Acrylate pressure-sensitive adhesive with high holding power and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of pressure-sensitive adhesive materials, and discloses an acrylate pressure-sensitive adhesive with high holding power and a preparation method thereof. Comprising the following raw materials in percentage by weight: 80%-90% of a main chain polymer, 10%-25% of tackifying resin, 0.1%-2% of a cross-linking agent, 0.8%-1% of a flexibilizer, 0.7%-1.3% of a stabilizer, 0.1%-1% of a flatting agent, 0.5%-1% of a functional monomer, 0.1%-0.2% of a dispersing agent and 10%-15% of a solvent. The rosin resin and the terpene resin are added into the main chain polymer, so that the initial adhesive force is remarkably improved, the adhesive can realize reliable bonding in a short time, and the isocyanate cross-linking agent is introduced to form a stable three-dimensional network structure, so that the cohesive force and the bonding firmness of the adhesive are greatly enhanced; compared with a traditional acrylate pressure-sensitive adhesive, the pressure-sensitive adhesive can keep stable bonding strength even under the severe conditions of high temperature, high humidity or severe temperature difference change and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure-sensitive adhesive material manufacturing, and specifically relates to a high-adhesion-holding acrylic pressure-sensitive adhesive and a preparation method thereof. Background Art

[0002] Acrylic pressure-sensitive adhesives have been widely used in the industrial field due to their excellent performance. They use acrylic polymers as the main component and are modified by adding tackifying resins, cross-linking agents and other modified materials to give them good transparency, weather resistance, and easy coating and processing.

[0003] This type of adhesive occupies an important position in the fields of electronic manufacturing, automotive industry, building materials, packaging and medical tapes, and can meet a variety of application scenarios from lightweight materials to high adhesion requirements. However, with the rapid development of industrial technology and the expansion of high-end application fields, higher requirements are placed on the performance of acrylic pressure-sensitive adhesives.

[0004] Currently, the basic performance of acrylic pressure-sensitive adhesives on the market is acceptable, but they show significant deficiencies in meeting the reliability requirements under complex working conditions (such as high temperature, high humidity, low temperature and continuous load). For example, some products have insufficient initial viscosity, which makes it difficult to achieve efficient bonding in a short period of time. In addition, after long-term use or exposure to hot and humid environments, the sustained adhesion and peel strength of these adhesives often decrease significantly, affecting their application life in industrial production. At the same time, the current acrylic pressure-sensitive adhesives, due to the high peel strength usually requires the adhesive to have a high cross-linking density, while the sustained adhesion performance requires appropriate molecular chain flexibility, resulting in it being unable to take into account both high peel strength and sustained adhesion performance, so it needs to be improved and optimized. Summary of the invention

[0005] The object of the present invention is to provide an acrylic pressure-sensitive adhesive with high sustained adhesion performance and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention provides the following technical scheme: a high-holding acrylate pressure-sensitive adhesive and a preparation method thereof, comprising the following raw materials in weight percentage: 80%-90% of a main chain polymer, 10%-25% of a tackifying resin, 0.1%-2% of a cross-linking agent, 0.8%-1% of a toughening agent, 0.7%-1.3% of a stabilizer, 0.1%-1% of a leveling agent, 0.5%-1% of a functional monomer, 0.1%-0.2% of a dispersant, and 10%-15% of a solvent;

[0007] The main chain polymer is made of butyl acrylate and methyl methacrylate, the tackifying resin is rosin resin and terpene resin, the cross-linking agent is an isocyanate compound, the toughening agent is a hyperbranched polyester, the stabilizer includes 0.3%-0.5% of an antioxidant, 0.2%-0.5% of a light stabilizer and 0.2%-0.3% of a UV absorber, the functional monomer is hydroxypropyl acrylate, and the solvent is made of ethyl acetate and ethyl acetate.

[0008] Preferably, the rosin resin is one of MG130 and MG105, the terpene resin is one of T95, T135, H150, 1510 and 803L, and the dispersant is one of BYK-180 and BYK-200.

