A solvent-based acrylate pressure-sensitive adhesive, and a preparation method and application thereof

Abstract

The application provides a solvent type acrylate pressure sensitive adhesive as well as a preparation method and application thereof, and raw materials of the solvent type acrylate pressure sensitive adhesive include soft acrylate monomers, hard acrylate monomers, functional monomers, modified talc, octaamino cage silsesquioxane, an initiator and a solvent; the octaamino cage silsesquioxane is used as a crosslinking agent, and further crosslinking of amino groups and acryl anhydride is helpful to improve the tack holding property of the pressure sensitive adhesive; meanwhile, the modified talc is added to improve the peel strength and high temperature resistance of the pressure sensitive adhesive; the modified talc can also produce a synergistic effect with the octaamino cage silsesquioxane to further improve the tack holding property of the pressure sensitive adhesive; and finally, the solvent type acrylate pressure sensitive adhesive with excellent peel strength, high temperature resistance and tack holding property is obtained.

Description

Technical Field

[0001] This invention belongs to the field of pressure-sensitive adhesive technology, specifically relating to a solvent-based acrylate pressure-sensitive adhesive, its preparation method, and its application. Background Technology

[0002] Pressure-sensitive adhesive (PSA), also known as pressure-sensitive glue, is a type of adhesive that is sensitive to pressure. It is a special type of adhesive that bonds without the need for heating, solvents, or other methods, requiring only slight pressure to achieve bonding. Generally, PSA is not used directly for bonding; it must be applied to a strip substrate to create various pressure-sensitive tape products. PSA tape consists of PSA, a substrate, a primer, and a backing agent. The PSA is the most important component, giving the tape its pressure-sensitive adhesive properties. Substrates used include fabrics, plastic films, and paper. The primer increases the bonding strength between the PSA and the substrate.

[0003] Pressure-sensitive adhesives can be classified into two categories based on their main resin composition: rubber-based and resin-based. Rubber-based adhesives can be further divided into natural rubber and synthetic rubber types; resin-based adhesives mainly include acrylic, silicone, and polyurethane types.

[0004] High-performance pressure-sensitive adhesives refer to products that have higher requirements than conventional pressure-sensitive adhesives in terms of special requirements such as adhesion, temperature resistance, warpage resistance, transparency, and weather resistance. They are typically used in fields such as the electronics industry, automotive industry, and manufacturing industry that require special bonding properties and the ability to maintain good bonding performance over a long period of time. Due to their cost and reliability characteristics, solvent-based acrylic pressure-sensitive adhesives are gradually replacing silicone and rubber-based systems in the field of high-performance pressure-sensitive adhesives.

[0005] CN108048006A discloses a solvent-based acrylic pressure-sensitive adhesive suitable for bonding TPU. This solvent-based acrylic pressure-sensitive adhesive is prepared from the following raw materials: 9-18 parts by weight of hard monomer, 31-37 parts by weight of soft monomer, 0.8-6 parts by weight of polar monomer, 0.6-4.5 parts by weight of polyether reactive emulsifier, 0.08-0.3 parts by weight of initiator, and a curing agent accounting for 1-5% of the total weight of the solvent-based acrylic pressure-sensitive adhesive. Although the solvent-based acrylic pressure-sensitive adhesive provided by this invention improves the bonding strength to TPU materials, it is too sensitive to temperature, exhibits poor tack at high temperatures, and leaves residue after peeling.

[0006] Therefore, in order to solve the above technical problems, it is necessary to develop a solvent-based acrylic pressure-sensitive adhesive with high peel strength and holding power, as well as excellent high-temperature resistance. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide a solvent-based acrylate pressure-sensitive adhesive, its preparation method and application. The solvent-based acrylate pressure-sensitive adhesive, through the reasonable combination of various components, has high peel strength, long holding time and excellent high temperature resistance.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a solvent-based acrylic pressure-sensitive adhesive, wherein the raw materials for preparing the solvent-based acrylic pressure-sensitive adhesive comprise the following components in parts by weight:

[0010]

[0011] The acrylic soft monomer can be 17 parts by weight, 19 parts by weight, 21 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, or 29 parts by weight, etc.

