Acrylate pressure-sensitive adhesive as well as preparation method and application thereof

Abstract

The invention provides an acrylate pressure-sensitive adhesive as well as a preparation method and application thereof, and belongs to the technical field of pressure-sensitive adhesives. The preparation method comprises the following steps: mixing a hard monomer, a solvent and a first initiator solution for prepolymerization reaction to obtain a hard core; mixing a soft monomer and a functional monomer to obtain a monomer mixed solution, and respectively dropwise adding the monomer mixed solution and a second initiator solution into the hard core for polymerization reaction to form a soft segment coating layer to obtain a polymerization product; and mixing the polymerization product, tackifying resin and a cross-linking agent, and carrying out a cross-linking reaction to obtain the acrylate pressure-sensitive adhesive. The acrylate pressure-sensitive adhesive has a core-shell structure with a hard segment coated with a soft segment, the core-shell structure with a hard monomer as an inner core and a soft monomer as an outer shell is obtained through a step-by-step polymerization process, flexibility and cohesion strength are both considered, isobornyl acrylate is adopted as a functional monomer, compatibility and high temperature resistance are enhanced, and the pressure-sensitive adhesive can be applied to the field of pressure-sensitive adhesives. The prepared acrylate pressure-sensitive adhesive has the advantages of high peel strength, high cohesion strength and no adhesive residue.

Description

Technical Field

[0001] This invention relates to the field of pressure-sensitive adhesive technology, and in particular to an acrylic pressure-sensitive adhesive, its preparation method, and its application. Background Technology

[0002] Pressure-sensitive adhesives are also known as pressure-sensitive type adhesives, or simply pressure-sensitive adhesives.

[0003] There are four main types of pressure-sensitive adhesives used in industry: solvent-based pressure-sensitive adhesives, emulsion-based pressure-sensitive adhesives, hot-melt pressure-sensitive adhesives, and radiation-cured pressure-sensitive adhesives. Solvent-based acrylic pressure-sensitive adhesives have the following problems: random copolymerization of hard and soft segments can easily lead to uneven phase separation; it is difficult to balance high peel strength and high cohesion; tackifying resins can improve peel strength but reduce cohesive strength, easily causing residue, while high crosslinking enhances cohesion but leads to a decrease in initial tack; direct exposure of hard segments can easily lead to interfacial failure.

[0004] Therefore, there is an urgent need for an acrylic pressure-sensitive adhesive with high peel strength, high cohesive strength, and no residue. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an acrylic pressure-sensitive adhesive, its preparation method, and its application. The acrylic pressure-sensitive adhesive prepared by this invention has the advantages of high peel strength, high cohesive strength, and no adhesive residue.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing an acrylic pressure-sensitive adhesive, comprising the following steps: A hard core is obtained by mixing a hard monomer, a solvent, and a first initiator solution and carrying out a prepolymerization reaction; the hard monomer includes methyl methacrylate and vinyl acetate. The soft monomer and the functional monomer are mixed to obtain a monomer mixture. The monomer mixture and the second initiator solution are then dropped into the hard core to carry out a polymerization reaction, forming a soft segment coating layer and obtaining a polymerization product. The soft monomer includes butyl acrylate and isooctyl acrylate. The functional monomer includes acrylic acid, hydroxypropyl acrylate and isobornyl acrylate. The polymer product, tackifying resin, and crosslinking agent are mixed and subjected to a crosslinking reaction to obtain the acrylate pressure-sensitive adhesive.

[0007] Preferably, the step includes the following raw materials in parts by weight: 50-60 parts butyl acrylate, 20-30 parts isooctyl acrylate, 15-20 parts methyl methacrylate, 10-15 parts vinyl acetate, 2-5 parts acrylic acid, 1-3 parts hydroxypropyl acrylate, 3-5 parts isobornyl acrylate, 0.5-2 parts crosslinking agent, 10-15 parts tackifying resin, and 0.3-0.8 parts total initiator, wherein the total initiator includes the initiator in the first initiator solution and the initiator in the second initiator solution.

[0008] Preferably, the mass of the initiator in the first initiator solution is 1 / 3 to 1 / 2 of the total initiator mass.

[0009] Preferably, the tackifying resin comprises a hydrogenated terpene phenol resin.

[0010] Preferably, the crosslinking agent comprises an isocyanate trimer.

[0011] Preferably, the temperature of the prepolymerization reaction is 80~85℃ and the time is 1.5~2h.

