Anti-dazzle and ultraviolet-blocking vehicle-mounted OCA optical adhesive and preparation method thereof

Abstract

The invention relates to the technical field of optical transparent adhesives, and particularly discloses an anti-dazzle and ultraviolet-blocking vehicle-mounted OCA optical adhesive. Comprising the following raw materials: a monofunctional acrylate monomer with a cyclic structure, a bifunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, a hindered phenol antioxidant monomer with an acrylate structure, and a thermal initiator. According to the vehicle-mounted OCA optical adhesive, the vehicle-mounted OCA optical adhesive is prepared from the following raw materials: nano-scale monodisperse crosslinked polystyrene microspheres, an ultraviolet light initiator and an acrylate monomer containing rare earth ions, so that the vehicle-mounted OCA optical adhesive not only has good humidity and heat resistance and high temperature resistance, but also has excellent intrinsic ultraviolet barrier property, oxidation resistance and anti-dazzle property; the strict requirements of vehicle-mounted display on high definition and low glare are greatly met, and the market application prospect is wide.

Description

Technical Field

[0001] This invention relates to the field of optical transparent adhesive technology, and more specifically, to an anti-glare and ultraviolet-blocking automotive OCA optical adhesive and its preparation method. Background Technology

[0002] OCA transparent optical adhesive boasts excellent optical properties, high bonding strength, and low curing shrinkage, making it widely used in the lamination and bonding of display device cover plates and display modules. In recent years, with the continuous upgrading and development of my country's new energy vehicle industry and the increasing number of in-vehicle display devices, the demand for OCA optical adhesive has also been growing. However, the high temperature and humidity environment and prolonged outdoor ultraviolet radiation during vehicle use place higher demands on OCA. Conventional OCA products, however, are prone to bubbling under high temperature and humidity conditions, and suffer from OCA aging, performance degradation, and discoloration after ultraviolet radiation, affecting the visual effect and display quality of in-vehicle displays. Furthermore, since in-vehicle devices are often used under strong light, glare from sunlight can also severely impact the display effect.

[0003] In the field of automotive OCA optical adhesives, several existing technical solutions have certain limitations. Patent CN118978880A discloses a high-temperature resistant automotive OCA optical adhesive and its preparation method, but it cannot achieve ultraviolet (UV) blocking. After prolonged use, UV radiation may damage the chemical bonds of the organic materials inside the automotive equipment, causing electrons to detach from atoms and creating vacancies. This, in turn, affects the chemical structure and properties of the material, ultimately impacting the normal operation of the automotive equipment.

[0004] In the technical solutions disclosed in patent CN117126610A (a high-temperature resistant automotive OCA optical adhesive, film and preparation method) and patent CN119931513A (an automotive OCA optical adhesive and preparation method), the addition of acrylomorpholine provides a certain UV blocking effect. However, the UV blocking effect mainly relies on the conjugated π-electron structure in the chemical structure. Due to structural limitations, the UV blocking effect of conventional monomers such as acrylomorpholine is limited.

[0005] Currently, adding specific UV absorbers remains a conventional and reasonable method for achieving UV blocking. Common examples include salicylates, benzophenones, benzotriazoles, substituted acrylonitriles, triazines, and hindered amines. Among these, benzotriazoles have attracted considerable attention due to their wide UV absorption wavelength range and good chemical stability. However, benzotriazoles have poor compatibility with acrylates, easily leading to precipitation and poor dispersion in practical applications, which seriously hinders their widespread use in the OCA (Optical Carbon Acrylic Acid) field.

[0006] To address the technical requirements for anti-glare OCA in automotive applications, current common solutions involve modifying the OCA with nanoparticles such as zinc oxide and silica. However, conventional inorganic nanoparticles suffer from poor monodispersity and poor compatibility with the OCA matrix resin. Typically, a large amount of nanoparticles is needed to increase diffuse reflection and achieve anti-glare, but this leads to increased haze in the OCA colloid, reducing screen display quality and failing to meet the stringent requirements of high definition and low glare for automotive displays. Summary of the Invention

[0007] To address the problems of poor anti-glare and inadequate UV blocking effects in existing OCA optical adhesives, this invention provides an anti-glare and UV blocking automotive OCA optical adhesive and its preparation method.

