A UV-curable high-strength pressure-sensitive structural adhesive tape and preparation method thereof

Abstract

The present application relates to the technical field of pressure-sensitive adhesives. The present application discloses a UV-curable high-strength pressure-sensitive structural adhesive tape and a preparation method thereof. The adhesive tape comprises a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence; the raw material composition of the pressure-sensitive adhesive layer comprises: methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, rubber toughener, initiator, and solvent. The preparation method comprises the following steps: S1, mixing methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, and rubber toughener to obtain a prepolymer; S2, stirring and mixing the prepolymer with an initiator and a solvent to obtain a pressure-sensitive adhesive; S3, coating the pressure-sensitive adhesive on a substrate, baking at 100-180°C, laminating a release film, and obtaining an adhesive tape. The present application also discloses a method for using the adhesive tape. The adhesive tape prepared in the present application has high shear strength, high pull-out strength, and excellent weather resistance.

Description

Technical Field

[0001] The present application relates to the technical field of pressure-sensitive adhesives, and in particular to a UV-curable high-strength pressure-sensitive structural adhesive tape and a preparation method thereof. Background Art

[0002] PET pressure-sensitive tape is made by applying pressure-sensitive adhesive on a strip of PET substrate. The pressure-sensitive adhesive makes the tape have pressure-sensitive adhesion properties and is the most important component of the pressure-sensitive tape. Pressure-sensitive tape is widely used in consumer electronics assembly, automotive glass component fixing, battery cell shell wrapping protection and other fields due to its good initial adhesion and easy operation.

[0003] The existing pressure-sensitive tape is easy to operate and convenient to use, but it has insufficient shear strength and pull-out strength. When used to fix new energy batteries that vibrate for a long time, it is prone to loosening and falling off. After a 1000h aging test at high temperature and humidity at 85 degrees Celsius, its strength is significantly attenuated. Therefore, in order to improve the mechanical properties of pressure-sensitive tape, people began to study UV light-curing pressure-sensitive adhesives.

[0004] UV light-curing pressure-sensitive adhesive is an environmentally friendly adhesive that has pressure-sensitive properties and can be cured by ultraviolet light. Due to its good environmental protection, strong bonding strength, fast curing speed and energy saving characteristics, it has attracted more and more attention, especially in some places where traditional adhesives cannot be used, UV light-curing pressure-sensitive adhesive can be used to achieve bonding. In recent years, with the vigorous development of my country's electronics industry, the future market prospects of UV light-curing pressure-sensitive adhesive in the electronics industry are very broad.

[0005] Therefore, there is an urgent need to develop a UV-curable high-strength pressure-sensitive structural adhesive tape with high shear strength, high tensile strength and excellent weather resistance. Summary of the invention

[0006] In order to solve at least one of the above technical problems, a UV-curable high-strength pressure-sensitive structural tape with high shear strength, high tensile strength and excellent weather resistance is developed. The present application provides a UV-curable high-strength pressure-sensitive structural tape and a preparation method thereof.

[0007] On the one hand, the present application provides a UV-curable high-strength pressure-sensitive structural tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0008] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 25-35 parts of methacrylic resin, 15-25 parts of polyurethane-modified acrylate, 35-45 parts of epoxy-modified acrylic resin, 5-15 parts of rubber toughener, 2-10 parts of initiator, and 120-180 parts of solvent.

[0009] By adopting the above technical solution, the present application adopts specific raw materials and proportions to prepare a UV-curable high-strength pressure-sensitive structural tape with high shear strength, high tensile strength, and excellent weather resistance.

[0010] In this application, methacrylic resin has good bonding performance, and polyurethane modified acrylate can increase the flexibility of the adhesive, which helps to improve the adhesion of the tape, improve the shear strength and pull strength, and also improve the low temperature resistance of the tape. Epoxy modified acrylate further enhances the mechanical strength of the adhesive, and also increases the cross-linking density inside the adhesive layer, thereby improving the shear and pull strength. The rubber toughening body can significantly improve the toughness, crack resistance and impact strength of the tape, making it less likely to break or peel when subjected to dynamic loads.

[0011] Optionally, the raw material composition of the pressure-sensitive adhesive layer includes, by weight: 28 to 32 parts of methacrylic resin, 18 to 22 parts of polyurethane-modified acrylate, 38 to 42 parts of epoxy-modified acrylic resin, 8 to 12 parts of rubber toughener, 5 to 7 parts of initiator, and 140 to 160 parts of solvent.

