Integrated Moisture Control Module with Insert-Molded Breathable Film

Abstract

The present invention relates to an integrated moisture control module in which a breathable film is combined in an insert manner. Specifically, the invention aims to provide an integrated moisture control module comprising: a housing having an internal space and an open top; a desiccant installed inside the housing; a perforated bracket fixed to the open top of the housing; and a breathable film embedded in the perforated bracket in an insert manner.

Description

Technology Field

[0001] The present invention relates to an integrated moisture control module in which a breathable film is combined in an insert manner. Background Technology

[0002] Automotive lamps suffer from the problem of condensation forming inside during rain or in high-humidity environments. Condensation is the phenomenon where fine water droplets form on the surface of the lamp lens, which can lead not only to a decrease in light distribution performance but also to damage to mounted electronic devices.

[0003] In particular, condensation can significantly impede the safe operation of vehicles, increase consumer dissatisfaction, and lead to industrial losses such as lamp replacements. This condensation phenomenon occurs due to the difference between external humidity and internal temperature, specifically when internal moisture particles condense as the temperature of the lamp lens drops.

[0004] Existing products containing desiccants within dust covers have failed to simultaneously address the durability issues of the breathable film and the maintenance of the desiccant's performance. Since most products were designed with the breathable film in direct contact with the desiccant, problems arose where the film's durability deteriorated when the desiccant became wet, as it was affected by excessive moisture. Furthermore, the accumulation of excessive moisture within the desiccant could lead to issues such as performance degradation or damage to the film. The problem to be solved

[0005] The present invention aims to provide a technology that can ensure the durability of the breathable film while optimizing the performance of the absorbent by innovatively improving the method of combining the absorbent and the breathable film.

[0006] In addition, the present invention aims to solve the problem of a moisture-absorbing agent coming into contact with the entire surface area of ​​a breathable film, thereby lowering the overall durability of the breathable film. means of solving the problem

[0007] The present invention provides an integrated moisture control module comprising: a housing having a space formed inside and an open top; a desiccant installed inside the housing; a perforated bracket fixed to the open top of the housing; and a breathable film embedded in the perforated bracket in an insert manner.

[0008] According to one embodiment of the present invention, the perforated bracket may include a perforation ratio of 1 to 50%.

[0009] According to one embodiment of the present invention, the perforated bracket may be fixed to the open upper part of the housing by rotational welding.

[0010] According to one embodiment of the present invention, the perforated bracket may be manufactured by injection molding.

[0011] According to one embodiment of the present invention, the perforated bracket may be disc-shaped.

[0012] According to one embodiment of the present invention, the breathable film may comprise a polyester nonwoven fabric layer, a polyolefin breathable layer, and a polyolefin-based perforated film layer laminated thereon.

[0013] According to one embodiment of the present invention, each layer of the breathable film may be bonded with a polyurethane-based adhesive.

[0014] The gully transmittance of the above-mentioned breathable film is 100 to 3,000 sec, and the moisture permeability of the above-mentioned breathable film is 500 to 6,000 g / m² 2 · May include 24 hours.

[0015] According to one aspect of the present invention, the polyolefin-based perforated film has 1 to 500 holes / cm 2 It may include a polyolefin-based perforated film having perforations formed therein.

[0016] According to one embodiment of the present invention, the hygroscopic agent may include a solidifying hygroscopic agent, a gel-type hygroscopic agent, or a mixture thereof.

[0017] According to one aspect of the present invention, the solidifying hygroscopic agent may comprise at least one or more hygroscopic materials selected from the group consisting of magnesium chloride, calcium chloride, and sodium carbonate; a hardenable inorganic material comprising at least one selected from the group consisting of magnesium oxide and calcium oxide; and an alkali metal phosphate.

[0018] According to one embodiment of the present invention, the gel-type hygroscopic agent may comprise at least one hygroscopic material selected from the group consisting of magnesium chloride and sodium carbonate; and one or more hygroscopic copolymers selected from polyacrylate and polyacrylate metal salts. Effects of the invention

[0019] In the present invention, the breathable film is designed to be inserted into a perforated bracket so that the desiccant does not come into direct contact with a large surface area of ​​the breathable film, thereby preventing a decrease in the durability of the breathable film.

[0020] In addition, the present invention can maximize the performance of the desiccant by optimizing air circulation using a perforated bracket. Brief explanation of the drawing

[0021] FIG. 1 is a schematic diagram of the exterior of an integrated moisture control module according to the present invention. FIG. 2 is an exploded schematic diagram of an integrated moisture control module according to the present invention. FIG. 3 is a schematic diagram of a first perforated bracket according to the present invention. FIG. 4 is a schematic diagram of a second through-hole bracket according to the present invention. FIG. 5 is a schematic diagram of a perforated bracket with a breathable film inserted according to the present invention. FIG. 6 is an exploded schematic diagram of a perforated bracket with a breathable film inserted according to the present invention. FIG. 7 is a schematic diagram of the actual appearance of the first perforated bracket according to the present invention. Specific details for implementing the invention

[0022] The present invention will be described in more detail below through specific examples or embodiments, including the attached drawings. However, the following specific examples or embodiments are merely references for the detailed description of the present invention and the present invention is not limited thereto and may be implemented in various forms.

