Self-initiation type migration-free UV viscosity-reducing adhesive and preparation method thereof

Abstract

The invention discloses a self-initiation type migration-free UV viscosity-reducing adhesive and a preparation method thereof, which are applied to the field of photocuring adhesives. The preparation method comprises the following steps: preparing a self-initiated copolymer from an acrylate soft monomer, an acrylate hard monomer, an acrylate functional monomer, glycidyl methacrylate, 4-acryloyloxybenzophenone and dimethylaminoethyl acrylate according to a certain ratio by adopting a solution copolymerization method; after UV irradiation is carried out on a pressure-sensitive adhesive tape of a bonding base material, tertiary amine groups on the side chain and benzophenone can co-initiate vinyl free radical polymerization, rapid crosslinking is carried out in a system, and then the stripping force is reduced; the problems that after a traditional UV viscosity-reducing adhesive is pasted for a long time, adhesive residues are prone to occurring, UV components are lost, stripping is difficult, and a base material is difficult to etch are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of photocurable adhesives, and in particular to a self-initiating, non-migrating UV-resistant adhesive and its preparation method. Background Technology

[0002] During chip fabrication, cutting is required. Since the debris generated during cutting can damage the chip's surface structure, leading to chip failure, a protective film needs to be applied to the cut surface. This protective film must exhibit good adhesion to the silicon substrate during chip cutting, but it must also be easily peeled off after cutting without leaving residue or allowing small molecules to migrate, thus preventing damage to the integrated circuits on the chip.

[0003] To address this requirement, some researchers have proposed UV-resistant adhesive solutions. For example, existing technologies disclose CN116410670B a UV adhesive composition, a UV-resistant adhesive, and a UV-resistant film, and CN114644900B a UV-resistant adhesive composition, a UV-resistant tape, and a method for preparing the UV-resistant tape. Therefore, most commercially available UV-resistant adhesives currently utilize a pressure-sensitive adhesive / high-functionality polyurethane acrylate composite system. Before UV treatment, the pressure-sensitive adhesive component provides adhesion between the protective film and the substrate, while the UV component acts as a plasticizer, improving overall bond strength and initial tack. After UV treatment, the high-functionality UV component rapidly undergoes free radical polymerization, generating a cross-linked network structure and significantly increasing the glass transition temperature of the pressure-sensitive adhesive, causing a rapid decrease in its bond strength.

[0004] However, this solution still has some problems that need to be solved. During long-term bonding, the unreacted polyurethane acrylate in the system may migrate to the silicon wafer surface. Since the silicon wafer is not completely flat, if it migrates to the recesses and is then exposed to UV light, it will form a "clamping" structure with the chip, thus making it impossible to reduce the peel force. At the same time, since urethane has a certain polarity, the unreacted polyurethane acrylate in the pressure-sensitive adhesive may corrode the chip surface coating during long-term bonding, thus leading to chip failure. Therefore, there is an urgent need to develop a low-tack adhesive with high bonding strength and high initial tack before curing, and easy peeling and no migration after UV treatment, to meet market demand. Summary of the Invention

[0005] 1. Technical problems to be solved The core of this invention lies in solving the problems of easy residue, UV component loss, difficulty in peeling, and substrate etching of existing UV-resistant adhesives after long-term application through self-initiated modification and acrylic grafting modification.

[0006] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0007] A self-initiated, migration-free UV adhesive and its preparation method are disclosed. The adhesive comprises a self-initiated acrylate copolymer, acrylic acid, and triphenylphosphine. The self-initiated acrylate copolymer comprises the following raw materials in parts by weight: 75-80 parts of soft acrylate monomer, 5-8 parts of hard acrylate monomer, 0.5-2 parts of functional acrylate monomer, 10-15 parts of glycidyl methacrylate, 1-5 parts of 4-acryloyloxybenzophenone, 4-8 parts of dimethylamine ethyl acrylate, 0.1-0.2 parts of benzoyl peroxide, 0.1 parts of chain transfer agent, and 100 parts of toluene.

[0008] Furthermore, the acrylate soft monomer is one or a combination of at least two of hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, octadecyl acrylate, and lauryl acrylate.

[0009] Furthermore, the acrylate hard monomer is one or a combination of at least two of methyl acrylate, methyl methacrylate, isobornyl acrylate, and isobornyl methacrylate.

[0010] Furthermore, the acrylate functional monomer is one or a combination of at least two of vinyl acetate, acrylonitrile, and diacetone acrylamide.

