Electrolytic adhesive and adhesive tape and preparation method thereof

Abstract

The invention discloses an electrolytic adhesive, an adhesive tape and a preparation method thereof, and relates to the technical field of adhesives, the electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 2-10 parts of an auxiliary agent, 3-5 parts of bis (1-vinyl imidazole-2-) ketone, 0.5-1 part of an initiator, and 80-120 parts of a diluent; the main body of the adhesive is an ionomer; monomers for synthesizing the ionomer comprise a short-chain alkyl acrylate monomer, a long-chain alkyl acrylate monomer, an acrylic polyether bond ester monomer, an acidic vinyl monomer and other monomers. The electrolytic adhesive is good in storage stability, high in adhesion before electrification, easy to strip after electrification, good in weather resistance and moisture resistance, still high in stripping force after one-time adhesion, and good in restorability.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to an electrolytic adhesive and an adhesive tape and a preparation method thereof. Background Art

[0002] In modern industrial production and daily life, electrolytic adhesives and electrolytic adhesive tapes are widely used in the 3C electronics field due to their unique electrical response peeling properties. These materials can achieve fast and clean peeling after applying voltage, which provides great convenience for equipment maintenance, replacement and assembly. However, traditional electrolytic adhesives often rely on the addition of ionic liquids to enhance their electrolytic performance and peeling effect, which to some extent limits their application scope and use environment.

[0003] Although ionic liquids play an important role in improving the conductivity and peelability of electrolytic adhesives, their stability in high temperature and high humidity environments has become an urgent problem to be solved. Under high temperature and high humidity conditions, ionic liquids are prone to migration, resulting in a significant decrease in the weather resistance and moisture resistance of electrolytic adhesives, which in turn affects their bonding performance and electrolytic peeling effect. In addition, the migration of ionic liquids may also cause electrochemical corrosion inside the material, posing a potential threat to the long-term reliability and safety of the equipment.

[0004] In response to the above problems, the industry has been exploring new solutions in order to improve the weather resistance and moisture resistance of electrolytic adhesives while maintaining their high adhesion and easy peeling properties. Among them, improving the chemical composition of the adhesive body has become an important research direction. For example, the Chinese invention patent with application publication number CN118956301A discloses an electrolytic adhesive containing a stable polymer and a preparation method thereof, which is composed of the following raw materials in parts by weight: 1 part of polymer, 0.01-0.15 parts of cross-linking agent and 0.0001-0.1 parts of anti-corrosion agent; the polymer is a polymer containing anions, cations and liquid crystal monomers obtained by directly block copolymerizing acrylic monomers, ionic liquids and liquid crystal monomers; the electrolytic adhesive containing a stable polymer prepared by the invention has a large initial peel force, a small peel force after applying voltage, and good stability in a hot and humid environment. However, the weather resistance and moisture resistance of the electrolytic adhesive still need to be further improved; after one bonding, the peeling force of the electrolytic adhesive decreases significantly, and the recovery needs to be further improved.

[0005] It can be seen that the development of an electrolytic adhesive and tape with good storage stability, high adhesion before power-on, easy peeling after power-on, good weather resistance and moisture resistance, high peeling force after one bonding, and good recovery, as well as a preparation method thereof, meets market demand and is of great significance to promoting the development of the electrolytic adhesive field. Summary of the invention

[0006] The main purpose of the present invention is to provide an electrolytic adhesive and tape with good storage stability, high adhesion before power-on, easy peeling after power-on, good weather resistance and moisture resistance, high peeling force after one bonding, and good recovery, and a preparation method thereof.

[0007] To achieve the above purpose, the present invention provides an electrolytic adhesive, which includes the following raw material components by weight: 100 parts of an adhesive body, 2-10 parts of an auxiliary agent, 3-5 parts of di(1-vinylimidazole-2-)ketone, 0.5-1 part of an initiator, and 80-120 parts of a diluent; the adhesive body is an ionomer; and the monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0008] Preferably, the short-chain alkyl acrylate monomer is butyl acrylate.

[0009] Preferably, the long-chain alkyl acrylate monomer is isooctyl methacrylate.

[0010] Preferably, the acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate.

[0011] Preferably, the acidic vinyl monomer is at least one of acrylic acid, vinyl sulfonic acid, vinyl phosphonic acid, and 2-acrylamido-2-methylpropanesulfonic acid.

[0012] Preferably, the other monomer is at least one of vinylboronic acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine.

[0013] Preferably, the auxiliary agent is polyethylene glycol 200.

