An electrically conductive adhesion-reducing easy-peel adhesive tape and a method for preparing the same

Abstract

The application belongs to the technical field of adhesive tapes, and particularly relates to an electrically conductive adhesion-reducing and easy-to-peel adhesive tape and a preparation method thereof. The preparation method of the electrically conductive adhesion-reducing and easy-to-peel adhesive tape comprises the following steps: S1, acrylic acid-acrylate copolymer, tetrahydrofuran acrylate, a thermal adhesion-reducing material, a photoinitiator and a leveling agent are added into a solvent and stirred uniformly to obtain a glue solution; S2, polyacrylonitrile is dissolved in N,N-dimethylformamide, then carbon nanotubes are added and stirred uniformly to obtain a spinning solution, the spinning solution is subjected to electrostatic spinning to obtain a fiber composite material, then the fiber composite material is subjected to pre-oxidation treatment and carbonization treatment in sequence to obtain an electrically conductive heating grid material; S3, the electrically conductive heating grid material is placed in the glue solution for sufficient impregnation, the electrically conductive heating grid material is taken out, dried and subjected to double-sided lamination of an anti-adhesion film, ultraviolet curing, cutting and shaping to obtain the electrically conductive adhesion-reducing and easy-to-peel adhesive tape. The adhesive tape can realize rapid electrically conductive adhesion reduction and has good peeling performance.

Description

Technical Field

[0001] This invention belongs to the field of adhesive tape technology, specifically relating to an electrically conductive, non-adhesive, and easily peelable adhesive tape and its preparation method. Background Technology

[0002] Adhesives are substances that bond two substrates together using interfacial adhesion and molecular cohesion, primarily serving functions such as connection, fixation, and sealing. For permanent bonding, the adhesive must bond strongly enough to meet usage requirements, directly determining the product's medium- to long-term performance. However, in reality, most bonding scenarios are non-permanent. This is because many bonding scenarios require frequent disassembly or repair to achieve the rational reuse of bonded components, such as batteries in new energy vehicles, smartphone screens, and temporary bonding during wafer thinning. This necessitates that the adhesive possess excellent bonding strength throughout its lifespan, while also being able to peel off as needed when the product requires disassembly or repair. Bonding is the result of contact and interaction between interfaces of different materials. Bonding theories include adsorption theory, electrostatic theory, and mechanical interlocking theory. To achieve on-demand peeling of the bonding system, two approaches can be taken: first, damaging the intrinsic strength of the adhesive; and second, disrupting the interfacial interaction between the adhesive and the bonded substrate.

[0003] Electricity-activated anti-adhesion tape is a smart material that achieves adhesion regulation through current triggering. It is mainly used in scenarios that require temporary fixation and subsequent non-destructive disassembly. Its core principle is that the tape's adhesion is significantly reduced after being energized, thus achieving easy peeling. Electricity-activated anti-adhesion tape has the following characteristics: (1) Strong adhesion: In the unenergized state, the tape has good initial adhesion and bonding force, and can adhere firmly to the circuit board. (2) Quick peeling: After being energized, one side of the tape is slightly adhered and can be easily peeled off from the adhered object, making it suitable for temporary fixation of electronic devices. (3) It can be widely used in the fields of electronics, automobiles, and medical care, especially in the installation process of mobile phone batteries, where it is convenient to disassemble.

[0004] Therefore, there is an urgent need for an electrically conductive, non-sticky, and easily peelable tape that, through component design, can disrupt the interfacial interaction between the tape and the adhesive substrate, achieving rapid electrical non-sticking and obtaining good peel performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an electrically conductive, non-adhesive, and easily peelable tape and its preparation method. The invention uses acrylic acid-acrylate copolymer, tetrahydrofuran acrylate, and thermally reducing adhesive materials to prepare an adhesive solution. An electrothermal mesh material is prepared using polyacrylonitrile and carbon nanotubes as raw materials through electrospinning and carbonization. Finally, an impregnation process is used to composite the adhesive solution and the electrothermal mesh material, resulting in an electrically conductive, non-adhesive, and easily peelable tape. When energized, the electrothermal mesh material achieves efficient and uniform heating, causing structural shrinkage of the thermally reducing adhesive material. This reduces the effective contact area between the tape and the adhered material, thereby achieving efficient electrically conductive non-adhesive bonding and effectively preventing adhesive residue.

