Interior sound proof curtain of building

Abstract

The present invention provides an indoor soundproof curtain for buildings comprising: first and second sheets made of flame-retardant polypropylene fibers; a fiber pad made of a meltblown fiber body formed between the first and second sheets and a flame-retardant powder attached to and captured by the meltblown fiber body; an electromagnetic shielding sheet attached to one side of the fiber pad; a soundproof sheet made of a thermoplastic elastomer (TPE) attached to the back side of the fiber pad; an adhesive sheet formed by coating both sides of the soundproof sheet to allow the fiber pad and the carbon fiber felt to be bonded together; and a carbon fiber felt formed by bonding a plurality of carbon fiber fabrics together by interlocking carbon fibers through needle punching, and bonding the carbon fibers to the soundproof sheet through the adhesive sheet.

Description

Technology Field

[0001] The present invention relates to an indoor soundproof curtain for buildings, and more specifically, to an indoor soundproof curtain that has excellent sound insulation and sound absorption properties to maintain a quiet and cozy indoor atmosphere, and has excellent light blocking and thermal insulation properties to enable comfortable living at an optimal indoor temperature. Background Technology

[0003] Recently, as the types of noise sources originating from both the exterior and interior of buildings have become increasingly diverse, noise pollution entering indoors is becoming serious, and legal regulations to control noise levels between floors and households in multi-unit dwellings such as apartments are being strengthened.

[0004] Furthermore, significant heat inflow and loss occur through windows; as window sizes increase, the amount of heat inflow and loss also increases. Although double-pane windows are installed to prevent this, their insulation capabilities remain limited. In particular, in subtropical and tropical regions, high outdoor temperatures and strong sunlight cause indoor temperatures to rise significantly, making indoor living uncomfortable and leading to a substantial increase in energy consumption as air conditioning is operated.

[0005] Furthermore, in recent building fire incidents both domestically and internationally, flames spread rapidly through interior materials such as curtains, and as these materials burn, smoke and toxic gases are generated, resulting in many casualties.

[0006] Regarding prior art related to curtains, Patent Document 1 discloses an aluminum multi-layer thermal insulation curtain used for sunshade or thermal insulation purposes, which is woven in a knitting or weaving method or in a weaving format using an aluminum strip having a certain width and a fiber yarn, and in which a thermal insulation layer for thermal insulation is additionally formed on the inner surface of the aluminum thermal insulation sheet.

[0007] However, the aforementioned patent document 1 has poor sound insulation and thermal insulation performance, and cannot provide non-combustibility, so it cannot prevent the spread of flames and the generation of toxic gases, making it vulnerable to fire, and it has the problem of not being able to block harmful electromagnetic waves generated from electronic equipment indoors and outdoors. Prior art literature

[0009] Republic of Korea Published Utility Model Publication No. 20-2011-0007237 (Published July 20, 2011) The problem to be solved

[0010] The purpose of the present invention is to provide an indoor soundproof curtain for buildings that is lightweight, does not burn or produce smoke due to excellent non-combustibility, allows for comfortable living at an optimal indoor temperature and increases the energy efficiency of the building due to excellent thermal insulation, provides excellent sound absorption and sound insulation performance to maintain a quiet and cozy indoor atmosphere, and also has electromagnetic wave shielding performance, prevents static electricity, has excellent stretchability so it easily restores itself without deformation, and has improved durability. means of solving the problem