[0009] Preferably, the preparation process of the acrylic pressure-sensitive adhesive is:

[0010] Step 1, preparation of the main chain polymer, under the protection of inert gas, mixing acrylate monomers, butyl acrylate and methyl methacrylate with a solvent, then adding hydroxypropyl acrylate, and finally adding an initiator and stirring to obtain a glue solvent;

[0011] Step 2, adding tackifying resin, adding a pre-dissolved tackifying resin solution to the polymerized glue solvent, stirring for half an hour, and then adding another tackifying resin solution and stirring for half an hour;

[0012] Step 3, adding the additives, under stirring conditions, sequentially adding the crosslinking agent, hyperbranched polyester, stabilizer, leveling agent and dispersant according to the formula ratio, ensuring uniform mixing, to obtain an adhesive solution;

[0013] Step 4: Filtration and degassing: filter the mixed adhesive solution using a 300-mesh filter, then put the filtered adhesive into a vacuum degassing device, evacuate to -0.08MPa, maintain for 10-15 minutes, and remove bubbles to obtain a finished adhesive;

[0014] Step five: coating and testing: coat the prepared finished adhesive with a small laboratory coating machine, and then take it out for testing.

[0015] Preferably, in the step 1, after the acrylic ester monomer is mixed with the solvent and the initiator, it is necessary to heat to 60-90° C. and continue stirring for 3-5 hours.

[0016] Preferably, in step 2, the tackifying resin needs to be filtered through a 300-mesh filter when added to avoid the entry of impurities and residues.

[0017] Preferably, in the step 3, the crosslinking agent is stirred for 30 minutes after being added; the hyperbranched polyester is stirred for 20 minutes after being added; when adding the stabilizer, the antioxidant and the light stabilizer are first added, and the UV absorber is added after stirring for 10 minutes; the leveling agent and the dispersant are stirred for 10 minutes after being added.

[0018] Preferably, in step 5, the specific steps of coating are:

[0019] A1, using a laboratory coater, evenly coat a 50 μm thick layer of adhesive on a 36 μm thick release film;

[0020] A2, put the coated adhesive film into an oven at 120°C for 5 minutes to completely evaporate the solvent;

[0021] A3, the dried adhesive film is laminated onto a 25 μm thick corona-treated PET substrate using an automatic laminating machine to produce a single-sided tape;

[0022] A4, store the prepared single-sided tape at 40°C for 3 days to complete cross-linking and curing. Once the performance is stable, the test can be carried out.

[0023] Preferably, when testing the single-sided tape, a SUS304 stainless steel plate with a specially treated surface is selected as the adherend, and the test is performed through a peel strength test and a holding force test;

[0024] Wherein, the peel strength test is measured with reference to GB / T2792-1998; and the adhesion test is measured with reference to GB / T4851-1998.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The present invention significantly improves the initial adhesion by adding rosin resin and terpene resin to the main chain polymer, so that the adhesive can achieve reliable bonding in a short time. By introducing isocyanate cross-linking agents, a stable three-dimensional network structure is formed, which greatly enhances the cohesion and bonding firmness of the adhesive, thereby ensuring long-term adhesion performance. Compared with traditional acrylic pressure-sensitive adhesives, this adhesive can maintain stable bonding strength even under harsh conditions such as high temperature, high humidity or drastic temperature changes.

[0027] 2. The present invention effectively improves the flexibility of the adhesive and significantly reduces its brittleness by adding hyperbranched polyester, so that it has stronger resistance to mechanical impact during the bonding process. Compared with traditional acrylic pressure-sensitive adhesives, the improved flexibility of the adhesive not only effectively avoids the cracking of the adhesive layer due to external forces, but also enhances the fatigue resistance of the product, and can adapt to complex working conditions such as repeated stretching and bending.

[0028] 3. In the preparation process, the present invention significantly reduces energy consumption by finely controlling the reaction temperature, time and component ratio, reduces the use of solvents and volatilization in the production process, and embodies the concept of green chemistry. At the same time, the reasonable addition of stabilizers and antioxidants prolongs the service life of the adhesive, thereby reducing the frequency of material replacement and waste, which is conducive to the implementation of the sustainable development strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the preparation method of the present invention;

[0030] Figure 2 It is a schematic diagram of the coating and testing process of the present invention;

[0031] Figure 3 It is a schematic diagram of the test results of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 3 As shown, the embodiment of the present invention provides a high-holding acrylate pressure-sensitive adhesive and a preparation method thereof, comprising the following raw materials in weight percentage: 80%-90% of a main chain polymer, 10%-25% of a tackifying resin, 0.1%-2% of a cross-linking agent, 0.8%-1% of a toughening agent, 0.7%-1.3% of a stabilizer, 0.1%-1% of a leveling agent, 0.5%-1% of a functional monomer, 0.1%-0.2% of a dispersant, and 10%-15% of a solvent;

[0034] The main chain polymer is made of butyl acrylate and methyl methacrylate, the tackifying resin is rosin resin and terpene resin, the cross-linking agent is an isocyanate compound, the toughening agent is a hyperbranched polyester, the stabilizer includes 0.3%-0.5% of an antioxidant, 0.2%-0.5% of a light stabilizer and 0.2%-0.3% of a UV absorber, the functional monomer is hydroxypropyl acrylate, and the solvent is made of ethyl acetate and ethyl acetate.