[0006] A first aspect of the present invention provides a method for preparing an electrically conductive, non-adhesive, and easily peelable adhesive tape, comprising the following steps:

[0007] S1. By weight, add 40-50 parts of acrylic-acrylate copolymer, 30-40 parts of tetrahydrofuran acrylate, 10-20 parts of heat-reducing material, 1-2 parts of photoinitiator and 0.2-0.4 parts of leveling agent to 40-50 parts of solvent and stir evenly to obtain adhesive solution;

[0008] S2. Dissolve 16-20 parts of polyacrylonitrile in 90-100 parts of N,N-dimethylformamide, then add 6-10 parts of carbon nanotubes and stir evenly to obtain a spinning solution. Electrospin the spinning solution to obtain a fiber composite material, and then perform pre-oxidation treatment and carbonization treatment in sequence to obtain an electrothermal mesh material.

[0009] S3. The electric heating grid material is fully immersed in the adhesive solution. After immersion, it is removed and dried. An anti-stick film is then applied to both sides, cured under ultraviolet light, and cut into shape to obtain an electric-conducting, non-stick, and easy-to-peel tape.

[0010] As a preferred embodiment of the present invention, the weight parts of the acrylic-acrylate copolymer may be 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, or 50 parts, etc.

[0011] As a preferred embodiment of the present invention, the tetrahydrofuran acrylate may be in the following weight proportions: 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, or 40 parts, etc.

[0012] As a preferred embodiment of the present invention, the weight parts of the heat-reducing adhesive material may be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, or 20 parts, etc.

[0013] As a preferred embodiment of the present invention, the photoinitiator may be present in weight parts of 1.0, 1.2, 1.4, 1.6, 1.8, or 2.0 parts, etc.

[0014] As a preferred embodiment of the present invention, the weight parts of the leveling agent may be 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, or 0.4 parts, etc.

[0015] As a preferred embodiment of the present invention, the weight parts of the polyacrylonitrile may be 16 parts, 17 parts, 18 parts, 19 parts or 20 parts, etc.

[0016] As a preferred embodiment of the present invention, the carbon nanotubes may be in the following weight proportions: 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts.

[0017] As a preferred technical solution of the present invention, the preparation method of the heat-reducing material is as follows: product A is prepared by using methyl paraben and 6-chloro-1-hexanol as raw materials, product A is subjected to alkali treatment to obtain product B, product C is prepared by using product B and acryloyl chloride as raw materials, and the heat-reducing material is obtained by using product C and 2,6-di-tert-butyl-p-cresol as raw materials through a substitution reaction.

[0018] The thermally de-adhesive material of this invention belongs to thermotropic liquid crystal materials. Due to the presence of an electrically heated mesh material, the temperature of the tape will increase during the energization process. The thermotropic liquid crystal material changes from a crystalline state to a liquid crystal state, thus obtaining good fluidity. The orderliness of the molecular chain segments changes, and the material will shrink to a certain extent on a macroscopic scale, thereby reducing the effective contact area between the tape and the attached material, thereby achieving efficient energized de-adhesive.

[0019] As a preferred technical solution of the present invention, the preparation steps of product A are as follows: by weight, 60-70 parts of methylparaben and 70-80 parts of 6-chloro-1-hexanol are added to 280-300 parts of N,N-dimethylformamide and stirred to dissolve. Then, 60-70 parts of potassium carbonate are added, the temperature is raised to 80-90°C and stirred for 20-24 hours. The mixture is washed with deionized water, rotary evaporated, and vacuum dried to obtain product A.

