UV light-cured pressure-sensitive adhesive with high temperature resistance and high humidity resistance and application thereof

Abstract

The application relates to a UV photocuring pressure-sensitive adhesive with high-temperature resistance and high-humidity resistance and application thereof, and belongs to the field of functional high polymer materials. The UV photocuring pressure-sensitive adhesive is prepared by directly mixing the following components at room temperature: 10-60 parts of saturated acrylate polymer, 10-80 parts of monomer oligomer, 1-10 parts of gamma-methacryloxypropyltrimethoxysilane, 1-10 parts of a photoinitiator, 0.01-0.05 parts of high-purity rare earth nano-oxide, and the total amount of the above components is 100. The UV photocuring pressure-sensitive adhesive has high-temperature resistance and high-humidity resistance by using saturated acrylate polymer and monomer oligomer as the main components of the UV photocuring pressure-sensitive adhesive with high-temperature resistance and high-humidity resistance, and creatively adding gamma-methacryloxypropyltrimethoxysilane and high-purity rare earth nano-oxide.

Description

Technical Field

[0001] This invention relates to a UV-curable pressure-sensitive adhesive, and more particularly to a UV-curable pressure-sensitive adhesive with high temperature resistance and high humidity resistance and its application, belonging to the field of functional polymer materials. Background Technology

[0002] In recent years, UV-curable pressure-sensitive adhesives (PSAs) have combined the advantages of environmental protection and energy saving, avoiding the high pollution of solvent-based PSAs and the poor aging and high-temperature resistance of hot-melt PSAs. These PSAs offer advantages such as wide substrate adaptability, fast curing rate, high production efficiency, and long shelf life, aligning with the current national trend of green and environmentally friendly development. They represent a key research focus for the PSAs academic community and enterprises both domestically and internationally, and are a major development area within the PSAs industry.

[0003] Currently, there are reports on UV-curable pressure-sensitive adhesives in existing technologies. For example, CN114574109A discloses a UV-curable pressure-sensitive adhesive containing 10-60 parts by weight of an acrylate polymer with active double bonds, 10-60 parts by weight of a monofunctional acrylate soft monomer, 0-20 parts by weight of a monofunctional acrylate hard monomer, 0-10 parts by weight of a polyfunctional acrylate monomer containing at least two polymerizable double bonds per molecule, 0-10 parts by weight of an acrylate functional monomer, and 0.5-10 parts by weight of a UV photoinitiator. This UV-curable pressure-sensitive adhesive not only has no solvent pollution during preparation and use, meeting environmental protection requirements, but also has low viscosity, is easy to coat evenly and conveniently, and has excellent adhesion and peel strength. It is also easy to use, has low preparation cost, and is easy to scale up. However, for application environments with high temperature and humidity, this pressure-sensitive adhesive usually cannot exhibit good adhesion and does not meet the application requirements. In addition, CN115322731A also discloses a low-viscosity UV pressure-sensitive adhesive with high temperature and high humidity resistance. The UV-curable pressure-sensitive adhesive comprises the following components in parts by weight: polyurethane acrylate: 10 to 40 parts; monofunctional polyurethane containing carbon-carbon double bonds: 60 to 90 parts; photoinitiator: 3 to 10 parts; antioxidant: 0.05 to 0.2 parts; additives: 1.5 to 2.5 parts. The UV pressure-sensitive adhesive uses a polyurethane system, which has good product stability and long service life and can be used in high temperature and high humidity environments. However, polyurethane acrylate has a slow curing speed and relatively high price, so it cannot be used as the main oligomer and is often used as an auxiliary functional resin.

[0004] Therefore, in order to meet environmental protection requirements and industrial production requirements for application in high temperature and high humidity environments, there is an urgent need in this field to develop a pollution-free, low-cost, easy-to-use UV-curable pressure-sensitive adhesive that is resistant to high temperature and high humidity and has excellent adhesion. Summary of the Invention

[0005] The purpose of this invention is to provide a UV pressure-sensitive adhesive with high temperature and high humidity resistance and its application, aiming to solve the problem that existing UV pressure-sensitive adhesives have insufficient adhesion under high temperature and high humidity conditions, making them difficult to apply in technical fields with high adhesion performance requirements in high temperature and high humidity environments.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0007] A UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance is prepared by directly and thoroughly mixing the following components in parts by weight at room temperature:

[0008] Saturated acrylate polymer: 10 parts to 60 parts;

[0009] Monomer oligomers: 10 to 80 parts;

[0010] γ-Methacryloxypropyltrimethoxysilane: 1 part to 10 parts;

[0011] Photoinitiator: 1 to 10 parts;

[0012] High-purity rare earth nano-oxides: 0.01 parts to 0.05 parts;

[0013] The sum of the mass fractions of the above components is 100.

