An acrylate pressure sensitive adhesive, its preparation method and use

Abstract

The application provides an acrylic ester pressure-sensitive adhesive as well as a preparation method and application thereof, and raw materials of the acrylic ester pressure-sensitive adhesive include isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, inorganic nanoparticles, a photoinitiator and a chain transfer agent. Dopamine methacrylamide is used to introduce catechol groups into molecular chains of the acrylic ester pressure-sensitive adhesive, so that the cohesive strength of the pressure-sensitive adhesive is increased, and then the bonding strength of the pressure-sensitive adhesive is increased. The acrylic ester pressure-sensitive adhesive has high peeling strength, and the preparation route is simple, efficient and green.

Description

Technical Field

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

[0002] Pressure-sensitive adhesives (PSAs) are adhesives that are sensitive to pressure. When applied with appropriate pressure, they adhere to other surfaces. Due to their unique adhesive properties, PSAs are widely used in printing, packaging, and other industries. UV-curable PSAs are a new type of energy-saving and environmentally friendly adhesive, characterized by fast curing speed, low energy consumption, no pollution, and good water and heat resistance. UV-curable PSAs overcome the drawbacks of solvent-based PSAs (severe pollution) and water-based PSAs (poor water resistance and high energy consumption), as well as the aging and high-temperature resistance of hot-melt PSAs. To improve the adhesive strength and other properties of PSAs, modification of acrylic PSAs is necessary.

[0003] CN 111440586 A discloses an environmentally friendly, high-strength UV-curable acrylate pressure-sensitive adhesive and its preparation method. The environmentally friendly, high-strength UV-curable acrylate pressure-sensitive adhesive is prepared by weight-based methods using 30-70 parts of nano-modified polyurethane acrylate oligomer, 30-70 parts of reactive diluent, 1-3 parts of adhesion promoter, and 0.2-5 parts of photoinitiator. This technical solution significantly improves peel strength by introducing hydroxyl-containing nanoparticles and adhesion promoters; however, the peel strength of the acrylate pressure-sensitive adhesive still needs further improvement.

[0004] CN108384507A discloses a UV-curable adhesive with high bonding strength and its preparation method. The UV-curable adhesive comprises the following components by mass percentage: 30-60% polyurethane acrylate, 10-30% methacrylate monomers, 1-6% photoinitiator, 0.5-3% silane coupling agent, 1-10% adhesion promoter, and 10-40% filler. This technical solution, by adding self-made solvent-free polyurethane acrylate, silane coupling agent, and adhesion promoter to the raw materials, significantly improves the bonding strength of the UV-curable adhesive while reducing costs and ensuring excellent performance. However, the preparation process of the UV-curable adhesive is relatively complex.

[0005] CN107987783A discloses a method for preparing a high-adhesion-strength heat-resistant UV-curable adhesive. The high-adhesion-strength heat-resistant UV-curable adhesive uses polyurethane acrylate as a matrix, tetrahydrofuran acrylate and isobornyl acrylate mixed as diluent monomers, self-made nano silica powder, and self-made reactants to prepare the UV-curable adhesive. Snail slime and silane coupling agent are used to jointly modify tetrahydrofuran acrylate, isobornyl acrylate, and 1-hydroxycyclohexylphenyl ketone, thereby enhancing the adhesion strength of the UV-curable adhesive to the material. However, the preparation process is complex and not suitable for large-scale industrial production.

[0006] Therefore, there is a need to develop an acrylic pressure-sensitive adhesive that is pollution-free, has a simple preparation process, and high bonding strength. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide an acrylic pressure-sensitive adhesive, its preparation method, and its applications. The acrylic pressure-sensitive adhesive of the present invention exhibits high peel strength, a simple preparation route, high reaction efficiency, and is environmentally friendly.

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

[0009] In a first aspect, the present invention provides an acrylate pressure-sensitive adhesive, wherein the raw materials for preparing the acrylate pressure-sensitive adhesive include isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, inorganic nanoparticles, photoinitiator and chain transfer agent.

[0010] In this invention, the acrylate pressure-sensitive adhesive is prepared by compounding isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, and inorganic nanoparticles. Isooctyl acrylate primarily provides the adhesive strength of the acrylate pressure-sensitive adhesive; acrylic acid improves the cohesive strength of the acrylate pressure-sensitive adhesive, imparting flexibility and extensibility; dopamine methacrylamide introduces catechol groups into the molecular chain of the acrylate pressure-sensitive adhesive, increasing crosslinking and adhesion. Furthermore, both hydroxyethyl acrylate and dopamine methacrylamide can form hydrogen bonds with acrylic acid, increasing the cohesive strength of the acrylate pressure-sensitive adhesive and thus enhancing its adhesive performance, exhibiting a synergistic effect; the chain transfer agent effectively reduces the possibility of explosive polymerization.