[0020] As a preferred technical solution of the present invention, the preparation steps of product B, by weight, are as follows: 20-30 parts of sodium hydroxide and 60-70 parts of methanol are added to 80-100 parts of deionized water and mixed well, then 80-90 parts of product A are added and treated with alkali at 70-80°C for 4-6 hours, extracted with toluene, the pH of the aqueous phase is adjusted to 1-2 to precipitate a white precipitate, filtered, and dried under vacuum to obtain product B.

[0021] As a preferred technical solution of the present invention, the preparation steps of product C are as follows: by weight, 60-70 parts of product B are dissolved in 180-200 parts of N-methylpyrrolidone, 20-30 parts of acryloyl chloride are added and stirred for 6-8 hours under the condition of 0-4°C, filtered and recrystallized, filtered, and vacuum dried to obtain product C.

[0022] As a preferred technical solution of the present invention, the substitution reaction step is as follows: by weight, 14-16 parts of the product C, 7-8 parts of 2,6-di-tert-butyl-p-cresol and 12-14 parts of N,N'-dicyclohexylcarbodiimide are added to 200-240 parts of dichloromethane and stirred evenly. Then, 1-2 parts of 4-dimethylaminopyridine are added and the substitution reaction is carried out at room temperature for 20-24 hours. The insoluble matter is removed by filtration, washed with saturated sodium chloride solution, rotary evaporated and dried to obtain the heat-reducing material.

[0023] As a preferred embodiment of the present invention, the conditions for electrospinning are: a spinning distance of 18-20 cm, a spinning voltage of 12-16 kV, and a spinning speed of 0.6-1.0 mL / h.

[0024] As a preferred technical solution of the present invention, the pre-oxidation treatment conditions are as follows: heating from room temperature to 240~260℃ at 4℃ / min and holding for 50~60min, then heating to 270~275℃ at 1℃ / min and holding for 50~60min, and finally heating to 280~285℃ at 1℃ / min and holding for 100~120min;

[0025] The carbonization treatment conditions are as follows: under a nitrogen atmosphere, first maintain at 700~800℃ for 20~30 min, then maintain at 900~1000℃ for 20~30 min, and then cool to room temperature.

[0026] This invention uses polyacrylonitrile and carbon nanotubes as raw materials to prepare spinning solution, obtains polyacrylonitrile nanofibers loaded with carbon nanotubes through electrospinning technology, and then converts the polyacrylonitrile fibers into carbon nanofibers through pre-oxidation and carbonization treatment. Combined with the embedding of carbon nanotubes, an electrothermal grid material is obtained.

[0027] As a preferred embodiment of the present invention, the photoinitiator is selected from diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide or ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

[0028] As a preferred embodiment of the present invention, the leveling agent is selected from one or more of BYK333, BYK306 or BYK307.

[0029] As a preferred embodiment of the present invention, the solvent is selected from one or more of ethyl acetate, dichloromethane, or trichloromethane.

[0030] As a preferred embodiment of the present invention, the ultraviolet curing conditions are as follows: curing is performed using a conveyor-type ultraviolet curing machine equipped with 405nm wavelength LED lamps, the curing speed is 0.4~0.6m / min, and the curing light intensity is 180~200mW / cm². 2 .

[0031] A second aspect of the present invention provides an electrically conductive, non-adhesive, and easily peelable adhesive tape prepared by the preparation method described in the first aspect.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The present invention uses acrylic acid-acrylate copolymer, tetrahydrofuran acrylate, heat-reducing adhesive and other raw materials to prepare adhesive liquid, and uses polyacrylonitrile and carbon nanotubes as raw materials to prepare electrothermal grid material through electrospinning and carbonization treatment. Finally, the adhesive liquid and electrothermal grid material are composited through impregnation process to obtain an electric-cooled and easy-to-peel tape. When energized, the electrothermal grid material can achieve efficient and uniform heating, causing the heat-reducing adhesive material to shrink in structure, which reduces the effective contact area between the tape and the attached object, thereby achieving efficient electric-cooled adhesive and effectively avoiding the appearance of residual adhesive.

