Case-integrated moisture absorbent product

Abstract

The present invention relates to a case-integrated moisture absorbent product. Specifically, the present invention provides a case-integrated moisture absorbent product comprising: a housing having an accommodation space formed therein and having an open upper side; an air-permeable film disposed on the upper surface of the housing to seal the accommodation space; and an outer cover disposed on the upper side of the air-permeable film. A moisture absorbent is disposed in the accommodation space. The upper surface of the housing includes a first welding portion formed in an area in contact with the air-permeable film, and a groove line spaced apart from the first welding portion and formed on the outside. The outer cover includes a second welding portion corresponding to the groove line. The air-permeable film is coupled to the housing by thermal fusion of the first welding portion. The outer cover is coupled to the housing by thermal fusion of the second welding portion.

Description

Moisture-absorbing product with integrated case

[0001] The present invention relates to a case-integrated moisture-absorbing product.

[0002] Generally, desiccant products are widely used by being placed inside packaging boxes to protect products from moisture during packaging or transportation, and conventionally, they are also widely used in products requiring humidity control, such as automotive lamps and electronic products.

[0003] The above moisture-absorbing products are mainly pouch-type products filled with a desiccant, and for special applications, products such as those containing a desiccant agent in the receiving space of a dust cover container and covered with a breathable film are used.

[0004] The breathable film used in the above moisture-absorbing product is required to have excellent breathability to effectively absorb external moisture, while also having the function to stably absorb ambient moisture over a long period by appropriately controlling the absorption rate.

[0005] The desiccant contained in the receiving space of the dust cover expands as it absorbs moisture, and the expanded desiccant causes the breathable film to protrude toward the interior of the vehicle lamp. As this protruding breathable film comes into contact with components, such as light source lamps installed inside the vehicle lamp, the breathable film or the corresponding components may be damaged.

[0006] In addition, although the partition between the breathable film and the dust cover housing is bonded using heat or adhesive, the bonded area may detach due to vibration or external physical factors, causing the internal desiccant to leak out.

[0007] The present invention provides a dust cover for an automobile lamp that effectively removes moisture from inside the automobile lamp.

[0008] In addition, the present invention prevents the breathable film of a dust cover for an automobile lamp from being torn by external impact or the breathable film from expanding outward due to the expansion of a moisture absorbent.

[0009] In addition, the present invention prevents the joint portion between the breathable film and the partition wall of the dust cover housing from separating due to external impact or vibration.

[0010] The present invention provides a case-integrated moisture-absorbing product comprising: a housing having an internal receiving space formed therein and an open top side; a breathable film disposed on the upper surface of the housing to seal the receiving space; and an outer cover disposed on the upper side of the breathable film, wherein a moisture absorbent is disposed in the receiving space, and the upper surface of the housing includes a first welding portion formed in an area in contact with the breathable film and a groove line formed on the outer side spaced apart from the first welding portion, and the outer cover includes a second welding portion corresponding to the groove line, wherein the breathable film is joined to the housing by thermal fusion of the first welding portion and the outer cover is joined to the housing by thermal fusion of the second welding portion.

[0011] According to one embodiment of the present invention, the volume of the second welding portion relative to the volume of the groove line may be 1:0.5 to 1.5.

[0012] According to one embodiment of the present invention, the cross-sections of the first welding portion and the second welding portion may be polygonal in shape.

[0013] According to one embodiment of the present invention, the first welding part and the second welding part may comprise a plurality of parts.

[0014] According to one embodiment of the present invention, the first welding portion may comprise two or more.

[0015] According to one embodiment of the present invention, the second welding portion may comprise two or more.

[0016] According to one embodiment of the present invention, the outer cover may include a perforated outer cover.

[0017] According to one embodiment of the present invention, the perforated outer cover may have a perforation ratio of 5 to 50% relative to the total outer surface area.

[0018] According to one embodiment of the present invention, the perforated outer cover may be circular.

[0019] According to one embodiment of the present invention, the housing may be cylindrical.

[0020] According to one embodiment of the present invention, the absorbent may include a solidifying absorbent, a gel absorbent, or a mixture thereof.

[0021] 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.

[0022] 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; one or more hygroscopic copolymers selected from polyacrylate and polyacrylate metal salts; and starch.

[0023] The case-integrated moisture-absorbing product according to the present invention is provided with a welding line, so that a breathable film and an outer cover are heat-fused to the welding line to have robust durability.

[0024] In addition, the case-integrated moisture-absorbing product according to the present invention allows the breathable film and the outer cover to be firmly combined without additional parts such as auxiliary pillars.

[0025] Figure 1 is an overall schematic diagram of one embodiment of a case-integrated moisture-absorbing product.

[0026] Figure 2 is an image showing a cross-section of one embodiment of a case-integrated moisture-absorbing product.

[0027] Figure 3 is a schematic diagram of the first welding line of a case-integrated moisture-absorbing product housing.

