Reusable high-temperature viscosity-reducing adhesive tape and preparation method thereof

Abstract

The invention discloses a reusable high-temperature viscosity-reducing adhesive tape and a preparation method thereof, and belongs to the technical field of adhesive tapes, and the preparation method comprises the following steps: firstly, mixing 1, 10-decanediol diacrylate, acrylic acid, glyceryl methacrylate, an initiator and acetone, and carrying out polymerization reaction in a nitrogen environment to obtain a pretreated mixture; secondly, polydipentaerythritol pentaacrylate, N, N-bis (2, 3-epoxypropyl) cyclohexylamine and an initiator are added, and a post-treatment mixture is formed; then adding pentaerythritol tri (3-aziridinyl) propionate as a cross-linking agent, and stirring to obtain a high-temperature viscosity reducer; and finally, coating the PP film with a high-temperature viscosity reducer, coating the other surface with the high-temperature viscosity reducer to form a grid pattern, curing in an oven, and covering with a release film to obtain a final product. Compared with the prior art, the adhesive tape has good viscosity at normal temperature, the viscosity is reduced at high temperature, and the adhesive tape is easy to strip, can be repeatedly used and is suitable for various industrial applications, the production efficiency is effectively improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tapes, and in particular to a reusable high-temperature adhesive tape and a preparation method thereof. Background Art

[0002] In modern industrial production, especially in the fields of electronics, automobiles, aerospace, etc., high temperature adhesive tape is widely used in various high temperature processes as an important auxiliary material. This tape can provide temporary bonding, protect lamination, fix electronic components, etc., and can be easily removed when not needed without leaving any residual adhesive. With the development of industrial technology, the performance requirements for high temperature adhesive tape are getting higher and higher, especially in terms of room temperature peeling force, reusability and adhesive reduction performance at high temperature.

[0003] In the prior art, for example, a high-temperature viscosity-reducing tape disclosed in Chinese invention patent CN109266236A can achieve viscosity-reducing effect at high temperature, but performs poorly in terms of peeling force and repeatability at room temperature. This tape usually comprises a substrate film and a high-temperature viscosity-reducing polyacrylate pressure-sensitive adhesive coated thereon. However, this type of tape will further cross-link at high temperature, resulting in a significant decrease in peeling force. Although it is easy to peel, it also affects the adhesive stability and reusability of the tape.

[0004] In addition, after the high-temperature process, the existing high-temperature anti-viscosity tape is prone to bubbling due to the failure to promptly remove the gas that may exist inside the adhesive layer. This not only affects the bonding effect of the tape, but also limits the reuse of the tape, increases production costs, and reduces work efficiency. Summary of the invention

[0005] In view of the above problems, the present invention aims to provide a novel reusable high-temperature viscosity-reducing tape and a preparation method thereof, so as to solve the above problems and improve the room-temperature peeling force, reusability and viscosity-reducing effect of the tape at high temperatures.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A method for preparing a reusable high-temperature adhesive tape is as follows, in parts by weight: Step 1, 70-90 parts of 1,10-decanediol diacrylate, 10-20 parts of acrylic acid, 1-3 parts of glyceryl methacrylate, 0.2-0.4 parts of initiator and 80-120 parts of acetone are mixed, and the temperature is adjusted to react under a nitrogen environment. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pre-treated mixture; Step 2: Take 70-90 parts of the pre-treatment mixture prepared in step 1, add 10-15 parts of polydipentaerythritol pentaacrylate, 0.1-0.3 parts of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.05-0.2 parts of initiator, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.5 to 1 part of a cross-linking agent to the post-treatment mixture prepared in step 2, and continuously stirring for 10 to 30 minutes to obtain a high-temperature viscosity reducing agent; Step 4: evenly apply the high-temperature viscosity-reducing agent on one surface of the PP film, and apply the high-temperature viscosity-reducing agent on the other surface to form a grid pattern, and solidify it in an oven. After drying, the two sides are covered with release films to obtain a high-temperature viscosity-reducing tape.

[0007] The initiator is at least one of azobisisobutyronitrile and dibenzoyl peroxide.