[0023] Furthermore, unless otherwise defined, all technical and scientific terms have the same meaning as generally understood by one of the art to which the present invention pertains. The terms used in the description of the present invention are merely for the purpose of effectively describing specific embodiments and are not intended to limit the present invention.

[0024] Additionally, the singular form used in the specification and the appended claims may be intended to include the plural form unless specifically indicated otherwise in the context.

[0025] Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0026] The present invention provides an integrated moisture control module (100) comprising: a housing (10) having a space formed inside and an open top; a desiccant installed inside the housing (10); a perforated bracket (20) fixed to the open top of the housing; and a breathable film (23) embedded in the perforated bracket in an insert manner.

[0027] Specifically, the present invention includes a perforated bracket structure with a breathable film inserted therein, thereby enabling the desiccant to efficiently absorb moisture without becoming excessively wet and resolving the durability issues of the breathable film. Furthermore, the structure is designed to function stably even in environments with high vibration, such as automobiles, thereby preventing the film from breaking or being damaged and maintaining the performance of the desiccant over the long term. The structure can simultaneously address the efficient maintenance of the desiccant's performance and durability issues associated with long-term use, and can overcome the disadvantages of existing desiccant products.

[0028] The perforated bracket structure (20) with the above-mentioned breathable film inserted is described in FIG. 5, but is not limited to only the above structure.

[0029] FIG. 6 is a schematic diagram showing the disassembled structure of the perforated bracket (20) with the breathable film inserted in FIG. 5 in order to specifically explain the structure of the perforated bracket (20) with the breathable film inserted therein.

[0030] A breathable film (23) is inserted between the first perforated bracket (21) and the second perforated bracket (22) in FIG. 5 above, thereby forming a perforated bracket structure with a breathable film inserted in the form of FIG. 6.

[0031] The perforated bracket (20) into which the above-mentioned breathable film (23) is inserted has the breathable film (23) inserted inside, thereby reducing the surface area where the absorbent that subsequently absorbs an excessive amount of moisture comes into contact with the inside of the breathable film and maintaining the durability of the breathable film.

[0032] The perforated bracket with the above-mentioned breathable film inserted may be manufactured by an injection molding method, but is not limited thereto as long as there is a method capable of creating the above-mentioned structure.

[0033] According to one embodiment of the present invention, the through-hole bracket may have a through-hole ratio of at least 1%, at least 2%, at least 3%, at least 4%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, at least 10% as a lower limit, and at least 50%, at least 40%, at least 30%, at least 20%, at least 15%, at least 12% as an upper limit, preferably 1 to 50%, preferably 5 to 20%, preferably 7 to 15%, and preferably 9 to 12%, but is not limited thereto.

[0034] By satisfying the above perforation ratio, the airflow and moisture control capabilities of the breathable film can be optimized, and the performance of the desiccant can be maintained more effectively.

[0035] In addition, the above perforation ratio maintains an appropriate balance between the breathable film and the desiccant, thereby preventing durability issues that may occur during long-term use and ensuring stable performance even in vibrating environments such as automobiles, but is not limited thereto.

[0036] In addition, the size of the holes in the above-mentioned bracket may have an average diameter of 1 to 5 mm, but is not limited thereto. By satisfying the above-mentioned hole size and hole ratio, the breathable film has the advantage of not getting wet as much as possible while simultaneously having excellent moisture absorption.

[0037] In addition, according to one embodiment of the present invention, the ratio of through holes and the size of through holes on the upper and lower surfaces of the through-hole bracket may be different.

[0038] The through-hole ratio of the upper surface of the above-mentioned through-hole bracket may be lower than the through-hole ratio of the lower surface.

[0039] In addition, the size of the through hole may be the same for the upper surface and the lower surface, or the through hole on the lower surface may be slightly larger. For example, the size of the through hole on the lower surface may be 1 to 10%, preferably 2 to 8%, preferably 3 to 7%, or preferably 4 to 6% larger than the size of the through hole on the upper surface, but is not limited thereto.

[0040] According to one embodiment of the present invention, the perforated bracket may be fixed to the open upper part of the housing by rotational welding.

[0041] By fixing using the above rotary welding method, the connection between the bracket and the housing is made robust and stable, and assembly becomes easy. In addition, the rotary welding method prevents detachment due to vibration or external impact, thereby increasing the durability and reliability of the product.

[0042] The above rotary fusion temperature may be 150 to 250 ℃, preferably 180 to 220 ℃, but is not limited thereto.

[0043] According to one embodiment of the present invention, the perforated bracket may be manufactured by injection molding.

