Durable-adhesion alkali-resistant pressure-sensitive adhesive for battery label and preparation method thereof

Abstract

The invention relates to the technical field of pressure-sensitive adhesives, and provides a persistent-adhesion alkali-resistant pressure-sensitive adhesive for a battery label and a preparation method thereof.The pressure-sensitive adhesive is prepared from, by weight, 50-70 parts of a soft monomer, 10-15 parts of a hard monomer, 6-12 parts of a functional monomer, 0.5-0.8 part of an initiator, 10-20 parts of modified rosin resin, 0.2-0.4 part of a chain transfer agent, 40-60 parts of a solvent and 2-5 parts of a curing agent. The pressure-sensitive adhesive disclosed by the invention has good holding power and alkali resistance in high-temperature and alkaline environments, and meets the long-term use requirement of a battery label in a complex environment.

Description

Technical Field

[0001] This invention belongs to the field of pressure-sensitive adhesive technology, specifically relating to a tack-resistant and alkali-resistant pressure-sensitive adhesive for battery labels and its preparation method. Background Technology

[0002] With the rapid development of battery technology, the application of battery tags is becoming increasingly widespread. Battery tags not only need to provide basic information, but also need to maintain good adhesion performance in complex operating environments. Especially in electric vehicles and energy storage systems, battery tags need to remain stable over long periods of time in high temperature, high humidity, and alkaline environments (such as electrolyte leakage).

[0003] Currently, pressure-sensitive adhesives for battery tags are mainly based on acrylic systems, which have good initial tack and transparency, but insufficient tack and alkali resistance under high temperature and alkaline conditions. Traditional acrylic pressure-sensitive adhesives are prone to creep at high temperatures, resulting in a shortened holding time. At the same time, under alkaline conditions, the ester groups are prone to saponification, leading to a decrease in tack.

[0004] Chinese patent CN 115926692 A discloses a biodegradable water-based acrylic pressure-sensitive adhesive, a biodegradable tape, and a preparation method thereof. The main components of the pressure-sensitive adhesive are soft monomers, hard monomers, functional monomers, biodegradable oligomer monomers, emulsifiers, initiators, and deionized water. The tape of this invention lacks the addition of tackifying resin, resulting in insufficient adhesion of the pressure-sensitive adhesive to the substrate layer and poor tape holding power.

[0005] Therefore, there is an urgent need to develop a tack-holding and alkali-resistant pressure-sensitive adhesive for battery tags. By introducing tackifying resins, the tack-holding and alkali-resistance properties of the pressure-sensitive adhesive can be significantly improved in high-temperature and alkaline environments, thus meeting the long-term use requirements of battery tags in complex environments. Summary of the Invention

[0006] To address the existing technical problems, the present invention aims to provide a pressure-sensitive adhesive for battery tags that is tack-resistant and alkali-resistant, and its preparation method. The pressure-sensitive adhesive of the present invention exhibits excellent tack and alkali resistance under high temperature and alkaline environments, meeting the long-term use requirements of battery tags in complex environments.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] This invention provides an alkali-resistant pressure-sensitive adhesive for battery labels, comprising, by weight, the following raw materials: 50-70 parts of soft monomer, 10-15 parts of hard monomer, 6-12 parts of functional monomer, 0.5-0.8 parts of initiator, 10-20 parts of modified rosin resin, 0.2-0.4 parts of chain transfer agent, 40-60 parts of solvent, and 2-5 parts of curing agent.

[0009] The reaction mechanism and function of this invention are as follows:

[0010] 1. In the pressure-sensitive adhesive of the present invention, acrylic resin is used as the pressure-sensitive adhesive, and polyacrylate resin is synthesized by selecting specific weight parts of soft monomers, hard monomers, functional monomers and modified rosin resin.