[0014] Preferably, the initiator is azobisisobutyronitrile.

[0015] Preferably, the diluent is a mixture of isooctyl acrylate and styrene in a mass ratio of (1-2):1.

[0016] Preferably, the mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer, and other monomers is 28:3:6:4.1:2.

[0017] Another object of the present invention is to provide a method for preparing the electrolytic adhesive, comprising the following steps: uniformly mixing the monomers, initiators and diluents for preparing the adhesive body, stirring the reaction at 50-65° C. in a nitrogen atmosphere for 1-3 hours, cooling to room temperature, adding an auxiliary agent and bis(1-vinylimidazole-2-)ketone thereto, and stirring to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and after the neutralization reaction is completed, the electrolytic adhesive of the present invention is obtained.

[0018] Preferably, the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal.

[0019] Preferably, the imidazolium bicarbonate is at least one of 1-ethyl-3-methylimidazolium bicarbonate, 1-butyl-3-methylimidazolium bicarbonate, and 1,3-dimethylimidazolium bicarbonate.

[0020] Another object of the present invention is to provide an adhesive tape made of the above-mentioned electrolytic adhesive, which comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer.

[0021] Preferably, both the first release film and the second release film are polyimide release films; the thickness of the first release film layer is 15-28 μm; the thickness of the second release film layer is 15-28 μm.

[0022] Preferably, the thickness of the first electrolytic adhesive layer is 5-12 μm; the thickness of the second electrolytic adhesive layer is 5-12 μm.

[0023] Preferably, the conductive substrate is an aluminum foil substrate.

[0024] Another object of the present invention is to provide a method for preparing the tape, comprising the following steps: applying an electrolytic adhesive to the upper and lower surfaces of a conductive substrate, drying at 75-85°C for 10-15 minutes to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film to the upper surface of the first electrolytic adhesive layer, and laminating a second release film to the lower surface of the second electrolytic adhesive layer to obtain a tape.

[0025] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The preparation method of the electrolytic adhesive and the tape disclosed in the present invention is convenient to prepare, shortens the preparation time, reduces the economic cost of the process flow, and can realize the lightweight and thinning of electronic products. It has low requirements on equipment and production lines, is suitable for industrial production, and has high promotion and application value.

[0026] (2) The electrolytic adhesive disclosed in the present invention comprises the following raw material components by weight: 100 parts of adhesive main body, 2-10 parts of auxiliary agent, 3-5 parts of di(1-vinyl imidazole-2-) ketone, 0.5-1 parts of initiator, and 80-120 parts of diluent; the adhesive main body is an ionomer; the monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers and other monomers; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene)-1,4-difluoro ... -1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and at least one of acryloylmorpholine; through the reasonable selection of the types and dosage ratios of each raw material component and monomer, the prepared electrolytic adhesive has good storage stability, high adhesion before power-on, easy peeling after power-on, good weather resistance and moisture resistance, and still has high peeling force after one bonding, and good recovery; by adding anionic acrylate copolymers and imidazolium cations to the main body of the adhesive, the additional addition of ionic liquids is avoided, and the migration of ionic liquids in high temperature and high humidity environments is prevented, thereby improving the weather resistance and moisture resistance of the electrolytic adhesive. It performs well in improving the storage performance of electrolytic adhesives in high temperature and high humidity environments, and after experiencing high temperature and high humidity conditions, the decrease in its adhesion before power-on is small.

[0027] (3) The electrolytic adhesive disclosed in the present invention, wherein the main body of the adhesive is an ionomer; the monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers and other monomers; the other monomers are at least one of vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole and acryloylmorpholine; wherein the short-chain alkyl acrylate monomer can improve flexibility, enhance adhesion and absorb fracture energy; the long-chain alkyl acrylate monomer can improve cohesion. Strength, increase the use temperature, enhance wear resistance; acrylic acid polyether ester monomer can improve fluidity and coating, enhance adhesion, and adjust the glass transition temperature; acid vinyl monomer can enhance adhesion, improve cohesive strength, and impart special reaction characteristics; other monomers can improve high temperature and high humidity resistance and weather resistance; through copolymerization to form ionomers, a variety of groups are introduced into its molecular structure at the same time. These structures and groups can effectively improve the comprehensive performance of electrolytic adhesives under the multiple effects of electronic effect, steric effect and conjugation effect, so that it has good storage stability, high adhesion before power-on, easy peeling after power-on, good weather resistance and moisture resistance, and still has high peeling force after one bonding, and good recovery.

