Ionic liquid modified acrylate polymer, responsive electric visbreaking adhesive as well as preparation method and application of responsive electric visbreaking adhesive

Abstract

The invention provides an ionic liquid modified acrylate polymer, a responsive electric visbreaking adhesive as well as a preparation method and application of the responsive electric visbreaking adhesive. The ionic liquid modified acrylate polymer is prepared from the following components in parts by weight: 10 to 60 parts of long-chain alkyl acrylate, 10 to 40 parts of hydroxyl acrylate, 5 to 20 parts of acylamino acrylate, 5 to 20 parts of oxyalkyl acrylate, 1 to 10 parts of (methyl) acrylic acid / acryloyloxy carboxylic acid, 10 to 60 parts of epoxy acrylate and 0.5 to 5 parts of ionic liquid. According to the responsive electric visbreaking adhesive tape, the ionic liquid is grafted into an acrylate polymer skeleton through graft copolymerization, so that the prepared responsive electric visbreaking adhesive tape has relatively high drawing force and light transmittance, short electric visbreaking time and relatively low ionic liquid mobility.

Description

Technical Field

[0001] This invention belongs to the field of responsive electro-tack adhesive technology, and particularly relates to an ionic liquid modified acrylate polymer, a responsive electro-tack adhesive, its preparation method and application. Background Technology

[0002] With the rapid development of precision manufacturing fields such as semiconductor processing, flexible electronics assembly, and display panel manufacturing, new and higher requirements have been placed on bonding materials. In these precision manufacturing and assembly processes, bonding materials not only need to provide high-strength, high-reliability temporary fixation during processing to ensure that the adhered objects (such as wafers, chips, and flexible sensors) do not move during cutting, grinding, transportation, or inspection; more importantly, they must be able to achieve on-demand, targeted, rapid, and non-destructive peeling in subsequent processes. After peeling, the surface of the adhered objects should be clean and free of residue, and their physical and electrical properties should not be affected.

[0003] Traditional responsive adhesive tapes, such as heat-resistant and solvent-based tapes, can meet the above requirements. Heat-resistant tape technology relies on the adhesive undergoing a phase change or chemical degradation at a specific temperature, thus losing its adhesive strength. However, this technology requires heating the entire workpiece or a large area, causing heat-sensitive adhered materials (such as chips and flexible organic light-emitting diodes) to warp, be damaged, or experience performance degradation due to thermal stress. Furthermore, overall heating consumes high energy, and the heating and cooling processes are slow, affecting production efficiency. Simultaneously, the tape-off process is usually irreversible, making repeated bonding impossible. Solvent-based tape technology relies on the strong dissolving and diffusion capabilities of solvents to destroy the adhesive layer. Its controllability is poor, making it difficult to achieve precise tape-off at specific points. Additionally, the solvent may contaminate the workpiece or working environment, and the peeling process is also often irreversible.

[0004] To overcome the drawbacks of thermal and solvent responses, electro-reducing adhesive (or responsive electro-exfoliation) technology has emerged. A typical implementation of this technology involves physically blending ionic compounds (such as ionic liquids) into pressure-sensitive adhesives or structural adhesives, which then cure to form a composite adhesive film. When a DC voltage is applied between the electrodes at the bonding interface, ions in the adhesive layer undergo directional migration and initiate a series of electrochemical redox reactions at the interface. This leads to changes in the interface chemical composition, adhesion energy, or interface layer structure, thereby achieving a rapid and significant decrease in adhesive strength within a short time, completing the peeling process.

[0005] However, this type of electro-adhesion reduction technology based on physical blended ionic compounds has the following inherent defects: (1) Ion migration and residue problems: Under the drive of a DC electric field, anions and cations migrate directionally to the positive and negative electrodes, respectively. This process may not only cause electrode corrosion and side reactions, but more importantly, it will cause irreversible electrochemical reactions at the adhesive / substrate interface. After peeling, these chemical components are very likely to remain on the surface of precision devices. Such residues are the direct cause of device electrical performance failure, corrosion or a decrease in the yield of subsequent processes, and are especially unsuitable for semiconductor manufacturing processes that are extremely sensitive to ion contamination.

[0006] (2) Insufficient stability and durability: Physically doped ionic liquids and polymer matrices are only physically bonded and have limited compatibility. During long-term storage or in high temperature and high humidity environments, these ionic compounds are at risk of continuously migrating to the interface or surface and precipitating out. This not only leads to the premature decay of the initial bonding performance and cohesive strength of the adhesive, but also causes the loss of electro-tack reduction performance due to the loss of electro-signal responders, resulting in functional failure of the product.

[0007] (3) Poor uniformity and controllability of electric field response: In physical blending systems, the distribution of ionic liquids is often uneven, resulting in differences in conductivity within the adhesive film. When voltage is applied, the current tends to concentrate in low-resistance channels, causing uneven electric field distribution. After energizing the bonding surface, local overheating and excessive reaction may occur, while other areas may not react sufficiently, resulting in residual adhesive and local adhesion during large-area peeling, which seriously affects the consistency, controllability, and reliability of the peeling operation.

[0008] Therefore, there is an urgent need in the field to develop an electro-tack reducing adhesive that can integrate the electro-responsive properties of ionic liquids into the adhesive network through a stable chemical bonding method, thereby overcoming the various drawbacks caused by ion migration in the prior art and achieving faster, more uniform, pollution-free and repeatable electro-controlled peeling. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the present invention aims to provide an ionic liquid-modified acrylate polymer, a responsive electro-tack adhesive, its preparation method, and its application. The present invention grafts an ionic liquid into the acrylate polymer backbone through graft copolymerization to obtain an ionic liquid-modified acrylate polymer. The responsive electro-tack tape containing the polymer exhibits high pull-out strength and light transmittance, excellent weather resistance, short electro-tack reduction time, and low ionic liquid migration rate.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] In a first aspect, the present invention provides an ionic liquid-modified acrylate polymer, wherein the raw materials for preparing the ionic liquid-modified acrylate polymer comprise the following components by weight:

[0012] 10-60 parts of long-chain alkyl acrylates;

[0013] 10-40 parts of hydroxy acrylate;

[0014] 5-20 parts of amide acrylate;

[0015] 5-20 parts of oxyalkyl acrylate;

[0016] 1-10 parts of (meth)acrylic acid / acryloyloxycarboxylic acid;

[0017] 10-60 parts of epoxy acrylate;

[0018] 0.5-5 parts of ionic liquid;

[0019] 0.01-0.1 parts of relative molecular mass regulator;

[0020] 0.1-2 parts of thermal initiator;

[0021] Solvent 90-240 parts.

[0022] In this invention, long-chain alkyl acrylates enhance the toughness, impact resistance, and peel strength of the polymer. Simultaneously, as flexible segments, they maintain appropriate flexibility, facilitating tape debonding under electric field stimulation. Hydroxyl acrylates and amide acrylates, containing hydroxyl and amide groups respectively, can form hydrogen bonds with polar groups on the substrate surface, enhancing adhesion and significantly improving the polymer's cohesive strength and heat resistance through crosslinking. Oxyl acrylates improve the compatibility of components, enhance segment flexibility, and assist in electro-responsive behavior. (Meth)acrylic acid / acryloyloxycarboxylic acid, as basic monomers, constructs the polymer network structure, improving the polymer's strength and initial adhesion. Epoxy acrylates can undergo ring-opening polymerization to form a dense three-dimensional network structure, endowing the polymer with high modulus and excellent heat resistance, thus improving the polymer's structural strength.