[0011] A composition of isooctyl acrylate and / or butyl acrylate is used as a soft monomer. The soft monomer molecular chain is flexible, which is beneficial for improving tack. At the same time, the introduced hard monomer molecular chain is rigid, which is beneficial for improving cohesive force and peel force. By controlling the mass ratio of soft and hard monomers, the prepared acrylic pressure-sensitive adhesive can maintain excellent tack and peel force. Furthermore, this invention selects a specific composition of two monomers as functional monomers, which enables the pressure-sensitive adhesive to maintain good performance and be less susceptible to corrosion when in contact with chemicals or exposed to high-temperature environments.

[0012] 2. The introduction of rosin resin in this invention helps to improve adhesion. However, rosin resin has poor compatibility with acrylic systems and is prone to phase separation, which affects the uniformity and performance of the pressure-sensitive adhesive.

[0013] On the one hand, this invention introduces 2,5-dihydroxybenzoic acid and bisphenol A type epoxy resin, which can react with rosin. The introduced hydroxyl groups can increase the polarity of the resin, enhance its compatibility with acrylic systems, and thus improve the alkali resistance of the pressure-sensitive adhesive. Simultaneously, bisphenol A type epoxy resin has high crosslinking density and good thermal stability, which can significantly increase the resin's softening point and cohesive strength, thereby extending the holding time and improving heat resistance.

[0014] On the other hand, the imidization reaction of N-hydroxyethylpiperazine and maleic anhydride, along with the subsequent introduction of KH-560 and aluminum acetylacetonate, creates abundant crosslinking points, increasing the cohesive strength of the resin, reducing creep, and thus significantly improving tackiness. Simultaneously, the introduction of KH-560 forms a siloxane network on the resin surface, effectively shielding it from alkaline substances, while aluminum acetylacetonate further enhances the resin's alkali resistance.

[0015] In some embodiments, the soft monomer is isooctyl acrylate and / or butyl acrylate.

[0016] In some embodiments, the hard monomer is any one or more of methyl methacrylate, vinyl acetate, and methyl acrylate.

[0017] In some embodiments, the functional monomer is any two of hexafluorobutyl methacrylate, 2-hydroxyethyl acrylate, and glycidyl methacrylate.

[0018] Preferably, the functional monomer is a combination of hexafluorobutyl methacrylate and 2-hydroxyethyl acrylate.

[0019] More preferably, the mass ratio of hexafluorobutyl methacrylate to 2-hydroxyethyl acrylate is (0.3-0.6):1.

[0020] In some embodiments, the method for preparing the modified rosin resin includes the following steps:

[0021] S1. Mix rosin, 2,5-dihydroxybenzoic acid, bisphenol A epoxy resin and catalyst, and heat to 100-115℃ under an inert gas atmosphere for 3-4.5 h to obtain the reactant;

[0022] S2. Mix the reactants obtained in step S1, N-hydroxyethylpiperazine and maleic anhydride, heat to 140-160℃ and react for 2-3 hours, add KH-560 dropwise and keep the temperature for another 0.5-1 hour, then add aluminum acetylacetone to react and obtain modified rosin resin.

[0023] In some embodiments, the mass ratio of rosin to bisphenol A epoxy resin in step S1 is 1:(0.2-0.3).

[0024] In some embodiments, the mass ratio of N-hydroxyethylpiperazine to maleic anhydride in step S2 is 1:(1.2-1.8).

[0025] In some embodiments, the mass ratio of N-hydroxyethylpiperazine and KH-560 in step S2 is 1:(0.5-1).

[0026] In some embodiments, the chain transfer agent is any one or more of mercaptoacetic acid, mercaptopropionic acid, and mercaptoethanol.

[0027] Another aspect of the present invention provides a method for preparing an alkali-resistant pressure-sensitive adhesive for battery tags, comprising the following steps:

[0028] 1. Add the soft monomer, hard monomer, functional monomer and part of the solvent into the reaction vessel, introduce inert gas, heat to 60-70℃, keep the reaction temperature for 30-40 min, add part of the initiator, keep the reaction temperature for 1-2 h, and obtain the reaction intermediate.