[0028] (4) The adhesive tape disclosed in the present invention has a simple structure and preparation process, is easy to use, has no residual adhesive after peeling, and can effectively realize the repair or recycling of the bonded parts. DETAILED DESCRIPTION

[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations. Example 1

[0030] An electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 2 parts of an auxiliary agent, 3 parts of bis(1-vinylimidazole-2-)ketone, 0.5 parts of an initiator, and 80 parts of a diluent; the adhesive main body is an ionomer; monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0031] The short-chain alkyl acrylic acid ester monomer is butyl acrylate; the long-chain alkyl acrylic acid ester monomer is isooctyl methacrylate; the acrylic acid multi-ether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is acrylic acid; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine, which are mixed in a mass ratio of 1:1:2:2:1; the auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; and the diluent is isooctyl acrylate and styrene, which are mixed in a mass ratio of 1:1.

[0032] The mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer and other monomers is 28:3:6:4.1:2.

[0033] A preparation method of the electrolytic adhesive comprises the following steps: uniformly mixing monomers, initiators and diluents for preparing the adhesive body, stirring the mixture at 50°C for 1 hour in a nitrogen atmosphere, cooling the mixture to room temperature, adding an auxiliary agent and bis(1-vinyl imidazole-2-)ketone thereto, and stirring the mixture to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and obtaining the electrolytic adhesive of the present invention after neutralization reaction; the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; and the imidazolium bicarbonate is 1-ethyl-3-methylimidazole bicarbonate.

[0034] A tape made of the above-mentioned electrolytic adhesive comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 20 μm; the thickness of the second release film layer is 20 μm; the thickness of the first electrolytic adhesive layer is 8 μm; the thickness of the second electrolytic adhesive layer is 8 μm; the conductive substrate is an aluminum foil substrate with a thickness of 12 μm.

[0035] A method for preparing the adhesive tape comprises the following steps: coating an electrolytic adhesive on the upper and lower surfaces of a conductive substrate, drying at 75°C for 15 minutes to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film on the upper surface of the first electrolytic adhesive layer, and laminating a second release film on the lower surface of the second electrolytic adhesive layer to obtain the adhesive tape. Example 2

[0036] An electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 4 parts of an auxiliary agent, 3.5 parts of di(1-vinylimidazole-2-)ketone, 0.6 parts of an initiator, and 90 parts of a diluent; the adhesive main body is an ionomer; monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0037] The short-chain alkyl acrylate monomer is butyl acrylate; the long-chain alkyl acrylate monomer is isooctyl methacrylate; the acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is vinyl sulfonic acid; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine, which are mixed in a mass ratio of 2:1:3:2:1; the auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; the diluent is isooctyl acrylate and styrene, which are mixed in a mass ratio of 1.2:1; the mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer, and the other monomers is 28:3:6:4.1:2.

[0038] A method for preparing the electrolytic adhesive comprises the following steps: uniformly mixing monomers, initiators and diluents for preparing the adhesive body, stirring the mixture at 55°C for 1.5 hours in a nitrogen atmosphere, cooling the mixture to room temperature, adding an auxiliary agent and bis(1-vinyl imidazole-2-)ketone thereto, and stirring the mixture to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and obtaining the electrolytic adhesive of the present invention after the neutralization reaction is completed; the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; and the imidazolium bicarbonate is 1-butyl-3-methylimidazole bicarbonate.

[0039] A tape made of the above-mentioned electrolytic adhesive comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 20 μm; the thickness of the second release film layer is 20 μm; the thickness of the first electrolytic adhesive layer is 8 μm; the thickness of the second electrolytic adhesive layer is 8 μm; the conductive substrate is an aluminum foil substrate with a thickness of 12 μm.

[0040] A method for preparing the adhesive tape comprises the following steps: coating an electrolytic adhesive on the upper and lower surfaces of a conductive substrate, drying at 78°C for 13 minutes to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film on the upper surface of the first electrolytic adhesive layer, and laminating a second release film on the lower surface of the second electrolytic adhesive layer to obtain the adhesive tape. Example 3

[0041] An electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 7 parts of an auxiliary agent, 4 parts of bis(1-vinylimidazole-2-)ketone, 0.7 parts of an initiator, and 100 parts of a diluent; the adhesive main body is an ionomer; monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0042] The short-chain alkyl acrylate monomer is butyl acrylate; the long-chain alkyl acrylate monomer is isooctyl methacrylate; the acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is vinyl phosphonic acid; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine, which are mixed in a mass ratio of 1:3:5:2:3; the auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; the diluent is isooctyl acrylate and styrene, which are mixed in a mass ratio of 1.5:1; the mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer, and the other monomers is 28:3:6:4.1:2.

