Photocurable electro-easy-peeling adhesive tape and method for manufacturing the same

Abstract

This invention relates to the field of adhesive tape technology and discloses a photocurable electro-electro-activated easy-peel tape and its preparation method. The photocurable electro-electro-activated easy-peel tape of this invention is composed of a photocurable electro-electro-activated easy-peel adhesive layer, a metallized PET layer, a pressure-sensitive adhesive layer, etc.; the adhesive includes 100 parts by weight of vinyl monomer, 3-20 parts by weight of polyester-based ionic liquid, 10-40 parts by weight of modified polyether polyol conductive agent, etc. When a low voltage is applied, under the drive of the electric field, the anions and cations of the ionic liquid move directionally along the direction of the electric field in the ion pathway formed by the modified polyether polyol conductive agent, forming an interfacial electrochemical reaction, which weakens the interaction force between the adhesive molecular chains and the substrate, breaks the physical and chemical adhesion between the adhesive and the substrate, reduces the interfacial adhesion strength, and achieves a greatly reduced peel strength under ultra-low voltage, with no adhesive residue during peeling, achieving a controllable and damage-free tape peeling effect.

Description

Technical Field

[0001] This invention relates to the field of adhesive tape technology, specifically to a photocurable electro-electrolytic easy-peel adhesive tape and its preparation method. Background Technology

[0002] Acrylic resin adhesives are widely used in electronics, automobiles, and home appliances due to their excellent chemical resistance, adhesion, and resistance to damp heat. To meet the needs of electronic product components for easy disassembly and reassembly with convenient protection, and to facilitate easy recycling, the development of easy-peel tapes has become a research hotspot.

[0003] Electro-reducing easy-peel tapes possess ion transport capabilities; upon applying voltage, the adhesive's bonding performance significantly decreases, exhibiting an electro-reducing peel effect. They have wide applications in electronics, semiconductor wafers, flexible substrates, and optical components. Patent application CN120383899A discloses an electro-reducing adhesive, tape, and its preparation method. Using acrylate polymers, sulfonamides, tetrafluoroborate plasma liquids, and curing agents as raw materials, the prepared electro-reducing adhesive exhibits good adhesive strength and peel performance. However, this patent requires applying a relatively high voltage of 30V, which could affect the performance of precision substrates such as flexible substrates and optical components. Summary of the Invention

[0004] (a) Technical problems to be solved:

[0005] To address the shortcomings of existing technologies, this invention provides a photocurable electro-electro-activated easy-peel tape and its preparation method, which solves the problem that existing acrylic resin tapes are difficult to peel off and leave adhesive residue during peeling.

[0006] (II) Technical Solution: A photocurable electro-electro ...

[0007] The preparation method of photocurable electro-electro ...

[0008] Preferably, the prepolymerization time is 12-20 min.

[0009] Preferably, the curing time is 150-210 seconds.

[0010] Preferably, the vinyl monomer includes any one or combination of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, isobornyl acrylate, hydroxypropyl acrylate, or hydroxyethyl acrylate.

[0011] Preferably, the photoinitiator is one or more of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenylpropanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0012] Preferably, the crosslinking agent is one or more of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, and divinylbenzene.

[0013] The preferred method for preparing polyester-based ionic liquids is as follows: (1) Add acetonitrile, trimethylolpropane trichloroacetic acid and N-methylimidazole to a reaction flask equipped with a reflux condenser, heat to 75-85℃, stir for 72-96h, distill under reduced pressure, extract and wash the crude product with ethyl acetate, dry, and obtain the ionic liquid precursor.

[0014] (2) Add acetonitrile, ionic liquid precursor, inorganic salt, and water to the reaction flask. Stir the reaction at 20-30℃ for 18-24 h. After vacuum distillation, extract and wash the product with dichloromethane, and dry to obtain the polyester-based ionic liquid. The preparation reaction formula is: .

[0015] Preferably, in (1), the molar ratio of trimethylolpropane trichloroacetic acid and N-methylimidazole is 1:(3-3.3).

[0016] Preferably, in (2), the molar ratio of the ionic liquid precursor to the inorganic salt is 1:(3-3.3).