[0034] (2) The thermal de-adhesion material of the present invention belongs to the thermotropic liquid crystal material. Due to the presence of an electrothermal grid material, the temperature of the tape will increase during the energization process. The thermotropic liquid crystal material changes from a crystalline state to a liquid crystal state and obtains good fluidity. The orderliness of the molecular chain segments changes, and the material will shrink to a certain extent on a macroscopic scale, which reduces the effective contact area between the tape and the attached material, thereby achieving efficient energization de-adhesion.

[0035] (3) The electrothermal grid material of the present invention constructs a three-dimensional conductive network with good electron transfer performance through a carbon nanofiber matrix. Carbon nanotubes are embedded in carbon nanofibers, and clusters and wrinkles appear on the surface of carbon nanofibers. This will ensure the transmission of electrons at high speed, thereby achieving efficient and uniform heating under energized conditions. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart illustrating the preparation process of the thermally de-sticking material in Embodiment 1 of the present invention.

[0038] Figure 2 This is a SEM image of the electrothermal grid material in Embodiment 1 of the present invention. Detailed Implementation

[0039] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0040] The sources of some components in the examples and comparative examples are as follows:

[0041] Acrylic acid-acrylate copolymer, CAS No. 25133-97-5, purchased from Hubei Chenghai Chemical Co., Ltd.

[0042] Tetrahydrofuran acrylate, CAS No. 2399-48-6, was purchased from Nantong Zhonghe Chemical New Materials Co., Ltd.

[0043] Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, CAS No. 75980-60-8, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0044] 2,4,6-Trimethylbenzoylphenylphosphonic acid ethyl ester, CAS No. 84434-11-7, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0045] Leveling agents BYK333, BYK306, and BYK307 were purchased from BYK Chemical.

[0046] Methylparaben, CAS No. 99-76-3, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0047] 6-Chloro-1-hexanol, CAS No. 2009-83-8, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0048] Acryloyl chloride, CAS No. 814-68-6, was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0049] 2,6-Di-tert-butyl-p-cresol, CAS No. 128-37-0, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0050] N,N'-Dicyclohexylcarbodiimide (DCC), CAS No. 538-75-0, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0051] 4-Dimethylaminopyridine (DMAP), CAS No. 1122-58-3, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0052] Polyacrylonitrile, CAS No. 25014-41-9, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0053] Carbon nanotubes, item number C313046, were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0054] Example 1

[0055] This embodiment provides a method for preparing an electrically conductive, non-adhesive, and easily peelable adhesive tape, comprising the following steps:

[0056] S1. By weight, 50 parts of acrylic-acrylate copolymer, 40 parts of tetrahydrofuran acrylate, 20 parts of heat-resistant tack reducer, 2 parts of photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and 0.4 parts of leveling agent BYK333 are added to 50 parts of solvent ethyl acetate and stirred evenly to obtain the adhesive solution.

[0057] S2. Dissolve 20 parts of polyacrylonitrile in 100 parts of N,N-dimethylformamide, then add 10 parts of carbon nanotubes and stir evenly to obtain a spinning solution. Perform electrospinning on the spinning solution (spinning distance 20cm, spinning voltage 16kV, spinning speed 1.0mL / h) to obtain a fiber composite material. Then, perform a pre-oxidation treatment by heating from room temperature to 260℃ at 4℃ / min and holding for 50min, then heating to 275℃ at 1℃ / min and holding for 50min, and finally heating to 285℃ at 1℃ / min and holding for 100min. Then, perform a carbonization treatment by placing it in a nitrogen atmosphere, first holding it at 800℃ for 20min, then holding it at 1000℃ for 20min, and cooling it to room temperature to obtain an electrothermal mesh material.