[0023] This invention introduces ionic liquids into the acrylate polymer backbone via graft copolymerization, using chemical bonds to fix the ionic liquids to the polymer side chains. This avoids electrode corrosion, irreversible side reactions, and the residue of harmful chemicals on the surface of precision devices caused by the migration and acidification of free anions. Simultaneously, the graft copolymerization achieves a permanent bond between the ionic liquid and the matrix polymer, resulting in excellent stability. It completely eliminates the migration, precipitation, and loss of ionic liquids in physical blending systems, ensuring that the responsive electro-tack tape maintains high stability in both adhesive strength and electro-peel performance during long-term storage, aging, or humid and hot environments. Furthermore, the uniform distribution of the ionic liquid within the polymer matrix ensures the uniformity of the electric field distribution and conductive pathways, thereby achieving rapid and controllable peeling of the complete interface and avoiding residual adhesive or adhesion caused by localized overheating or uneven reactions.

[0024] This invention utilizes ionic liquid to graft copolymerize and modify acrylate polymers, resulting in a responsive electro-tack tape with high initial adhesion, excellent high temperature and weather resistance, high pull-out force and holding force, a wide current signal response window when current stimulation is applied, high sensitivity, fast response rate, rapid decrease in viscosity within a short time, complete interface separation after responsive de-tack, no residue, and low ion mobility.

[0025] The amount of the long-chain alkyl acrylate can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0026] The amount of the hydroxy acrylate can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, or 40 parts, etc.

[0027] The amount of the amide acrylate can be 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts or 20 parts, etc.

[0028] The amount of the oxyalkyl acrylate can be 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts or 20 parts, etc.

[0029] The amount of (meth)acrylic acid / acryloyloxycarboxylic acid used can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc.

[0030] The amount of the epoxy acrylate can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0031] The amount of the ionic liquid can be 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts, etc.

[0032] The amount of the relative molecular mass regulator can be 0.01 parts, 0.02 parts, 0.03 parts, 0.04 parts, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, or 0.1 parts, etc.

[0033] The amount of the thermal initiator can be 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, or 2 parts, etc.

[0034] The amount of solvent used can be 90 parts, 100 parts, 120 parts, 140 parts, 160 parts, 180 parts, 200 parts, 220 parts, or 240 parts, etc.

[0035] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0036] Preferably, the weight-average molecular weight of the ionic liquid-modified acrylate polymer is 700,000 to 900,000, for example, 700,000, 710,000, 720,000, 730,000, 740,000, 750,000, 760,000, 770,000, 780,000, 790,000, 800,000, 810,000, 820,000, 830,000, 840,000, 850,000, 860,000, 870,000, 880,000, 890,000, or 900,000.

[0037] Preferably, the molecular weight distribution (PDI) of the acrylate polymer is 8.5-10.5, such as 8.5, 8.7, 8.9, 9.1, 9.3, 9.5, 9.7, 9.9, 10.1, 10.3 or 10.5.

[0038] Preferably, the ionic liquid has the structure shown in Formula I, Formula II, or Formula III:

[0039] ;

[0040] Among them, R1, R2, R3, R5, R6, R7, R9, R 10Each of the groups is independently selected from hydrogen, C2-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, or C10) alkyl groups, C2-C10 alkyl groups in which one or more non-adjacent methylene groups are independently substituted with heteroatoms, and olefinically unsaturated polymerizable groups; the heteroatoms include at least one of oxygen or sulfur.

[0041] The olefinically unsaturated polymerizable group includes at least one of (meth)acryloyl, vinylbenzyl, or (meth)acrylamido.

[0042] In this invention, the (meth)acryloyl group includes acryloyl group and methacryloyl group, and the (meth)acrylamide group includes acrylamide group and methacrylamide group.

[0043] At least one substituent in Formulas I, II and III is selected from olefinically unsaturated polymerizable groups.

[0044] R4 and R8 are selected from carbon, and m and n are each an independent integer from 1 to 3, such as 1, 2 or 3.

[0045] The X m- Selected from Cl - ,Br - I - BF4 - PF6 - (CF3SO2)2N - CO3 2- CH3COO - SO4 2- CF3COO - CF3SO3 - SbF6 - FSO3 - CN - SCN - NO3 - NO2 - H2PO4 - PO4 3- HCO3 - HSO4 - SO3 2- AlCl4 - CH3CHOHCOO - NH2CH2COO - NCN2 - (C8F) 17 SO2)2N - (SO2F)2N - (C2F5SO2)2N -Or (C4F9SO2)(CF3SO2)N - Any one of them.

[0046] Preferably, the ionic liquid comprises any one or a combination of at least two of the following: 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (methacryloyloxyethyl)trimethylammonium bis(trifluoromethanesulfonyl)imide, 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate, 1-(acrylamidopropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (methacryloyloxyethyl)dimethyldodecylammonium bis(trifluoromethanesulfonyl)imide, or 1,3-bis(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide.

[0047] Preferably, the long-chain alkyl acrylate has a carbon number of C12-C30, such as C12, C14, C16, C18, C20, C22, C24, C26, C28 or C30.

[0048] Preferably, the long-chain alkyl acrylate includes any one or a combination of at least two of dodecyl acrylate, tridecyl acrylate, tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, isooctadecyl acrylate, or oleyl acrylate.

[0049] Preferably, the hydroxy acrylate includes any one or a combination of at least two of hydroxyethyl acrylate, β-hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, or hydroxymethylacrylamide.

[0050] Preferably, the amide acrylate comprises any one or a combination of at least two of N-acryloyloxyethylacrylamide, N-hydroxyethylacrylamide acrylate, N-isopropylacrylamide acrylate, diacetone acrylamide acrylate, N-vinylpyrrolidone acrylate, N-acryloylmorpholine acrylate, or N-acryloylcaprolactam acrylate.

[0051] Preferably, the alkyl acrylate comprises any one or a combination of at least two of the following: methoxyethyl acrylate, ethoxyethyl acrylate, propoxyethyl acrylate, butoxyethyl acrylate, 2-methoxypropyl acrylate, 2-ethoxypropyl acrylate, or trimethylolpropane triacrylate.

[0052] Preferably, the (meth)acrylic acid includes acrylic acid and / or methacrylic acid.

[0053] Preferably, the acryloyloxycarboxylic acid includes β-(acryloyloxy)propionic acid.

[0054] Preferably, the epoxy acrylate includes any one or a combination of at least two of glycidyl methacrylate, bisphenol A diglycidyl ether diacrylate, phenolic epoxy acrylate, or epoxy polyethylene glycol acrylate.

[0055] Preferably, the relative molecular mass regulator includes any one or a combination of at least two of the following: n-butanethiol, n-hexanethiol, n-dodecylthiol, tert-dodecylthiol, n-tetradecylthiol, benzenethiol, p-toluenethiol, 2,4-di-p-toluenethiol, 2-mercaptoethanol, or 3-mercaptopropionic acid.

[0056] Preferably, the thermal initiator comprises any one or a combination of at least two of the following: benzoyl peroxide, dicumyl peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, tert-butyl peroxide, tert-butyl hydroperoxide, azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azobiscyanopentanoic acid, potassium persulfate, or ammonium persulfate.

