the same as in Example 1 in terms of operating conditions and steps: In step S1, the amount of ethyl acetate used was 300.00 g, and the amount of azobisisobutyronitrile used was 0.80 g; the remaining reaction temperature and reaction time were the same as in Example 1. In step S2, the amount of solid polymer electrolyte phase added is 25.00 g of acrylate polymer containing polyether side chains and 15.00 g of LiTFSI, and the mixture is stirred for 90 min. In step S3, the amount of PZT@Al2O3 particles added is 25.00g; first, shear dispersion is performed at 2,000r / min for 30min, and then three-roll dispersion is performed twice. In step S4, the amount of crosslinking agent added is 8.00g, and the stirring time after adding the crosslinking agent is 3min; In step S5, the gap between the doctor blade and the wet film is 320 μm; the drying and curing conditions are: drying at 80℃ for 10 min and curing at 120℃ for 30 min, and the actual measured thickness of the dry film is 150 μm.

[0038] Example 4 This embodiment provides a formulation and preparation method of an electro-tack reducing pressure-sensitive adhesive. The formulation of the electro-tack reducing pressure-sensitive adhesive, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 8 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent.

[0039] The solid polymer electrolyte phase consists of 15.00 parts of an acrylate polymer containing polyether side chains and 5.51 parts of an electrolyte salt, LiTFSI. The acrylate polymer containing polyether side chains is a polyethylene glycol monomethyl ether methacrylate homopolymer with a number-average molecular weight of 50,000. The inorganic dielectric-coated high-dielectric inorganic particles are BaTiO3 particles with a D50 of 0.50 μm, coated with a SiO2 inorganic dielectric shell with a shell thickness of 50 nm. The flexible macromonomer is a polydimethylsiloxane segment macromonomer with methacrylate end groups and a number-average molecular weight of 10,000. The crosslinking agent is a trifunctional aziridine crosslinking agent.

[0040] The monomer composition of the acrylate copolymer matrix, based on a total monomer weight of 100.00g, is as follows: 72.00g soft monomer (60.00g 2-ethylhexyl acrylate, 12.00g n-butyl acrylate); 18.00g hard monomer (18.00g methyl methacrylate); 8.00g functional monomer (5.00g hydroxyethyl acrylate, 3.00g acrylic acid); and 2.00g acrylate monomer containing redox groups, wherein the acrylate monomer containing redox groups is 2.00g 4,4'-bipyridinium salt methacrylate, and the anion of the bipyridinium salt is... .

[0041] The preparation method is the same as in Example 1, except for the following differences: the acrylate monomer containing redox groups in step S1 is replaced with 2.00 g of 4,4'-bipyridinium salt methacrylate (anionic acid is...). The raw material usage and process parameters for steps S2 to S5 are the same as in Example 1.

[0042] Example 5 This embodiment provides an electro-adhesive tape and its application method. The electro-adhesive tape includes a substrate layer, a comb electrode layer, an electrically insulating layer, an electro-adhesive pressure-sensitive adhesive layer, and a conventional pressure-sensitive adhesive layer located on the back of the substrate, which are stacked sequentially. The electro-adhesive pressure-sensitive adhesive layer is obtained by curing an electro-adhesive pressure-sensitive adhesive into a film. The composition and parameters of each layer of the electro-adhesive tape are as follows: Substrate layer: polyethylene terephthalate (PET) film, 50 μm thick.

[0043] Comb electrode layer: The first comb electrode and the second comb electrode are formed on the surface of the substrate layer by screen printing with silver conductive paste and cured at 120°C for 10 min; the finger width of the first comb electrode and the second comb electrode is 100 μm and the finger spacing is 100 μm; the lead-out ends of the two electrodes are respectively formed into independent pads and are electrically insulated.

[0044] Electrical insulation layer: polyimide insulating coating, dry film thickness 10μm.

[0045] Electro-tack reducing pressure-sensitive adhesive layer: obtained by coating, drying and curing the coating liquid obtained in Example 1 into a film with a dry film thickness of 100 μm.

