Multilayer composite tape and preparation method thereof

Abstract

The present invention discloses a multi-layer composite tape and a preparation method thereof, belonging to the technical field of new materials for adhesive tapes. The multi-layer composite tape is composed of a base film layer, a lower adhesive layer, a middle base film layer, an upper adhesive layer and a release film layer; the lower adhesive layer is solidified by a modified adhesive, and the modified adhesive preparation step is as follows: 50-60 parts of polyester resin, 30-40 parts of epoxy resin, 10-15 parts of auxiliary agent and 20-30 parts of solvent are fully stirred by weight, 5-15 parts of curing agent are added, stirred and filtered. The auxiliary agent contains calcium carbonate, an organic anti-aging structure and an inorganic anti-aging component, organic flame retardant elements nitrogen, silicon and inorganic flame retardant components, and there is a chemical reaction between the auxiliary agent and the epoxy resin and curing agent, so that the auxiliary agent can stably play its role, and then the modified adhesive and tape of the present invention have excellent anti-aging and flame retardancy.

Description

Technical Field

[0001] The present invention belongs to the technical field of new adhesive tape materials, and in particular relates to a multi-layer composite adhesive tape and a preparation method thereof. Background Art

[0002] Adhesive tape, also known as adhesive strips, adhesive tape, and adhesive paper, is a strip-shaped, adhesive artifact that can be attached to surfaces. It can be used to connect two dissimilar items or provide protective barriers. Adhesive tape consists of a backing material and an adhesive, or a backing material, adhesive, and release film, and is used to connect two or more unconnected objects.

[0003] However, the adhesive in the tape will undergo an oxidation reaction with oxygen when exposed to air for a long time, causing changes in the molecular structure and a decrease in viscosity. Ultraviolet rays will also destroy the molecular structure of the adhesive, causing aging and degradation, a decrease in viscosity or even loss of viscosity, which in turn affects its use. In the prior art, in order to ensure that the tape maintains its original viscosity and physical properties during long-term use and to avoid problems such as performance degradation, discoloration, and cracking, antioxidants or antioxidants are usually simply physically mixed with the other raw materials in the adhesive to achieve an anti-aging effect. However, since there is no interaction between the antioxidants or antioxidants and the other raw materials, as the use time increases, the antioxidants or antioxidants will gradually migrate or even come out, thereby losing the anti-aging effect. Therefore, it is urgent to design a multi-layer composite tape with excellent and stable anti-aging effect. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a multi-layer composite adhesive tape and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A multi-layer composite adhesive tape consists of a base film layer, a lower adhesive layer, a middle base film layer, an upper adhesive layer and a release film layer.

[0007] Furthermore, the material of the bottom base film layer and the middle base film layer is one or more of polyethylene terephthalate film, polyimide film, polyethylene naphthalate film, polypropylene film, and polyethylene film.

[0008] Furthermore, the thickness of the bottom base film layer and the middle base film layer is 20-50 μm.

[0009] Furthermore, the lower bonding layer is formed by curing a modified adhesive and has a thickness of 20-25 μm.

[0010] Furthermore, the modified adhesive is prepared by the following steps:

[0011] Fully stir 50-60 parts of polyester resin, 30-40 parts of epoxy resin, 10-15 parts of additives and 20-30 parts of solvent by weight, finally add 5-15 parts of curing agent, fully stir and filter to obtain the modified adhesive.

[0012] Furthermore, the polyester resin is one or both of polyethylene terephthalate and polybutylene terephthalate.

[0013] Furthermore, the epoxy resin is bisphenol A epoxy resin.