[0011] Preferably, the inorganic nanoparticles include inorganic nanoparticles modified with silane coupling agents.

[0012] Preferably, the silane coupling agent comprises acryloyloxypropyltrimethoxysilane.

[0013] In this invention, inorganic nanoparticles are surface modified with acryloyloxypropyltrimethoxysilane to form grafting reaction sites with terminal double bonds on their surface. When these sites react with acrylate monomers, a grafting reaction occurs, thereby strengthening the interfacial bonding between inorganic and organic materials and improving the crosslinking degree of the acrylate pressure-sensitive adhesive. While improving the crosslinking degree of the acrylate pressure-sensitive adhesive, it also provides some rigid stress-bearing points, thus improving the adhesive and mechanical properties of the acrylate pressure-sensitive adhesive.

[0014] Preferably, the inorganic nanoparticles include silicon dioxide and graphene oxide.

[0015] In this invention, by using a combination of silica and graphene oxide, the crosslinking degree of the acrylate pressure-sensitive adhesive is improved. The silica and graphene oxide also serve as rigid stress-bearing points, further enhancing the adhesive performance of the acrylate pressure-sensitive adhesive.

[0016] Preferably, the inorganic nanoparticles have a particle size of 5-20 nm, such as 5 nm, 8 nm, 10 nm, 12 nm, 14 nm, 15 nm, 16 nm, 18 nm, or 20 nm.

[0017] Preferably, the graphene oxide has a particle size of 15-50 nm, such as 15 nm, 18 nm, 20 nm, 25 nm, 28 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm.

[0018] Preferably, the photoinitiator comprises any one or a combination of at least two of the following: 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0019] Preferably, the chain transfer agent comprises dodecyl mercaptan.

[0020] Preferably, the raw materials for preparing the acrylate pressure-sensitive adhesive include the following components in parts by weight: 70-80 parts of isooctyl acrylate, 15-20 parts of acrylic acid, 3-4 parts of hydroxyethyl acrylate, 5-10 parts of dopamine methacrylamide, 0.5-1 parts of inorganic nanoparticles, 1-3 parts of photoinitiator, and 2-4 parts of chain transfer agent.

[0021] The weight parts of isooctyl acrylate can be 70, 72, 73, 74, 75, 76, 77, 78, 79 or 80 parts, etc.

[0022] The acrylic acid can be in parts by weight of 15, 16, 17, 18, 19, or 20 parts, etc.

[0023] The weight parts of the hydroxyethyl acrylate can be 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, or 4 parts, etc.

[0024] The weight percentages of the dopamine methacrylamide can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, or 10 parts, etc.

[0025] The inorganic nanoparticles can be present in weight fractions of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1 part, etc.

[0026] The photoinitiator can be expressed in parts by weight of 1, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, or 3 parts, etc.

[0027] The chain transfer agent can be expressed in parts by weight of 2, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, or 4 parts, etc.

[0028] In a second aspect, the present invention provides a method for preparing acrylate pressure-sensitive adhesive as described in the first aspect, the method comprising the following steps: mixing isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, inorganic nanoparticles, photoinitiator and chain transfer agent, and irradiating with ultraviolet light to obtain the acrylate pressure-sensitive adhesive.

[0029] Preferably, the ultraviolet light irradiation is carried out in a nitrogen atmosphere.

[0030] Preferably, the ultraviolet light irradiation time is 10-30s, such as 10s, 12s, 14s, 16s, 18s, 20s, 24s, 26s, 28s or 30s.

[0031] Thirdly, the present invention provides a pressure-sensitive adhesive tape, the pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive as described in the first aspect.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The acrylate pressure-sensitive adhesive of this invention is prepared by compounding isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, and inorganic nanoparticles, and then curing it under ultraviolet light. It is cross-linked and cured by ultraviolet light, which has the characteristics of simple preparation route, high reaction efficiency and green environmental protection. The acrylate pressure-sensitive adhesive obtained has high bonding strength and peel strength can reach 38-55N / 25mm. In the preferred case, the peel strength is 50-55N / 25mm. Detailed Implementation

[0034] 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 in any way.

[0035] Example 1

[0036] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The raw materials for preparing the acrylate pressure-sensitive adhesive include the following components in parts by weight: 70 parts of isooctyl acrylate, 20 parts of acrylic acid, 3.5 parts of hydroxyethyl acrylate, 8 parts of dopamine methacrylamide, 0.8 parts of inorganic nanoparticles, 1 part of 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone, and 2 parts of dodecyl mercaptan.