[0043] A method for preparing the electrolytic adhesive comprises the following steps: uniformly mixing monomers, initiators and diluents for preparing the adhesive body, stirring and reacting for 2 hours at 58° C. in a nitrogen atmosphere, cooling to room temperature, adding an auxiliary agent and bis(1-vinylimidazole-2-)ketone thereto, and stirring uniformly to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and after the neutralization reaction is completed, obtaining the electrolytic adhesive of the present invention; the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; and the imidazolium bicarbonate is 1,3-dimethylimidazole bicarbonate.

[0044] A tape made of the above-mentioned electrolytic adhesive comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 20 μm; the thickness of the second release film layer is 20 μm; the thickness of the first electrolytic adhesive layer is 8 μm; the thickness of the second electrolytic adhesive layer is 8 μm; the conductive substrate is an aluminum foil substrate with a thickness of 12 μm.

[0045] A method for preparing the adhesive tape comprises the following steps: applying an electrolytic adhesive to the upper and lower surfaces of a conductive substrate, drying at 80°C for 12 minutes, to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film to the upper surface of the first electrolytic adhesive layer, and laminating a second release film to the lower surface of the second electrolytic adhesive layer, to obtain the adhesive tape. Example 4

[0046] An electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 9 parts of an auxiliary agent, 4.5 parts of di(1-vinylimidazole-2-)ketone, 0.9 parts of an initiator, and 110 parts of a diluent; the adhesive main body is an ionomer; monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0047] The short-chain alkyl acrylic acid ester monomer is butyl acrylate; the long-chain alkyl acrylic acid ester monomer is isooctyl methacrylate; the acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is a mixture of acrylic acid, vinyl sulfonic acid, vinyl phosphonic acid, and 2-acrylamido-2-methylpropanesulfonic acid in a molar ratio of 1:2:2:1; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2 -propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine are mixed in a mass ratio of 1:2:1:1:1; the auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; the diluent is isooctyl acrylate and styrene are mixed in a mass ratio of 1.8:1; the mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer, and other monomers is 28:3:6:4.1:2.

[0048] A method for preparing the electrolytic adhesive comprises the following steps: uniformly mixing monomers, initiators and diluents for preparing the adhesive body, stirring and reacting for 2.5 hours at 63° C. in a nitrogen atmosphere, cooling to room temperature, adding an auxiliary agent and bis(1-vinyl imidazole-2-)ketone thereto, and stirring uniformly to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and after neutralization reaction, obtaining the electrolytic adhesive of the present invention; the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; the imidazolium bicarbonate is a mixture of 1-ethyl-3-methylimidazole bicarbonate, 1-butyl-3-methylimidazole bicarbonate and 1,3-dimethylimidazole bicarbonate in a molar ratio of 1:1:2.

[0049] A tape made of the above-mentioned electrolytic adhesive comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 20 μm; the thickness of the second release film layer is 20 μm; the thickness of the first electrolytic adhesive layer is 8 μm; the thickness of the second electrolytic adhesive layer is 8 μm; the conductive substrate is an aluminum foil substrate with a thickness of 12 μm.

[0050] A method for preparing the adhesive tape comprises the following steps: applying an electrolytic adhesive to the upper and lower surfaces of a conductive substrate, drying at 83°C for 11 minutes, to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film to the upper surface of the first electrolytic adhesive layer, and laminating a second release film to the lower surface of the second electrolytic adhesive layer, to obtain the adhesive tape. Example 5

[0051] An electrolytic adhesive comprises the following raw material components by weight: 100 parts of an adhesive main body, 10 parts of an auxiliary agent, 5 parts of di(1-vinylimidazole-2-)ketone, 1 part of an initiator, and 120 parts of a diluent; the adhesive main body is an ionomer; monomers for synthesizing the ionomer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, acrylic acid polyether bond ester monomers, acidic vinyl monomers, and other monomers.

[0052] The short-chain alkyl acrylate monomer is butyl acrylate; the long-chain alkyl acrylate monomer is isooctyl methacrylate; the acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is 2-acrylamido-2-methylpropanesulfonic acid; the other monomers are vinyl boric acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine, which are mixed in a mass ratio of 1:1:1:1:1; the auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; the diluent is isooctyl acrylate and styrene, which are mixed in a mass ratio of 2:1; the mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer, and the other monomers is 28:3:6:4.1:2.