[0046] Conventional pressure-sensitive adhesive layer: coated on the back of the substrate layer for bonding with the second substrate, and can use a conventional acrylic pressure-sensitive adhesive formulation with a dry film thickness of, for example, 40 μm; a silicone oil release PET film is laminated on the back of the conventional pressure-sensitive adhesive layer as a release layer with a release film thickness of 38 μm.

[0047] The application method of the electro-adhesive tape includes the following steps: U1. Cutting: Cut the electro-adhesive tape into 25mm×80mm samples; U2. Bonding and Pressing: After peeling off the release layer, place one side of the electro-adhesive pressure-sensitive adhesive layer facing the first substrate and the other side of the conventional pressure-sensitive adhesive layer facing the second substrate. Place the electro-adhesive tape between the first substrate and the second substrate, wherein the first substrate is an aluminum alloy plate and the second substrate is a glass plate. Press under 0.50 MPa pressure for 30 seconds and let stand at 25°C for 60 minutes. U3. Electrical connection: Connect the first comb tooth electrode and the second comb tooth electrode to the two poles of the DC power supply respectively; U4. Power on: Apply 24V DC voltage and maintain for 30s; U5. Peeling: After power is off, perform the peeling operation at a peeling angle of 180° and a peeling speed of 300 mm / min.

[0048] Example 6 This embodiment provides a double-layer electro-adhesive tape. The electro-adhesive tape in this embodiment is basically the same as that in Embodiment 5, except that: the electro-adhesive pressure-sensitive adhesive layer adopts a double-layer structure in which the first and second sub-layers are arranged adjacently. First, a first sub-layer coating liquid is applied to the surface of the electrically insulating layer and dried to form the first sub-layer; then, a second sub-layer coating liquid is applied to the surface of the first sub-layer and dried to form the second sub-layer.

[0049] The formulations of the electro-tack reducing pressure-sensitive adhesive corresponding to the two sublayers are as follows: First sublayer formulation (by solid weight): 100 parts acrylate copolymer matrix, 10 parts flexible macromolecular monomer, 30 parts solid polymer electrolyte phase, 8 parts inorganic dielectric-coated high-dielectric inorganic particles, and 1 part crosslinking agent; Second sublayer formulation (by solid weight): 100 parts acrylate copolymer matrix, 10 parts flexible macromolecular monomer, 10 parts solid polymer electrolyte phase, 8 parts inorganic dielectric-coated high-dielectric inorganic particles, and 1 part crosslinking agent. The monomer composition of the acrylate copolymer matrix, the type and parameters of the flexible macromolecular monomer, the type and parameters of the inorganic dielectric-coated high-dielectric inorganic particles, and the type and parameters of the crosslinking agent are all the same as in Example 1.

[0050] The preparation of the two coating solutions includes the following steps: S1. Prepare the same batch of acrylate copolymer solution according to step S1 of Example 1; S2 (first sublayer mixing system): 21.94 g of acrylate polymer containing polyether side chains and 8.06 g of LiTFSI were added to the acrylate copolymer solution and stirred for 90 min to obtain the first sublayer first mixing system. S2 (Second Sublayer Mixing System): 7.31 g of acrylate polymer containing polyether side chains and 2.69 g of LiTFSI were added to the acrylate copolymer solution and stirred for 90 min to obtain the first mixing system of the second sublayer. S3. Add 8.00 g of BaTiO3@SiO2 particles to each of the two first mixed systems mentioned above, and disperse them at 2,000 r / min for 40 min to obtain two second mixed systems. S4. Add 1.00 g of crosslinking agent to each of the two second mixed systems, stir for 5 min, and then degas under vacuum at -0.09 MPa for 10 min to obtain the first sublayer coating solution and the second sublayer coating solution respectively.

[0051] The total thickness of the bilayer electro-adhesive pressure-sensitive adhesive layer is 100 μm, of which the thickness of the first sublayer is 15 μm and the thickness of the second sublayer is 85 μm.