[0012] A fiber pad comprising first and second sheets made of flame-retardant polypropylene fibers, a meltblown fiber body formed between the first and second sheets, and flame-retardant powder adhered to and captured by the meltblown fiber body; an electromagnetic shielding sheet formed attached to one side of the fiber pad; a soundproofing sheet made of a thermoplastic elastomer (TPE) bonded to the back side of the fiber pad; and an adhesive sheet formed by coating both sides of the soundproofing sheet to allow the fiber pad and carbon fiber felt to be bonded together. The invention includes a carbon fiber felt formed by bonding a plurality of carbon fiber fabrics together by interlocking carbon fibers through needle punching, and is adhesively bonded to a soundproofing sheet via an adhesive sheet; wherein the flame-retardant powder comprises attapulgite, sericite, and peppermint powder; the electromagnetic shielding sheet comprises a plurality of hollow tubes in which elongated holes are formed inside and metal membranes made of different metals are formed in multiple layers on the outer surface; wherein the hollow tubes are formed by sequentially forming metal membranes made of metal on polypropylene fibers and then applying heat to melt the polypropylene fibers so that elongated holes are formed inside; and the soundproofing sheet is bonded to the carbon fiber felt by applying a coating layer to the surface and then forming an adhesive sheet on the coating layer, wherein the soundproofing sheet comprises 50 to 70 weight% polyolefin resin, 20 to 40 weight% EPM rubber, 0.5 to 2 weight% carbonyl biscaprolactam, and 1 to 5 weight% tetrahydrofurfuryl methacrylate weight%, dipropylene glycol diacrylate 0.5 to 3 weight%, 1,6-hexanediol diacrylate 0.5 to 3 weight%, N,N'-m-phenylenedimaleimide 0.5 to 3 weight%, stannus chloride 0.5 to 1.5 weight%, p,p'-oxybisbenzenesulfonyl hydrazide 0.1 to 1.The present invention provides an indoor soundproof curtain for buildings comprising 0% by weight, wherein the coating layer comprises, per 100 parts by weight of silicone resin, 20 to 30 parts by weight of aluminum hydroxide, 20 to 30 parts by weight of butyl alcohol acrylate, 20 to 30 parts by weight of sodium silicate, 10 to 20 parts by weight of acetic acid, 10 to 20 parts by weight of sodium percarbonate, 10 to 20 parts by weight of 1,2-hexanediol, 10 to 20 parts by weight of methylenediphenyl diisocyanate, 10 to 20 parts by weight of tannic acid, 5 to 10 parts by weight of chlorinated paraffin, 1 to 5 parts by weight of carbonyl biscaprolactam, 1 to 5 parts by weight of xanthan gum, 1 to 5 parts by weight of tromethamine, and 0.5 to 2 parts by weight of a UV stabilizer. Effects of the invention

[0014] According to the present invention, it is lightweight, does not burn or produce smoke due to its excellent non-combustibility, allows for comfortable living at an optimal indoor temperature due to its excellent thermal insulation, increases the energy efficiency of the building, provides excellent sound absorption and sound insulation performance to maintain a quiet and cozy indoor atmosphere, and also has electromagnetic wave shielding performance, prevents static electricity, has excellent stretchability so it easily recovers without deformation, and has the effect of having excellent thermal insulation with improved durability. Brief explanation of the drawing

[0016] FIG. 1 is a diagram showing the usage state of an indoor soundproof curtain according to an embodiment of the present invention. FIG. 2a is a cross-sectional view of an indoor soundproof curtain according to an embodiment of the present invention, and FIG. 2b is an enlarged view of part A of FIG. 2a. Figure 3 is an enlarged view of part B of Figure 2a. FIG. 4 is a detailed drawing of a fiber pad according to an embodiment of the present invention. FIG. 5 is a drawing illustrating an example of an apparatus for manufacturing a meltblown fiber according to the present invention. FIG. 6a is a drawing illustrating an electromagnetic shielding sheet according to an embodiment of the present invention, and FIG. 6b is an electron microscope image of a hollow tube according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing linear grooves formed in an indoor soundproof curtain according to an embodiment of the present invention. FIGS. 8a to 8c are drawings illustrating the composition of carbon fiber felt. Specific details for implementing the invention

[0017] Hereinafter, with reference to the drawings, specific details for implementing an indoor soundproof curtain for a building according to the present invention will be explained in detail, focusing on embodiments.

[0018] Referring to FIGS. 1 to 3, the indoor soundproof curtain (1) according to the present invention is an indoor soundproof curtain that can maintain a quiet and cozy indoor atmosphere by having excellent sound insulation and sound absorption properties, and can lead a comfortable life at an optimal indoor temperature by having excellent light blocking and thermal insulation properties, and comprises all or part of a fiber pad (100), an electromagnetic shielding sheet (200), a soundproof sheet (300), an adhesive sheet (400), a carbon fiber felt (500), and an outer fabric member (600).

[0019] Referring to FIG. 4, the fiber pad (100) is composed of first and second sheets (31, 32) made of flame-retardant polypropylene fibers, a meltblown fiber body (33) formed between the first and second sheets (31, 32), and flame-retardant powder (34) captured in the meltblown fiber body (33).

[0020] The flame-retardant polypropylene fibers are flame-retardant treated polypropylene fibers that have almost no hygroscopicity to absorb and store moisture but have excellent breathability so that moisture can easily pass through, thereby allowing moisture to be delivered to other locations along the first sheet (31) or the second sheet (32), and additionally, moisture that has entered the interior through the first sheet (31) or the second sheet (32) can be absorbed by the meltblown fiber body (33), temporarily stored, and then discharged to be supplied to trees.