[0058] S3. Immerse the electrothermal grid material in the adhesive solution until fully impregnated. After impregnation, remove and dry it, then apply an anti-stick film to both sides. Curing is performed using a tracked UV curing machine equipped with 405nm wavelength LEDs at a curing speed of 0.6m / min and a curing light intensity of 200mW / cm². 2 Cut and shape to obtain an electrically conductive, non-sticky, and easily peelable tape.

[0059] The heat-reducing and anti-sticking material was prepared as follows: 70 parts by weight of methylparaben and 80 parts by weight of 6-chloro-1-hexanol were added to 300 parts by weight of N,N-dimethylformamide and stirred until dissolved. Then, 70 parts by weight of potassium carbonate were added, and the mixture was heated to 90°C and stirred for 20 hours. The mixture was washed with deionized water, rotary evaporated, and vacuum dried to obtain product A. 30 parts by weight of sodium hydroxide and 70 parts by weight of methanol were added to 100 parts by weight of deionized water and mixed well. Then, 90 parts by weight of product A were added and the mixture was treated with alkali at 80°C for 4 hours. The mixture was extracted with toluene, and the pH of the aqueous phase was adjusted to 2 to precipitate a white precipitate. The precipitate was filtered and vacuum dried. Product B was obtained; 70 parts of product B were dissolved in 200 parts of N-methylpyrrolidone, and 30 parts of acryloyl chloride were added and stirred for 8 hours at 4°C. After filtration, recrystallization was performed, followed by filtration and vacuum drying to obtain product C; 16 parts of product C, 8 parts of 2,6-di-tert-butyl-p-cresol, and 14 parts of N,N'-dicyclohexylcarbodiimide were added to 240 parts of dichloromethane and stirred until homogeneous. Then, 2 parts of 4-dimethylaminopyridine were added and a substitution reaction was carried out at room temperature for 24 hours. The insoluble matter was removed by filtration, and the product was washed with saturated sodium chloride solution, rotary evaporated, and dried to obtain the heat-reducing material.

[0060] Example 2

[0061] This embodiment provides a method for preparing an electrically conductive, non-adhesive, and easily peelable adhesive tape, comprising the following steps:

[0062] S1. By weight, 40 parts of acrylic-acrylate copolymer, 30 parts of tetrahydrofuran acrylate, 10 parts of heat-resistant tack reducer, 1 part of photoinitiator ethyl 2,4,6-trimethylbenzoylphenylphosphonate and 0.2 parts of leveling agent BYK306 are added to 40 parts of solvent dichloromethane and stirred evenly to obtain the adhesive solution.

[0063] S2. Dissolve 16 parts of polyacrylonitrile in 90 parts of N,N-dimethylformamide, then add 6 parts of carbon nanotubes and stir evenly to obtain a spinning solution. Perform electrospinning on the spinning solution (spinning distance 18cm, spinning voltage 12kV, spinning speed 0.6mL / h) to obtain a fiber composite material. Then, perform a pre-oxidation treatment by heating from room temperature to 240℃ at 4℃ / min and holding for 60min, then heating to 270℃ at 1℃ / min and holding for 60min, and finally heating to 280℃ at 1℃ / min and holding for 120min. Then, perform a carbonization treatment by placing it in a nitrogen atmosphere, first holding it at 700℃ for 30min, then holding it at 900℃ for 30min, and cooling it to room temperature to obtain an electrothermal mesh material.

[0064] S3. Immerse the electrothermal grid material in the adhesive solution until fully impregnated. After impregnation, remove and dry it, then apply an anti-stick film to both sides. Cur the material using a tracked UV curing machine equipped with 405nm wavelength LEDs at a curing speed of 0.4m / min and a curing light intensity of 180mW / cm². 2 Cut and shape to obtain an electrically conductive, non-sticky, and easily peelable tape.