[0012] The acrylic hard monomer can be 16 parts by weight, 17 parts by weight, 18 parts by weight, or 19 parts by weight, etc.

[0013] The functional unit can be 10.5 parts by weight, 11 parts by weight, 11.5 parts by weight, 12 parts by weight, 12.5 parts by weight, 13 parts by weight, 13.5 parts by weight, 14 parts by weight, or 14.5 parts by weight, etc.

[0014] The modified talc powder can be 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, or 4.5 parts by weight, etc.

[0015] The octaaminocage-type silsesquioxane can be 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, or 4.5 parts by weight, etc.

[0016] The initiator can be 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, or 1.8 parts by weight, etc.

[0017] The solvent can be 12 parts by weight, 14 parts by weight, 16 parts by weight, or 18 parts by weight, etc.

[0018] The raw materials for preparing the solvent-based acrylic pressure-sensitive adhesive provided by this invention include soft acrylic monomers, hard acrylic monomers, functional monomers, modified talc, octaaminocage-type silsesquioxane, initiator, and solvent. On one hand, this invention uses octaaminocage-type silsesquioxane instead of conventional crosslinking agents, effectively avoiding the problem of reduced adhesive strength caused by conventional crosslinking agents, resulting in a longer holding time for the obtained solvent-based acrylic pressure-sensitive adhesive. Simultaneously, the further crosslinking effect between the amino groups in the octaaminocage-type silsesquioxane structure and acrylic anhydride also helps to improve the peel strength of the pressure-sensitive adhesive. On the other hand, this invention also adds modified talc to the raw materials, grafting talc into the pressure-sensitive adhesive. The surface of the talc has some active hydroxyl groups, which helps to increase the molecular polarity of the pressure-sensitive adhesive, enabling it to form a large number of hydrogen bonds with the substrate, improving its peel strength and further enhancing the adhesive strength. Furthermore, the high-temperature resistance of the talc also helps to improve the high-temperature resistance of the pressure-sensitive adhesive.

[0019] Preferably, the acrylic soft monomer comprises any one or a combination of at least two of n-butyl acrylate, isooctyl acrylate, or 2-ethylhexyl acrylate.

[0020] Preferably, the hard acrylic monomer comprises vinyl acetate and / or methyl methacrylate.

[0021] Preferably, the functional monomer includes any one or a combination of at least two of methacrylic acid, acrylic acid, itaconic acid, hydroxyethyl acrylate, or hydroxyethyl methacrylate.

[0022] Preferably, the modified talc is amino-modified talc.

[0023] As a preferred technical solution of the present invention, amino-modified talc can be selected to further synergize with octaaminocage-type silsesquioxane, and the amino groups shared by the two can be used to improve the crosslinking density and cohesive strength of the polymer.

[0024] Preferably, the amino-modified talc powder includes γ-aminopropyltriethoxysilane-modified talc powder and / or N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane-modified talc powder.

[0025] Preferably, the aminosilane coupling agent modified talc is obtained by mixing talc, aminosilane coupling agent and glacial acetic acid in a solvent.

[0026] As a preferred technical solution of the present invention, the ammonium salt formed by the reaction of aminosilane coupling agent and glacial acetic acid in the presence of glacial acetic acid improves the surface modification.

[0027] Preferably, the solvent includes any one or a combination of at least two of acetone, ethanol, or toluene.

[0028] Preferably, the mixing temperature is 60-70°C, such as 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, or 69°C.

[0029] Preferably, the mixing time is 4 to 12 hours, such as 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours or 11 hours.

[0030] Preferably, the octaaminocage-type silsesquioxane has the structure shown in Formula I:

[0031]

[0032] Wherein, R = CH2CH2CH2NH2.

[0033] Preferably, the initiator includes azo initiators and / or peroxide initiators.

[0034] Preferably, the azo initiator includes azobisisobutyronitrile (AIBN).

[0035] Preferably, the peroxide initiator includes benzoyl oxide.