[0008] This invention provides an anti-glare and UV-blocking automotive OCA optical adhesive, employing the following technical solution: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 5-10 parts of monofunctional acrylate monomers with a cyclic structure, 20-30 parts of difunctional acrylate monomers containing hydrophilic groups, 60-70 parts of short-chain acrylate monomers containing monofunctional groups, 0.5-1 part of acrylate monomers containing benzotriazole structures, 0.5-1 part of hindered phenolic antioxidant monomers with acrylate structures, 0.01-1 part of acrylate monomers containing rare earth ions, 0.2-0.5 parts of thermal initiator, 0.1-0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres, and 0.2-0.5 parts of UV photoinitiator.

[0009] Preferably, the monofunctional acrylate monomer with a cyclic structure is at least one of acrylmorpholine, isobornyl acrylate, tetrahydrofurfuryl acrylate, and glycidyl acrylate.

[0010] Preferably, the bifunctional acrylate monomer containing a hydrophilic group is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, itaconic acid diacrylate, 2-acrylamide-2-methylpropanesulfonic acid diacrylate, N,N-disacryloylethylenediamine, and bisphenol A diglycidyl ether diacrylate.

[0011] Preferably, the monofunctional short-chain acrylate monomer is at least one of methyl acrylate, ethyl acrylate, butyl acrylate, and isooctyl acrylate.

[0012] Preferably, the acrylate monomer containing the benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate and / or propyl 3-[3-tert-butyl-5-(5-chlorobenzothiazol-2-yl)-4-hydroxyphenyl]-2-methacrylate.

[0013] Preferably, the hindered phenolic antioxidant monomer having an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and / or methyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate.

[0014] Preferably, the thermal initiator is at least one of benzoyl peroxide, di-tert-butyl peroxide, and lauroyl peroxide.

[0015] Preferably, the particle size of the monodisperse cross-linked polystyrene microspheres is 10-50 nm.

[0016] Preferably, the ultraviolet photoinitiator is at least one of trimethylbenzoyl diphenylphosphine oxide, isopropylthioxanthone, 2-hydroxy-2-methyl-1-phenyl-1-propane-one, and 1-hydroxycyclohexylphenyl ketone.

[0017] Preferably, the anti-glare and UV-blocking automotive OCA optical adhesive further includes 0.01-1 part of acrylate monomers containing rare earth ions; The acrylate monomer containing rare earth ions is at least one of lanthanum acrylate, lanthanum methacrylate, cerium acrylate, cerium methacrylate, neodymium acrylate, and neodymium methacrylate.

[0018] A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reactor and reacted by heating with thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. Hindered phenolic antioxidant monomers with acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and ultraviolet photoinitiator are added to intermediate resin L. After stirring evenly, the mixture is coated with a two-roller and irradiated with 405nm ultraviolet light with UVF intensity until the reaction is complete, thus obtaining an anti-glare and ultraviolet-blocking automotive OCA optical adhesive.

[0019] Preferably, the conditions for the heating reaction by thermal irradiation are: temperature of 50-65℃ and time of 2-4h.

[0020] Preferably, the ultraviolet light intensity (UVF) is 0.1-0.3 mW / cm². 2 .

[0021] In summary, the present invention has the following beneficial effects: 1. This invention utilizes benzotriazole-based acrylate monomers with UV-blocking properties. These monomers no longer exist in a free form within the cross-linking network of the matrix resin but participate in the copolymerization reaction, uniformly and firmly embedding themselves within the cross-linking network. This effectively solves the problems of poor compatibility and easy precipitation of existing UV blockers, further enhancing the overall UV-blocking effect of OCA colloids. This invention employs regularly shaped, spherical, nanoscale monodisperse cross-linked polystyrene microspheres, which possess excellent light-scattering effects and, being organic polymers, exhibit better compatibility with OCA matrix resins compared to existing inorganic fillers. Furthermore, the addition of a small amount of nanoscale monodisperse cross-linked polystyrene microspheres achieves excellent anti-glare effects. Based on the copolymerization of UV-blocking monomers, this invention further copolymerizes antioxidant monomers, not only solving potential compatibility issues affecting optical performance but also achieving antioxidant UV-blocking effects at the molecular level, demonstrating broad application prospects.