[0044] The material of the above-mentioned perforated bracket may include a polyolefin resin, and the polyolefin resin may include one or more selected from polyethylene resin, polypropylene resin, polyethylene copolymer resin, polypropylene copolymer resin, and polyethylene-propylene copolymer resin, but is not limited thereto.

[0045] The above polyolefin resin may have a melt index (230 ℃ / 2.16 kg) according to ASTM D 1238 of 1 g / 10 min or more, 3 g / 10 min or more, 5 g / 10 min or more, 8 g / 10 min or more, 10 g / 10 min or more, 11 g / 10 min or more, and may have a melt index of 20 g / 10 min or less, 19 g / 10 min or less, 18 g / 10 min or less, 17 g / 10 min or less, 16 g / 10 min or less, 15 g / 10 min or less, 14 g / 10 min or less, 13 g / 10 min or less, preferably 1 to 20 g / 10 min, and preferably 11 to 13 g / 10 min, but is not limited thereto.

[0046] The material of the above-mentioned perforated bracket may further include an inorganic filler in a polyolefin resin.

[0047] The above inorganic filler may include one or more selected from calcium carbonate, talc, silica, kaolin, magnesite, magnesium oxide, aluminum oxide, mica, borate, borosilicate, titanium oxide, barium sulfate, silicate, graphite, diatomaceous earth, asbestos, glass fiber, aluminum nitride, boron nitride, silicon carbide, and tungsten carbide, but is not limited thereto.

[0048] The material of the above-mentioned perforated bracket may comprise 1 to 50 parts by weight, preferably 1 to 30 parts by weight, per 100 parts by weight of polyolefin resin, but is not limited thereto.

[0049] According to one embodiment of the present invention, the perforated bracket may be disc-shaped, but the shape is manufactured to fit the shape of the opening of the housing and is not limited thereto.

[0050] The above breathable film may be formed from a material having a predetermined value for moisture permeability, which indicates the degree to which water vapor in the air permeates the breathable film, and water pressure resistance, which is the pressure at which water or liquid can permeate the breathable film.

[0051] For example, the above breathable film has a moisture permeability of 500 to 6,000 g / m² 2 It is / h, and the water pressure resistance can be 1 to 30 cmH2O / min, and preferably the water vapor permeability is 1,000 to 5,000 g / m² 2 It is / h, and the water pressure resistance can be 5 to 25 cmH2O / min, and preferably the water vapor permeability is 2,000 to 4,000 g / m² 2 It can be formed from a material that has a water vapor per hour and a water pressure resistance of 10 to 20 cmH2O / min. In this case, the water vapor permeability is a value measured by KS K 0594 (calcium chloride method), and the water pressure resistance is a value measured by ISO 811-1981.

[0052] By forming the breathable film with a material having a moisture permeability within this range, the rate at which the desiccant absorbs moisture is controlled, thereby increasing the lifespan of the integrated moisture control module. Additionally, by forming the breathable film with a material having water pressure resistance within this range, it is possible to effectively prevent liquids, such as water formed inside the integrated moisture control module, from penetrating the breathable film and entering the interior of the vehicle lamp.

[0053] In addition, the breathable film can be formed from a material having a tensile strength and a permeability value indicating the degree to which air permeates the breathable film.

[0054] For example, the breathable film may be formed from a material having an air permeability of 500 to 700 ml / min, a tensile strength of MD 1 to 10 kgf / mm² and CD 1 to 5 kgf / mm², preferably with an air permeability of 450 to 650 ml / min, a tensile strength of MD 3 to 6 kgf / mm² and CD 1.2 to 3 kgf / mm², and preferably with an air permeability of 400 to 600 ml / min, a tensile strength of MD 3.5 to 4 kgf / mm² and CD 1.5 to 2 kgf / mm². In this case, the air permeability is a value measured by ISO 5636-3 and the tensile strength is a value measured by MS210-08 that satisfies both MD (Machine Direction) and CD (Cross Direction).

[0055] By forming the breathable film from a material having air permeability within this range, more air permeates through the film, allowing the desiccant to absorb more moisture contained in the air. Additionally, by forming the breathable film from a material having tensile strength within this range, it possesses high durability to prevent tearing, enabling long-term use.

[0056] When a breathable film is formed from a material having moisture permeability, water pressure resistance, air permeability, and tensile strength within the range described above, the material is not limited, but can be formed from materials such as polymer resin, fabric, and paper, and preferably can be a polymer resin, and specific examples may be one or more selected from polymer resins such as high-density polyethylene (HDPE), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET), but is not necessarily limited thereto.

[0057] In another embodiment, the above-mentioned breathable film may be a laminated breathable film comprising a polyester nonwoven fabric layer, a polyolefin porous film layer, and a polyolefin-based perforated film layer. The laminated breathable film can effectively control the moisture absorption rate of the manufactured moisture-absorbing product, and in particular, has the advantage of simplifying the process and reducing additional costs by enabling heat sealing without the need for an additional polymer resin coating.