[0052] Comparative Example 1 This comparative example provides a pressure-sensitive adhesive formulation and preparation method. The formulation, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 8 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent; wherein the type and coating parameters of the solid polymer electrolyte phase, the inorganic dielectric-coated high-dielectric inorganic particles, the type of flexible macromolecular monomer, and the type of crosslinking agent are the same as in Example 1.

[0053] The monomer composition of the acrylate copolymer matrix, based on a total monomer weight of 100.00g, is as follows: 72.00g of soft monomers (60.00g of 2-ethylhexyl acrylate and 12.00g of n-butyl acrylate); 20.00g of hard monomers (20.00g of methyl methacrylate); 8.00g of functional monomers (5.00g of hydroxyethyl acrylate and 3.00g of acrylic acid); and 0.00g of acrylate monomers containing redox groups, of which 2.00g is supplemented with methyl methacrylate to maintain a total monomer weight of 100.00g.

[0054] The preparation method is the same as in Example 1.

[0055] Comparative Example 2 This comparative example provides a pressure-sensitive adhesive formulation and preparation method. The formulation, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 0 parts of solid polymer electrolyte phase, 8 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent; wherein the types of inorganic dielectric-coated high-dielectric inorganic particles, flexible macromolecular monomer, and crosslinking agent are the same as in Example 1.

[0056] The monomer composition of the acrylate copolymer matrix is ​​the same as in Example 1.

[0057] Except for the following differences, the preparation method is the same as in Example 1 in terms of operating conditions and steps: Step S2 omits the "adding solid polymer electrolyte phase" operation and directly uses the acrylate copolymer solution obtained in step S1 as the subsequent dispersion matrix; In step S3, 8.00 g of BaTiO3@SiO2 particles were added to the acrylate copolymer solution in three portions. After each addition, the particles were sheared and dispersed at 2,000 r / min for 10 min. After the addition was completed, the particles were sheared and dispersed at 2,000 r / min for 20 min. In step S5, to obtain a dry film thickness of 100 μm, the gap between the doctor blade and the wet film is set to 293 μm, and the drying and curing conditions are the same as in Example 1.

[0058] Comparative Example 3 This comparative example provides a pressure-sensitive adhesive formulation and preparation method. The formulation, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 8 parts of high-dielectric inorganic particles, and 1 part of crosslinking agent. The high-dielectric inorganic particles are uncoated BaTiO3 particles with a D50 of 0.50 μm. Except for the coating state of the high-dielectric inorganic particles, the types and parameters of all other components are the same as in Example 1.

[0059] The monomer composition of the acrylate copolymer matrix is ​​the same as in Example 1.

[0060] Except for the following differences, the other operating conditions and steps are the same as in Example 1: In step S3, the BaTiO3@SiO2 particles are replaced with 8.00g of uncoated BaTiO3 particles, and the dispersion program, rotation speed and time are the same as in Example 1.

[0061] Comparative Example 4 This comparative example provides a pressure-sensitive adhesive formulation and preparation method. The formulation, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 0 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 8 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent; wherein the type and coating parameters of the solid polymer electrolyte phase, the inorganic dielectric-coated high-dielectric inorganic particles, and the type of crosslinking agent are the same as in Example 1. The monomer composition of the acrylate copolymer matrix is ​​the same as in Example 1.

[0062] Except for the following differences, the preparation method is the same as in Example 1: 10.00g of flexible macromolecular monomer is not added in step S1.

[0063] Comparative Example 5 This comparative example provides a pressure-sensitive adhesive formulation and preparation method. The formulation, by solid weight, comprises: 100 parts of acrylate copolymer matrix, 10 parts of flexible macromolecular monomer, 20.51 parts of solid polymer electrolyte phase, 0 parts of inorganic dielectric-coated high-dielectric inorganic particles, and 1 part of crosslinking agent; except for the high-dielectric inorganic particles, the types and parameters of the other components are the same as in Example 1. The monomer composition of the acrylate copolymer matrix is ​​the same as in Example 1.