[0022] 2. This invention also employs acrylate monomers containing rare earth ions. The introduction of rare earth ions can form specific molecular structures with acrylate monomers through coordination interactions. During resin curing, the coordination field effect of rare earth ions can regulate the regularity of polymer chain arrangement, making the size and distribution of scattering centers more uniform, avoiding increased haze or decreased light transmittance due to uneven scattering, thereby reducing glare. Rare earth ions can also have a synergistic effect with acrylate monomers containing benzotriazole structures: the excited-state electrons generated after the benzotriazole group absorbs ultraviolet light can be transferred through the coordination bonds of rare earth ions, accelerating the quenching of the excited state and reducing the damage of photo-oxidation reactions to OCA optical adhesives. In addition, acrylate monomers containing rare earth ions can form dual protection with hindered phenolic antioxidant monomers with acrylate structures: hindered phenols capture free radicals through hydrogen transfer, and rare earth ions scavenge free radicals through valence state changes, thereby extending the ultraviolet weather resistance of the optical adhesive and avoiding performance degradation caused by long-term ultraviolet radiation.

[0023] 3. The preparation method of the anti-glare and ultraviolet-blocking automotive OCA optical adhesive of the present invention is simple, does not involve solvent evaporation, is green and environmentally friendly, and is suitable for industrial production. The anti-glare and ultraviolet-blocking automotive OCA optical adhesive prepared by the present invention not only has good resistance to damp heat and high temperature, but also has excellent intrinsic ultraviolet blocking performance, antioxidant performance and anti-glare performance, which greatly meets the various needs of automotive display devices. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] Examples 1-3 provide an anti-glare and UV-blocking automotive OCA optical adhesive and its preparation method.

[0026] Example 1: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 10 parts of monofunctional acrylate monomers with a cyclic structure, 20 parts of difunctional acrylate monomers containing hydrophilic groups, 69 parts of short-chain acrylate monomers containing monofunctional groups, 1 part of acrylate monomers containing a benzotriazole structure, 0.5 parts of hindered phenolic antioxidant monomers with an acrylate structure, 0.5 parts of acrylate monomers containing rare earth ions, 0.2 parts of thermal initiator, 0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 10 nm), and 0.2 parts of UV photoinitiator; Among them, the monofunctional acrylate monomer with a cyclic structure is isobornyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is hydroxyethyl acrylate; the monofunctional short-chain acrylate monomer is butyl acrylate; the acrylate monomer containing a benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate; the hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate; the thermal initiator is benzoyl peroxide; the ultraviolet initiator is trimethylbenzoyl diphenylphosphine oxide; and the acrylate monomer containing rare earth ions is cerium acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reaction vessel and heated to 50°C for 4 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. A hindered phenolic antioxidant monomer with an acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and a UV photoinitiator were added to intermediate resin L. After stirring evenly, a coating with a UVF intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0027] The prepared OCA optical adhesive has a storage modulus of 1.5E+5Pa at 25℃, exhibits strong absorption of ultraviolet light with wavelengths below 380nm, and has a specular reflectivity of 0.48%.

[0028] Example 2: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 5 parts of monofunctional acrylate monomers with a cyclic structure, 30 parts of difunctional acrylate monomers containing hydrophilic groups, 70 parts of short-chain acrylate monomers containing monofunctional groups, 0.5 parts of acrylate monomers containing benzotriazole structures, 1 part of hindered phenolic antioxidant monomers with acrylate structures, 1 part of acrylate monomers containing rare earth ions, 0.2 parts of thermal initiator, 0.1 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 30 nm), and 0.5 parts of UV photoinitiator.