[0012] Optionally, the raw material composition of the pressure-sensitive adhesive layer includes, by weight: 30 parts of methacrylic resin, 20 parts of polyurethane-modified acrylate, 40 parts of epoxy-modified acrylic resin, 10 parts of rubber toughener, 6 parts of initiator, and 150 parts of solvent.

[0013] Optionally, the preparation method of the polyurethane modified acrylate is as follows: heating the diisocyanate to 50-70° C., adding polyethylene glycol dropwise, keeping the temperature for 3-5 hours after the addition is completed, cooling down, and obtaining product A; heating the acrylate monomer under light-proof conditions, adding ethanolamine dropwise, keeping the temperature for 1-2 days after the addition is completed, cooling down, and obtaining product B; heating the product B to 50-70° C. under argon protection and light-proof conditions, adding the product A dropwise, keeping the temperature for 3-5 hours after the addition is completed, cooling down, and obtaining polyurethane modified acrylate;

[0014] Among them, the weight ratio of the diisocyanate to the polyethylene glycol is 2:1; the weight ratio of the acrylate monomer to the ethanolamine is 2:1; and the weight ratio of the product A to the product B is 1:1.

[0015] By adopting the above technical solution, the polyurethane-modified acrylate of the present application provides excellent flexibility, good weather resistance and optical properties, and can significantly improve the bonding strength of the adhesive, including shear strength, tensile strength and peel strength.

[0016] Optionally, the preparation method of the epoxy-modified acrylic resin is: methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate are mixed to obtain a mixed solution; half of the mixed solution is heated to 60-70° C. to obtain a primary reactant; the remaining mixed solution is added dropwise to the primary reactant, and the mixture is reacted at 60-70° C. for 10-20 hours to obtain the epoxy-modified acrylic resin;

[0017] Wherein, the weight ratio of methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate is 70-90:12-18:4-6:0.4-0.6:120-180.

[0018] By adopting the above technical solution, the epoxy-modified acrylic resin of the present application can improve the shear strength, tensile strength and peel strength of the adhesive, and enhance its adhesion to different materials, especially metal surfaces. It can also optimize temperature resistance, improve flexibility, increase the toughness of the adhesive while ensuring strength, and prevent cracking or embrittlement caused by temperature changes or stress concentration.

[0019] Optionally, the rubber toughener is selected from at least one of ethylene propylene rubber, chloroprene rubber, styrene butadiene rubber and butadiene rubber.

[0020] By adopting the above technical solution, the rubber toughening body of the present application can improve the toughness, impact resistance and fatigue strength of the adhesive, thereby enhancing the durability and tear resistance of the tape.

[0021] Optionally, the initiator is selected from at least one of diphenyliodonium hexafluorophosphate, 4-octyloxydiphenyliodonium hexafluoroantimonate and triphenylsulfonium hexafluorophosphate.

[0022] By adopting the above technical solution, the initiator of the present application has good photosensitivity and high initiation efficiency. When used, it can quickly respond to ultraviolet light stimulation, accelerate the curing reaction of the polymer, shorten the curing time, and improve production efficiency.

[0023] Optionally, the solvent is selected from at least one of methyl isobutyl ketone, acetone, xylene and ethylbenzene.

[0024] In a second aspect, the present application provides a method for preparing the above-mentioned UV-curable high-strength pressure-sensitive structural tape, comprising the following steps:

[0025] S1, mixing the methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, and rubber toughening agent to prepare a prepolymer;

[0026] S2, stirring and mixing the prepolymer, initiator and solvent to obtain a pressure-sensitive adhesive;

[0027] S3, coating the pressure-sensitive adhesive on a substrate, baking at 100-180° C., laminating a release film, and preparing a UV-curable high-strength pressure-sensitive structural tape.

[0028] By adopting the above technical scheme, the preparation method adopted in the present application is simple and easy to operate, and the step-by-step mixing enables good compatibility between the components, which is conducive to ensuring the stability of the tape performance and improving the performance of the tape.

[0029] In a third aspect, the present application provides a method for using the above-mentioned UV-curable high-strength pressure-sensitive structural tape, comprising the following steps: attaching the UV-curable high-strength pressure-sensitive structural tape to a metal surface and curing it by UV radiation.

[0030] By adopting the above technical solution, the present application adopts UV curing, which can enable the tape to quickly form a high-strength adhesive layer, greatly improving production efficiency.