[0057] Preferably, the solvent includes any one or a combination of at least two of the following: methanol, ethanol, isopropanol, benzene, toluene, xylene, ethyl acetate, butyl acetate, acetone, butanone, cyclohexanone, diethyl ether, tetrahydrofuran, N,N-dimethylformamide, N,N-dimethylacetamide, dichloromethane, chloroform, carbon tetrachloride, or acetonitrile.

[0058] In a second aspect, the present invention provides a method for preparing an ionic liquid-modified acrylate polymer as described in the first aspect, the method comprising the following steps:

[0059] (1) Dissolve a portion of long-chain alkyl acrylate, a portion of hydroxy acrylate, a portion of amide acrylate, a portion of oxyalkyl acrylate, a portion of (meth)acrylic acid / acryloyloxycarboxylic acid and a portion of epoxy acrylate in a solvent, add a relative molecular mass regulator and a portion of thermal initiator, and react to obtain the acrylate polymer.

[0060] (2) Add the remaining long-chain alkyl acrylate, the remaining hydroxy acrylate, the remaining amide acrylate, the remaining alkyl acrylate, the remaining (meth)acrylic acid / acryloyloxycarboxylic acid, the remaining epoxy acrylate, the remaining solvent, the ionic liquid and the remaining thermal initiator to the acrylate polymer, and react to obtain the ionic liquid modified acrylate polymer.

[0061] Preferably, in step (1), the reaction temperature is 60-90℃, such as 60℃, 62℃, 64℃, 66℃, 68℃, 70℃, 72℃, 74℃, 76℃, 78℃, 80℃, 82℃, 84℃, 86℃, 88℃ or 90℃.

[0062] Preferably, in step (1), the reaction time is 2.5-3.5h, for example 2.5h, 3h or 3.5h.

[0063] Preferably, in step (2), the reaction temperature is 70-80℃, such as 70℃, 71℃, 72℃, 73℃, 74℃, 75℃, 76℃, 77℃, 78℃, 79℃ or 80℃.

[0064] Preferably, in step (2), the reaction time is 3-4 hours, such as 3 hours, 3.5 hours or 4 hours.

[0065] Thirdly, the present invention provides a responsive electro-tack reducing adhesive, the responsive electro-tack reducing adhesive comprising the ionic liquid modified acrylate polymer described in the first aspect.

[0066] Preferably, the responsive electro-tack adhesive comprises the following components by weight:

[0067] 80-120 parts of ionic liquid modified acrylate polymer;

[0068] 0.01-1 part of water-soluble polymer;

[0069] Hardener 0.5-1.2 parts;

[0070] Corrosion inhibitor 1-10 parts.

[0071] The amount of the acrylate polymer can be 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 106 parts, 108 parts, 110 parts, 112 parts, 114 parts, 116 parts, 118 parts, or 120 parts, etc.

[0072] The amount of the water-soluble polymer can be 0.01 parts, 0.05 parts, 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, or 1 part, etc.

[0073] The amount of the corrosion inhibitor can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, etc.

[0074] Preferably, the polymer monomers of the water-soluble polymer include any one or a combination of at least two of carboxyl-containing monomers, hydroxyl-containing monomers, ether-containing monomers, vinylpyrrolidone, or acrylamide.

[0075] Preferably, the curing agent comprises any one or a combination of at least two of the following: ethylenediamine, diethylenetriamine, m-phenylenediamine, phthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, polyamide, dicyandiamide, 2-methylimidazole, 2-ethyl-4-methylimidazole, hexamethylenetetramine, p-toluenesulfonic acid, phenolsulfonic acid, toluene diisocyanate, hexamethylene diisocyanate, or isophorone diisocyanate.

[0076] Fourthly, the present invention provides a responsive electro-adhesive tape, the responsive electro-adhesive tape comprising a release film layer A, an adhesive layer A, an aluminum foil Mylar substrate layer, an adhesive layer B, and a release film layer B arranged sequentially.

[0077] The adhesive layer A is obtained by curing a responsive electro-tack adhesive A.

[0078] The responsive electro-tack adhesive A includes the responsive electro-tack adhesive described in the third aspect.

[0079] Preferably, the thickness of release film layer A and release film layer B is independently 30-100μm, such as 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 100μm.

[0080] Preferably, the thickness of adhesive layer A and adhesive layer B is independently 30-50μm, such as 30μm, 32μm, 34μm, 36μm, 38μm, 40μm, 42μm, 44μm, 46μm, 48μm or 50μm.

[0081] Preferably, the thickness of the aluminum foil Mylar substrate layer is 10-60 μm, such as 10 μm, 20 μm, 30 μm, 40 μm, 50 μm or 60 μm.

[0082] Fifthly, the present invention provides a method for preparing a responsive electro-adhesive tape as described in the fourth aspect, the method comprising the following steps:

[0083] The responsive electro-tack adhesive A is coated on the aluminum foil side of the aluminum foil Mylar substrate layer, and the responsive electro-tack adhesive B is coated on the Mylar side of the aluminum foil Mylar substrate layer. Release film layer A and release film layer B are then bonded together and cured to obtain the responsive electro-tack tape.

[0084] Preferably, the bonding process includes drying adhesive layer A and adhesive layer B.

[0085] Preferably, the drying temperature is 70-150℃, such as 70℃, 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃ or 150℃.

[0086] Preferably, the drying time is 1-5 minutes, such as 1 minute, 2 minutes, 3 minutes, 4 minutes or 5 minutes.

[0087] Preferably, the curing temperature is 70-150℃, such as 70℃, 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃ or 150℃.

[0088] Preferably, the curing time is 2-24 hours, such as 2 hours, 4 hours, 6 hours, 8 hours, 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, or 24 hours.

[0089] Compared with the prior art, the present invention has the following beneficial effects:

[0090] This invention utilizes ionic liquid graft copolymerization to modify acrylate polymers, resulting in a responsive electro-tack tape with high initial adhesion, excellent high temperature and weather resistance, high pull-out force and holding force. Upon application of electrical stimulation, it exhibits a wide current signal response window, maintains high sensitivity, and demonstrates a rapid response rate, with adhesion decreasing quickly within a short time. After responsive de-tack, the interface completely separates without residue, and it exhibits low ion mobility. Specifically, the specifications are: monomer conversion rate ≥76%, pull-out force >2.1MPa, holding force >168h, 180° peel force ≥1.89kg / inch, light transmittance >98%, haze ≤0.15%, complete de-tack reduction and detachment of the tape within 45s of energization, ionic liquid mobility ≤4.5% during energization, and ionic liquid mobility ≤0.7% after aging. Attached Figure Description

[0091] Figure 1 This is a schematic diagram of the structure of the responsive electro-adhesive tape prepared in the application example of the present invention, wherein 1-release film layer A, 2-adhesive layer A, 3-aluminum foil Mylar substrate layer, 4-adhesive layer B, and 5-release film layer B. Detailed Implementation

[0092] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0093] The source information of some raw materials in this embodiment of the invention is as follows:

[0094] Polyacrylamide: Shanghai Aladdin Biochemical Technology Co., Ltd., P1103930;

[0095] N-Hydroxyethyl Acrylamide: Shanghai Maclean Biochemical Technology Co., Ltd., N918033;

[0096] Diacetone Acrylamide: Shanghai Aladdin Biochemical Technology Co., Ltd., D110099;

[0097] N-Vinylpyrrolidone: Shanghai Aladdin Biochemical Technology Co., Ltd., N159040;

[0098] Phenolic epoxy acrylate: Jiangsu Sanmu Group, 6136PB;

[0099] Polyamide 650: Shanghai Aladdin Biochemical Technology Co., Ltd., P304226;

[0100] Polyvinylpyrrolidone: Shanghai Aladdin Biochemical Technology Co., Ltd., P758744;

[0101] Benzoyl peroxide: Shanghai Aladdin Biochemical Technology Co., Ltd., B104630;

[0102] Release film: Jiangyin Huamei Optoelectronics Technology Co., Ltd., UM-0501, UM-0506;

[0103] Aluminum foil Mylar substrate: Hangzhou Hongcheng Technology Co., Ltd., 50μm aluminum foil Mylar.