[0028] Figure 4 is an image showing the entire cross-section of one embodiment of a case-integrated moisture-absorbing product housing.

[0029] Figure 5 is an image showing a partial cross-section of one embodiment of a case-integrated moisture-absorbing product housing.

[0030] Embodiments of the present invention are described in detail below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0031] Throughout the entire specification of the invention, when a member is described as being located "on" another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members.

[0032] Throughout this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Throughout this specification, terms of degree such as "about," "substantially," etc., are used to mean at or near the stated value when inherent manufacturing and material tolerances are presented in the stated meaning, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which precise or absolute values ​​are mentioned to aid in understanding the invention. Throughout this specification, terms of degree such as "step of" or "step of" do not mean "step for."

[0033] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings and the contents described below. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Throughout the specification, the same reference numerals indicate the same components.

[0034] All numerical ranges described in this specification include both end values, and combinations of partial ranges and threshold values ​​derived therefrom are also interpreted as being included in the present invention.

[0035] Terms such as 'approximately' and 'substantially' include manufacturing and physical property tolerances in the relevant field.

[0036] The unit is g / m 2 In principle, the values ​​are / day, cmH2O, ml, µm, N / 25.4 mm. Unless otherwise specified, the water vapor permeability (WVTR) is a value according to KS K 0594 (cup method, 40℃, 90 %RH, 24 h), and the water pressure resistance is a value according to ISO 811 (pressure rise rate 10 cmH2O / min, leakage criterion: 3 drops). The above water pressure resistance is measured as pressure rise rate × time until leakage occurs.

[0037] In this specification and claims, 'sealed' is used to mean 'sealed' and includes a state in which the permeability of water vapor and air is permitted but the penetration of liquid is prevented, depending on the characteristics of the breathable film.

[0038] In this specification, "joint / connection" includes not only direct joint / connection but also indirect joint / connection mediated by other members. "Located on" includes not only direct contact but also the interposition of an intermediate layer.

[0039] In this specification, 'upper side / upper surface' refers to the open side of the receiving space / the corresponding surface regardless of the assembly / installation direction.

[0040] In this specification, 'welding part / welding line' is interpreted as a heat sealing part / welding line depending on the context, and may include ultrasonic welding to the extent that there is no technical contradiction. That is, in this specification, 'groove line' refers to a recessed structure (groove) formed on the upper surface of the housing.

[0041] In this specification, 'perforation / perforated outer cover / perforation ratio' is interpreted as having the same meaning as 'perforation / perforated outer cover / perforation rate,' respectively.

[0042] In this specification, the 'volume' of linear elements such as ribs, welds, and grooves is defined as the corresponding cross-sectional area × extension length (based on the centerline) unless otherwise stated. For the convenience of design and measurement, this may be replaced with a ratio of cross-sectional areas and shall be interpreted as having the same intent.

[0043] In this specification, 'perforation ratio (perforation rate)' refers to the percentage of the total perforated area relative to the total area of ​​the outer cover. 'Total outer area' refers to the total projected area of ​​the outer cover.

[0044] In this specification, 'plural' means two or more. 'Separated' means spatially separated and includes not in direct contact.

[0045] In this specification, 'circular / cylindrical' includes polygonal approximation shapes considering manufacturing tolerances and design variations. 'Polygonal shapes' include, but are not limited to, rectangles, trapezoids, triangles (e.g., isosceles triangles), etc.

[0046] In this specification, 'welding part' refers to a protruding shaped element for welding, and 'welding line' refers to a linear trajectory of welding formed or planned by the welding part. Depending on the context, 'second welding line' refers to a welding section formed by the 'second welding part'.

[0047] In this specification, 'case-integrated moisture-absorbing product' may also be expressed as 'case-integrated moisture-absorbing module'.

[0048] Hereinafter, the configuration of an integrated moisture-absorbing product dust cover according to one embodiment of the present invention will be described.

[0049] In the case of conventional moisture-absorbing dust covers, a breathable film is sealed at an opening on one side of the housing; however, this sealing process is not evenly sealed, resulting in inconsistent moisture absorption. Additionally, the breathable film is directly exposed to the outside, posing a risk of damage from external impacts. Furthermore, due to the uneven sealing process, the bonding strength of the breathable film with the housing may frequently deteriorate due to vehicle vibrations.

[0050] In addition, even if an outer cover is placed over the breathable film to protect it, the bonding force between the breathable film and the housing is weak, so the outer cover may detach due to vehicle vibration.

[0051] To compensate for this, it is possible to implement a system that combines the hollow column and the outer cover by physically joining them, but there is a problem in that a gap occurs in the breathable film at the joint between the hollow column and the outer cover.

[0052] In addition, even if a breathable film is bonded to one side of the hollow column, the bonding area is small, so a problem may arise where it easily detaches due to prolonged vehicle vibration.