[0021] Referring to FIG. 5, the meltblown fiber body (33) is manufactured by the following method. First, a thermoplastic resin is fed into an extruder (2) along with an additive and mixed. At this time, the thermoplastic resin may be polyethylene, polypropylene, polyester, polyamide, polycarbonate, etc., and is melted and extruded by heat applied through a heat jacket, frictional heat, and pressure applied by screw rotation. Then, high-temperature and high-speed compressed air (6) is sprayed to collide with the fiber, causing it to be ejected into the atmosphere in a fine stream through an orifice (3) and the meltblown fiber is extruded in the direction of a collector (4). At this time, a flame-retardant powder (34) is supplied through a supply means (5) to the location where the meltblown fiber is extruded, and after blending is performed, it is continuously deposited in a horizontal direction on the collector (4) to form a composite meltblown fiber body (33). At this time, since the meltblown fibers that are emitted through the orifice (3) and fall to the collector (4) are hot but are rapidly cooled, it is preferable that the flame-retardant powder (34) be sprayed at a location where the flame-retardant powder (34) can adhere to the hot meltblown fibers.

[0022] In this way, the meltblown fiber (33) acts as a filter, so that the flame-retardant powder (34) is physically adhered and trapped inside, thereby increasing the flame retardancy of the curtain.

[0023] In addition, a fiber pad (100) is manufactured by laminating first and second sheets (31, 32) made of flame-retardant polypropylene fibers onto the upper and lower parts of the meltblown fiber body (34), respectively, and then passing them through a heating roller to compress them.

[0024] The flame-retardant powder (34) may include atapulgite, sericite, and peppermint powder.

[0025] The above attapulgite is a microcrystalline, tunnel structure formed by a chain structure of silica tetrahedral structures, and is a lightweight, porous ultrafine clay mineral that supports the fiber pad (100), provides flame retardancy, is composed of ultrafine particles and has excellent breathability, and is added in an amount of 35 to 55 weight%.

[0026] The above sericite is a mica mineral composed of very dense and fine particles that fills the gaps of the meltblown fiber body (33) to increase cohesion, has a small scale-like or leaf-like structure, and has antibacterial and deodorizing functions, and is added in an amount of 20 to 35 weight% for this purpose.

[0027] The above peppermint powder is made by pulverizing peppermint leaves and contains menthol as a main component. Menthol is insoluble in water, acts as a repellent for insects, has strong antibacterial properties, and is effective for preservation and deodorization, so 20 to 35 weight percent is added.

[0028] The above electromagnetic shielding sheet (200) is formed by attaching it to one side of the fiber pad (100).

[0029] Generally, electromagnetic waves are a phenomenon in which the vibration of an electromagnetic field propagates as a wave; that is, the periodic changes of the electric and magnetic fields become one and propagate as a wave, so the electric and magnetic fields exist simultaneously in conjunction with each other.

[0030] Referring to FIG. 6a, a foil layer (220) made of aluminum foil may be further formed between the fiber pad (100) and the electromagnetic shielding sheet (200), and the foil layer (220) reinforces the indoor soundproof curtain (1) and provides light blocking, thermal insulation, and electromagnetic shielding effects.

[0031] Referring to FIGS. 6a and 6b, the electromagnetic shielding sheet (200) includes a plurality of hollow tubes (210) in which a long hole (212) is formed inside and thin metal membranes (211) made of different conductive metals are formed in multiple layers on the outer surface.

[0032] The above hollow tube (210) is formed by sequentially coating different conductive metals onto polypropylene fibers having a fine diameter of 5 to 10 μm at a temperature range of 75 to 85°C for about 1 hour to form thin metal membranes (211) with a total thickness of 10 to 20 μm, and then applying heat of 500°C or higher in an inert atmosphere for 1 to 2 hours to selectively burn and remove only the polypropylene fibers, thereby forming an elongated hole (212) inside, and the hollow tube (210) coated with multiple layers having this shape is able to absorb electromagnetic waves.

[0033] The electromagnetic shielding sheet (200) comprises 20 to 30 weight% of EVA resin, 5 to 10 weight% of silicone resin, 50 to 60 weight% of dimethylformamide, 5 to 10 weight% of metal powder, 1 to 5 weight% of the hollow tube, 0.5 to 1.5 weight% of methyl methacrylate, and 0.5 to 1.5 weight% of acrylic emulsion resin.

[0034] EVA resin is a polymer obtained by copolymerizing ethylene and vinyl acetate monomer. It has excellent elasticity and flexibility and excellent durability, so it is not easily damaged by external impact. Due to these characteristics, 20 to 30 weight percent is added in the present invention.

[0035] The silicone resin is included in an amount of 5 to 10 weight percent, and has excellent coating power and water repellency for metal powder and hollow tubes, thereby blocking the metal components from coming into contact with external air and moisture, and has excellent heat resistance.

[0036] Dimethylformamide is added as a solvent in an amount of 50 to 60 weight percent.

[0037] The metal powder is composed of 5 to 10 weight percent of conductive metal powder particles, and the hollow tube (150) is composed of 1 to 5 weight percent and is evenly dispersed in the electromagnetic shielding sheet (200) to provide an electromagnetic shielding function.