[0104] Preparation Example 1

[0105] The preparation method of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt is as follows:

[0106] (1) Dissolve 3 mol of 1-(2-hydroxyethyl)-3-methylimidazolium chloride (Shanghai Aladdin Biochemical Technology Co., Ltd., H405742) in anhydrous dichloromethane, cool to 0°C in an ice bath, and slowly add a mixed solution of 3.6 mol of acryloyl chloride and 3 mol of triethylamine dropwise under vigorous stirring and nitrogen protection. After the addition is complete, raise the temperature to room temperature and continue stirring for 8 h. After the reaction is complete, filter the solution and wash the filtrate with saturated sodium bicarbonate solution and saturated saline solution in sequence.

[0107] (2) Dissolve the organic phase obtained in step (1) in acetone, add 3 mol of lithium bis(trifluoromethanesulfonyl)imide, stir vigorously at room temperature for 6 h, separate the organic layer with a separatory funnel, wash with deionized water 6 times, dry with anhydrous magnesium sulfate, filter, remove solvent by rotary evaporation, and dry under high vacuum at 55 °C for 24 h to obtain a pale yellow viscous 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt.

[0108] The substance was characterized by Fourier transform infrared spectroscopy:

[0109] At 1725cm -1 The strong absorption peak at C=O of acrylate is present.

[0110] At 1635cm -1 and 1620cm -1 The weak absorption peak of acrylate at C=C is located at the C=C region.

[0111] At 1350cm -1 and 1180cm -1 [NTf2] ⁻ The -SO2- asymmetric and symmetric stretching vibrations have strong and broad absorption bands.

[0112] In 1200-1130cm -1 Multiple absorption peaks of -CF3,

[0113] At 1570cm -1 and 1465cm -1 The absorption peak of the stretching vibration of the imidazole ring CN.

[0114] Preparation Example 2

[0115] The preparation method of 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate is as follows:

[0116] (1) Dissolve 0.1 mol of 1-methylimidazole in anhydrous acetonitrile, heat to 80 °C under nitrogen protection, and slowly add 0.1 mol of anhydrous acetonitrile solution of p-vinylbenzyl chloride while stirring. After the addition is complete, continue stirring and reflux for 24 h. After the reaction is complete, cool to room temperature and remove acetonitrile by rotary evaporation.

[0117] (2) Dissolve the solid obtained in step (1) in deionized water, add saturated aqueous solution of potassium hexafluorophosphate, stir vigorously at room temperature for 12 h, add dichloromethane, extract, and wash the organic phase repeatedly with deionized water; after drying with anhydrous magnesium sulfate, filter, remove solvent by rotary evaporation, and dry under high vacuum at 55 °C for 24 h to obtain pale yellow viscous 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate.

[0118] The substance was characterized by Fourier transform infrared spectroscopy:

[0119] At 1600, 1580, 1500 cm -1 The peak at this location corresponds to the absorption peak of the benzene ring skeleton vibration.

[0120] At 990cm -1 and 910cm -1 The two =CH2 characteristic fingerprint peaks of styrene are located at this point.

[0121] In the 3100-3000cm range -1 The region shows weak absorption peaks for the stretching vibrations of the aromatic ring and vinyl group (=CH).

[0122] At 840cm -1 and 560cm -1 The value is [PF6]. ⁻ The characteristic absorption peak,

[0123] At 1570 and 1465cm -1 The peak at this point represents the CN vibration of the imidazole ring.

[0124] Preparation Example 3

[0125] The preparation method of 1,3-bis(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide salt includes the following steps:

[0126] (1) 1,3-bis(2-hydroxyethyl)imidazolium chloride was prepared according to the method disclosed in CN101250160B.

[0127] (2) The preparation method of 1,3-bis(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide salt is the same as that in Preparation Example 1, but the amount of each substance needs to be adjusted.

[0128] Example 1

[0129] This embodiment provides an ionic liquid-modified acrylate polymer, a responsive electro-tack reducing adhesive, and a method for preparing the same. The raw materials for preparing the ionic liquid-modified acrylate polymer include the following components by weight:

[0130] Octadecyl acrylate: 32 parts;

[0131] Hydroxyethyl acrylate: 24 parts;

[0132] N-hydroxyethylamide acrylate: 12 parts;

[0133] 16 parts of methoxyethyl acrylate;

[0134] Acrylic acid: 8 parts;

[0135] Glycidyl methacrylate: 20 parts;

[0136] 1-(Acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt: 0.5 parts;

[0137] n-Dodecyl mercaptan: 0.05 parts;

[0138] Azobisisobutyronitrile: 1 part;

[0139] Ethyl acetate: 150 parts;

[0140] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0141] (1) 20 parts of octadecyl acrylate, 16 parts of hydroxyethyl acrylate, 6 parts of N-hydroxyethyl acrylamide acrylate, 8 parts of methoxyethyl acrylate, 6 parts of acrylic acid, 14 parts of glycidyl methacrylate, 90 parts of ethyl acetate, 0.05 parts of n-dodecyl mercaptan and 0.8 parts of azobisisobutyronitrile were added to a reactor, heated to 65°C, and reacted for 3 hours at a rotation speed of 100 r / min to obtain an acrylate polymer;

[0142] (2) Mix 12 parts of octadecyl acrylate, 8 parts of hydroxyethyl acrylate, 6 parts of N-hydroxyethyl acrylamide acrylate, 8 parts of methoxyethyl acrylate, 2 parts of acrylic acid, 6 parts of glycidyl methacrylate, 60 parts of ethyl acetate, 0.5 parts of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and 0.2 parts of azobisisobutyronitrile evenly and place them in a separatory funnel. Raise the reaction temperature to 78°C and add it dropwise to the acrylate polymer in step (1) within 1 hour. Keep the reaction temperature for 2 hours. After the reaction is completed, lower the temperature to room temperature and discharge the material to obtain the ionic liquid modified acrylate polymer with a weight average molecular weight of 780,000, a PDI of 9.6 and a viscosity of 6600 cp.

[0143] The preparation method of the responsive electro-tack reducing adhesive includes the following steps:

[0144] 100 parts of the above-mentioned ionic liquid modified acrylate polymer, 0.03 parts of polyacrylamide, 1 part of polyamide 650 and 1 part of methylbenzotriazole were mixed evenly at 300 r / min at room temperature, and then placed in a negative pressure degassing machine to obtain a responsive electro-tack reducing adhesive.

