High-durability black shading material comprising porous carbon and low-refractive index nanoparticles and method for manufacturing the same

Abstract

The present invention provides a black light-shielding member comprising: a substrate layer; and a light-shielding layer formed on at least one surface of the substrate layer. The black light-shielding member according to the present invention maximizes light absorption efficiency and simultaneously improves light-shielding performance and wear resistance, and can secure even better scratch resistance and chemical resistance by forming a special surface coating layer on the surface of the light-shielding layer.

Description

Technology Field

[0001] The present invention relates to a highly durable black light-shielding material comprising porous carbon and low-refractive-index nanoparticles, and a method for manufacturing the same. Background Technology

[0002] Recently, black light-blocking materials applied to optical devices, smartphones, vehicle cameras, and AR / VR devices require the simultaneous control of high and low gloss, excellent blackness, durability, and processability. Prior art literature

[0003] Republic of Korea Registered Patent No. 10-2213137 The problem to be solved

[0004] The objective of the present invention is to provide a black light-shielding material that maximizes light absorption efficiency by optimally controlling the content of low-refractive-index nanoparticles in the light-shielding layer, simultaneously improves light-shielding performance and wear resistance by precisely controlling the porosity and particle size distribution of porous carbon, and ensures scratch resistance and chemical resistance by applying a special coating layer to the surface of the light-shielding layer.

[0005] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0006] To achieve the above objective, the present invention

[0007] Substrate layer; and

[0008] A black light-blocking member is provided, comprising a light-blocking layer formed on at least one surface of the above-mentioned substrate layer.

[0009] In addition, the light-blocking layer is characterized by being formed from a composition for forming a light-blocking layer comprising acrylic resin, porous carbon, and low-refractive-index nanoparticles.

[0010] In addition, the light-shielding layer is formed from a composition for forming a light-shielding layer comprising 38-42 parts by weight of acrylic resin, 28-32 parts by weight of porous carbon, and 28-32 parts by weight of low-refractive-index nanoparticles.

[0011] The above acrylic resin is an acrylic copolymer comprising 23-27 parts by weight of a methyl acrylate monomer unit, 23-27 parts by weight of a 2-methoxyethyl acrylate monomer unit, 23-27 parts by weight of a 2-hydroxy-3-((4-methoxyphenyl)diazenyl)-5-methylbenzyl methacylate monomer unit, and 23-27 parts by weight of a 1H,1H,5H-octafluoropentyl 2-fluoroacrylate monomer unit, and

[0012] The above porous carbon has an average particle size of 0.1-10 μm, and

[0013] The above low-refractive-index nanoparticles are characterized as magnesium fluoride nanoparticles with an average particle size of 1-100 nm.

[0014] In addition, the black light-blocking member includes a special surface coating layer formed on one surface of the light-blocking layer, and

[0015] The above surface special coating layer is characterized by being formed from a composition for forming a coating layer comprising 73-77 parts by weight of a silicone resin comprising 38-42 parts by weight of methyltrimethoxysilane monomer units, 28-32 parts by weight of 3-glycidoxypropyltrimethoxysilane monomer units, and 28-32 parts by weight of trimethoxy(1H,1H,2H,2H-heptadecafluorodecyl)silane monomer units, 18-22 parts by weight of calcium carbonate, 1-5 parts by weight of silver nanoparticles, 0.8-1.2 parts by weight of polydimethylsiloxane, and 0.8-1.2 parts by weight of isophorone diisocyanate.

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[0024] The black light-blocking member according to the present invention maximizes light absorption efficiency and simultaneously improves light-blocking properties and wear resistance, and can secure even better scratch resistance and chemical resistance by forming a special surface coating layer on the surface of the light-blocking layer. Specific details for implementing the invention

[0025] Various embodiments are described in more detail below. The embodiments described herein may be modified in various ways. Specific embodiments may be described in detail in the detailed description. However, the specific embodiments disclosed are intended only to facilitate understanding of various embodiments. Accordingly, the technical concept is not limited by the specific embodiments disclosed, and it should be understood that it includes all equivalents or substitutions that fall within the spirit and scope of the invention.