[0011] The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix and stir the soft acrylate monomer, hard acrylate monomer, functional acrylate monomer, glycidyl methacrylate, 4-acryloyloxybenzophenone, dimethylamine ethyl acrylate, benzoyl peroxide and toluene solution. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, the chain transfer agent is added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial tack before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are tested.

[0012] 3. Beneficial Effects Compared with the prior art, the advantages of this invention are: (1) Self-initiated: No need to add small molecule photosensitizers and tertiary amine co-initiators, effectively solving the problem of small molecules migrating to the silicon wafer after long-term bonding.

[0013] (2) Before UV, the bonding strength is high and the initial adhesion is high. The glass transition temperature of the adhesive layer before UV is -40℃, which has a good wetting effect and can form a strong hydrogen bond with oxygen atoms on the silicon wafer. It is easy to peel off after UV and there is no adhesive residue. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the preparation process of the present invention. Detailed Implementation

[0015] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0016] A self-initiated, migration-free UV adhesive and its preparation method are disclosed. The adhesive comprises a self-initiated acrylate copolymer, acrylic acid, and triphenylphosphine. The self-initiated acrylate copolymer comprises the following raw materials in parts by weight: 75-80 parts of soft acrylate monomer, 5-8 parts of hard acrylate monomer, 0.5-2 parts of functional acrylate monomer, 10-15 parts of glycidyl methacrylate, 1-5 parts of 4-acryloyloxybenzophenone, 4-8 parts of dimethylamine ethyl acrylate, 0.1-0.2 parts of benzoyl peroxide, 0.1 parts of chain transfer agent, and 100 parts of toluene. The acrylate soft monomer is one or a combination of at least two of the following: hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, octadecyl acrylate, and lauryl acrylate; The acrylate hard monomer is one or a combination of at least two of methyl acrylate, methyl methacrylate, isobornyl acrylate, and isobornyl methacrylate; The acrylate functional monomer is one or a combination of at least two of vinyl acetate, acrylonitrile, and diacetone acrylamide; Please see Figure 1 The preparation method of self-initiated non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix and stir the soft acrylate monomer, hard acrylate monomer, functional acrylate monomer, glycidyl methacrylate, 4-acryloyloxybenzophenone, dimethylamine ethyl acrylate, benzoyl peroxide and toluene solution. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, the chain transfer agent is added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial tack before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are tested.

[0017] Example 1: The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix 60 parts of isooctyl acrylate, 15 parts of hydroxyethyl acrylate, 2.7 parts of isobornyl acrylate, 2.3 parts of methyl acrylate, 0.5 parts of vinyl acetate, 15 parts of glycidyl methacrylate, 1 part of 4-acryloyloxybenzophenone, 4 parts of dimethylamine ethyl acrylate, 0.1 parts of benzoyl peroxide and 100 parts of toluene and stir. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, 0.1 parts of chain transfer agent are added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial ring adhesion before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are also tested. The prepared self-initiated, non-migrating UV-resistant adhesive was tested as follows: 1. Peel strength before UV bonding was tested according to GB / T2790-1995 standard, and the result was 21.5N with no residue; 2. Initial ring tack before UV bonding was tested according to GB / T31125-2014 standard, and the result was 12.3N; 3. After 30 days of bonding, peel strength after UV bonding was tested according to GB / T2790-1995 standard, and the result was 188gf with no residue.

[0018] Example 2: The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix 60 parts of isooctyl acrylate, 15 parts of hydroxyethyl acrylate, 2.7 parts of isobornyl acrylate, 2.3 parts of methyl acrylate, 0.5 parts of vinyl acetate, 15 parts of glycidyl methacrylate, 2 parts of 4-acryloyloxybenzophenone, 5 parts of dimethylamine ethyl acrylate, 0.1 parts of benzoyl peroxide and 100 parts of toluene and stir. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, 0.1 parts of chain transfer agent are added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial ring adhesion before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are also tested. The prepared self-initiated, non-migrating UV-resistant adhesive was tested as follows: 1. Peel strength before UV bonding was tested according to GB / T2790-1995 standard, and the result was 21.3 N, with no adhesive residue; 2. Initial ring tack before UV bonding was tested according to GB / T31125-2014 standard, and the result was 13.9 N; 3. After 30 days of bonding, peel strength after UV bonding was tested according to GB / T2790-1995 standard, and the result was 148 gf, with no adhesive residue.

