A UV-curable high-performance pressure-sensitive adhesive tape and its preparation method and application

Abstract

The present invention relates to the technical field of pressure-sensitive tapes, and specifically discloses a UV-curable high-performance pressure-sensitive tape and a preparation method and application thereof. A UV-curable high-performance pressure-sensitive tape comprises a release film, a pressure-sensitive adhesive and a blue substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100-200 parts of polyethylene glycol acrylate, 10-30 parts of isobornyl acrylate, 10-30 parts of pentaerythritol triacrylate, 20-40 parts of dithiodiphenyl sulfide, 5-10 parts of vinyl grafted modified chitosan, 5-10 parts of photoinitiator, 4-8 parts of vinyl indole, 10-20 parts of active diluent, 1-10 parts of rare earth oxide, and 20-40 parts of solvent. The pressure-sensitive tape of the present invention has significant adhesive properties, high peel strength and shear strength, and no residual adhesive phenomenon after peeling, and can be used as a blue film tape and applied to new energy vehicle batteries.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesive tapes, and more specifically, to a UV-curable high-performance pressure-sensitive adhesive tape and a preparation method and application thereof. Background Art

[0002] Pressure-sensitive tape is a type of pressure-sensitive adhesive film material that can be bonded by applying an appropriate amount of pressure without the need for auxiliary curing such as heating, catalysts, or UV light irradiation. The adhesion performance of pressure-sensitive adhesive depends on its molecular structure and formula, as well as the properties of the surface of the adherend. In the application of pressure-sensitive tape, blue film tape, as an important insulating and protective material, has many advantages, such as resistance to high-voltage breakdown, puncture resistance, good tensile strength, convenient direct bonding operation, high cleanliness, strong adhesion, and high cost performance. It plays a key role in power battery assembly, electrical insulation, and the packaging of various aluminum shell battery PACKs.

[0003] At present, in the use of blue film tape, due to the adverse reaction or physical separation of the adhesive component or substrate characteristics of the pressure-sensitive tape with the surface of the adherend under certain conditions, the tape leaves residual adhesive after being removed, which not only affects the aesthetics of the product, but also may cause pollution to the surface of the adherend, affecting the subsequent process; and due to its unique color properties, the application of UV curing technology has encountered challenges; front irradiation cannot achieve curing because light cannot penetrate the blue film; and although back irradiation is feasible, it is difficult to accurately control the curing time in actual operation, which ultimately leads to low bonding performance of the blue film tape and cannot fully meet the use requirements of power batteries under complex working conditions.

[0004] Based on the above statements, the present invention provides a UV-curable high-performance pressure-sensitive adhesive tape and a preparation method thereof. Summary of the invention

[0005] In order to solve the problems of poor adhesive performance and residual adhesive in the existing blue film tape, the present invention provides a UV-curable high-performance pressure-sensitive tape and a preparation method thereof.

[0006] In a first aspect, the present invention provides a UV-curable high-performance pressure-sensitive adhesive tape, which adopts the following technical solution:

[0007] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a release film, a pressure-sensitive adhesive and a blue substrate film; one side of the pressure-sensitive adhesive is the release film, and the other side is the blue substrate film;

[0008] The pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100-200 parts of polyethylene glycol acrylate, 10-30 parts of isobornyl acrylate, 10-30 parts of pentaerythritol triacrylate, 20-40 parts of dithiodiphenyl sulfide, 5-10 parts of vinyl grafted modified chitosan, 5-10 parts of photoinitiator, 4-8 parts of vinyl indole, 10-20 parts of active diluent, 1-10 parts of rare earth oxide and 20-40 parts of solvent.

[0009] Preferably, the vinyl grafted modified chitosan is prepared by the following method:

[0010] Dissolve carboxymethyl chitosan and vinyl-containing silane coupling agent in water, adjust the pH value to 1-2 with hydrochloric acid, and stir the reaction at 40-50°C for 8-12 hours; when the reaction is finished, add triethanolamine to adjust the pH value to neutral, let it stand at 1-5°C for 1-2 hours, rotary evaporate, and dry to obtain vinyl-grafted modified chitosan.

[0011] Preferably, the vinyl-containing silane coupling agent is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, methylvinyldiethoxysilane, vinyltriisopropoxysilane, methacryloxypropyltrimethoxysilane and methacryloxypropyltriethoxysilane.