[0026] Terms including ordinal numbers, such as first, second, first, second, etc., may be used to describe various components, but these components are not limited by the aforementioned terms. The aforementioned terms are used solely for the purpose of distinguishing one component from another.

[0027] In this specification, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. When a component is described as being "connected" or "connected" to another component, it should be understood that it may be directly connected to or connected to that other component, or that there may be other components in between. On the other hand, when a component is described as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0028] Furthermore, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the invention, such detailed description is abbreviated or omitted.

[0029] The present invention

[0030] Substrate layer; and

[0031] A black light-blocking member is provided, comprising a light-blocking layer formed on at least one surface of the above-mentioned substrate layer.

[0032] Hereinafter, a black light-blocking member according to the present invention will be described in detail.

[0034] The above black light-blocking member includes a substrate layer.

[0035] The above substrate layer may be formed of a transparent or opaque material, and may be formed of a material such as resin, metal, and glass.

[0036] For example, the above-mentioned substrate layer may be a layer made of polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, copolymer of ethylene with 4 or more carbon atoms and α-olefins, polyesters such as polyethylene terephthalate, polyamides such as nylon, other general-purpose plastics such as ethylene-vinyl acetate copolymer, polyvinyl chloride, and polyvinyl acetate, or engineering plastics such as polycarbonate and polyimide.

[0037] In addition, the layer may be a metal substrate using metals such as gold, silver, copper, aluminum, titanium, zinc, beryllium, nickel, and tin, or an alloy substrate using alloys such as phosphor bronze, copper-nickel, copper-beryllium, stainless steel, brass, and duralumin.

[0038] In addition, it may be a layer using ultra-thin glass, etc.

[0039] The thickness of the above substrate layer may be 1-300 μm.

[0040] The above black light-shielding member includes a light-shielding layer. The light-shielding layer is formed on at least one surface of the substrate layer.

[0041] The light-shielding layer is preferably formed from a composition for forming a light-shielding layer comprising acrylic resin, porous carbon, and low-refractive-index nanoparticles, and is more preferably formed from a composition for forming a light-shielding layer comprising 38-42 parts by weight of acrylic resin, 28-32 parts by weight of porous carbon, and 28-32 parts by weight of low-refractive-index nanoparticles.

[0042] It is preferable to use an acrylic copolymer comprising 23-27 parts by weight of methyl acrylate monomer unit, 23-27 parts by weight of 2-methoxyethyl acrylate monomer unit, 23-27 parts by weight of 2-hydroxy-3-((4-methoxyphenyl)diazenyl)-5-methylbenzyl methacylate monomer unit, and 23-27 parts by weight of 1H,1H,5H-octafluoropentyl 2-fluoroacrylate monomer unit. By applying an acrylic copolymer comprising 23-27 parts by weight of methyl acrylate monomer unit, 23-27 parts by weight of 2-methoxyethyl acrylate monomer unit, 23-27 parts by weight of 2-hydroxy-3-((4-methoxyphenyl)diazenyl)-5-methylbenzyl methacylate monomer unit, and 23-27 parts by weight of 1H,1H,5H-octafluoropentyl 2-fluoroacrylate monomer unit as the above acrylic resin, excellent durability, flexibility, and adhesion can be provided, and excellent light-blocking properties can be secured.

[0043] It is preferable to use porous carbon with an average particle size of 0.1 to 10 μm, more preferable to use one with 1 to 5 μm, and most preferable to use one with 2 to 3 μm. By using a material having an average particle size within the above range as the porous carbon, strong blackness and light absorption functions are provided.

[0044] The low-refractive-index nanoparticles are preferably magnesium fluoride nanoparticles with an average particle size of 1-100 nm, more preferably magnesium fluoride nanoparticles with an average particle size of 30-70 nm, and most preferably magnesium fluoride nanoparticles with an average particle size of 45-55 nm. By applying magnesium fluoride nanoparticles having an average particle size within the above range as the low-refractive-index nanoparticles, it is possible to suppress surface diffuse reflection and achieve low gloss.