[0065] The heat-reducing and anti-sticking material is prepared as follows: 60 parts by weight of methylparaben and 70 parts by weight of 6-chloro-1-hexanol are added to 280 parts by weight of N,N-dimethylformamide and stirred until dissolved. Then, 60 parts by weight of potassium carbonate are added, and the mixture is heated to 80°C and stirred for 24 hours. The mixture is washed with deionized water, rotary evaporated, and vacuum dried to obtain product A. 20 parts by weight of sodium hydroxide and 60 parts by weight of methanol are added to 80 parts by weight of deionized water and mixed. Then, 80 parts by weight of product A are added and the mixture is alkali-treated at 70°C for 6 hours. The mixture is extracted with toluene, and the pH of the aqueous phase is adjusted to 1 to precipitate a white precipitate. The precipitate is filtered and vacuum dried to obtain... To obtain product B; 60 parts of product B were dissolved in 180 parts of N-methylpyrrolidone, and 20 parts of acryloyl chloride were added at 0°C and stirred for 6 hours. After filtration, recrystallization was performed, followed by filtration and vacuum drying to obtain product C; 14 parts of product C, 7 parts of 2,6-di-tert-butyl-p-cresol, and 12 parts of N,N'-dicyclohexylcarbodiimide were added to 200 parts of dichloromethane and stirred until homogeneous. Then, 1 part of 4-dimethylaminopyridine was added and a substitution reaction was carried out at room temperature for 20 hours. The insoluble matter was removed by filtration, and the product was washed with saturated sodium chloride solution, rotary evaporated, and dried to obtain the heat-reducing material.

[0066] Example 3

[0067] This embodiment provides a method for preparing an electrically conductive, non-adhesive, and easily peelable adhesive tape, comprising the following steps:

[0068] S1. By weight, 45 parts of acrylic-acrylate copolymer, 35 parts of tetrahydrofuran acrylate, 15 parts of heat-resistant tack reducer, 1.5 parts of photoinitiator diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and 0.3 parts of leveling agent BYK307 are added to 45 parts of solvent trichloromethane and stirred evenly to obtain the adhesive solution.

[0069] S2. Dissolve 18 parts of polyacrylonitrile in 95 parts of N,N-dimethylformamide, then add 8 parts of carbon nanotubes and stir evenly to obtain a spinning solution. Perform electrospinning on the spinning solution (spinning distance 19 cm, spinning voltage 14 kV, spinning speed 0.8 mL / h) to obtain a fiber composite material. Then, perform a pre-oxidation treatment by heating from room temperature to 250℃ at 4℃ / min and holding for 55 min, then heating to 272℃ at 1℃ / min and holding for 55 min, and finally heating to 282℃ at 1℃ / min and holding for 110 min. Then, perform a carbonization treatment by placing it in a nitrogen atmosphere, first holding it at 750℃ for 25 min, then holding it at 950℃ for 25 min, and cooling it to room temperature to obtain an electrothermal mesh material.

[0070] S3. Immerse the electric heating mesh material in the adhesive solution until fully impregnated. After impregnation, remove and dry it, then apply an anti-stick film to both sides. Curing is performed using a tracked UV curing machine equipped with 405nm wavelength LEDs at a curing speed of 0.5m / min and a curing light intensity of 190mW / cm². 2 Cut and shape to obtain an electrically conductive, non-sticky, and easily peelable tape.