[0012] Preferably, the mass ratio of the carboxymethyl chitosan, the vinyl-containing silane coupling agent and water is 20-30:7-10:100.

[0013] Preferably, the concentration of the hydrochloric acid is 1-1.5 mol / L.

[0014] Preferably, the photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2-9:3.

[0015] Preferably, the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate and / or 6-vinyl-1H-indole.

[0016] Preferably, the reactive diluent is at least one of ethylene glycol dimethacrylate, tripropylene glycol diacrylate, neopentyl glycol diacrylate and dipropylene glycol diacrylate.

[0017] Preferably, the rare earth oxide is at least one of nano-lanthanum oxide, nano-cerium oxide, and nano-yttrium oxide.

[0018] Preferably, the solvent is at least one of acetone, butanone, methanol, isopropanol, ethyl acetate and toluene.

[0019] In a second aspect, the present invention provides a method for preparing a UV-curable high-performance pressure-sensitive adhesive tape, which adopts the following technical solution:

[0020] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0021] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0022] The pressure-sensitive adhesive is coated on a blue substrate film, a release film is attached to the other side, and the film is cured by irradiation with a UV curing lamp to obtain a pressure-sensitive adhesive tape.

[0023] In a third aspect, the present invention provides an application of a UV-curable high-performance pressure-sensitive adhesive tape, using the following technical solution:

[0024] A UV-curable high-performance pressure-sensitive tape is used as a blue film tape in new energy vehicle batteries.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. The raw materials of the pressure-sensitive adhesive in the UV-curable high-performance pressure-sensitive adhesive tape of the present invention include polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent, and rare earth oxide. Under UV backlight irradiation, the pressure-sensitive adhesive tape can be completely cured. The obtained pressure-sensitive adhesive tape has excellent peel strength and shear strength, and can be better fixed on the battery pack; and there is no residual adhesive phenomenon, and multiple repair and rework operations can be carried out.

[0027] 2. The present invention adopts hydrolysis-condensation reaction to graft vinyl into the molecular chain of carboxymethyl chitosan to obtain vinyl grafted modified chitosan. The vinyl grafted modified chitosan can react with acrylate group and thiol group under the action of UV to form an interpenetrating structure, so that the modified chitosan molecules are stably linked to the pressure-sensitive adhesive, the network density inside the pressure-sensitive adhesive is enhanced, the cohesive force is improved, and the bonding performance of the pressure-sensitive adhesive tape is enhanced; at the same time, due to the increase in cross-linking density, the residual pressure-sensitive adhesive after peeling off the pressure-sensitive adhesive tape is greatly reduced.

[0028] 3. The photoinitiator of the present invention is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate. During the UV curing process, both of them will undergo polymerization reaction. By controlling the mass ratio of the two, the complementary and enhanced photoinitiating effect is achieved, thereby better regulating the UV curing process, improving the stability of the photoinitiating system, and obtaining a pressure-sensitive adhesive with better performance.

[0029] 4. The pressure-sensitive adhesive of the present invention includes vinyl indole. On the one hand, the vinyl group can participate in the cross-linking reaction. On the other hand, the introduced indole group can form a cation-π effect with the cation increased by the cationic photoinitiator. The two aspects work together to improve the cohesion of the pressure-sensitive adhesive.

[0030] 5. The preparation method of the pressure-sensitive tape of the present invention has simple steps and low cost. During the preparation process, various process parameters are controlled to promote the interaction between various raw materials. Under UV light, a high-performance pressure-sensitive tape can be obtained, which can be used as a blue film tape and is widely used in new energy vehicle batteries to ensure the safety and stability of the batteries. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the embodiments.

