An electro-strippable composition, a preparation method thereof, and an adhesive article

Abstract

The present application provides an electrically peelable composition, a preparation method and an adhesive article, belonging to the field of chemical materials. The electrically peelable composition provided by the present application comprises the following components: an acrylate polymer, an ionic liquid, an auxiliary agent A and an auxiliary agent B; the auxiliary agent A accounts for 10% to 30% of the total weight of the acrylate polymer; the mass ratio of the auxiliary agent A to the auxiliary agent B is (10 to 30):(1 to 10); wherein, the auxiliary agent A and the auxiliary agent B are used for co-crosslinking reaction with the acrylate polymer. Through the optimized design of the components of the electrically peelable composition, the present application significantly improves the adhesive holding force of the adhesive article made of the electrically peelable composition, and at the same time can effectively balance the easy peelability and adhesive performance of the adhesive article when electrified.

Description

Technical Field

[0001] The present invention belongs to the field of chemical materials, and particularly relates to an electro-strippable composition, a preparation method and an adhesive article. Background Art

[0002] During the manufacturing process of electronic components, in order to improve the reprocessability of the finished product rate and meet the requirements for recycling after recovery, it is necessary to provide an adhesive article with high adhesive performance and easy peelability; after the adhesive article is pasted on the adherend, it should have strong adhesive force and be easily removed from the adherend during peeling to ensure the recyclability of the adherend.

[0003] The adhesive articles in the prior art are often made of electro-strippable compositions. When a voltage is applied during peeling, the adhesive force of the adhesive article is reduced, so that it can be peeled off from the adherend; however, the adhesive articles made of electro-strippable compositions are restricted by the raw material components and have the defect of poor cohesive force, resulting in poor adhesive retention of the adhesive articles and being unable to effectively balance the easy electro-strippability and adhesive performance.

[0004] In view of this, the present application is specifically proposed. Summary of the Invention

[0005] The present application provides an electro-strippable composition, a preparation method and an adhesive article, aiming to solve the problem that the adhesive retention of the adhesive article in the prior art is poor and it is unable to effectively balance the easy electro-strippability and adhesive performance.

[0006] The first aspect of the present application provides an electro-strippable composition, comprising the following components: acrylate polymer, ionic liquid, additive A and additive B; additive A accounts for 10% - 30% of the total weight of the acrylate polymer; the mass ratio of additive A to additive B is (10 - 30):(1 - 10); wherein, additive A and additive B are used for co-crosslinking reaction with the acrylate polymer.

[0007] The present application optimizes the raw material components of the electro-strippable composition, and uses acrylate polymer, ionic liquid, additive A and additive B as the main raw materials; wherein, the acrylate polymer can endow the electro-strippable composition with adhesiveness, and the ionic liquid can enable the adhesive layer formed by the electro-strippable composition to have the characteristic of easy electro-strippability; additive A can crosslink with the acrylate polymer to facilitate the electro-strippable composition to form an adhesive layer with a high peel strength before electrification, so that it is not easily peeled off from the adherend; additive B can crosslink with the acrylate polymer to cure it into a film to facilitate the electro-strippable composition to form an adhesive layer.

[0008] Particularly critically, the auxiliary agent A accounts for 10% to 30% of the total weight of the acrylate polymer, and the mass ratio of the auxiliary agent A to the auxiliary agent B is (10 to 30):(1 to 10). Within this weight range, the auxiliary agent A, the auxiliary agent B, and the acrylate polymer can undergo a synergistic cross-linking reaction, enabling the electro-strippable composition to have an appropriate cross-linking density, significantly improving the cohesion of the electro-strippable composition, and thus greatly enhancing the adhesion retention of the adhesive layer formed by the electro-strippable composition, so that its easy electro-strippability and adhesion performance can be effectively balanced.

[0009] Therefore, through the synergistic compatibility of raw material components such as acrylate polymer, ionic liquid, auxiliary agent A, and auxiliary agent B in the electro-strippable composition provided by this application, the cohesive strength of the electro-strippable composition has been significantly improved. Before electrification, the adhesive layer formed by the electro-strippable composition has a high peel strength and adhesion retention, and is easily peeled off from the adherend after electrification, so that the adhesive product made of the electro-strippable composition can have both easy electro-strippability and excellent adhesion performance.

[0010] In some embodiments, the electro-strippable composition satisfies at least one of the following conditions A to H:

[0011] A. By weight, relative to 100 parts of the acrylate polymer, in the components of the electro-strippable composition, the ionic liquid is 2 to 30 parts, the auxiliary agent A is 10 to 30 parts, and the auxiliary agent B is 1 to 10 parts;

[0012] B. The auxiliary agent A includes a linear resin with active functional groups and has a molecular weight of 200 to 1000.

[0013] C. The auxiliary agent B includes a UV-curable resin and / or a non-UV-curable resin;

[0014] D. The anion of the ionic liquid is a bis(fluorosulfonyl)imide anion;

[0015] E. The cation of the ionic liquid includes at least one of a nitrogen-containing onium cation, a sulfur-containing onium cation, a phosphorus-containing onium cation, an imidazolium-based cation, an ammonium-based cation, or a pyridinium-based cation;

[0016] F. The solid content of the acrylate polymer is 10% to 50%;

[0017] G. The weight-average molecular weight of the acrylate polymer is above 100,000 and below 5,000,000, preferably above 200,000 and below 4,000,000, more preferably above 300,000 and below 3,000,000;

[0018] H. The glass transition temperature of the acrylate polymer is below 0 °C, preferably below -20 °C, more preferably below -40 °C.

[0019] In some embodiments, the additive A includes at least one of a rosin carboxyl-containing tackifying resin, an epoxy epoxy-containing tackifying resin, a phenolic hydroxyl-containing tackifying resin, an acrylate tackifying resin, and the resins represented by Formula I, Formula II, and Formula III below.

[0020]

[0021] Wherein, R1 represents a phenyl group, a cyclohexyl group or a methylene group, R2 represents a methyl group, a hydroxyl group, a vinyl group, a carboxyl group, an epoxy group, a mercapto group or an acryloyloxy group, and R represents a methyl group, a hydroxyl group, a vinyl group, a carboxyl group, an epoxy group, a mercapto group or an acryloyloxy group. In some embodiments, when the additive B is a non-UV curable resin, it includes at least one of an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent or a metal chelate crosslinking agent; or when the additive B is a UV curable resin, it includes at least one of epoxy acrylate, polyurethane acrylate or polyester acrylate.

[0022] In some embodiments, the acrylate polymer is made from a main unit, a functional unit and an initiator as main raw materials; wherein, the main unit is an alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms; the functional unit includes an acrylate monomer containing a carboxyl group and / or an acrylate monomer containing a hydroxyl group; the initiator includes any one of a polymerization thermal initiator and a polymerization photoinitiator.

[0023] In some embodiments, the acrylate polymer satisfies one or more of the following conditions I to M:

[0024] I. When the initiator is a polymerization thermal initiator, the mass ratio of the main unit to the functional unit is (70 to 95):(5 to 30);

[0025] J. When the initiator is a polymerization photoinitiator, the raw materials of the acrylate polymer further include a polyfunctional UV monomer; the mass ratio of the main unit, the functional unit and the polyfunctional UV monomer is (60 to 95):(3 to 30):(2 to 10), preferably (60 to 85):(10 to 30):(5 to 10);

[0026] K. The raw materials of the acrylate polymer further include a polymerization solvent, and the polymerization solvent includes at least one of an aliphatic hydrocarbon, an ester compound and an aromatic hydrocarbon;

[0027] L. The polymerization thermal initiator includes any one of azo polymerization initiators such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylpropionamidine) disulfide, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4,4-trimethylpentane), dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis[2-methyl-N-(phenylmethyl)-propionamidine] dihydrochloride, 2,2'-azobis[2-(3,4,5,6-tetrahydropyrimidin-2-yl)propane] dihydrochloride or 2,2'-azobis[2-(2-imidazolin-2-yl)propane]; or any one of persulfate compounds such as potassium persulfate or ammonium persulfate.

[0028] M. The polymerization photoinitiator includes any one of type I photoinitiators such as hydroxybenzophenone, alkylaminobenzophenone, benzoin ether or phosphine oxide; or any one of type II initiators such as benzophenone, substituted benzophenone, anthraquinone, benzoylformate, camphorquinone or thioxanthone.