[0017] Preferably, the inorganic salt in (2) is sodium tetrafluoroborate, potassium hexafluorophosphate or lithium bis(trifluoromethanesulfonyl)imide.

[0018] Preferably, the modified polyether polyol conductive agent is prepared as follows: In an ice-water bath, dichloromethane, polyether polyol, triethylamine, and acyl chloride are added to a flask. The mixture is then stirred and reacted at 20-30°C for 18-24 hours. After filtration, the filtrate is extracted and washed with a saturated sodium chloride solution. The organic phase is then distilled under reduced pressure to remove low-boiling substances, and dried to obtain the modified polyether polyol conductive agent. The reaction formula is: .

[0019] Preferably, the molar ratio of polyether polyol, triethylamine, and acyl chloride is 1:(2-2.1):(2-2.4).

[0020] Preferably, the polyether polyol is polyethylene glycol, polypropylene glycol, or polytetrahydrofuran ether glycol.

[0021] Preferably, the acyl chloride is acetyl chloride, propionyl chloride, n-butyryl chloride, isobutyryl chloride, valeryl chloride, isovaleryl chloride, or hexanoyl chloride.

[0022] (III) Beneficial technical effects of the present invention: Polyester-based ionic liquid and modified polyether polyol conductive agent are added to acrylic resin light-curing adhesive. Both the ionic liquid and the modified polyether polyol contain multiple ester groups. They have good compatibility with the acrylic resin matrix. When added to the acrylic resin adhesive, they have little effect on the adhesive performance of the adhesive and still maintain good 180° peel strength and tack.

[0023] The modified polyether polyol conductive agent of this invention forms a continuous ionic pathway in the adhesive tape. The polyester-based ionic liquid contains multiple ionic salt groups, possessing more directionally movable charges. Upon energization, driven by an electric field, the anions and cations of the ionic liquid freely move and migrate directionally along the direction of the electric field within the ionic pathway formed by the modified polyether polyol conductive agent, resulting in an interfacial electrochemical reaction. Ions aggregated at the interface form a solvation layer between the adhesive molecular chains, inducing localized swelling of the adhesive surface. The volume expansion caused by this swelling creates internal stress at the interface, weakening the adhesive. The van der Waals forces and hydrogen bonds between the molecular chains and the substrate break the physical and chemical bonds between the adhesive and the substrate, tearing the contact points between the adhesive and the substrate, thereby reducing the interfacial bond strength. Through the ion migration effect and the interfacial weakening effect, the debonding speed and degree increase after energizing, significantly reducing the peel strength between the tape and the substrate. This achieves the effect of peeling off the tape without residue and with controllable and damage-free peeling under ultra-low voltage. The ultra-low voltage has less impact on the performance of precision substrates such as electronic appliances, flexible substrates, and optical components. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a photocurable electro-electrolytic easy-peel tape. Detailed Implementation

[0025] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0026] Trimethylolpropane triester of chloroacetic acid was prepared according to the method described in the master's thesis "Synthesis and Performance Study of Tripod-type Compounds" from the Chinese Academy of Forestry Sciences. The structural formula is as follows: .

[0027] Example 1: (1) Add 20 mL of acetonitrile, 30 mmol of trimethylolpropane chloroacetate, and 90 mmol of N-methylimidazole to a reaction flask equipped with a reflux condenser. Heat to 75 °C and stir for 96 h. After vacuum distillation, extract and wash the crude product with ethyl acetate, and dry to obtain the ionic liquid precursor; the structural formula is as follows: .

[0028] (2) Add 40 mL of acetonitrile, 25 mmol of ionic liquid precursor, 75 mmol of sodium tetrafluoroborate, and 30 mL of water to the reaction flask. Stir rapidly at 30 °C for 18 h. After vacuum distillation, extract and wash the product with dichloromethane, and dry to obtain a polyester-based ionic liquid with the following structural formula: .

[0029] (3) In an ice-water bath, add 40 mL of dichloromethane, 10 mmol of polyethylene glycol 1000, 20 mmol of triethylamine and 22 mmol of propionyl chloride to the flask, and then stir the reaction at 30 °C for 18 h. After filtration, the filtrate is extracted and washed with saturated sodium chloride solution. The organic phase is removed by vacuum distillation to remove low-boiling substances and dried to obtain the modified polyether polyol conductive agent.

