Adhesive composition, adhesive layer and display panel

Abstract

The application discloses a glue composition, a glue layer and a display panel. The glue composition comprises an acrylic monomer, an initiator and a hyperbranched organosilicon resin; wherein the hyperbranched organosilicon resin contains an organosilicon skeleton structure. The application increases the hyperbranched organosilicon resin in the glue composition, and the hyperbranched organosilicon resin contains the organosilicon skeleton structure. The atomic mass and atomic density of silicon atoms are relatively small, thereby effectively reducing the refractive index of the glue layer prepared from the glue composition, and the organosilicon skeleton can make the glue layer have relatively high hardness and rigidity, and improve the mechanical properties and scratch resistance of the glue layer. In addition, the hyperbranched organosilicon resin has a large number of branches, thereby further improving the mechanical properties of the glue layer after the glue composition is crosslinked and solidified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a glue composition, a glue layer and a display panel. BACKGROUND

[0002] Reflection light has a relatively serious impact on the display quality of the display panel, reduces the relative brightness and contrast of the display panel, and thus it is crucial to reduce the reflection light to improve the display quality of the display panel.

[0003] At present, a low refractive index glue material is usually coated in the display panel, and a reflection reduction film layer is obtained after curing. Since the low refractive index glue material contains mesoporous silica nanoparticles, the mechanical properties of the formed reflection reduction film are poor and are easy to be scratched. SUMMARY

[0004] The present application provides a glue composition, a glue layer and a display panel, which can effectively improve the rigidity and hardness of the glue layer prepared from the glue composition, and improve the scratch resistance of the glue layer.

[0005] The present application provides a glue composition, which comprises an acrylic monomer, an initiator and a hyperbranched silicone resin.

[0006] The hyperbranched silicone resin contains a silicone skeleton structure.

[0007] In an embodiment of the present application, the hyperbranched silicone resin contains a plurality of branched chains, and the end groups of the branched chains are mercapto groups.

[0008] In an embodiment of the present application, the hyperbranched silicone resin contains a fluorocarbon chain connected to the silicone skeleton structure, and at least part of the carbon atoms in the fluorocarbon chain are substituted with fluorine atoms.

[0009] In an embodiment of the present application, the mass fraction of the acrylic monomer in the glue composition is 10-20 parts, the mass fraction of the initiator in the glue composition is 2-10 parts, and the mass fraction of the hyperbranched silicone resin in the glue composition is 20-50 parts.

[0010] In an embodiment of the present application, the structural formula of the hyperbranched silicone resin is as follows:

[0011]

[0012] wherein a is greater than or equal to 10 and less than or equal to 50, b is greater than or equal to 2 and less than or equal to 10, c is greater than or equal to 2 and less than or equal to 10, d is greater than or equal to 10 and less than or equal to 50, n is greater than or equal to 1 and less than or equal to 15.

[0013] In one embodiment of the present application, the hyperbranched silicone resin has a molecular weight greater than or equal to 5000 and less than or equal to 30000.

[0014] In one embodiment of the present application, the glue composition further comprises a leveling aid, and the mass fraction of the leveling aid in the glue composition is 0.1-2 parts.

[0015] According to the above-mentioned purposes of the present application, the embodiment of the present application further provides a glue layer prepared by using the glue composition.

[0016] In one embodiment of the present application, the glue layer has a refractive index greater than or equal to 1.25 and less than or equal to 1.35.

[0017] According to the above-mentioned purposes of the present application, the embodiment of the present application further provides a display panel comprising the glue layer.

[0018] The present application has the following beneficial effects: by adding the hyperbranched silicone resin in the glue composition, and the hyperbranched silicone resin comprises the silicone skeleton, the atomic mass and atomic density of the silicon atom are small, thereby effectively reducing the refractive index of the glue layer prepared from the glue composition, and the silicone skeleton can also make the glue layer have high hardness and rigidity, thereby improving the mechanical properties and scratch resistance of the glue layer; in addition, the hyperbranched silicone resin has a large number of branches, thereby further improving the mechanical properties of the glue layer after the glue composition is crosslinked and cured. BRIEF DESCRIPTION OF DRAWINGS

[0019] The technical solutions and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application, combined with the accompanying drawings.

[0020] Figure 1 A structural schematic diagram of the display panel provided by the embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solutions and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application, combined with the accompanying drawings.

[0022] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0023] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of the application. For the purpose of simplifying the disclosure, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the application. In addition, the application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0025] The embodiment of the application provides a glue composition, the glue composition comprises an acrylic monomer, an initiator and a hyperbranched silicone resin.

[0026] The hyperbranched silicone resin contains a silicone skeleton structure.