[0029] The second aspect of the present application provides a preparation method of an electrostrippable composition, including:

[0030] Step for preparing acrylate polymer: Reacting the main unit, functional unit and polymerization solvent with a polymerization thermal initiator in a predetermined ratio to obtain acrylate polymer A; or reacting the main unit, functional unit, polyfunctional UV monomer and polymerization solvent with a polymerization photoinitiator in a predetermined ratio to obtain acrylate polymer B.

[0031] Step for preparing electrostrippable composition: Mixing and reacting acrylate polymer A or acrylate polymer B with the remaining components in a predetermined ratio to obtain an electrostrippable composition.

[0032] In some embodiments, the step for preparing acrylate polymer specifically includes:

[0033] Mixing the monomer mixture A composed of the main unit and functional unit with the polymerization solvent in a mass ratio of 1:(1-9), adding a polymerization thermal initiator accounting for 0.2-1% of the mass of monomer mixture A, and heating the reaction to obtain acrylate polymer A; or

[0034] Mixing the monomer mixture B composed of the main unit, functional unit and polyfunctional UV monomer with the polymerization solvent in a mass ratio of 1:(1-9), adding a polymerization photoinitiator accounting for 1-5% of the mass of monomer mixture B, and reacting under a UV light environment to obtain acrylate polymer B.

[0035] In some embodiments, in the preparation step of the electrically peelable composition, when the acrylate polymer B is mixed and reacted with the remaining components in a predetermined ratio, the remaining components further include a polymerization photoinitiator accounting for 1 to 5% of the total mass of the acrylate polymer B.

[0036] The third aspect of the present application provides an adhesive article, including an adhesive layer formed by the electrically peelable composition prepared by the above-mentioned electrically peelable composition or the above-mentioned preparation method. Detailed embodiments

[0037] The "ranges" disclosed in the present application are defined in the form of lower and upper limits. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a particular range. The ranges defined in this way can include or exclude the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present application, unless otherwise specified, the numerical range "a-b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been fully listed herein, and "0-5" is only an abbreviated representation of these numerical combinations. Additionally, when it is stated that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0038] If there is no special instruction, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0039] If there is no special instruction, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0040] If there is no special instruction, all steps of the present application can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b), and (c), or can also include steps (a), (c), and (b), or can also include steps (c), (a), and (b), etc.

[0041] Unless otherwise specified, the terms "comprising" and "including" mentioned in this application are open-ended and can also be closed-ended. For example, the said "comprising" and "including" can also include or contain other components not listed, or can only include or contain the listed components.

[0042] Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) while B is true (or exists); or both A and B are true (or exist).

[0043] As described above, the general inventive concept of the embodiments of this application is to provide an electrically peelable composition. By designing raw material components such as acrylate polymers, ionic liquids, additive A, and additive B, the additive A, additive B, and acrylate polymer used can undergo a synergistic cross-linking reaction under specific ratios, so as to greatly improve the cohesive force of the electrically peelable composition, and further promote the adhesive layer formed by the electrically peelable composition to have a high peel strength and strong adhesion retention before electrification, so that the adhesive product made of the electrically peelable composition can have both easy peelability upon electrification and adhesive properties.

[0044] Based on the above inventive concept, an electrically peelable composition provided by the embodiments of this application includes the following components: acrylate polymer, ionic liquid, additive A, and additive B; additive A accounts for 10% - 30% of the total weight of the acrylate polymer; the mass ratio of additive A to additive B is (10 - 30):(1 - 10); wherein, additive A and additive B are used for a synergistic cross-linking reaction with the acrylate polymer.

[0045] It should be noted that the ionic liquid in the embodiments of this application refers to a salt that is liquid at room temperature, also known as a room-temperature molten salt. The ionic liquid is mainly composed of cations and anions and has characteristics such as heat resistance, non-flammability, non-volatility, and chemical stability; under the application of voltage, the ionic liquid undergoes electrolysis, and the adhesive force of the adhesive layer formed by the electrically peelable composition is reduced, so that the adhesive product made of the electrically peelable composition has the characteristic of easy peelability upon electrification.

[0046] It should be understood that generally the introduction of ionic liquids will inhibit the crosslinking density of the electro-strippable composition, resulting in a decrease in cohesive force. However, in the component design of this application, Auxiliary A and Auxiliary B are used. By synergistically crosslinking with acrylate polymers, the loss of crosslinking density caused by the introduction of ionic liquids can be effectively overcome, enabling the electro-strippable composition to have an appropriate crosslinking density, thereby significantly improving the cohesive force of the electro-strippable composition, making the adhesive layer formed by the electro-strippable composition have excellent adhesion retention, and at the same time having easy strippability upon electrification.

[0047] Meanwhile, Auxiliary A accounts for 10% - 30% of the total weight of the acrylate polymer. Within this weight range, Auxiliary A and Auxiliary B can crosslink with the acrylate polymer, thereby effectively increasing the crosslinking density and promoting the effective increase in the cohesive force of the electro-strippable composition; when the proportion of Auxiliary A is less than 10% of the total weight of the acrylate polymer, the synergistic effect of Auxiliary A and Auxiliary B on the acrylate polymer is relatively poor, and the pre-electrification peel strength of the adhesive layer formed by the electro-strippable composition is relatively low and it is easy to peel off from the adherend. When the proportion of Auxiliary A is higher than 30% of the total weight of the acrylate polymer, the cohesive strength of the electro-strippable composition will decay severely, and the adhesion retention of the adhesive layer formed by the electro-strippable composition is relatively poor.

[0048] Moreover, the mass ratio of Auxiliary A to Auxiliary B is (10 - 30):(1 - 10). At this mass ratio, Auxiliary B and Auxiliary A can jointly crosslink with the acrylate polymer to significantly improve the cohesive force of the electro-strippable composition, and the adhesion retention and easy strippability upon electrification of the adhesive layer formed by the electro-strippable composition can be taken into account; when the mass proportion of Auxiliary B in the mass ratio of Auxiliary A to Auxiliary B is too low, it will lead to a relatively low crosslinking density of the electro-strippable composition, a relatively low cohesive force of the electro-strippable composition, and a relatively poor adhesion retention of the adhesive layer formed by the electro-strippable composition. When the mass proportion of Auxiliary B is too high, it will lead to an excessively high crosslinking density of the electro-strippable composition, resulting in a sharp decrease in the peel strength of the adhesive layer formed by the electro-strippable composition and being unable to stably adhere to the adherend without applying voltage.

[0049] Therefore, through the synergistic compatibility of raw material components such as acrylate polymers, ionic liquids, Auxiliary A, and Auxiliary B in the electro-strippable composition provided in this application, the cohesive force of the electro-strippable composition has been significantly improved. The adhesive layer formed by the electro-strippable composition has a relatively high peel strength and adhesion retention before electrification, and can have both easy strippability upon electrification and excellent adhesion performance.

[0050] It should be clear that the auxiliary agent A accounts for 10% to 30% of the total weight of the acrylate polymer. For example, the auxiliary agent A can specifically account for 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or any weight percentage within the range of 10% to 30% of the total weight of the acrylate polymer; the mass ratio of the auxiliary agent A to the auxiliary agent B is (10 to 30):(1 to 10). For example, the mass ratio of the auxiliary agent A to the auxiliary agent B can be 10:1, 10:2, 10:3, 10:4, 10:5, 10:6, 10:7, 10:8, 10:9, 10:10, 15:1, 15:2, 15:3, 15:4, 15:5, 15:6, 15:7, 15:8, 15:9, 15:10, 20:1, 20:2, 20:3, 20:4, 20:5, 20:6, 20:7, 20:8, 20:9, 20:10, 25:1, 25:2, 25:3, 25:4, 25:5, 25:6, 25:7, 25:8, 25:9, 25:10, 30:1, 30:2, 30:3, 30:4, 30:5, 30:6, 30:7, 30:8, 30:9, 30:10 or any mass ratio within the range of (10 to 30):(1 to 10).

[0051] In some embodiments, the mass ratio of the auxiliary agent A to the auxiliary agent B is preferably (10 to 30):(1 to 5), more preferably (15 to 25):(1 to 5). The preferred design of the mass ratio of the auxiliary agent A to the auxiliary agent B helps the auxiliary agent B and the auxiliary agent A to crosslink more fully with the acrylate polymer together, so as to further improve the cohesion of the electro-stripping composition and balance the adhesion retention force and the easy electro-stripping property of the adhesive layer formed by the electro-stripping composition.