[0012] Preferably, the polymerization reaction is carried out at a temperature of 85-88°C for 3-4 hours.

[0013] Preferably, after the crosslinking reaction is completed, the solid content is further adjusted to 30-35%.

[0014] The present invention also provides an acrylate pressure-sensitive adhesive prepared by the preparation method described in the above technical solution.

[0015] This invention also provides the application of the acrylate pressure-sensitive adhesive described above in precision electronics or automobile manufacturing.

[0016] This invention provides a method for preparing an acrylic pressure-sensitive adhesive, comprising the following steps: mixing a hard monomer, a solvent, and a first initiator solution for a prepolymerization reaction to obtain a hard core; the hard monomer includes methyl methacrylate and vinyl acetate; mixing a soft monomer and a functional monomer to obtain a monomer mixture; dripping the monomer mixture and a second initiator solution into the hard core for a polymerization reaction to form a soft segment coating layer, thereby obtaining a polymerization product; the soft monomer includes butyl acrylate and isooctyl acrylate; the functional monomer includes acrylic acid, hydroxypropyl acrylate, and isobornyl acrylate; the polymer product, a tackifying resin, and a crosslinking agent are mixed for a crosslinking reaction to obtain the acrylic pressure-sensitive adhesive.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The acrylic pressure-sensitive adhesive of the present invention has a core-shell structure in which soft segments encapsulate hard segments. Through a stepwise polymerization process, a core-shell structure with a hard monomer (high Tg) as the core and a soft monomer (low Tg) as the shell is obtained, which takes into account both flexibility and cohesive strength. IBOA acrylate is used as a functional monomer to enhance compatibility and high temperature resistance.

[0018] The advantages of the acrylic pressure-sensitive adhesive prepared by this invention are as follows: With balanced and superior performance, it breaks through traditional bottlenecks: Through a core-shell structure where soft segments encapsulate hard segments and synergistic crosslinking with functional monomers, it achieves a perfect balance between high peel strength (≥17.92 N / 25 mm) and high cohesive strength (holding time >72 h), while also solving the problem of residual adhesive. Compared with traditional pressure-sensitive adhesives, peel strength is increased by more than 30%, and holding time is doubled; Good interface compatibility and high bonding reliability: The structure of soft segment covering hard segment avoids direct exposure of hard segment. The addition of IBOA further enhances the compatibility of soft and hard segments, significantly improves the interface bonding effect, and can maintain stable bonding performance in long-term use and harsh environment, effectively reducing the risk of interface failure.

[0019] The process is simple and efficient, reducing production costs: The stepwise polymerization process of this invention does not require complex steps such as inorganic filler surface modification and sol-gel hybridization, nor does it require special post-treatment such as UV curing. The process steps are reduced, and only conventional acrylate monomers and crosslinking agents are used, reducing raw material costs by 20% to 30%. At the same time, it does not require special equipment such as UV irradiation machines and high-precision pH controllers, reducing equipment investment by more than 50%, which significantly improves the economics of industrial production. Detailed Implementation

[0020] This invention provides a method for preparing an acrylic pressure-sensitive adhesive, comprising the following steps: A hard core is obtained by mixing a hard monomer, a solvent, and a first initiator solution and carrying out a prepolymerization reaction; the hard monomer includes methyl methacrylate and vinyl acetate. The soft monomer and the functional monomer are mixed to obtain a monomer mixture. The monomer mixture and the second initiator solution are then dropped into the hard core to carry out a polymerization reaction, forming a soft segment coating layer and obtaining a polymerization product. The soft monomer includes butyl acrylate and isooctyl acrylate. The functional monomer includes acrylic acid, hydroxypropyl acrylate and isobornyl acrylate. The polymer product, tackifying resin, and crosslinking agent are mixed and subjected to a crosslinking reaction to obtain the acrylate pressure-sensitive adhesive.

[0021] Unless otherwise specified, all raw materials used in this invention are commercially available products in the field.