[0058] Furthermore, by using a polyurethane-based adhesive between the polyester nonwoven fabric layer and the polyolefin porous film layer, a stronger bond can be achieved compared to conventional heat bonding using hot melt adhesives or epoxy adhesives. In addition, the polyurethane-based adhesive has excellent water resistance, and when bonded between the polyester nonwoven fabric layer and the polyolefin porous film layer, it offers the advantage of excellent breathability.

[0059] In addition, as the polyolefin porous film layer and the polyolefin-based perforated film layer are fixed by a polyurethane-based adhesive, the three-layer laminated film has excellent breathability, as well as excellent durability and moisture permeability.

[0060] According to one embodiment of the present invention, the air permeability (150 ml air volume) of the laminated breathable film is 500 to 1,500 seconds, and the moisture permeability is 500 to 2,500 g / m² 2 It may be / day, and specifically, the air permeability (150ml air volume) of the laminated breathable film is 500 to 1,000 seconds, and the moisture permeability is 500 to 1,500 g / m² 2 It may be / day, and specifically, the Gulli permeability of the laminated breathable film is 600 to 800 seconds and the moisture permeability is 1,500 to 2,000 g / m² 2 It could be / day.

[0061] The above polyester nonwoven fabric layer may include a polyester-based nonwoven fabric.

[0062] The above polyester nonwoven fabric may be woven from a single polyester fiber or a blend of natural fibers or synthetic fibers with polyester fibers, but is not limited thereto. The above natural fibers may be cotton, wool, silk, hemp, etc., and the above synthetic fibers may be synthetic fibers such as polyamide fibers, polyester fibers, etc., but are not limited thereto.

[0063] In addition, the polyester nonwoven fabric may be manufactured by methods such as needle punching, thermal bonding, spun bonding, melt blowing, or spun lacing, but is not limited thereto.

[0064] In addition, the polyester-based nonwoven fabric has a basis weight of 10 to 60 g / m² 2 It may be, specifically, 15 to 50 g / m² 2 It may be, specifically, 20 to 40 g / m² 2 It may be, but is not limited to this.

[0065] The material of the above-mentioned polyolefin porous film layer may be one or more selected from polyethylene, polypropylene, and polybutylene, and the polyethylene may be one or more selected from low-density polyethylene, high-density polyethylene, and linear low-density polyethylene, but is not limited thereto. In addition, the above-mentioned polyolefin porous film may be manufactured by including an inorganic filler in the above-mentioned polyolefin resin. The above-mentioned polyolefin porous film may be manufactured by adding an inorganic filler to a polyolefin resin to produce an extruded sheet and then stretching it, but is not limited to the above-mentioned manufacturing method.

[0066] The above inorganic filler may be one or more selected from the group consisting of calcium carbonate, talc, clay, kaolin, silica, and diatomaceous earth. The average particle size of the above inorganic filler may be selected according to the purpose of the invention and is not limited for moisture permeability, breathability, and mechanical strength, but preferably may be 0.5 to 30 μm, but is not limited thereto. The content of the above inorganic filler may be 20 to 40 parts by weight per 100 parts by weight of the above polyethylene resin to improve flexural strength, elasticity, and flexibility, but is not limited thereto.

[0067] In addition, according to one aspect of the present invention, the polyolefin-based perforated film comprises 1 to 500 holes / cm in a polyolefin-based film. 2 It may be a film having perforations formed therein, specifically 8 to 30 percm 2 It may be a film having perforations formed therein, specifically 8 to 10 percm 2 It may be a film with perforations formed therein, but is not limited thereto.

[0068] As the number of perforations in the above polyolefin-based perforated film satisfies the above condition, the moisture absorption rate of the absorbent containing the above breathable film can be effectively controlled.

[0069] According to one embodiment of the present invention, the polyolefin-based perforated film may have an average diameter of perforations of 0.01 to 2.0 mm, specifically 0.05 to 1.5 mm, specifically 0.1 to 1.0 mm, and specifically 0.3 to 0.5 mm, but is not limited thereto.

[0070] According to one embodiment of the present invention, the polyolefin-based perforated film may have a perforation rate of 0.1 to 50%, specifically 0.3 to 40%, specifically 0.4 to 30%, specifically 0.4 to 20%, specifically 0.5 to 10%, specifically 0.5 to 5%, but is not limited thereto. In this case, the perforation rate refers to the percentage of the total sum of perforated areas relative to a unit area. The perforation rate range is controlled within the average diameter range of the perforations, and the moisture absorption rate can be controlled more effectively depending on the combination thereof.

[0071] According to one embodiment of the present invention, the polyurethane-based adhesive may be a polyurethane adhesive derived from a polyester-based polyol and a polyether-based polyol.