[0052] In some embodiments, based on parts by weight, relative to 100 parts of the acrylate polymer, in the components of the electro-strippable composition, the ionic liquid is 2 to 30 parts, the auxiliary agent A is 10 to 30 parts, and the auxiliary agent B is 1 to 10 parts. By designing the ionic liquid to be 2 to 30 parts, the auxiliary agent A to be 10 to 30 parts, and the auxiliary agent B to be 1 to 10 parts relative to 100 parts of the acrylate polymer, the cohesive strength of the electro-strippable composition can be effectively improved, so that the adhesive layer formed by the electro-strippable composition has a high peel strength and adhesion retention before energization, and is easy to be peeled off from the adherend after energization, having both easy electro-strippability and excellent adhesion performance. For example, relative to 100 parts of the acrylate polymer, the ionic liquid can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, any weight part within the range of 2 to 30 parts, the auxiliary agent A can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, any weight part within the range of 10 to 30 parts, and the auxiliary agent B can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, or any weight part within the range of 1 to 10 parts.

[0053] In some embodiments, based on parts by weight, relative to 100 parts of the acrylate polymer, the auxiliary agent B is preferably 1 to 5 parts, which is beneficial to further promoting the crosslinking of the acrylate polymer, so that the cohesive force of the electro-strippable composition is further improved, and the adhesion retention and easy electro-strippability of the adhesive layer formed by the electro-strippable composition can be balanced.

[0054] In some embodiments, based on parts by weight, relative to 100 parts of the acrylate polymer, the ionic liquid is preferably 2 to 15 parts, more preferably 2 to 9 parts. The design of the preferred weight parts of the ionic liquid is more beneficial to reducing the influence on the crosslinking density of the electro-strippable composition, while further improving the cohesive force of the electro-strippable composition, so that the adhesion retention and easy electro-strippability of the adhesive layer formed by the electro-strippable composition can be balanced. When the ionic liquid is less than 2 parts, the easy electro-strippability of the adhesive layer formed by the electro-strippable composition will decay rapidly after energization, and it is impossible to balance the adhesion retention and easy electro-strippability.

[0055] In some embodiments, the additive A includes a linear resin containing active functional groups and has a molecular weight of 200 to 1000. The resin containing active functional groups can undergo a crosslinking reaction with the acrylate polymer. Moreover, due to the low molecular weight of the resin containing active functional groups, the additive A can have a high reaction activity, promoting its synergistic crosslinking effect with the acrylate polymer, so as to increase the crosslinking density of the electrostripping composition, thereby increasing the cohesive force of the electrostripping composition, so that the adhesive layer formed by the electrostripping composition has a high adhesion retention force.

[0056] In some embodiments, the additive B includes a UV-curable resin and / or a non-UV-curable resin. Whether the UV-curable resin or the non-UV-curable resin is used as the additive B, it can undergo a crosslinking reaction with the acrylate polymer to cure into a film, making up for the loss of crosslinking density caused by the introduction of the ionic liquid, increasing the cohesive force of the electrostripping composition, and enabling the adhesive layer formed by the electrostripping composition to have a high adhesion retention force. When the additive B uses a UV-curable resin, it can participate in a free radical polymerization reaction with the acrylate polymer, further increasing the crosslinking density, so as to greatly increase the cohesive strength of the electrostripping composition, and enabling the adhesive layer formed by the electrostripping composition to have a higher adhesion retention force.

[0057] In some embodiments, the additive A may specifically be a reactive tackifying resin. The additive A includes at least one of a rosin carboxyl-containing tackifying resin, an epoxy-containing epoxy tackifying resin, a phenolic hydroxyl-containing tackifying resin, an acrylate tackifying resin, and the resins represented by the following formulas I, II, and III.

[0058]

[0059] Among them, R1 represents a phenyl group, a cyclohexyl group or a methylene group, R2 represents a methyl group, a hydroxyl group, a vinyl group, a carboxyl group, an epoxy group, a mercapto group or an acryloyloxy group, and R represents a methyl group, a hydroxyl group, a vinyl group, a carboxyl group, an epoxy group, a mercapto group or an acryloyloxy group.

[0060] The above substances are all reactive tackifying resins. As the additive A, it can ensure that the electrostripping composition has a high peel strength before power-on, and can synergistically crosslink with the acrylate polymer, increasing the crosslinking density of the electrostripping composition, and thus effectively increasing the adhesion retention force of the adhesive layer formed by the electrostripping composition.

[0061] It should be noted that Auxiliary A can be obtained through commercial purchase. For example, rosin carboxyl-containing tackifying resin can be purchased from ARDYME R-9520 of Arakawa Chemical, and for another example, the resin of Formula I can be purchased from TSR-6000 of Yiqing Chemical, but it is not limited thereto. In addition, when the target structure of any one of the resins of Formula I, Formula II, and Formula III is known, resins having any one of the structures of Formula I, Formula II, and Formula III can also be prepared based on existing raw materials such as resins and organic monomers through conventional synthesis or modification means. For example, the resin of Formula II can be prepared by modifying disproportionated rosin, and for another example, the resin of Formula III can be prepared by modifying p-tert-octylphenol formaldehyde resin, but it is not limited thereto.

[0062] It should be noted that Auxiliary A uses a reactive tackifying resin instead of a non-reactive tackifying resin because the non-reactive tackifying resin cannot crosslink synergistically with the acrylate polymer, that is, it cannot promote the increase in the crosslinking density of the electrostripping composition; moreover, the introduction of the non-reactive tackifying resin will inhibit the crosslinking of the acrylate polymer, resulting in a sharp decrease in the cohesion of the electrostripping composition, and further leading to poor adhesion retention of the adhesive layer formed by the electrostripping composition.

[0063] In some embodiments, when Auxiliary B is a non-UV-curable resin, it includes at least one of an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an aziridine-based crosslinking agent, or a metal chelate-based crosslinking agent; as the non-UV-curable resin, the above substances can all participate in crosslinking with the acrylate polymer, promoting the increase in the crosslinking density of the electrostripping composition so as to increase the cohesion of the electrostripping composition.

[0064] In some embodiments, when Auxiliary B is a UV-curable resin, it includes at least one of epoxy acrylate, polyurethane acrylate, or polyester acrylate; when the above substances are used as the UV-curable resin, they can all participate in crosslinking with the acrylate polymer, further promoting the increase in the crosslinking density of the electrostripping composition so as to make the electrostripping composition have higher cohesion.

[0065] In some embodiments, Auxiliary B is used in combination with a UV-curable resin and a non-UV-curable resin.

[0066] In some embodiments, the anion of the ionic liquid is bis(fluorosulfonyl)imide anion; the bis(fluorosulfonyl)imide anion has high thermal stability and chemical stability and can maintain its performance in a wide temperature and chemical environment; in addition, the bis(fluorosulfonyl)imide anion also helps to increase the conductivity of the electrostripping composition, enabling the adhesive interface to rapidly reduce the adhesive force when a voltage is applied to the adhesive layer formed by the electrostripping composition, thereby realizing the rapid peeling of the adhesive layer from the adherend.

[0067] In some embodiments, the cations of the ionic liquid include at least one of nitrogen-containing onium cations, sulfur-containing onium cations, phosphorus-containing onium cations, imidazolium-based cations, ammonium-based cations, or pyridinium-based cations; the above-mentioned cations all have excellent ionic conductivity and chemical stability, and can migrate rapidly under the action of voltage to endow the adhesive layer formed by the electro-strippable composition with better electro-conductive easy-strippability.

[0068] For example, the ionic liquid in the embodiments of the present application can be obtained from Daiichi Kogyo Seiyaku, Kanto Chemical, Koei Chemical Industry, etc. For example, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (AS-110) can be obtained from Daiichi Kogyo Seiyaku, 1-hexylpyridinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylpyrrolidine bis(trifluoromethanesulfonyl)imide, and 1-ethyl-3-methylimidazolium tetrafluoroborate can be obtained from Kanto Chemical, 1-ethyl-3-methylimidazolium hexafluorophosphate (IL-C3), 1-butylpyridinium tetrafluoroborate (IL-P10), 1-hexylpyridinium bis(trifluoromethanesulfonyl)imide (IL-P14), and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMI-TFSI) can be obtained from Koei Chemical Industry.

[0069] In some embodiments, the solid content of the acrylate polymer is 10-50%; within this solid content range, the acrylate polymer is in a solution state, which is conducive to the dispersion of the ionic liquid and the co-crosslinking with Auxiliary A and Auxiliary B, so that the adhesive layer formed by the electro-strippable composition can take into account both electro-conductive easy-strippability and adhesive holding force.