[0031] Optionally, the wavelength of the UV radiation is 300-400 nm, and the radiation dose is 3000-10000 mJ / cm 2 .

[0032] By adopting the above technical solution, the wavelength and radiation dose used in this application can effectively excite the photoinitiator in the adhesive and ensure its full activation to obtain higher mechanical properties and bonding strength.

[0033] In summary, the present invention includes at least one of the following beneficial technical effects:

[0034] 1. The present application adopts specific raw materials and proportions to produce a UV-curable high-strength pressure-sensitive structural tape with high shear strength, high tensile strength, and excellent weather resistance.

[0035] 2. The UV-curable high-strength pressure-sensitive structural tape of the present application not only maintains the convenient operability of traditional pressure-sensitive tape, but also has higher shear strength and pull-out strength.

[0036] 3. The preparation method adopted in the present application is simple and easy to operate, and the step-by-step mixing enables good compatibility between the components, which is beneficial to ensure the stability of the tape performance and improve the performance of the tape.

[0037] 4. This application adopts UV curing, which can enable the tape to quickly form a high-strength adhesive layer. DETAILED DESCRIPTION

[0038] The present application is further described in detail below with reference to the embodiments.

[0039] The present application designs a UV-curable high-strength pressure-sensitive structural tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0040] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 25-35 parts of methacrylic resin, 15-25 parts of polyurethane-modified acrylate, 35-45 parts of epoxy-modified acrylic resin, 5-15 parts of rubber toughener, 2-10 parts of initiator, and 120-180 parts of solvent.

[0041] The UV-curable high-strength pressure-sensitive structural tape of the present application is prepared by the following method, comprising the following steps:

[0042] S1, mixing the methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, and rubber toughening agent to prepare a prepolymer;

[0043] S2, stirring and mixing the prepolymer, initiator and solvent to obtain a pressure-sensitive adhesive;

[0044] S3, coating the pressure-sensitive adhesive on a substrate, baking at 100-180° C., laminating a release film, and preparing a UV-curable high-strength pressure-sensitive structural tape.

[0045] The method for using the UV-curable high-strength pressure-sensitive structural adhesive tape of the present application comprises the following steps: attaching the UV-curable high-strength pressure-sensitive structural adhesive tape to a metal surface and curing it by UV radiation.

[0046] The applicant has designed the technical solution of the present application to address the problems of poor shear strength, pull-out strength and weather resistance of existing pressure-sensitive adhesives.

[0047] Firstly, the UV curable high-strength pressure-sensitive structural adhesive tape of the present application is proposed, which comprises a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence; the raw material composition of the pressure-sensitive adhesive layer comprises: methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, rubber toughening body, initiator, and solvent. The obtained adhesive tape has high shear strength, high pull-out strength, and excellent weather resistance.

[0048] The raw materials used in this application are as follows:

[0049] Methacrylate resin: Qiyuan (Guangdong) Pharmaceutical Chemical Co., Ltd.

[0050] Diisocyanate: Shanghai Runjie Chemical Reagent Co., Ltd.

[0051] Polyethylene glycol: CAS: 25322-68-3, molecular weight 2000.

[0052] Ethanolamine: CAS: 141-43-5.

[0053] Methyl acrylate: CAS: 96-33-3.

[0054] Butyl acrylate: CAS: 141-32-2.

[0055] Glycidyl methacrylate: CAS: 106-91-2.

[0056] Azobisisobutyronitrile: CAS: 78-67-1.

[0057] Ethyl acetate: CAS: 141-78-6.

[0058] Ethylene propylene rubber: CAS: 9010-79-1.

[0059] Neoprene: CAS: 9010-98-4.

[0060] Diphenyliodonium hexafluorophosphate: CAS: 58109-40-3.

[0061] 4-Octyloxydiphenyliodonium hexafluoroantimonate: CAS: 121239-75-6.

[0062] Methyl isobutyl ketone: CAS: 108-10-1.

[0063] Acetone: CAS: 67-64-1. Specific embodiments

[0065] The preparation method of the polyurethane modified acrylate used in Examples 1 to 5 is as follows: heating the diisocyanate to 60°C, adding polyethylene glycol dropwise, keeping the temperature for 4 hours after the addition is completed, cooling, and obtaining product A; heating the acrylate monomer under light-proof conditions, adding ethanolamine dropwise, keeping the temperature for 2 days after the addition is completed, cooling, and obtaining product B; under argon protection and light-proof conditions, heating the product B to 60°C, adding the product A dropwise, keeping the temperature for 4 hours after the addition is completed, cooling, and obtaining polyurethane modified acrylate; wherein the weight ratio of the diisocyanate to the polyethylene glycol is 2:1; the weight ratio of the acrylate monomer to the ethanolamine is 2:1; and the weight ratio of the product A to the product B is 1:1.