[0032] The materials and reagents used in the present invention, unless otherwise specified, can be obtained from commercial sources; among them, carboxymethyl chitosan, CAS No. 83512-85-0, was purchased from Xi'an Rongbai Biotechnology Co., Ltd. (purity is deacetylation degree> 90%); polyethylene glycol acrylate, CAS No. 9051-31-4, was purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd. (purity is 99%); isobornyl acrylate, CAS No. 5888-33-5, was purchased from Nantong Runfeng Petrochemical Co., Ltd. (purity is 95%); pentaerythritol triacrylate, CAS No. 3524-68-3, was purchased from Nantong Runfeng Petrochemical Co., Ltd. Oil Chemical Co., Ltd. (purity 99%); o-chlorohexaarylbiimidazole, CAS No. 1707-68-2, purchased from Shanghai Chuangsai Technology Co., Ltd. (purity 95%); (4-octyloxyphenyl)benzidonium hexafluoroantimonate, CAS No. 121239-74-5, purchased from Hubei Hongfuda Biotechnology Co., Ltd.; tert-butyl 5-vinylindole-1-carboxylate, CAS No. 1158744-48-9, purchased from Shanghai Haohong Biotechnology Co., Ltd.; 6-vinyl-1H-indole, CAS No. 865375-46-8, purchased from Jiangsu Aikang Biomedicine Research and Development Co., Ltd.

[0033] Preparation Example 1-5 provides a method for preparing vinyl grafted modified chitosan.

[0034] Preparation Example 1:

[0035] Vinyl grafted modified chitosan is prepared by the following method:

[0036] 20g of carboxymethyl chitosan and 4g of vinyl-containing silane coupling agent were dissolved in 100g of water, and the pH value was adjusted to 2 with 1mol / L hydrochloric acid, and the mixture was stirred at 40°C for 82h. When the reaction was over, triethanolamine was added to adjust the pH value to neutral, and the mixture was allowed to stand at 5°C for 2h, and then rotary evaporated and dried to obtain vinyl-grafted chitosan.

[0037] Wherein, the vinyl-containing silane coupling agent is vinyltrimethoxysilane.

[0038] Preparation Example 2:

[0039] Vinyl grafted modified chitosan is prepared by the following method:

[0040] 25 g of carboxymethyl chitosan and 8 g of vinyl-containing silane coupling agent were dissolved in 100 g of water, and the pH value was adjusted to 1.5 with 1.25 mol / L hydrochloric acid, and the mixture was stirred at 45°C for 10 h. When the reaction was over, triethanolamine was added to adjust the pH value to neutral, and the mixture was allowed to stand at 3°C ​​for 1.5 h, and then rotary evaporated and dried to obtain vinyl-grafted chitosan.

[0041] The vinyl-containing silane coupling agent is obtained by mixing vinyl trimethoxy silane and methyl vinyl diethoxy silane in a mass ratio of 1:1.

[0042] Preparation Example 3:

[0043] Vinyl grafted modified chitosan is prepared by the following method:

[0044] 30g of carboxymethyl chitosan and 10g of vinyl-containing silane coupling agent were dissolved in 100g of water, and the pH value was adjusted to 1 with 1.5mol / L hydrochloric acid, and the mixture was stirred at 50°C for 12h. When the reaction was over, triethanolamine was added to adjust the pH value to neutral, and the mixture was allowed to stand at 1°C for 1h, and then rotary evaporated and dried to obtain vinyl-grafted chitosan.

[0045] The vinyl-containing silane coupling agent is obtained by mixing methylvinyldiethoxysilane and methacryloxypropyltrimethoxysilane in a mass ratio of 1:1.

[0046] Preparation Example 4:

[0047] Vinyl grafted modified chitosan is prepared by the following method:

[0048] 20g of carboxymethyl chitosan and 4g of vinyl-containing silane coupling agent were dissolved in 100g of water, and the pH value was adjusted to 2 with 1mol / L hydrochloric acid, and the mixture was stirred at 40°C for 82h. When the reaction was over, triethanolamine was added to adjust the pH value to neutral, and the mixture was allowed to stand at 5°C for 2h, and then rotary evaporated and dried to obtain vinyl-grafted chitosan.

[0049] The vinyl-containing silane coupling agent is obtained by mixing vinyl trimethoxy silane and vinyl triisopropoxy silane in a mass ratio of 1:1.

[0050] Preparation Example 5:

[0051] Vinyl grafted modified chitosan is prepared by the following method:

[0052] 20g of carboxymethyl chitosan and 4g of vinyl-containing silane coupling agent were dissolved in 100g of water, and the pH value was adjusted to 2 with 1mol / L hydrochloric acid, and the mixture was stirred at 40°C for 82h. When the reaction was over, triethanolamine was added to adjust the pH value to neutral, and the mixture was allowed to stand at 5°C for 2h, and then rotary evaporated and dried to obtain vinyl-grafted chitosan.