[0071] The heat-reducing and anti-sticking material was prepared as follows: 65 parts by weight of methylparaben and 75 parts by weight of 6-chloro-1-hexanol were added to 290 parts by weight of N,N-dimethylformamide and stirred until dissolved. Then, 65 parts by weight of potassium carbonate were added, and the mixture was heated to 85°C and stirred for 22 hours. The mixture was washed with deionized water, rotary evaporated, and vacuum dried to obtain product A. 25 parts by weight of sodium hydroxide and 65 parts by weight of methanol were added to 90 parts by weight of deionized water and mixed thoroughly. Then, 85 parts by weight of product A were added and the mixture was alkali-treated at 75°C for 5 hours. The mixture was extracted with toluene, and the pH of the aqueous phase was adjusted to 1.5 to precipitate a white precipitate. The precipitate was filtered and vacuum dried to obtain... Product B: 65 parts of product B were dissolved in 190 parts of N-methylpyrrolidone. 25 parts of acryloyl chloride were added and stirred for 7 hours at 2°C. After filtration, recrystallization was performed, followed by filtration and vacuum drying to obtain product C. 15 parts of product C, 7.5 parts of 2,6-di-tert-butyl-p-cresol, and 13 parts of N,N'-dicyclohexylcarbodiimide were added to 220 parts of dichloromethane and stirred until homogeneous. Then, 1.5 parts of 4-dimethylaminopyridine were added and a substitution reaction was carried out at room temperature for 22 hours. Insoluble matter was removed by filtration, and the mixture was washed with saturated sodium chloride solution, rotary evaporated, and dried to obtain a heat-reducing material.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 1 is that no heat-reducing tack material is added to the adhesive.

[0074] Comparative Example 2

[0075] The difference between this comparative example and Example 1 is that the adhesive is directly coated and molded without using an electrically heated grid material to impregnate the adhesive.

[0076] The performance of the tapes provided in the above embodiments and comparative examples was tested. The tapes were cut into strips with a length of 300 mm, a width of 25 mm, and a thickness of 50 μm. One side of the tape was attached to the electric vehicle battery pack, and the other side was fixed to the metal to obtain the test sample. The peel force of the tapes before and after being energized (voltage of 30 V, time of 30 s) was tested on the test sample. The peel force test speed was 300 mm / min, and it was observed whether there was any adhesive residue on the surface after peeling.

[0077] The performance test data above are shown in Table 1.

[0078] Table 1 Performance Test Results

[0079] Peeling force before energization (g / 25mm) Peeling force after energization (g / 25mm) Residual adhesive after power-on Example 1 2932 14 No residue Example 2 2915 11 No residue Example 3 2924 12 No residue Comparative Example 1 2861 1548 There is residual glue Comparative Example 2 2887 2391 There is residual glue

[0080] As can be seen from the above, the present invention prepares an adhesive liquid from raw materials such as acrylic acid-acrylate copolymer, tetrahydrofuran acrylate, and heat-reducing adhesive, and prepares an electrothermal grid material from polyacrylonitrile and carbon nanotubes through electrospinning and carbonization treatment. Finally, the adhesive liquid and the electrothermal grid material are combined through an impregnation process to obtain an electrically conductive, non-adhesive, and easy-to-peel tape (Examples 1 to 3).

[0081] Compared with Example 1, no heat-reducing material was added to the adhesive, and the lack of the heat-reducing material resulted in poor adhesion reduction effect of the tape when energized, and residual adhesive appeared (Comparative Example 1); compared with Example 1, the adhesive was directly coated and molded without using an electric heating grid material to impregnate the adhesive, and the lack of the electric heating grid material resulted in poor adhesion reduction effect when energized, and residual adhesive appeared (Comparative Example 2).

