Electrically viscosity-reducing adhesive, adhesive tape and preparation method thereof

Abstract

The invention relates to the technical field of adhesives, in particular to an electric viscosity-reducing adhesive, an adhesive tape and a preparation method of the adhesive. Comprising the following steps: mixing and stirring an acrylate polymer, a curing agent, an auxiliary agent and a solvent to obtain electric viscosity-reducing glue; and coating the glue on the upper surface and the lower surface of an aluminum foil base material, baking at 110-150 DEG C for 3-5 minutes to obtain a conductive adhesive layer, and compounding two sides of an adhesive surface by using a release-treated film material to obtain the electric viscosity-reducing adhesive tape. The electric viscosity-reducing adhesive tape provided by the invention has both stripping performance and bonding strength, can keep the viscosity-reducing state of the adhesive tape for a long time, and meets the requirement of a small-batch disassembly process.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and specifically to an electro-detackifying adhesive, a tape and a preparation method thereof. Background Art

[0002] Detackifying adhesives are often used in the manufacturing process of electronic components to meet the requirements of yield and reprocessing; they have high bonding performance before detackifying, and during the disassembly process, the adhesive quickly loses its viscosity through light, heat and other treatment methods, so as to achieve separation from the adherend, and no residual adhesive remains on the adherend.

[0003] Traditional detackifying adhesives need to adjust the bonding strength of the detackifying adhesive through heat treatment or ultraviolet irradiation, but such methods have great limitations, especially not applicable to components with poor heat resistance or non-transparent components.

[0004] At present, there is also electro-detackifying adhesive technology in the market. After applying voltage on both sides of the metal substrate adhered by the adhesive, the adhesion of the bonded product can be rapidly reduced, so as to achieve rapid separation from the adherend; the electro-detackifying adhesive makes the ionic compounds in its components migrate directionally inside the colloid under the drive of the electric field, and finally enrich and arrange on the surfaces of the anode and cathode, and realize the effective overflow of some ionic compounds. However, after removing the electric field, the originally arranged ions will disperse and redistribute. Therefore, there is a certain operation time when using the electro-detackifying adhesive; if the operation time is too short, it will affect the effective removal of electronic components.

[0005] To solve the above problems, the present invention provides an electro-detackifying adhesive, a tape and a preparation method thereof. Summary of the Invention

[0006] The purpose of the present invention is to provide an electro-detackifying adhesive, a tape and a preparation method thereof to solve the problems raised in the above background art.

[0007] To solve the above technical problems, the present invention provides the following technical solution: An electro-detackifying adhesive, comprising raw materials in the following weight components: 10-50 parts of acrylate polymer, 1-10 parts of ionic liquid, 0.1-1 part of curing agent, 0.1-5 parts of auxiliary agent, 10-50 parts of organic solvent, 0.1-0.5 part of thermal initiator.

[0008] Preferably, at least one of the following conditions needs to be satisfied:

[0009] A. The resin solid content of the acrylate polymer is 10-50%; the weight average molecular weight is above 100,000 and below 3,000,000; the glass transition temperature of the acrylate polymer is below 0°C; the monomers of the acrylate polymer include short-chain alkyl acrylate monomers, long-chain alkyl acrylate monomers, polyether acrylate monomers, acidic vinyl monomers and other functional monomers;

[0010] B. The ionic liquid contains anions and cations. The cations include at least one of imidazolium-based cations, pyridinium-based cations, and ammonium-based cations; the anions are at least one of sulfonylimide-based, tetrafluoroborate-based, and dicyanamide-based anions.

[0011] C. The curing agent contains at least one of epoxy resin-based, isocyanate-based, carbodiimide-based, aziridine-based, or metal chelate-based compounds.

[0012] D. The auxiliary agent contains at least one of a leveling agent, a defoaming agent, an antioxidant, a heat stabilizer, and a metal corrosion inhibitor.

[0013] E. The solvent contains at least one of ester-based, ketone-based, and alcohol-based solvents.

[0014] More preferably, the short-chain alkyl acrylate monomer is at least one of ethyl acrylate and butyl acrylate;

[0015] The long-chain alkyl acrylate monomer is at least one of isooctyl acrylate, lauryl acrylate, and stearyl acrylate;

[0016] The polyether acrylate monomer is at least one of diethylene glycol acrylate, triethylene glycol acrylate, and tetraethylene glycol acrylate;

[0017] The acidic vinyl monomer is at least one of acrylic acid and methacrylic acid.