[0064] Except for the following differences, the preparation method is the same as that in Example 1: the particle addition and dispersion steps are omitted in step S3, and the process proceeds directly to step S4 after step S2; in step S5, in order to obtain a dry film thickness of 100 μm, the gap between the doctor blade and the wet film is set to 265 μm, and the drying and curing conditions are the same as in Example 1.

[0065] Comparative Example 6 This comparative example provides an electro-tack reducing adhesive tape. The adhesive tape is basically the same as that of Example 5, except that the adhesive tape does not have an electrically insulating isolation layer. During preparation, after the comb electrode layer is formed and cured, the coating liquid obtained in Example 1 is directly applied to the surface of the comb electrode layer, and a film is formed according to the drying and curing conditions of Example 1. Subsequently, a release layer is laminated to obtain the adhesive tape.

[0066] Comparative Example 7 This comparative example provides an electro-tack reducing adhesive tape, which is basically the same as that in Example 6; the difference is that the electro-tack reducing pressure-sensitive adhesive layer is coated once with the coating liquid of Example 1 to form a film with a dry film thickness of 100 μm, without performing two sequential coatings to form a bilayer structure.

[0067] To verify the technical effects of the electro-tack reducing pressure-sensitive adhesive and electro-tack reducing adhesive tape of the present invention, corresponding samples were prepared according to Examples 1 to 6 and Comparative Examples 1 to 7. Under uniform bonding, standing and peeling conditions, the peeling force F0 without energization, the peeling force Fe after energization and the electro-tack reducing ratio R were tested, and the performance retention after three consecutive on-off cycles was examined.

[0068] In Examples 1-5 and Comparative Examples 1-5, the samples were prepared based on the double-sided structure described in Example 5, using polyethylene terephthalate (PET) film as the substrate layer. A comb-tooth electrode layer, an electrically insulating layer, and an electrically reducing pressure-sensitive adhesive layer were sequentially formed on one side of the substrate. A conventional pressure-sensitive adhesive layer was coated on the back side of the substrate, and a silicone oil release PET film was laminated on the outside of the conventional pressure-sensitive adhesive layer as a release layer. The sample in Example 6 used the double-layer electrically reducing adhesive tape described in Example 6. The sample in Comparative Example 6 used an electrically reducing adhesive tape without an electrically insulating layer. The sample in Comparative Example 7 used an electrically reducing adhesive tape with a single-layer electrically reducing pressure-sensitive adhesive layer structure, except that the double-layer electrically reducing pressure-sensitive adhesive layer in Example 6 was replaced with a single-layer electrically reducing pressure-sensitive adhesive layer obtained by one-time coating of the electrically reducing pressure-sensitive adhesive obtained in Example 1.

[0069] Test indicators and methods include: Peel force F0 (N / 25mm) without energization: The electro-tack tape is sandwiched between two adhered objects and pressed together (pressure 0.50MPa, time 30s). During bonding, the electro-tack pressure-sensitive adhesive side faces the first adhered object and the conventional pressure-sensitive adhesive side faces the second adhered object. After standing at 25℃ for 60min, a 180° peel test is performed using a tensile testing machine at a peel speed of 300mm / min. The average peel force in the stable segment of the peel curve is recorded as the F0 of the sample.

[0070] Peel force Fe (N / 25mm) after power-on: After completing the bonding preparation and resting process corresponding to F0, connect the first comb electrode and the second comb electrode to the two poles of the DC power supply respectively, apply a set DC voltage of 24V and maintain it for 30s. Within 30s after power-off, perform a 180° peel test under the same conditions as F0, and record the average peel force of the stable section as the peel force Fe after power-on. Among them, the peel force obtained by the first power-on and power-off is recorded as Fe1; after completing one power-on peel, re-attach and repeat the power-on and power-off bonding operation under the same conditions, for a total of 3 cycles, and the peel force after the third power-on and power-off is recorded as Fe3.