[0145] Example 2

[0146] This embodiment provides an ionic liquid-modified acrylate polymer, a responsive electro-tack reducing adhesive, and a method for preparing the same. The raw materials for preparing the ionic liquid-modified acrylate polymer include the following components by weight:

[0147] Dodecyl acrylate: 15 parts;

[0148] Hydroxypropyl methacrylate: 35 parts;

[0149] Diacetone acrylamide acrylate: 7 parts;

[0150] Butoxyethyl acrylate: 6 parts;

[0151] Methacrylic acid: 2 parts;

[0152] Bisphenol A diglycidyl ether diacrylate: 56 parts;

[0153] 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate: 3 parts;

[0154] n-Hexylthiol: 0.5 parts;

[0155] Dicumyl peroxide: 0.8 parts;

[0156] Toluene: 220 parts;

[0157] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0158] (1) Add 9 parts of dodecyl acrylate, 20 parts of hydroxypropyl methacrylate, 4 parts of diacetone acrylamide acrylate, 3 parts of butoxyethyl acrylate, 1 part of methacrylic acid, 20 parts of bisphenol A diglycidyl ether diacrylate, 150 parts of toluene, 0.5 parts of n-hexyl mercaptan and 0.5 parts of dicumyl peroxide to a reactor, heat to 60°C, and react for 3.5 h at a rotation speed of 120 r / min to obtain an acrylate polymer;

[0159] (2) Mix 6 parts dodecyl acrylate, 15 parts hydroxypropyl methacrylate, 3 parts diacetone acrylamide acrylate, 3 parts butoxyethyl acrylate, 1 part methacrylic acid, 36 parts bisphenol A diglycidyl ether diacrylate, 70 parts toluene, 3 parts 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate and 0.3 parts dicumyl peroxide evenly and place them in a separatory funnel. Raise the reaction temperature to 70°C and add it dropwise to the acrylate polymer in step (1) within 1 hour. Keep the reaction temperature for 3 hours. After the reaction is completed, lower the temperature to room temperature and discharge the material to obtain an ionic liquid modified acrylate polymer with a weight average molecular weight of 700,000, a PDI of 8.5 and a viscosity of 6000 cp.

[0160] The preparation method of the responsive electro-tack reducing adhesive includes the following steps:

[0161] 80 parts of the above-mentioned ionic liquid modified acrylate polymer, 1 part of polyethylene glycol dimethyl ether, 0.5 parts of methyltetrahydrophthalic anhydride and 5 parts of methylbenzotriazole were mixed evenly at room temperature at 310 r / min and then placed in a negative pressure degassing machine to obtain a responsive electro-tack reducing adhesive.

[0162] Example 3

[0163] This embodiment provides an ionic liquid-modified acrylate polymer, a responsive electro-tack reducing adhesive, and a method for preparing the same. The raw materials for preparing the ionic liquid-modified acrylate polymer include the following components by weight:

[0164] Tetradecyl acrylate: 56 parts;

[0165] Hydroxyethyl methacrylate: 10 parts;

[0166] N-vinylpyrrolidone acrylate: 18 parts;

[0167] 2-Methoxypropyl acrylate: 20 parts;

[0168] Methacrylic acid: 10 parts;

[0169] Phenolic epoxy acrylate: 12 parts;

[0170] 1,3-Di(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide salt: 5 parts;

[0171] p-Toluenethiol: 0.1 parts;

[0172] tert-butyl hydroperoxide: 2 parts;

[0173] Ethanol: 100 parts;

[0174] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0175] (1) 30 parts tetradecyl acrylate, 6 parts hydroxyethyl methacrylate, 10 parts N-vinylpyrrolidone acrylate, 9 parts 2-methoxypropyl acrylate, 5 parts methacrylic acid, 8 parts phenolic epoxy acrylate, 60 parts ethanol, 0.1 parts p-toluene mercaptan and 1.2 parts tert-butyl hydroperoxide were added to a reactor, heated to 90°C, and reacted for 2.5 h at a rotation speed of 110 r / min to obtain an acrylate polymer;

[0176] (2) Mix 26 parts tetradecyl acrylate, 4 parts hydroxyethyl methacrylate, 8 parts N-vinylpyrrolidone acrylate, 11 parts 2-methoxypropyl acrylate, 5 parts methacrylic acid, 4 parts phenolic epoxy acrylate, 40 parts ethanol, 5 parts 1,3-bis(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide salt and 0.8 parts tert-butyl hydroperoxide evenly and place them in a separatory funnel. Raise the reaction temperature to 80°C and add it dropwise to the acrylate polymer in step (1) within 1 hour. Keep the reaction temperature for 2 hours. After the reaction is completed, lower the temperature to room temperature and discharge the material to obtain the ionic liquid modified acrylate polymer with a weight average molecular weight of 860,000, a PDI of 10.0 and a viscosity of 7600 cp.

[0177] The preparation method of the responsive electro-tack reducing adhesive includes the following steps:

[0178] 120 parts of the above-mentioned ionic liquid modified acrylate polymer, 0.01 parts of polyethylene glycol dimethyl ether, 0.5 parts of m-phenylenediamine and 10 parts of methylbenzotriazole were mixed evenly at 320 r / min at room temperature, and then placed in a negative pressure degassing machine to obtain a responsive electro-tack reducing adhesive.

[0179] Example 4

[0180] The only difference from Example 1 is that: 24 parts of hydroxymethylacrylamide were used for the hydroxy acrylate, and 16 parts of trimethylolpropane triacrylate were used for the oxyalkyl acrylate. The amounts and preparation methods of the other components are the same as in Example 1.

[0181] Example 5

[0182] The only difference from Example 1 is that: 32 parts of long-chain alkyl acrylate and 12 parts of N-hydroxyethyl acrylamide acrylate are used. The amounts and preparation methods of the other components are the same as in Example 1.

[0183] Example 6

[0184] The only difference from Example 1 is that in step (2), the reaction temperature is raised to 78°C, and 12 parts of octadecyl acrylate, 8 parts of hydroxyethyl acrylate, 6 parts of N-hydroxyethyl acrylamide acrylate, 8 parts of methoxyethyl acrylate, 2 parts of acrylic acid, 6 parts of glycidyl methacrylate, 60 parts of ethyl acetate, 0.5 parts of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and 0.2 parts of azobisisobutyronitrile are added to the acrylate polymer in step (1) at once. The reaction is kept at the temperature for 2 hours. The amount of other components and the preparation method are the same as in Example 1. The weight average molecular weight of the ionic liquid modified acrylate polymer is 740,000, the PDI is 6.8, and the viscosity is 6000cp.

[0185] Example 7

[0186] The only difference from Example 1 is that in step (2), the temperature is raised to 85°C and the reaction time is 2 hours. The weight-average molecular weight of the ionic liquid modified acrylate polymer is 600,000, the PDI is 8.3, and the viscosity is 4800 cp. The amount of other components and the preparation method are the same as in Example 1.

[0187] Example 8

[0188] The only difference from Example 1 is that in step (2), the temperature is raised to 65°C and the reaction time is 12h. The weight average molecular weight of the ionic liquid modified acrylate polymer is 1.13 million, the PDI is 7.8, and the viscosity is 9800cp. The amount of other components and the preparation method are the same as in Example 1.

[0189] Example 9

[0190] The only difference from Example 1 is that octadecyl acrylate is replaced with an equal amount of isooctyl acrylate, while the amounts of other components and the preparation methods are the same as in Example 1.