[0019] Example 3: The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix 60 parts of isooctyl acrylate, 15 parts of hydroxyethyl acrylate, 2.7 parts of isobornyl acrylate, 2.3 parts of methyl acrylate, 0.5 parts of vinyl acetate, 15 parts of glycidyl methacrylate, 3 parts of 4-acryloyloxybenzophenone, 6 parts of dimethylamine ethyl acrylate, 0.1 parts of benzoyl peroxide and 100 parts of toluene and stir. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, 0.1 parts of chain transfer agent are added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial ring adhesion before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are also tested. The prepared self-initiated, non-migrating UV-resistant adhesive was tested as follows: 1. Peel strength before UV bonding was tested according to GB / T2790-1995 standard, and the result was 20.4 N, with no adhesive residue; 2. Initial ring tack before UV bonding was tested according to GB / T31125-2014 standard, and the result was 14.1 N; 3. After 30 days of bonding, peel strength after UV bonding was tested according to GB / T2790-1995 standard, and the result was 75 gf, with no adhesive residue.

[0020] Example 4: The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix 60 parts of isooctyl acrylate, 15 parts of hydroxyethyl acrylate, 2.7 parts of isobornyl acrylate, 2.3 parts of methyl acrylate, 0.5 parts of vinyl acetate, 15 parts of glycidyl methacrylate, 4 parts of 4-acryloyloxybenzophenone, 7 parts of dimethylamine ethyl acrylate, 0.1 parts of benzoyl peroxide and 100 parts of toluene and stir. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, 0.1 parts of chain transfer agent are added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial ring adhesion before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are also tested. The prepared self-initiated, non-migrating UV-resistant adhesive was tested as follows: 1. Peel strength before UV bonding was tested according to GB / T2790-1995 standard, and the result was 19.7 N with no residue; 2. Initial ring tack before UV bonding was tested according to GB / T31125-2014 standard, and the result was 12.6 N; 3. After 30 days of bonding, peel strength after UV bonding was tested according to GB / T2790-1995 standard, and the result was 72 gf with no residue.

[0021] Example 5: The preparation method of self-initiated, non-migrating UV anti-tack adhesive includes the following steps: S1. Preparation of self-initiated acrylate copolymers, including the following sub-steps: S11. Mix 60 parts of isooctyl acrylate, 15 parts of hydroxyethyl acrylate, 2.7 parts of isobornyl acrylate, 2.3 parts of methyl acrylate, 0.5 parts of vinyl acetate, 15 parts of glycidyl methacrylate, 5 parts of 4-acryloyloxybenzophenone, 8 parts of dimethylamine ethyl acrylate, 0.1 parts of benzoyl peroxide and 100 parts of toluene and stir. S12. After benzoyl peroxide has completely dissolved, take half of it and add it to the flask. At the same time, start heating the oil bath and open the reflux valve. S13. When the oil bath is heated to 80°C, the other half of the mixed liquid is dropped into the flask. After the addition is complete, the reaction is carried out for 3 hours. Then, 0.1 parts of chain transfer agent are added, and the reaction is carried out for another 1 hour to obtain the self-initiated acrylate copolymer. S2. Preparation of self-initiated, migration-free UV-resistant adhesive, including the following sub-steps: S21. Acrylic acid grafting modification of self-initiated acrylate copolymer: The self-initiated acrylate copolymer and acrylic acid were added to a flask at a molar ratio of epoxy group to carboxyl group of 1:1, and then 0.025 parts of triphenylphosphine were added to the flask. S22. Irradiation: The mixture obtained in the above steps is subjected to UV irradiation at a temperature of 115℃ for 6 hours. After irradiation, a self-initiated, non-migrating UV-resistant adhesive with acrylate groups on the side chain can be obtained. S3. Testing: Finally, the adhesive tape is made into a tape with a dry adhesive thickness of 50μm. It is then bonded to a standard steel plate. The 180° peel strength, presence of residual adhesive, and initial ring adhesion before UV testing are tested and recorded. After 30 days, the 180° peel strength and presence of residual adhesive after UV testing are also tested. The prepared self-initiated, non-migrating UV-resistant adhesive was tested as follows: 1. Peel strength before UV bonding was tested according to GB / T2790-1995 standard, and the result was 18.4 N, with no adhesive residue; 2. Initial ring tack before UV bonding was tested according to GB / T31125-2014 standard, and the result was 11.5 N; 3. After 30 days of bonding, peel strength after UV bonding was tested according to GB / T2790-1995 standard, and the result was 70 gf, with no adhesive residue.