[0036] Preferably, the solvent includes any one or a combination of at least two of acetone, ethyl acetate, toluene, xylene, or methyl ethyl ketone.

[0037] In a second aspect, the present invention provides a method for preparing a solvent-based acrylate pressure-sensitive adhesive as described in the first aspect, the method comprising the following steps:

[0038] (1) Modified talc powder and octaaminocage-type silsesquioxane are mixed in a partial solvent to obtain a mixture;

[0039] (2) Mix the soft acrylic monomer, hard acrylic monomer and functional monomer in the remaining solvent, add an initiator for prepolymerization, and then add the mixture obtained in step (1) for polymerization to obtain the solvent-based acrylate pressure-sensitive adhesive.

[0040] Preferably, the specific method of mixing in step (1) is as follows: dissolve the modified talc powder in a partial solvent, add an octaaminocage-type silsesquioxane, and mix at 20-30°C (e.g., 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, or 29°C, etc.) for 18-20 hours (e.g., 18.2 hours, 18.4 hours, 18.6 hours, 18.8 hours, 19 hours, 19.2 hours, 19.4 hours, 19.6 hours, or 19.8 hours, etc.) to obtain the mixture.

[0041] Preferably, step (2) specifically includes: mixing the soft acrylic monomer, hard acrylic monomer, and functional monomer in the remaining solvent; adding a portion of the initiator and prepolymerizing at 60–70°C (e.g., 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, or 69°C, etc.) for 0.5–1.5 h (e.g., 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, 1.1 h, 1.2 h, 1.3 h, or 1.4 h, etc.); then adding another portion of the initiator and prepolymerizing at 60–70°C (e.g., 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, or 69°C, etc.) for 0.5–1.5 h (e.g., 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, 1.1 h, 1.2 h, 1.3 h, or 1.4 h, etc.); and then adding another portion of the initiator and prepolymerizing at 60–70°C (e.g., 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 69°C, etc.). Prepolymerize at 7℃, 68℃ or 69℃ for 0.5 to 1.5 hours (e.g., 0.6 hours, 0.7 hours, 0.8 hours, 0.9 hours, 1 hour, 1.1 hours, 1.2 hours, 1.3 hours or 1.4 hours, etc.), and finally add the mixture obtained in step (1) dropwise. After the dropwise addition is completed, heat to 70 to 75℃ (e.g., 70.5℃, 71℃, 71.5℃, 72℃ or 72.5℃, etc.) and polymerize for 4 to 6 hours (e.g., 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5 hours, 5.2 hours, 5.4 hours, 5.6 hours or 5.8 hours, etc.) to obtain the solvent-based acrylate pressure-sensitive adhesive.

[0042] Thirdly, the present invention provides an application of the solvent-based acrylate pressure-sensitive adhesive as described in the first aspect in electronic products.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) The raw materials for preparing solvent-based acrylic pressure-sensitive adhesive provided by the present invention include a specific number of soft acrylic monomers, hard acrylic monomers, functional monomers, modified talc powder, octaaminocage-type silsesquioxane, initiator and solvent combination. By adding octaaminocage-type silsesquioxane and modified talc powder to the raw materials, the pressure-sensitive adhesive obtained has both high peel strength and holding power, and also has excellent high temperature resistance.

[0045] (2) By further optimizing the type of modified talc powder, the present invention enables it to synergize with octaaminocage-type silsesquioxane, so that the final solvent-based acrylate pressure-sensitive adhesive not only has excellent peel strength, but also excellent tack and high temperature resistance. Specifically, the peel strength is 13.4~14.2N / 25mm, the high temperature tack is >100h, and there is no adhesive residue after peeling. Detailed Implementation

[0046] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention.

[0047] Preparation Example 1

[0048] An amino-modified talc powder is prepared by mixing 10g of talc powder, 2g of γ-aminopropyltriethoxysilane and 10g of glacial acetic acid in anhydrous ethanol at 65°C for 8h, filtering and drying to obtain the amino-modified talc powder.