[0053] The vinyl-containing silane coupling agent is obtained by mixing vinyl trimethoxy silane, methacryloxypropyl triethoxy silane and vinyl triisopropoxy silane in a mass ratio of 1:1:1.

[0054] Embodiment 1-7 provides a UV-curable high-performance pressure-sensitive adhesive tape and a preparation method thereof.

[0055] Embodiment 1:

[0056] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0057] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is prepared by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0058] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0059] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0060] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side. The film was irradiated and cured by a 2000 mj 365 nm UV curing lamp for 20 minutes to obtain a pressure-sensitive adhesive tape.

[0061] Embodiment 2:

[0062] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 150 parts of polyethylene glycol acrylate, 20 parts of isobornyl acrylate, 20 parts of pentaerythritol triacrylate, 30 parts of dithiodiphenyl sulfide, 8 parts of vinyl grafted modified chitosan, 8 parts of a photoinitiator, 6 parts of vinyl indole, 15 parts of an active diluent, 5 parts of a rare earth oxide, and 30 parts of a solvent;

[0063] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 2; the photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:1; the vinyl indole is 6-vinyl-1H-indole; the active diluent is obtained by mixing ethylene glycol dimethacrylate and tripropylene glycol diacrylate in a mass ratio of 1:1; the rare earth oxide is nano cerium oxide; the solvent is obtained by mixing acetone and toluene in a mass ratio of 1:1;

[0064] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0065] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0066] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side. The film was irradiated and cured by a 2000 mj 365 nm UV curing lamp for 20 minutes to obtain a pressure-sensitive adhesive tape.

[0067] Embodiment 3:

[0068] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 200 parts of polyethylene glycol acrylate, 30 parts of isobornyl acrylate, 10 parts of pentaerythritol triacrylate, 40 parts of dithiodiphenyl sulfide, 10 parts of vinyl grafted modified chitosan, 10 parts of a photoinitiator, 8 parts of vinyl indole, 20 parts of an active diluent, 10 parts of a rare earth oxide, and 40 parts of a solvent;

[0069] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 3; the photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 3:1; the vinyl indole is obtained by mixing 5-vinyl indole-1-carboxylic acid tert-butyl ester and 6-vinyl-1H-indole in a mass ratio of 1:1; the active diluent is neopentyl glycol diacrylate and dipropylene glycol diacrylate; the rare earth oxide is obtained by mixing nano cerium oxide and nano yttrium oxide in a mass ratio of 1:1; the solvent is ethyl acetate;

[0070] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0071] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0072] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0073] Embodiment 4:

[0074] Example 4 is different from Example 1 only in that the vinyl grafted modified chitosan is prepared by Preparation Example 4, specifically as follows:

[0075] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0076] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 4; the photoinitiator is prepared by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0077] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0078] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0079] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0080] Embodiment 5:

[0081] Example 5 is different from Example 1 only in that the vinyl grafted modified chitosan is prepared by Preparation Example 5, specifically as follows:

[0082] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0083] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 5; the photoinitiator is prepared by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzidonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0084] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0085] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0086] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0087] Embodiment 6:

[0088] Example 6 is different from Example 1 only in that the vinyl indole is 6-vinyl-1H-indole, specifically as follows:

[0089] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0090] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is prepared by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is 6-vinyl-1H-indole; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0091] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0092] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0093] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0094] Embodiment 7:

[0095] Example 7 is different from Example 1 only in that vinyl indole is obtained by mixing tert-butyl 5-vinyl indole-1-carboxylate and 6-vinyl-1H-indole in a mass ratio of 1:1, as follows:

[0096] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0097] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is obtained by mixing 5-vinyl indole-1-carboxylic acid tert-butyl ester and 6-vinyl-1H-indole in a mass ratio of 1:1; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0098] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0099] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0100] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0101] In order to verify the performance of the UV-curable high-performance pressure-sensitive adhesive tapes obtained in Examples 1-7 of the present invention, the present invention sets up Comparative Examples 1-4.