[0022] In this invention, the steps preferably include the following raw materials in parts by weight: 50-60 parts of butyl acrylate (specifically 50, 52, 55, 58, or 60 parts), 20-30 parts of isooctyl acrylate (specifically 20, 22, 25, 28, or 30 parts), 15-20 parts of methyl methacrylate (specifically 15, 16, 18, 19, or 20 parts), 10-15 parts of vinyl acetate (specifically 10, 11, 12, 14, or 15 parts), 2-5 parts of acrylic acid (specifically 2, 2.5, 3, 4, or 5 parts), and 1-5 parts of hydroxypropyl acrylate. 3 parts (specifically, 1, 1.5, 2, 2.5, or 3 parts), 3-5 parts isobornyl acrylate (specifically, 3, 3.5, 4, 4.5, or 5 parts), 0.5-2 parts crosslinking agent (specifically, 0.5, 0.8, 1.2, 1.8, or 2 parts), 10-15 parts tackifying resin (specifically, 10, 11, 12, 14, or 15 parts), and 0.3-0.8 parts total initiator (specifically, 0.3, 0.4, 0.5, 0.7, or 0.8 parts), wherein the total initiator includes the initiator in the first initiator solution and the initiator in the second initiator solution.

[0023] In this invention, the mass of the initiator in the first initiator solution is preferably 1 / 3 to 1 / 2 of the total initiator mass. If all the initiator is added at once, the free radical concentration will increase sharply, the polymerization rate of hard monomers (MMA / VAc) will be too fast, the size of the hard core particles formed will be uneven, and "bursting polymerization" will easily occur, resulting in a rough interface.

[0024] In this invention, the total initiator is preferably azobisisobutyronitrile.

[0025] In this invention, the tackifying resin preferably includes hydrogenated terpene phenol resin, preferably purchased from Guangxi Dinghong Resin Co., Ltd.

[0026] In this invention, the crosslinking agent preferably comprises an isocyanate trimer.

[0027] The present invention involves mixing a hard monomer, a solvent, and a first initiator solution to perform a prepolymerization reaction to obtain a hard core; the hard monomer includes methyl methacrylate and vinyl acetate.

[0028] In this invention, the stirring speed during the prepolymerization reaction stage is preferably 200~300 rpm, specifically 200, 250 or 300 rpm, to ensure uniform diffusion of hard monomers.

[0029] In this invention, the solvent is preferably an ethyl acetate-toluene mixture, and the volume ratio of ethyl acetate to toluene in the ethyl acetate-toluene mixture is preferably 3:1 to 4:1. This invention does not have a special limitation on the amount of solvent used, as long as it can ensure that the hard monomer and the first initiator solution are mixed evenly.

[0030] In this invention, the solvent of the first initiator solution preferably includes an ethyl acetate-toluene mixture, wherein the volume ratio of ethyl acetate to toluene in the ethyl acetate-toluene mixture is preferably 3:1 to 4:1. This invention does not impose any special limitation on the concentration of the first initiator solution.

[0031] In this invention, the temperature of the prepolymerization reaction is preferably 80~85℃, specifically 80, 81, 82, 83, 84 or 85℃, and the time is preferably 1.5~2h.

[0032] In this invention, the hard monomer and solvent are added to a reaction vessel, heated to the temperature of the prepolymerization reaction, and then the first initiator solution is added dropwise to initiate the prepolymerization reaction to obtain the hard core.

[0033] After the prepolymerization reaction, the resulting prepolymer product (i.e., the hard core) is preferably not processed, and the soft monomer, functional monomer, and second initiator solution are directly added dropwise into the hard core.

[0034] After obtaining the hard core, the present invention mixes the soft monomer and the functional monomer to obtain a monomer mixture, and then drips the monomer mixture and the second initiator solution into the hard core to carry out a polymerization reaction to form a soft segment coating layer and obtain a polymerization product; the soft monomer includes butyl acrylate and isooctyl acrylate; the functional monomer includes acrylic acid, hydroxypropyl acrylate and isobornyl acrylate.

[0035] In this invention, the solvent of the second initiator solution preferably includes an ethyl acetate-toluene mixture, wherein the volume ratio of ethyl acetate to toluene in the ethyl acetate-toluene mixture is preferably 2:1 to 3:1. This invention does not impose any special limitation on the concentration of the second initiator solution.

[0036] In this invention, the monomer mixture and the second initiator solution are preferably added in 3 to 4 batches according to the same mass. After each batch is added, the addition is preferably paused, the reaction is kept warm for 1 hour, and then the next batch is added.

[0037] In this invention, the dropping acceleration rate of the monomer mixture is preferably 10 times that of the dropping acceleration rate of the second initiator solution.

[0038] In this invention, the temperature of the polymerization reaction is preferably 85~88℃, specifically 85, 86, 87 or 88℃, and the time is preferably 3~4h. The time of the polymerization reaction is calculated from the time the droplet addition is completed.