[0049] Preparation Example 2

[0050] An amino-modified talc powder is prepared by mixing 10g of talc powder, 2g of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and 10g of glacial acetic acid in anhydrous ethanol for 10h at 60℃, filtering and drying to obtain the amino-modified talc powder.

[0051] Preparation Example 3

[0052] An amino-modified talc powder, which differs from Preparation Example 1 only in that glacial acetic acid is not added, while the other substances, amounts and preparation methods are the same as those in Preparation Example 1.

[0053] Preparation Example 4

[0054] A modified talc powder, which differs from Preparation Example 1 only in that γ-aminopropyltriethoxysilane is replaced with γ-glycidoxypropyltrimethoxysilane, while the other substances, amounts and preparation methods are the same as those in Preparation Example 1.

[0055] Example 1

[0056] A solvent-based acrylic pressure-sensitive adhesive, the raw materials for which are prepared include the following components in parts by weight:

[0057]

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

[0059] (1) Dissolve amino-modified talc powder (Preparation Example 1) in 5 parts by weight of ethyl acetate, add octaaminocage-type silsesquioxane and mix at 25°C for 18 h to obtain a mixture.

[0060] (2) Mix n-butyl acrylate, methyl acrylate and methacrylic acid evenly in the remaining 10 parts by weight of ethyl acetate, add 0.5 parts by weight of azobisisobutyronitrile and prepolymerize at 65°C for 1 hour, then add 1 part by weight of azobisisobutyronitrile and continue prepolymerizing at 65°C for 1 hour, and finally drop the mixture obtained in step (1) over a period of 30 minutes. After the drop is completed, heat to 75°C and polymerize for 4 hours to obtain the solvent-based acrylate pressure-sensitive adhesive.

[0061] Example 2

[0062] A solvent-based acrylic pressure-sensitive adhesive, the raw materials for which are prepared include the following components in parts by weight:

[0063]

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

[0065] (1) Dissolve amino-modified talc powder (Preparation Example 2) in 3 parts by weight of ethyl acetate, add octaaminocage-type silsesquioxane and mix at 25°C for 18 h to obtain a mixture.

[0066] (2) Mix n-butyl acrylate, methyl acrylate and methacrylic acid in 7 parts by weight of ethyl acetate, add 0.3 parts by weight of azobisisobutyronitrile and prepolymerize at 65°C for 1 hour, then add 0.7 parts by weight of azobisisobutyronitrile and continue prepolymerizing at 65°C for 1 hour. Finally, add the mixture obtained in step (1) dropwise for 30 minutes. After the dropwise addition is completed, heat to 75°C and polymerize for 4 hours to obtain the solvent-based acrylate pressure-sensitive adhesive.

[0067] Example 3

[0068] A solvent-based acrylic pressure-sensitive adhesive, the raw materials for which are prepared include the following components in parts by weight:

[0069]

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

[0071] (1) Dissolve amino-modified talc powder (Preparation Example 1) in 5 parts by weight of ethyl acetate, add octaaminocage-type silsesquioxane and mix at 25°C for 18 h to obtain a mixture.

[0072] (2) Mix n-butyl acrylate, methyl acrylate and methacrylic acid in 15 parts by weight of ethyl acetate, add 0.5 parts by weight of benzoyl peroxide and prepolymerize at 65°C for 1 hour, then add 1.5 parts by weight of benzoyl peroxide and continue prepolymerizing at 65°C for 1 hour, and finally add the mixture obtained in step (1) dropwise for 30 minutes. After the dropwise addition is completed, heat to 75°C and polymerize for 4 hours to obtain the solvent-based acrylate pressure-sensitive adhesive.

[0073] Example 4

[0074] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that the amino-modified talc provided in Preparation Example 3 is used instead of the amino-modified talc provided in Preparation Example 1. All other components, dosages, and preparation methods are the same as in Example 1.

[0075] Example 5

[0076] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that the modified talc provided in Preparation Example 4 is used instead of the amino-modified talc provided in Preparation Example 1, while the other components, dosages, and preparation methods are the same as in Example 1.