[0018] More preferably, other functional monomers include at least one of isobornyl (meth)acrylate, 1-adamantyl (meth)acrylate, 4-tert-butylcyclohexyl acrylate, and cyclohexyl (meth)acrylate.

[0019] More preferably, the mass ratio of the short-chain alkyl acrylate monomer, the long-chain polyether acrylate monomer, the acidic vinyl monomer, and other functional monomers is 60-85:5-15:2-5:5-10.

[0020] More preferably, the thermal initiator includes at least one of azo compounds, persulfate compounds, or peroxide compounds; the weight-average molecular weight of the acrylate polymer is above 200,000 and below 2,000,000; the glass transition temperature is below -15°C.

[0021] More preferably, the weight-average molecular weight of the acrylate polymer is above 300,000 and below 1,000,000; the glass transition temperature is below -25°C.

[0022] The present invention provides a preparation method of an electro-detackifying adhesive for any one of the above electro-detackifying adhesives. When preparing the electro-detackifying adhesive, the following steps are included: taking the required monomers, thermal initiator and organic solvent and mixing them, stirring at 60-75 °C for 1-4 h under the protection of a nitrogen atmosphere, cooling to room temperature, and then adding an ionic liquid, an auxiliary agent and an organic solvent thereto to obtain the electro-detackifying adhesive.

[0023] The present invention provides an electro-detackifying tape containing any one of the above electro-detackifying adhesives. The electro-detackifying tape is a single-sided tape or a double-sided tape;

[0024] When the electro-detackifying tape is a double-sided tape, it includes a first release film layer, a first electro-detackifying adhesive layer, a substrate layer, a second electro-detackifying adhesive layer, and a second release film layer from top to bottom;

[0025] The first release film layer is a polyethylene terephthalate release film layer, and the thickness is 20-45 μm;

[0026] The thickness of the first electro-detackifying adhesive layer is 50-70 μm; the thickness of the second electro-detackifying adhesive layer is 50-70 μm;

[0027] The thickness of the substrate layer is 15-25 μm.

[0028] The present invention also provides a preparation method of an electro-detackifying tape. When preparing the above electro-detackifying tape and preparing a double-sided tape, the electro-detackifying adhesive is coated on the upper and lower surfaces of the substrate, baked at 110-150 °C for 3-5 min to obtain a first electro-detackifying adhesive layer and a second electro-detackifying adhesive layer respectively; then the first release film is adhered to the surface of the first electro-detackifying adhesive, and the second release film is adhered to the surface of the second electro-detackifying adhesive to obtain the tape.

[0029] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0030] (1) Through the collaborative design of raw materials such as acrylate polymers, ionic liquids and auxiliary agents, the electro-detackifying adhesive provided by the present invention can make the whole composition have excellent peel strength and adhesion retention before electrification. After electrification, it can be peeled off from the adherend without residual glue. After the power supply is removed at the end of electrification, the composition can still maintain the detackifying effect for a long time. Compared with the existing products, the present invention extends the open time of the tape in the detackifying state, which is beneficial to the disassembly of single or small batches of electronic components.

[0031] (2) Through the synergistic cooperation of raw materials such as acrylate polymers with special structures, ionic liquids and curing agents, the tape prepared from the electro-detackifying adhesive of the present invention has a high peel strength before electrification, is easy to peel off from the adherend after electrification, and maintains a long detackifying state after the power supply is removed, which is convenient for batch operation and repair. Brief Description of the Drawings

[0032] Figure 1 It is a structural diagram of the tape prepared by the present invention.

[0033] Among them, 1 is the first release film layer; 2 is the first electro-decreasing tack adhesive layer; 3 is the conductive substrate layer; 4 is the second electro-decreasing tack adhesive layer; 5 is the second release film layer. Detailed Description of the Invention

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The materials, reagents, etc. used in the present invention can be obtained from commercial channels without special instructions.