[0038] Methyl methacrylate is added as a dispersant in an amount of 0.5 to 1.5 weight percent to separate the metal powders and hollow tubes so that they are evenly dispersed without aggregating.

[0039] The acrylic emulsion resin is included in an amount of 0.5 to 1.5 weight percent. During the manufacturing process of the electromagnetic shielding sheet (200) or during the salt spray test after manufacturing, there is a possibility that oxidation of the metal powder and hollow tube may occur. Therefore, if a small amount of acrylic emulsion resin is mixed into the electromagnetic shielding sheet (200), corrosion resistance and weather resistance are increased, and the oxidation of the metal component can be prevented.

[0040] In addition, it is necessary to prevent oxidation of the metal contained in the electromagnetic shielding sheet (200) during use of the indoor soundproof curtain (1) of the present invention. That is, since an oxide film may be formed and conductivity may be lost if the metal powder and hollow tube made of a conductive metal oxidize, it is preferable to additionally attach metal oxidation prevention sheets (250) to both sides of the electromagnetic shielding sheet (200).

[0041] To this end, the metal oxidation prevention sheet (250) may comprise 5 to 15 weight% of graphene oxide, 30 to 45 weight% of dimethylformamide, 40 to 55 weight% of tetrahydrofuran, 0.5 to 1.5 weight% of alkylbenzenesulfonate, and 0.5 to 1.5 weight% of butyl alcohol acrylate.

[0042] Graphite has a structure in which planes of carbon atoms arranged like a honeycomb-shaped hexagonal lattice are stacked in layers; a single layer of graphite is called graphene, and in this graphene, carbon atoms are each SP 2 It is a two-dimensional structure with a thickness of one atom connected by bonds, and carbon atoms have a hexagonal structure.

[0043] Graphene oxide is a plate-like carbon material produced by acid-treating graphite and has many functional groups. The oxidizing groups on the surface generated through the acid treatment process naturally form hydrogen bonds with H2O, and are produced in the form of a hydrate or a water-containing slurry.

[0044] The graphene oxide used in the present invention is obtained by preparing it in the form of a slurry and then removing moisture, and is contained in an amount of 5 to 15 weight percent. When such graphene oxide is applied, it functions to prevent oxidation of the metal. If the graphene oxide is less than 5 weight percent, the anti-oxidation effect is reduced and the coating is not uniform; if the graphene oxide exceeds 15 weight percent, the graphene oxides aggregate with each other, which may reduce the anti-oxidation effect caused by the coating. Since the method for manufacturing graphene oxide is already known, the manufacturing method will be omitted.

[0045] Dimethylformamide and tetrahydrofuran are used as solvents and are included together in amounts of 30 to 45 weight% and 40 to 55 weight%, respectively. These solvents do not easily degrade and increase the dispersion ability of graphene oxide. If the dimethylformamide is less than 30 weight%, the dispersion ability is reduced and the graphene oxides may aggregate with each other, and if the dimethylformamide exceeds 45 weight%, the concentration of graphene oxide decreases and the coating effect may be reduced.

[0046] Alkylbenzene sulfonate is added in an amount of 0.5 to 1.5 weight% to function as a stable emulsifier, increase dispersibility, and provide anti-corrosion properties. Butyl alcohol acrylate is added in an amount of 0.5 to 1.5 weight% to increase the dispersibility of graphene oxide.

[0047] The above soundproof sheet (300) is made of a thermoplastic elastomer (TPE; Thermo Plastic Elastomer), commonly called an elastomer, and is bonded to the back surface of the fiber pad (100), which is the opposite side of the attachment surface of the electromagnetic shielding sheet (200).

[0048] Thermoplastic elastomers (TPEs) possess the properties of both rubber and plastic; they are harder than rubber but softer than plastic, have excellent resilience, offer superior sound insulation, effectively absorb external shocks to reduce vibration, and increase adhesion to other materials.

[0049] To this end, the soundproof sheet (300) may comprise 50 to 70 weight% of polyolefin resin, 20 to 40 weight% of EPM rubber, 0.5 to 2 weight% of carbonyl biscaprolactam, 1 to 5 weight% of tetrahydrofurfuryl methacrylate, 0.5 to 3 weight% of dipropylene glycol diacrylate, 0.5 to 3 weight% of 1,6-hexanediol diacrylate, 0.5 to 3 weight% of N,N'-m-phenylenedimaleimide, 0.5 to 1.5 weight% of stannus chloride, and 0.1 to 1.0 weight% of p,p'-oxybisbenzenesulfonyl hydrazide.

