TWI838041B - Light-shielding composition and preparation method thereof, display device - Google Patents

Abstract

The present invention discloses a shading composition and a preparation method thereof, and a display device, belonging to the field of display technology. The shading composition includes the following components in mass percentage: 40% to 60% polyurethane acrylate oligomer, 30% to 40% acrylate monomer, 3% to 10% photoinitiator, 0.3% to 5.5% additive, and 0.5% to 1.5% metal complex dye; wherein the metal complex dye includes at least two of blue dye, red dye, and purple dye, and the absorption wavelength of the metal complex dye is greater than 400nm. Through the synergistic effect of the components in reasonable proportions, the shading material formed after curing can show excellent comprehensive performance. Among them, the comprehensive properties of the shading material include but are not limited to: high curing degree, high optical density, sufficient hardness and tensile length, strong adhesion, releasability, water vapor resistance, solvent resistance, aging resistance, high temperature and high humidity resistance, etc.

Description

Light-shielding composition, preparation method thereof, and display device

The present invention relates to the field of display technology, and in particular to a light-shielding composition and a preparation method thereof, and a display device.

For frameless displays, there is no module frame on the side of the display screen. In order to prevent the backlight from leaking through the sides of the upper and lower glass substrates and the gap between them, side shading materials are usually applied to the frame area outside the operable area of the display screen to achieve a shading effect.

The common side shading materials are usually UV-curable shading materials, which contain black pigment and optional black dye, wherein the black pigment can be carbon black, and the black pigment or the combination of black pigment and black dye is used to achieve darkening.

However, black pigments such as carbon black are difficult to disperse evenly in the light-shielding material system. It is even necessary to add a dispersant to the system to make the black pigment evenly dispersed, which will not only affect the comprehensive performance of the light-shielding material, but also affect the curing degree of the light-shielding material system.

In view of this, the present invention provides a shading composition and a preparation method thereof, and a display device, which can solve the above technical problems. Specifically, it includes the following technical solutions:

On the one hand, a sunshade composition is provided, which comprises the following components in mass percentage: 40% to 60% polyurethane acrylate oligomer, 30% to 40% acrylate monomer, 3% to 10% photoinitiator, 0.3% to 5.5% additive, and 0.5% to 1.5% metal complex dye; wherein the metal complex dye comprises at least two of blue dye, red dye, and purple dye; and/or the absorption wavelength of the metal complex dye is greater than 400nm.

In some possible implementations, the blue dye includes at least one of Solvent Blue 5 and Solvent Blue 70; and/or the red dye includes at least one of Solvent Red 8, Solvent Red 122, Solvent Red 119, Solvent Red 132, and Solvent Red 124; and/or the purple dye includes at least one of Solvent Violet 58 and Triamet Violet 5R.

In some possible implementations, the functionality of the polyurethane acrylate oligomer is 2-3, and the weight average molecular weight is 1500-6000; and/or, the polyurethane acrylate oligomer includes at least one of polyether polyurethane, polyester polyurethane, polycarbonate polyurethane, and polybutadiene polyurethane.

In some possible implementations, the acrylate monomer includes at least one monofunctional acrylate and at least one trifunctional acrylate; and/or, the mass percentage of the trifunctional acrylate in the light-shielding composition is 1% to 5%.

In some possible implementations, the monofunctional acrylate includes at least one of lauryl acrylate, isobornyl acrylate, isooctyl acrylate, tetrahydrofuran acrylate, and acrylamide; and/or the trifunctional acrylate includes at least one of tri(hydroxymethyl)propane triacrylate and pentaerythritol triacrylate.

In some possible implementations, the photoinitiator includes at least one of photoinitiator TPO, photoinitiator 819, photoinitiator 907, photoinitiator ITX, photoinitiator 369, and photoinitiator DETX.

In some possible implementations, the photoinitiator includes at least one of the photoinitiator TPO, the photoinitiator 819, and the photoinitiator DETX.