[0027] In the implementation application process, the embodiment of the present application can effectively reduce the refractive index of the glue layer prepared by the glue composition by increasing the hyperbranched silicone resin in the glue composition, and the atomic mass and atomic density of the silicon atom in the hyperbranched silicone resin are small, and the silicone skeleton can also make the glue layer have high hardness and rigidity, and improve the mechanical properties and scratch resistance of the glue layer. In addition, the hyperbranched silicone resin has a large number of branches, which can further improve the mechanical properties of the glue layer after the glue composition is cross-linked and cured.

[0028] Specifically, the glue composition provided by the embodiment of the present application comprises an acrylic monomer, an initiator, a leveling aid, a hyperbranched silicone resin and a solvent.

[0029] In an embodiment, the acrylic monomer can be a multifunctional acrylic monomer; the initiator can be a photoinitiator, for example, it can be 1-hydroxycyclohexyl phenyl ketone or other photoinitiators in the ultraviolet light curing process; the leveling aid can be an acrylate leveling aid; and the solvent can be butyl acetate or methyl isobutyl ketone.

[0030] In the embodiment of the present application, the hyperbranched silicone resin comprises a silicone skeleton, wherein the atomic mass and atomic density of the silicon element are small, thereby effectively reducing the refractive index of the glue layer prepared by the glue composition provided by the embodiment of the present application, and the silicone skeleton can make the glue layer have high hardness and rigidity, and improve the mechanical properties and scratch resistance of the glue layer.

[0031] In an embodiment, the hyperbranched silicone resin comprises a fluorocarbon chain connected to the silicone skeleton structure, and at least part of the carbon atoms in the fluorocarbon chain are substituted with fluorine atoms. Since fluorine atoms have very strong hydrophobicity, they can repel hydrophobic and oleophobic surfaces, thereby the glue layer prepared by the glue composition provided by the embodiment of the present application has good antifouling performance.

[0032] Further, in an embodiment, the end group of the hyperbranched silicone resin is a mercapto group, and therefore in the subsequent curing process of the glue composition, the mercapto group can be used for photo-curing reaction by click chemistry, which has fast reaction speed, high efficiency and high conversion rate, and can better improve the cross-linking degree compared with ordinary double bond photo-curing, thereby realizing good wear resistance and other mechanical properties of the glue layer. On this basis, the hyperbranched silicone resin has a large number of branches, and the end groups of the branches are mercapto groups, i.e. the mercapto groups formed at the ends of the branches, thereby the glue composition can further improve the cross-linking degree in the photo-curing process, further improve the hardness and rigidity of the prepared glue layer, and improve the mechanical properties and scratch resistance of the glue layer.

[0033] In an embodiment, the acrylic monomer is present in the glue composition in a mass fraction of 10-20 parts, for example, it can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts; the initiator is present in the glue composition in a mass fraction of 2-10 parts, for example, it can be 2 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts; the hyperbranched silicone resin is present in the glue composition in a mass fraction of 20-50 parts, for example, it can be 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, or 50 parts; the leveling aid is present in the glue composition in a mass fraction of 0.1-2 parts, for example, it can be 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, or 2 parts; the rest can be solvent, and the mass fraction of the solvent can be 35-43 parts, for example, it can be 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, or 43 parts.

[0034] In an embodiment of the present application, the hyperbranched silicone resin has the following structural formula:

[0035]

[0036] wherein a is greater than or equal to 10 and less than or equal to 50, b is greater than or equal to 2 and less than or equal to 10, c is greater than or equal to 2 and less than or equal to 10, d is greater than or equal to 10 and less than or equal to 50, n is greater than or equal to 1 and less than or equal to 15, and the molecular weight of the hyperbranched silicone resin is greater than or equal to 5000 and less than or equal to 30000.

[0037] It should be noted that in the hyperbranched silicone resin provided in the embodiment of the present application, the silicone backbone structure can include a plurality of silicon atoms and a plurality of oxygen atoms alternately connected, and each silicon atom can also be connected to two methyl groups; and in the fluorocarbon chain, an acyloxy group is formed at one end of the fluorocarbon chain, and the end of the fluorocarbon chain forming the acyloxy group is connected to the silicone backbone; wherein the substituents on the carbon atoms in the fluorocarbon chain are all fluorine atoms, so as to effectively improve the antifouling performance of the glue layer prepared from the glue composition provided in the embodiment of the present application.

[0038] It should be noted that in the hyperbranched silicone resin provided in the embodiment of the present application, the silicone backbone structure can include a plurality of silicon atoms and a plurality of oxygen atoms alternately connected, and each silicon atom can also be connected to two methyl groups; and in the fluorocarbon chain, an acyloxy group is formed at one end of the fluorocarbon chain, and the end of the fluorocarbon chain forming the acyloxy group is connected to the silicone backbone; wherein the substituents on the carbon atoms in the fluorocarbon chain are all fluorine atoms, so as to effectively improve the antifouling performance of the glue layer prepared from the glue composition provided in the embodiment of the present application. represents a repeating unit formed by the connection of the silicone backbone (i.e. the silicon-containing segment) and the fluorocarbon chain in the molecular formula.