[0071] Electro-viscosity reduction ratio R (%): The electro-viscosity reduction ratio corresponding to the first on / off switch is calculated by the following formula: R1=(F0-Fe1) / F0×100%, and the electro-viscosity reduction ratio corresponding to the third on / off switch is calculated by the following formula: R3=(F0-Fe3) / F0×100%; Electro-viscosity reduction ratio retention rate (%): Retention rate=R3 / R1×100%.

[0072] The test results are shown in Table 1.

[0073]

[0074] According to the data in Table 1, under unpowered conditions, the initial peel strength F0 of Examples 1-6 was 9.2-12.3 N / 25 mm, which is at a medium to high level for conventional adhesive tapes. The F0 values ​​of Examples 1, 4-6 were concentrated between 11-11.5 N / 25 mm, indicating that even after introducing flexible macromolecular monomers, solid polymer electrolyte phases, and inorganically coated high-dielectric particles, a relatively balanced initial adhesive strength could still be maintained. In contrast, Comparative Example 4, without the addition of flexible macromolecular monomers, showed an F0 increase to 13.5 N / 25 mm, indicating that the excessive initial adhesive force was detrimental to disassembly; Comparative Example 5, without the addition of high-dielectric particles, showed an F0 decrease to 10.5 N / 25 mm, suggesting that the high-dielectric particles, in addition to regulating the electric field, also reinforced the adhesive layer structure.

[0075] Under energized conditions, the electro-tack reduction ratio R1 of Examples 1-6 ranged from 60% to 82%, with R1 of Examples 1 and 4-6 all exceeding 73%, and Example 6 reaching the highest at 82%. After energization, the peel force Fe1 decreased to 2.0-3.0 N / 25 mm, demonstrating a significant tack reduction effect. Comparative Examples 1 and 2 lacked monomers containing redox groups or solid polymer electrolyte phases, respectively, resulting in R1 of only 8% and 5%, with Fe1 close to F0, indicating a weak tack reduction effect. The R1 of Comparative Examples 3 and 5 were 40% and 20%, respectively, significantly lower than the 75% of Example 1. The R1 of Comparative Example 4 was only 30%, and its F0 was relatively high, indicating poor overall performance.

[0076] A comparison of Example 1 with Comparative Examples 1 and 2 shows that the monomer containing redox groups and the solid polymer electrolyte phase have a synergistic effect. In Example 1, only methyl methacrylate was replaced with a ferrocene monomer; the F0 values ​​were essentially the same, but R1 increased from 8% to 75%, and R3 increased from 6% to 71%, indicating that the monomer containing redox groups is the core active component for achieving electro-thickness reduction. In Example 1, only the solid polymer electrolyte phase was missing; R1 decreased to 5%, and R3 was only 3%, indicating that without an ionicly conductive phase to provide carrier migration channels, even with the presence of redox centers, it is difficult to form an effective conductive network, and the electro-thickness reduction effect cannot be achieved.

[0077] The comparison between Example 1, Comparative Example 3, and Comparative Example 5 shows that inorganic dielectric coating of high-dielectric particles plays an important role. Example 1, using BaTiO3@SiO2 particles, achieved an R1 of 75%, an R3 of 71%, and a retention rate of 94.7%. Comparative Example 3, using uncoated BaTiO3, saw R1 drop to 40%, with a retention rate of only 75.0%. Comparative Example 5, without the addition of high-dielectric particles, further reduced R1 to 20%. This indicates that high-dielectric particles can improve electric field utilization efficiency, and surface dielectric coating can suppress electrochemical side reactions, which is beneficial to cycle stability.