[0029] Among them, the monofunctional acrylate monomer with a cyclic structure is glycidyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is itaconic acid diacrylate; the monofunctional short-chain acrylate monomer is methyl acrylate; the acrylate monomer containing a benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate; the hindered phenolic antioxidant monomer with an acrylate structure is methyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate; the thermal initiator is lauroyl peroxide; the ultraviolet initiator is isopropylthioxanthone; and the acrylate monomer containing rare earth ions is lanthanum acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reactor and heated to 55°C for 3 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. Hindered phenolic antioxidant monomers with acrylate structures, nano-sized monodisperse cross-linked polystyrene microspheres, and ultraviolet photoinitiator were added to intermediate resin L, stirred evenly, and then coated with a UVF (0.2 mW / cm²) material using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0030] Example 3: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 8 parts of monofunctional acrylate monomers with a cyclic structure, 25 parts of difunctional acrylate monomers containing hydrophilic groups, 60 parts of short-chain acrylate monomers containing monofunctional groups, 0.8 parts of acrylate monomers containing benzotriazole structures, 0.8 parts of hindered phenolic antioxidant monomers with acrylate structures, 0.5 parts of acrylate monomers containing rare earth ions, 0.4 parts of thermal initiator, 0.15 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 50 nm), and 0.45 parts of UV photoinitiator.

[0031] Among them, the monofunctional acrylate monomer with a cyclic structure is acryloylmorpholine; the difunctional acrylate monomer containing a hydrophilic group is 2-acrylamido-2-methylpropanesulfonic acid diacrylate; the monofunctional short-chain acrylate monomer is isooctyl acrylate; the acrylate monomer containing a benzotriazole structure is 3-[3-tert-butyl-5-(5-chlorobenzothiazol-2-yl)-4-hydroxyphenyl]-2-methylacrylate propyl ester; the hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate; the thermal initiator is di-tert-butyl peroxide; the ultraviolet initiator is 2-hydroxy-2-methyl-1-phenyl-1-propane-one; and the acrylate monomer containing rare earth ions is neodymium acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reactor and heated to 65°C for 2 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. A hindered phenolic antioxidant monomer with an acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and a UV photoinitiator were added to intermediate resin L. After stirring evenly, a coating with a UVF intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0032] To verify the performance of the anti-glare and UV-blocking automotive OCA optical adhesive provided by this invention, the inventors set up comparative examples 1-4, wherein: Comparative Example 1: Comparative Example 1 differs from Example 1 only in that an equal mass of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole is used to replace the acrylate monomer containing the benzotriazole structure, as detailed below: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 10 parts of monofunctional acrylate monomers with a cyclic structure, 20 parts of difunctional acrylate monomers containing hydrophilic groups, 69 parts of short-chain acrylate monomers containing monofunctional groups, 1 part of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 0.5 parts of hindered phenolic antioxidant monomers with acrylate structure, 0.5 parts of acrylate monomers containing rare earth ions, 0.2 parts of thermal initiator, 0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 10 nm), and 0.2 parts of UV photoinitiator; Among them, the monofunctional acrylate monomer with a cyclic structure is isobornyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is hydroxyethyl acrylate; the monofunctional short-chain acrylate monomer is butyl acrylate; the hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; the thermal initiator is benzoyl peroxide; the ultraviolet initiator is trimethylbenzoyl diphenylphosphine oxide; and the acrylate monomer containing rare earth ions is cerium acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, an acrylate monomer containing rare earth ions, and a thermal initiator were added together into a reactor and reacted at 50°C for 4 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. A hindered phenolic antioxidant monomer with an acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and a UV photoinitiator were added to intermediate resin L. After stirring evenly, a coating with a UVF intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0033] Comparative Example 2: Comparative Example 2 differs from Example 1 only in that an equal mass of 2,4,6-tris(3',5'-di-tert-butyl-4'-hydroxybenzyl)trimethylbenzylene is used to replace the hindered phenolic antioxidant monomer with an acrylate structure, as detailed below: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 10 parts of monofunctional acrylate monomers with a cyclic structure, 20 parts of difunctional acrylate monomers containing hydrophilic groups, 69 parts of short-chain acrylate monomers containing monofunctional groups, 1 part of acrylate monomers containing benzotriazole structure, 0.5 parts of 2,4,6-tris(3',5'-di-tert-butyl-4'-hydroxybenzyl)trimethylbenzylene, 0.5 parts of acrylate monomers containing rare earth ions, 0.2 parts of thermal initiator, 0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 10 nm), and 0.2 parts of UV photoinitiator; Among them, the monofunctional acrylate monomer with a cyclic structure is isobornyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is hydroxyethyl acrylate; the monofunctional short-chain acrylate monomer is butyl acrylate; the acrylate monomer containing a benzotriazole structure is 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]ethyl methacrylate; the thermal initiator is benzoyl peroxide; the ultraviolet initiator is trimethylbenzoyl diphenylphosphine oxide; and the acrylate monomer containing rare earth ions is cerium acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reaction vessel and heated to 50°C for 4 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. 2,4,6-tris(3',5'-di-tert-butyl-4'-hydroxybenzyl)trimethylbenzene, nano-sized monodisperse cross-linked polystyrene microspheres, and a UV initiator were added to intermediate resin L. After stirring evenly, a UVF coating with an intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0034] Comparative Example 3: Comparative Example 3 differs from Example 1 only in that an equal mass of nano-silica is used to replace the nano-scale monodisperse cross-linked polystyrene microspheres.