[0191] Example 10

[0192] The only difference from Example 1 is that the preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0193] In step (1), octadecyl acrylate, hydroxyethyl acrylate, N-hydroxyethyl acrylamide acrylate, methoxyethyl acrylate, acrylic acid, glycidyl methacrylate, ethyl acetate, 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, and azobisisobutyronitrile were added to a reactor, heated to 60°C, and reacted for 12 hours at a rotation speed of 100 r / min. After the reaction was completed, the mixture was cooled to room temperature and discharged to obtain an ionic liquid modified acrylate polymer with a weight-average molecular weight of 900,000, a PDI of 10.5, and a viscosity of 13,000 cp.

[0194] The preparation method of the responsive electro-tack reducing adhesive includes the following steps:

[0195] 100 parts of the above-mentioned ionic liquid modified acrylate polymer, 0.03 parts of polyacrylamide and 1 part of methylbenzotriazole were mixed evenly at 300 r / min at room temperature, and then placed in a negative pressure degassing machine to obtain a responsive electro-tack reducing adhesive.

[0196] Example 11

[0197] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0198] Following the formulation and dosage of Example 1, octadecyl acrylate, hydroxyethyl acrylate, N-hydroxyethyl acrylamide acrylate, methoxyethyl acrylate, acrylic acid, glycidyl methacrylate, ethyl acetate, n-dodecyl mercaptan, and azobisisobutyronitrile were added to a reactor. The temperature was raised to 75°C, and the reaction was carried out for 6 hours at a rotation speed of 100 r / min. After the reaction was completed, the mixture was cooled to room temperature and discharged to obtain an acrylate polymer with a weight-average molecular weight of 720,000, a PDI of 8.6, and a viscosity of 6000 cp.

[0199] The preparation method of the responsive electro-tack reducing adhesive includes the following steps:

[0200] 100 parts of the above acrylate polymer, 0.5 parts of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, 0.03 parts of polyacrylamide, 1 part of polyamide 650 and 1 part of methylbenzotriazole were mixed evenly at 300 r / min at room temperature and then degassed in a negative pressure degassing machine to obtain a responsive electro-tack reducing adhesive.

[0201] Example 12

[0202] The only difference from Example 1 is that 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt is replaced with an equal amount of 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, while the amounts of other components and the preparation methods are the same as in Example 1.

[0203] Example 13

[0204] This embodiment provides an acrylate polymer, the preparation method of which includes the following steps: 32 parts of octadecyl acrylate, 24 parts of hydroxyethyl acrylate, 12 parts of N-hydroxyethylacrylamide acrylate, 16 parts of methoxyethyl acrylate, 8 parts of acrylic acid, 20 parts of glycidyl methacrylate, 150 parts of ethyl acetate, 0.05 parts of n-dodecyl mercaptan, and 1 part of azobisisobutyronitrile are added to a reactor, the temperature is raised to 75°C, and the reaction is carried out at a rotation speed of 100 r / min for 6 hours. After the reaction is completed, the mixture is cooled to room temperature and discharged to obtain the acrylate polymer with a weight-average molecular weight of 780,000, a PDI of 8.1, and a viscosity of 6500 cp.

[0205] The preparation method of the responsive electro-tack adhesive is the same as that in Example 1.

[0206] Comparative Example 1

[0207] The raw materials for preparing the ionic liquid modified acrylate polymer include the following components by weight:

[0208] Octadecyl acrylate: 42 parts;

[0209] Hydroxyethyl acrylate: 28 parts;

[0210] N-hydroxyethylamide acrylate: 15 parts;

[0211] 18 parts of methoxyethyl acrylate;

[0212] Acrylic acid: 9 parts;

[0213] 1-(Acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt: 0.5 parts;

[0214] n-Dodecyl mercaptan: 0.05 parts;

[0215] Azobisisobutyronitrile: 1 part;

[0216] Ethyl acetate: 150 parts;

[0217] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0218] (1) 20 parts of octadecyl acrylate, 16 parts of hydroxyethyl acrylate, 6 parts of N-hydroxyethyl acrylamide acrylate, 8 parts of methoxyethyl acrylate, 6 parts of acrylic acid, 90 parts of ethyl acetate, 0.05 parts of n-dodecyl mercaptan and 0.8 parts of azobisisobutyronitrile were added to a reactor, heated to 65°C, and reacted for 3 hours at a speed of 100 r / min to obtain an acrylate polymer;

[0219] (2) Mix 22 parts of octadecyl acrylate, 12 parts of hydroxyethyl acrylate, 9 parts of N-hydroxyethyl acrylamide acrylate, 10 parts of methoxyethyl acrylate, 3 parts of acrylic acid, 60 parts of ethyl acetate, 0.5 parts of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and 0.2 parts of azobisisobutyronitrile evenly and place them in a separatory funnel. Raise the reaction temperature to 78°C and add it dropwise to the acrylate polymer in step (1) within 1 hour. Keep the reaction temperature for 2 hours. After the reaction is completed, lower the temperature to room temperature and discharge the material to obtain the ionic liquid modified acrylate polymer with a weight average molecular weight of 770,000, a PDI of 9.9 and a viscosity of 6400 cp.

[0220] The preparation method of the responsive electro-tack adhesive is the same as that in Example 1.

[0221] Comparative Example 2

[0222] The raw materials for preparing the ionic liquid modified acrylate polymer include the following components by weight:

[0223] Octadecyl acrylate: 60 parts;

[0224] Hydroxyethyl acrylate: 40 parts;

[0225] Acrylic acid: 12 parts;

[0226] 1-(Acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt: 0.5 parts;

[0227] n-Dodecyl mercaptan: 0.05 parts;

[0228] Azobisisobutyronitrile: 1 part;

[0229] Ethyl acetate: 150 parts;

[0230] The preparation method of the ionic liquid modified acrylate polymer includes the following steps:

[0231] (1) 20 parts of octadecyl acrylate, 16 parts of hydroxyethyl acrylate, 6 parts of acrylic acid, 90 parts of ethyl acetate, 0.05 parts of n-dodecyl mercaptan and 0.8 parts of azobisisobutyronitrile were added to a reactor, heated to 65°C, and reacted for 3 hours at a speed of 100 r / min to obtain an acrylate polymer.

[0232] (2) Mix 40 parts of octadecyl acrylate, 24 parts of hydroxyethyl acrylate, 6 parts of acrylic acid, 60 parts of ethyl acetate, 0.5 parts of 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and 0.2 parts of azobisisobutyronitrile evenly and place them in a separatory funnel. Raise the reaction temperature to 78°C and add it dropwise to the acrylate polymer in step (1) within 1 hour. Keep the reaction temperature for 2 hours. After the reaction is completed, lower the temperature to room temperature and discharge the material to obtain the ionic liquid modified acrylate polymer with a weight average molecular weight of 790,000, a PDI of 10.0 and a viscosity of 6800 cp.

[0233] The preparation method of the adhesive is the same as in Example 1.

[0234] Application Example 1-12 and Comparative Application Example 1-2

[0235] Application Examples 1-12 and Comparative Application Examples 1-2 each provide a responsive electro-adhesive tape, the structural schematic diagram of which is shown below. Figure 1 As shown, it includes, in sequence: 1-release film layer A (UM-0501) with a thickness of 50μm, 2-adhesive layer A with a thickness of 40μm, 3-aluminum foil Mylar substrate layer with a thickness of 40μm, 4-adhesive layer B with a thickness of 40μm, and 5-release film layer B (UM-0506) with a thickness of 70μm.