[0008] The temperature adjustment for the reaction is to control the temperature at 50-70°C for a preliminary reaction for 3-5 hours, then increase the temperature to 70-80°C for a continuous reaction for 1-3 hours, and finally complete the reaction at 75-85°C for 2-4 hours.

[0009] The cross-linking agent is pentaerythritol tris (3-aziridinyl) propionate.

[0010] The thickness of the PP film is 30-50 μm.

[0011] The curing temperature is increased to 80-100° C. at a rate of 8-12° C. / min, and then decreased to room temperature at a rate of 8-12° C. / min.

[0012] The total coating dry weight is 30-40 g / m 2 .

[0013] The release film has a thickness of 10-30 μm and is made of PET.

[0014] In the present invention, the functions of each substance are as follows: 1,10-Decanediol diacrylate is the main component, which helps to form the main structure of the tape and provides good bonding performance and cohesion.

[0015] Acrylic acid is used as a copolymer monomer. Acrylic acid can increase the viscosity of the tape and participate in the cross-linking reaction through its carboxyl group to improve the cohesive strength of the tape.

[0016] Glyceryl methacrylate as a comonomer helps improve the adhesive properties and flexibility of the tape, while the glyceride group may help improve the water resistance and chemical resistance of the tape.

[0017] The initiator (azobisisobutyronitrile or dibenzoyl peroxide) plays a starting role in the polymerization reaction, generating free radicals to initiate the polymerization of monomers and form a polymer network.

[0018] Acetone is used as a solvent. Acetone helps to evenly mix the various components in the reactants and control the viscosity during the reaction.

[0019] Polydipentaerythritol pentaacrylate is used as a crosslinking agent, which increases the crosslinking density of the tape, thereby improving the cohesion and bonding strength of the tape.

[0020] N,N-di(2,3-epoxypropyl)cyclohexylamine may act as a curing agent to form a three-dimensional network structure and enhance the adhesive properties of the tape.

[0021] Pentaerythritol tris(3-aziridinyl) propionate is used as a cross-linking agent, which promotes the tape's viscosity reduction at high temperatures and helps restore the tape's viscosity at room temperature to achieve repeated use.

[0022] PP film is used as a substrate to provide the tape with physical form and certain mechanical strength, and its thickness affects the flexibility and durability of the tape.

[0023] Release film covers both sides of the tape, preventing it from sticking during storage and transportation, while allowing for easy peeling during application.

[0024] The combination and interaction of these substances make the high-temperature viscosity-reducing adhesive tape of the present invention have excellent adhesive properties, viscosity-reducing properties at high temperatures and the ability to be reused.

[0025] Compared with the prior art, it has the following beneficial effects: 1) The high-temperature viscosity-reducing tape of the present invention exhibits better peeling force at room temperature. At the same time, the repeatability of the tape is significantly improved, which indicates that the tape can still maintain good bonding performance after multiple uses, thereby improving the service life and economy of the tape.

[0026] 2) The adhesive tape of the present invention can quickly reduce its viscosity under high temperature conditions, making the tape easy to remove without leaving residual adhesive, which is very useful in high-temperature processes. When the temperature drops to room temperature, the adhesive tape can recover its viscosity, allowing the tape to be reused, which not only improves production efficiency but also reduces resource waste.

[0027] 3) The present invention applies a high-temperature viscosity reducing agent on one side of the tape and a high-temperature viscosity reducing agent on the other side to form a grid pattern. The tape of the present invention can effectively remove gas at high temperatures to avoid bubbling. This grid adhesive process allows the tape to be easily separated from the adhered object after use at high temperatures, and does not affect the reuse of the tape, thereby enhancing the practicality and reliability of the tape. DETAILED DESCRIPTION

[0028] Main sources of substances: Polydipentaerythritol pentaacrylate, CAS No.: 60506-81-2, brand: PETA, molecular weight: 578, Wuhan Kemik Biopharmaceutical Technology Co., Ltd.

[0029] Pentaerythritol tris(3-aziridinyl)propionate, CAS number: 57116-45-7.

[0030] 2,2-Bis(hydroxymethyl)-1,3-propanediyl diacrylate, CAS No.: 85614-76-2, molecular weight: 244.24.