[0066] The preparation method of the epoxy-modified acrylic resin used in Examples 1 to 5 is as follows: methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate are mixed to obtain a mixed solution; half of the mixed solution is heated to 65° C. to obtain a primary reactant; the remaining mixed solution is added dropwise to the primary reactant, and the mixture is reacted at 65° C. for 15 hours to obtain the epoxy-modified acrylic resin;

[0067] Wherein, the weight ratio of methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate is 80:15:5:0.5:150.

[0068] Embodiments 1 to 5

[0069] Example 1

[0070] This embodiment provides a UV-curable high-strength pressure-sensitive structural adhesive tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0071] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 25 parts of methacrylic resin, 25 parts of polyurethane-modified acrylate, 35 parts of epoxy-modified acrylic resin, 15 parts of rubber toughener, 2 parts of initiator, and 120 parts of solvent.

[0072] The rubber toughener is ethylene propylene rubber; the initiator is diphenyl iodine hexafluorophosphate; and the solvent is acetone.

[0073] The preparation method comprises the following steps:

[0074] S1, mixing methacrylic resin, polyurethane modified acrylate, epoxy modified acrylic resin and rubber toughening body to prepare a prepolymer;

[0075] S2, stirring and mixing the prepolymer, the initiator and the solvent to obtain a pressure-sensitive adhesive;

[0076] S3, coating the pressure-sensitive adhesive on the substrate, baking at 140° C., laminating the release film, and preparing a UV-curable high-strength pressure-sensitive structural tape.

[0077] The method of use comprises the following steps: applying a UV-curable high-strength pressure-sensitive structural tape to the metal surface of the battery core aluminum shell, curing with UV radiation, with a wavelength of 300nm and a radiation dose of 3000mJ / cm 2 .

[0078] The preparation and use methods of Examples 2 to 4 are consistent with those of Example 1.

[0079] Example 2

[0080] This embodiment provides a UV-curable high-strength pressure-sensitive structural adhesive tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0081] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 32 parts of methacrylic resin, 18 parts of polyurethane-modified acrylate, 42 parts of epoxy-modified acrylic resin, 8 parts of rubber toughener, 7 parts of initiator, and 160 parts of solvent.

[0082] The rubber toughener is ethylene propylene rubber; the initiator is diphenyl iodine hexafluorophosphate; and the solvent is acetone.

[0083] Example 3

[0084] This embodiment provides a UV-curable high-strength pressure-sensitive structural adhesive tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0085] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 30 parts of methacrylic resin, 20 parts of polyurethane-modified acrylate, 40 parts of epoxy-modified acrylic resin, 10 parts of rubber toughener, 6 parts of initiator, and 150 parts of solvent.

[0086] The rubber toughener is ethylene propylene rubber; the initiator is diphenyl iodine hexafluorophosphate; and the solvent is acetone.

[0087] Example 4

[0088] This embodiment provides a UV-curable high-strength pressure-sensitive structural adhesive tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0089] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 28 parts of methacrylic resin, 22 parts of polyurethane-modified acrylate, 38 parts of epoxy-modified acrylic resin, 12 parts of rubber toughener, 5 parts of initiator, and 140 parts of solvent.

[0090] The rubber toughener is ethylene propylene rubber; the initiator is diphenyl iodine hexafluorophosphate; and the solvent is acetone.

[0091] Example 5

[0092] This embodiment provides a UV-curable high-strength pressure-sensitive structural adhesive tape, comprising a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence;

[0093] The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 35 parts of methacrylic resin, 15 parts of polyurethane-modified acrylate, 45 parts of epoxy-modified acrylic resin, 5 parts of rubber toughener, 10 parts of initiator, and 180 parts of solvent.

[0094] The rubber toughener is ethylene propylene rubber; the initiator is diphenyl iodine hexafluorophosphate; and the solvent is acetone.

[0095] Comparative Examples 1 to 4

[0096] Comparative Example 1

[0097] The difference between Comparative Example 1 and Example 3 is that in Comparative Example 1, the polyurethane-modified acrylate is replaced with an equal amount of methacrylic resin.