[0035] An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 10 parts of monofunctional acrylate monomers with a cyclic structure, 20 parts of difunctional acrylate monomers containing hydrophilic groups, 69 parts of short-chain acrylate monomers containing monofunctional groups, 1 part of acrylate monomers containing a benzotriazole structure, 0.5 parts of hindered phenolic antioxidant monomers with an acrylate structure, 0.5 parts of acrylate monomers containing rare earth ions, 0.2 parts of thermal initiator, 0.2 parts of nano-silica (particle size 10nm), and 0.2 parts of UV photoinitiator; Among them, the monofunctional acrylate monomer with a cyclic structure is isobornyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is hydroxyethyl acrylate; the monofunctional short-chain acrylate monomer is butyl acrylate; the acrylate monomer containing a benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate; the hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate; the thermal initiator is benzoyl peroxide; the ultraviolet initiator is trimethylbenzoyl diphenylphosphine oxide; and the acrylate monomer containing rare earth ions is cerium acrylate. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reaction vessel and heated to 50°C for 4 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. A hindered phenolic antioxidant monomer with an acrylate structure, nano-silica, and a UV photoinitiator were added to intermediate resin L. After thorough mixing, a coating with a UVF intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0036] Comparative Example 4: Comparative Example 4 differs from Example 1 only in that it does not contain acrylate monomers with rare earth ions, as detailed below: An anti-glare and UV-blocking automotive OCA optical adhesive comprises the following raw materials in parts by weight: 10 parts of monofunctional acrylate monomers with a cyclic structure, 20 parts of difunctional acrylate monomers containing hydrophilic groups, 69 parts of short-chain acrylate monomers containing monofunctional groups, 1 part of acrylate monomers containing a benzotriazole structure, 0.5 parts of hindered phenolic antioxidant monomers with an acrylate structure, 0.2 parts of thermal initiator, 0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres (particle size 10 nm), and 0.2 parts of UV photoinitiator; Among them, the monofunctional acrylate monomer with a cyclic structure is isobornyl acrylate; the difunctional acrylate monomer containing a hydrophilic group is hydroxyethyl acrylate; the monofunctional short-chain acrylate monomer is butyl acrylate; the acrylate monomer containing a benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate; the hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; the thermal initiator is benzoyl peroxide; and the ultraviolet initiator is trimethylbenzoyl diphenylphosphine oxide. A method for preparing an anti-glare and UV-blocking automotive OCA optical adhesive includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, and a thermal initiator were added together into a reactor and the mixture was heated to 50°C and reacted for 4 hours by thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. A hindered phenolic antioxidant monomer with an acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and a UV photoinitiator were added to intermediate resin L. After stirring evenly, a coating with a UVF intensity of 0.3 mW / cm² was applied using a two-roller coating process. 2 After the reaction with 405nm ultraviolet light is complete, an anti-glare and ultraviolet blocking automotive OCA optical adhesive can be obtained.

[0037] The anti-glare and UV-blocking automotive OCA optical adhesives obtained in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests, and the test results are shown in Table 1. Energy storage modulus test: TA hybrid rheometer DHR-2, ASTM D4440-15; Transmittance test: Visible light and ultraviolet blocking were tested using a glass transmittance meter, and visible light and ultraviolet blocking were tested again after the ultraviolet light aging test, and the changes in values ​​before and after were compared; Specular reflectance test: RM-9 specular reflectance meter was used for testing; Haze test: Haze meter was used for measurement.