[0072] The desiccant can be introduced into the internal space of the housing and can be formed in various shapes such as powder, granule, pellet, tablet, or disc, but it is preferable to form it in powder form. This is because when the desiccant is formed in powder form, the moisture absorption surface area becomes relatively larger than that of a conventional desiccant contained and fixed inside a pouch.

[0073] The above-mentioned desiccant may be included in an amount of 80 volume% or less of the internal space of the housing. Specifically, it may be included in an amount of 20 to 75 volume%, and specifically, it may be included in an amount of 30 to 70 volume%.

[0074] In this way, by filling the internal space of the housing with a predetermined proportion rather than completely filling it with a desiccant, a buffer space is formed within the internal space through which the desiccant can flow. Furthermore, thanks to this buffer space, the desiccant can flow within the internal space of the housing and be uniformly mixed, thereby improving the moisture absorption capacity of the desiccant.

[0075] The above-mentioned desiccant is not limited to any commonly used desiccant, and specifically, it may be a solidifying desiccant or a gel-type desiccant, or a mixture thereof, but is not limited thereto.

[0076] The above-mentioned solidifying moisture absorbent is described.

[0077] The above-mentioned solidifying hygroscopic agent may include at least one or more hygroscopic materials selected from the group consisting of magnesium chloride, calcium chloride, and sodium carbonate, and at least one hardenable inorganic material selected from the group consisting of magnesium oxide and calcium oxide.

[0078] In addition, the weight ratio of the hygroscopic material to the curable inorganic material in the solidifying desiccant may be 1:0.1 to 2, preferably 1:0.2 to 1.5, and more preferably 1:0.4 to 1.5.

[0079] When a solidifying desiccant is configured in this way, the moisture absorption rate of the desiccant can be high and the moisture release rate can be low.

[0080] The solidifying desiccant comprises a hygroscopic material containing at least one selected from the group consisting of magnesium chloride, calcium chloride, and sodium carbonate to possess moisture absorption capabilities; considering its excellent moisture absorption capacity and low moisture release capacity, it is preferable to use magnesium chloride as the hygroscopic material. Magnesium chloride not only has excellent moisture absorption capacity but also exhibits excellent moisture absorption rate and moisture absorption duration when combined with other components, while having a low moisture release capacity.

[0081] Such magnesium chloride may be included in an amount of 10 to 50 weight%, preferably 20 to 45 weight%, and more preferably 25 to 40 weight% based on the total weight of the desiccant. When magnesium chloride is included in the desiccant in such proportions, the moisture absorption rate of the desiccant is optimized, the decrease in the sustainability of moisture absorption due to excessive moisture absorption can be prevented, and the release of moisture can be efficiently suppressed.

[0082] The above-mentioned solidifying desiccant comprises a curable inorganic material including at least one selected from the group consisting of magnesium oxide and calcium oxide to prevent the desiccant from liquefying and to cause it to harden when it absorbs moisture.

[0083] By including two types of magnesium oxide with different specific gravities, the hardenable inorganic material can optimize the moisture absorption rate of the desiccant, enable the desiccant to maintain continuous moisture absorption capacity for a long period of time, and have the effect of preventing the release of absorbed moisture when the temperature around the desiccant rises rapidly.

[0084] Meanwhile, the above-mentioned solidifying hygroscopic agent may include polymer wax in addition to hygroscopic materials and curable inorganic materials.

[0085] The above-mentioned solidifying hygroscopic agent includes polymer wax, which not only improves moisture absorption capacity but also minimizes moisture release in environments with high temperature and low humidity, and can maintain continuous moisture absorption capacity.

[0086] In addition, the above-mentioned solidifying hygroscopic agent may further include alkali metal phosphate.

[0087] The alkali metal phosphate included in the above-mentioned solidifying desiccant may be an alkali metal ion selected from lithium, sodium, potassium, etc. By including the alkali metal phosphate, the solidifying desiccant can effectively suppress expansion due to moisture absorption and can absorb moisture for a long time even in high-humidity environments.

[0088] According to one aspect of the present invention, the solidifying hygroscopic agent may comprise at least one or more hygroscopic materials selected from the group consisting of magnesium chloride, calcium chloride, and sodium carbonate; a hardenable inorganic material comprising at least one selected from the group consisting of magnesium oxide and calcium oxide; and an alkali metal phosphate.

[0089] A gel-type hygroscopic agent according to another aspect of the present invention will be described.

[0090] The gel-type hygroscopic agent may comprise at least one hygroscopic material selected from the group consisting of magnesium chloride and sodium carbonate; and one or more hygroscopic copolymers selected from polyacrylate and polyacrylate metal salts.

[0091] According to one embodiment of the present invention, the gel-type desiccant may gel upon absorbing moisture, thereby maximally suppressing the release of the absorbed moisture to the outside of the desiccant.