[0035] Among them, the main chain polymer is formed by free radical polymerization to provide basic bonding strength; the tackifier resin is used to enhance the initial adhesion and lasting adhesion of the adhesive and increase the anti-aging performance of the adhesive; the addition of the cross-linker improves the bonding strength and high temperature resistance by forming a three-dimensional network structure; the addition of the toughener is used to improve the flexibility and fatigue resistance of the adhesive, increase the flexibility of the molecular chain, and reduce the brittleness of the colloid; the addition of the leveling agent is used to reduce the surface tension, make the adhesive smoother during the coating process, reduce the orange peel phenomenon, and improve the gloss; a small amount of functional monomers is added to form hydrogen bonds or chemical crosslinks with the main chain polymer to further improve the bonding performance and lasting adhesion in a hot and humid environment; finally, the addition of the dispersant can enhance the compatibility of the tackifier resin (rosin resin, terpene resin) with the main chain polymer to avoid phase separation during stirring or storage.

[0036] By adding rosin resin and terpene resin to the main chain polymer, the initial adhesion is significantly improved, allowing the adhesive to achieve reliable bonding in a short time. By introducing isocyanate cross-linking agents, a stable three-dimensional network structure is formed, which greatly enhances the cohesion and bonding strength of the adhesive, thereby ensuring long-term adhesion performance. Compared with traditional acrylic pressure-sensitive adhesives, this adhesive can maintain stable bonding strength even under harsh conditions such as high temperature, high humidity or drastic temperature changes.

[0037] The rosin resin is one of MG130 and MG105, the terpene resin is one of T95, T135, H150, 1510 and 803L, and the dispersant is one of BYK-180 and BYK-200.

[0038] The preparation process of the acrylic pressure-sensitive adhesive is as follows:

[0039] Step 1, preparation of the main chain polymer, under the protection of an inert gas (such as nitrogen), mixing acrylate monomers, butyl acrylate and methyl methacrylate with a solvent, then adding hydroxypropyl acrylate, and finally adding an initiator and stirring to obtain a glue solvent;

[0040] This step is to mix the main ingredients and initiate polymerization at a temperature of 60-90°C under stirring;

[0041] Step 2, adding tackifying resin, adding a pre-dissolved tackifying resin solution to the polymerized glue solvent, stirring for half an hour, and then adding another tackifying resin solution and stirring for half an hour;

[0042] Add tackifying resin in batches with stirring to gradually blend and reduce phase separation to ensure uniform performance;

[0043] Step 3, adding the additives, under stirring conditions, sequentially adding the crosslinking agent, hyperbranched polyester, stabilizer, leveling agent and dispersant according to the formula ratio, ensuring uniform mixing, to obtain an adhesive solution;

[0044] By adding and stirring multiple groups of additives in sequence, the material is modified to ensure the performance of the finished rubber produced later;

[0045] The addition of hyperbranched polyester effectively improves the flexibility of the adhesive and significantly reduces its brittleness, making it more resistant to mechanical impact during the bonding process. Compared with traditional acrylic pressure-sensitive adhesives, the improved flexibility of this adhesive not only effectively avoids the cracking of the adhesive layer due to external forces, but also enhances the fatigue resistance of the product, and can adapt to complex working conditions such as repeated stretching and bending.

[0046] Step 4: Filtration and degassing: filter the mixed adhesive solution using a 300-mesh filter, then put the filtered adhesive into a vacuum degassing device, evacuate to -0.08MPa, maintain for 10-15 minutes, and remove bubbles to obtain a finished adhesive;

[0047] Filtering can avoid uneven coating or defects caused by particles, and removing bubbles can make the contact between the adhesive and the substrate more complete, improving the bonding performance.

[0048] Step five: coating and testing: coat the prepared finished adhesive with a small laboratory coating machine, and then take it out for testing.

[0049] Wherein, in the step 1, after the acrylic ester monomer is mixed with the solvent and the initiator, it is necessary to heat to 60-90° C. and continue stirring for 3-5 hours.