[0031] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0032] The design idea of ​​the present invention is to provide a new type of reusable high-temperature viscosity-reducing tape and its preparation method in view of the deficiencies of the high-temperature viscosity-reducing tape in the prior art in terms of peeling force and repeatability at room temperature. By carefully selecting and combining different monomers, initiators, cross-linking agents and specific reaction conditions, a tape that can effectively reduce viscosity at high temperatures and maintain good bonding properties at room temperature is invented. 1,10-decanediol diacrylate, acrylic acid, methacrylate glyceride are used as comonomers, and pentaerythritol tris (3-aziridinyl) propionate is used as a cross-linking agent. The synergistic effect of these components plays a key role in the bonding performance and cohesion of the tape. In addition, by coating a high-temperature viscosity-reducing agent on one side of the tape and a high-temperature viscosity-reducing agent on the other side to form a grid pattern, the tape can be timely discharged at high temperatures to avoid bubbling, thereby realizing the reuse of the tape, improving the practicality and economy of the tape, and also saving resources.

[0033] Example 1 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and cure it in an oven. The temperature is increased to 90°C at 10°C / min, and then decreased to room temperature at 10°C / min. The total dry coating weight is 35g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0034] Example 2 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80g of isostearyl acrylate, 15g of acrylic acid, 2g of methacrylate glycerol, 0.3g of azobisisobutyronitrile and 100g of acetone are mixed in a reaction container, and the temperature is controlled at 60°C for a preliminary reaction for 4 hours under a nitrogen environment, then the temperature is raised to 75°C for a further reaction for 2 hours, and finally the reaction is completed at 80°C for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and cure it in an oven. The temperature is increased to 90°C at 10°C / min, and then decreased to room temperature at 10°C / min. The total dry coating weight is 35g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0035] Example 3 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of pentaerythritol tetraacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0036] Example 4 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of 2,2-bis(hydroxymethyl)-1,3-propanediyl diacrylate, 0.2 g of N,N-bis(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0037] Example 5 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3: Add 0.8 g of trimethylolpropane tris(3-aziridinyl propionate) to the post-treatment mixture prepared in step 2, and continue stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0038] Comparative Example 1 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80g of isooctyl acrylate, 15g of acrylic acid, 2g of methacrylate glycerol, 0.3g of azobisisobutyronitrile and 100g of acetone are mixed in a reaction container, and the temperature is controlled at 60°C for 4 hours under a nitrogen environment, and then the temperature is raised to 75°C for further reaction for 2 hours, and finally the reaction is completed at 80°C for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pre-treated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0039] Comparative Example 2 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of hydroxyethyl methacrylate, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0040] Comparative Example 3 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of pentaerythritol triacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of pentaerythritol tris (3-aziridinyl) propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0041] Comparative Example 4 A method for preparing a reusable high temperature adhesive tape is as follows: Step 1, 80 g of 1,10-decanediol diacrylate, 15 g of acrylic acid, 2 g of methacrylate glycerol, 0.3 g of azobisisobutyronitrile and 100 g of acetone are mixed in a reaction container, and the temperature is controlled at 60° C. for a preliminary reaction for 4 hours under a nitrogen environment, and then the temperature is raised to 75° C. for a further reaction for 2 hours, and finally the reaction is completed at 80° C. for 3 hours. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pretreated mixture; Step 2: Take 80 g of the pre-treatment mixture prepared in step 1, add 12 g of polydipentaerythritol pentaacrylate, 0.2 g of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.1 g of dibenzoyl peroxide, and mix thoroughly to form a uniform post-treatment mixture; Step 3, adding 0.8 g of trimethylolpropane-tris[3-(2-methylaziridinyl)]propionate to the post-treatment mixture prepared in step 2, and stirring for 20 minutes to obtain a high-temperature viscosity reducing agent; Step 4: Evenly apply the high-temperature viscosity reducing agent on one surface of the 40 μm thick PP film, and apply the high-temperature viscosity reducing agent on the other surface to form a grid pattern, and solidify it in an oven. The temperature is increased to 90°C with a 10-grid pattern, and then decreased to room temperature with a 10-grid pattern. The total dry coating weight is 35 g / m 2 After drying, both sides are covered with release films, the thickness of the release films is 20 μm, and the material is PET, to obtain a high-temperature anti-viscosity tape.