[0030] (4) Nitrogen gas is introduced into the flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone are added. The mixture is prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate, 3g of polyester-based ionic liquid, 10g of modified polyether polyol conductive agent, and 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are added. After stirring and mixing, a photocurable electro-electro-electro-electro-electro-electro-electro-phosphine oxide is prepared. The mixture is then coated between the upper and lower PET release films and placed in a high-pressure mercury lamp box for curing for 180s. The mixture is then transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive is transferred to the other side of the metallized PET to obtain a photocurable electro-electro ...

[0031] Example 2: (1) Add 30 mL of acetonitrile, 30 mmol of trimethylolpropane chloroacetate and 99 mmol of N-methylimidazole to a reaction flask equipped with a reflux condenser. Heat to 85 °C and stir for 72 h. After vacuum distillation, the crude product is extracted and washed with ethyl acetate and dried to obtain the ionic liquid precursor.

[0032] (2) Add 40 mL of acetonitrile, 25 mmol of ionic liquid precursor, 82.5 mmol of potassium hexafluorophosphate, and 40 mL of water to the reaction flask. Stir rapidly at 20 °C for 24 h. After vacuum distillation, extract and wash the product with dichloromethane, and dry to obtain a polyester-based ionic liquid with the following structural formula: .

[0033] (3) In an ice-water bath, add 40 mL of dichloromethane, 10 mmol of polypropylene glycol 1200, 20 mmol of triethylamine and 22 mmol of n-butyryl chloride to the flask, and then stir the reaction at 25 °C for 24 h. After filtration, extract and wash the filtrate with saturated sodium chloride solution, remove low-boiling substances by vacuum distillation of the organic phase, and dry to obtain the modified polyether polyol conductive agent.

[0034] (4) Nitrogen gas is introduced into the flask, and 40g of butyl acrylate, 30g of isooctyl acrylate, 10g of acrylic acid, 10g of hydroxypropyl acrylate, 10g of methyl acrylate, and 0.08g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are added. The mixture is prepolymerized under a high-pressure mercury lamp for 20min. Then, 0.26g of crosslinking agent 1,6-hexanediol diacrylate, 8g of polyester-based ionic liquid, 20g of modified polyether polyol conductive agent, and 0.22g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are added. After stirring and mixing, a photocurable electro-electro-electro-peelable adhesive is prepared and coated between the upper and lower PET release films. The adhesive is then placed in a high-pressure mercury lamp box for 210s for curing. The adhesive is then transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive is transferred to the other side of the metallized PET to obtain a photocurable electro-electro-electro-peelable tape.

[0035] Example 3: (1) In an ice-water bath, add 30 mL of dichloromethane, 10 mmol of polypropylene glycol 1200, 21 mmol of triethylamine and 20 mmol of acetyl chloride to a flask, and then stir the reaction at 20 °C for 24 h. After filtration, extract and wash the filtrate with saturated sodium chloride solution, remove low-boiling substances by vacuum distillation of the organic phase, and dry to obtain modified polyether polyol conductive agent.

[0036] (2) Nitrogen gas was introduced into the flask, and 60g of isooctyl acrylate, 15g of acrylic acid, 10g of hydroxypropyl acrylate, 15g of methyl methacrylate, and 0.06g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 20min. Then, 0.12g of crosslinking agent 1,6-hexanediol diacrylate, 14g of polyester-based ionic liquid (prepared according to the method in Example 1), 30g of modified polyether polyol conductive agent, and 0.12g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were added. After stirring and mixing, a photocurable electro-electro-electro-electro-electro-electro-electro-phosphine oxide was prepared and coated between the upper PET release film and the lower PET release film. The mixture was placed in a high-pressure mercury lamp box for 150s of curing and then transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a photocurable electro-electro ...