[0070] In some embodiments, the weight-average molecular weight of the acrylate polymer is 100,000 or more and 5,000,000 or less, preferably 200,000 or more and 4,000,000 or less, more preferably 300,000 or more and 3,000,000 or less; the weight-average molecular weight of the acrylate polymer being 100,000 or more and 5,000,000 or less is conducive to the adhesive layer formed by the electro-strippable composition having lower internal cohesion after being electrified, which is conducive to peeling from the adherend and having no residual colloid after peeling from the adherend, ensuring the recyclability of the adherend.

[0071] It should be noted that the weight-average molecular weight in the embodiments of the present application refers to the value calculated using the GPC (System21) of Shodex with tetrahydrofuran as the mobile phase, and this value is the weight-average molecular weight in terms of polystyrene.

[0072] In some embodiments, the glass transition temperature of the acrylate polymer is 0°C or lower, preferably -20°C or lower, more preferably -40°C or lower. The glass transition temperature of the acrylate polymer being 0°C or lower can improve the initial adhesion force of the adhesive layer formed by the electro-strippable composition during the adhesion process.

[0073] In this embodiment, the glass transition temperature (Tg) can be calculated based on the following formula Ⅳ (Fox formula):

[0074] 1 / Tg = W1 / Tg1 + W2 / Tg2 + ····· + W n / Tg n (Ⅳ)

[0075] Wherein, Tg represents the glass transition temperature of the polymer (unit: K), and Tg i (i = 1, 2, ··· n) represents the glass transition temperature of the homopolymer formed by monomer i (unit: K), and W i (i = 1, 2, ··· n) represents the weight fraction of monomer i in all monomer components. The above formula (Ⅳ) is the calculation formula when the polymer is composed of n monomer components of monomer 1, monomer 2, ···, monomer n. In addition, the glass transition temperature when forming a homopolymer refers to the glass transition temperature of the homopolymer of the monomer, that is, the glass transition temperature (Tg) of the polymer formed by using only a certain monomer as the monomer component.

[0076] In some embodiments, the acrylate polymer is made from a main unit, a functional unit, and an initiator as the main raw materials; wherein, the main unit is an alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms; the alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms as the main unit can ensure the curing and film formation of the electrostripping composition when polymerized to form an acrylate polymer; the functional unit includes a carboxyl-containing acrylate monomer and / or a hydroxyl-containing acrylate monomer. These carboxyl- and / or hydroxyl-containing acrylate monomers as the functional unit can be crosslinked with auxiliary agent A and auxiliary agent B after polymerization with the main unit under the action of the initiator, so that the electrostripping composition can be cured into a film while having a high cohesive force, so as to effectively improve the adhesion retention of the adhesive layer formed by the electrostripping composition; the initiator includes any one of a polymerization thermal initiator and a polymerization photoinitiator. Both the polymerization thermal initiator and the polymerization photoinitiator can initiate the polymerization reaction of monomer molecules, so that monomers such as the main unit and the functional unit can polymerize to form an acrylate polymer.

[0077] In some embodiments, the functional unit can be a single carboxyl-containing acrylate monomer, or a single hydroxyl-containing acrylate monomer, or even a carboxyl / hydroxyl-containing acrylate monomer. The separate or joint introduction of carboxyl and hydroxyl functional groups is beneficial to enhancing the synergistic crosslinking reaction of the acrylate polymer with auxiliary agent A and auxiliary agent B, so that the crosslinking density of the electrostripping composition is significantly increased, which is conducive to improving the adhesion retention of the adhesive layer formed by the electrostripping composition.

[0078] It should be noted that in the embodiments of the present application, the alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms is used as the main unit, and its weight fraction can be 60 to 95 wt% of all monomers of the acrylate polymer; while the functional unit, as the main contributing unit that enables the acrylate polymer to undergo a crosslinking reaction with auxiliary agent A and auxiliary agent B, its weight fraction can be 5 to 30 wt% of all monomers of the acrylate polymer.

[0079] Furthermore, in the alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms in the embodiments of the present application, the alkyl (meth)acrylate refers to methyl acrylate or acrylate. For example, the alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms can be methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isononyl (meth)acrylate, dodecyl (meth)acrylate, etc. These alkyl (meth)acrylates can be used alone or in combination of two or more when preparing the acrylate polymer.

[0080] Furthermore, in the functional unit of the embodiments of the present application, the carboxyl-containing acrylate monomers can be, for example, carboxyl-containing monomers such as acrylic acid, methacrylic acid, and carboxyethyl acrylate, and the hydroxyl-containing acrylate monomers can be, for example, hydroxyl-containing monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and (4-hydroxymethylcyclohexyl)methyl acrylate. The monomers listed in the above functional unit can be used alone or in combination of two or more when preparing the acrylate polymer.

[0081] In some embodiments, when the initiator is a polymerization heat initiator, the mass ratio of the main unit to the functional unit is (70 to 95):(5 to 30); when the mass ratio of the main unit to the functional unit is within this range, polymerization can be carried out under the action of the polymerization heat initiator, and the prepared acrylate polymer can be fully crosslinked with auxiliary agent A and auxiliary agent B to increase the crosslinking density of the electrostripping composition, so that the electrostripping composition has a higher cohesive force, thereby improving the adhesion retention of the adhesive layer formed by the electrostripping composition.

[0082] In some embodiments, when the initiator is a polymerization photoinitiator, the raw materials of the acrylate polymer further include a polyfunctional UV monomer, and its weight fraction can be 0.1-10 wt% of all the monomers of the acrylate polymer. The introduction of the polyfunctional UV monomer is beneficial to the synergistic crosslinking of the UV-curable resin of the auxiliary agent B under the action of the auxiliary agent A, promoting the increase of the crosslinking density of the electrostripping composition, so as to greatly improve the cohesion of the electrostripping composition and significantly improve the adhesion retention of the adhesive layer formed by the electrostripping composition. Moreover, the introduction of the polyfunctional UV monomer is also beneficial to improving the weather resistance of the electrostripping composition, making the adhesive layer formed by it have better adhesion retention.

[0083] Furthermore, the polyfunctional UV monomers in the embodiments of the present application can be, for example, polyethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, etc. When preparing the acrylate polymer, only one of these polyfunctional UV monomers can be used, or two or more can be used in combination.

[0084] In some embodiments, the mass ratio of the main unit, the functional unit and the polyfunctional UV monomer is (60-95):(3-30):(2-10), preferably (60-85):(10-30):(5-10). Within the above mass ratio range, the main unit, the functional unit and the polyfunctional UV monomer can be polymerized under the action of the polymerization photoinitiator, and the prepared acrylate polymer can have the characteristics of both the functional unit and the polyfunctional UV monomer, so as to fully crosslink with the auxiliary agent A and the auxiliary agent B, further improving the cohesion of the stripping composition and thus inhibiting the loss of crosslinking density caused by the introduction of ionic liquids and other non-reactive components.

[0085] In some embodiments, to provide a polymerization reaction environment for monomers such as the main unit and the functional unit, the raw materials of the acrylate polymer further include a polymerization solvent. The polymerization solvent includes at least one of aliphatic hydrocarbons, ester compounds and aromatic hydrocarbons. As the polymerization solvent, the above substances can all provide the reaction environment required for the polymerization of monomers such as the main unit and the functional unit, enabling the monomers to stably form acrylate polymers under the action of the initiator.

[0086] In some embodiments, the polymerization thermal initiator includes any one of azo polymerization initiators such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylpropionamidine) disulfide, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4,4-trimethylpentane), dimethyl 2,2'-azobis(2-methylpropionate), 2,2'-azobis[2-methyl-N-(phenylmethyl)-propionamidine] dihydrochloride, 2,2'-azobis[2-(3,4,5,6-tetrahydropyrimidin-2-yl)propane] dihydrochloride, or 2,2'-azobis[2-(2-imidazolin-2-yl)propane]; or any one of persulfate compounds such as potassium persulfate or ammonium persulfate. As the polymerization thermal initiator, the above substances can all initiate the polymerization reaction of the main unit and the functional unit, and polymerize the main unit and the functional unit to form an acrylate polymer.

[0087] In some embodiments, the polymerization photoinitiator includes any one of type I photoinitiators such as hydroxybenzophenone, alkylaminobenzophenone, benzoin ether, or phosphine oxide; or any one of type II photoinitiators such as benzophenone, substituted benzophenone, anthraquinone, benzoylformate, camphorquinone, or thioxanthone. As the polymerization photoinitiator, the above substances can all initiate the polymerization reaction of the main unit, the functional unit, and the polyfunctional UV monomer, and polymerize the main unit, the functional unit, and the polyfunctional UV monomer to form an acrylate polymer.