[0050] The above polyolefin resin provides elasticity and improves rigidity and heat resistance, and when mixed with EPM rubber, the flowability of the elastomer is improved due to its low viscosity. As such a polyolefin resin, isotactic polypropylene, ethylene-propylene copolymer, etc., can be used. It is preferable that the polyolefin resin be included in an amount of 50 to 70 weight%; if it is less than 50 weight%, flowability and heat resistance may decrease, and if it exceeds 70 weight%, the elasticity and flexibility of the elastomer decrease, and impact strength may decrease.

[0051] EPM rubber is an ethylene-propylene copolymer rubber, and ethylene-propylene copolymer rubber, etc., can be used, and it is elastic and exhibits elasticity and flexibility. It is preferable that EPM rubber be included in an amount of 20 to 40 weight percent; if it is less than 20 weight percent, elasticity and flexibility may decrease, and if it exceeds 40 weight percent, heat resistance and flowability may decrease, causing the soundproof sheet to crack or become difficult to use.

[0052] Carbonyl biscaprolactam is added to improve heat resistance so that the thermoplastic elastic sheet (200) does not deteriorate from heat, and to increase resistance to heat that can be transferred through the carbon fiber felt (500) in the event of a fire. It is preferable that carbonyl biscaprolactam be included in an amount of 0.5 to 2 weight percent.

[0053] Tetrahydrofurfuryl methacrylate is added in an amount of 1 to 5 weight percent, which functions as a diluent and provides excellent adhesion.

[0054] Dipropylene glycol diacrylate and 1,6-hexanediol diacrylate are each included in an amount of 0.5 to 3 weight percent as crosslinking agents, which can strengthen mechanical properties by interconnecting molecular sieves to form a polymer and increasing the crosslinking density.

[0055] N,N'-m-phenylenedimaleimide is included as a crosslinking agent in an amount of 0.5 to 3 weight%, and because it has high reactivity, it enables a rapid crosslinking reaction to occur.

[0056] Stannerous chloride is included in an amount of 0.5 to 1.5 weight%, which increases the chemical reaction rate and promotes crosslinking to activate crosslinking.

[0057] p,p'-oxybisbenzenesulfonyl hydrazide is included in an amount of 0.1 to 1.0 weight% and functions as a foaming agent.

[0058] In addition, the soundproof sheet (300) has a coating layer (310) containing red clay powder and black charcoal powder applied to its surface, and then an adhesive sheet (400) is formed on top of it to be combined with a carbon fiber felt (500).

[0059] The coating layer (310) may comprise, per 100 parts by weight of silicone resin, 20 to 30 parts by weight of aluminum hydroxide, 20 to 30 parts by weight of butyl alcohol acrylate, 20 to 30 parts by weight of sodium silicate, 10 to 20 parts by weight of acetic acid, 10 to 20 parts by weight of sodium percarbonate, 10 to 20 parts by weight of 1,2-hexanediol, 10 to 20 parts by weight of methylenediphenyl diisocyanate, 10 to 20 parts by weight of tannic acid, 5 to 10 parts by weight of chlorinated paraffin, 1 to 5 parts by weight of carbonyl biscaprolactam, 1 to 5 parts by weight of xanthan gum, 1 to 5 parts by weight of tromethamine, and 0.5 to 2 parts by weight of ultraviolet stabilizer.

[0060] The above silicone resin is elastic and exhibits elasticity and flexibility, preventing cracking of the coating layer; it has excellent adhesion and excellent heat resistance, moisture resistance, light resistance, and weather resistance, thereby improving the preservation of the coating layer.

[0061] The above aluminum hydroxide is an aluminum hydroxide added as an inorganic flame retardant. It is inexpensive and has the characteristic of not volatilizing due to heat, so it generates non-combustible gas after decomposition to block oxygen access and dilute flammable gas. To this end, 20 to 30 parts by weight are added per 100 parts by weight of silicone resin.

[0062] The above butyl alcohol acrylate controls the viscosity of the composition, emulsifies the properties of the composition, increases adhesion and bonding strength, reduces differences due to shrinkage and expansion caused by external temperature differences, and forms a film to prevent corrosion caused by external factors; for this purpose, 20 to 30 parts by weight are added per 100 parts by weight of silicone resin.

[0063] The above sodium silicate is added in an amount of 20 to 30 parts by weight per 100 parts by weight of silicone resin to increase the surface strength of the coating layer and increase flame retardancy, chemical resistance, and corrosion resistance.

[0064] The above acetic acid is a carboxylic acid having antibacterial and antifungal properties, which can kill pathogens by inhibiting their carbohydrate metabolism, and is added in an amount of 10 to 20 parts by weight per 100 parts by weight of silicone resin.