[0077] Comparative Example 1

[0078] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that unmodified talc is used instead of the amino-modified talc provided in Preparation Example 1; all other components, amounts, and preparation methods are the same as in Example 1.

[0079] Comparative Example 2

[0080] A solvent-based acrylic pressure-sensitive adhesive differs from Example 1 only in that it does not contain amino-modified talc; all other components, dosages, and preparation methods are the same as in Example 1.

[0081] Comparative Example 3

[0082] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that the amount of amino-modified talc added is 6 parts by weight, while the other components, amounts, and preparation methods are the same as in Example 1.

[0083] Comparative Example 4

[0084] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that it does not contain octaaminocage-type silsesquioxane; all other components, dosages, and preparation methods are the same as in Example 1.

[0085] Comparative Example 5

[0086] A solvent-based acrylate pressure-sensitive adhesive differs from Example 1 only in that the amount of octaaminocage-type silsesquioxane added is 6 parts by weight, while the other components, dosages, and preparation methods are the same as in Example 1.

[0087] Performance testing:

[0088] Using a 40μm scraper, the solvent-based acrylic pressure-sensitive adhesive is applied to the PET release paper, with the thickness controlled at 20μm. It is dried at 90℃ for 5 minutes, then removed and pressed onto the release PET. It is then placed in a 55℃ oven for 72 hours to cure before use.

[0089] (1) Peel strength: The test shall be conducted in accordance with the test method provided in GB / T 2792;

[0090] (2) High temperature tackiness: The test shall be conducted in accordance with the test method provided in GB / T 4851;

[0091] (3) Residual adhesive: Press the pressure-sensitive tape onto a smooth 304 stainless steel plate, roll it back and forth 3 times with a 2kg roller, place it at 220℃ for 5 hours, and then let it cool naturally. Remove the pressure-sensitive tape and observe whether there is any residual adhesive on the stainless steel plate.

[0092] The solvent-based acrylic pressure-sensitive adhesives provided in Examples 1-5 and Comparative Examples 1-5 were tested according to the above test methods. The test results are shown in Table 1.

[0093] Table 1

[0094] Peel strength (N / 25mm) High temperature (60℃) tackiness / h Residual adhesive Example 1 14.2 ＞100 No residue Example 2 13.4 ＞100 No residue Example 3 13.6 ＞100 No residue Example 4 12.2 ＞100 No residue Example 5 11.3 98 No residue Comparative Example 1 6.5 86 Small amount of residual glue Comparative Example 2 5.3 63 There is residual glue Comparative Example 3 8.9 71 No residue Comparative Example 4 6.1 81 There is residual glue Comparative Example 5 11.3 92 There is residual glue

[0095] According to the data in Table 1:

[0096] The solvent-based acrylic pressure-sensitive adhesives provided in Examples 1-3 not only have excellent peel strength, but also excellent tack and high-temperature resistance. Specifically, the peel strength is 13.4-14.2 N / 25 mm, the high-temperature tack is >100 h, and there is no adhesive residue after peeling.

[0097] The peel strength and tack of the pressure-sensitive adhesive prepared using unmodified talc in Comparative Example 1 were significantly reduced, indicating that the tack-enhancing effect of the modified talc was significantly better.

[0098] Comparative Example 2 shows that the pressure-sensitive adhesive without added talc has the worst peel strength and tack, because the polyacrylate molecules themselves have low adhesion to the substrate due to their lack of modification.

[0099] The excessive amount of amino-modified talc added in Comparative Example 3 also reduces the peel strength and tack of the pressure-sensitive adhesive. This is because as the amount of talc added increases, the physical cross-linking degree of the polyacrylate molecular chain increases, resulting in poorer molecular chain mobility, which is not conducive to the adhesion between the pressure-sensitive adhesive and the substrate, and thus reduces both tack and 180° peel strength.

[0100] Comparative Example 4, without the addition of octaaminocage-type silsesquioxane, showed poor peel strength and tackiness of the pressure-sensitive adhesive. This is because it is unable to form an effective cross-linking structure, which in turn leads to a decrease in tackiness.