[0036] Example 1

[0037] Prepare an acrylate polymer: Put 70 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, 10 parts of diethylene glycol acrylate, and 5 parts of isobornyl methacrylate into a four-necked flask, and add 120 parts of a mixed solution of ethyl acetate and 30 parts of methyl ethyl ketone. Stir for 1 h under nitrogen atmosphere to mix all materials evenly; then add 0.3 part of thermal initiator azobisisobutyronitrile, and then heat the mixed solution to 75 - 80 °C and react for 6 h to obtain an acrylate polymer A1 with a solid content of 40% and a weight average molecular weight of 30 - 40 w.

[0038] Prepare an electro-decreasing tack adhesive: Mix 100 parts of acrylate polymer A1, 0.5 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone evenly at high speed (1000 - 3000 r / min) at room temperature, and defoam to obtain the target adhesive.

[0039] Example 2

[0040] Prepare an electro-decreasing tack adhesive: Mix 100 parts of acrylate polymer A1, 0.3 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone evenly at high speed at room temperature, and defoam to obtain the target adhesive.

[0041] Example 3

[0042] Preparation of electro-decreasing viscosity adhesive: 100 parts of acrylate polymer A1, 0.1 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and defoamed to obtain the target adhesive.

[0043] Example 4

[0044] Preparation of acrylate polymer: 70 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, 10 parts of diethylene glycol acrylate, and 5 parts of cyclohexyl methacrylate are put into a four-necked flask, and 120 parts of ethyl acetate and 30 parts of methyl ethyl ketone mixed solution are added. Under the protection of nitrogen atmosphere, stir for 1 h to make all materials mixed uniformly; then add 0.3 part of thermal initiator azobisisobutyronitrile, and then heat the mixed solution to 75-80 °C and react for 6 h to obtain an acrylate polymer A2 with a solid content of 40% and a weight average molecular weight of 30-40 w.

[0045] Preparation of electro-decreasing viscosity adhesive: 100 parts of acrylate polymer A2, 0.1 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and defoamed to obtain the target adhesive.

[0046] Example 5

[0047] Preparation of acrylate polymer: 70 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, 10 parts of diethylene glycol acrylate, and 5 parts of 1-adamantyl methacrylate are put into a four-necked flask, and 120 parts of ethyl acetate and 30 parts of methyl ethyl ketone mixed solution are added. Under the protection of nitrogen atmosphere, stir for 1 h to make all materials mixed uniformly; then add 0.3 part of thermal initiator azobisisobutyronitrile, and then heat the mixed solution to 75-80 °C and react for 6 h to obtain an acrylate polymer A3 with a solid content of 40% and a weight average molecular weight of 30-40 w.

[0048] Preparation of electro-decreasing viscosity adhesive: 100 parts of acrylate polymer A3, 0.1 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and defoamed to obtain the target adhesive.

[0049] Example 6

[0050] Preparation of acrylate polymer: 70 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, 10 parts of diethylene glycol acrylate, and 5 parts of 4-tert-butylcyclohexyl acrylate were put into a four-necked flask. 120 parts of a mixed solution of ethyl acetate and 30 parts of methyl ethyl ketone were added, and the mixture was stirred for 1 h under nitrogen atmosphere to make all the materials evenly mixed. Subsequently, 0.3 part of thermal initiator azobisisobutyronitrile was added, and then the mixed solution was heated to 75 - 80 °C and reacted for 6 h to obtain acrylate polymer A4 with a solid content of 40% and a weight average molecular weight of 30 - 40 w.

[0051] Preparation of electro-viscosity-reducing adhesive: 100 parts of acrylate polymer A4, 0.1 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of methyl ethyl ketone were mixed evenly at high speed at room temperature, and the target adhesive could be obtained after defoaming.

[0052] Example 7

[0053] Preparation of electro-viscosity-reducing adhesive: 100 parts of acrylate polymer A1, 0.5 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of methyl ethyl ketone were mixed evenly at high speed at room temperature, and the target adhesive could be obtained after defoaming.

[0054] Example 8

[0055] Preparation of electro-viscosity-reducing adhesive: 100 parts of acrylate polymer A1, 0.3 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of methyl ethyl ketone were mixed evenly at high speed at room temperature, and the target adhesive could be obtained after defoaming.

[0056] Example 9

[0057] Preparation of electro-viscosity-reducing adhesive: 100 parts of acrylate polymer A1, 0.1 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of methyl ethyl ketone were mixed evenly at high speed at room temperature, and the target adhesive could be obtained after defoaming.