[0065] The above sodium percarbonate is used as a detergent or bleach, can remove mold or bacteria, and is added in an amount of 10 to 20 parts by weight per 100 parts by weight of silicone resin.

[0066] The above 1,2-hexanediol may be included in an amount of 10 to 20 parts by weight per 100 parts by weight of silicone resin, and has strong antibacterial properties and acts as a preservative so that the components included in the composition are preserved and can perform their functions.

[0067] The above methylene diphenyl diisocyanate is an aromatic diisocyanate chemical substance with excellent thermal insulation properties that prevent heat conduction, thereby preventing deformation due to external temperature changes and increasing durability. It is included in an amount of 10 to 20 parts by weight per 100 parts by weight of silicone resin, and if the amount exceeds 20 parts by weight, dispersibility and flowability may be reduced.

[0068] The above tannic acid is a powder composed of calotannin, which has antibacterial and antioxidant properties and can prevent insects and harmful bacteria from approaching, and 10 to 20 parts by weight are added per 100 parts by weight of silicone resin.

[0069] The above-mentioned chlorinated paraffin is an organic flame retardant that minimizes combustion by replacing radicals, which are generated during the combustion process and cause a continuous exothermic reaction, with chlorine, which has low activity. To this end, 5 to 10 parts by weight are added per 100 parts by weight of silicone resin, provided that it is preferable to add 10 parts by weight or less due to environmental issues caused by chlorine emissions.

[0070] The above carbonyl biscaprolactam is added to improve heat resistance, to resist high temperatures, and to increase resistance to sunlight; it is preferably included in an amount of 1 to 5 parts by weight per 100 parts by weight of silicone resin.

[0071] The above xanthan gum has excellent heat resistance, a wide pH range, increases adhesiveness and viscosity, and exerts binding force between the components constituting the composition to prevent separation due to differences in specific gravity, and for this purpose, 1 to 5 parts by weight may be added per 100 parts by weight of silicone resin.

[0072] The above tromethamine may be included in an amount of 1 to 5 parts by weight per 100 parts by weight of silicone resin, and is a basic organic compound that has excellent pH buffering ability, increases fluidity, and can prevent oxidation of the composition.

[0073] The above UV stabilizer is added to block and absorb ultraviolet rays to prevent the coating layer from decomposing, discoloring, or being damaged by ultraviolet rays, and may be added in an amount of 0.5 to 2 parts by weight per 100 parts by weight of silicone resin.

[0074] The adhesive sheet (400) is applied to both sides of the soundproof sheet (300) so that the fiber pad (100) and the carbon fiber felt (500) are bonded together.

[0075] The adhesive sheet (400) may be formed by mixing a silicate mixture, 5 to 10 parts by weight of mineral fiber and 5 to 10 parts by weight of curing agent per 100 parts by weight of silicate mixture.

[0076] At this time, the silicate mixture may consist of 30 to 40 weight% sodium silicate, 20 to 30 weight% potassium silicate, 20 to 30 weight% lithium silicate, 5 to 10 weight% colloidal silica, and 1 to 5 weight% ion-exchanged water.

[0077] Sodium silicate, potassium silicate, and lithium silicate, which serve as the basic liquid acceptors for the silicate mixture, are non-toxic and non-flammable in an aqueous solution and are included in the adhesive sheet (400) to form an inorganic bond that is firmly and tightly adhered to the loess powder of the coating layer (310).

[0078] In addition, mineral fibers are included in an amount of 5 to 10 parts by weight per 100 parts by weight of silicate mixture, which prevents cracking of the adhesive layer during the drying and curing process, ensures thickening and flexibility, and provides a predetermined strength.

[0079] The above fiber pad (100), the electromagnetic shielding sheet (200) coupled to one side of the fiber pad, and the soundproof sheet (300) coupled with an adhesive sheet (400) interposed on the back side of the fiber pad (100) can be partially bonded by applying heat from both sides, and a carbon fiber felt (500) can be bonded by interposing an adhesive sheet (400) on the soundproof sheet (300).

[0080] Referring to Fig. 7, when joined in this way, a plurality of linear grooves (L) spaced apart from each other along the vertical direction are formed, thereby making it easy to unfold or fold the indoor soundproof curtain (1) connected to the curtain frame by a hook as in Fig. 1.

[0081] The carbon fiber felt (500) is bonded to the soundproof sheet (300) through an adhesive sheet (400), and a plurality of carbon fiber fabrics (510) are bonded together by interlocking carbon fibers through needle punching.