[0098] Comparative Example 2

[0099] The difference between Comparative Example 2 and Example 3 is that in Comparative Example 2, the epoxy-modified acrylic resin is replaced with an equal amount of methacrylic resin.

[0100] Comparative Example 3

[0101] The difference between Comparative Example 3 and Example 3 is that Comparative Example 3 does not have the premixing step of step S1, but all the raw materials are stirred and mixed at the same time to prepare the pressure-sensitive adhesive.

[0102] Comparative Example 4

[0103] The difference between Comparative Example 4 and Example 3 is that the adhesive tape of Comparative Example 4 is not cured by UV radiation.

[0104] Experimental testing

[0105] Test items and test methods

[0106] The shear strength of the tape after UV curing is tested according to GB / T 33332-2016 "Test method for dynamic shear strength of adhesive tape".

[0107] Pull-out strength: The pull-out strength is measured by using a design scheme with a layer of pressure-sensitive adhesive and T-shaped aluminum blocks on both sides. The pressure-sensitive tape is attached to the 3003 T-shaped aluminum block, UV-cured, and a 0.2mm pressure-sensitive adhesive is applied to the back of the substrate. A T-shaped aluminum block of the same size is attached to the pressure-sensitive adhesive. After standing at room temperature for 7 days, the fixture is symmetrically fixed on the clamp of the tensile machine, the tensile machine is started, and the specimen is stretched at a speed of 5mm / min. The maximum value at the time of failure is recorded as the failure load of the specimen.

[0108] Weathering resistance test:

[0109] 1. Double 85 test: Place the UV-cured sample in an environment with a high temperature of 85°C and a relative humidity of 85% for 1000 hours, and then test the shear strength again;

[0110] 2. Hot and cold shock test: The UV-cured samples were exposed to -40°C and 80°C alternately for 168 cycles to test the shear strength.

[0111] The shear strength, pull-out strength and weather resistance of the UV-curable high-strength pressure-sensitive structural adhesive tapes prepared in Examples 1 to 5 and Comparative Examples 1 to 4 were tested. The test results are shown in Table 1.

[0112] Table 1

[0113]

[0114] From the test results in Table 1, it can be seen that the UV-curable high-strength pressure-sensitive structural tapes prepared in Examples 1 to 5 have high pull-out strength, high shear strength and excellent weather resistance.

[0115] Comparative Example 1 does not contain polyurethane modified acrylate, and Comparative Example 2 does not contain epoxy modified acrylic resin. The pull-out strength, shear strength and weather resistance of the prepared tape are all reduced.

[0116] In Comparative Example 3, the raw materials are mixed in one step, and the tensile strength, shear strength and weather resistance of the obtained tape are all inferior to those of Example 3.

[0117] The adhesive tape of Comparative Example 4 was not UV-cured, and its pull-out strength, shear strength and weather resistance were significantly reduced.

[0118] Embodiments 6 to 10

[0119] Example 6

[0120] The difference between Example 6 and Example 3 is that in Example 6, the rubber toughening body is chloroprene rubber.

[0121] Example 7

[0122] The difference between Example 7 and Example 3 is that in Example 7, the initiator is 4-octyloxydiphenyliodonium hexafluoroantimonate.

[0123] Example 8

[0124] The difference between Example 8 and Example 3 is that in Example 8, the solvent is methyl isobutyl ketone.

[0125] Example 9

[0126] The difference between Example 9 and Example 3 is that in Example 9, UV radiation curing is used, the wavelength is 350nm, and the radiation dose is 6500mJ / cm 2 .

[0127] Example 10

[0128] The difference between Example 10 and Example 3 is that in Example 10, UV radiation curing is used, the wavelength is 400nm, and the radiation dose is 10000mJ / cm 2 .

[0129] The shear strength, tensile strength and weather resistance of the UV-curable high-strength pressure-sensitive structural tapes prepared in Examples 6 to 10 were tested. The test results are shown in Table 2.

[0130] Table 2

[0131]

[0132] From the test results in Table 2, it can be seen that the pull-out strength, shear strength and weather resistance of the adhesive tapes prepared in Examples 6 to 8 are similar to those in Example 3.

[0133] Among Example 9, Example 10 and Example 3, the adhesive tape prepared in Example 9 has the best pull-out strength, shear strength and weather resistance.