[0039] Further, the synthesis process of the above-mentioned silicone resin is as follows:

[0040]

[0041] Wherein, R can be alkyl or phenyl, when R is alkyl, the substance above the arrow can be 4-cyano-4-[[(dodecylthio)thiocarbonyl]thio]pentanoic acid, when R is phenyl, the substance above the arrow can be 4-cyano-4-[[(phenylthio)thiocarbonyl]thio]pentanoic acid; the substance above the arrow is the middle dithioester, which has a very high chain transfer index, thus can reduce the free radical concentration in the system in the free radical polymerization, avoids the chain termination reaction, thus realizes the living polymerization, and improves the polymerization degree of the reaction; and the substance above the arrow can also be replaced by 2-(dodecylthiothiocarbonylthio)-2-methylpropanoic acid, methyl(phenyl)aminodithioic acid cyanomethyl ester, etc.

[0042] Correspondingly, the preparation process of the hyperbranched silicone resin comprises:

[0043] The 1H,1H-nonadecafluorodecyl acrylate (53.4 g, 0.1 mol), vinyl-terminated dimethyl polysiloxane (polymerization degree 2) (4.92 g, 0.02 mol), AIBN (1.64 g, 0.01 mol) and 4-cyano-4-[[(dodecylthio)thiocarbonyl]thio]pentanoic acid (1.01 g, 0.0025 mol) are dissolved in 500 mL of xylene, and are fully stirred and dissolved. The gas in the ampoule is removed by repeating three times of freezing-vacuumizing-melting (0.05 mmHg), and is vacuum-sealed. Subsequently, the sealed ampoule is placed into a heating oil bath (60 ℃), and the polymerization reaction is carried out for 16 hours; after the polymerization reaction is completed, an appropriate amount of sodium hydroxide acetonitrile solution (5 wt%, 100 ml) is added to fully reduce the dithioester, and finally the product is purified by using ether for three times of precipitation-dissolution-precipitation cycles, so that a hyperbranched silicone resin with a thiol end group and containing fluorine is obtained.

[0044] It should be noted that in the embodiment of the present application, in the above preparation process, the fluorine-containing monomer is 1H,1H-nonadecafluorodecyl acrylate, the silicon-containing monomer is vinyl-terminated dimethyl polysiloxane, and the greater the ratio of the fluorine-containing monomer to the silicon-containing monomer, the greater the molecular weight of the hyperbranched silicone resin, and the smaller the refractive index of the adhesive layer prepared from the adhesive composition.

[0045] Further, in an embodiment of the present application, the adhesive composition comprises 12 parts of an acrylic monomer, 5 parts of an initiator, 0.5 parts of a leveling aid, 40 parts of a hyperbranched silicone resin, and 43 parts of a solvent, and the solvent is butyl acetate; after the above adhesive composition is cured, the refractive index tested by an ellipsometer is 1.31, and the reflectivity is 550 nm / 0.51%.

[0046] In another embodiment of the present application, the glue composition comprises 15 parts of acrylic monomer, 6 parts of initiator, 0.5 parts of leveling aid, 45 parts of hyperbranched silicone resin, and 35 parts of solvent, and the solvent is methyl isobutyl ketone, and the glue composition after curing has a refractive index of 1.30 and a reflectivity of 550 nm / 0.49% tested by an ellipsometer.

[0047] It should be noted that the glue composition provided in the embodiments of the present application does not contain particle structures, such as scattering particle structures, specifically, silica particles. In contrast to the prior art, the addition of mesoporous silica nanoparticles in the glue composition will affect the mechanical properties of the glue layer and easily produce obvious haze. The glue composition provided in the embodiments of the present application does not contain particle structures, thereby avoiding the influence on the mechanical properties and the production of obvious haze, and effectively improving the light transmittance of the glue layer prepared from the glue composition.

[0048] As mentioned above, the embodiments of the present application add hyperbranched silicone resin to the glue composition, and the hyperbranched silicone resin includes a silicone skeleton. The atomic mass and atomic density of silicon atoms are small, thereby effectively reducing the refractive index of the glue layer prepared from the glue composition. The silicone skeleton also enables the glue layer to have high hardness and rigidity, thereby improving the mechanical properties and scratch resistance of the glue layer. In addition, the hyperbranched silicone resin has a large number of branched chains, and the branched chain ends have mercapto groups. Therefore, the mechanical properties of the glue layer can be further improved after the glue composition is crosslinked and cured. The hyperbranched silicone resin has multiple fluorine atoms. Fluorine atoms have very strong hydrophobicity and can form a hydrophobic and oleophobic surface, thereby having good antifouling properties. Therefore, the glue layer prepared from the glue composition provided in the embodiments of the present application has good antifouling properties.