[0014] Furthermore, the auxiliary agent is prepared by the following steps:

[0015] S1. Blow nitrogen through a dry three-necked flask for 30 minutes to expel air and moisture from the flask. Then, add 3,5-di-tert-butyl-4-hydroxybenzoic acid, EDC (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride), NHS (N-hydroxysuccinimide), and chloroform. After stirring to dissolve, slowly add 2,2,6,6-tetramethylpiperidinamine. Then, raise the temperature to 65°C and keep the temperature to react for 6.5 hours. After the reaction, cool to room temperature, evaporate under reduced pressure, and purify by column chromatography (a mixed solvent of chloroform and diethyl ether is selected as the eluent, and the volume ratio of chloroform to diethyl ether is 9:1). Then, evaporate under reduced pressure to obtain intermediate 1. The usage ratio of 3,5-di-tert-butyl-4-hydroxycinnamic acid, 2,2,6,6-tetramethylpiperidinamine, EDC, NHS, and chloroform is 25 g:20 mL:0.6 g:0.4 g:200 mL.

[0016] Under the action of EDC and NHS, the molar ratio of 3,5-di-tert-butyl-4-hydroxycinnamic acid to 2,2,6,6-tetramethylpiperidinamine is controlled to be 1:1.1-1.2, and the -COOH of 3,5-di-tert-butyl-4-hydroxycinnamic acid and the -NH2 of 2,2,6,6-tetramethylpiperidinamine undergo amidation reaction. The reaction equation is as follows:

[0017]

[0018] S2, nitrogen blast dry three-necked flask for 30min to expel air and moisture in the bottle, then add intermediate 1, triethylamine and chloroform, stir to dissolve, then slowly add cyanuric chloride, after addition is complete, stir and react at room temperature for 3h, after completion of the reaction, first cool to room temperature, then distill under reduced pressure, column chromatography purification (eluent selects a mixed solvent of benzene and ether, the volume ratio of benzene and ether is 6:4), finally distill under reduced pressure to obtain intermediate 2; the amount ratio of intermediate 1, cyanuric chloride, triethylamine and chloroform is 27g:13.8g:11.7mL:240mL;

[0019] Triethylamine is used as an acid-binding agent to control the molar ratio of intermediate 1 to cyanuric chloride to be 1:1.05-1.1. The -NH- of intermediate 1 undergoes a substitution reaction with the -Cl of cyanuric chloride. The reaction process is as follows:

[0020]

[0021] S3. Purify a dry brown three-necked flask with nitrogen for 30 minutes to expel air and moisture from the flask, then add resorcinol, anhydrous aluminum chloride, and dimethyl sulfoxide. After stirring, slowly add intermediate 2, then heat to 115°C with stirring, and react at 115°C for 12 hours. After the reaction, slowly pour the reaction mixture into ice water to precipitate a solid, filter it, and then recrystallize it from 80% methanol aqueous solution to obtain intermediate 3; the usage ratio of intermediate 2, resorcinol, anhydrous aluminum chloride, and dimethyl sulfoxide is 26 g:4.9 mL:7.8 g:200 mL;

[0022] The molar ratio of intermediate 2 to resorcinol is controlled to be 1:1.1-1.2, and intermediate 2 and resorcinol undergo Friedel-Crafts acylation reaction under the catalysis of anhydrous aluminum chloride. The reaction process is as follows:

[0023]

[0024] S4, nitrogen was blown into a dry three-necked flask for 30 minutes to expel air and moisture in the flask, and then intermediate 3, triethylamine and dimethyl sulfoxide were added. After stirring and dissolving, 3-aminopropyltriethoxysilane was slowly added. After the addition was completed, the temperature was raised to 50°C and stirred for reaction for 3 hours. After the reaction was completed, it was first cooled to room temperature and then distilled under reduced pressure to obtain intermediate 4; the amount ratio of intermediate 3, 3-aminopropyltriethoxysilane, triethylamine and dimethyl sulfoxide was 22g:9mL:5.6mL:200mL;

[0025] Triethylamine is used as an acid-binding agent to control the molar ratio of intermediate 3 and 3-aminopropyltriethoxysilane to be 1:1.05-1.1. The -Cl of intermediate 3 undergoes a substitution reaction with the -NH2 of 3-aminopropyltriethoxysilane. The reaction process is as follows:

[0026]