[0050] Wherein, in the step 2, the tackifying resin needs to be filtered through a 300-mesh filter when added to avoid the entry of impurities and residues.

[0051] Wherein, the crosslinking agent in the step 3 is kept stirred for 30 minutes after being added; the hyperbranched polyester is kept stirred for 20 minutes after being added; when adding the stabilizer, the antioxidant and the light stabilizer are first added, and the UV absorber is added after stirring for 10 minutes; the leveling agent and the dispersant are kept stirred for 10 minutes after being added.

[0052] The introduction of hyperbranched polyester can improve the fatigue resistance and moisture and heat resistance of the adhesive, further improve the flexibility and the adhesion under long-term load, and the addition amount is small and will not affect the transparency of the adhesive layer;

[0053] Among the stabilizers, antioxidants are used to improve the resistance to thermal oxidation and extend the life of the adhesive, light stabilizers are used to inhibit photoaging caused by ultraviolet rays, and UV absorbers can further improve weather resistance and prevent the adhesive from degrading under long-term exposure to ultraviolet rays.

[0054] Wherein, in said step 5, the specific steps of coating are:

[0055] A1, using a laboratory coater, evenly coat a 50 μm thick layer of adhesive on a 36 μm thick release film;

[0056] The adhesive coating is controlled uniformly by a laboratory coater, the thickness is stabilized at 50μm, and the variables are stabilized;

[0057] A2, put the coated adhesive film into an oven at 120°C for 5 minutes to completely evaporate the solvent;

[0058] Treat the samples in an oven at 120°C to effectively remove solvents such as ethyl acetate, avoiding the negative impact of solvent residues on bonding performance. High-temperature baking allows the film to initially cross-link and solidify, which helps optimize its cohesion and bonding performance.

[0059] A3, the dried adhesive film is laminated onto a 25 μm thick corona-treated PET substrate using an automatic laminating machine to produce a single-sided tape;

[0060] The corona-treated PET substrate surface is activated, the surface energy is increased, and the bonding strength between the adhesive and the substrate is enhanced;

[0061] A4, store the prepared single-sided tape at 40°C for 3 days to complete cross-linking and curing. Once the performance is stable, the test can be carried out.

[0062] When testing the single-sided tape, a SUS304 stainless steel plate with a specially treated surface is selected as the adherend, and the test is carried out through peel strength test and adhesion test;

[0063] During the preparation process, by finely controlling the reaction temperature, time and component ratio, energy consumption is significantly reduced, and the use of solvents and volatilization in the production process are reduced, reflecting the concept of green chemistry. At the same time, the reasonable addition of stabilizers and antioxidants extends the service life of the adhesive, thereby reducing the frequency of material replacement and waste, which is conducive to the implementation of the sustainable development strategy.

[0064] The peel strength test is carried out according to GB / T2792-1998 (test method for 180° peel strength of pressure-sensitive adhesive tape); and the holding force test is carried out according to GB / T4851-1998 (test method for holding force of pressure-sensitive adhesive tape).

[0065] The peel strength test includes 180°RT peel strength test and 180°high temperature peel strength test;

[0066] For the 180° RT peel test, the tape sample needs to be cut into strips with a width of 25 mm and a length of 170 mm. The tape is attached to a stainless steel plate in an environment of 23±2°C / 50±10% RH. A 2KG automatic roller press is used to press the tape back and forth 3 times without applying pressure. The tape is left to stand for 20 minutes, and then peeled 180° at a speed of 300 mm / min.

[0067] For the 180° high temperature peel strength test, the tape sample needs to be cut into strips with a width of 25mm and a length of 170mm. The tape is attached to a stainless steel plate in an environment of 23±2℃ / 50±10%RH. A 2KG automatic roller press is used to press the tape back and forth 3 times without applying pressure. The tape is then placed in a pre-set 85℃ high temperature tensile test oven, left to stand for 30 minutes, and then peeled 180° at a speed of 300mm / min.

[0068] The adhesion test includes 180° adhesion test and 90° adhesion test;

[0069] Among them, the 180° adhesion test needs to be performed in an environment of 23±2℃ / 50±10%RH, and the bonding area must be 25mm×25mm. Then, a 2KG automatic roller press is used without applying pressure to press back and forth 3 times. After standing for 20 minutes, it is placed in an 80℃ oven and hung with a 1KG weight. The test time is 168 hours. During the test, the time (min) from the tape being hung with the weight to the tape falling down or the distance (mm) being moved is observed every day.