[0082] Carbon fiber is produced by processing carbon material into a fibrous form. It has a fibrous structure with a carbon content of over 90% and exhibits excellent properties, particularly at high temperatures. Unlike metals, whose mechanical strength decreases with increasing temperature, carbon fiber has the characteristic of increasing mechanical strength as the temperature rises. It is considered the only material capable of being used up to 3,000°C in a non-oxidizing atmosphere due to its low coefficient of thermal expansion. Depending on the raw material, carbon fiber is classified into PAN-based carbon fiber, rayon-based carbon fiber, and pitch-based carbon fiber.

[0083] Carbon fibers with a diameter of 5 to 15 μm, composed mostly of carbon, are produced by heat-treating a carbon material called a precursor at a carbonization temperature of 800 to 1,500°C through the thermal decomposition of organic matter. These carbon fibers are then subjected to processes such as fiber opening and carding to manufacture a carbon fiber fabric (510). Here, the carbon fiber fabric (510) refers to a sheet-like carbon fiber material that is not entangled by needle punching. It is preferable that this carbon fiber fabric (510) contains, either wholly or partially, ultra-high modulus (UHM) carbon fibers with a tensile modulus of 600 GPa or higher. In the carbon fiber fabric (510), carbon fibers exist in a form in which they are irregularly entangled with each other.

[0084] Next, referring to FIGS. 8a to 8c, carbon fiber fabrics (510) are laminated as needed, and carbon fibers are interlocked by needle punching to bind multiple carbon fiber fabrics (510) together, thereby manufacturing a carbon fiber felt (500). That is, carbon fibers penetrate in the thickness direction of the carbon fiber fabrics (510) by needle punching, and the carbon fiber fabrics (510) are fixed by interfacial bonding in a laminated state. Among the laminated carbon fiber fabrics (510), some carbon fibers constituting the upper carbon fiber fabric (511) and the lower carbon fiber fabric (512), located at the top and bottom respectively, are interlocked with the intermediate carbon fiber fabric (513) located between them by moving down or up by needle punching.

[0085] However, if carbon fibers penetrate vertically with respect to the surface of the carbon fiber felt (500), the carbon fibers penetrating vertically may act as a heat transfer path and reduce non-flammability; therefore, it is preferable that the carbon fibers penetrating vertically penetrate diagonally at an angle of 15 to 30° with respect to the surface of the carbon fiber felt (500). This extends the heat transfer path and reduces the amount of heat dissipation. If the angle exceeds 30°, the effect of reducing the amount of heat dissipation may decrease, and if the angle is less than 15°, needle punching work becomes difficult and the fixing force between the fabrics may decrease.

[0086] And, the carbon fiber fabric (510) is formed by mixing carbon fibers and polypropylene fibers, and then heat-treating the mixed fibers at a temperature of 500°C or higher, so that only the polypropylene fibers entangled with the carbon fibers are selectively burned and removed, and multiple gaps are formed between the carbon fibers. An air layer is formed along these gaps, thereby providing stretchability and thermal insulation.

[0087] At this time, it is preferable to mix 5 to 10 parts by weight (excluding 10 parts by weight) of polypropylene fiber per 100 parts by weight of carbon fiber. If less than 5 parts by weight of polypropylene fiber is mixed, the gaps between the carbon fibers are insufficient, so the stretchability and thermal insulation properties are reduced, and if more than 10 parts by weight of polypropylene fiber are mixed, the density of the carbon fibers decreases, which may reduce the flame resistance.

[0088] Here, since a number of gaps may be formed in all carbon fiber fabrics (510) constituting the carbon fiber felt (500), the non-flammability may be reduced or the fixing force between the fabrics may be reduced, it is preferable to form gaps only in a single or multiple intermediate carbon fiber fabrics (513) interposed between the upper carbon fiber fabric (511) and the lower carbon fiber fabric (512) located at the top and bottom of the carbon fiber felt (500).

[0089] The carbon fiber felt (500) can be installed with its outer surface exposed to the interior of the building, and since it has a soft external texture, it is not necessary to separately combine and use an outer fabric member (600).

[0090] The outer fabric member (600) may be made of natural fibers or synthetic fibers that are joined to the fiber pad (100) and carbon fiber felt (500) by sewing or punching to wrap the outside of the indoor soundproof curtain.

[0091] Ultimately, the indoor soundproof curtain (1) for buildings according to the present invention is lightweight, does not burn or produce smoke due to its excellent non-combustibility, allows for comfortable living at an optimal indoor temperature due to its excellent thermal insulation, increases the energy efficiency of the building, provides excellent sound absorption and sound insulation performance to maintain a quiet and cozy indoor atmosphere, has electromagnetic wave blocking performance, prevents static electricity, has excellent stretchability so it is easily restored and does not deform easily, and has improved durability.