[0014] In some embodiments, the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance is prepared by directly and thoroughly mixing the following components in parts by weight at room temperature:

[0015] Saturated acrylate polymer: 30 to 50 parts;

[0016] Monomer oligomers: 40 to 70 parts;

[0017] γ-Methacryloxypropyltrimethoxysilane: 1 part to 5 parts;

[0018] Photoinitiator: 1 to 5 parts;

[0019] High-purity rare earth nano-oxides: 0.02 parts to 0.05 parts;

[0020] The sum of the mass fractions of the above components is 100.

[0021] In some embodiments, the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance is prepared by directly and thoroughly mixing the following components in parts by weight at room temperature:

[0022] Saturated acrylate polymer: 35 parts to 45 parts;

[0023] Monomer oligomers: 45 to 65 parts;

[0024] γ-Methacryloxypropyltrimethoxysilane: 2 to 5 parts;

[0025] Photoinitiator: 1.5 to 5 parts;

[0026] High-purity rare earth nano-oxides: 0.02 parts to 0.04 parts;

[0027] In some embodiments, the above-mentioned saturated acrylate polymer has a weight-average molecular weight in the range of 10,000 to 1,000,000, a number-average molecular weight in the range of 10,000 to 500,000, and a glass transition temperature in the range of -100°C to 0°C.

[0028] In some embodiments, the above-mentioned saturated acrylate polymer has a weight-average molecular weight in the range of 30,000 to 1,000,000, a number-average molecular weight in the range of 20,000 to 50,000, and a glass transition temperature in the range of -70°C to -5°C.

[0029] In some embodiments, the above-mentioned saturated acrylate polymer is obtained by bulk polymerization of 110 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1 to 1.0 parts by mass of an initiator, and 1 to 5 parts by mass of a chain transfer agent under constant temperature water bath heating at 35 to 70°C.

[0030] In some embodiments, the above-mentioned saturated acrylate polymer is obtained by bulk polymerization of 100 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1 to 1.0 parts by mass of an initiator, and 1 to 5 parts by mass of a chain transfer agent under constant temperature water bath heating at 50 to 60°C.

[0031] In some embodiments, the monofunctional monomer having a polymerizable double bond per molecule is selected from any one or more combinations of methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, isooctyl methacrylate, isobornyl methacrylate, lauryl methacrylate, methacrylic acid, acrylic acid, ethyl acrylate, methyl acrylate, butyl acrylate, isooctyl acrylate, lauryl acrylate, and styrene.

[0032] In some embodiments, the photoinitiator is selected from any one or more combinations of azobisisobutyronitrile, 1-tert-pentylazo-1-cyanocyclohexane, lauroyl peroxide, 1-tert-butylazo-1-cyanocyclohexane, tert-butyl peroctanoate, tert-butyl peroxy-2-ethylhexanoate, tert-butyl perbenzoate, butyl perbenzoate, tert-butyl peroxyformate, di-tert-butyl peroxide, diisopropylbenzene hydrogen peroxide, tert-pentyl hydrogen peroxide, and tert-butyl hydrogen peroxide.

[0033] In some embodiments, the chain transfer agent is selected from any one or more combinations of n-propylthiol, n-butylthiol, n-octylthiol, n-dodecylthiol, dithioester, and α-methylstyrene dimer.

[0034] In some embodiments, the monofunctional monomer having a polymerizable double bond per molecule is a combination of methyl methacrylate, n-butyl methacrylate, n-butyl acrylate and isooctyl acrylate, the photoinitiator is lauroyl peroxide, and the chain transfer agent is n-dodecyl mercaptan.