Claims

1. A method for preparing an electrically conductive tack-reducing and easily peelable adhesive tape, characterized in that, comprising the following steps: S1, adding 40-50 parts of acrylic-acrylate copolymer, 30-40 parts of tetrahydrofuran acrylate, 10-20 parts of thermal tack-reducing material, 1-2 parts of photoinitiator and 0.2-0.4 parts of leveling agent into 40-50 parts of solvent to stir uniformly to obtain a glue solution; S2, dissolving 16-20 parts of polyacrylonitrile in 90-100 parts of N, N-dimethylformamide, then adding 6-10 parts of carbon nanotubes to stir uniformly to obtain a spinning solution, electrospinning the spinning solution to obtain a fiber composite material, then sequentially performing pre-oxidation treatment and carbonization treatment to obtain an electric heating grid material; S3, placing the electric heating grid material in the glue solution for sufficient impregnation, taking out and drying after impregnation, and then laminating an anti-adhesive film on both sides, ultraviolet curing, cutting and forming to obtain the electrically conductive tack-reducing and easily peelable adhesive tape; and the preparation method of the thermal tack-reducing material is as follows: taking methyl p-hydroxybenzoate and 6-chloro-1-hexanol as raw materials to prepare product A, performing alkali treatment on the product A to obtain product B, taking the product B and acryloyl chloride as raw materials to prepare product C, and taking the product C and 2, 6-di-tert-butyl-p-cresol as raw materials to obtain the thermal tack-reducing material through a substitution reaction. 2.The method for preparing an electrically conductive tack-reducing and easily peelable adhesive tape according to claim 1, characterized in that, the preparation steps of the product A are as follows: taking 60-70 parts of methyl p-hydroxybenzoate and 70-80 parts of 6-chloro-1-hexanol as raw materials, adding them into 280-300 parts of N, N-dimethylformamide to stir and dissolve, then adding 60-70 parts of potassium carbonate, stirring at 80-90 ℃ for 20-24 h, washing with deionized water, rotary evaporation, and vacuum drying to obtain the product A. 3.The method for preparing an electrically conductive tack-reducing and easily peelable adhesive tape according to claim 1, characterized in that, the preparation steps of the product B are as follows: taking 20-30 parts of sodium hydroxide and 60-70 parts of methanol, adding them into 80-100 parts of deionized water to mix uniformly, then adding 80-90 parts of the product A to perform alkali treatment at 70-80 ℃ for 4-6 h, extracting with toluene, adjusting the pH of the aqueous phase to 1-2 to precipitate white precipitate, suction filtration, and vacuum drying to obtain the product B. 4.The method for preparing an electrically conductive tack-reducing and easily peelable adhesive tape according to claim 1, characterized in that, the preparation steps of the product C are as follows: taking 60-70 parts of product B, dissolving it in 180-200 parts of N-methyl pyrrolidone, adding 20-30 parts of acryloyl chloride at 0-4 ℃ to stir for 6-8 h, performing recrystallization after suction filtration, filtering, and vacuum drying to obtain the product C. 5.The method for preparing an electrically conductive tack-reducing and easily peelable adhesive tape according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ The substitution reaction is carried out by adding 14-16 parts of the product C, 7-8 parts of 2,6-di-tert-butyl-p-cresol and 12-14 parts of N,N'-dicyclohexyl carbodiimide into 200-240 parts of dichloromethane, stirring until uniform, then adding 1-2 parts of 4-dimethylamino pyridine, and carrying out the substitution reaction at room temperature for 20-24 hours. The insoluble matter is removed by suction filtration, washed with saturated sodium chloride solution, rotary evaporated, dried, and the heat-thinned material is obtained.

6. The preparation method of the power-on thinned and peeled adhesive tape according to claim 1, characterized in that, The pre-oxidation treatment is carried out by heating at 4 ℃ / min from room temperature to 240-260 ℃ and keeping for 50-60 min, then heating at 1 ℃ / min to 270-275 ℃ and keeping for 50-60 min, and finally heating at 1 ℃ / min to 280-285 ℃ and keeping for 100-120 min. The carbonization treatment is carried out by placing in a nitrogen atmosphere, first keeping at 700-800 ℃ for 20-30 min, then keeping at 900-1000 ℃ for 20-30 min, and cooling to room temperature.

7. The preparation method of the power-on thinned and peeled adhesive tape according to claim 1, characterized in that, The photoinitiator is selected from diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide or 2,4,6-trimethylbenzoyl phenyl phosphonic acid ethyl ester.

8. The preparation method of the power-on thinned and peeled adhesive tape according to claim 1, characterized in that, The conditions for the UV curing are: using a track UV curing machine equipped with 405 nm wavelength LED lamp for curing, the curing speed is 0.4-0.6 m / min, and the curing light intensity is 180-200 mW / cm 2 .

9. A power-on thinned and peeled adhesive tape, characterized in that, Prepared according to the preparation method of any one of claims 1-8.

Images