[0058] Example 10

[0059] Preparation of electro-viscosity-reducing adhesive: 100 parts of acrylate polymer A1, 0.1 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(trifluoromethylsulfonyl)imide, and 200 parts of methyl ethyl ketone were mixed evenly at high speed at room temperature, and the target adhesive could be obtained after defoaming.

[0060] Example 11

[0061] Preparation of acrylate polymer: Put 65 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, 10 parts of diethylene glycol acrylate, and 10 parts of isobornyl methacrylate into a four-necked flask. Then add 120 parts of a mixed solution of ethyl acetate and 30 parts of butanone. Stir for 1 h under the protection of a nitrogen atmosphere to mix all the materials evenly. Subsequently, add 0.3 part of the thermal initiator azobisisobutyronitrile, and then heat the mixed solution to 75 - 80 °C and react for 6 h to obtain an acrylate polymer A5 with a solid content of 40% and a weight-average molecular weight of 30 - 40 w.

[0062] Preparation of electro-viscosity reducing adhesive: Mix 100 parts of acrylate polymer A5, 0.1 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of butanone evenly at high speed at room temperature, and then defoam to obtain the target adhesive.

[0063] Comparative Example 1

[0064] Preparation of acrylate polymer: Put 75 parts of n-butyl acrylate, 10 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 part of 2-hydroxyethyl methacrylate, and 10 parts of diethylene glycol acrylate into a four-necked flask. Then add 120 parts of a mixed solution of ethyl acetate and 30 parts of butanone. Stir for 1 h under the protection of a nitrogen atmosphere to mix all the materials evenly. Subsequently, add 0.3 part of the thermal initiator azobisisobutyronitrile, and then heat the mixed solution to 75 - 80 °C and react for 6 h to obtain an acrylate polymer B1 with a solid content of 40% and a weight-average molecular weight of 30 - 40 w.

[0065] Preparation of electro-viscosity reducing adhesive: Mix 100 parts of acrylate polymer B1, 0.5 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of butanone evenly at high speed at room temperature, and then defoam to obtain the target adhesive.

[0066] Comparative Example 2

[0067] Preparation of electro-viscosity reducing adhesive: Mix 100 parts of acrylate polymer B1, 0.3 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt, and 200 parts of butanone evenly at high speed at room temperature, and then defoam to obtain the target adhesive.

[0068] Comparative Example 3

[0069] Preparation of electro-debonding adhesive: 100 parts of acrylate polymer B1, 0.1 part of epoxy curing agent AG602, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and degassed to obtain the target adhesive.

[0070] Comparative Example 4

[0071] Preparation of electro-debonding adhesive: 100 parts of acrylate polymer B1, 0.5 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and degassed to obtain the target adhesive.

[0072] Comparative Example 5

[0073] Preparation of electro-debonding adhesive: 100 parts of acrylate polymer B1, 0.3 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and degassed to obtain the target adhesive.

[0074] Comparative Example 6

[0075] Preparation of electro-debonding adhesive: 100 parts of acrylate polymer B1, 0.1 part of carbodiimide curing agent Hymax220, 5 parts of ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 200 parts of methyl ethyl ketone are mixed uniformly at high speed at room temperature, and degassed to obtain the target adhesive.

[0076] It should be noted that the acrylate monomers used in the above examples are all sourced from Satellite Petrochemical; the ionic liquid 1-methyl-3-ethylimidazolium bis(fluorosulfonyl)imide salt and 1-methyl-3-ethylimidazolium bis(trifluoromethylsulfonyl)imide are both sourced from Landi Technology; the thermal initiator azobisisobutyronitrile is obtained commercially; the epoxy curing agent AG602 is sourced from Huayi Resin; the carbodiimide curing agent Hymax220 is sourced from Langyi New Materials.

[0077] To verify the performance of the electro-debonding adhesives in each example and comparative example, the adhesives in the above examples and comparative examples were made into tape products in the present invention, and the preparation process is as follows:

[0078] The electro-debonding adhesives prepared in the examples and comparative examples were respectively coated on a polyethylene terephthalate film (thickness 50 μm) with a surface release treatment, dried at 130 °C for 5 minutes to obtain an adhesive layer with a thickness of 50 μm, and a polyethylene terephthalate film with a surface release treatment was further laminated on the surface of the adhesive layer, and then placed at 50 °C for 3 days for curing to obtain the tape products.