In some possible implementations, the additive includes: at least one of a silane coupling agent, a leveling agent, and an ultraviolet agent; the mass percentage of the silane coupling agent in the sunshade composition is 0.1% to 3%; the mass percentage of the leveling agent in the sunshade composition is 0.1% to 1.5%; the mass percentage of the ultraviolet agent in the sunshade composition is 0.1% to 1%.

On the other hand, a method for preparing a light-shielding composition is also provided, and the light-shielding composition is as shown in any of the above items; the method for preparing the light-shielding composition comprises: in a light-proof environment, uniformly stirring an acrylate monomer, a photoinitiator and an additive to form a first mixture; adding a polyurethane acrylate oligomer and a metal complex dye to the first mixture and uniformly stirring, and after pressure filtration, obtaining the light-curable light-shielding composition.

On the other hand, a display device is provided, wherein the display device has a light-shielding material, wherein the light-shielding material is prepared by photocuring using any of the light-shielding compositions shown above, or is prepared by the preparation method shown above.

The beneficial effects of the technical solution provided by the embodiment of the present invention include at least: the photocurable shading composition provided by the embodiment of the present invention can be used to prepare a shading material for a display device, and the shading composition includes a metal complexing dye, which has good compatibility with both polyurethane acrylate oligomers and acrylate monomers. Without using a dispersant, the metal complexing dye can be fully and evenly dispersed in the shading composition, presenting a highly uniform and highly durable color. The metal complexing dye includes at least two of a blue dye, a red dye, and a purple dye. This dye combination can make the color of the prepared shading material appear blue-black or blue-purple, so that the shading material has a higher optical density.

In addition, metal complex dyes also have the following characteristics: they do not absorb light sources with ultraviolet wavelengths, but can transmit visible light with wavelengths above 400nm (which can meet the appearance color without affecting the curing performance of the shading composition), high dispersibility, permeability, weather resistance, and color fastness, which makes the metal complex dyes not affect the curing process of the shading composition. Studies have found that by making the reasonably proportioned polyurethane acrylate oligomers, acrylate monomers, photoinitiators, additives and metal complex dyes work synergistically, the cured shading material can show excellent comprehensive performance. Among them, the comprehensive properties of the shading material include but are not limited to: high curing degree, high optical density, sufficient hardness and tensile length, strong adhesion, releasability, water vapor resistance, solvent resistance, aging resistance, high temperature and high humidity resistance, etc.

In order to make the technical solution and advantages of this application clearer, the implementation method of this application will be described in further detail below.

As the display screens of electronic devices such as smartphones, computers, and televisions gradually develop towards bezel-less full-screen, more and more bezel-less displays are widely used. The side of the display screen of the bezel-less display is not provided with a module frame, so that its side is not blocked. Therefore, the backlight leaks through the side of the upper and lower glass substrates and the gap between them. In order to prevent the backlight from leaking through the side of the upper and lower glass substrates and the gap between them, side shading materials are usually applied to the frame area outside the operable area of the display screen to achieve a shading effect.

For the side shading material, it is expected that the side shading material has at least the following properties: high optical density (OD), sufficient hardness and tensile length, strong adhesion, removability (easy to repair), water vapor resistance, high temperature and humidity resistance, cold and hot shock resistance, etc. In addition, in the production process of the display, the side shading material is required to be able to achieve simultaneous curing while applying glue, so the side shading material is usually UV-curable.

Currently common UV-curable shading materials usually contain black pigment and optional black dye, wherein the black pigment can be carbon black, and black pigment or black pigment and black dye are used to achieve darkening.

However, black pigments such as carbon black are difficult to disperse evenly in the light-shielding material system. It is even necessary to add a dispersant to the system to make the black pigment evenly dispersed. This will not only affect the curing performance of the system, but also affect the comprehensive performance of the light-shielding material formed after curing.