[0078] A comparison between Example 1 and Comparative Example 4 shows that flexible macromolecular monomers help to adjust overall performance. Comparative Example 4, without the addition of flexible macromolecular monomers, showed an increase in F0 to 13.5 N / 25 mm, with R1 at only 30% and R3 at 20%. This indicates that flexible segments can adjust the microscopic deformation and stress relaxation of the adhesive layer, preventing the network from becoming too rigid, thereby achieving efficient electro-tack reduction while maintaining a moderate initial adhesive force.

[0079] The comparison of Examples 1-3 illustrates that there is an optimal range of proportions for each component. Example 2 corresponds to the lower limit of the proportion, with a slightly higher F0 and lower electro-tack reduction performance; Example 3 corresponds to the upper limit of the proportion, with a lower F0 and decreased cycle retention rate. Example 1 uses an intermediate proportion, achieving a better balance between initial bond strength, electro-tack reduction ratio, and cycle stability.

[0080] Example 4 uses 4,4'-bipyridinium salt methacrylate to replace the ferrocene monomer, and its performance is similar to that of Example 1, indicating that both types of redox monomers are applicable. Example 5 uses the adhesive from Example 1 in a comb-tooth electrode structure, increasing R1 to 76% and achieving a retention rate of 96.1%, demonstrating that optimizing the electrode and electrical insulation layer design can improve the electric field distribution, enhance the electro-tack reduction effect, and improve cycle stability.

[0081] Comparative Example 6, which did not have an electrical insulation layer, had an initial R1 of 72%, but the retention rate was only 80.6%, lower than the 96.1% of Example 5. This indicates that the insulation layer plays an important role in uniform electric field and suppressing local breakdown.

[0082] Example 6 employs a bilayer gradient structure with an R1 of 82% and a retention rate of 95.1%, which is significantly higher than that of the monolayer structure in Comparative Example 7. This indicates that gradient design can create an ion-rich conductive region on the electrode side, further improving the electro-adhesion reduction efficiency.

[0083] In summary, this invention, through specific component and structural design, achieves efficient and stable electro-controlled tack reduction performance while maintaining moderate initial adhesion.

[0084] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An electro-tack reducing pressure-sensitive adhesive, characterized in that, The product comprises, by solid weight, 100 parts of acrylate copolymer matrix, 2-25 parts of flexible macromolecular monomer, 5-40 parts of solid polymer electrolyte phase, 1-25 parts of high-dielectric inorganic particles, and 0.2-8 parts of crosslinking agent; wherein: the acrylate copolymer matrix is ​​obtained by free radical copolymerization of soft monomer, hard monomer, functional monomer and acrylate monomer containing redox groups, the acrylate monomer containing redox groups has a mass fraction of 0.2%-12% in the total monomer amount, and contains ferrocene groups or bipyridinium groups; the flexible macromolecular monomer contains at least one free radical copolymerizable acrylate group or methacrylate group, and the main chain is a polysiloxane segment or a hydrogenated polydiene segment; the high-dielectric inorganic particles are coated with an inorganic dielectric shell.

2. The electro-tack reducing pressure-sensitive adhesive according to claim 1, characterized in that, Based on 100 parts by weight of the total monomers of the acrylate copolymer matrix, the soft monomer is an alkyl methacrylate with 4 to 12 carbon atoms, and the amount used is 50 to 85 parts by weight; the hard monomer is methyl methacrylate or styrene, and the amount used is 5 to 30 parts by weight; the functional monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, glycidyl methacrylate, acrylic acid and methacrylic acid, and the amount used is 1 to 20 parts by weight.

3. The electro-tack reducing pressure-sensitive adhesive according to claim 1, characterized in that, The acrylate monomer containing redox groups is selected from one or more of ferrocene methyl methacrylate, ferrocene methyl acrylate, and 4,4'-bipyridinium salt methacrylate; wherein the 4,4'-bipyridinium salt methacrylate is a methacrylate monomer having a 4,4'-bipyridinium cationic skeleton, and the anion of its bipyridinium salt is selected from one or more of tetrafluoroborate, hexafluorophosphate, and bis(trifluoromethanesulfonyl)imide.