[0037] Example 4 (1) In an ice-water bath, 40 mL of dichloromethane, 10 mmol of polyethylene glycol 1000, 20 mmol of triethylamine, and 24 mmol of valerate were added to a flask. The mixture was stirred and reacted at 25 °C for 24 h. After filtration, the filtrate was extracted and washed with saturated sodium chloride solution. The organic phase was distilled under reduced pressure to remove low-boiling substances and dried to obtain the modified polyether polyol conductive agent.

[0038] (2) Nitrogen gas was introduced into the flask, and 50g of butyl acrylate, 15g of isooctyl acrylate, 10g of acrylic acid, 15g of isobornyl acrylate, 10g of hydroxyethyl acrylate, and 0.05g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were added. The mixture was prepolymerized under a high-pressure mercury lamp for 12 min. Then, 0.2g of crosslinking agent ethoxylated trimethylolpropane triacrylate, 20g of polyester-based ionic liquid (prepared according to the method in Example 1), and 40g of modified polyether polyol conductive agent were added. 0.2g of photoinitiator 2-hydroxy-2-methyl-1-phenylpropanone was added. After stirring and mixing, a photocurable electro-electro ...

[0039] Comparative Example 1: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate and 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were added. After stirring and mixing, a light-curing adhesive was prepared and coated between the upper and lower PET release films. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a light-curing tape.

[0040] Comparative Example 2: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate and 10g of modified polyether polyol conductive agent (prepared according to the method of Example 1) were added. 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide was added. After stirring and mixing, a light-curing adhesive was prepared and coated between the upper PET release film and the lower PET release film. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a light-curing tape.

[0041] Comparative Example 3: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate and 3g of polyester-based ionic liquid (prepared according to the method of Example 1) were added. 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide was added. After stirring and mixing, a light-curing adhesive was prepared and coated between the upper PET release film and the lower PET release film. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a light-curing tape.

[0042] Comparative Example 4: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate, 3g of polyester-based ionic liquid (prepared according to the method of Example 1), 10g of polyethylene glycol 1000, and 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were added. After stirring and mixing, a photocurable electrolytic easy-to-peel adhesive was prepared and coated between the upper PET release film and the lower PET release film. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a photocurable tape.

[0043] Comparative Example 5: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate, 3g of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, 10g of modified polyether polyol conductive agent, and 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide were added. After stirring and mixing, a light-curing adhesive was prepared and coated between the upper PET release film and the lower PET release film. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a light-curing tape.

[0044] Comparative Example 6: (1) Nitrogen gas was introduced into a flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone were added. The mixture was prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate, 3g of 1-ethyl-3-methylimidazolium tetrafluoroborate, and 10g of modified polyether polyol conductive agent were added. 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide was added. After stirring and mixing, a light-curing adhesive was prepared and coated between the upper and lower PET release films. The adhesive was placed in a high-pressure mercury lamp box and cured for 180s. Then, it was transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive was transferred to the other side of the metallized PET to obtain a light-curing tape.

[0045] Comparative Example 7: (1) 20 mL of acetonitrile, 30 mmol of ethylene glycol dimonochloroacetate (CAS No. 6941-69-1), and 60 mmol of N-methylimidazole were added to a reaction flask equipped with a reflux condenser. The mixture was heated to 75 °C and stirred for 96 h. After vacuum distillation, the crude product was extracted and washed with ethyl acetate and dried to obtain an ionic liquid precursor with the following structural formula: .

[0046] (2) Add 40 mL of acetonitrile, 25 mmol of ionic liquid precursor, 50 mmol of sodium tetrafluoroborate, and 30 mL of water to the reaction flask. Stir rapidly at 30 °C for 18 h. After vacuum distillation, extract and wash the product with dichloromethane, and dry to obtain a polyester-based ionic liquid with the following structural formula: .

[0047] (3) In an ice-water bath, add 40 mL of dichloromethane, 10 mmol of polyethylene glycol 1000, 20 mmol of triethylamine and 22 mmol of propionyl chloride to the flask, and then stir the reaction at 30 °C for 18 h. After filtration, the filtrate is extracted and washed with saturated sodium chloride solution. The organic phase is removed by vacuum distillation to remove low-boiling substances and dried to obtain the modified polyether polyol conductive agent.