[0102] Comparative Example 1:

[0103] Comparative Example 1 is different from Example 1 only in that the vinyl grafted chitosan is replaced with an equal mass of carboxymethyl chitosan, as follows:

[0104] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of carboxymethyl chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0105] The photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0106] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0107] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, carboxymethyl chitosan, vinyl indole, a photoinitiator, an active diluent, a solvent, and a rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0108] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0109] Comparative Example 2:

[0110] Comparative Example 2 is different from Example 1 only in that the photoinitiator is only o-chlorohexaarylbisimidazole, specifically as follows:

[0111] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0112] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is only o-chlorohexaarylbisimidazole; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0113] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0114] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0115] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0116] Comparative Example 3:

[0117] Comparative Example 3 is different from Example 1 only in that the photoinitiator is only (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate, specifically as follows:

[0118] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 5 parts of a photoinitiator, 8 parts of vinyl indole, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0119] Wherein, the vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is only (4-octyloxyphenyl) benzyl iodonium hexafluoroantimonate; the vinyl indole is tert-butyl 5-vinyl indole-1-carboxylate; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0120] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0121] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0122] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0123] Comparative Example 4:

[0124] Comparative Example 4 is different from Example 1 only in that vinyl indole is not added, and the details are as follows:

[0125] A UV-curable high-performance pressure-sensitive adhesive tape, comprising a PET release film, a pressure-sensitive adhesive and a blue PVC substrate film; the pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100 parts of polyethylene glycol acrylate, 10 parts of isobornyl acrylate, 30 parts of pentaerythritol triacrylate, 20 parts of dithiodiphenyl sulfide, 5 parts of vinyl grafted modified chitosan, 2 parts of a photoinitiator, 10 parts of an active diluent, 1 part of a rare earth oxide, and 20 parts of a solvent;

[0126] The vinyl grafted modified chitosan is prepared by Preparation Example 1; the photoinitiator is prepared by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2:3; the active diluent is ethylene glycol dimethacrylate; the rare earth oxide is nano-lanthanum oxide; and the solvent is acetone;

[0127] A method for preparing a UV-curable high-performance pressure-sensitive adhesive tape comprises the following steps:

[0128] According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive;

[0129] The pressure-sensitive adhesive was coated on a blue PVC substrate film, and a PET release film was attached to the other side, followed by irradiation and curing with a 2000 mj 365 nm UV curing lamp for 20 min to obtain a pressure-sensitive adhesive tape.

[0130] Performance testing:

[0131] The performance of the pressure-sensitive adhesive tapes obtained in Examples 1-7 of the present invention and Comparative Examples 1-4 was tested, and the results are shown in Table 1:

[0132] Refer to GB / T2792-2014 "Test method for peel strength of adhesive tape" to test the peel strength and residual adhesive rate of pressure-sensitive tape;

[0133] Refer to GB / T 33332-2016 "Test method for dynamic shear strength of adhesive tape" to test the shear strength of pressure-sensitive tape and observe the damage type of substrate;

[0134] Refer to GB / T4852-2002 "Test method for initial tack of pressure-sensitive adhesive tapes (rolling ball method)" to test the initial tack of pressure-sensitive adhesive tapes.

[0135] Table 1:

[0136]

[0137] It can be seen from the data shown in Table 1 above that the comprehensive performance of the pressure-sensitive tape obtained in Examples 1-7 is significantly better than that in Comparative Examples 1-4, the initial adhesion, peel strength and shear strength of the pressure-sensitive tape are greatly enhanced, and the residual adhesive rate is less than 0.5%, which fully demonstrates that the pressure-sensitive tape of the present invention can achieve excellent product adhesion, heavy workability and stability, and can be widely used in new energy vehicle batteries.

[0138] It can be seen from Example 1 and Comparative Example 1 that the present invention loads vinyl groups onto carboxymethyl chitosan molecules. Compared with carboxymethyl chitosan molecules, the vinyl grafted modified chitosan can significantly enhance the peel strength of the pressure-sensitive tape, greatly reduce the residual adhesive rate, and greatly improve the shear strength of the pressure-sensitive tape. During the stretching process, no damage to the substrate will occur.