[0088] Another embodiment of the present application provides a method for preparing an electrically strippable composition, including:

[0089] Step for preparing an acrylate polymer: mixing and reacting the main unit, the functional unit, and the polymerization solvent with the polymerization thermal initiator in a predetermined ratio to obtain an acrylate polymer A; or mixing and reacting the main unit, the functional unit, the polyfunctional UV monomer, and the polymerization solvent with the polymerization photoinitiator in a predetermined ratio to obtain an acrylate polymer B;

[0090] Step for preparing an electrically strippable composition: mixing and reacting the acrylate polymer A or the acrylate polymer B with the remaining components in a predetermined ratio to obtain an electrically strippable composition.

[0091] It is understandable that the acrylate polymer in this embodiment can be prepared by solution polymerization or UV photopolymerization. When using solution polymerization, the preparation steps of the acrylate polymer are to mix the main unit, the functional unit, and the polymerization solvent with a polymerization thermal initiator in a predetermined ratio and react. During the preparation process, the polymerization solvent can dissolve the main unit and the functional unit, enabling the two to come into full contact in the reaction system, and obtaining the acrylate polymer A through the action of the polymerization thermal initiator; when using UV photopolymerization, the preparation steps of the acrylate polymer are to mix the main unit, the functional unit, the multifunctional UV monomer, and the polymerization solvent with a polymerization photoinitiator in a predetermined ratio and react. The polymerization solvent can dissolve the main unit, the functional unit, and the multifunctional UV monomer, enabling each monomer to come into full contact in the reaction system, and obtaining the acrylate polymer B through the action of the polymerization photoinitiator.

[0092] In the preparation steps of the electro-strippable composition, after the acrylate polymer A or the acrylate polymer B is mixed with the remaining components in a predetermined ratio, uniformly mixed, and degassed, an electro-strippable composition with excellent quality can be obtained.

[0093] In some embodiments, the preparation steps of the acrylate polymer include: mixing the monomer mixture A composed of the main unit and the functional unit with the polymerization solvent at a mass ratio of 1:(1 - 9), and adding a polymerization thermal initiator accounting for 0.2 - 1% of the mass of the monomer mixture A, then heating and reacting to obtain the acrylate polymer A.

[0094] In some preferred embodiments, when using solution polymerization, the preparation steps of the acrylate polymer include: forming the monomer mixture A from the main unit and the functional unit at a mass ratio of (70 - 95):(5 - 30); putting the monomer mixture A and the polymerization solvent into the reaction vessel at a mass ratio of 1:(1 - 9), under nitrogen protection, stirring for 0.5 - 2 h until all the materials are completely dissolved; adding a polymerization thermal initiator accounting for 0.2 - 1% of the mass of the monomer mixture, heating to 60 - 90 °C while stirring and reacting for 4 - 10 h to obtain the acrylate polymer A.

[0095] In some embodiments, the preparation steps of the acrylate polymer specifically include: mixing the monomer mixture B composed of the main unit, the functional unit, and the multifunctional UV monomer with the polymerization solvent at a mass ratio of 1:(1 - 9), and adding a polymerization photoinitiator accounting for 1 - 5% of the mass of the monomer mixture B and reacting under a UV light irradiation environment to obtain the acrylate polymer B.

[0096] In some preferred embodiments, when the UV photopolymerization method is adopted, the preparation steps of the acrylate polymer include: forming a monomer mixture B by mixing a main unit, a functional unit and a polyfunctional UV monomer in a mass ratio of (60-95):(3-30):(2-10); putting the monomer mixture B and a polymerization solvent into a reaction vessel in a mass ratio of 1:(1-9), adding a polymerization photoinitiator accounting for 1-5% of the mass of the monomer mixture, and stirring for 0.5-2 h under nitrogen protection until all materials are completely dissolved; irradiating the reaction vessel with 365 nm UV-LED for 10-30 min while stirring to obtain an acrylate polymer B.

[0097] In some embodiments, in the preparation steps of the electrically peelable composition, when the acrylate polymer B and the remaining components are mixed and reacted in a predetermined ratio, the remaining components further include a polymerization photoinitiator accounting for 1-5% of the total mass of the acrylate polymer B. By further adding a polymerization photoinitiator accounting for 1-5% of the total mass of the acrylate polymer B in the preparation steps of the electrically peelable composition, it is possible to make the electrically peelable composition more likely to form an adhesive layer during the curing and film-forming process.

[0098] Another embodiment of the present application provides an adhesive article, including a substrate and an adhesive layer formed by covering the substrate surface with the above-mentioned electrically peelable composition or the electrically peelable composition prepared by the above preparation method.

[0099] It should be noted that the substrate of the adhesive article is preferably a conductive object. For example, the conductive object can specifically be a conductive adherend, a conductive auxiliary material, a conductive substrate or a conductive fixing object, so as to facilitate the conduction of current to the adhesive layer formed by the electrically peelable composition and make the adhesive layer easier to peel from the adherend.

[0100] In addition, the adhesive article provided by the embodiment of the present application can be an adhesive sheet or an adhesive tape; taking the adhesive tape as an example, in the preparation process, the above-mentioned electrically peelable composition can be coated on the surface of a polyester film subjected to a release treatment and dried to form an adhesive layer to obtain an adhesive tape. The adhesive tape can be pasted in a manner of contacting a conductive object. When a voltage of 12 V is applied to the adhesive layer formed by the electrically peelable composition for 30 seconds, the adhesive layer can be peeled from the directly pasted conductive object without residual glue.

[0101] Hereinafter, specific embodiments will be used to describe the implementation scheme of the present application in detail. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. For those not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. Those reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0102] Example 1

[0103] Steps for preparing acrylate polymer: Put a monomer mixture composed of 75 parts of n-butyl acrylate, 20 parts of methyl acrylate and 5 parts of 2-hydroxyethyl acrylate and 150 parts of polymerization solvent into a four-necked flask. Stir for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent consists of 135 parts of ethyl acetate and 15 parts of toluene. Then add 0.3 part of polymerization heat initiator azobisisobutyronitrile (AIBN). Raise the temperature to 80 - 85 °C under stirring and react for 5 hours to obtain an acrylate polymer with a solid content of 40%.

[0104] Steps for preparing electrostrippable composition: Mix the above acrylate polymer with 1 part of isocyanate crosslinking agent TG-1, 5 parts of ionic liquid EMIBF4 and 20 parts of reactive tackifying resin (resin of formula II). Disperse at high speed for 5 minutes using a high-speed mixer at room temperature and defoam to obtain adhesive composition A1.

[0105] Example 2

[0106] Steps for preparing acrylate polymer: Put a monomer mixture composed of 85 parts of n-butyl acrylate, 10 parts of acrylic acid and 5 parts of 2-hydroxyethyl acrylate and 150 parts of polymerization solvent into a four-necked flask. Stir for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent consists of 135 parts of ethyl acetate and 15 parts of toluene. Then add 0.3 part of polymerization heat initiator azobisisobutyronitrile (AIBN). Raise the temperature to 80 - 85 °C under stirring and react for 5 hours to obtain an acrylate polymer with a solid content of 40%.

[0107] Steps for preparing electrostrippable composition: Mix the above acrylate polymer with 1 part of epoxy crosslinking agent TG-6, 5 parts of ionic liquid EMIBF4 and 20 parts of reactive tackifying resin ARDYME R-9520. Disperse at high speed for 5 minutes using a high-speed mixer at room temperature and defoam to obtain adhesive composition A2.

[0108] Example 3

[0109] Steps for preparing acrylate polymer: Put a monomer mixture composed of 80 parts of n-butyl acrylate, 10 parts of acrylic acid, 5 parts of 2-hydroxyethyl acrylate and 5 parts of 1,6-hexanediol diacrylate and 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask. Stir for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate. Then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0110] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate CN007, 5 parts of ionic liquid AS-110, 20 parts of reactive tackifying resin (resin of formula I), and 3 parts of hydroxycyclohexanone benzophenone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition A3.