[0048] (4) Nitrogen gas is introduced into the flask, and 28g of butyl acrylate, 27g of isooctyl acrylate, 18g of acrylic acid, 16g of hydroxypropyl acrylate, 11g of methyl methacrylate, and 0.075g of photoinitiator 1-hydroxycyclohexylphenyl ketone are added. The mixture is prepolymerized under a high-pressure mercury lamp for 15min. Then, 0.2g of crosslinking agent 1,6-hexanediol diacrylate, 3g of polyester-based ionic liquid, 10g of modified polyether polyol conductive agent, and 0.2g of photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide are added. After stirring and mixing, a light-curing adhesive is prepared and coated between the upper and lower PET release films. The adhesive is then placed in a high-pressure mercury lamp box for 180s of curing. The adhesive is then transferred to the metal layer of the metallized PET. Ordinary acrylic pressure-sensitive adhesive is transferred to the other side of the metallized PET to obtain a light-curing tape.

[0049] The UV-cured adhesive portion of the tape is bonded to the substrate, and the 180° peel strength is tested according to the method of GB / T 2792-2014.

[0050] The UV-cured adhesive portion of the tape is bonded to the substrate, then a 9V voltage is applied to the tape for 20 seconds, and the 180° peel strength is tested.

[0051] The resistance to damp heat and the holding tack and sliding displacement were tested according to the method of GB / T 4851-2014. The temperature was 85℃, the relative humidity was 85%, the weight mass was 500g, and the time was 48h.

[0052] Table 1 Performance of the tape

[0053] Compared to Comparative Example 1, the acrylic resin photocurable adhesives of Examples 1-4 incorporated a polyester-based ionic liquid and a modified polyether polyol conductive agent. Both the ionic liquid and the modified polyether polyol contain multiple ester groups, exhibiting excellent compatibility with the acrylic resin matrix. Their addition to the acrylic resin adhesive has minimal impact on its bonding performance, maintaining good 180° peel strength and holding power. Furthermore, the ionic liquid contains multiple ionic salt groups, possessing more directionally movable charges. The modified polyether polyol conductive agent forms a continuous ionic pathway in the adhesive. Upon energization, under the drive of an electric field, the anions and cations of the ionic liquid undergo spontaneous combustion along the direction of the electric field within the ionic pathway formed by the modified polyether polyol conductive agent. Through movement and directional migration, an interfacial electrochemical reaction is formed. Ions that accumulate at the interface form a solvation layer between the adhesive molecular chains, causing local swelling of the adhesive surface. The volume expansion caused by the swelling creates internal stress at the interface, weakening the van der Waals forces and hydrogen bonds between the adhesive molecular chains and the substrate. This breaks the physical and chemical adhesion between the adhesive and the substrate, tearing the contact points between the adhesive and the substrate, thereby reducing the interfacial bond strength. Through the ion migration effect and the weakening effect of the interfacial interaction, the debonding speed and degree increase after energizing, significantly reducing the peel strength between the tape and the substrate. This achieves the effect of peeling off the tape without residue and with controllable and damage-free peeling under ultra-low voltage.

[0054] Compared with Example 1, Comparative Example 2 did not add ionic liquid, and the peel strength at 180° after applying voltage was still very high, making it difficult to achieve an easy peel effect.

[0055] Comparative Example 3, which did not contain a modified polyether polyol conductive agent, showed a significantly greater 180° peel strength after applying voltage than Example 1, indicating poor peelability.

[0056] Comparative Example 4 included polyethylene glycol 1000, which does not contain ester groups and has poor compatibility with acrylic resin, affecting the adhesive performance of the tape. The peel strength before energization decreased significantly. Furthermore, polyethylene glycol 1000 did not form a continuous ionic pathway in the adhesive matrix, which hindered the free movement and directional migration of ionic liquids after energization. The 180° peel strength after applying voltage was significantly greater than that of Example 1, indicating poor peelability.

[0057] The 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid and 1-ethyl-3-methylimidazolium tetrafluoroborate of Comparative Examples 5 and 6 do not contain ester groups, resulting in poor compatibility with acrylic resin. This affects the adhesive performance of the tape, and the peel strength before energization is lower than that of Example 1. Furthermore, the poor compatibility and dispersion are not conducive to the free movement and directional migration of the ionic liquid anions and cations. At the same time, the content of anions and cations is relatively low, and the peel strength at 180° after applying voltage is greater than that of Example 1, indicating poor peeling effect.