The present invention provides a sunshade composition, which includes the following components in mass percentage: 40% to 60% polyurethane acrylate oligomer, 30% to 40% acrylate monomer, 3% to 10% photoinitiator, 0.3% to 5.5% additive, and 0.5% to 1.5% metal complex dye.

The metal complex dye includes at least two of blue dye, red dye and purple dye, and the absorption wavelength of the metal complex dye is greater than 400nm.

The shading composition provided by the embodiment of the present invention can be used to prepare a shading material for shading a display device. The shading composition includes a metal complex dye. The metal complex dye has good compatibility with polyurethane acrylate oligomers and acrylate monomers. The metal complex dye can be fully and evenly dispersed in the shading composition without using a dispersant, presenting a highly uniform and highly durable color. The metal complex dye includes at least two of a blue dye, a red dye, and a purple dye. This dye combination can make the color of the prepared shading material appear blue-black or blue-purple, so that the shading material has a higher optical density.

In addition, metal-complex dyes also have the following characteristics: they do not absorb light sources with ultraviolet wavelengths, but can transmit light with a wavelength greater than 400nm, have high dispersibility, permeability, weather resistance, and color fastness, which means that metal-complex dyes will not affect the curing process of the shading composition. Studies have found that through the synergistic effect of reasonably proportioned polyurethane acrylate oligomers, acrylate monomers, photoinitiators, additives, and metal-complex dyes, the shading material formed by curing the shading composition can show excellent comprehensive performance. Among them, the comprehensive performance of the shading material includes but is not limited to: high degree of curing, high optical density, sufficient hardness and tensile elongation, strong adhesion, releasability, water vapor resistance, solvent resistance, aging resistance, high temperature and humidity resistance, etc.

In the embodiment of the present invention, the mass percentage of the metal complex dye in the sunshade composition is 0.5% to 1.5%, which includes but is not limited to 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, and 1.5%.

It is expected that the metal complex dye can transmit ultraviolet light (for example, 300nm~420nm LED light source), but not visible light. The blue dye, red dye, and purple dye that meet the above requirements are as follows:

Exemplarily, the blue dye includes at least one of Solvent Blue 5 and Solvent Blue 70.

Exemplarily, the red dye includes at least one of Solvent Red 8, Solvent Red 122, Solvent Red 119, Solvent Red 132, and Solvent Red 124.

Exemplarily, the purple dye includes at least one of Solvent Violet 58 and (CFT) Triamet Violet 5R.

At least two of the above-mentioned blue dyes, red dyes, and purple dyes are combined and work together with other components to make the cured shading material present the desired blue-black or blue-purple color and have a high OD value.

For example, the metal complex dye can be a combination of any two of blue dye, red dye, and purple dye, or a combination of three of blue dye, red dye, and purple dye. The specific components of the metal complex dye and the content of each component can be adjusted according to the color you want to present.

In the embodiment of the present invention, the mass percentage of polyurethane acrylate oligomer in the light-shielding composition is 40% to 60%, including but not limited to 40%, 42%, 45%, 48%, 50%, 52%, 54%, 55%, 56%, 57%, 58%, 59%, 60%.

The curing system formed by polyurethane acrylate oligomers, acrylate monomers and photoinitiators can be cured under UV light to form a polymer network with a relatively fast curing speed.

In some examples, the functionality of the polyurethane acrylate oligomer is 2-3, and the weight average molecular weight is 1500-6000, which includes at least one of polyether polyurethane (which is beneficial to increase the elasticity and softness of the film), polyester polyurethane (which makes the film excellent in water resistance, high temperature and high humidity resistance, and is beneficial to increase strength), polycarbonate polyurethane (which is beneficial to increase the adhesion between the film and the substrate), and polybutadiene polyurethane (which is beneficial to reduce moisture permeability and water absorption). For example, it includes at least one of polyester polyurethane and polybutadiene polyurethane.