[0042] Test Example 1 Peel force test According to GB / T 2792-2014 "Test method for peel strength of adhesive tape", the performance of the high temperature viscosity-reducing tapes prepared in Examples 1 to 5 and Comparative Examples 1 to 4 was tested. The test surface was a grid pattern surface. Test condition (1) was the peel strength against a stainless steel plate at room temperature, with a bonding area of ​​10×2.54 cm. Test condition (2) was the peel strength against a stainless steel plate at 90°C, with a bonding area of ​​10×2.54 cm. Specific test data are shown in Table 1.

[0043] Table 1 Test Example 2 Repeatability test The high-temperature viscosity-reducing tapes prepared in Examples 1 to 5 of the present invention and Comparative Examples 1 to 4 were attached to a stainless steel plate at room temperature and peeled off at 90° C. This was repeated three times. The test surface was a grid pattern surface. The room-temperature peeling force on the stainless steel plate was tested again. The bonding area was 10×2.54 cm. The reduction rate was calculated. The test results are shown in Table 2.

[0044] Table 2 It can be seen from the data of test examples 1 and 2 that the high temperature viscosity-reducing tape prepared in Example 1 has the best room temperature peeling force and repeatability.

[0045] In Example 1 of the present invention, 1,10-decanediol diacrylate is used as the main cross-linking agent, and it exhibits better room temperature peeling force and repeatability than isooctadecyl acrylate in Example 2 and isooctyl acrylate in Comparative Example 1. From the perspective of molecular structure, 1,10-decanediol diacrylate has two acrylate groups, which enables it to form more cross-linking points during the cross-linking process, thereby enhancing the cohesion and bonding performance of the tape. In addition, the molecular chain of 1,10-decanediol diacrylate is longer, which helps to form a stronger adhesion between the tape and the adherend and improve the bonding strength of the tape. In contrast, although isooctadecyl acrylate and isooctyl acrylate also contain acrylate groups, their molecular chains are shorter, and the cross-linked network formed during the cross-linking process may be less dense and stable than that of 1,10-decanediol diacrylate due to different substitution groups in their molecular structures. This may be the reason why the tape of Example 1 performs better in room temperature peeling force and repeatability tests.

[0046] In Example 1 of the present invention, glyceryl methacrylate is used as a comonomer, and better room temperature peeling force and repeatability are shown compared with hydroxyethyl methacrylate used in Comparative Example 2. From the perspective of molecular structure, glyceryl methacrylate has two hydroxyl groups, which may help to form more hydrogen bonds between polymer chains, thereby enhancing the cohesion and bonding performance of the tape. In addition, the molecular structure of glyceryl methacrylate may help to form a stronger adhesion between the tape and the adherend, thereby improving the bonding strength of the tape. In contrast, although hydroxyethyl methacrylate also contains hydroxyl groups, it has only one hydroxyl group in its molecule and may form fewer hydrogen bonds, which may be the reason why its bonding performance is not as good as glyceryl methacrylate.

[0047] In Example 1 of the present invention, polydipentaerythritol pentaacrylate is used as a crosslinking agent, which shows better room temperature peeling force and repeatability than pentaerythritol tetraacrylate in Example 3, 2,2-di(hydroxymethyl)-1,3-propanediyl diacrylate in Example 4, and pentaerythritol triacrylate in Comparative Example 3. From the perspective of molecular structure, polydipentaerythritol pentaacrylate may have specific functional groups or molecular structures, which enables it to form a more stable or more effective crosslinking network during the crosslinking process. This structure may help to improve the adhesive performance and cohesion of the tape, thereby performing better in peeling force and repeatability tests. Although pentaerythritol tetraacrylate and pentaerythritol triacrylate also provide crosslinking, their molecular structures may not be as good as polydipentaerythritol pentaacrylate in terms of crosslinking density or compatibility with the substrate, which may affect the adhesive performance of the tape. The structure of 2,2-bis(hydroxymethyl)-1,3-propanediyl diacrylate may differ in crosslinking efficiency or compatibility with other components, which may also lead to its deficiencies in adhesive tape performance.