4. The electro-tack reducing pressure-sensitive adhesive according to claim 1, characterized in that, The solid polymer electrolyte phase comprises: 2-30 parts by weight of an acrylate polymer containing polyether side chains, and 0.5-15 parts by weight of an electrolyte salt; the electrolyte salt is a lithium salt, selected from one or more of lithium bis(trifluoromethanesulfonyl)imide, lithium hexafluorophosphate, and lithium tetrafluoroborate; the molar ratio of ether oxygen atoms to lithium ions in the polyether side chains is 5:1 to 30:

1.

5. The electro-tack reducing pressure-sensitive adhesive according to claim 1, characterized in that, The high-dielectric inorganic particles are selected from one or more of barium titanate, strontium titanate, lead zirconate titanate, and lithium niobate, with a particle size distribution D50 of 0.05~3μm; the inorganic dielectric shell is selected from one or more of silicon dioxide, aluminum oxide, and silicon nitride, with a shell thickness of 5~300nm.

6. An electro-adhesive tape made using the electro-adhesive pressure-sensitive adhesive according to any one of claims 1 to 5, characterized in that, The material comprises a substrate layer, a comb electrode layer, an electrically insulating isolation layer, an electrically reducing pressure-sensitive adhesive layer, and a conventional pressure-sensitive adhesive layer located on the back of the substrate, stacked sequentially. The comb electrode layer includes a first comb electrode and a second comb electrode that are insulated from each other. The finger width of the first comb electrode and the second comb electrode is 20-500 μm, and the finger spacing is 20-500 μm. The electrically insulating isolation layer has a thickness of 1-30 μm and a dielectric constant of 3-30 at 1 kHz. The electrically reducing pressure-sensitive adhesive layer has a thickness of 20-300 μm and is obtained by coating and drying / curing the electrically reducing pressure-sensitive adhesive into a film.

7. The electro-adhesive tape according to claim 6, characterized in that, The electro-tack reducing pressure-sensitive adhesive layer includes a first sub-layer and a second sub-layer disposed adjacent to each other along the thickness direction; the first sub-layer is close to the electrical insulating isolation layer, and the weight ratio of the solid polymer electrolyte phase in the first sub-layer to the solid polymer electrolyte phase in the second sub-layer is (1.5~10):1; the thickness of the first sub-layer is 2~30μm, and the thickness of the second sub-layer is 10~270μm.

8. The electro-adhesive tape according to claim 6, characterized in that, The electrically insulating layer is one or more of acrylate insulating coatings, polyurethane insulating coatings, polyimide insulating coatings, and silicon-containing inorganic oxide insulating coatings, and the volume resistivity of the electrically insulating layer is 10⁻⁶. 7 ~10 12 Ω·m.

9. A method for preparing an electro-tack reducing pressure-sensitive adhesive according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Soft monomers, hard monomers, functional monomers, acrylate monomers containing redox groups and flexible macromolecular monomers are added to an organic solvent, and after passing an inert gas through, free radical solution polymerization is carried out at 50~90°C to obtain an acrylate copolymer solution containing the acrylate copolymer matrix. S2. Add a solid polymer electrolyte phase to the acrylate copolymer solution and mix to obtain a first mixed system; S3. Add inorganic dielectric-coated high-dielectric inorganic particles to the first mixed system and disperse them to obtain a second mixed system; S4. Add a crosslinking agent to the second mixture system, and obtain an electro-tack-reducing pressure-sensitive adhesive after degassing.

10. An application of the electro-adhesive tape as described in any one of claims 6 to 8, characterized in that, For detachable bonding scenarios, the application method includes: bonding the electro-adhesive pressure-sensitive adhesive layer of the electro-adhesive tape to a first substrate, bonding the conventional pressure-sensitive adhesive layer to a second substrate, electrically connecting the first comb electrode and the second comb electrode to an external DC power supply, applying a DC voltage of 1~60V for 0.5~300s, and then performing a peeling operation.

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