[0027] S5. Take dried aluminum hydroxide, magnesium hydroxide, titanium dioxide and calcium carbonate and disperse them in a mixed solution of anhydrous ethanol and water, add acetic acid to adjust the pH to 4, stir evenly and transfer to a three-necked flask; disperse the intermediate 4 in dimethyl sulfoxide, stir for 15 minutes and transfer to the above three-necked flask, after the transfer is completed, heat to 65°C and react for 1 hour, cool to room temperature after the reaction is completed, centrifuge, take the precipitate and ultrasonically vibrate in anhydrous ethanol for 0.5 hours, and finally dry at 80°C for 12 hours to obtain an auxiliary agent; the amount ratio of aluminum hydroxide, magnesium hydroxide, titanium dioxide, calcium carbonate and intermediate 4 is 15g:15g:20g:10g:3g.

[0028] The silanol groups generated by intermediate 4 after hydrolysis will react chemically with the hydroxyl groups on the surfaces of aluminum hydroxide, magnesium hydroxide, titanium dioxide, and calcium carbonate to generate stable chemical bonds. The formation of new chemical bonds reduces the surface energy of aluminum hydroxide, magnesium hydroxide, titanium dioxide, and calcium carbonate, making aluminum hydroxide, magnesium hydroxide, titanium dioxide, and calcium carbonate in a stable state. At the same time, the organic medium on the surface of the particles increases the spatial resistance to agglomeration between the particles, thereby improving the dispersibility of aluminum hydroxide, magnesium hydroxide, titanium dioxide, and calcium carbonate, that is, the dispersion of the additive in the modified adhesive is greatly increased.

[0029] The aluminum hydroxide and magnesium hydroxide in the additives can give the modified adhesive excellent flame retardant and smoke suppression effects; the titanium dioxide in the additives can give the modified adhesive excellent UV resistance; the fine structure and porous structure characteristics of the calcium carbonate in the additives can increase the contact area between the modified adhesive and the bonded material, thereby enhancing the bonding strength of the modified adhesive. At the same time, calcium carbonate can also improve the mechanical properties and heat resistance of the modified adhesive.

[0030] The additive also contains triazine, hindered phenol, and hindered amine structures. Triazine structures, due to the chelate ring formed by intramolecular hydrogen bonds, disrupt the bonds upon absorption of UV light, forming unstable, high-energy ionic compounds. These compounds then release excess energy to return to their original, low-energy, stable state, resulting in strong absorption of UV light in the 280-400nm range. Triazines also offer advantages such as high efficiency, high-temperature resistance, light color, and good compatibility. Hindered phenol structures can capture free radicals generated during the oxidation of polymers, interrupting the free radical chain reaction and preventing further oxidative degradation, thereby enhancing the antioxidant capacity of the modified adhesive. Hindered amine structures achieve photoprotection, photostability, and oxidation resistance by capturing free radicals, decomposing hydroperoxides, quenching singlet oxygen, and capturing heavy metal ions. The hindered amine structure in the additive, when used in combination with hindered phenol and triazine structures, exhibits excellent synergistic effects.

[0031] The additive contains amino groups, which react chemically with the epoxy groups in the epoxy resin and the isocyanate groups in the curing agent. This allows the additive to remain stable in the modified adhesive and fully and stably function. The organic anti-aging structures (hindered amine structures, hindered phenol structures, and triazine structures) and inorganic anti-aging components (titanium dioxide) in the additive work synergistically, giving the modified adhesive with the additive excellent resistance to heat and UV aging. It is not easily aged by factors such as heat and light, ensuring the viscosity of the modified adhesive. The organic flame retardant elements nitrogen and silicon (halogen-free flame retardant elements) and inorganic flame retardant components (aluminum hydroxide and magnesium hydroxide) in the additive work synergistically, giving the modified adhesive with the additive a highly effective, safe, and long-lasting flame retardant and smoke suppression effect. The calcium carbonate in the additive imparts excellent mechanical properties and heat resistance to the modified adhesive.

[0032] Furthermore, the curing agent is one or more of toluene diisocyanate, 2,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and xylylene diisocyanate.

[0033] Furthermore, the solvent is one or more of toluene, chloroform, dimethyl sulfoxide, and tetrahydrofuran.