[0029] 2. After mixing the modified rosin resin, chain transfer agent, and remaining solvent, add them to the reaction intermediate prepared in step 1. Keep the reaction at 60-70℃ for 40-60 min, add the remaining initiator, raise the temperature to 75-80℃, keep the reaction at 70℃ for 1.5-2 h, cool and discharge the material to obtain polyacrylate resin.

[0030] 3. Mix the polyacrylate resin and curing agent obtained in step 2 and stir to obtain acrylic pressure-sensitive adhesive.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. The pressure-sensitive adhesive of the present invention has good tack and alkali resistance in high temperature and alkaline environments, meeting the long-term use requirements of battery tags in complex environments.

[0033] 2. This invention enhances the compatibility of rosin resin with the acrylic system by introducing 2,5-dihydroxybenzoic acid and bisphenol A type epoxy resin, thereby improving alkali resistance and tack. Simultaneously, the use of N-hydroxyethylpiperazine, maleic anhydride, KH-560, and aluminum acetylacetonate further crosslinks significantly improves cohesive strength, reduces creep, and enhances tack. Furthermore, the siloxane network formed by KH-560 effectively shields against alkaline corrosion, and aluminum acetylacetonate further enhances alkali resistance. Detailed Implementation

[0034] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0035] Each pressure-sensitive adhesive was prepared according to the proportions and preparation methods of the raw materials specified in the following examples and comparative examples.

[0036] To facilitate implementation of this invention by those skilled in the art, the manufacturers of some raw materials for the embodiments and comparative examples are described below:

[0037] Bisphenol A type epoxy resin: model E-51;

[0038] Disproportionated rosin: purchased from Greenlink (Jining) Chemical Technology Co., Ltd., model number TY04;

[0039] Unless otherwise specified, all other raw materials can be purchased from the market.

[0040] Preparation Example 1

[0041] The preparation method of modified rosin resin A includes the following steps:

[0042] S1. Mix 100g disproportionated rosin, 5g 2,5-dihydroxybenzoic acid, 25g bisphenol A type epoxy resin and 0.3g triphenylphosphine evenly, and heat to 110℃ under a nitrogen protective atmosphere for 3.5h to obtain the reactant;

[0043] S2. Mix the reactants obtained in step S1, 4g of N-hydroxyethylpiperazine and 6g of maleic anhydride, heat to 150℃ and react for 2.5h, add 3g of KH-560 dropwise and keep the temperature for another 0.5h, maintain 150℃, add 0.5g of aluminum acetylacetonate at -0.08MPa, and continue vacuum stirring for 0.5h to obtain modified rosin resin A.

[0044] Preparation Example 2

[0045] The preparation method of modified rosin resin B is the same as that of preparation example 1, except that the amount of bisphenol A type epoxy resin added in step S1 is 18g.

[0046] Preparation Example 3

[0047] The preparation method of modified rosin resin C is the same as that of preparation example 1, except that the amount of bisphenol A type epoxy resin added in step S1 is 32g.

[0048] Preparation Example 4

[0049] The preparation method of modified rosin resin D is the same as that of preparation example 1, except that the amount of KH-560 added in step S2 is 1.6g.

[0050] Preparation Example 5

[0051] The preparation method of modified rosin resin E is the same as that of preparation example 1, except that the amount of KH-560 added in step S2 is 4.8g.

[0052] Preparation Example 6

[0053] The preparation method of modified rosin resin F is the same as that of preparation example 1, except that the amount of maleic anhydride added in step S2 is 4g.

[0054] Preparation Example 7

[0055] The preparation method of modified rosin resin G is the same as that of preparation example 1, except that the amount of maleic anhydride added in step S2 is 8g.

[0056] Example 1

[0057] A battery label adhesive with alkali resistance, comprising, by weight, the following raw materials: 60 parts isooctyl acrylate, 12.5 parts methyl methacrylate, 2.8 parts hexafluorobutyl methacrylate, 6.2 parts 2-hydroxyethyl acrylate, 0.65 parts ammonium persulfate, 15 parts modified rosin resin A, 0.3 parts mercaptoethanol, 50 parts ethyl acetate, and 3.5 parts isoflurane diisocyanate.