[0046] In addition, it is preferable that the black light-blocking member includes a special surface coating layer formed on one surface of the light-blocking layer.

[0047] The above surface special coating layer is preferably formed from a composition for forming a coating layer comprising 73-77 parts by weight of a silicone resin comprising 38-42 parts by weight of methyltrimethoxysilane monomer units, 28-32 parts by weight of 3-glycidoxypropyltrimethoxysilane monomer units, and 28-32 parts by weight of trimethoxy(1H,1H,2H,2H-heptadecafluorodecyl)silane monomer units, 18-22 parts by weight of calcium carbonate, 1-5 parts by weight of silver nanoparticles, 0.8-1.2 parts by weight of polydimethylsiloxane, and 0.8-1.2 parts by weight of isophorone diisocyanate.

[0048] The above surface special coating layer can exhibit excellent durability and adhesion by applying a silicone resin as the main resin, wherein the silicone resin comprises 38-42 parts by weight of methyltrimethoxysilane monomer, 28-32 parts by weight of 3-glycidoxypropyltrimethoxysilane monomer, and 28-32 parts by weight of trimethoxy(1H,1H,2H,2H-heptadecafluorodecyl)silane monomer.

[0049] The above silicone resin can be manufactured specifically by performing the following process. Specifically, raw materials for constituting each monomer unit are added to a reactor, and an organic solvent is added in an amount of 0.3 to 1.5 times the total weight of the monomers. Then, an appropriate amount of acidic solution is dropped to adjust the pH to between 1.0 and 5.5, and the mixture is stirred sufficiently and uniformly. The organic solvent is ethanol, methanol, butanol, xylene, butyl acetate, or acetone. Additionally, the acidic solution is hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, or acetic acid. Next, water is added in an amount of 0.1 to 1.0 times the total weight of the monomers described above, and the mixture is heated and circulated at a temperature of 50 to 80°C. Once the mixture changes to a single phase through the reaction and becomes completely transparent, it is kept warm for 1 to 6 hours. The pH is adjusted to between 5.5 and 6.5, the aforementioned solvent corresponding to 20% by weight of the solid content is added as a supplement, and after cooling, the resin is filtered to complete the resin.

[0050] The above calcium carbonate is used as a filler.

[0051] The above silver nanoparticles are applied as auxiliary fillers.

[0052] The above polydimethylsiloxane is used as a plasticizer.

[0053] The above isophorone diisocyanate is used as a crosslinking agent.

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[0062] In addition, the present invention

[0063] A product including the above-mentioned black light-blocking member is provided.

[0064] The black light-blocking member according to the present invention maximizes light absorption efficiency and simultaneously improves light-blocking properties and wear resistance, and can secure even better scratch resistance and chemical resistance by forming a special surface coating layer on the surface of the light-blocking layer.

[0066] The present invention will be explained in more detail below by the following examples.

[0067] However, the following examples are merely illustrative of the content of the invention, and the scope of the invention is not limited by the examples and experimental examples.

[0068] <Example 1> Preparation of a composition for forming a light-blocking layer-1

[0069] A composition for forming a light-blocking layer was prepared by mixing 40 parts by weight of an acrylic resin, which is polymethyl methacrylate, 30 parts by weight of porous carbon with an average particle size of 2.5 μm, and 30 parts by weight of magnesium fluoride nanoparticles with an average particle size of 50 nm.

[0070] <Example 2> Preparation of a composition for forming a light-blocking layer-2

[0071] A composition for forming a light-blocking layer was prepared by mixing 40 parts by weight of an acrylic resin, which is an acrylic copolymer comprising 25 parts by weight of a methyl acrylate monomer unit, 25 parts by weight of a 2-methoxyethyl acrylate monomer unit, 25 parts by weight of a 2-hydroxy-3-((4-methoxyphenyl)diazenyl)-5-methylbenzyl methacylate monomer unit, and 25 parts by weight of a 1H,1H,5H-octafluoropentyl 2-fluoroacrylate monomer unit, 30 parts by weight of porous carbon with an average particle size of 2.5 μm, and 30 parts by weight of magnesium fluoride nanoparticles with an average particle size of 50 nm.