[0092] The above gel-type hygroscopic agent comprises a hygroscopic material including at least one selected from the group consisting of magnesium chloride and sodium carbonate, wherein magnesium chloride is preferred as the hygroscopic material considering its excellent moisture absorption capacity and low moisture release capacity. Magnesium chloride not only has excellent moisture absorption capacity, but also, when combined with other components, has excellent moisture absorption rate and moisture absorption duration capacity, and low moisture release capacity.

[0093] The above hygroscopic copolymer is not limited to any hygroscopic copolymer resin, but specifically may comprise one or more hygroscopic copolymers selected from polyacrylate, polyacrylate metal salt, ethylene maleic anhydride copolymer, cross-linked carboxymethylcellulose, polyvinyl alcohol copolymer, and cross-linked polyethylene oxide; specifically, it may be polyacrylate and / or polyacrylate metal salt, and specifically, it may be polyacrylamide copolymer and / or polyacrylamide metal salt. In the above polyacrylamide metal salt, the metal may be one or more selected from magnesium, calcium, sodium, potassium, rubidium, and cesium, but is not limited thereto. In the case of a hygroscopic composition mixed with the above polyacrylamide metal salt, starch, and magnesium chloride, it has the advantage of firmly gelling upon moisture absorption, thereby suppressing moisture release.

[0094] The weight-average molecular weight of the above polyacrylamide metal salt may be 10,000 to 10,000,000 g / mol, specifically 100,000 to 8,000,000 g / mol, specifically 1,000,000 to 7,000,000 g / mol, specifically 3,000,000 to 6,500,000 g / mol, specifically 5,000,000 to 6,500,000 g / mol, but is not limited thereto.

[0095] In addition, the gel-type hygroscopic agent may further include a hygroscopic aid, and the hygroscopic aid may include one or more selected from starch, hydrophilic polymers, and polymer coagulants.

[0096] The above starch may be one or more selected from tapioca starch, corn starch, potato starch, glyceryl starch, aluminum starch octenyl succinate, and calcium starch octenyl succinate, and specifically may be one or more selected from tapioca starch, corn starch, and potato starch, and specifically may be corn starch, but is not limited thereto.

[0097] According to one embodiment of the present invention, the hydrophilic resin may comprise one or more selected from polyacrylic acid, polymethacrylic acid, polyethylene glycol, polyvinyl alcohol, gelatin, polyethyleneimine, polyvinylpyrrolidone, and polyalkylene oxide.

[0098] The above polymer coagulant may use an organic polymer, or an inorganic polymer, or may include both an organic polymer and an inorganic polymer.

[0099] In particular, excellent performance improvements such as increased moisture absorption rate and increased release resistance can be achieved through the synergistic effect of the gel-type hygroscopic composition and organic and inorganic polymers.

[0100] This is a specific phenomenon that is manifested by the interaction between organic and inorganic polymers within the above-mentioned gel-type hygroscopic composition, and is a significant effect that occurs through complex mechanisms such as interfacial interaction between materials, intermolecular bonding, and the formation of a network structure.

[0101] The mixing ratio of the above organic polymer and inorganic polymer is 7:3 to 9:1, and when the proportion of the organic polymer is high, the moisture absorption rate and release resistance become excellent.

[0102] According to one embodiment of the present invention, a high proportion of the organic polymer improves the physical stability and processability of the gel, thereby enabling long-term moisture absorption performance to be maintained in various environments.

[0103] As the above-mentioned hygroscopic composition satisfies the above content range, it has the advantage of having a low release rate not only in high-temperature and high-humidity environments but also in low-temperature and high-humidity environments.

[0104] According to one embodiment of the present invention, the organic polymer may comprise one or more selected from polyacrylamide, ethaneamin, N,N,N-trimethyl-2-[(1-oxo-2-propenyl)oxy]-chloride and 2-propenamide-containing polymers, but is not limited thereto.

[0105] According to one aspect of the present invention, the inorganic polymer may comprise one or more selected from polyaluminum chloride, polyaluminum sulfate, polyaluminum sulfate silicate, polyaluminum chloride silicate, polyaluminum chloride calcium, and polyaluminum hydroxide chloride silicate.

[0106] According to one embodiment of the present invention, the gel-type hygroscopic agent may comprise 1 to 80 parts by weight of the hygroscopic copolymer per 100 parts by weight of the hygroscopic material, and specifically, may comprise 1 to 60 parts by weight of the hygroscopic copolymer.

[0107] In addition, according to one embodiment of the present invention, the gel-type hygroscopic agent may comprise 1 to 80 parts by weight of the hygroscopic copolymer and 1 to 80 parts by weight of the hygroscopic aid per 100 parts by weight of the hygroscopic material, and specifically, may comprise 1 to 60 parts by weight of the hygroscopic copolymer and 1 to 60 parts by weight of the hygroscopic aid.

[0108] As the above gel-type desiccant satisfies the above content range, it has the advantage of having a low release rate in high temperature and high humidity environments as well as a low release rate in low temperature and high humidity environments.