[0035] In some embodiments, the monomer oligomer is any one or a combination of n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, isooctyl acrylate, lauryl acrylate, octadecyl acrylate, isooctyl methacrylate, lauryl methacrylate, octadecyl methacrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobornyl methacrylate, methyl acrylate, ethyl acrylate, n-propyl acrylate, tert-butyl acrylate, and styrene.

[0036] In some embodiments, the monomer oligomer is any one or a combination of butyl methacrylate, lauryl methacrylate, and cyclohexyl methacrylate.

[0037] In some embodiments, the UV photoinitiator is selected from any one or a combination of 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzophenone, benzoyl dimethyl ether, benzoin dimethyl ether, and benzoin isopropyl ether.

[0038] In some embodiments, the high-purity rare earth nano-oxides are selected from any one or more combinations of europium oxide (Eu2O3), lutetium oxide (Lu2O3), ytterbium oxide (Yb2O3), and thulium oxide (Tm2O3), with a purity of at least greater than 99% and a particle size of at least less than 100 nm.

[0039] In some embodiments, the high-purity rare earth nano-oxides are selected from any one or more combinations of europium oxide (Eu2O3), lutetium oxide (Lu2O3), ytterbium oxide (Yb2O3), and thulium oxide (Tm2O3), with a purity of at least 99.9% and a particle size (particle diameter) of at least 80 nm.

[0040] One application of the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance described in this invention is to apply the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance onto a substrate film using a coating applicator, and then place it under a UV irradiation device for photocuring to obtain a pressure-sensitive adhesive product.

[0041] One application of the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance described in this invention involves coating the UV-curable pressure-sensitive adhesive onto a PC film using a 50μm coating applicator, and then placing it on a conveyor belt UV machine at a conveyor speed of 0.08m / s and a light irradiation power of 2000W for one pass to obtain the pressure-sensitive adhesive product.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1) Compared with other UV-curable pressure-sensitive adhesives that require special preparation methods or multiple irradiations for curing, the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance described in this invention can be prepared simply by directly and thoroughly mixing the components according to the specified ratio at room temperature. Not only is the preparation process simple, but it also only requires one irradiation on a conveyor belt UV machine during use, making the operation time-saving and convenient.

[0044] 2) Compared with existing acrylic UV-curable pressure-sensitive adhesives, the UV-curable pressure-sensitive adhesive of this invention, which is resistant to high temperature and high humidity, can bond substrates in high temperature and high humidity environments, exhibiting excellent initial tack and holding power. Tests have shown that the UV-curable pressure-sensitive adhesive of this invention, which is resistant to high temperature and high humidity, can achieve an initial tack of up to a #7 steel ball in high temperature and high humidity environments.

[0045] 3) Compared with UV-curable pressure-sensitive adhesives with high temperature and high humidity resistance in polyurethane systems, the UV-curable pressure-sensitive adhesive described in this invention has a faster curing speed and lower preparation cost.

[0046] 4) The saturated acrylic polymer described in this invention can be obtained by bulk polymerization at a lower water bath temperature. Moreover, the preparation of the remaining components in the UV-curable pressure-sensitive adhesive with high temperature resistance and high humidity resistance described in this invention is convenient and simple, and it is also energy-saving and environmentally friendly.

[0047] In summary, this invention uses saturated acrylic polymers and monomeric oligomers as the main components of the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance. Furthermore, the innovative addition of γ-methacryloyloxypropyltrimethoxysilane and high-purity rare earth nano-oxides enables the UV-curable pressure-sensitive adhesive to possess these properties. Compared to UV-curable pressure-sensitive adhesives with similar functions, the UV-curable pressure-sensitive adhesive of this invention is environmentally friendly in both preparation and use, simple and convenient to use, and low in cost, making it suitable for industrial production. Detailed Implementation

[0048] The technical solution of the present invention will be further described in detail and completely below with reference to the embodiments.

[0049] In the following embodiments:

[0050] Initial tack: The initial tack was measured using an initial tack tester in accordance with the standard GB / T4852-2002, "Test Method for Initial Tack of Pressure Sensitive Adhesive Tape (Rolling Ball Method)".

[0051] Holding power: The holding power of pressure-sensitive adhesive tapes was tested using a holding power tester in accordance with the standard GB / T4851-1988.