[0022] The detection results of embodiments 1 to 5 above are summarized in the following table: UV-resistant 180° peel force N UV pre-ring initial adhesion N 180° peel strength after UV treatment (gf) Residual adhesive before and after UV treatment Example 1 21.5 12.3 188 No residue Example 2 21.3 13.9 148 No residue Example 3 20.4 14.1 75 No residue Example 4 19.7 12.6 72 No residue Example 5 18.4 11.5 70 No residue Additionally, it should be noted that the above-described embodiments are merely descriptions of the preferred additive formulation content of the present invention and are not intended to limit the overall concept and scope of protection of the present invention. The test results show that when other components remain unchanged, when 3 parts of 4-acryloyloxybenzophenone and 6 parts of dimethylamine ethyl acrylate are used, the 180° peel force before UV is 20.4 N, the initial ring tack is 14.1 N, and the 180° peel force after UV is 75 gf, with no residue on the silicone substrate, which is the preferred solution.

[0023] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A self-initiating, non-migratory UV tack-reducing adhesive, characterized in that: The self-initiating acrylic ester copolymer comprises 75-80 parts of acrylic ester soft monomer, 5-8 parts of acrylic ester hard monomer, 0.5-2 parts of acrylic ester functional monomer, 10-15 parts of methacrylate glycidyl ether, 1-5 parts of 4-acryloyloxybenzophenone, 4-8 parts of dimethylaminoethyl acrylate, 0.1-0.2 parts of benzoyl peroxide, 0.1 part of chain transfer agent, and 100 parts of toluene.

2. A self-initiated non-migratory UV tack-reducing adhesive according to claim 1, characterized in that: The acrylic ester soft monomer is one or a combination of at least two of hydroxyethyl acrylate, butyl acrylate, isooctyl acrylate, octadecyl acrylate, and lauryl acrylate.

3. The self-initiated non-migratory UV debonding adhesive according to claim 1, characterized in that: The acrylic ester hard monomer is one or a combination of at least two of methyl acrylate, methyl methacrylate, isobornyl acrylate, and isobornyl methacrylate.

4. The self-initiating non-migratory UV tack-reducing adhesive according to claim 1, characterized in that: The acrylic ester functional monomer is one or a combination of at least two of vinyl acetate, acrylonitrile, and diacetone acrylamide.

5. A process for the preparation of a self-initiated non-migratory UV tack-reducing adhesive characterized by: The preparation method of the self-initiating UV adhesion-reducing adhesive without migration according to any one of claims 1-4 comprises the following steps: S1, preparing the self-initiating acrylic ester copolymer, comprising the following sub-steps: S11, mixing and stirring the acrylic ester soft monomer, acrylic ester hard monomer, acrylic ester functional monomer, methacrylate glycidyl ether, 4-acryloyloxybenzophenone, dimethylaminoethyl acrylate, benzoyl peroxide, and toluene solution; S12, after the benzoyl peroxide is completely dissolved, half of the solution is added to a flask, and the oil bath pot starts to heat up, and the reflux valve is opened; S13, when the oil bath pot is heated to 80℃, the other half of the mixed liquid is added dropwise into the flask, and after the dropwise addition is completed, the reaction is carried out for 3h, then the chain transfer agent is added, and after the reaction is carried out for 1h, the self-initiating acrylic ester copolymer is obtained; S2, preparing the self-initiating UV adhesion-reducing adhesive without migration, comprising the following sub-steps: S21, acrylic graft modification of the self-initiating acrylic ester copolymer: the self-initiating acrylic ester copolymer and acrylic acid are put into a flask according to a molar ratio of epoxy groups to carboxyl groups of 1:1, then 0.025 parts of triphenylphosphine are added to the flask; S22, irradiation: the mixed liquid obtained in the above step is subjected to UV irradiation, the irradiation temperature is 115℃, and the irradiation time is 6h, and after the irradiation is completed, the self-initiating UV adhesion-reducing adhesive without migration with acrylic ester groups in the side chain is obtained; S3, detection: finally, the adhesion-reducing adhesive is made into an adhesive tape, the dry adhesive thickness is 50μm, and the adhesive tape is attached to a standard steel plate, the 180° peeling strength before UV, the presence or absence of residual glue, and the annular initial adhesion are tested and recorded, after being placed for 30 days, the 180° peeling strength after UV, and the presence or absence of residual glue are tested.

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