[0037] The inorganic nanoparticles are silica modified with silane coupling agent (silica particle size is 20 nm) and graphene oxide modified with silane coupling agent (graphene particle size is 15 nm) in a mass ratio of 2:1.

[0038] The preparation method of the above-mentioned silane coupling agent modified silica is as follows:

[0039] Silica (particle size 20 nm) was dispersed in anhydrous ethanol to prepare a 50% silica anhydrous ethanol dispersion, which was then sonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% by weight of silica) was weighed and dispersed in anhydrous ethanol to prepare a 10% acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above silica anhydrous ethanol dispersion was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified silica.

[0040] The preparation method of the above-mentioned silane coupling agent modified graphene is as follows:

[0041] Graphene oxide (particle size 15 nm) was dispersed in anhydrous ethanol to prepare a 50% (w / w) anhydrous ethanol dispersion of graphene oxide, and ultrasonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% (w / w) of graphene oxide) was weighed and dispersed in anhydrous ethanol to prepare a 10% (w / w) anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above anhydrous ethanol dispersion of graphene oxide was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified graphene oxide.

[0042] The preparation method of the acrylate pressure-sensitive adhesive is as follows:

[0043] (1) Mix isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide and inorganic nanoparticles and stir until the mixture is uniform. Then add dodecyl mercaptan and 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone and continue stirring to obtain a mixture.

[0044] (2) Nitrogen gas is introduced into the mixture obtained in step (1). After the mixture is filled with nitrogen, the ultraviolet lamp is turned on with a wavelength of 365nm and a power of 50W. After irradiation for 20s, the ultraviolet lamp is turned off, and then stirring is continued for 1h. Finally, the mixture is cooled to room temperature to obtain the acrylic pressure-sensitive adhesive.

[0045] Example 2

[0046] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The raw materials for preparing the acrylate pressure-sensitive adhesive include the following components in parts by weight: 75 parts of isooctyl acrylate, 18 parts of acrylic acid, 3 parts of hydroxyethyl acrylate, 10 parts of dopamine methacrylamide, 0.5 parts of inorganic nanoparticles, 2 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 3 parts of dodecyl mercaptan.

[0047] The inorganic nanoparticles are silane coupling agent modified silica (silica particle size is 5 nm) and silane coupling agent modified graphene oxide (graphene particle size is 50 nm) in a mass ratio of 1:1.

[0048] The preparation method of the above-mentioned silane coupling agent modified silica is as follows:

[0049] Silica (particle size 5 nm) was dispersed in anhydrous ethanol to prepare a 50% silica anhydrous ethanol dispersion, which was then sonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% by weight of silica) was weighed and dispersed in anhydrous ethanol to prepare a 10% acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above silica anhydrous ethanol dispersion was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified silica.

[0050] The preparation method of the above-mentioned silane coupling agent modified graphene is as follows:

[0051] Graphene oxide (particle size 50 nm) was dispersed in anhydrous ethanol to prepare a 50% (w / w) anhydrous ethanol dispersion of graphene oxide, and ultrasonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% (w / w) of graphene oxide) was weighed and dispersed in anhydrous ethanol to prepare a 10% (w / w) anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above anhydrous ethanol dispersion of graphene oxide was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified graphene oxide.

[0052] The preparation method of the acrylate pressure-sensitive adhesive is as follows:

[0053] (1) Mix isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide and inorganic nanoparticles and stir until the mixture is uniform. Then add dodecyl mercaptan and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and continue stirring to obtain a mixture.

[0054] (2) Nitrogen gas is introduced into the mixture obtained in step (1). After the mixture is filled with nitrogen, the ultraviolet lamp is turned on with a wavelength of 365nm and a power of 50W. After irradiation for 30s, the ultraviolet lamp is turned off, and then stirring is continued for 1h. Finally, the mixture is cooled to room temperature to obtain the acrylic pressure-sensitive adhesive.

[0055] Example 3

[0056] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The raw materials for preparing the acrylate pressure-sensitive adhesive include the following components in parts by weight: 80 parts of isooctyl acrylate, 15 parts of acrylic acid, 4 parts of hydroxyethyl acrylate, 5 parts of dopamine methacrylamide, 1 part of inorganic nanoparticles, 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 4 parts of dodecyl mercaptan.

[0057] The inorganic nanoparticles are silica modified with silane coupling agent (silica particle size is 10 nm) and graphene oxide modified with silane coupling agent (graphene particle size is 25 nm) in a mass ratio of 2:1.