[0052] 180° peel strength: The peel strength was determined using a peel tester in accordance with the standard "Test Method for Peel Strength of Adhesive Tapes" (GB / T2792—2014).

[0053] Viscosity: Tested using a Brookfield rotational viscometer at a temperature of 65°C and a humidity of 50%.

[0054] Example 1: Preparation of saturated acrylate polymers

[0055] 200 g of MMA (methyl methacrylate), 110 g of BMA (n-butyl methacrylate), 130 g of EHA (isooctyl acrylate), 150 g of BA (n-butyl acrylate), 3 g of lauroyl peroxide, and 13 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until homogeneous. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the saturated acrylate polymer, abbreviated as Polymer I. Characterization data for this polymer are shown in Table 1.

[0056] Example 2: Preparation of saturated acrylate polymers

[0057] 130 g of MMA (methyl methacrylate), 80 g of BMA (n-butyl methacrylate), 210 g of EHA (isooctyl acrylate), 200 g of BA (n-butyl acrylate), 3 g of lauroyl peroxide, and 11 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until homogeneous. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the saturated acrylate polymer, abbreviated as Polymer II. Characterization data for this polymer are shown in Table 1.

[0058] Example 3: Preparation of saturated acrylate polymers

[0059] 110 g of MMA (methyl methacrylate), 50 g of BMA (n-butyl methacrylate), 250 g of EHA (isooctyl acrylate), 200 g of BA (n-butyl acrylate), 3 g of lauroyl peroxide, and 6 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until homogeneous. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the saturated acrylate polymer, abbreviated as Polymer III. Characterization data for this polymer are shown in Table 1.

[0060] Comparative Example 1: Preparation of acrylate polymers containing active double bonds

[0061] 240 g of MMA (methyl methacrylate), 180 g of BMA (n-butyl methacrylate), 90 g of EHA (isooctyl acrylate), 72 g of BA (n-butyl acrylate), 18 g of TPGDA (tripropylene glycol diacrylate), 3 g of lauroyl peroxide, and 21 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until uniformly mixed. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the acrylate polymer containing active double bonds described in this invention, abbreviated as polymer a. Characterization data of this polymer are shown in Table 1.

[0062] Comparative Example 2: Preparation of acrylate polymers containing active double bonds

[0063] 180 g of MMA (methyl methacrylate), 120 g of BMA (n-butyl methacrylate), 180 g of EHA (isooctyl acrylate), 111 g of BA (n-butyl acrylate), 3 g of TPGDA (tripropylene glycol diacrylate), 3 g of lauroyl peroxide, and 15 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until uniformly mixed. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the acrylate polymer containing active double bonds described in this invention, abbreviated as polymer b. Characterization data for this polymer are shown in Table 1.

[0064] Comparative Example 3: Preparation of acrylate polymers containing active double bonds

[0065] 180 g of MMA (methyl methacrylate), 114 g of BMA (n-butyl methacrylate), 186 g of EHA (isooctyl acrylate), 114 g of BA (n-butyl acrylate), 5 g of DPGDA (dipropylene glycol diacrylate), 3 g of lauroyl peroxide, and 9 g of n-dodecyl mercaptan were added to a bulk polymerization bag and stirred until uniformly mixed. The bulk polymerization bag was then placed in a water bath and subjected to bulk polymerization at a constant temperature of 55°C for 10 h. The bulk polymerization bag was then removed, cooled to room temperature, and the resulting solid acrylic resin was pulverized to obtain the acrylate polymer containing active double bonds described in this invention, abbreviated as polymer c. Characterization data for this polymer are shown in Table 1.

[0066] TPGDA was added in the preparation of acrylate polymers containing active double bonds in Comparative Examples 1-3, while TPGDA was not added in the preparation of saturated acrylate polymers in Examples 1-3.

[0067] Table 1. Characterization data of the polymers obtained in Examples 1-3 and Comparative Examples 1-3.