For example, the molecular weight of the polyurethane acrylate oligomer can be 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000.

For example, the polyether polyurethane is prepared from polyether polyol, diisocyanate and hydroxy acrylate in a molar ratio of 1:2:2 or 1:3:3, and the molecular weight of the polyether polyol is 1000-5000.

For example, the polycarbonate polyurethane is prepared from polycarbonate diol, diisocyanate and hydroxy acrylate in a molar ratio of 1:2:2, and the molecular weight of the polycarbonate diol is 500-2000.

Exemplarily, the polyester polyurethane is prepared from a branched polyester polyol, a diisocyanate and a hydroxy acrylate in a molar ratio of 1:2:2 or 1:3:3, and the molecular weight of the branched polyester polyol is 500-2000.

Exemplarily, the polybutadiene polyurethane is prepared from polybutadiene polyol, diisocyanate and hydroxy acrylate in a molar ratio of 1:2:2 or 1:3:3, and the molecular weight of the polybutadiene polyol is 1000-3000.

Exemplarily, diisocyanates include but are not limited to toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), etc.

Exemplarily, hydroxy acrylates include but are not limited to hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, polyethylene glycol monomethacrylate, and phenyl glycidyl ether acrylate.

In the embodiment of the present invention, the acrylic monomer is a UV monomer, and its mass percentage in the sunshade composition is 30% to 40%, including but not limited to 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%.

In some examples, the acrylate monomers suitable for use in the embodiments of the present invention include at least one monofunctional acrylate and at least one trifunctional acrylate.

In some examples, the monofunctional acrylate includes at least one of lauryl acrylate (LA), isobornyl acrylate (IBOA), isooctyl acrylate (2-EHA), tetrahydrofuran acrylate (THFA), and 4-acryloylmorpholine (ACMO). The trifunctional acrylate includes at least one of tri(hydroxymethyl)propane triacrylate (TMPTA) and pentaerythritol triacrylate (PET3A), and the mass percentage of the trifunctional acrylate in the shading composition is 1% to 5%. For example, the mass percentage of the trifunctional acrylate in the shading composition can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.

In some examples, the monofunctional acrylate includes at least one of lauryl acrylate, isooctyl acrylate, and 4-acryloylmorpholine. Further, the monofunctional acrylate includes at least two of lauryl acrylate, isooctyl acrylate, and 4-acryloylmorpholine.

When the monofunctional acrylate includes lauryl acrylate, the mass percentage of lauryl acrylate in the monofunctional acrylate is at least 20%. When the monofunctional acrylate includes isooctyl acrylate, the mass percentage of isooctyl acrylate in the monofunctional acrylate is at least 10%. When the monofunctional acrylate includes acrylamide, the mass percentage of acrylamide in the monofunctional acrylate is less than 30%.

The acrylate monomer is a combination of the monofunctional acrylate and trifunctional acrylate shown above, and the mass percentage of the trifunctional acrylate in the shading composition is 1%~5%. This combination works together with the above-mentioned polyurethane acrylate oligomer to further optimize the following comprehensive properties of the shading material: high curing degree, high optical density, sufficient hardness and elongation, strong adhesion, releasability, water vapor resistance, solvent resistance, aging resistance, high temperature and humidity resistance, etc.

In the embodiment of the present invention, the mass percentage of the photoinitiator in the light-shielding composition is 3% to 10%, including but not limited to 3%, 4%, 5%, 6%, 7%, 8%, 9%, and 10%.

In some examples, the photoinitiator applicable to the embodiment of the present invention includes: at least one of the photoinitiator TPO (2,4,6 (trimethylbenzyl) diphenylphosphine oxide), photoinitiator 819 (phenyl bis (2,4,6-trimethylbenzyl) phosphine oxide), photoinitiator 907 (2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-acetone), photoinitiator ITX (2-isopropylthioxanthrone), photoinitiator 369 (2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl) butanone), and photoinitiator DETX (2,4-diethylthioxanthrone).