[0236] The responsive electro-tack adhesives prepared in Examples 1-12 and Comparative Examples 1-2 were coated on the aluminum foil side of the aluminum foil Mylar substrate, and the adhesive prepared in Example 13 was coated on the Mylar side of the aluminum foil Mylar substrate. The substrates were baked in an oven at 100°C for 5 minutes, and then a release film layer was laminated and cured in an oven at 70°C for 24 hours to obtain the responsive electro-tack tape.

[0237] Performance testing

[0238] (1) Holding power: Tested in accordance with GB / T 4851-2014 "Test method for holding power of adhesive tape".

[0239] (2) Pull-out force: Tested in accordance with GB / T 30776-2014 "Test method for tensile strength and elongation at break of adhesive tape".

[0240] (3) 180° peel strength: Tested according to GB / T 2792-2014 "Test method for peel strength of adhesive tape".

[0241] (4) Light transmittance and haze: The pure film was tested according to ASTM D1003.

[0242] (5) Electro-tack reduction time: Cut the sample into strips of 10cm×2.5cm. According to the sample preparation method for peel force test, attach the electro-tack reduction surface to the surface of a clean 5-series (5052) aluminum alloy plate or stainless steel plate. Use a 1kg pressure roller to roll it repeatedly 3 times to ensure that the sample and the plate are tightly bonded without bubbles, wrinkles or other abnormalities. Place it in an environment with a temperature of 25±5℃ and a relative humidity of 65%±10% for 30 minutes.

[0243] During the peel force test, the test plate and aluminum foil (double-sided adhesive support substrate) are clamped onto the peel force test fixture according to the peel force test sample test method. The sample and the fixture are kept on the same axis. The power supply is adjusted to 13V, with the negative terminal clamped to the test plate and the positive terminal clamped to the aluminum foil. After energizing for 120s, the peel force data is tested. If the tape is completely de-adhesive and falls off within the energizing time, the energizing time at the time of falling off is recorded.

[0244] (6) Monomer conversion rate: At the end of the experiment, samples were taken and the monomer conversion rate was calculated using a gas chromatograph.

[0245] (7) Ionic liquid mobility after energization and ionic liquid mobility after aging: The sheet resistance R of the electro-tack reducing film before and after migration was measured using a conductivity meter or electrochemical impedance spectroscopy (EIS). s and R s ', the mobility is expressed as (R s -R s ') / R s .

[0246] Following the above testing method, performance tests were conducted on the responsive electro-adhesive tapes provided in the corresponding use cases and comparative application examples. The results are shown in Table 1-2.

[0247] Table 1

[0248]

[0249] Table 2

[0250]

[0251] As shown in Table 1, the responsive electro-tack tapes prepared in Examples 1-5 of this invention exhibit high initial adhesion, excellent high temperature and weather resistance, high pull-out force and holding force, a wide current signal response window when stimulated by current, high sensitivity, and a fast response rate. The adhesiveness decreases rapidly in a short time, and after responsive tack reduction, the interface completely separates without residue. Specifically, the following parameters are observed: monomer conversion rate ≥76%, pull-out force >2.1MPa, holding force >168h, 180° peel force ≥1.89kg / inch, light transmittance >98%, haze ≤0.15%, complete tack reduction and detachment within 45s of energization, ionic liquid migration rate ≤4.5% after energization, and ionic liquid migration rate ≤0.7% after aging.

[0252] As can be seen from the comparison between Application Example 1 and Application Example 6, if the PDI of the ionic liquid modified acrylate polymer is low, the tack window of the responsive electro-tack tape will be narrowed, the holding force, pull force and peel force will decrease, and the ionic liquid migration rate will increase.

[0253] As can be seen from the comparison between Application Example 1 and Application Examples 7-8, if the molecular weight of the acrylate polymer is not between 700,000 and 900,000, the molecular weight being too large or too small will affect the cohesion and wettability, resulting in a decrease in the adhesive performance of the responsive electro-tack tape. At the same time, an excessively small molecular weight makes it difficult to maintain the stability of the ionic liquid system, resulting in an increase in the ionic liquid migration rate after high-temperature aging test.

[0254] As can be seen from the comparison between Application Example 1 and Application Example 9, if octadecyl acrylate is replaced with isooctyl acrylate, although the optical properties of the responsive electro-tack tape are improved, the tg of the responsive electro-tack tape increases, the flexibility decreases, and thus the peel strength decreases.

[0255] As can be seen from the comparison between Application Example 1 and Application Example 10, without the introduction of a curing agent, physical cross-linking (polymer entanglement and hydrogen bonding) is used. Although the peel force is relatively large, the holding force and pull-out force are extremely poor and cohesive failure occurs. This leads to a surge in the electro-tack reduction time of the responsive electro-tack tape, while the tack reduction is incomplete and the ionic liquid migration rate is high.

[0256] As can be seen from the comparison between Application Example 1 and Application Example 11, the added ionic liquid is free in the adhesive film and does not crosslink with the polymer backbone, resulting in a higher ionic liquid migration rate in the responsive electro-tack tape.

[0257] As can be seen from the comparison between Application Example 1 and Application Example 12, the ionic liquid 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide has a strong self-inhibiting effect due to the allyl group being a low-reactivity monomer, which leads to a sharp decrease in monomer conversion rate and a change from a robust network to a loose oligomer, resulting in an increase in the ionic liquid migration rate of the responsive electro-tack tape.

[0258] As can be seen from the comparison between Application Example 1 and Comparative Application Example 1-2, if one or more monomers of the acrylate polymer are missing, the degree of crosslinking, molecular weight or hydrophilicity will change due to the different functional properties of different monomers, which will lead to a decrease in the adhesion, durability and tack reduction effect of the responsive electro-tack tape.

[0259] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An ionic liquid-modified acrylate polymer, characterized in that, The raw materials for preparing the ionic liquid modified acrylate polymer include the following components by weight: 10-60 parts of long-chain alkyl acrylates; 10-40 parts of hydroxy acrylate; 5-20 parts of amide acrylate; 5-20 parts of oxyalkyl acrylate; 1-10 parts of (meth)acrylic acid / acryloyloxycarboxylic acid; 10-60 parts of epoxy acrylate; 0.5-5 parts of ionic liquid; 0.01-0.1 parts of relative molecular mass regulator; 0.1-2 parts of thermal initiator; Solvent 90-240 parts.