[0079] The tape products made of the electro-reducing viscoadhesive in each example and comparative example were subjected to performance tests respectively.

[0080] The test methods include:

[0081] Test of initial peel strength: Prepare 3 specimens of 25mm * 100mm; Peel off the release film on one side, bond the pressure-sensitive adhesive surface to the aluminum foil, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles; Peel off the release film on the other side, bond the other side of the pressure-sensitive adhesive to the stainless steel plate, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles, and let it stand at room temperature for 30min. Fix one end of the steel plate on the lower fixture of the tensile machine and keep it perpendicular to the horizontal plane. After zeroing the equipment reading, test the 180° peel force at a peel force test speed of 300mm / min; Take the average value of the test with a stable length of 50mm as the corresponding peel force.

[0082] Test of peel strength after electrification: Prepare 3 specimens of 25mm * 100mm; Peel off the release film on one side, bond the pressure-sensitive adhesive surface to the aluminum foil, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles; Peel off the release film on the other side, bond the other side of the pressure-sensitive adhesive to the stainless steel plate, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles, and let it stand at room temperature for 30min. Fix one end of the steel plate on the lower fixture (plastic type, insulation protection) of the tensile machine and keep it perpendicular to the horizontal plane. Fix the positive pole of the 30V DC power supply on the aluminum foil and the negative pole on the stainless steel plate. After 30S of electrification, remove the power supply. After zeroing the equipment reading, test the 180° peel force at a peel force test speed of 300mm / min; Take the average value of the test with a stable length of 50mm as the corresponding peel force.

[0083] Peeling strength test after a specific placement time after power-off: Prepare 3 specimens of 25mm * 100mm; Peel off the release film on one side, bond the pressure-sensitive adhesive surface to the aluminum foil, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles; Peel off the release film on the other side, bond the other side of the pressure-sensitive adhesive to the stainless steel plate, and roll it with a 2kg roller at a speed of 300mm / min for 2 - 3 passes. During the operation, pay attention to avoiding air bubbles and wrinkles, and let it stand at room temperature for 30min. Fix one end of the steel plate on the lower fixture (plastic type, insulation protection) of the tensile machine and keep it perpendicular to the horizontal plane. Fix the positive pole of the 30V DC power supply on the aluminum foil and the negative pole on the stainless steel plate. After power-on for 30S, remove the power supply, let it stand for 1min and 2min respectively. After zeroing the equipment reading, test the 180° peeling force at a peeling force test speed of 300mm / min; Take the average value of the test with a stable length of 50mm as the corresponding peeling force.

[0084] The test results of the tape products prepared from the electro-detackifying adhesives in each example and comparative example are shown in Table 1.

[0085] Table 1 Test results of tape products prepared from electro-detackifying adhesives in each example and comparative example

[0086]

[0087] Combined with the analysis of the examples and comparative examples in Table 1, it can be seen that by adding an appropriate amount of functional monomers with a large steric hindrance and controlling the crosslinking degree of the system, the detackifying state of the product after power-on can be extended; Excessive crosslinking degree and excessive introduction of high steric hindrance monomers will affect the initial peeling force, peeling force after detackification, and the retention time of the detackifying state of the tape product.

[0088] In summary, the electro-detackifying adhesive provided by the embodiments of the present application is prepared by the synergistic cooperation of raw materials such as acrylate polymers with special structures, ionic liquids, and curing agents. The tape prepared from the electro-detackifying adhesive has a high peeling strength before power-on, is easy to peel from the adherend after power-on, and maintains a long detackifying state after removing the power supply, which is convenient for batch operation and repair.

[0089] The above-described technical features can be combined arbitrarily. Although all possible combinations of these technical features have not been described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0090] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included within the patent protection scope of the present invention.

Claims

1. An electro-decreased viscosity adhesive, characterized in that, Raw materials including the following weight components: 10 - 50 parts of acrylate polymer, 1 - 10 parts of ionic liquid, 0.1 - 1 part of curing agent, 0.1 - 5 parts of auxiliary agent, 10 - 50 parts of organic solvent, 0.1 - 0.5 part of thermal initiator.