Further, the photoinitiator includes at least one of the photoinitiator TPO, the photoinitiator 819, and the photoinitiator DETX. Further, the photoinitiator includes at least the photoinitiator TPO, and at least one of the photoinitiator 819 and the photoinitiator DETX, that is, at least the combination of the photoinitiator TPO + the photoinitiator 819, or the combination of the photoinitiator TPO + the photoinitiator DETX, or the combination of the photoinitiator TPO + the photoinitiator 819 + the photoinitiator DETX.

When the photoinitiator includes photoinitiator TPO, the mass percentage of photoinitiator TPO in the photoinitiator is at least 30%. When the photoinitiator includes photoinitiator 819, the mass percentage of initiator 819 in the photoinitiator is less than or equal to 35%. When the photoinitiator includes photoinitiator DETX, the mass percentage of initiator DETX in the photoinitiator is less than or equal to 35%.

By setting up the photoinitiator system as above, a better initiation effect is obtained for the above-mentioned polyurethane acrylate oligomer and acrylate monomer system, which is suitable for LED lamp curing, which is beneficial to improve the curing speed and curing degree of the system, and can meet the process and curing performance requirements of making the light-shielding composition quickly cure while dispensing glue.

In some examples, the additives in the sunscreen composition provided by the embodiments of the present invention include: at least one of a silane coupling agent, a leveling agent, and a UV agent.

The mass percentage of the silane coupling agent in the sunshade composition is 0.1% to 3%, for example, 0.1%, 0.2%, 0.5%, 0.7%, 1%, 1.3%, 1.5%, 1.8%, 2%, 2.3%, 2.5%, 2.6%, 2.8%, 3%.

Exemplarily, the silane coupling agent includes but is not limited to: at least one of γ-aminopropyl triethoxysilane (silane coupling agent KH-550), γ-(2,3-epoxypropyl)propyl trimethoxysilane (silane coupling agent KH-560), γ-methacryloyloxypropyl trimethoxysilane (silane coupling agent KH-570), and 3-butyl triethoxysilane (silane coupling agent KH-580). The above-mentioned silane coupling agent can increase the adhesion or bonding force of the shading material to the substrate.

The mass percentage of the leveling agent in the sunshade composition is 0.1%~1.5%, for example, 0.1%, 0.2%, 0.5%, 0.7%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%.

Exemplarily, the leveling agent includes but is not limited to organic silicon leveling agent and acrylic leveling agent. For example, organic silicon leveling agent includes but is not limited to BYK333, BYK331, BYK346, ETA~735, and acrylic leveling agent includes but is not limited to BYK354, BYK358, BYK361. By using the above-mentioned leveling agent, the shading composition can form a flat, smooth, and uniform film material, which is conducive to optimizing the hardness, tensile length and other properties of the shading material.

The mass percentage of the ultraviolet agent in the sunshade composition is 0.1% to 1%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%. For example, the ultraviolet agent can be at least one of Tinuvin 292, Tinuvin 1130, Tinuvin 123, Tinuvin 329, Tinuvin 405, Tinuvin 770, and Tinuvin 622. The ultraviolet agent can not only increase the storage stability of the system, but also work synergistically with other components to increase the comprehensive performance of the sunshade material.

In summary, according to the formula of the shading composition provided in the embodiment of the present invention, the shading material can satisfy the requirements of obtaining a higher OD value at a thinner thickness, and also satisfy the curing performance at a larger thickness, and is suitable for shading compositions with a thickness of more than 200 μm for display screens such as computers or televisions, while obtaining a higher degree of curing; and effectively improves the hardness, tensile elongation, water absorption and moisture permeability of the shading material.