[0058] The preparation method of the pressure-sensitive adhesive in this embodiment includes the following steps:

[0059] 1. Isooctyl acrylate, methyl methacrylate, hexafluorobutyl methacrylate, 2-hydroxyethyl acrylate and 60 wt% ethyl acetate were added to a reaction vessel, nitrogen gas was introduced, the mixture was heated to 65°C and kept at this temperature for 35 min, then 60 wt% ammonium persulfate was added and the mixture was kept at this temperature for 1.5 h to obtain the reaction intermediate.

[0060] 2. Modified rosin resin A, mercaptoethanol, and the remaining ethyl acetate are mixed and added to the reaction intermediate prepared in step 1. The mixture is kept at 65°C for 50 min, the remaining ammonium persulfate is added, the temperature is raised to 75°C, and the mixture is kept at 75°C for 1.5 h. The mixture is then cooled to room temperature and discharged to obtain polyacrylate resin.

[0061] 3. Mix the polyacrylate resin and isoflurane diisocyanate obtained in step 2 and stir evenly to obtain acrylic pressure-sensitive adhesive.

[0062] Example 2

[0063] A pressure-sensitive adhesive for battery tags, comprising, by weight, the following raw materials: 25 parts isooctyl acrylate, 25 parts butyl acrylate, 10 parts methyl methacrylate, 1.8 parts hexafluorobutyl methacrylate, 4.2 parts 2-hydroxyethyl acrylate, 0.5 parts ammonium persulfate, 10 parts modified rosin resin A, 0.2 parts mercaptoethanol, 40 parts ethyl acetate, and 2 parts isoflurane diisocyanate.

[0064] The preparation method of the pressure-sensitive adhesive in this embodiment includes the following steps:

[0065] 1. Isooctyl acrylate, butyl acrylate, methyl methacrylate, hexafluorobutyl methacrylate, 2-hydroxyethyl acrylate and 60 wt% ethyl acetate are added to a reaction vessel, nitrogen gas is introduced, the mixture is heated to 70°C and kept at this temperature for 30 min. Then, 60 wt% ammonium persulfate is added and the mixture is kept at this temperature for 1 h to obtain the reaction intermediate.

[0066] 2. Modified rosin resin A, mercaptoethanol, and the remaining ethyl acetate are mixed and added to the reaction intermediate prepared in step 1. The mixture is kept at 70°C for 40 min, the remaining ammonium persulfate is added, the temperature is raised to 80°C, and the mixture is kept at 80°C for 1.5 h. The mixture is then cooled to room temperature and discharged to obtain polyacrylate resin.

[0067] 3. Mix the polyacrylate resin and isoflurane diisocyanate obtained in step 2 and stir evenly to obtain acrylic pressure-sensitive adhesive.

[0068] Example 3

[0069] A pressure-sensitive adhesive for battery tags, comprising, by weight, the following raw materials: 70 parts isooctyl acrylate, 15 parts methyl methacrylate, 3.8 parts hexafluorobutyl methacrylate, 8.2 parts 2-hydroxyethyl acrylate, 0.8 parts ammonium persulfate, 20 parts modified rosin resin A, 0.4 parts mercaptoethanol, 60 parts ethyl acetate, and 5 parts isoflurane diisocyanate.

[0070] The preparation method of the pressure-sensitive adhesive in this embodiment includes the following steps:

[0071] 1. Isooctyl acrylate, methyl methacrylate, hexafluorobutyl methacrylate, 2-hydroxyethyl acrylate and 60 wt% ethyl acetate were added to a reaction vessel, nitrogen gas was introduced, the mixture was heated to 60°C and kept at this temperature for 40 min, then 60 wt% ammonium persulfate was added and the mixture was kept at this temperature for 2 h to obtain the reaction intermediate.

[0072] 2. Modified rosin resin A, mercaptoethanol, and the remaining ethyl acetate are mixed and added to the reaction intermediate prepared in step 1. The mixture is kept at 60°C for 60 min. The remaining ammonium persulfate is added, the temperature is raised to 75°C, and the mixture is kept at 75°C for 2 h. The mixture is then cooled to room temperature and discharged to obtain polyacrylate resin.