[0053] A method for preparing the electrolytic adhesive comprises the following steps: uniformly mixing monomers, initiators and diluents for preparing the adhesive body, stirring and reacting for 3 hours at 65° C. in a nitrogen atmosphere, cooling to room temperature, adding an auxiliary agent and bis(1-vinyl imidazole-2-)ketone thereto, and stirring to obtain a mixed solution; adding imidazolium bicarbonate to the mixed solution, and after neutralization reaction, obtaining the electrolytic adhesive of the present invention; the molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; and the imidazolium bicarbonate is 1-ethyl-3-methylimidazole bicarbonate.

[0054] A tape made of the above-mentioned electrolytic adhesive comprises, from top to bottom, a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 20 μm; the thickness of the second release film layer is 20 μm; the thickness of the first electrolytic adhesive layer is 8 μm; the thickness of the second electrolytic adhesive layer is 8 μm; the conductive substrate is an aluminum foil substrate with a thickness of 12 μm.

[0055] A method for preparing the adhesive tape comprises the following steps: applying an electrolytic adhesive to the upper and lower surfaces of a conductive substrate, and drying at 85°C for 10 minutes to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer, respectively; then laminating a first release film to the upper surface of the first electrolytic adhesive layer, and laminating a second release film to the lower surface of the second electrolytic adhesive layer to obtain the adhesive tape.

[0056] Comparative Example 1 An electrolytic adhesive and tape and a preparation method thereof, which are substantially the same as those in Example 1, except that no other monomers are added.

[0057] Comparative Example 2 An electrolytic adhesive and tape and a preparation method thereof are basically the same as those in Example 1, except that an equal amount of divinylbenzene is used instead of bis(1-vinylimidazole-2-)ketone.

[0058] In order to further illustrate the beneficial technical effects of the electrolytic adhesive and tape involved in each embodiment of the present invention, relevant performance tests were conducted on the electrolytic adhesive tapes involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. The test method is as follows: Peel force before power on at room temperature [g / 25mm]: The sample size of the electrolytic adhesive tape is 25mm×100 mm. Tear off the first release film layer and stick it on a stainless steel plate with a sticking area of ​​25mm×25 mm. Use a 2kg pressure roller to roll back and forth 3 times at a speed of 120mm / s. Place it in an environment with room temperature and ambient humidity. After 30 minutes, test the 180° peel force on a tensile testing machine.

[0059] Peel force after power on at room temperature [g / 25mm]: The sample size of the electrolytic adhesive tape is 25 mm×100 mm. The first release film layer is torn off and applied to a stainless steel plate with an application area of ​​25 mm×25 mm. A 2 kg roller is used to roll back and forth 3 times at a speed of 120 mm / s. The environment is kept at room temperature and humidity. After 30 minutes, the positive pole of the DC power supply is connected to the conductive substrate, and the negative pole is connected to the stainless steel plate. A DC power of 15 V is applied for 20 seconds. After the power is applied, the 180° peel force is quickly tested on a tensile machine.

[0060] Peel force recovery rate [%]: After the peel force test after power-on at room temperature is completed, the electrolytic adhesive tape is peeled off the stainless steel plate, and then applied to the stainless steel plate again, and rolled back and forth 3 times at a speed of 120 mm / s with a 2 kg roller, and placed in an environment with room temperature and humidity; 30 min later, the 180° peel force at room temperature is tested again on the tensile testing machine, and the result is divided by the peel force after power-on at room temperature.

[0061] Peel force before power-on under high temperature and high humidity [g / 25mm]: The sample size of the electrolytic adhesive tape is 25mm×100mm. Tear off the first release film layer and stick it on a stainless steel plate with a sticking area of ​​25mm×25mm. Use a 2kg pressure roller to roll back and forth 3 times at a speed of 120 mm / s. The environment is 85℃ and 85% humidity. After 72 hours, test the 180° peel force on a tensile testing machine.

[0062] Peel force after power-on under high temperature and high humidity [g / 25mm]: The sample size of the electrolytic adhesive tape is 25mm×100mm. Tear off the first release film layer and stick it on a stainless steel plate with a sticking area of ​​25mm×25mm. Use a 2 kg roller to roll back and forth 3 times at a speed of 120 mm / s. Place it in an environment of 85℃ and 85% humidity. After 72 hours, connect the positive pole of the DC power supply to the conductive substrate and the negative pole to the stainless steel plate. Power is applied with a DC voltage of 15 V for 20 s. After the power-on is over, quickly test the 180° peel force on a tensile testing machine.