[0039] In this invention, the stirring speed during the polymerization reaction is preferably 400-500 rpm, specifically 400, 450, or 500 rpm. After obtaining the polymerization product, the present invention mixes the polymerization product, tackifying resin and crosslinking agent to carry out a crosslinking reaction to obtain the acrylate pressure-sensitive adhesive.

[0040] In this invention, the polymer product is preferably cooled naturally to 50°C before the thickening resin and crosslinking agent are added to carry out the crosslinking reaction.

[0041] In this invention, the temperature of the crosslinking reaction is preferably room temperature, i.e., no additional heating or cooling is required, and the time is preferably the crosslinking reaction time.

[0042] In this invention, after the crosslinking reaction is completed, it is preferable to further adjust the solid content to 30-35%. This invention preferably uses a supplementary solvent, which is preferably an ethyl acetate-toluene mixture, wherein the volume ratio of ethyl acetate to toluene in the ethyl acetate-toluene mixture is preferably 2:1 to 4:1. In a specific embodiment of this invention, the solvent used in the prepolymerization reaction, the solvent in the first initiator solution, the solvent in the second initiator solution, and the supplementary solvent are used as the total solvent. By controlling the amount of the total solvent, the solid content of the acrylate pressure-sensitive adhesive is adjusted to 30-35%. In this invention, the solvent used in the prepolymerization reaction is preferably 30-35 wt% of the total solvent.

[0043] This invention also provides an acrylic pressure-sensitive adhesive prepared by the method described in the above technical solution. This invention, through a core-shell structure design where soft segments encapsulate hard segments, combined with functional monomers and crosslinking agents, achieves a significant improvement in overall performance, making it suitable for bonding needs in precision electronics and automotive manufacturing.

[0044] This invention also provides the application of the acrylate pressure-sensitive adhesive described above in precision electronics or automobile manufacturing.

[0045] The present invention does not impose any special limitation on the specific method of application, and any method known to those skilled in the art can be used.

[0046] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] In the embodiments and comparative examples of this invention, the amounts of raw materials used are all by mass. The volume ratio of ethyl acetate to toluene in the ethyl acetate-toluene mixture is 3:1. The hydrogenated terpene phenol resin was purchased from Guangxi Dinghong Resin Co., Ltd.

[0048] Testing standards: 1.180° Peel Strength: Referring to GB / T 2792-2014, with PET film (50μm) as the substrate, peel speed 300mm / min, 25℃, the average value of 3 tests was taken; 2. Holding time: Refer to GB / T 4851-2014, at 25℃ and with a 1kg load, record the time it takes for the displacement to reach 2.5mm; 3. Residual adhesive test: Refer to GB / T 2792-2014, and judge by visual inspection and pasting method.

[0049] Examples 1-5 The preparation method of acrylic pressure-sensitive adhesive includes the following steps: Step 1 (Hard Core Prepolymerization Stage): Add the hard monomers (methyl methacrylate and vinyl acetate) and 30wt% of the total solvent (ethyl acetate-toluene mixture) to the reactor, heat to 80℃, and dropwise add the first initiator solution (azobisisobutyronitrile solution, solvent is ethyl acetate-toluene mixture, the mass of the initiator in the first initiator solution is 1 / 3 of the total initiator mass) to initiate the prepolymerization reaction. During the prepolymerization reaction stage, the stirring speed is 250rpm, the hard monomers diffuse evenly, and a hard core is formed.

[0050] Step 2 (Soft Segment Coating Stage): The soft monomers (butyl acrylate and isooctyl acrylate) and functional monomers (acrylic acid, hydroxypropyl acrylate and isobornyl acrylate) are mixed to obtain a monomer mixture. The monomer mixture is added dropwise in four equal batches according to mass. The second initiator solution (azobisisobutyronitrile solution, solvent is ethyl acetate-toluene mixture, the mass of the initiator in the second initiator solution is 2 / 3 of the total initiator mass) is also added dropwise in four equal batches according to mass. Each batch of monomer mixture and second initiator solution is added simultaneously at a rate of 10:1. After each batch is added, the addition is paused and the reaction is kept at 85℃ for 1 hour before the next batch is added. After all batches are added, the reaction is continued at 85℃ for 4 hours to form a soft segment coating layer. The stirring speed during the polymerization stage is 450 rpm.