[0073] 3. Mix the polyacrylate resin and isoflurane diisocyanate obtained in step 2 and stir evenly to obtain acrylic pressure-sensitive adhesive.

[0074] Example 4

[0075] A type of alkali-resistant pressure-sensitive adhesive for battery tags and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin B is used instead of modified rosin resin A.

[0076] Example 5

[0077] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin C is used instead of modified rosin resin A.

[0078] Example 6

[0079] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin D is used instead of modified rosin resin A.

[0080] Example 7

[0081] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin E is used instead of modified rosin resin A.

[0082] Example 8

[0083] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin F is used instead of modified rosin resin A.

[0084] Example 9

[0085] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of modified rosin resin G is used instead of modified rosin resin A.

[0086] Comparative Example 1

[0087] A battery label adhesive with alkali resistance and pressure sensitivity and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal amount of disproportionated rosin TY04 is used to replace modified rosin resin A.

[0088] Effect evaluation:

[0089] The pressure-sensitive adhesives prepared in Examples 1-9 and Comparative Example 1 were tested and analyzed. The specific results are shown in Table 1.

[0090] Performance testing:

[0091] The pressure-sensitive adhesive was coated onto the upper surface of a 50μm thick PET release layer using a coating machine. The thickness of the adhesive layer was adjusted to 0.5mm to form a pressure-sensitive adhesive layer. After drying, it was cured at 50℃ for 72h to obtain the pressure-sensitive adhesive layer. Then, a 0.2mm PET substrate layer was laminated onto the upper surface of the pressure-sensitive adhesive layer obtained in step four using the tail of the coating machine. After slitting, the tape was obtained.

[0092] (1) Initial tack: Tested according to the FINAT FTM9 test method of the Global Association for Non-dry Labels and Related Products;

[0093] (2) Alkali resistance: The pressure-sensitive adhesive layer is bonded to the aluminum sheet to make the test sample. The sample is then completely immersed in the electrolyte, which contains 1 mol of LiPF6 as the solute and ethylene carbonate: diethyl carbonate: methyl ethyl carbonate = 3:5:2 (volume ratio) as the solvent. The sample is soaked at 85°C for 8 hours and then cooled to room temperature before being tested according to the above method.

[0094] (3) Adhesion: According to standard GB / T4851-2014, a standard tape (25mm wide and 100mm long) is attached to a stainless steel plate, with the upper end aligned with the standard line. The excess part at the lower end is cut off. After pressing back and forth three times with a 2kg pressure roller, the plate is left at room temperature for 30 minutes. The stainless steel plate with the sample attached is then hung vertically on the test frame and kept still. A 500g weight is suspended below. The time it takes for the tape to fall represents the adhesion of the pressure-sensitive adhesive.

[0095] Table 1

[0096]

[0097] As shown in Table 1, the pressure-sensitive adhesives prepared in Examples 1-3 have good tack and alkali resistance.

[0098] Compared to Example 1, Examples 4-5 changed the mass ratio of rosin and bisphenol A epoxy resin during the preparation of the modified rosin resin. In Example 4, the crosslinking density was reduced, the cohesive strength decreased slightly, and the stability in an alkaline environment was reduced, making the saponification reaction more likely to occur, which affected the tack and alkali resistance. On the other hand, excessive crosslinking caused the adhesive layer to become brittle and produce microcracks, which reduced the initial tack and tack.

[0099] Compared to Example 1, Examples 6-7 changed the mass ratio of N-hydroxyethylpiperazine and KH-560 in the preparation of modified rosin resin. In Example 6, the reduction of KH-560 weakened the shielding effect of the siloxane network, making it easier for alkaline substances to corrode the resin, resulting in a significant decrease in adhesion after alkali treatment. At the same time, the crosslinking density decreased, the cohesive strength decreased, and the holding time was significantly shortened. In Example 7, excessive self-condensation of silane formed a rigid microphase, resulting in excessive concentration of interfacial stress and a decrease in initial tack and holding power.