2. The ionic liquid-modified acrylate polymer according to claim 1, characterized in that, The weight-average molecular weight of the ionic liquid-modified acrylate polymer is 700,000 to 900,000. Preferably, the molecular weight distribution of the ionic liquid-modified acrylate polymer is 8.5-10.5; Preferably, the ionic liquid has the structure shown in Formula I, Formula II, or Formula III: ； Among them, R1, R2, R3, R5, R6, R7, R9, R 10 Each of the following is independently selected from hydrogen, C2-C10 alkyl groups, C2-C10 alkyl groups in which one or at least two non-adjacent methylene groups are independently substituted with heteroatoms, and olefinically unsaturated polymerizable groups; the heteroatoms include at least one of oxygen or sulfur; The olefin-containing unsaturated polymerizable group includes at least one of (meth)acryloyl, vinylbenzyl, or (meth)acrylamido. At least one substituent in Formula I, Formula II and Formula III is selected from an olefinically unsaturated polymerizable group; R4 and R8 are selected from carbon, and m and n are each an independent integer from 1 to 3; The X m- Selected from Cl - ,Br - I - BF4 - PF6 - (CF3SO2)2N - CO3 2- CH3COO - SO4 2- CF3COO - CF3SO3 - SbF6 - FSO3 - CN - SCN - NO3 - NO2 - H2PO4 - PO4 3- HCO3 - HSO4 - SO3 2- AlCl4 - CH3CHOHCOO - NH2CH2COO - NCN2 - (C8F) 17 SO2)2N - (SO2F)2N - (C2F5SO2)2N - Or (C4F9SO2)(CF3SO2)N - Any one of them; Preferably, the ionic liquid comprises any one or a combination of at least two of the following: 1-(acryloyloxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (methacryloyloxyethyl)trimethylammonium bis(trifluoromethanesulfonyl)imide, 1-(p-vinylbenzyl)-3-methylimidazolium hexafluorophosphate, 1-(acrylamidopropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (methacryloyloxyethyl)dimethyldodecylammonium bis(trifluoromethanesulfonyl)imide, or 1,3-bis(acryloyloxyethyl)imidazolium bis(trifluoromethanesulfonyl)imide.

3. The ionic liquid-modified acrylate polymer according to claim 1 or 2, characterized in that, The long-chain alkyl acrylate has a carbon number of C12-C30; Preferably, the long-chain alkyl acrylate includes any one or a combination of at least two of dodecyl acrylate, tridecyl acrylate, tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, isooctadecyl acrylate, or oleyl acrylate. Preferably, the hydroxy acrylate comprises any one or a combination of at least two of hydroxyethyl acrylate, β-hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, or hydroxymethylacrylamide; Preferably, the amide acrylate comprises any one or a combination of at least two of N-acryloyloxyethylacrylamide, N-hydroxyethylacrylamide acrylate, N-isopropylacrylamide acrylate, diacetone acrylamide acrylate, N-vinylpyrrolidone acrylate, N-acryloylmorpholine acrylate, or N-acryloylcaprolactam acrylate. Preferably, the alkyl acrylate comprises any one or a combination of at least two of the following: methoxyethyl acrylate, ethoxyethyl acrylate, propoxyethyl acrylate, butoxyethyl acrylate, 2-methoxypropyl acrylate, 2-ethoxypropyl acrylate, or trimethylolpropane triacrylate. Preferably, the (meth)acrylic acid comprises acrylic acid and / or methacrylic acid; Preferably, the acryloyloxycarboxylic acid includes β-(acryloyloxy)propionic acid; Preferably, the epoxy acrylate includes any one or a combination of at least two of glycidyl methacrylate, bisphenol A diglycidyl ether diacrylate, phenolic epoxy acrylate, or epoxy polyethylene glycol acrylate. Preferably, the relative molecular mass regulator includes any one or a combination of at least two of the following: n-butanethiol, n-hexanethiol, n-dodecylthiol, tert-dodecylthiol, n-tetradecylthiol, benzenethiol, p-toluenethiol, 2,4-di-p-toluenethiol, 2-mercaptoethanol, or 3-mercaptopropionic acid. Preferably, the thermal initiator comprises any one or a combination of at least two of the following: benzoyl peroxide, dicumyl peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, tert-butyl peroxide, tert-butyl hydroperoxide, azobisisobutyronitrile, azobisisoheptanenitrile, dimethyl azobisisobutyrate, azobiscyanopentanoic acid, potassium persulfate, or ammonium persulfate. Preferably, the solvent includes any one or a combination of at least two of the following: methanol, ethanol, isopropanol, benzene, toluene, xylene, ethyl acetate, butyl acetate, acetone, butanone, cyclohexanone, diethyl ether, tetrahydrofuran, N,N-dimethylformamide, N,N-dimethylacetamide, dichloromethane, chloroform, carbon tetrachloride, or acetonitrile.

4. A method for preparing an ionic liquid-modified acrylate polymer as described in any one of claims 1-3, characterized in that, The preparation method includes the following steps: (1) Dissolve a portion of long-chain alkyl acrylate, a portion of hydroxy acrylate, a portion of amide acrylate, a portion of oxyalkyl acrylate, a portion of (meth)acrylic acid / acryloyloxycarboxylic acid and a portion of epoxy acrylate in a solvent, add a relative molecular mass regulator and a portion of thermal initiator, and react to obtain the acrylate polymer. (2) Add the remaining long-chain alkyl acrylate, the remaining hydroxy acrylate, the remaining amide acrylate, the remaining alkyl acrylate, the remaining (meth)acrylic acid / acryloyloxycarboxylic acid, the remaining epoxy acrylate, the remaining solvent, the ionic liquid and the remaining thermal initiator to the acrylate polymer, and react to obtain the ionic liquid modified acrylate polymer.

5. The preparation method according to claim 4, characterized in that, In step (1), the reaction temperature is 60-90℃; Preferably, in step (1), the reaction time is 2.5-3.5 h; Preferably, in step (2), the reaction temperature is 70-80℃; Preferably, in step (2), the reaction time is 3-4 hours.

6. A responsive electro-tack adhesive, characterized in that, The responsive electro-tack adhesive comprises the ionic liquid modified acrylate polymer according to any one of claims 1-3.

7. The responsive electro-tack adhesive according to claim 6, characterized in that, The responsive electro-tack adhesive comprises the following components by weight: 80-120 parts of ionic liquid modified acrylate polymer; 0.01-1 part of water-soluble polymer; Hardener 0.5-1.2 parts; Corrosion inhibitor 1-10 parts.

8. The responsive electro-tack adhesive according to claim 6 or 7, characterized in that, The polymer monomers of the water-soluble polymer include any one or a combination of at least two of carboxyl-containing monomers, hydroxyl-containing monomers, ether-containing monomers, vinylpyrrolidone, or acrylamide. Preferably, the curing agent comprises any one or a combination of at least two of the following: ethylenediamine, diethylenetriamine, m-phenylenediamine, phthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, polyamide, dicyandiamide, 2-methylimidazole, 2-ethyl-4-methylimidazole, hexamethylenetetramine, p-toluenesulfonic acid, phenolsulfonic acid, toluene diisocyanate, hexamethylene diisocyanate, or isophorone diisocyanate.

9. A responsive electro-adhesive tape, characterized in that, The responsive electro-adhesive tape includes a release film layer A, an adhesive layer A, an aluminum foil Mylar substrate layer, an adhesive layer B, and a release film layer B arranged sequentially. The adhesive layer A is obtained by curing a responsive electro-tack reducing adhesive A; The responsive electro-tack adhesive A comprises the responsive electro-tack adhesive according to any one of claims 6-8.

10. A method for preparing a responsive electro-adhesive tape as described in claim 9, characterized in that, The preparation method includes the following steps: The responsive electro-tack adhesive A is coated on the aluminum foil side of the aluminum foil Mylar substrate layer, and the responsive electro-tack adhesive B is coated on the Mylar side of the aluminum foil Mylar substrate layer. Release film layer A and release film layer B are then bonded together and cured to obtain the responsive electro-tack tape.

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