[0051] Step 3 (Post-processing stage): Cool to 50℃, add tackifying resin (hydrogenated terpene phenol resin) and crosslinking agent isocyanate trimer, disperse evenly, and adjust the solid content to 30% with ethyl acetate-toluene mixture to obtain acrylic pressure-sensitive adhesive.

[0052] The raw material amounts used in the preparation of acrylic pressure-sensitive adhesives in Examples 1-5 are shown in Table 1.

[0053] Table 1. Raw material amounts used in the preparation of acrylic pressure-sensitive adhesives in Examples 1-5

[0054] Comparative Examples 1-7 The raw material amounts used in the preparation of acrylic pressure-sensitive adhesives for Comparative Examples 1-7 are shown in Table 2.

[0055] Table 2. Raw material amounts used in the preparation of acrylic pressure-sensitive adhesives for Comparative Examples 1-7

[0056] The differences between the preparation methods of the comparative example and the embodiment are as follows: Comparative Example 1: All monomers (soft monomers, hard monomers and functional monomers) were mixed with solvent and added to the reactor at one time. The initiator solution was added dropwise in 3 batches at 85°C. After each batch was added, the addition was paused and the reaction was kept at 85°C for 1 hour before the next batch was added. After all batches were added, the reaction was kept at 85°C for 4 hours. The subsequent steps were the same as in Example 1 of this invention.

[0057] Comparative Example 2: The preparation steps are the same as in Example 1 of this invention.

[0058] Comparative Example 3: The order of adding soft and hard monomers was reversed. First, the soft monomer and 30wt% solvent were added to the reactor. The first initiator solution (azobisisobutyronitrile solution, solvent is ethyl acetate-toluene mixture, the mass of the initiator in the first initiator solution is 1 / 3 of the total initiator mass) was added dropwise at 80°C to initiate the prepolymerization reaction and form a soft core. Then, a mixture of hard monomers and functional monomers was added dropwise in 4 batches according to the mass ratio. The second initiator solution (azobisisobutyronitrile solution, solvent is ethyl acetate-toluene mixture, the mass of the initiator in the second initiator solution is 2 / 3 of the total initiator mass) was also added dropwise in 4 batches according to the mass ratio. Each batch of monomer mixture and second initiator solution was added simultaneously at a rate of 10:1. After each batch was added, the addition was paused, and the reaction was kept at 85°C for 1 hour before the next batch was added. After all batches were added, the reaction was kept at 85°C for 4 hours to form a hard segment coating layer. The subsequent steps were the same as in Example 1 of this invention.

[0059] Comparative Example 4: The formulation is the same as that of Example 1, except that all the initiators are added at once during the prepolymerization stage, and the rest of the process is the same as that of Example 1 of this invention.

[0060] Comparative Example 5: The formulation is the same as that of Example 1, except that the hard monomer is rapidly added to the first initiator solution within 10 minutes after mixing with the solvent during the prepolymerization stage. The rest of the process is the same as that of Example 1 of this invention.

[0061] Comparative Example 6: The preparation steps are the same as in Example 1 of this invention, except that the functional monomer IBOA is missing.

[0062] Comparative Example 7: The formulation is the same as that of Example 1, except that the stirring speed is 100 rpm during the prepolymerization reaction stage, and the monomer diffusion is uneven. The rest of the process is the same as that of Example 1 of this invention.

[0063] The performance tests of the acrylic pressure-sensitive adhesives prepared in the examples and comparative examples are shown in Table 3. It can be seen that the present invention achieves uniform control of the core-shell interface through key process design of stepwise initiator addition and precise monomer control. This results in a uniform soft segment coating layer that completely coats the hard core, avoiding the phenomenon that excessively fast reaction rates or uneven monomer diffusion during the prepolymerization stage can easily lead to core-shell interface defects, affecting the high-temperature residual adhesive performance. Specifically: 1. Initiator is added in batches at low concentrations to suppress a sudden increase in reaction rate. During the prepolymerization stage (hard core formation), only 1 / 3 of the total initiator mass is added, with the remaining 2 / 3 added simultaneously during the soft segment coating stage. If all the initiator is added at once, it will cause a sudden increase in free radical concentration, excessively fast polymerization rate of hard monomers, uneven size of the formed hard core particles, and a tendency for "explosive polymerization" to occur, resulting in a rough interface. In Comparative Example 4, the initiator was added all at once, causing the hard monomer polymerization rate to become uncontrolled. 2. During the prepolymerization reaction of hard monomers, the solvent is sufficiently diluted to ensure uniform monomer diffusion. During the prepolymerization stage, 30wt% of the total solvent is added simultaneously with the hard monomers. The solvent can reduce the concentration of hard monomers, slow down the frequency of molecular collisions, and avoid local monomer aggregation. At the same time, the stirring speed is controlled (200~300 rpm during the prepolymerization stage and 400~500 rpm during the polymerization stage) to ensure uniform monomer dispersion and prevent the hard core particles from breaking due to high-speed stirring. In Comparative Example 5, the rapid drop-addition of hard monomers led to uneven diffusion and local aggregation. In Comparative Example 7, insufficient stirring during the prepolymerization stage led to uneven diffusion and local aggregation of hard monomers.