[0034] Furthermore, the upper bonding layer is formed by curing an acrylic adhesive and has a thickness of 25-30 μm.

[0035] Furthermore, the release film layer is made of polyethylene terephthalate film.

[0036] Furthermore, the release film layer has a thickness of 25-30 μm.

[0037] A method for preparing a multi-layer composite tape comprises the following steps:

[0038] One side of the middle base film layer is corona-treated, and then a modified adhesive is coated and cured at 60-120°C to form a lower adhesive layer. The bottom base film layer is then bonded to one side of the lower adhesive layer. An acrylic adhesive is coated on the release surface of the release film layer and cured at 60-120°C to form an upper adhesive layer. The upper adhesive layer is then bonded to the other side of the middle base film layer and rolled up to obtain a multi-layer composite tape.

[0039] The beneficial effects of the present invention are as follows: the auxiliary agent of the present invention contains calcium carbonate, organic anti-aging structures (hindered amine structure, hindered phenol structure, triazine structure) and inorganic anti-aging components (titanium dioxide), organic flame retardant elements nitrogen, silicon (halogen-free flame retardant element) and inorganic flame retardant components (aluminum hydroxide, magnesium hydroxide), and there is a chemical reaction between the auxiliary agent and the epoxy resin and the curing agent, so the auxiliary agent can be stably present in the modified adhesive and maximize its own role. Therefore, the modified adhesive and multi-layer composite tape of the present invention have excellent and stable heat aging resistance and ultraviolet aging resistance, efficient, safe and long-lasting flame retardant and smoke suppression effects, and excellent mechanical properties and heat resistance. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] Example 1, preparation of auxiliary agent, the specific steps are as follows:

[0042] S1. Purge a 500 mL dry three-necked flask with nitrogen for 30 min to expel air and moisture from the flask. Then, add 25 g of 3,5-di-tert-butyl-4-hydroxybenzoic acid, 0.6 g of EDC, 0.4 g of NHS, and 200 mL of chloroform. After stirring to dissolve, slowly add 20 mL of 2,2,6,6-tetramethylpiperidinamine. Then, heat to 65°C and keep the temperature to react for 6.5 h. After the reaction, cool to room temperature, evaporate under reduced pressure, and purify by column chromatography (a mixed solvent of chloroform and diethyl ether is selected as the eluent, with a volume ratio of chloroform to diethyl ether of 9:1). Then, evaporate under reduced pressure to obtain intermediate 1.

[0043] S2. Nitrogen was blown into a 500 mL dry three-necked flask for 30 min to expel air and moisture from the flask. 27 g of intermediate 1, 11.7 mL of triethylamine, and 240 mL of chloroform were then added. After stirring to dissolve, 13.8 g of cyanuric chloride was slowly added. After the addition was complete, the mixture was stirred and reacted at room temperature for 3 h. After the reaction was completed, the mixture was cooled to room temperature, then distilled under reduced pressure, and purified by column chromatography (a mixed solvent of benzene and diethyl ether was selected as the eluent, with a volume ratio of benzene and diethyl ether of 6:4). Finally, distillation under reduced pressure gave intermediate 2.

[0044] S3. Nitrogen was blown into a 500 mL dry brown three-necked flask for 30 min to expel air and moisture from the flask. Subsequently, 4.9 mL of resorcinol, 7.8 g of anhydrous aluminum chloride, and 200 mL of dimethyl sulfoxide were added and stirred uniformly. Then, 26 g of intermediate 2 was slowly added. The mixture was then heated to 115°C with stirring and reacted at 115°C for 12 h. After the reaction was completed, the reaction mixture was slowly poured into ice water to precipitate a solid, which was filtered and recrystallized from 80% methanol aqueous solution to obtain intermediate 3.

[0045] S4. Purge a 500 mL dry three-necked flask with nitrogen for 30 min to expel air and moisture from the flask. Then, add 22 g of intermediate 3, 5.6 mL of triethylamine, and 200 mL of dimethyl sulfoxide. Stir and dissolve. Then, slowly add 9 mL of 3-aminopropyltriethoxysilane. After the addition is complete, heat to 50 °C and stir to react for 3 h. After the reaction is complete, cool to room temperature and then distill under reduced pressure to obtain intermediate 4.