[0049] According to the above-mentioned purposes of the present application, the embodiments of the present application also provide a glue layer prepared from the glue composition described in the above embodiments.

[0050] The hyperbranched silicone resin with mercapto end groups and multiple fluorine atoms in the glue composition enables the glue layer to have high hardness and rigidity, thereby improving the mechanical properties and scratch resistance of the glue layer and having good antifouling properties.

[0051] In one embodiment, the glue layer has a refractive index greater than or equal to 1.25 and less than or equal to 1.35.

[0052] In addition, please refer to Figure 1 The embodiments of the present application also provide a display panel comprising the glue layer described in the above embodiments.

[0053] In an embodiment, the display panel comprises a panel body 10 and a glue layer 20 arranged on the light-emitting side of the panel body 10, and the glue layer 20 is the glue layer in the above embodiment.

[0054] In the embodiment, the glue layer 20 covers the surface of the panel body 10, and has a low refractive index, which can reduce reflection and improve the brightness and contrast of the display panel, thereby improving the effect of the display panel.

[0055] Further, the glue layer 20 has high hardness and rigidity, good mechanical properties and scratch resistance, and good anti-fouling properties, and the glue layer 20 can further protect the panel body 10 after covering the surface of the panel body 10, thereby improving the stability and service life of the display panel.

[0056] In other embodiments of the present application, the glue layer 20 can be arranged inside the panel body 10 in addition to being arranged on the surface of the panel body 10, and is used to form an optical film layer, such as a condensing layer or a scattering layer in cooperation with a high-refractive layer, without limitation.

[0057] In summary, the embodiment of the present application adds hyperbranched silicone resin to the glue composition, and the hyperbranched silicone resin includes a silicone skeleton, and the atomic mass and atomic density of silicon atoms are small, thereby effectively reducing the refractive index of the glue layer made of the glue composition, and the silicone skeleton can make the glue layer have high hardness and rigidity, thereby improving the mechanical properties and scratch resistance of the glue layer. In addition, the hyperbranched silicone resin has a large number of branched chains, and the branched chain ends have mercapto groups, thereby further improving the mechanical properties of the glue layer after the glue composition is crosslinked and cured. The hyperbranched silicone resin has multiple fluorine atoms, and fluorine atoms have very strong hydrophobicity and can form a hydrophobic and oleophobic surface, thereby having good anti-fouling properties. Therefore, the glue layer made of the glue composition of the embodiment has good anti-fouling properties. When the glue layer made of the glue composition of the embodiment is applied to a display panel, it can effectively protect the display panel, and on the basis of reducing reflection to improve the display effect of the display panel, it can also effectively improve the stability and service life of the display panel.

[0058] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in an embodiment can be referred to the related description of other embodiments.

[0059] The above describes in detail the glue composition, the glue layer and the display panel provided by the embodiment of the present application. The principle and the implementation mode of the present application are described by using specific examples. The above embodiment is only used to help understand the technical solution and the core idea of the present application. Those skilled in the art should understand that the technical solution recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. The modification or the replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. An adhesive composition, characterized in that, The adhesive composition includes acrylic monomers, an initiator, and a hyperbranched silicone resin; The hyperbranched organosilicon resin contains an organosilicon framework structure, and the structural formula of the hyperbranched organosilicon resin is shown below: Where a is greater than or equal to 10 and less than or equal to 50, b is greater than or equal to 2 and less than or equal to 10, c is greater than or equal to 2 and less than or equal to 10, d is greater than or equal to 10 and less than or equal to 50, and n is greater than or equal to 1 and less than or equal to 15.

2. The adhesive composition according to claim 1, characterized in that, The acrylic monomer is present in 10-20 parts by weight in the adhesive composition, the initiator is present in 2-10 parts by weight in the adhesive composition, and the hyperbranched silicone resin is present in 20-50 parts by weight in the adhesive composition.

3. The adhesive composition according to claim 1, characterized in that, The hyperbranched silicone resin has a molecular weight greater than or equal to 5000 and less than or equal to 30000.

4. The adhesive composition according to claim 1, characterized in that, The adhesive composition further includes a leveling agent, and the leveling agent is present in the adhesive composition in parts by weight of 0.1 to 2 parts.

5. An adhesive layer, characterized in that, The adhesive layer is prepared using the adhesive composition as described in any one of claims 1 to 4.

6. The adhesive layer according to claim 5, characterized in that, The refractive index of the adhesive layer is greater than or equal to 1.25 and less than or equal to 1.

35.

7. A display panel, characterized in that, The display panel includes the adhesive layer as described in claim 5 or 6.

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