[0134] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A UV-curable high-strength pressure-sensitive structural tape, characterized in that: It includes a substrate layer, a pressure-sensitive adhesive layer and a release film layer laminated in sequence; The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 25-35 parts of methacrylic resin, 15-25 parts of polyurethane-modified acrylate, 35-45 parts of epoxy-modified acrylic resin, 5-15 parts of rubber toughener, 2-10 parts of initiator, and 120-180 parts of solvent; the initiator is selected from at least one of diphenyliodonium hexafluorophosphate and 4-octyloxydiphenyliodonium hexafluoroantimonate; The preparation method of the polyurethane modified acrylate is as follows: heating the diisocyanate to 50-70° C., dropping polyethylene glycol, keeping the temperature for 3-5 hours after the dropping is completed, cooling down, and obtaining product A; heating the acrylate monomer under light-proof conditions, dropping ethanolamine, keeping the temperature for 1-2 days after the dropping is completed, cooling down, and obtaining product B; heating the product B to 50-70° C. under argon protection and light-proof conditions, dropping the product A, keeping the temperature for 3-5 hours after the dropping is completed, cooling down, and obtaining polyurethane modified acrylate; The preparation method of the epoxy modified acrylic resin comprises: mixing methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate to obtain a mixed solution; heating half of the mixed solution to 60-70° C. to obtain a primary reactant; dripping the remaining mixed solution into the primary reactant, reacting at 60-70° C. for 10-20 hours to obtain the epoxy modified acrylic resin; The method for preparing the UV-curable high-strength pressure-sensitive structural tape comprises the following steps: S1, mixing the methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, and rubber toughening agent to prepare a prepolymer; S2, stirring and mixing the prepolymer, initiator and solvent to obtain a pressure-sensitive adhesive; S3, coating the pressure-sensitive adhesive on a substrate, baking at 100-180° C., laminating a release film, and preparing a UV-curable high-strength pressure-sensitive structural tape.

2. The UV-curable high-strength pressure-sensitive structural adhesive tape according to claim 1, characterized in that: The raw material composition of the pressure-sensitive adhesive layer includes, by weight: 28-32 parts of methacrylic resin, 18-22 parts of polyurethane-modified acrylate, 38-42 parts of epoxy-modified acrylic resin, 8-12 parts of rubber toughener, 5-7 parts of initiator, and 140-160 parts of solvent.

3. The UV-curable high-strength pressure-sensitive structural adhesive tape according to claim 1, characterized in that: In the raw materials for preparing polyurethane-modified acrylate, the weight ratio of the diisocyanate to the polyethylene glycol is 2:1; the weight ratio of the acrylate monomer to the ethanolamine is 2:1; and the weight ratio of the product A to the product B is 1:

1.

4. The UV-curable high-strength pressure-sensitive structural adhesive tape according to claim 1, characterized in that: In the raw materials for preparing epoxy modified acrylic resin, the weight ratio of methyl acrylate, butyl acrylate, glycidyl methacrylate, azobisisobutyronitrile and ethyl acetate is 70-90:12-18:4-6:0.4-0.6:120-180.

5. The UV-curable high-strength pressure-sensitive structural adhesive tape according to claim 1, characterized in that: The rubber toughener is selected from at least one of ethylene propylene rubber, chloroprene rubber, styrene butadiene rubber and butadiene rubber.

6. The UV-curable high-strength pressure-sensitive structural adhesive tape according to claim 1, characterized in that: The solvent is selected from at least one of methyl isobutyl ketone, acetone, xylene and ethylbenzene.

7. A method for preparing the UV-curable high-strength pressure-sensitive structural adhesive tape according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, mixing the methacrylic resin, polyurethane-modified acrylate, epoxy-modified acrylic resin, and rubber toughening agent to prepare a prepolymer; S2, stirring and mixing the prepolymer, initiator and solvent to obtain a pressure-sensitive adhesive; S3, coating the pressure-sensitive adhesive on a substrate, baking at 100-180° C., laminating a release film, and preparing a UV-curable high-strength pressure-sensitive structural tape.

8. A method for using the UV-curable high-strength pressure-sensitive structural adhesive tape according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: laminating the UV curing high-strength pressure-sensitive structural adhesive tape to a metal surface and curing the tape by UV radiation.

9. The method for using the UV curable high-strength pressure-sensitive structural tape according to claim 8, characterized in that: The wavelength of the UV radiation is 300-400 nm, and the radiation dose is 3000-10000 mJ / cm 2 .

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