[0072] <Experimental Example 1> Analysis of Characteristics of Black Light-Blocking Material

[0073] A light-shielding layer was formed using a polyethylene terephthalate film as a substrate layer using the light-shielding layer forming composition prepared in Examples 1 and 2 above, and the gloss, blackness, and adhesive strength of the black light-shielding material produced were analyzed, and the results are shown in Table 1 below.

[0074] Glossiness was measured according to JIS Z8741 as a specular glossiness at an angle of incidence of 60°, blackness was represented by the L value, which is the L* value representing lightness in the L*a*b* color space calculated based on JIS Z8781-4, and adhesive strength was obtained by measuring the resistance when a 31B tape (manufactured by Nitto Electric Co., Ltd.) attached to a light-shielding layer was peeled off in the 180° direction according to JIS Z0237.

[0075] Gloss 60°(%) Blackness L value Adhesion strength (N / 25mm) Example 1 0.1 6.5 5.8 Example 2 0.1 4.8 12.2

[0076] <Example 3> Preparation of a composition for forming a special surface coating layer-1

[0077] A composition for forming a coating layer was prepared comprising 75 parts by weight of a silicone resin containing 40 parts by weight of methyltrimethoxysilane monomer units, 30 parts by weight of 3-glycidoxypropyltrimethoxysilane monomer units, and 30 parts by weight of trimethoxy(1H,1H,2H,2H-heptadecafluorodecyl)silane monomer units, 20 parts by weight of calcium carbonate, 3 parts by weight of silver nanoparticles, 1 part by weight of polydimethylsiloxane, and 1 part by weight of isophorone diisocyanate.

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[0082] <Experimental Example 2> Analysis of the Characteristics of the Special Surface Coating Layer

[0083] A special surface coating layer was formed on the black light-shielding material (light-shielding layer formation of Example 2) prepared in Experimental Example 1 using the coating layer forming composition prepared in Example 3 above, and the adhesion, pencil hardness, and impact resistance characteristics of the manufactured material were analyzed, and the results are shown in Table 2 below.

[0084] Adhesion strength was determined by attaching an oriented polypropylene (OPP) tape to the surface of the material, peeling off the tape, and observing whether the coating layer peeled off. Depending on whether peeling occurred, the result was judged as ◎ if there was no peeling, ○ if there was almost no peeling, △ if some peeling occurred, and × if peeling occurred. Pencil hardness was measured by the pencil method in accordance with JIS K 5600-5-4 using a pencil scratch film hardness tester [CORETECH (MODEL: CT-PC2)], and impact resistance was evaluated at room temperature using a ball drop tester.

[0085] adhesion Pencil hardness Impact resistance Example 3 ○ 1H ○

[0086] As shown in Table 2 above, it was confirmed that the special surface coating layer according to the present invention has excellent adhesion, surface hardness, and strength.

Claims

Claim 1 It comprises a substrate layer; and a light-shielding layer formed on at least one surface of the substrate layer; wherein the light-shielding layer is formed from a composition for forming a light-shielding layer comprising 38-42 parts by weight of acrylic resin, 28-32 parts by weight of porous carbon, and 28-32 parts by weight of low refractive index nanoparticles, wherein the acrylic resin is an acrylic copolymer comprising 23-27 parts by weight of methyl acrylate monomer units, 23-27 parts by weight of 2-methoxyethyl acrylate monomer units, 23-27 parts by weight of 2-hydroxy-3-((4-methoxyphenyl)diazenyl)-5-methylbenzyl methacylate monomer units, and 23-27 parts by weight of 1H,1H,5H-octafluoropentyl 2-fluoroacrylate monomer units, and the porous carbon has an average particle size A black light-shielding member characterized by having a refractive index of 0.1-10 μm and the low refractive index nanoparticles being magnesium fluoride nanoparticles with an average particle size of 1-100 nm. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete

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