[0046] S5. Take 15g of dried aluminum hydroxide, 15g of magnesium hydroxide, 20g of titanium dioxide, and 10g of calcium carbonate and disperse them in a mixed solution of 180mL of anhydrous ethanol and 100mL of water, add acetic acid to adjust the pH to 4, stir evenly and transfer to a three-necked flask; disperse 3g of intermediate 4 in 25mL of dimethyl sulfoxide, stir for 15min and transfer to the above three-necked flask, after the transfer is completed, heat to 65℃ and react for 1h, cool to room temperature after the reaction is completed, centrifuge, take the precipitate and ultrasonically vibrate in anhydrous ethanol for 0.5h, and finally dry at 80℃ for 12h to obtain an auxiliary agent.

[0047] Example 2: Preparation of modified adhesive, the specific steps are as follows:

[0048] 50 parts of polybutylene terephthalate, 30 parts of bisphenol A epoxy resin, 10 parts of the auxiliary agent prepared in Example 1 and 20 parts of toluene were fully stirred by weight, and finally 5 parts of toluene diisocyanate were added, stirred thoroughly and filtered to obtain a modified adhesive.

[0049] Example 3, preparing a modified adhesive, the specific steps are as follows:

[0050] 55 parts of polyethylene terephthalate, 36 parts of bisphenol A epoxy resin, 13 parts of the auxiliary agent prepared in Example 1, 18 parts of chloroform and 10 parts of tetrahydrofuran were fully stirred by weight, and finally 6 parts of 2,4-diphenylmethane diisocyanate and 6 parts of hexamethylene diisocyanate were added, stirred thoroughly and filtered to obtain a modified adhesive.

[0051] Example 4: Preparation of modified adhesive, the specific steps are as follows:

[0052] 60 parts of polyethylene terephthalate, 40 parts of bisphenol A epoxy resin, 15 parts of the auxiliary agent prepared in Example 1 and 30 parts of dimethyl sulfoxide were fully stirred by weight, and finally 9 parts of isophorone diisocyanate and 6 parts of xylylene diisocyanate were added, stirred thoroughly and filtered to obtain a modified adhesive.

[0053] Example 5, preparing a modified adhesive, the specific steps are as follows:

[0054] The remaining steps remained unchanged, except that the additives in Example 2 were replaced by 2.38 parts of aluminum hydroxide, 2.38 parts of magnesium hydroxide, 3.17 parts of titanium dioxide, 1.59 parts of calcium carbonate, 0.16 parts of antioxidant 1010, 0.16 parts of light stabilizer 944, and 0.16 parts of ultraviolet absorber UV-531 to prepare a modified adhesive.

[0055] Example 6, preparing a modified adhesive, the specific steps are as follows:

[0056] The remaining steps remained unchanged, only the auxiliary agent in Example 2 was removed to prepare the modified adhesive.

[0057] Example 7: Preparation of a multi-layer composite tape, the specific steps are as follows:

[0058] One side of the middle base film layer (polypropylene film, 20 μm thick) was corona-treated, and then the modified adhesive prepared in Example 2 was coated and cured at 60°C to form a lower adhesive layer (20 μm thick). Then, a bottom base film layer (polypropylene film, 20 μm thick) was bonded to one side of the lower adhesive layer. An acrylic adhesive was applied to the release surface of the release film layer (polyethylene terephthalate film, 25 μm thick) and cured at 60°C to form an upper adhesive layer (25 μm thick). Then, the upper adhesive layer was bonded to the other side of the middle base film layer (polypropylene film, 20 μm thick) and rolled up to obtain a multilayer composite tape.