[0063] Table 1

[0064] As can be seen from Table 1, the electrolytic adhesive disclosed in the embodiment of the present invention has higher peeling force before power-on, better electrolytic bonding effect and recovery, and better moisture and heat resistance stability than the comparative example product; the combined use of other monomers and bis(1-vinylimidazole-2-)ketone is beneficial to improving the above properties.

[0065] The above shows and describes 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 above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrolytic adhesive, characterized in that: The raw material components are as follows: 100 parts of adhesive main body, 2-10 parts of auxiliary agent, 3-5 parts of bis(1-vinylimidazole-2-)ketone, 0.5-1 part of initiator, and 80-120 parts of diluent. The adhesive main body is ionomer. The monomers for synthesizing ionomer include short-chain alkyl acrylate monomer, long-chain alkyl acrylate monomer, acrylate polyether bond ester monomer, acid vinyl monomer and other monomers.

2. The electrolytic adhesive according to claim 1, characterized in that: The short-chain alkyl acrylate monomer is butyl acrylate; the long-chain alkyl acrylate monomer is isooctyl methacrylate.

3. The electrolytic adhesive according to claim 1, characterized in that: The acrylic acid polyether bond ester monomer is diethylene glycol ethyl ether acrylate; the acidic vinyl monomer is at least one of acrylic acid, vinyl sulfonic acid, vinyl phosphonic acid, and 2-acrylamido-2-methylpropane sulfonic acid.

4. The electrolytic adhesive according to claim 1, characterized in that: The other monomers are at least one of vinylboronic acid pinacol ester, methacrylate tricyclo[5.2.1.02,6]dec-8-yl ester, 3-(1,1-difluoro-2-propene-1-yl)-2(1H)-quinoxalinone, 4-methyl-5-vinylthiazole, and acryloylmorpholine.

5. The electrolytic adhesive according to claim 1, characterized in that: The auxiliary agent is polyethylene glycol 200; the initiator is azobisisobutyronitrile; and the diluent is a mixture of isooctyl acrylate and styrene in a mass ratio of (1-2):

1.

6. The electrolytic adhesive according to claim 1, characterized in that: The mass ratio of the short-chain alkyl acrylate monomer, the long-chain alkyl acrylate monomer, the acrylic acid polyether bond ester monomer, the acidic vinyl monomer and other monomers is 28:3:6:4.1:

2.

7. A method for preparing an electrolytic adhesive according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: uniformly mixing monomers, an initiator and a diluent for preparing an adhesive body, stirring and reacting for 1-3 hours at 50-65° C. in a nitrogen atmosphere, cooling to room temperature, adding an auxiliary agent and bis(1-vinylimidazole-2-)ketone thereto, and uniformly stirring to obtain a mixed solution; and adding imidazolium bicarbonate to the mixed solution, and after the neutralization reaction is completed, obtaining the electrolytic adhesive of the present invention.

8. The method for preparing the electrolytic adhesive according to claim 7, characterized in that: The molar numbers of the imidazolium bicarbonate and the acidic vinyl monomer are equal; the imidazolium bicarbonate is at least one of 1-ethyl-3-methylimidazole bicarbonate, 1-butyl-3-methylimidazole bicarbonate, and 1,3-dimethylimidazole bicarbonate.

9. An adhesive tape made of the electrolytic adhesive according to any one of claims 1 to 6, characterized in that: From top to bottom, it includes a first release film layer, a first electrolytic adhesive layer, a conductive substrate layer, a second electrolytic adhesive layer and a second release film layer; the first release film and the second release film are both polyimide release films; the thickness of the first release film layer is 15-28μm; the thickness of the second release film layer is 15-28μm; the thickness of the first electrolytic adhesive layer is 5-12μm; the thickness of the second electrolytic adhesive layer is 5-12μm; the conductive substrate is an aluminum foil substrate.

10. A method for preparing the adhesive tape according to claim 9, characterized in that: The method comprises the following steps: coating the electrolytic adhesive on the upper and lower surfaces of the conductive substrate, drying at 75-85°C for 10-15 minutes to obtain a first electrolytic adhesive layer and a second electrolytic adhesive layer respectively; then laminating the first release film on the upper surface of the first electrolytic adhesive layer, and laminating the second release film on the lower surface of the second electrolytic adhesive layer to obtain an adhesive tape.

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