[0111] Example 4

[0112] Preparation steps of the acrylate polymer: Put the monomer mixture composed of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate, and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent, and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask, stir for 1 h under nitrogen protection until all materials are completely dissolved, where the polymerization solvent is 150 parts of ethyl acetate; then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0113] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate 6145-100, 5 parts of ionic liquid EMIBF4, 20 parts of reactive tackifying resin (resin of formula II), and 3 parts of hydroxycyclohexanone benzophenone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition A4.

[0114] Example 5

[0115] Preparation steps of the acrylate polymer: Put the monomer mixture composed of 70 parts of n-butyl acrylate, 10 parts of acrylic acid, 10 parts of 2-hydroxyethyl acrylate, 5 parts of 1,6-hexanediol diacrylate, and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent, and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask, stir for 1 h under nitrogen protection until all materials are completely dissolved, where the polymerization solvent is 150 parts of ethyl acetate; then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0116] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate 6145-100, 5 parts of ionic liquid EMIBF4, 20 parts of reactive tackifying resin (resin of formula III), and 3 parts of hydroxycyclohexanone benzophenone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition A5.

[0117] Example 6

[0118] Preparation steps of acrylate polymer: A monomer mixture composed of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0119] Preparation steps of electro-strippable composition: The above acrylate polymer is mixed with 0.5 part of isocyanate crosslinking agent TG-1, 1.5 parts of polyurethane acrylate 6145-100, 10 parts of ionic liquid AS-110, 20 parts of reactive tackifying resin (Formula II resin) and 3 parts of hydroxycyclohexanone benzophenone, and dispersed at high speed for 5 minutes by a high-speed mixer at room temperature, and degassed to obtain adhesive composition A6.

[0120] Example 7

[0121] Preparation steps of acrylate polymer: A monomer mixture composed of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0122] Preparation steps of electro-strippable composition: The above acrylate polymer is mixed with 2 parts of polyurethane acrylate 6145-100, 20 parts of ionic liquid EMIBF4, 20 parts of reactive tackifying resin (Formula II resin) and 3 parts of hydroxycyclohexanone benzophenone, and dispersed at high speed for 5 minutes by a high-speed mixer at room temperature, and degassed to obtain adhesive composition A7.

[0123] Example 8

[0124] Preparation steps of acrylate polymer: A monomer mixture composed of 80 parts of n-butyl acrylate, 10 parts of acrylic acid, 5 parts of 2-hydroxyethyl acrylate and 5 parts of 1,6-hexanediol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0125] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate CN007, 5 parts of ionic liquid AS-110, 30 parts of reactive tackifying resin (resin of formula I), and 3 parts of hydroxycyclohexanone phenyl ketone, disperse at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition A8.

[0126] Example 9

[0127] Preparation steps of the acrylate polymer: Put a monomer mixture composed of 80 parts of n-butyl acrylate, 10 parts of acrylic acid, 5 parts of 2-hydroxyethyl acrylate, and 5 parts of 1,6-hexanediol diacrylate, 150 parts of polymerization solvent, and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask, stir under nitrogen protection for 1 h until all materials are completely dissolved, where the polymerization solvent is 150 parts of ethyl acetate; then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0128] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate CN007, 5 parts of ionic liquid EMIBF4, 10 parts of reactive tackifying resin (resin of formula I), and 3 parts of hydroxycyclohexanone phenyl ketone, disperse at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition A9.

[0129] Comparative Example 1

[0130] Preparation steps of the acrylate polymer: Put a monomer mixture composed of 85 parts of n-butyl acrylate, 10 parts of acrylic acid, and 5 parts of 2-hydroxyethyl acrylate and 150 parts of polymerization solvent into a four-necked flask, stir under nitrogen protection for 1 h until all materials are completely dissolved, where the polymerization solvent consists of 135 parts of ethyl acetate and 15 parts of toluene; then add 0.3 part of polymerization thermal initiator azobisisobutyronitrile (AIBN), and react at 80 - 85 °C for 5 hours under stirring to obtain an acrylate polymer with a solid content of 40%.

[0131] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 1 part of epoxy crosslinking agent TG-6, 5 parts of ionic liquid EMIBF4, and 20 parts of non-reactive tackifying resin GA-85, disperse at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition B1.

[0132] Comparative Example 2

[0133] Preparation steps of acrylate polymer: A monomer mixture consisting of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0134] Preparation steps of electro-strippable composition: The above acrylate polymer is mixed with 5 parts of ionic liquid AS-110, 20 parts of non-reactive tackifying resin GA-85 and 3 parts of hydroxycyclohexanone benzophenone, and dispersed at high speed for 5 minutes by a high-speed mixer at room temperature, and defoamed to obtain adhesive composition B2.

[0135] Comparative Example 3

[0136] Preparation steps of acrylate polymer: A monomer mixture consisting of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0137] Preparation steps of electro-strippable composition: The above acrylate polymer is mixed with 2 parts of polyurethane acrylate 6145-100, 5 parts of ionic liquid EMIBF4, 5 parts of reactive tackifying resin (resin of formula II) and 3 parts of hydroxycyclohexanone benzophenone, and dispersed at high speed for 5 minutes by a high-speed mixer at room temperature, and defoamed to obtain adhesive composition B3.

[0138] Comparative Example 4

[0139] Preparation steps of acrylate polymer: A monomer mixture consisting of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone are put into a four-necked flask, and stirred for 1 h under nitrogen protection until all materials are completely dissolved. The polymerization solvent is 150 parts of ethyl acetate; then irradiated with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0140] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate 6145-100, 5 parts of ionic liquid EMIBF4, 40 parts of reactive tackifying resin (Formula II resin), and 3 parts of hydroxycyclohexanone phenyl ketone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition B4.

[0141] Comparative Example 5

[0142] Preparation steps of the acrylate polymer: Put the monomer mixture composed of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate, and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent, and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask, stir under nitrogen protection for 1 h until all materials are completely dissolved, where the polymerization solvent is 150 parts of ethyl acetate; then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0143] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 2 parts of polyurethane acrylate 6145-100, 5 parts of ionic liquid AS-110, and 3 parts of hydroxycyclohexanone phenyl ketone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition B5.

[0144] Comparative Example 6

[0145] Preparation steps of the acrylate polymer: Put the monomer mixture composed of 60 parts of n-butyl acrylate, 20 parts of methyl acrylate, 15 parts of 2-hydroxyethyl acrylate, and 5 parts of polyethylene glycol diacrylate, 150 parts of polymerization solvent, and 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone into a four-necked flask, stir under nitrogen protection for 1 h until all materials are completely dissolved, where the polymerization solvent is 150 parts of ethyl acetate; then irradiate with 365 nm UV-LED for 20 minutes under stirring to obtain an acrylate polymer with a solid content of 40%.

[0146] Preparation steps of the electro-strippable composition: Mix the above acrylate polymer with 5 parts of ionic liquid EMIBF4, 20 parts of reactive tackifying resin (Formula II resin), and 3 parts of hydroxycyclohexanone phenyl ketone, disperse them at high speed for 5 minutes using a high-speed mixer at room temperature, and defoam to obtain the adhesive composition B6.

[0147] It should be noted that the n-butyl acrylate and methyl acrylate in the (meth)acrylic acid alkyl ester monomers used in the above examples and comparative examples are both sourced from Formosa Plastics Zhejiang; the acrylic acid in the carboxyl-containing acrylate monomers is sourced from Wanhua; the 2-hydroxyethyl acrylate in the hydroxyl-containing acrylate monomers is sourced from Jiangsu Jurong; the 1,6-hexanediol diacrylate and polyethylene glycol diacrylate in the multi-functional UV monomers are sourced from Changxing Chemical; among the initiators, 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173 polymerization photoinitiator) and hydroxycyclohexanone phenyl ketone (184 polymerization photoinitiator) are both commercially available polymerization photoinitiators; in the auxiliary B, the isocyanate crosslinking agent TG-1 and the epoxy crosslinking agent TG-6 are both sourced from Taylors Chemicals, the polyurethane acrylate is sourced from Sartomer Chemical CN007, and the polyurethane acrylate is sourced from Changxing Chemical 6145-100; the ionic liquid EMIBF4 is sourced from Kanto Chemical Co., Inc., and the ionic liquid AS-110 is sourced from Daiichi Kogyo Seiyaku Co., Ltd.; in the auxiliary A, the reactive tackifying resin ARDYME R-9520 (rosin carboxyl-containing tackifying resin) is sourced from Arakawa Chemical, the reactive tackifying resin (resin of formula I) is sourced from Yiqing Chemical TSR-6000, the non-reactive tackifying resin GA-85 is sourced from Arakawa Chemical, and the reactive tackifying resins (resin of formula II) and (resin of formula III) are self-made. Among them, the resin of formula II is obtained by disproportionating rosin (R in the resin of formula II is acryloyloxy), and the resin of formula III is obtained by modifying p-tert-octylphenol formaldehyde resin.