The shading composition provided in the embodiment of the present invention can be cured into a film in the following manner: the shading composition is coated on a substrate (such as glass) using a glue dispenser (coating pressure is 0.05MPa, coating temperature is 45~50℃), and the shading composition is cured with an LED light source with a wavelength of 365nm~405nm and an energy of 800MJ/cm2~1500MJ/cm2, so that the shading composition is cured into a film, and the thickness of the prepared shading film material can be 100μm~500μm.

On the other hand, the present invention also provides a method for preparing a light-shielding composition, and the light-shielding composition is as shown in any of the above.

The preparation method of the light-shielding composition includes: in a light-proof environment, uniformly stirring an acrylic monomer, a photoinitiator and an additive to form a first mixture.

For example, the acrylate monomer, photoinitiator and additive are stirred evenly at 40°C to 45°C to completely dissolve the photoinitiator. During the stirring, the stirring frequency can be 30HZ to 35HZ.

The polyurethane acrylate oligomer, metal complex dye and the first mixture are uniformly stirred, and after pressure filtration, a sunshade composition is obtained.

Add polyurethane acrylate oligomer and metal complex dye to the first mixture and stir evenly, and obtain a sunshade composition after pressure filtration.

For example, the polyurethane acrylate oligomer is preheated to 40°C to 45°C and then added to the first mixture for stirring. The stirring time may be 2 to 3 hours to ensure that the sunscreen composition is stirred evenly.

During pressurized filtration, the pressure can be less than or equal to 0.1MPa, and the temperature during filtration can be 40℃~45℃.

The light-shielding composition provided in the embodiment of the present invention can be photocured to form a film-like light-shielding material.

On the other hand, the embodiment of the present invention also provides a display device having a light-shielding material, wherein the light-shielding material is prepared by photocuring the light-shielding composition as shown in the embodiment of the present invention, or is prepared by the preparation method shown in the embodiment of the present invention.

For example, the display device is a display panel, which includes an upper substrate and a lower substrate arranged opposite to each other, and the light-shielding composition is coated on the sides of the upper substrate and the lower substrate and the gap between the upper substrate and the lower substrate.

In some examples, display panels are used in electronic devices such as smartphones, computers, and televisions.

The preferred embodiments of the present invention are described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described here. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this field or the product instructions shall be followed. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially. In the following embodiments, if not clearly stated, "%" refers to weight percentage.

The shading compositions involved in the following Examples 1 to 5 are prepared by the following method: In a light-proof environment, acrylate monomers, photoinitiators and additives are added to a reactor, heated to 45°C, and stirred at a frequency of 35HZ until the photoinitiator is completely dissolved. Then, polyurethane acrylate oligomers heated to 45°C are added to the reactor, and then metal complex dyes are added to the reactor, and stirring is continued for 3 hours until the shading composition system is uniformly dissolved. Then, the shading composition system is pressure filtered (pressure equal to 0.1MPA, temperature is 40°C), and finally a uniform shading composition is obtained.

The polyurethane acrylate oligomers involved in the following embodiments are as follows: a difunctional polyester polyurethane acrylate is prepared from polyester diol, isophorone diisocyanate and hydroxyethyl acrylate in a molar ratio of 1:2:2, and its weight average molecular weight is 1600; a difunctional polybutadiene polyurethane acrylate is prepared from polybutadiene diol, isophorone diisocyanate and hydroxyethyl acrylate in a molar ratio of 1:2:2, and its weight average molecular weight is 2200; a difunctional polyether polyurethane acrylate is prepared from polyether diol, toluene diisocyanate and polyethylene glycol monomethacrylate in a molar ratio of 1:2:2, and its weight average molecular weight is 2600; a difunctional polycarbonate polyurethane acrylate is prepared from polycarbonate monomethacrylate in a molar ratio of 1:2: 2 polycarbonate diol, toluene diisocyanate and polyethylene glycol monomethacrylate, and its weight average molecular weight is 1600; trifunctional polyester type polyurethane acrylate is prepared from polyester triol, isophorone diisocyanate and polyethylene glycol monomethacrylate with a molar ratio of 1:3:3, and its weight average molecular weight is 3000; trifunctional polybutadiene type polyurethane acrylate is prepared from polybutadiene triol, toluene diisocyanate and hydroxypropyl acrylate with a molar ratio of 1:3:3, and its weight average molecular weight is 4000; trifunctional polyether type polyurethane acrylate is prepared from polyether triol, isophorone diisocyanate and hydroxypropyl acrylate with a molar ratio of 1:3:3, and its weight average molecular weight is 4500;