2. The electro-debonding adhesive according to claim 1, characterized in that, The following at least one condition should be satisfied: A. The resin solid content of the acrylate polymer is 10 - 50%; the weight - average molecular weight is above 100,000 and below 3,000,000; the glass transition temperature of the acrylate polymer is below 0 °C; the monomers of the acrylate polymer include short - chain alkyl acrylate monomers, long - chain alkyl acrylate monomers, polyether acrylate monomers, acidic vinyl monomers and other functional monomers; B. The ionic liquid contains anions and cations, and the cations include at least one of imidazolium - based cations, pyridinium - based cations and ammonium - based cations; the anions are at least one of sulfonylimide - based, tetrafluoroborate - based and dicyanamide - based; C. The curing agent contains at least one of epoxy resins, isocyanates, carbodiimides, aziridines or metal chelates; D. The auxiliary agent contains at least one of leveling agents, defoaming agents, antioxidants, heat stabilizers, metal corrosion inhibitors; E. The solvent contains at least one of esters, ketones and alcohol solvents.

3. The electro-debonding adhesive according to claim 2, characterized in that: The short - chain alkyl acrylate monomer is at least one of ethyl acrylate and butyl acrylate; The long - chain alkyl acrylate monomer is at least one of isooctyl acrylate, lauryl acrylate and stearyl acrylate; The polyether acrylate monomer is at least one of diethylene glycol acrylate, triethylene glycol acrylate and tetraethylene glycol acrylate; The acidic vinyl monomer is at least one of acrylic acid and methacrylic acid.

4. The electro-debonding adhesive according to claim 2, characterized in that: The other functional monomers include at least one of (meth)acryloyl isobornyl ester, 1 - adamantyl (meth)acrylate, 4 - tert - butylcyclohexyl acrylate, (meth)cyclohexyl acrylate.

5. The electro-viscous adhesive according to claim 3 or 4, characterized in that: The mass ratio of the short - chain alkyl acrylate monomer, long - chain polyether - bond acrylate monomer, acidic vinyl monomer and other functional monomers is 60 - 85:5 - 15:2 - 5:5 - 10.

6. The electro-viscous adhesive according to claim 5, characterized in that: The thermal initiator includes at least one of azo compounds, persulfate compounds or peroxide compounds; the weight - average molecular weight of the acrylate polymer is above 200,000 and below 2,000,000; the glass transition temperature is below - 15 °C.

7. The electro-viscous adhesive according to claim 6, characterized in that: The weight - average molecular weight of the acrylate polymer is above 300,000 and below 1,000,000; the glass transition temperature is below - 25 °C.

8. A preparation method of an electro-debonding adhesive, which is used to prepare any one of the electro-debonding adhesives described in claims 1 to 4, 6 or 7, characterized in that, When preparing the electro - reducing adhesive, the following steps are included: take the required monomers, thermal initiator and organic solvent and mix them, under the protection of nitrogen atmosphere, stir at 60 - 75 °C for 1 - 4 h, cool to room temperature, and then add ionic liquid, auxiliary agent and organic solvent to obtain the electro - reducing adhesive.

9. An electro-debonding tape contains any one of the electro-debonding adhesives described in claims 1 to 4, 6 or 7, characterized in that: The electro - reducing tape is a single - sided tape or a double - sided tape; When the electro - reducing tape is a double - sided tape, from top to bottom, it includes a first release film layer, a first electro - reducing adhesive layer, a substrate layer, a second electro - reducing adhesive layer, and a second release film layer; The first release film layer is a polyethylene terephthalate release film layer, and the thickness is 20 - 45 μm; The thickness of the first electro-reducing adhesive layer is 50 - 70 μm; the thickness of the second electro-reducing adhesive layer is 50 - 70 μm; The thickness of the substrate layer is 15 - 25 μm.

10. A method for preparing an electrically pressure-sensitive adhesive tape, which is used to prepare an electrically pressure-sensitive adhesive tape as shown in claim 9, characterized in that: When preparing the double-sided tape, coat the electro-reducing adhesive on the upper and lower surfaces of the substrate, and bake at 110 - 150 °C for 3 - 5 min to obtain the first electro-reducing adhesive layer and the second electro-reducing adhesive layer respectively; then attach the first release film to the surface of the first electro-reducing adhesive, and attach the second release film to the surface of the second electro-reducing adhesive to obtain the tape.

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