[0100] Examples 8-9 differed from Example 1 in that the mass ratio of N-hydroxyethylpiperazine and maleic anhydride was changed during the preparation of the modified rosin resin. Example 8 had a low crosslinking density, decreased cohesive strength, and significantly shortened holding time. Similarly, excessive maleic anhydride would cause excessive imide, leading to excessive rigidity of the resin, increased internal stress, and simultaneous deterioration of holding and initial tack.

[0101] Compared to Example 1, Comparative Example 1 used an equal amount of disproportionated rosin TY04 to replace modified rosin resin A. The unmodified rosin resin had poor compatibility with the acrylic system and was prone to phase separation, which affected its tack and alkali resistance.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present application in any way. Although the present application discloses the preferred embodiment as described above, it is not intended to limit the present application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of the present application using the disclosed technical content are equivalent to equivalent implementation cases. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. A type of alkali-resistant pressure-sensitive adhesive for battery tags, characterized in that, The pressure-sensitive adhesive comprises the following raw materials by weight: 50-70 parts of soft monomer, 10-15 parts of hard monomer, 6-12 parts of functional monomer, 0.5-0.8 parts of initiator, 10-20 parts of modified rosin resin, 0.2-0.4 parts of chain transfer agent, 40-60 parts of solvent, and 2-5 parts of curing agent.

2. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 1, characterized in that, The soft monomer is isooctyl acrylate and / or butyl acrylate.

3. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 1, characterized in that, The hard monomer is any one or more of methyl methacrylate, vinyl acetate, and methyl acrylate.

4. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 1, characterized in that, The functional monomer is any two of hexafluorobutyl methacrylate, 2-hydroxyethyl acrylate, and glycidyl methacrylate.

5. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 1, characterized in that, The preparation method of the modified rosin resin includes the following steps: S1. Mix rosin, 2,5-dihydroxybenzoic acid, bisphenol A epoxy resin and catalyst, and heat to 100-115℃ under an inert gas atmosphere for 3-4.5 h to obtain the reactant; S2. Mix the reactants obtained in step S1, N-hydroxyethylpiperazine and maleic anhydride, heat to 140-160℃ and react for 2-3 hours, add KH-560 dropwise and keep the temperature for another 0.5-1 hour, then add aluminum acetylacetone to react and obtain modified rosin resin.

6. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 5, characterized in that, The mass ratio of rosin to bisphenol A epoxy resin in step S1 is 1:(0.2-0.3).

7. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 5, characterized in that, The mass ratio of N-hydroxyethylpiperazine to maleic anhydride in step S2 is 1:(1.2-1.8).

8. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 5, characterized in that, The mass ratio of N-hydroxyethylpiperazine and KH-560 in step S2 is 1:(0.5-1).

9. The alkali-resistant pressure-sensitive adhesive for battery tags according to claim 1, characterized in that, The chain transfer agent is any one or more of mercaptoacetic acid, mercaptopropionic acid, and mercaptoethanol.

10. A method for preparing an alkali-resistant pressure-sensitive adhesive for battery labels according to any one of claims 1-9, characterized in that, It includes the following steps:

1. Add the soft monomer, hard monomer, functional monomer and part of the solvent into the reaction vessel, introduce inert gas, heat to 60-70℃, keep the reaction temperature for 30-40 min, add part of the initiator, keep the reaction temperature for 1-2 h, and obtain the reaction intermediate.

2. After mixing the modified rosin resin, chain transfer agent, and remaining solvent, add them to the reaction intermediate prepared in step 1. Keep the reaction at 60-70℃ for 40-60 min, add the remaining initiator, raise the temperature to 75-80℃, keep the reaction at 70℃ for 1.5-2 h, cool and discharge the material to obtain polyacrylate resin.

3. Mix the polyacrylate resin and curing agent obtained in step 2 and stir to obtain acrylic pressure-sensitive adhesive.

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