The formulas of the sunscreen compositions provided in Example 1, Example 2, Example 3, Example 4, and Example 5 are respectively shown in Table 1, Table 2, Table 3, Table 4, and Table 5 below.

Test example: The light-shielding composition provided in Examples 1 to 5 was coated on a glass substrate using a glue dispenser (coating pressure was 0.05 MPa, coating temperature was 45°C), and a LED light source with a wavelength of 405 nm was used to perform photocuring at an energy of 800 MJ/cm2 to prepare a light-shielding film material 1 with a thickness of 100 um, and a light-shielding film material 2 with a thickness of 400 um was prepared by performing photocuring at an energy of 1350 MJ/cm2.

The performance of the shading compositions provided in Examples 1 to 5, as well as the shading film materials 1 and shading film materials 2 prepared from these shading compositions, were tested. The specific test items and test methods are as follows:

Viscosity: The viscosity of the light-shielding composition was measured using a Bolifei rotary viscometer, with a 34# rotor, at 25°C. Optical density OD value: For light-shielding film materials, an ultraviolet spectrophotometer was used to test the average transmittance T% under a wavelength of 400nm~700nm. The calculation formula for the OD value is as follows: OD=log10(1/T%). The larger the OD value, the better the light-shielding property. Generally, an OD value>0.5 is required. Degree of curing: An infrared spectrometer was used for testing. , the double-key conversion rate of the shading composition before and after curing, the degree of curing is required to be >90%; resistance value: the resistance value of the shading film material is tested using a surface resistivity meter. The resistance value represents the insulation performance of the shading material. Generally, the higher the better, and it is required to be greater than 1012; hardness: the hardness of the shading film material is tested using a Shore A or D hardness tester. The hardness corresponding to the film thickness of 4mm is required to be measured. In order to meet the test thickness, multiple layers of shading film materials are generally stacked. The hardness (D>A, if the same Level 1, the larger the value, the higher the hardness); Tensile strength: Use a universal tensile testing machine to test the tensile strength of the shading film material (sensor 50N pressure, pulling speed 50mm/min); Adhesion: Use a universal tensile testing machine to test the adhesion of the shading film material, the stretching direction is 90° to the substrate (sensor 50N pressure, pulling speed 50mm/min); Aging performance: Test the shading film material in a high and low temperature alternating humidity and heat test chamber, ~40℃, 500h; 85 ℃, 500h; from ~40℃ to 85℃ hot and cold shock for more than 500 cycles, the color and OD value must not change after the test; high temperature and humidity resistance: 85℃, 85%RH, more than 500h, the color and OD value must not change after the test; solvent resistance: 95% or more pure alcohol, 500g load, wipe 100 times, no fading and damage; water absorption rate: film thickness*5cm*5cm, soak in pure water at room temperature for 24h, weigh the weight change before and after soaking, and the requirement is <1%.

The water absorption rate calculation formula is as follows: Water absorption rate = (m2~m1)/m1*100%; m1: the weight of the shading film material before immersion; m2: the weight of the shading film material after immersion; Moisture permeability: Use a moisture permeability cup for testing, conditions: 65℃*95%RH*24h, desiccant (anhydrous calcium chloride), requirement <100g/m2.