[0139] It can be seen from Example 1 and Comparative Examples 2 and 3 that the o-chlorohexaarylbisimidazole of the present invention is mixed with (4-octyloxyphenyl)benzidonium hexafluoroantimonate, and the two are synergistic, which helps to improve the peel strength and shear strength of the pressure-sensitive adhesive tape and reduce the peeling residual adhesive rate of the pressure-sensitive adhesive tape.

[0140] It can be seen from Example 1 and Comparative Example 4 that the addition of vinyl indole in the present invention is beneficial to improving the adhesive performance and peeling effect of the pressure-sensitive adhesive tape.

[0141] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A UV-curable high-performance pressure-sensitive adhesive tape, characterized in that: It comprises a release film, a pressure-sensitive adhesive and a blue substrate film; one side of the pressure-sensitive adhesive is the release film, and the other side is the blue substrate film; The pressure-sensitive adhesive comprises the following raw materials in parts by weight: 100-200 parts of polyethylene glycol acrylate, 10-30 parts of isobornyl acrylate, 10-30 parts of pentaerythritol triacrylate, 20-40 parts of dithiodiphenyl sulfide, 5-10 parts of vinyl grafted modified chitosan, 5-10 parts of photoinitiator, 4-8 parts of vinyl indole, 10-20 parts of active diluent, 1-10 parts of rare earth oxide, and 20-40 parts of solvent; The photoinitiator is obtained by mixing o-chlorohexaarylbisimidazole and (4-octyloxyphenyl)benzeniodonium hexafluoroantimonate in a mass ratio of 2-9:3; The vinyl indole is 5-vinyl indole-1-carboxylic acid tert-butyl ester and / or 6-vinyl-1H-indole.

2. The UV-curable high-performance pressure-sensitive adhesive tape according to claim 1, characterized in that: The vinyl grafted modified chitosan is prepared by the following method: Dissolve carboxymethyl chitosan and vinyl-containing silane coupling agent in water, adjust the pH value to 1-2 with hydrochloric acid, and stir the reaction at 40-50°C for 8-12 hours; when the reaction is finished, add triethanolamine to adjust the pH value to neutral, let it stand at 1-5°C for 1-2 hours, rotary evaporate, and dry to obtain vinyl-grafted modified chitosan.

3. The UV-curable high-performance pressure-sensitive adhesive tape according to claim 2, characterized in that: The vinyl-containing silane coupling agent is at least one of vinyl trimethoxysilane, vinyl triethoxysilane, methyl vinyl diethoxysilane, vinyl triisopropoxysilane, methacryloxypropyl trimethoxysilane and methacryloxypropyl triethoxysilane.

4. The UV-curable high-performance pressure-sensitive adhesive tape according to claim 3, characterized in that: The mass ratio of the carboxymethyl chitosan, the vinyl-containing silane coupling agent and water is 20-30:7-10:

100.

5. The UV-curable high-performance pressure-sensitive adhesive tape according to claim 1, characterized in that: The active diluent is at least one of ethylene glycol dimethacrylate, tripropylene glycol diacrylate, neopentyl glycol diacrylate and dipropylene glycol diacrylate.

6. The UV-curable high-performance pressure-sensitive adhesive tape according to claim 1, characterized in that: The rare earth oxide is at least one of nano-lanthanum oxide, nano-cerium oxide, and nano-yttrium oxide; The solvent is at least one of acetone, butanone, methanol, isopropanol, ethyl acetate and toluene.

7. A method for preparing the UV-curable high-performance pressure-sensitive adhesive tape according to any one of claims 1 to 6, characterized in that: The following steps are involved: According to the formula, polyethylene glycol acrylate, isobornyl acrylate, pentaerythritol triacrylate, dithiodiphenyl sulfide, vinyl grafted modified chitosan, vinyl indole, photoinitiator, active diluent, solvent and rare earth oxide are uniformly mixed to obtain a pressure-sensitive adhesive; The pressure-sensitive adhesive is coated on a blue substrate film, a release film is attached to the other side, and the film is cured by irradiation with a UV curing lamp to obtain a pressure-sensitive adhesive tape.

8. An application of the UV-curable high-performance pressure-sensitive adhesive tape according to any one of claims 1 to 6, characterized in that: The pressure-sensitive adhesive tape is used as a blue film adhesive tape and is applied to new energy vehicle batteries.

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