[0068] sample Weight-average molecular weight (g / mol) Number-average molecular weight (g / mol) Tg (°C) Polymer I 45200 25000 -16.0 Polymer II 85500 35000 -46.5 Polymer III 98500 50100 -52.7 polymer a 54200 25300 -15.5 polymer b 75400 36500 -46.3 polymer c 99600 48300 -51.0

[0069] Application example:

[0070] First, the saturated acrylate polymers prepared in Examples 1-3 were directly and thoroughly mixed at room temperature according to the components and proportions shown in Table 2 to obtain the UV-curable pressure-sensitive adhesives with high temperature and high humidity resistance described in this invention (referred to as Application Examples 1-3). Viscosity tests were then performed, and the results are shown in Table 4. Next, the adhesive was coated onto a PC film using a 50μm coating applicator and then placed on a conveyor belt UV curing machine (such as a vertical UV curing machine, model 4021-20, manufactured by Shenzhen Minghaote Lamp Co., Ltd.) at a conveying speed of 0.08m / s and a light power of 2000W for one pass of light curing to obtain the pressure-sensitive adhesive product. Then, initial tack, holding power, and peel strength tests were performed, and the test results are detailed in Table 4.

[0071] First, the acrylate polymers containing active double bonds prepared in Comparative Examples 1-3 were directly and thoroughly mixed at room temperature according to the components and proportions shown in Table 3 to obtain UV-curable pressure-sensitive adhesives (referred to as Application Examples 4-6), and viscosity tests were performed. The viscosity test results are shown in Table 4. Then, a 50μm coating tool was used to coat the film onto a PC film, and then the film was placed on a conveyor belt UV machine (such as a vertical UV curing machine, model 4021-20, manufactured by Shenzhen Minghaote Lamp Co., Ltd.) at a conveying speed of 0.08m / s and a light power of 2000W for one pass of light irradiation to obtain pressure-sensitive adhesive products. Then, initial tack, holding power, and peel strength tests were performed, and the test results are detailed in Table 4.

[0072] Table 2 Formulations for Application Examples 1-3

[0073] formula Application Example 1 Application Example 2 Application Example 3 Polymer I (grams) 40 Polymer II (grams) 40 Polymer III (grams) 40 Lauryl methacrylate (g) 50 50 50 γ-Methacryloxypropyltrimethoxysilane (g) 4 4 4 2-Hydroxy-2-methyl-1-phenyl-1-propanone (g) 6 6 6 High-purity rare earth nano-oxides (grams) 0.12 0.12 0.12

[0074] In Table 2, the high-purity rare earth nano-oxides are specifically Yb2O3, with a purity of 99.99% and a particle size of 70 nm.

[0075] Table 3 Formulations for Application Examples 4-6

[0076] formula Application Example 4 Application Example 5 Application Example 6 Polymer a (grams) 40 Polymer b (grams) 40 Polymer c (grams) 40 2-Ethylhexyl acrylate (g) 30 25 28 n-Butyl acrylate (g) 15 15 15 Methyl methacrylate (g) 9 14 11 Hexanediol diacrylate (g) 1.5 1.5 1.5 Methacrylic acid (grams) 2 2 2 2-Hydroxy-2-methyl-1-phenyl-1-propanone (g) 2.5 2.5 Benzophenone (grams) 2.5

[0077] Table 4 Test results of Application Examples 1-6

[0078]

[0079]

[0080] As can be seen from the data in Table 4, under higher temperature and humidity conditions, the viscosity of Application Examples 4-6 is lower (400-600), while the viscosity of Application Examples 1-3 is (700-1000). Therefore, the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance described in this invention can still exhibit excellent bonding performance.

[0081] In summary, this invention utilizes saturated acrylic polymers and monomeric oligomers as the main components of the UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance. Furthermore, the innovative addition of γ-methacryloyloxypropyltrimethoxysilane and high-purity rare earth nano-oxides enables the UV-curable pressure-sensitive adhesive to possess these properties. Moreover, compared to UV-curable pressure-sensitive adhesives with similar functions, the UV-curable pressure-sensitive adhesive of this invention is environmentally friendly in both preparation and use, simple and convenient to use, and low in cost, making it suitable for industrial production.