[0058] The preparation method of the above-mentioned silane coupling agent modified silica is as follows:

[0059] Silica (particle size 10 nm) was dispersed in anhydrous ethanol to prepare a 50% silica anhydrous ethanol dispersion, which was then sonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% by weight of silica) was weighed and dispersed in anhydrous ethanol to prepare a 10% acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above silica anhydrous ethanol dispersion was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above acryloyloxypropyltrimethoxysilane anhydrous ethanol dispersion was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified silica.

[0060] The preparation method of the above-mentioned silane coupling agent modified graphene is as follows:

[0061] Graphene oxide (particle size 25 nm) was dispersed in anhydrous ethanol to prepare a 50% (w / w) anhydrous ethanol dispersion of graphene oxide, and ultrasonicated for 30 min. Acryloyloxypropyltrimethoxysilane (5% (w / w) of graphene oxide) was weighed and dispersed in anhydrous ethanol to prepare a 10% (w / w) anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane. The pH was adjusted to 4 with dilute hydrochloric acid while stirring. All of the above anhydrous ethanol dispersion of graphene oxide was added to a reactor purged with cooling water and nitrogen, and stirred in a 50°C water bath. Then, the above anhydrous ethanol dispersion of acryloyloxypropyltrimethoxysilane was added dropwise over 60 min. The reaction was continued at this temperature for 20 h, followed by centrifugation. The lower layer of paste was washed and dried under vacuum at 60°C to obtain silane coupling agent modified graphene oxide.

[0062] The preparation method of the acrylate pressure-sensitive adhesive is as follows:

[0063] (1) Mix isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide and inorganic nanoparticles and stir until the mixture is uniform. Then add dodecyl mercaptan and 2-hydroxy-2-methyl-1-phenyl-1-propanone and continue stirring to obtain a mixture.

[0064] (2) Nitrogen gas is introduced into the mixture obtained in step (1). After the mixture is filled with nitrogen, the ultraviolet lamp is turned on with a wavelength of 365nm and a power of 50W. After irradiation for 10s, the ultraviolet lamp is turned off, and then stirring is continued for 1h. Finally, the mixture is cooled to room temperature to obtain the acrylic pressure-sensitive adhesive.

[0065] Example 4

[0066] This embodiment provides an acrylic pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that the weight of dopamine methacrylamide is adjusted to 3 parts, while the other raw materials, dosages and preparation methods are the same as in Example 1.

[0067] Example 5

[0068] This embodiment provides an acrylic pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that the weight of hydroxyethyl acrylate is adjusted to 2 parts, while the other raw materials, dosages, and preparation methods are the same as in Example 1.

[0069] Example 6

[0070] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that the weight of inorganic nanoparticles is adjusted to 0.2 parts, while the other raw materials, dosages, and preparation methods are the same as in Example 1.

[0071] Example 7

[0072] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that the weight of inorganic nanoparticles is adjusted to 2 parts, while the other raw materials, dosages, and preparation methods are the same as in Example 1.

[0073] Example 8

[0074] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that, while keeping the inorganic nanoparticle content unchanged, all inorganic nanoparticles are replaced with silane coupling agent-modified graphene oxide. Other raw materials, dosages, and preparation methods are the same as in Example 1.

[0075] Example 9

[0076] This embodiment provides an acrylate pressure-sensitive adhesive and its preparation method. The only difference between this embodiment and Example 1 is that, while keeping the inorganic nanoparticle content unchanged, all inorganic nanoparticles are replaced with silane coupling agent modified silica. Other raw materials, dosages, and preparation methods are the same as in Example 1.

[0077] Comparative Example 1

[0078] This comparative example provides an acrylic pressure-sensitive adhesive and its preparation method. The only difference between this example and Example 1 is that hydroxyethyl acrylate is not added, and the weight of dopamine methacrylamide is adjusted to 11.5 parts. Other raw materials, dosages, and preparation methods are the same as in Example 1.

[0079] Comparative Example 2

[0080] This comparative example provides an acrylic pressure-sensitive adhesive and its preparation method. The only difference between this example and Example 1 is that dopamine methacrylamide is not added, and the weight of hydroxyethyl acrylate is adjusted to 11.5 parts. Other raw materials, dosages, and preparation methods are the same as in Example 1.

[0081] The acrylic pressure-sensitive adhesives provided in the examples and comparative examples were subjected to the following performance tests.