[0059] Example 8: Preparation of a multi-layer composite tape, the specific steps are as follows:

[0060] One side of the middle base film layer (polyimide film, 50 μm thick) was corona-treated, and then the modified adhesive prepared in Example 3 was coated and cured at 120°C to form a lower adhesive layer (25 μm thick). Then, a bottom base film layer (polyimide film, 50 μm thick) was bonded to one side of the lower adhesive layer. An acrylic adhesive was applied to the release surface of the release film layer (polyethylene terephthalate film, 30 μm thick) and cured at 120°C to form an upper adhesive layer (30 μm thick). Then, the upper adhesive layer was bonded to the other side of the middle base film layer (polyimide film, 50 μm thick) and rolled up to obtain a multilayer composite tape.

[0061] Example 9: Preparation of a multi-layer composite tape, the specific steps are as follows:

[0062] One side of the middle base film layer (polyethylene terephthalate film, 30 μm thick) was corona-treated, and then the modified adhesive prepared in Example 4 was coated and cured at 80°C to form a lower adhesive layer (24 μm thick). Then, a base film layer (polyethylene terephthalate film, 30 μm thick) was laminated to one side of the lower adhesive layer. An acrylic adhesive was applied to the release surface of the release film layer (polyethylene terephthalate film, 28 μm thick) and cured at 80°C to form an upper adhesive layer (28 μm thick). The upper adhesive layer was laminated to the other side of the middle base film layer (polyethylene terephthalate film, 30 μm thick) and then rolled up to obtain a multilayer composite tape.

[0063] Comparative Example 1: Preparation of a multi-layer composite tape, the specific steps are as follows:

[0064] The remaining steps remained unchanged, except that the modified adhesive of Example 7 was replaced by the modified adhesive prepared in Example 5 to prepare a multilayer composite tape.

[0065] Comparative Example 2: A multi-layer composite tape was prepared in the following steps:

[0066] The remaining steps remained unchanged, except that the modified adhesive of Example 7 was replaced by the modified adhesive prepared in Example 6 to prepare a multilayer composite tape.

[0067] Performance Testing

[0068] (1) Heat aging resistance test

[0069] The multi-layer composite tape products prepared in Examples 7-9 and Comparative Examples 1-2 were stretched 200% and half-lapped and wrapped around the connector assembly, and then placed at room temperature for 7 days (moisture curing time). After being placed in an air circulation oven at 160°C for one week, the surface cracking phenomenon and the change in the adhesion of the adhesive layer were observed.

[0070] (2) UV aging resistance test

[0071] The multi-layer composite tape products prepared in Examples 7-9 and Comparative Examples 1-2 were stretched 200% and half-lapped and wrapped around the connector assembly. After UV aging for one week at room temperature and a vertical irradiation distance of 20 cm under a 30W UV lamp, the surface cracking phenomenon and the change in the adhesion of the adhesive layer were observed.

[0072] (3) Flame retardant performance test

[0073] The oxygen index test refers to GB / T 2406-2009, and the vertical burning grade test refers to UL94-2013.

[0074] The test results of all items are shown in the following table:

[0075]

[0076] “-” indicates no combustion level.