[0070] The 90° adhesion test also requires lamination in a 23±2℃ / 50±10%RH environment, and ensure that the lamination area is 20mm×170mm. Then use a 2KG automatic roller press without applying pressure, with a rolling speed of 600mm / min, press back and forth 3 times, let it stand for 20 minutes, then put it in a 50℃ oven and hang a 100G weight. The test time is 72H. During the test, the moving distance (mm) of 1H, 4H, 24H, 48H, and 72H needs to be recorded.

[0071] Example 1: The raw materials were prepared according to the above basic scheme, that is, 85% butyl acrylate + 15% methyl methacrylate were used as the main chain polymer, 0.8% toughening agent, 0.7% stabilizer, 1% functional monomer, 0.1% dispersant and 1% leveling agent were added as additives, 10% MG130:T95 dry glue was mixed into the polymerized glue as a tackifier, 0.6% Y-105 with an NCO content of about 12% was used as a cross-linking agent, and after sufficient stirring, a high-holding acrylate pressure-sensitive adhesive was prepared. The test results are detailed in Figure 3 .

[0072] Example 2: The proportion of butyl acrylate was reduced to 80% + methyl methacrylate 15%, 5% of ethoxyethyl acrylate was added to further improve flexibility, 0.8% of toughening agent, 0.7% of stabilizer, 1% of functional monomer, 0.1% of dispersant and 1% of leveling agent were added as additives, MG105:T135 dry glue 24%:9% was mixed into the polymerized glue as a tackifier, and 0.6% of Y-105 with an NCO content of about 12% was used as a cross-linking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high holding performance was prepared. This example not only ensured high holding properties but also significantly improved the peel strength. The test results are detailed in Figure 3 .

[0073] Example 3: The proportion of butyl acrylate was reduced to 80% + methyl methacrylate 15%, 5% of ethoxyethyl acrylate was added to further improve flexibility, 0.8% of toughening agent, 0.7% of stabilizer, 1% of functional monomer, 0.1% of dispersant and 1% of leveling agent were added as additives, MG105:H150 dry glue 24%:9% was mixed into the polymerized glue as a tackifier, and 0.6% of Y-105 with an NCO content of about 12% was used as a cross-linking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high holding performance was prepared. This example not only ensured high holding properties but also significantly improved the peel strength. The test results are detailed in Figure 3 .

[0074] Example 4: The proportion of butyl acrylate was reduced to 80% + methyl methacrylate 15%, 5% of ethoxyethyl acrylate was added to further improve flexibility, 0.8% of toughening agent, 0.7% of stabilizer, 1% of functional monomer, 0.1% of dispersant and 1% of leveling agent were added as additives, MG105:1510 dry glue 24%:9% was mixed into the polymerized glue as a tackifier, and 0.6% of Y-105 with an NCO content of about 12% was used as a cross-linking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high holding performance was prepared. This example not only ensures high holding performance but also significantly improves peel strength. The test results are detailed in Figure 3 .

[0075] Example 5: The proportion of butyl acrylate was reduced to 80% + methyl methacrylate 15%, 5% of ethoxyethyl acrylate was added to further improve flexibility, 0.8% toughening agent, 0.7% stabilizer, 1% functional monomer, 0.1% dispersant and 1% leveling agent were added as additives, MG105:803L dry glue 24%:9% was mixed into the polymerized glue as a tackifier, and 0.6% of Y-105 with an NCO content of about 12% was used as a crosslinking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high holding performance was prepared. This example not only ensures high holding performance but also significantly improves peel strength. For details of the test results, see Figure 3 .

[0076] Comparative Example 1: 85% butyl acrylate + 15% methyl methacrylate are used as the main chain polymer, 0.7% stabilizer and 1% leveling agent are added as additives, 10% MG130 dry glue is mixed into the polymerized glue as a tackifier, and 0.6% Y-105 with an NCO content of about 12% is used as a cross-linking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high adhesion performance is prepared. The test results are detailed in Figure 3 .

[0077] Comparative Example 2: 85% butyl acrylate + 15% methyl methacrylate are used as the main chain polymer, 0.7% stabilizer and 1% leveling agent are added as additives, 10% MG130 dry glue is mixed into the polymerized glue as a tackifier, and 0.25% Y-105 with an NCO content of about 12% is used as a cross-linking agent. After sufficient stirring, an acrylic pressure-sensitive adhesive with high adhesion performance is prepared. The test results are detailed in Figure 3 .