[0101] In Comparative Example 5, excessive addition of octaaminocage-type silsesquioxane also leads to an increase in the degree of cross-linking of polyacrylate molecular chains, which in turn results in poorer molecular chain mobility, ultimately causing a decrease in the tack and peel strength of the pressure-sensitive adhesive.

[0102] Compared to Example 1, the holding time and peel strength of the pressure-sensitive adhesives provided in Examples 4 and 5 also decreased. This indicates that different types of modified talc will have different effects. Only the amino-modified talc specified in this application can produce the same effect with the octaaminocage-type silsesquioxane, which can significantly improve the bonding performance and high-temperature resistance of the pressure-sensitive adhesive.

[0103] The applicant declares that this invention illustrates a solvent-based acrylate pressure-sensitive adhesive, its preparation method, and its application through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

Claims

1. A solvent-based acrylic pressure-sensitive adhesive, characterized in that, The raw materials for preparing the solvent-soluble acrylate pressure-sensitive adhesive include the following components in parts by weight: The modified talc is amino-modified talc. The amino-modified talc powder includes γ-aminopropyltriethoxysilane-modified talc powder and / or N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane-modified talc powder; The amino-modified talc powder is obtained by mixing talc powder, aminosilane coupling agent and glacial acetic acid in a solvent.

2. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The acrylic soft monomer includes any one or a combination of at least two of n-butyl acrylate, isooctyl acrylate, or 2-ethylhexyl acrylate.

3. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The acrylic hard monomers include methyl acrylate and / or methyl methacrylate.

4. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The functional monomers include any one or a combination of at least two of methacrylic acid, acrylic acid, itaconic acid, hydroxyethyl acrylate, or hydroxyethyl methacrylate.

5. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The solvent includes any one or a combination of at least two of acetone, ethanol, or toluene.

6. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The mixing temperature is 60–70°C.

7. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The mixing time is 4 to 12 hours.

8. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The octaaminocage-type silsesquioxane has the structure shown in Formula I: Wherein, R = CH2CH2CH2NH2.

9. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The initiator includes azo initiators and / or peroxide initiators.

10. The solvent-based acrylate pressure-sensitive adhesive according to claim 9, characterized in that, The azo initiator includes azobisisobutyronitrile.

11. The solvent-based acrylate pressure-sensitive adhesive according to claim 9, characterized in that, The peroxide initiator includes benzoyl peroxide.

12. The solvent-based acrylate pressure-sensitive adhesive according to claim 1, characterized in that, The solvent includes any one or a combination of at least two of acetone, ethyl acetate, toluene, xylene, or methyl ethyl ketone.

13. A method for preparing a solvent-based acrylate pressure-sensitive adhesive as described in any one of claims 1 to 12, characterized in that, The preparation method includes the following steps: (1) Modified talc powder and octaaminocage-type silsesquioxane are mixed in a partial solvent to obtain a mixture; (2) Mix the soft acrylic monomer, hard acrylic monomer and functional monomer in the remaining solvent, add an initiator for prepolymerization, and then add the mixture obtained in step (1) for polymerization to obtain the solvent-based acrylate pressure-sensitive adhesive.

14. The preparation method according to claim 13, characterized in that, The specific method of mixing in step (1) is as follows: dissolve the modified talc powder in part of the solvent, add octaaminocage-type silsesquioxane, and mix at 20-30°C for 18-20 hours to obtain the mixture.

15. The preparation method according to claim 13, characterized in that, Step (2) specifically includes: mixing the soft acrylic monomer, hard acrylic monomer and functional monomer in the remaining solvent, adding a portion of the initiator and prepolymerizing at 60-70°C for 0.5-1.5h, then adding the remaining initiator and prepolymerizing at 60-70°C for 0.5-1.5h, and finally adding the mixture obtained in step (1) dropwise. After the dropwise addition is completed, the temperature is raised to 70-75°C and polymerized for 4-6h to obtain the solvent-based acrylic pressure-sensitive adhesive.

16. The application of a solvent-based acrylate pressure-sensitive adhesive as described in any one of claims 1 to 12 in electronic products.

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