The moisture permeability calculation formula is as follows: moisture permeability = (m2~m1)/S; m1: weight of desiccant before moisture permeability test; m2: weight of desiccant after moisture permeability test; S: diameter of moisture permeability cup (diameter is 10 cm); wherein, the performance parameters of light shielding film material 1 (abbreviated as 1#) and light shielding film material 2 (abbreviated as 2#) prepared in Examples 1 to 5 are shown in Table 6:

As shown in Table 6, the shading compositions prepared in the embodiments of the present invention all exhibit excellent comprehensive performance. In particular, when the thickness of the shading film material is 100 μm, it still has an optical density OD value of at least 0.8, and when the thickness of the shading film material is 400 μm, it still has a curing degree of at least 93%, which effectively solves the technical difficulties of the current shading material that it cannot have a higher OD value at a thinner thickness and cannot have a higher curing degree at a thicker thickness.

The above is only to facilitate technical personnel in this field to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims (9)

A sunshade composition, characterized in that the sunshade composition comprises the following components in mass percentage: 40% to 60% polyurethane acrylate oligomer, 30% to 40% acrylate monomer, 3% to 10% photoinitiator, 0.3% to 5.5% additive, and 0.5% to 1.5% metal complex dye; wherein the metal complex dye comprises at least two of blue dye, red dye, and purple dye; the blue dye comprises at least one of solvent blue 5 and solvent blue 70; and/or the red dye comprises at least one of solvent red 8, solvent red 122, solvent red 119, solvent red 132, and solvent red 124; and/or the purple dye comprises at least one of solvent violet 58 and Triamet Violet 5R; and the sunshade composition does not contain a dispersant. The light-shielding composition as described in claim 1, wherein the functionality of the polyurethane acrylate oligomer is 2-3 and the weight average molecular weight is 1500-6000; and/or the polyurethane acrylate oligomer includes at least one of polyether polyurethane, polyester polyurethane, polycarbonate polyurethane, and polybutadiene polyurethane. A sunshade composition as described in any one of claim 1 to 2, wherein the acrylate monomer includes at least one monofunctional acrylate and at least one trifunctional acrylate; and/or the mass percentage of the trifunctional acrylate in the sunshade composition is 1% to 5%. The light-shielding composition as described in claim 2, wherein the monofunctional acrylate includes at least one of lauryl acrylate, isobornyl acrylate, isooctyl acrylate, tetrahydrofuran acrylate, and acrylamide; and/or the trifunctional acrylate includes at least one of tri(hydroxymethyl)propane triacrylate and pentaerythritol triacrylate. The light-shielding composition as described in claim 1, wherein the photoinitiator includes at least one of photoinitiator TPO, photoinitiator 819, photoinitiator 907, photoinitiator ITX, photoinitiator 369, and photoinitiator DETX. The light-shielding composition as described in claim 5, wherein the photoinitiator includes at least one of the photoinitiator TPO, the photoinitiator 819, and the photoinitiator DETX. A sunshade composition as described in any one of claim 1, wherein the additive comprises: at least one of a silane coupling agent, a leveling agent, and an ultraviolet agent; the mass percentage of the silane coupling agent in the sunshade composition is 0.1% to 3%; the mass percentage of the leveling agent in the sunshade composition is 0.1% to 1.5%; and the mass percentage of the ultraviolet agent in the sunshade composition is 0.1% to 1%. A method for preparing a light-shielding composition, characterized in that the light-shielding composition is as shown in any one of claim items 1 to 7; the method for preparing the light-shielding composition comprises: in a light-proof environment, uniformly stirring an acrylate monomer, a photoinitiator and an additive to form a first mixture; and adding a polyurethane acrylate oligomer and a metal complex dye to the first mixture and uniformly stirring, and after pressure filtration, obtaining the light-curable light-shielding composition. A display device, characterized in that: the display device has a light-shielding film material, wherein the light-shielding film material is prepared by photocuring the light-shielding composition described in any one of claim items 1 to 7, or is prepared by the preparation method described in claim item 8.