[0082] 180° peel strength test: According to GB2792-2014, a standard tape (25mm×200mm) was attached to a stainless steel plate that had been wiped clean with alcohol. After rolling it back and forth three times with a 2kg roller, it was left at room temperature for a period of time and then tested with a peel strength tester at a peel speed of 300mm / min. Each sample was measured more than three times and the average value was taken.

[0083] The test results are shown in Table 1.

[0084] Table 1

[0085]

[0086]

[0087] According to the test results in Table 1, the peel strength of the acrylic pressure-sensitive adhesives provided in Examples 1-9 is 38-55 N / 25 mm, and the peel strength of the acrylic pressure-sensitive adhesives provided in Examples 1-3 is 50-55 N / 25 mm.

[0088] Compared with Example 1, it can be seen that if the weight fraction of dopamine methacrylamide is too low (Example 4), the peel strength decreases, proving that the performance of the acrylate pressure-sensitive adhesive prepared with a specific weight fraction of dopamine methacrylamide is better.

[0089] Compared with Example 1, it can be seen that if the weight fraction of hydroxyethyl acrylate is too low (Example 5), the peel strength decreases, proving that the performance of the acrylate pressure-sensitive adhesive prepared with a specific weight fraction of hydroxyethyl acrylate is better.

[0090] Compared with Example 1, it can be seen that if the weight fraction of inorganic nanoparticles is too low (Example 6), the peel strength decreases; if the weight fraction of inorganic nanoparticles is too high (Example 7), the peel strength decreases, proving that the performance of the acrylate pressure-sensitive adhesive prepared with a specific weight fraction of inorganic nanoparticles is better.

[0091] Compared with Example 1, it can be seen that if the inorganic nanoparticles are replaced with silane coupling agent modified graphene oxide (Example 8), the peel strength decreases; if the inorganic nanoparticles are replaced with silane coupling agent modified silica (Example 9), the peel strength decreases, proving that the performance of the acrylate pressure-sensitive adhesive prepared by adding silane coupling agent modified graphene oxide and silane coupling agent modified silica is better.

[0092] Compared with Example 1, it can be seen that the peel strength decreases if hydroxyethyl acrylate (Comparative Example 1) is not added.

[0093] Compared with Example 1, it can be seen that the peel strength decreases if dopamine methacrylamide (Comparative Example 2) is not added.

[0094] The applicant declares that this invention illustrates an acrylic 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. An acrylic pressure-sensitive adhesive, characterized in that, The raw materials for preparing the acrylate pressure-sensitive adhesive include isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, inorganic nanoparticles, photoinitiator and chain transfer agent; The inorganic nanoparticles are silicon dioxide and graphene oxide that have been modified with silane coupling agents. The mass ratio of the silica and graphene oxide modified by the silane coupling agent is 2:1 or 1:1; the silane coupling agent includes acryloyloxypropyltrimethoxysilane. The raw materials for preparing the acrylate pressure-sensitive adhesive include the following components in parts by weight: 70-80 parts of isooctyl acrylate, 15-20 parts of acrylic acid, 3-3.5 parts of hydroxyethyl acrylate, 8-10 parts of dopamine methacrylamide, 0.5-1 parts of inorganic nanoparticles, 1-3 parts of photoinitiator, and 2-4 parts of chain transfer agent.

2. The acrylic pressure-sensitive adhesive according to claim 1, characterized in that, The inorganic nanoparticles have a particle size of 5-20 nm.

3. The acrylic pressure-sensitive adhesive according to claim 1, characterized in that, The graphene oxide has a particle size of 15-50 nm.

4. The acrylic pressure-sensitive adhesive according to claim 1, characterized in that, The photoinitiator includes any one or a combination of at least two of the following: 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

5. The acrylic pressure-sensitive adhesive according to claim 1, characterized in that, The chain transfer agent includes dodecyl mercaptan.

6. A method for preparing an acrylic pressure-sensitive adhesive as described in any one of claims 1-5, characterized in that, The preparation method includes the following steps: mixing isooctyl acrylate, acrylic acid, hydroxyethyl acrylate, dopamine methacrylamide, inorganic nanoparticles, photoinitiator and chain transfer agent, and irradiating with ultraviolet light to obtain the acrylate pressure-sensitive adhesive.

7. The preparation method according to claim 6, characterized in that, The ultraviolet light irradiation is carried out in a nitrogen atmosphere.

8. The preparation method according to claim 6, characterized in that, The duration of ultraviolet light irradiation is 10-30 seconds.

9. A pressure-sensitive adhesive tape, characterized in that, The pressure-sensitive tape comprises a pressure-sensitive adhesive layer formed from an acrylic pressure-sensitive adhesive as described in any one of claims 1-5.

Images