[0109] According to one embodiment of the present invention, the gel-type desiccant may have a moisture absorption rate of 150% or more at 50°C and 95% relative humidity, specifically 160% or more, specifically 180% or more, specifically 200% or more, specifically 250% or more, specifically 300% or more, specifically 250 to 320%, but is not limited thereto.

[0110] According to one embodiment of the present invention, the gel-type desiccant may have a percentage of release amount of 60% or less under conditions of 80°C, relative humidity 30%, and 2 hr relative to the amount of moisture absorbed over 14 days at 50°C and relative humidity 95%, specifically 50% or less, and specifically 40% or less, but is not limited thereto.

[0112] The present invention will be explained in more detail below based on the following examples and comparative examples. However, the following examples and comparative examples are merely illustrative of the present invention and are not intended to limit the present invention.

[0114] Moisture-absorbing film performance evaluation

[0115] 1. Gulliver transmittance

[0116] The time it takes for 150 ml of air to pass through was measured using a Gurley densometer (KP-M4350, Gibae E&T).

[0118] 2. Tensile strength

[0119] The above tensile strength is a value measured according to MS210-08 (Technical Standard for Desiccants for Headlamp Moisture Removal). The measurement method is performed with a specimen size of 10 mm * 60 mm and a displacement speed of 50 mm / min. As shown in Figure 1, the distance between the grips is set to 50 mm, and the test specimen is mounted so that it is evenly gripped on the upper and lower grips. The test is performed by mounting the test specimen so that both ends are evenly gripped by at least 10 mm on each of the tensile testing machine grips.

[0121] Moisture-absorbing Product Performance Evaluation

[0122] 3. Moisture absorption rate

[0123] The above moisture absorption rate was measured using a constant temperature and humidity chamber at a temperature of 50±2 ℃ and a relative humidity of 95±5% after 14 days. The above moisture absorption rate was calculated as shown in Equation 1 below.

[0124] [Equation 1]

[0125]

[0127] 4. Moisture absorption rate

[0128] The moisture absorption rate was measured after exposing the specimen to a temperature of 50±2 ℃ and a relative humidity of 95±5% for 2 hours using a constant temperature and humidity chamber, and the moisture absorption rate was calculated using the following Equation 2.

[0129] [Equation 2]

[0130]

[0132] 5. Emission rate

[0133] First emission rate measurement

[0134] 1. After absorbing moisture for 48 hours at a temperature of 23℃ and a relative humidity of 50% using a constant temperature and humidity chamber, the release rate was measured after exposure to a dryer at a temperature of 70℃ and a relative humidity of 10% or less for 2 hours.

[0135] Second emission rate measurement

[0136] 2. After absorbing 100% of the moisture from the absorbent at a temperature of 40℃ and a relative humidity of 90% using a constant temperature and humidity chamber, the release rate was measured after being exposed to a dryer at 80℃ and a relative humidity of 10% or less for 2 hours.

[0138] [Equation 3]

[0139]

[0141] <Manufacturing Example 1> Manufacture of triple-blank packaging material

[0142] Polyester spunbond nonwoven fabric (basis weight 30g / m² 2 A polyurethane adhesive was applied to one side of (CAS No. 25038-59-9), and a polypropylene film (CAS No. 9003-07-0) was adhered to the applied adhesive. Subsequently, a polyurethane adhesive (product of Hichem) was applied to the polypropylene film, and an average of 20 pieces / cm² were attached to the applied adhesive. 2 A triple-layer plain film was manufactured by bonding a polypropylene perforated film (CAS No. 9003-07-0, cast PP film, thickness 25 μm) having perforations. The above triple-layer plain film was manufactured by a dry lamination process.

[0144] <Preparation Example 2> Injection molding of a perforated bracket with a breathable film inserted

[0145] The method for manufacturing a perforated bracket with a breathable film inserted according to the present invention is as follows. First, a design is made for a perforated bracket into which a breathable film is to be inserted, and then the breathable film is accurately positioned in the designed mold. At this time, the film is fixed inside the mold so that the film can be stably bonded to the bracket during injection molding. Subsequently, an ethylene-propylene copolymer (Daeha Co., Ltd., M1352) is melted at 200 to 220 ℃ using an injection molding machine.

[0146] It is injected into the mold. The plastic material wraps around the breathable film, ensuring a strong bond between the film and the bracket. After injection, the mold is cooled to solidify the plastic, at which point the perforated bracket is demolded from the mold to complete the final product. The perforated area of ​​the perforated bracket is approximately 10%.