[0148] The component information statistics of the electro-strippable compositions A1 to B6 in the above examples and comparative examples are shown in Table 1 below:

[0149] Table 1. Statistical Table of Component Information of Electro-Strippable Compositions

[0150]

[0151]

[0152] To verify the performance of the electro-strippable compositions A1 to B6 prepared in the above examples and comparative examples, the electro-strippable compositions A1 to B6 were respectively made into adhesive products, and the preparation process is as follows:

[0153] The electro-strippable compositions A1, A2 and B1 were respectively coated on a polyethylene terephthalate film PET (thickness 50 μm) with a surface release treatment, and then dried at 80 °C for 3 minutes to obtain an electro-strippable adhesive layer with a dry film thickness of 50 μm, and then cured at 40 °C for 3 days. Finally, a release film was set on the surface of the adhesive layer to obtain an adhesive product. And,

[0154] The electro-strippable compositions A3 to A8 and B2 to B6 were respectively coated onto a surface-treated polyethylene terephthalate film PET (thickness 50 μm), and then cured by light irradiation under a 365 nm UV-LED lamp for 3 minutes to obtain an electro-strippable adhesive layer with a dry film thickness of 50 μm. Then, a release film was provided on the surface of the adhesive layer to obtain an adhesive product.

[0155] The adhesive products prepared from the electro-strippable compositions A1 to B6 in each example and comparative example were respectively subjected to performance tests. Taking the test process of any one of the adhesive products of A1 to B6 as an example, the test methods include:

[0156] Test of initial peel strength: Prepare 3 samples with a size of 25 mm × 100 mm; Tear off one side of the release film, and stick the pressure-sensitive surface to the non-release-treated PET film well, avoiding bubbles and wrinkles; Use a 2 kg roller to roll back and forth at a speed of 300 mm / min for 3 passes; Tear off the release film on the other side, and stick the pressure-sensitive surface on the other side to the steel plate well, avoiding bubbles and wrinkles; Use a 2 kg roller to roll back and forth at a speed of 300 mm / min for 3 passes, and leave it standing at room temperature for 30 min; Stick a special test tape to the back of the PET film; Fix one end of the steel plate on the lower fixture of the tensile machine and perpendicular to the horizontal plane, and zero the equipment; The test rate is 300 mm / min, and the ∠180° peel force is tested; Take the average value of a 60 mm long section after stabilization.

[0157] Test of peel strength after electrification: Prepare 3 samples with a size of 25 mm × 100 mm; Tear off one side of the release film, and stick the pressure-sensitive surface to the aluminum foil well, avoiding bubbles and wrinkles; After using a 2 kg roller to roll back and forth at a speed of 300 mm / min for 3 passes, cut a sample strip from the aluminum foil; Tear off the release film on the other side, and stick the pressure-sensitive surface on the other side to the steel plate well, avoiding bubbles and wrinkles; Use a 2 kg roller to roll back and forth at a speed of 300 mm / min for 3 passes, and leave it standing at room temperature for 30 min; Stick a special test tape to the back of the aluminum foil, install a 12 V electrode, and energize for 30 S, with the steel plate side as the negative electrode and the aluminum foil side as the positive electrode. After electrification, fix one end of the steel plate on the lower fixture of the tensile machine and perpendicular to the horizontal plane, and zero the equipment; The test rate is 300 mm / min, and the ∠180° peel force is tested; Take the average value of a 60 mm long section after stabilization;

[0158] Test of room temperature and high temperature holding force: Prepare 3 samples with the size of 25mm×100mm; Tear off the release film on one side and stick the adhesive product on a special stainless steel plate with length marks. The bonding length is 25mm, ensure no bubbles and it is in the center of the steel plate; Use a 2kg pressure roller to press back and forth at a speed of 300mm / min, cure at room temperature for 20min; After fixing with a stapler, hang it on the room temperature or high temperature (70℃) holding force equipment and apply a 1Kg counterweight, record the time when the adhesive product falls off the stainless steel plate.

[0159] The test results of the adhesive products prepared from the electro-strippable compositions A1 to B6 in each example and comparative example are summarized in Table 2 below.

[0160] Table 2. Statistical table of performance test data of adhesive products

[0161]

[0162]

[0163] Analyze the advantages of the examples of this application by combining Table 1 and Table 2.

[0164] As can be seen from Table 1 and Table 2, compared with Example 2, in Comparative Example 1, the non-reactive tackifying resin GA-85 was used as Auxiliary A. The non-reactive tackifying resin GA-85 cannot participate in the cross-linking reaction of the acrylate polymer synergistically with Auxiliary B. Although the adhesive product prepared has good initial peel strength and low peel strength after electrification, its room temperature holding time is only 10h and the high temperature holding time is only 0.5h, both of which are shorter than those of Example 2; On the contrary, in Example 2, the reactive tackifying resin ARDYME R-9520 was used as Auxiliary A. While the adhesive product prepared has good initial peel strength and low peel strength after electrification, its room temperature holding time is 590h and the high temperature holding time is 590h. Example 2 has higher room temperature and high temperature holding strengths compared with Comparative Example 1. This shows that when Auxiliary A accounts for 10% to 30% of the total weight of the acrylate polymer and the mass ratio of Auxiliary A to Auxiliary B is (10 to 30):(1 to 10), Auxiliary A and Auxiliary B can cross-link synergistically with the acrylate polymer, enabling the adhesive layer formed by the electro-strippable composition to maintain high peel strength before electrification and easy peel after electrification, while also having high adhesive holding force.

[0165] Comparative Example 2 is compared with Example 4. In Comparative Example 2, a non-reactive tackifying resin GA-85 is used as Additive A, and Additive B is not used. Although the obtained adhesive product has good initial peel strength and low peel strength after electrification, its room temperature retention time is only 6 h and its high temperature retention time is only 0.2 h, both of which are shorter than those of Example 4. On the contrary, in Example 4, a reactive tackifying resin (Formula II resin) is used as Additive A, and polyurethane acrylate 6145-100 is used as Additive B. While the obtained adhesive product has good initial peel strength and low peel strength after electrification, its room temperature retention time is 780 h and its high temperature retention time is 780 h. Example 4 has higher room temperature and high temperature adhesion retention strengths compared with Comparative Example 2. This shows that when Additive A accounts for 10% to 30% of the total weight of the acrylate polymer and the mass ratio of Additive A to Additive B is (10 to 30):(1 to 10), Additive A and Additive B can crosslink synergistically with the acrylate polymer, enabling the adhesive layer formed by the electro-peelable composition to maintain high peel strength before electrification and easy peelability after electrification, while also having high adhesion retention force.

[0166] Comparative Example 3 is compared with Example 4. In Comparative Example 3, although a reactive tackifying resin (Formula II resin) is used as Additive A, the dosage of Additive A is too low. Additive A accounts for only 5% of the total weight of the acrylate polymer, and the mass ratio of Additive A to Additive B is 5:2. The crosslinking effect of Additive A and Additive B participating in the acrylate polymer synergistically is poor. Compared with A4, the initial peel strength of the adhesive layer formed by the electro-peelable composition B3 prepared in Comparative Example 3 is lower, only 0.6529 N / mm, and it is easy to peel from the adherend. Its room temperature retention time is 480 h and its high temperature retention time is only 480 h, both of which are shorter than those of Example 4. On the contrary, in Example 4, a reactive tackifying resin (Formula II resin) is used as Additive A, Additive A accounts for 20% of the total weight of the acrylate polymer, and the mass ratio of Additive A to Additive B is 20:2. While the obtained adhesive product has good initial peel strength and low peel strength after electrification, its room temperature retention time is 780 h and its high temperature retention time is 780 h. Example 4 has higher room temperature and high temperature adhesion retention strengths compared with Comparative Example 3. This shows that when Additive A accounts for 10% to 30% of the total weight of the acrylate polymer and the mass ratio of Additive A to Additive B is (10 to 30):(1 to 10), Additive A and Additive B can crosslink synergistically with the acrylate polymer, enabling the adhesive layer formed by the electro-peelable composition to maintain high peel strength before electrification and easy peelability after electrification, while also having high adhesion retention force.