[0082] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A UV-curable pressure-sensitive adhesive with high temperature and high humidity resistance, characterized in that, It is prepared by directly and thoroughly mixing the following components in parts by weight at room temperature: Saturated acrylate polymer: 10 parts to 40 parts; Single component: 50 to 80 parts; γ-Methacryloxypropyltrimethoxysilane: 1 part to 10 parts; Photoinitiator: 1 to 10 parts; High-purity rare earth nano-oxides: 0.01 parts to 0.05 parts; The sum of the mass fractions of the above components is 100; The saturated acrylate polymer is obtained by bulk polymerization of 110 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1-1.0 parts by mass of an initiator, and 1-5 parts by mass of a chain transfer agent in a constant temperature water bath at 35-70°C; or The saturated acrylate polymer is obtained by bulk polymerization of 100 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1 to 1.0 parts by mass of an initiator, and 1 to 5 parts by mass of a chain transfer agent under constant temperature water bath heating at 50 to 60°C. The monofunctional monomer having a polymerizable double bond per molecule is selected from any one or more combinations of methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, isooctyl methacrylate, isobornyl methacrylate, lauryl methacrylate, methacrylic acid, acrylic acid, ethyl acrylate, methyl acrylate, butyl acrylate, isooctyl acrylate, lauryl acrylate, and styrene. The monomer is any one or a combination of n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, isooctyl acrylate, lauryl acrylate, octadecyl acrylate, isooctyl methacrylate, lauryl methacrylate, octadecyl methacrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobornyl methacrylate, methyl acrylate, ethyl acrylate, n-propyl acrylate, tert-butyl acrylate, and styrene. The high-purity rare earth nano-oxides are selected from any one or more combinations of Eu2O3, Lu2O3, Yb2O3, and Tm2O3, with a purity of at least 99% and a particle size of at least 100 nm.

2. The UV-curable pressure-sensitive adhesive according to claim 1, characterized in that, It is prepared by directly and thoroughly mixing the following components in parts by weight at room temperature: Saturated acrylate polymer: 30 to 40 parts; Monomer: 50-65 parts; γ-Methacryloxypropyltrimethoxysilane: 1 part to 5 parts; Photoinitiator: 1 to 5 parts; High-purity rare earth nano-oxides: 0.02 parts to 0.05 parts; The sum of the mass fractions of the above components is 100.

3. The UV-curable pressure-sensitive adhesive according to any one of claims 1-2, characterized in that, The saturated acrylate polymer has a weight-average molecular weight in the range of 10,000 to 1,000,000, a number-average molecular weight in the range of 10,000 to 500,000, and a glass transition temperature in the range of -100°C to 0°C.

4. The UV-curable pressure-sensitive adhesive according to any one of claims 1-2, characterized in that, The photoinitiator is selected from any one or a combination of 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzophenone, benzoin dimethyl ether, benzoin dimethyl ether, and benzoin isopropyl ether; or The chain transfer agent is selected from any one or a combination of n-propylthiol, n-butylthiol, n-octylthiol, n-dodecylthiol, dithioester, and α-methylstyrene dimer.

5. The UV-curable pressure-sensitive adhesive according to any one of claims 1-2, characterized in that, The saturated acrylate polymer is obtained by bulk polymerization of 110 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1-1.0 parts by mass of an initiator, and 1-5 parts by mass of a chain transfer agent in a constant temperature water bath at 35-70°C; or The saturated acrylate polymer is obtained by bulk polymerization of 100 parts by mass of a monofunctional monomer having one polymerizable double bond per molecule, 0.1 to 1.0 parts by mass of an initiator, and 1 to 5 parts by mass of a chain transfer agent under constant temperature water bath heating at 50 to 60°C. The monofunctional monomers, each having a polymerizable double bond, are a combination of methyl methacrylate, n-butyl methacrylate, n-butyl acrylate, and isooctyl acrylate. The chain transfer agent is n-dodecyl mercaptan.

6. An application of the UV-curable pressure-sensitive adhesive as described in any one of claims 1-5, characterized in that, The UV-curable pressure-sensitive adhesive is applied to a substrate film using a coating applicator, and then placed under a UV light irradiation device for photocuring to obtain a pressure-sensitive adhesive product.

7. An application of the UV-curable pressure-sensitive adhesive as described in any one of claims 1-5, characterized in that, The UV-curable pressure-sensitive adhesive is applied onto a PC film using a 50μm coating applicator, and then placed on a conveyor belt UV machine at a conveyor speed of 0.08m / s and a light power of 2000W for one pass of light irradiation to obtain the pressure-sensitive adhesive product.

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