[0148] <Manufacture of desiccants>

[0149] <Example 1>

[0150] A desiccant was prepared by uniformly mixing 45 g of magnesium chloride (Aldrich), 30 g of polyacrylamide-sodium methacrylate (NAP-701), and 25 g of polyvinyl alcohol (Elvanol™ 71-30, Kuraray, viscosity 27.0 to 33.0 mPa·s) as hygroscopic materials using a mixer. 25 g of the prepared desiccant was introduced into an integrated moisture control module comprising a perforated bracket into which the triple-layer plain packaging material of Preparation Example 1 was inserted to produce a moisture-absorbing product. The moisture absorption rate, absorption rate, and release rate of the prepared moisture-absorbing product were measured and listed in Table 1 below.

[0152] <Example 2>

[0153] The same procedure was carried out in Example 1, except that a perforated bracket with an insert of EVA-coated Tyvek (a fabric provided by Dupont) packaging material was used instead of the triple plain packaging material of Preparation Example 1.

[0155] <Comparative Example 1>

[0156] The procedure was carried out in the same manner, except that a conventional dust cover (Publication No. 10-2024-0131663) was used instead of the integrated moisture control module combined with the perforated bracket of Preparation Example 2. The dust cover used was the triple-layer plain paper of Preparation Example 1.

[0158] MgCl2 SAP organic desiccant 50℃, 95% RH Moisture absorption rate (% / 2hr) Moisture absorption rate (%) emission rate situation PAPM 14th 1st Emission Rate Measurement (%) 2nd Emission Rate Measurement (%) Example 1 45 30 25 6.46 277.52 0 0.41 Gel Example 2 45 30 25 6.43 273.64 0.2 2.5 Gel Comparative Example 1 45 30 25 17.99 192.12 5 5.0 Gel

[0160] [Gel Structure Stability Test - Vibration Environment]

[0161] <Test Objective>

[0162] We evaluated whether the hygroscopic composition, gelled after moisture absorption, maintained structural stability in a vibration environment.

[0164] <Test Conditions and Methods>

[0165] Specimen Preparation: An integrated moisture control module for the example and comparative example was prepared.

[0166] Hygroscopic pretreatment: The specimens were stored in a constant temperature and humidity chamber for 14 days under conditions of 50±2℃ and 95±5% RH to induce sufficient hygroscopic absorption and gelation.

[0167] [Vibration Conditions]

[0168] Up-down vibration 8 hours, left-right vibration 8 hours, test frequency 33Hz, 4.5G

[0170] Whether the breathable film is damaged after vibration result Example 1 ○ (Maintained) stability Example 2 △ (Slightly damaged) Slightly stable Comparative Example 3 △ (Slightly damaged) Slightly stable

[0172] As described above, the present invention has been explained by specific details, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. Those skilled in the art can make various modifications and variations from this description.

[0173] Accordingly, the scope of the present invention is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0175] Housing: 10 Through-hole bracket: 20 First through-hole bracket: 21 Second through-hole bracket: 22 Breathable film: 23 Integrated moisture control module: 100

Claims

Claim 1 An integrated moisture control module comprising: a housing having a space formed inside and an open top; a desiccant installed inside the housing; a perforated bracket fixed to the open top of the housing; and a breathable film embedded in the perforated bracket in an insert manner, wherein the perforated bracket includes a first perforated bracket and a second perforated bracket, the breathable film is inserted between the first perforated bracket and the second perforated bracket, and the perforated bracket has a perforation ratio of 1 to 50%. Claim 2 delete Claim 3 delete Claim 4 An integrated moisture control module according to claim 1, wherein the perforated bracket is manufactured by injection molding. Claim 5 An integrated moisture control module according to claim 1, wherein the perforated bracket is disc-shaped. Claim 6 An integrated moisture control module according to claim 1, wherein the breathable film is a laminate of a polyester nonwoven fabric layer, a polyolefin breathable layer, and a polyolefin-based perforated film layer. Claim 7 An integrated moisture control module according to claim 6, wherein each layer of the breathable film is bonded with a polyurethane-based adhesive. Claim 8 In claim 6, the gully transmittance of the breathable film is 100 to 3,000 sec, and the moisture permeability of the breathable film is 500 to 6,000 g / m² 2 · 24hrs, integrated humidity control module. Claim 9 In claim 6, the polyolefin-based perforated film has 1 to 500 pieces / cm 2 An integrated moisture control module that is a polyolefin-based perforated film having perforations formed therein. Claim 10 An integrated moisture control module according to claim 1, wherein the desiccant is a solidifying desiccant, a gel-type desiccant, or a mixture thereof. Claim 11 An integrated moisture control module according to claim 10, wherein the solidifying desiccant comprises at least one or two hygroscopic materials selected from the group consisting of magnesium chloride, calcium chloride, and sodium carbonate; a hardenable inorganic material comprising at least one selected from the group consisting of magnesium oxide and calcium oxide; and an alkali metal phosphate. Claim 12 An integrated moisture control module according to claim 10, wherein the gel-type hygroscopic agent comprises at least one hygroscopic material selected from the group consisting of magnesium chloride and sodium carbonate; and one or more hygroscopic copolymers selected from polyacrylate and polyacrylate metal salts.

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