[0058] The ionic liquid of Comparative Example 7 had a lower content of ester groups and cations and anions than that of Example 1, and its 180° peel strength before and after energization was lower than that of Example 1.

[0059] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A photocurable easy-to-peel adhesive tape, characterized by, The tape consists of an upper release film, a photocurable electrolytic easy-peel adhesive layer, a metallized PET layer, a pressure-sensitive adhesive layer, and a lower release film; The photocurable electrolytic easy-peel adhesive layer comprises 100 parts by weight of vinyl monomer, 0.18-0.3 parts by weight of photoinitiator, 0.12-0.26 parts by weight of crosslinking agent, 3-20 parts by weight of polyester-based ionic liquid, and 10-40 parts by weight of modified polyether polyol conductive agent. The structural formula of the poly-ester-based ionic liquid is , the R group is , or .

2. The photocurable electrolytic easy-peel tape according to claim 1, characterized in that, The vinyl monomers include any one or more of acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, isobornyl acrylate, hydroxypropyl acrylate, or hydroxyethyl acrylate.

3. The photocurable electrolytic easy-peel tape according to claim 1, characterized in that, The photoinitiator is one or more of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenylpropanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

4. The photocurable electrolytic easy-peel tape according to claim 1, characterized in that, The crosslinking agent is one or more of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, and divinylbenzene.

5. The photocurable electrolytic easy-peel tape according to claim 1, characterized in that, The preparation method of the polyester-based ionic liquid is as follows: (1) Add acetonitrile, trimethylolpropane trichloroacetic acid in a molar ratio of 1:(3-3.3) and N-methylimidazole to a reaction flask equipped with a reflux condenser. Heat to 75-85℃ and stir for 72-96 h. After vacuum distillation, extract and wash the crude product and dry it to obtain the ionic liquid precursor. (2) Add acetonitrile, ionic liquid precursor with a molar ratio of 1:(3-3.3), inorganic salt and water to the reaction flask, stir the reaction at 20-30℃ for 18-24h, extract and wash the product after vacuum distillation, and dry it to obtain polyester-based ionic liquid.

6. The photocurable electrolytic easy-peel tape according to claim 5, characterized in that, The inorganic salt in (2) is sodium tetrafluoroborate, potassium hexafluorophosphate or lithium bis(trifluoromethanesulfonyl)imide.

7. The photocurable electrolytic easy-peel tape according to claim 1, characterized in that, The modified polyether polyol conductive agent is prepared as follows: In an ice-water bath, dichloromethane, polyether polyol with a molar ratio of 1:(2-2.1):(2-2.4), triethylamine, and acyl chloride are added to a flask. The mixture is then stirred and reacted at 20-30℃ for 18-24 hours. After filtration, the filtrate is extracted and washed with saturated sodium chloride solution. The organic phase is then distilled under reduced pressure to remove low-boiling substances and dried to obtain the modified polyether polyol conductive agent.

8. The photocurable electrolytic easy-peel tape according to claim 7, characterized in that, The polyether polyol is polyethylene glycol, polypropylene glycol, or polytetrahydrofuran ether diol.

9. The photocurable electrolytic easy-peel tape according to claim 7, characterized in that, The acyl chloride substances are acetyl chloride, propionyl chloride, n-butyryl chloride, isobutyryl chloride, valeryl chloride, isovaleryl chloride, and hexanoyl chloride.

10. A method for preparing a photocurable electrolytic easy-peel tape as described in any one of claims 1-9, characterized in that, The method for preparing the photocurable electro-electro-electro-electro-peelable tape includes: introducing nitrogen gas into a flask, adding vinyl monomers and photoinitiators, irradiating prepolymerization under a high-pressure mercury lamp for 12-20 minutes, then adding crosslinking agents, polyester-based ionic liquids, modified polyether polyol conductive agents, and photoinitiators, stirring and mixing to prepare a photocurable electro-electro ...

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