[0048] In Example 1 of the present invention, pentaerythritol tris (3-aziridinyl) propionate is used as a cross-linking agent, and compared with trimethylolpropane tris (3-aziridinyl propionate) in Example 5 and trimethylolpropane-tris [3- (2-methylaziridinyl)] propionate in Comparative Example 4, it shows better room temperature peeling force, repeatability and lower peeling force at 90°C. This may be related to the molecular structure of pentaerythritol tris (3-aziridinyl) propionate, which has a long molecular chain and no large side chains, which helps to form a more stable and uniform adhesive layer structure after cross-linking. Pentaerythritol tris (3-aziridinyl) propionate can undergo a ring-opening reaction with carboxyl groups at room temperature to generate ester groups and amino groups, which help to improve the cohesive strength and bonding properties of the tape. At a high temperature of 90°C, the rotation of the molecular chain segments and the formation of hydrogen bonds cause the adhesive layer to shrink and harden at high temperatures, inactivate the viscosity, and be easy to remove. When the temperature returns to room temperature, the rotation of the molecular chain segments is partially restored, the hydrogen bonds fail, and the adhesive layer's viscosity is restored, thus enabling the tape to be reused. In contrast, trimethylolpropane tris(3-aziridinyl propionate) and trimethylolpropane-tris[3-(2-methylaziridinyl)]propionate may not perform as well as pentaerythritol tris(3-aziridinyl)propionate at 90°C due to the presence of side chains or different functional groups in their molecular structures.

Claims

1. A method for preparing a reusable high-temperature adhesive tape, characterized in that: The method is as follows, in parts by weight: Step 1, 70-90 parts of 1,10-decanediol diacrylate, 10-20 parts of acrylic acid, 1-3 parts of glyceryl methacrylate, 0.2-0.4 parts of initiator and 80-120 parts of acetone are mixed, and the temperature is adjusted to react under a nitrogen environment. After the reaction is completed, the system is allowed to cool naturally to ambient temperature to obtain a pre-treated mixture; Step 2: Take 70-90 parts of the pre-treatment mixture prepared in step 1, add 10-15 parts of polydipentaerythritol pentaacrylate, 0.1-0.3 parts of N,N-di(2,3-epoxypropyl)cyclohexylamine and 0.05-0.2 parts of initiator, and mix thoroughly to form a uniform post-treatment mixture; Step 3: Add 0.5 to 1 part of a cross-linking agent to the post-treatment mixture prepared in step 2, and continue stirring for 10 to 30 minutes to obtain a high-temperature viscosity reducing agent; Step 4: evenly apply the high-temperature viscosity-reducing agent on one surface of the PP film, and apply the high-temperature viscosity-reducing agent on the other surface to form a grid pattern, and solidify it in an oven. After drying, the two sides are covered with release films to obtain a high-temperature viscosity-reducing tape.

2. The method for preparing a reusable high-temperature viscosity-reducing tape according to claim 1, characterized in that: The initiator is at least one of azobisisobutyronitrile and dibenzoyl peroxide.

3. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The temperature adjustment for the reaction is to control the temperature at 50-70°C for a preliminary reaction for 3-5 hours, then increase the temperature to 70-80°C for a further reaction for 1-3 hours, and finally complete the reaction at 75-85°C for 2-4 hours.

4. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The cross-linking agent is pentaerythritol tris (3-aziridinyl) propionate.

5. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The thickness of the PP film is 30-50 μm.

6. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The curing temperature is increased to 80-100° C. at a rate of 8-12° C. / min, and then decreased to room temperature at a rate of 8-12° C. / min.

7. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The total coating dry weight is 30-40 g / m 2 .

8. The method for preparing a reusable high temperature viscosity-reducing tape according to claim 1, characterized in that: The release film has a thickness of 10-30 μm and is made of PET.

9. A reusable high temperature adhesive tape, characterized in that: The method is prepared according to any one of claims 1 to 8.

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