[0078] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-tack acrylate pressure-sensitive adhesive, characterized in that: The raw materials include the following weight percentages: 80%-90% of main chain polymer, 10%-25% of tackifying resin, 0.1%-2% of cross-linking agent, 0.8%-1% of toughening agent, 0.7%-1.3% of stabilizer, 0.1%-1% of leveling agent, 0.5%-1% of functional monomer, 0.1%-0.2% of dispersant and 10%-15% of solvent; The main chain polymer is made of butyl acrylate and methyl methacrylate, the tackifying resin is rosin resin and terpene resin, the cross-linking agent is an isocyanate compound, the toughening agent is a hyperbranched polyester, the stabilizer includes 0.3%-0.5% of an antioxidant, 0.2%-0.5% of a light stabilizer and 0.2%-0.3% of a UV absorber, the functional monomer is hydroxypropyl acrylate, and the solvent is made of ethyl acetate and ethyl acetate.

2. The high-tack acrylate pressure-sensitive adhesive according to claim 1, characterized in that: The rosin resin is one of MG130 and MG105, the terpene resin is one of T95, T135, H150, 1510 and 803L, and the dispersant is one of BYK-180 and BYK-200.

3. The method for preparing a high-tack acrylate pressure-sensitive adhesive according to claim 1, characterized in that: The preparation process of the acrylic pressure-sensitive adhesive is as follows: Step 1, preparation of the main chain polymer, under the protection of inert gas, mixing acrylate monomers, butyl acrylate and methyl methacrylate with a solvent, then adding hydroxypropyl acrylate, and finally adding an initiator and stirring to obtain a glue solvent; Step 2, adding tackifying resin, adding a pre-dissolved tackifying resin solution to the polymerized glue solvent, stirring for half an hour, and then adding another tackifying resin solution and stirring for half an hour; Step 3, adding the additives, under stirring conditions, sequentially adding the crosslinking agent, hyperbranched polyester, stabilizer, leveling agent and dispersant according to the formula ratio, ensuring uniform mixing, to obtain an adhesive solution; Step 4: Filtration and degassing: filter the mixed adhesive solution using a 300-mesh filter, then put the filtered adhesive into a vacuum degassing device, evacuate to -0.08MPa, maintain for 10-15 minutes, and remove bubbles to obtain a finished adhesive; Step five: coating and testing: coat the prepared finished adhesive with a small laboratory coating machine, and then take it out for testing.

4. The method for preparing a high-maintenance acrylic pressure-sensitive adhesive according to claim 3, characterized in that: In the step 1, after the acrylic ester monomer is mixed with the solvent and the initiator, it is necessary to heat to 60-90° C. and continue stirring for 3-5 hours.

5. The method for preparing a high-maintenance acrylic pressure-sensitive adhesive according to claim 3, characterized in that: In the step 2, the tackifying resin needs to be filtered through a 300-mesh filter when added to avoid the entry of impurities and residues.

6. The method for preparing a high-maintenance acrylic pressure-sensitive adhesive according to claim 3, characterized in that: In the step 3, the crosslinking agent is stirred for 30 minutes after being added; the hyperbranched polyester is stirred for 20 minutes after being added; when adding the stabilizer, the antioxidant and light stabilizer are added first, and the UV absorber is added after stirring for 10 minutes; the leveling agent and dispersant are stirred for 10 minutes after being added.

7. The method for preparing a high-maintenance acrylic pressure-sensitive adhesive according to claim 3, characterized in that: In the step 5, the specific steps of coating are: A1, using a laboratory coater, evenly coat a 50 μm thick layer of adhesive on a 36 μm thick release film; A2, put the coated adhesive film into an oven at 120℃ and bake for 5 minutes to make the solvent evaporate completely; A3, the dried adhesive film is laminated onto a 25 μm thick corona-treated PET substrate using an automatic laminating machine to produce a single-sided tape; A4, store the prepared single-sided tape at 40°C for 3 days to complete cross-linking and curing. Once the performance is stable, the test can be carried out.

8. The method for preparing a high-maintenance acrylic pressure-sensitive adhesive according to claim 3, characterized in that: When testing the single-sided tape, a SUS304 stainless steel plate with a specially treated surface is selected as the adherend, and the peel strength test and the adhesion test are performed for testing; Wherein, the peel strength test is measured with reference to GB / T2792-1998; and the adhesion test is measured with reference to GB / T4851-1998.

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