[0167] Comparative Example 4 is compared with Example 4. In Comparative Example 4, although a reactive tackifying resin (Formula II resin) is used as Auxiliary A, the dosage of Auxiliary A is too high. The content of Auxiliary A accounts for up to 40% of the total weight of the acrylate polymer, and the mass ratio of Auxiliary A to Auxiliary B is 40:2. As a result, the cohesive strength of the electro-strippable composition B4 decays severely. Compared with A4, the initial peel strength of the adhesive layer formed by the electro-strippable composition B4 prepared in Comparative Example 4 is lower, which is 0.7537 N / mm. After electrification, the peel strength is higher, and it cannot be well peeled from the adherend. Moreover, its room temperature holding time is only 24 h, and the high temperature holding time is only 10 h, both of which are shorter than those in Example 4.

[0168] Comparative Example 5 is compared with Example 4. In Comparative Example 5, polyurethane acrylate 6145-100 is used as Auxiliary B, and Auxiliary A is not added. Although the adhesive product prepared has good initial peel strength and low peel strength after electrification, its room temperature holding time is only 10 h, and the high temperature holding time is only 2 h, both of which are shorter than those in Example 4.

[0169] Comparative Example 6 is compared with Example 4. In Comparative Example 6, although a reactive tackifying resin (Formula II resin) is used as Auxiliary A, Auxiliary B is not added. Although the adhesive product prepared has good initial peel strength and low peel strength after electrification, its room temperature holding time is only 20 h, and the high temperature holding time is only 3 h, both of which are shorter than those in Example 4. On the contrary, in Example 4, UV-curable resin polyurethane acrylate 6145-100 is used as Auxiliary B, enabling Auxiliary B and the acrylate polymer to carry out synergistic crosslinking. Example 4 has higher bonding holding strengths at room temperature and high temperature compared with Comparative Example 6.

[0170] In Examples 5 to 9, by adjusting the types and ratios of the monomers for preparing the acrylate polymer, as well as the types and ratios of the other components, the adhesive layer formed by the electro-strippable composition prepared can also maintain high peel strength before electrification and easy peelability after electrification, and at the same time, has relatively high bonding holding force.

[0171] In summary, through the synergistic compatibility of raw material components such as acrylate polymer, ionic liquid, Auxiliary A, and Auxiliary B in the electro-strippable composition provided in the embodiments of the present application, the cohesive strength of the electro-strippable composition is significantly improved. The adhesive layer formed by the electro-strippable composition has high peel strength and bonding holding force before electrification, and is easy to be peeled from the adherend after electrification, so that the adhesive product made of the electro-strippable composition can have both easy peelability after electrification and excellent adhesive performance.

[0172] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such combination does not exist in contradiction.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electro-stripping composition, characterized in that: The invention comprises the following components: acrylic polymer, ionic liquid, auxiliary agent A and auxiliary agent B; The auxiliary agent A accounts for 10% to 30% of the total weight of the acrylic polymer; The mass ratio of the auxiliary agent A to the auxiliary agent B is (10-30): (1-10); Wherein, the auxiliary agent A and the auxiliary agent B are used for coordinated cross-linking reaction with the acrylic ester polymer; The auxiliary agent A is a reactive tackifying resin, including at least one of the resins represented by the following formula I, formula II, and formula III, Wherein, R1 represents phenyl, cyclohexyl or methylene, R2 represents methyl, hydroxyl, vinyl, carboxyl, epoxy, mercapto or acryloyloxy, and R represents methyl, hydroxyl, vinyl, carboxyl, epoxy, mercapto or acryloyloxy; The auxiliary agent B includes a UV curable resin and / or a non-UV curable resin; when the auxiliary agent B is a non-UV curable resin, it includes at least one of an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent or a metal chelate crosslinking agent; or when the auxiliary agent B is a UV curable resin, it includes at least one of epoxy acrylate, polyurethane acrylate or polyester acrylate.

2. The electro-stripping composition according to claim 1, characterized in that Satisfy at least one of the following conditions A to G: A. In parts by weight, relative to 100 parts of acrylic ester polymer, the components of the electro-stripping composition include 2 to 30 parts of the ionic liquid, 10 to 30 parts of the auxiliary agent A, and 1 to 10 parts of the auxiliary agent B; B. The auxiliary agent A comprises a linear resin containing active functional groups, and its molecular weight is 200-1000; C. The anion of the ionic liquid is a bis(fluorosulfonyl)imide anion; D. The cation of the ionic liquid includes at least one of a nitrogen-containing onium cation, a sulfur-containing onium cation, and a phosphorus-containing onium cation; E. The solid content of the acrylic polymer is 10-50%; F. The weight average molecular weight of the acrylic polymer is greater than 100,000 and less than 5,000,000; G. The glass transition temperature of the acrylic polymer is 0° C. or lower.

3. The electro-stripping composition according to claim 1, characterized in that The acrylic polymer is made of a main unit, a functional unit and an initiator as main raw materials; Wherein, the main unit is an alkyl (meth)acrylate containing an alkyl group with 1 to 14 carbon atoms; The functional unit includes a carboxyl-containing acrylate monomer and / or a hydroxyl-containing acrylate monomer; The initiator includes any one of a thermal polymerization initiator and a photopolymerization initiator.

4. The electro-stripping composition according to claim 3, characterized in that Meet one or more of the following conditions H~L: H. When the initiator is a thermal polymerization initiator, the mass ratio of the main unit to the functional unit is (70-95): (5-30); I. When the initiator is a polymerization photoinitiator, the raw material of the acrylic polymer further comprises a multifunctional UV monomer; the mass ratio of the main unit, the functional unit and the multifunctional UV monomer is (60-95): (3-30): (2-10); J. The raw material of the acrylic ester polymer further includes a polymerization solvent, and the polymerization solvent includes at least one of aliphatic hydrocarbons, ester compounds and aromatic hydrocarbons; K. The thermal polymerization initiator includes azo polymerization initiators 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylpropionamidine) disulfide, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4,4-trimethylol) any one of dimethylpentane), dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis[2-methyl-N-(phenylmethyl)-propionamidine] dihydrochloride, 2,2'-azobis[2-(3,4,5,6-tetrahydropyrimidin-2-yl)propane] dihydrochloride or 2,2'-azobis[2-(2-imidazolin-2-yl)propane], or any one of the persulfate compounds potassium persulfate or ammonium persulfate; L. The polymerization photoinitiator includes any one of the type I photoinitiators hydroxyacetophenone, alkylaminoacetophenone, benzoin ether or phosphine oxide, or any one of the type II initiators benzophenone, substituted benzophenone, anthraquinone, benzoylformate, camphorquinone or thioxanthone.

5. A method for preparing an electro-stripping composition according to any one of claims 1 to 4, characterized in that: include: Preparation steps of acrylate polymer: mixing the main unit, the functional unit and the polymerization solvent with a polymerization thermal initiator in a predetermined ratio to obtain acrylate polymer A; or mixing the main unit, the functional unit, the multifunctional UV monomer and the polymerization solvent with a polymerization photoinitiator in a predetermined ratio to obtain acrylate polymer B; The step of preparing the electro-stripping composition is as follows: the acrylate polymer A or the acrylate polymer B is mixed with other components in a predetermined ratio to obtain the electro-stripping composition.

6. The method for preparing an electro-stripping composition according to claim 5, characterized in that: The acrylic acid ester polymer preparation step specifically comprises: Mixing a monomer mixture A consisting of a main unit and a functional unit with a polymerization solvent in a mass ratio of 1:(1-9), adding a polymerization thermal initiator in an amount of 0.2-1% by mass of the monomer mixture A and heating the mixture to react, thereby obtaining an acrylic ester polymer A; or, A monomer mixture B consisting of a main unit, a functional unit and a multifunctional UV monomer is mixed with a polymerization solvent in a mass ratio of 1:(1-9), and a polymerization photoinitiator is added in an amount of 1-5% by mass of the monomer mixture B to react under UV light to obtain an acrylate polymer B.

7. The method for preparing an electro-stripping composition according to claim 5, characterized in that: In the step of preparing the electro-stripping composition, when the acrylate polymer B is mixed with other components in a predetermined ratio for reaction, the other components further include a polymerization photoinitiator accounting for 1-5% of the total mass of the acrylate polymer B.

8. A bonding product, characterized in that: An adhesive layer is prepared by the electro-stripping composition according to any one of claims 1 to 4 or the electro-stripping composition prepared by the preparation method according to any one of claims 5 to 7.

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