[0064] Table 3. Performance test results of the acrylic pressure-sensitive adhesives prepared in the examples and comparative examples.

[0065] In summary, the advantages of the acrylic pressure-sensitive adhesive prepared by this invention are as follows: 1. Balanced and superior performance, breaking through traditional bottlenecks: Through a core-shell structure where soft segments encapsulate hard segments and synergistic crosslinking with functional monomers, a perfect balance is achieved between high peel strength (≥17.92 N / 25mm) and high cohesive strength (holding time >72h), while also solving the problem of residual adhesive. Compared with traditional pressure-sensitive adhesives, peel strength is increased by more than 30%, and holding time is doubled.

[0066] 2. Good interface compatibility and high bonding reliability: The structure of soft segment covering hard segment avoids direct exposure of hard segment. The addition of IBOA further enhances the compatibility of soft and hard segments, significantly improves the interface bonding effect, and can maintain stable bonding performance in long-term use and harsh environments, effectively reducing the risk of interface failure.

[0067] 3. Simple and efficient process, reducing production costs: The stepwise polymerization process of this invention does not require complex steps such as inorganic filler surface modification and sol-gel hybridization, nor does it require special post-treatment such as UV curing. The process steps are reduced, and only conventional acrylate monomers and crosslinking agents are used, which reduces raw material costs. At the same time, it does not require special equipment such as UV irradiation machines and high-precision pH controllers, which reduces equipment investment and significantly improves the economics of industrial production.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an acrylate pressure sensitive adhesive, characterized in that, The method comprises the following steps: mixing hard monomers, solvent and first initiator solution to carry out pre-polymerization reaction to obtain a hard core; the hard monomers comprise methyl methacrylate and vinyl acetate; mixing soft monomers and functional monomers to obtain a monomer mixture, and dropping the monomer mixture and second initiator solution into the hard core respectively to carry out polymerization reaction to form a soft segment coating layer, thereby obtaining a polymerization product; the soft monomers comprise butyl acrylate and isooctyl acrylate; the functional monomers comprise acrylic acid, hydroxypropyl acrylate and isobornyl acrylate; mixing the polymerization product, tackifying resin and crosslinking agent to carry out crosslinking reaction to obtain the acrylate pressure-sensitive adhesive.

2. The production method according to claim 1, characterized by, The step comprises the following mass fractions of raw materials: butyl acrylate 50-60 parts, isooctyl acrylate 20-30 parts, methyl methacrylate 15-20 parts, vinyl acetate 10-15 parts, acrylic acid 2-5 parts, hydroxypropyl acrylate 1-3 parts, isobornyl acrylate 3-5 parts, crosslinking agent 0.5-2 parts, tackifying resin 10-15 parts, and total initiator 0.3-0.8 parts, wherein the total initiator comprises initiators in the first initiator solution and initiators in the second initiator solution.

3. The preparation method according to claim 2, characterized in that, The mass of the initiator in the first initiator solution is 1 / 3-1 / 2 of the total mass of the initiators.

4. The production method according to claim 1 or 2, characterized by, The tackifying resin comprises hydrogenated terpene phenol resin.

5. The production method according to claim 1 or 2, characterized by, The crosslinking agent comprises isocyanate trimer.

6. The method of claim 1, wherein, The pre-polymerization reaction is carried out at a temperature of 80-85℃ for 1.5-2h.

7. The preparation method according to claim 1, characterized in that, The polymerization reaction is carried out at a temperature of 85-88℃ for 3-4h.

8. The method of claim 1, wherein, After the crosslinking reaction is completed, the solid content is further adjusted to 30-35%.

9. The acrylate pressure-sensitive adhesive prepared by the preparation method of any one of claims 1-8.

10. The acrylate pressure-sensitive adhesive of claim 9 for use in precision electronics or automobile manufacturing.

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