[0038] Table 1: ; As shown in the table above, the anti-glare and UV-blocking automotive OCA optical adhesives obtained in Examples 1-3 have a higher energy storage modulus than those in Comparative Examples 1-4, resulting in better elasticity and a stronger ability to recover its original shape after compression. The UV blocking rate is high, and the UV blocking rate only slightly decreased after the aging test, indicating that it can absorb ultraviolet rays in the entire UV range, which can effectively prevent aging. The low specular reflectivity and haze help to improve the anti-glare effect.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A vehicle-mounted OCA optical adhesive with anti-glare and UV blocking properties, characterized in that, The raw materials include the following parts by weight: 5-10 parts of monofunctional acrylate monomers with cyclic structures, 20-30 parts of difunctional acrylate monomers containing hydrophilic groups, 60-70 parts of short-chain acrylate monomers containing monofunctional groups, 0.5-1 part of acrylate monomers containing benzotriazole structures, 0.5-1 part of hindered phenolic antioxidant monomers with acrylate structures, 0.2-0.5 parts of thermal initiator, 0.1-0.2 parts of nanoscale monodisperse cross-linked polystyrene microspheres, and 0.2-0.5 parts of ultraviolet photoinitiator.

2. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The monofunctional acrylate monomer with a cyclic structure is at least one of acrylmorpholine, isobornyl acrylate, tetrahydrofurfuryl acrylate, and glycidyl acrylate.

3. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The bifunctional acrylate monomer containing a hydrophilic group is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, itaconic acid diacrylate, 2-acrylamide-2-methylpropanesulfonic acid diacrylate, N,N-disacryloylethylenediamine, and bisphenol A diglycidyl ether diacrylate.

4. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The monofunctional short-chain acrylate monomer is at least one of methyl acrylate, ethyl acrylate, butyl acrylate, and isooctyl acrylate.

5. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The acrylate monomer containing the benzotriazole structure is ethyl 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl]methacrylate and / or propyl 3-[3-tert-butyl-5-(5-chlorobenzothiazol-2-yl)-4-hydroxyphenyl]-2-methacrylate.

6. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The hindered phenolic antioxidant monomer with an acrylate structure is pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and / or methyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate.

7. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The thermal initiator is at least one of benzoyl peroxide, di-tert-butyl peroxide, and lauroyl peroxide.

8. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, The ultraviolet photoinitiator is at least one of trimethylbenzoyl diphenylphosphine oxide, isopropylthioxanthone, 2-hydroxy-2-methyl-1-phenyl-1-propane-one, and 1-hydroxycyclohexylphenyl ketone.

9. The anti-glare and UV-blocking automotive OCA optical adhesive according to claim 1, characterized in that, It also includes 0.01-1 parts of acrylate monomers containing rare earth ions; The acrylate monomer containing rare earth ions is at least one of lanthanum acrylate, lanthanum methacrylate, cerium acrylate, cerium methacrylate, neodymium acrylate, and neodymium methacrylate.

10. A method for preparing an anti-glare and ultraviolet-blocking automotive OCA optical adhesive according to any one of claims 1-9, characterized in that, Includes the following steps: A monofunctional acrylate monomer with a cyclic structure, a difunctional acrylate monomer containing a hydrophilic group, a monofunctional short-chain acrylate monomer, an acrylate monomer containing a benzotriazole structure, an acrylate monomer containing rare earth ions, and a thermal initiator are added together into a reactor and reacted by heating with thermal irradiation to obtain an intermediate resin L with a rotational viscosity of 1000-2000 mPa·s. Hindered phenolic antioxidant monomers with acrylate structure, nano-sized monodisperse cross-linked polystyrene microspheres, and ultraviolet photoinitiator are added to intermediate resin L. After stirring evenly, the mixture is coated with a two-roller and irradiated with 405nm ultraviolet light with UVF intensity until the reaction is complete, thus obtaining an anti-glare and ultraviolet-blocking automotive OCA optical adhesive.