[0092] The above embodiments in the present invention are merely examples, and the present invention is not limited thereto. Anything having a configuration substantially identical to the technical concept described in the claims of the present invention and achieving the same functional effect is included within the technical scope of the present invention. Explanation of the symbols

[0094] 1. Indoor soundproof curtains 100. Fiber pad 31. Sheet 1 32. Second sheet 33. Meltblown fiber 34. Flame-retardant powder 200. Electromagnetic shielding sheet 210. Hollow tube 211. Metal membrane 212. Janghol 220. Foil layer 250. Metal Antioxidant Sheet 300. Soundproofing sheet 310. Coating layer 400. Adhesive sheet 500. Carbon fiber felt 510. Carbon fiber fabric 511. Upper carbon fiber fabric 512. Lower carbon fiber fabric 513. Intermediate carbon fiber fabric 520. Carbon fiber 600. Outer fabric member L. Groove P. Needle punching machine N. Needles

Claims

Claim 1 A fiber pad comprising first and second sheets made of flame-retardant polypropylene fibers, a meltblown fiber body formed between the first and second sheets, and flame-retardant powder adhered to and captured by the meltblown fiber body; an electromagnetic shielding sheet attached to one side of the fiber pad; a soundproofing sheet made of a thermoplastic elastomer (TPE) bonded to the back side of the fiber pad; and an adhesive sheet formed by coating both sides of the soundproofing sheet to allow the fiber pad and carbon fiber felt to be bonded together. The invention includes a carbon fiber felt formed by bonding a plurality of carbon fiber fabrics together by interlocking carbon fibers through needle punching, and is adhesively bonded to a soundproofing sheet via an adhesive sheet; wherein the flame-retardant powder comprises attapulgite, sericite, and peppermint powder; the electromagnetic shielding sheet comprises a plurality of hollow tubes in which elongated holes are formed inside and metal membranes made of different metals are formed in multiple layers on the outer surface; wherein the hollow tubes are formed by sequentially forming metal membranes made of metal on polypropylene fibers and then applying heat to melt the polypropylene fibers so that elongated holes are formed inside; and the soundproofing sheet is bonded to the carbon fiber felt by applying a coating layer to the surface and then forming an adhesive sheet on the coating layer, wherein the soundproofing sheet comprises 50 to 70 weight% polyolefin resin, 20 to 40 weight% EPM rubber, 0.5 to 2 weight% carbonyl biscaprolactam, and 1 to 5 weight% tetrahydrofurfuryl methacrylate weight%, dipropylene glycol diacrylate 0.5 to 3 weight%, 1,6-hexanediol diacrylate 0.5 to 3 weight%, N,N'-m-phenylenedimaleimide 0.5 to 3 weight%, stannus chloride 0.5 to 1.5 weight%, p,p'-oxybisbenzenesulfonyl hydrazide 0.1 to 1.An indoor soundproof curtain for buildings comprising 0% by weight, wherein the coating layer comprises, per 100 parts by weight of silicone resin, 20 to 30 parts by weight of aluminum hydroxide, 20 to 30 parts by weight of butyl alcohol acrylate, 20 to 30 parts by weight of sodium silicate, 10 to 20 parts by weight of acetic acid, 10 to 20 parts by weight of sodium percarbonate, 10 to 20 parts by weight of 1,2-hexanediol, 10 to 20 parts by weight of methylenediphenyl diisocyanate, 10 to 20 parts by weight of tannic acid, 5 to 10 parts by weight of chlorinated paraffin, 1 to 5 parts by weight of carbonyl biscaprolactam, 1 to 5 parts by weight of xanthan gum, 1 to 5 parts by weight of tromethamine, and 0.5 to 2 parts by weight of a UV stabilizer. Claim 2 In claim 1, a metal oxidation prevention sheet for preventing metal oxidation is attached and formed on both sides of the electromagnetic shielding sheet, and the metal oxidation prevention sheet comprises 5 to 15 weight% graphene oxide, 30 to 45 weight% dimethylformamide, 40 to 55 weight% tetrahydrofuran, 0.5 to 1.5 weight% alkylbenzenesulfonate, and 0.5 to 1.5 weight% butyl alcohol acrylate; and the adhesive sheet is formed by mixing a silicate mixture with 5 to 10 weight parts mineral fiber and 5 to 10 weight parts curing agent per 100 weight parts silicate mixture, and the silicate mixture comprises 30 to 40 weight% sodium silicate, 20 to 30 weight% potassium silicate, 20 to 30 weight% lithium silicate, 5 to 10 weight% colloidal silica, and 1 to An indoor soundproof curtain for buildings, comprising 5 weight percent, wherein the carbon fiber fabric interposed between the upper and lower carbon fiber fabrics constituting the carbon fiber felt is characterized by forming gaps between the carbon fibers as the polypropylene fibers are removed by mixing carbon fibers and polypropylene fibers and then heat-treating.

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