[0077] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0078] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A multi-layer composite tape, characterized in that: The adhesive comprises a base film layer, a lower adhesive layer, a middle base film layer, an upper adhesive layer, and a release film layer; the lower adhesive layer is formed by curing a modified adhesive and has a thickness of 20-25 μm; the modified adhesive is prepared by the following steps: 50-60 parts by weight of a polyester resin, 30-40 parts of an epoxy resin, 10-15 parts of an additive, and 20-30 parts of a solvent are thoroughly stirred, and finally 5-15 parts of a curing agent are added, the mixture is thoroughly stirred, and filtered to obtain the modified adhesive; The auxiliary agent is prepared by the following steps: S1. After nitrogen was purged into the flask, 3,5-di-tert-butyl-4-hydroxybenzoic acid, EDC, NHS, and chloroform were added. After stirring, 2,2,6,6-tetramethylpiperidinamine was slowly added. The temperature was raised to 65°C and the reaction was carried out for 6.5 hours. The mixture was cooled, evaporated under reduced pressure, purified by column chromatography, and evaporated under reduced pressure to obtain intermediate 1. The amount ratio of 3,5-di-tert-butyl-4-hydroxybenzoic acid, 2,2,6,6-tetramethylpiperidinamine, EDC, NHS, and chloroform was 25 g:20 mL:0.6 g:0.4 g:200 mL. S2. After nitrogen was purged into the flask, intermediate 1, triethylamine and chloroform were added, and cyanuric chloride was added after stirring. The mixture was reacted at room temperature for 3 h, cooled, and distilled under reduced pressure. The mixture was purified by column chromatography and distilled under reduced pressure to obtain intermediate 2. The ratio of intermediate 1, cyanuric chloride, triethylamine and chloroform was 27 g:13.8 g:11.7 mL:240 mL. S3. After nitrogen purging the flask, resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide were added, and after stirring, intermediate 2 was added. The temperature was raised to 115° C. and the reaction was carried out for 12 hours. After the reaction, the reaction mixture was poured into ice water to precipitate a solid, which was filtered and recrystallized to obtain intermediate 3. The usage ratio of intermediate 2, resorcinol, anhydrous aluminum chloride and dimethyl sulfoxide was 26 g:4.9 mL:7.8 g:200 mL; S4. After nitrogen was purged into the flask, intermediate 3, triethylamine, and dimethyl sulfoxide were added. After stirring, 3-aminopropyltriethoxysilane was added. The temperature was raised to 50°C and the reaction was continued for 3 hours. The mixture was cooled and distilled under reduced pressure to obtain intermediate 4. The amount ratio of intermediate 3, 3-aminopropyltriethoxysilane, triethylamine, and dimethyl sulfoxide was 22 g:9 mL:5.6 mL:200 mL. S5. Disperse aluminum hydroxide, magnesium hydroxide, titanium dioxide, and calcium carbonate in a mixed solution of anhydrous ethanol and water, add acetic acid to adjust the pH to 4, and then transfer the mixture to a flask; disperse the intermediate 4 in dimethyl sulfoxide, stir, and transfer the mixture to the above flask. Heat to 65°C and react for 1 hour. Cool, centrifuge, and ultrasonically vibrate the precipitate in anhydrous ethanol for 0.5 hour, and dry to obtain an auxiliary agent; the dosage ratio of aluminum hydroxide, magnesium hydroxide, titanium dioxide, calcium carbonate, and intermediate 4 is 15g:15g:20g:10g:3g.

2. A multi-layer composite tape according to claim 1, characterized in that: The material of the bottom base film layer and the middle base film layer is one or more of polyethylene terephthalate film, polyimide film, polyethylene naphthalate film, polypropylene film, and polyethylene film, and the thickness of the bottom base film layer and the middle base film layer is 20-50 μm.

3. The multi-layer composite tape according to claim 1, characterized in that: The polyester resin is one or both of polyethylene terephthalate and polybutylene terephthalate.

4. The multi-layer composite tape according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin.

5. The multi-layer composite tape according to claim 1, characterized in that: The curing agent is one or more of toluene diisocyanate, 2,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and xylylene diisocyanate.

6. The multi-layer composite tape according to claim 1, characterized in that: The solvent is one or more of toluene, chloroform, dimethyl sulfoxide and tetrahydrofuran.

7. The multi-layer composite tape according to claim 1, characterized in that: The upper bonding layer is formed by curing an acrylic adhesive and has a thickness of 25-30 μm.

8. The multi-layer composite tape according to claim 1, characterized in that: The release film layer is made of polyethylene terephthalate film, and the thickness of the release film layer is 25-30 μm.

9. The method for preparing a multi-layer composite tape according to claim 1, wherein: The following steps are involved: One side of the middle base film layer is corona-treated, and then a modified adhesive is coated and cured at 60-120°C to form a lower adhesive layer. The bottom base film layer is then bonded to one side of the lower adhesive layer. An acrylic adhesive is coated on the release surface of the release film layer and cured at 60-120°C to form an upper adhesive layer. The upper adhesive layer is then bonded to the other side of the middle base film layer and rolled up to obtain a multi-layer composite tape.

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