[0053] In other words, while the breathable film can be primarily protected by attaching an external cover to a hollow column, the bond between the breathable film and the housing remains weak, leading to the problem of easy separation due to vehicle vibration. To solve this, the inventor has developed the following configuration.

[0054] The present invention comprises a housing having an internal receiving space formed therein and an open top side, a breathable film disposed on the upper surface of the housing to seal the receiving space, and an outer cover disposed on the upper side of the breathable film, wherein a desiccant is disposed in the receiving space.

[0055] The problem is solved by providing a case-integrated moisture-absorbing product characterized in that the upper surface of the housing includes a first welding portion formed in an area in contact with the breathable film and a groove line formed on the outer side spaced apart from the first welding portion, and the outer cover includes a second welding portion corresponding to the groove line, wherein the breathable film is joined to the housing by thermal fusion of the first welding portion and the outer cover is joined to the housing by thermal fusion of the second welding portion.

[0056] The present invention can fix the breathable film with superior adhesive strength compared to when bonded with a general adhesive by heat-fusing the bond between the breathable film and the housing.

[0057] Furthermore, the present invention has a first welding portion in the form of a protrusion disposed on the upper surface of the housing, so that the first welding portion is in close contact with the breathable film, and subsequently, as the first welding portion melts through heat fusion and penetrates into the breathable film to be fixed, the adhesion to the breathable film can be superior to that of conventional melt bonding on a flat surface.

[0058] In addition, unlike conventional moisture-absorbing dust covers, the case-integrated moisture-absorbing product of the present invention has an outer cover attached to the upper surface of the housing, so that the breathable film can be protected from external impact.

[0059] Furthermore, in the present invention, a second welding line is formed on the outer cover, and the second welding line is joined to the upper surface of the housing by heat fusion to protect the breathable film from significant external impact.

[0060] Furthermore, since the second welding line is joined to a recessed groove line rather than a flat surface on the upper surface of the housing and subsequently heat-fused, the outer cover is not separated from the housing even under a large impact, thereby protecting the breathable film.

[0061] According to one embodiment of the present invention, the volume of the second welding part relative to the volume of the groove line may be 1:0.5 to 1.5, the volume of the second welding part relative to the volume of the groove line may be 1:0.5 to 1.1, the volume of the second welding part relative to the volume of the groove line may be 1:0.5 to 1.0, and the volume of the second welding part relative to the volume of the groove line may be 1:0.5 to 0.9, but is not limited thereto.

[0062] According to one embodiment of the present invention, the cross-sections of the first welding portion and the second welding portion may be polygonal, square, or triangular, and specifically may be rectangular, trapezoidal, or isosceles triangle, but are not limited thereto.

[0063] In addition, the first welding part and the second welding part may be formed in the shape of multiple pillars, or may be formed in the shape of a single line, and preferably may be formed in the shape of a line.

[0064] When formed in the above line shape, it can be fused densely during heat fusion, so the airtightness of the breathable film and the adhesion of the outer cover can be even better.

[0065] According to one embodiment of the present invention, the first welding part and the second welding part may comprise a plurality of parts.

[0066] According to one embodiment of the present invention, the first welding portion may be 2 or more, 3 or more, 4 or more, or 5 or more, and the second welding portion may be 2 or more, 3 or more, 4 or more, or 5 or more, but is not limited thereto.

[0067] When the above-mentioned first welding portions are multiple, preferably two or more, preferably three or more, or more, the degree of sealing with the breathable film during heat fusion can be further improved, and accordingly, the hygroscopicity of each product is consistent, thereby increasing the reliability of the product, and by sealing more tightly, the probability of the desiccant leaking to the outside can be reduced.

[0068] In addition, for example, if the first welding portion includes a plurality of innermost first welding portions and outermost first welding portions, the volume of the innermost first welding portion may be smaller than the volume of the outermost first welding portion, and preferably, it may satisfy Equation 1 or Equation 2 below. When the above volume ratio is satisfied, there is an advantage that the transmission of ultrasonic force during ultrasonic welding is easy, and at the same time, the bonding between the breathable film and the housing is excellent.

[0069] [Equation 1]

[0070]

[0071] [Equation 2]

[0072]

[0073] In addition, if there are multiple second welding parts, preferably two or more, preferably three or more, or more, the bonding strength with the housing can be very excellent. Also, naturally, the number of groove lines corresponds to the number of second welding parts.

[0074] The above thermal fusion may adopt an ultrasonic thermal fusion method.

[0075] In the case of the above ultrasonic heat fusion, the welding line can be precisely melted so that the surrounding area is not crushed, and for example, only the part of the breathable film that is joined to the welding line is melted, so the part of the breathable film that is not touched by the ultrasonic heat fusion can be preserved without damage.

[0076] In addition, there is an advantage in that ultrasonic thermal fusion can be performed more precisely on each of the multiple welding lines.

[0077] According to one embodiment of the present invention, the outer cover may include a perforated outer cover.

[0078] According to one embodiment of the present invention, the perforated outer cover may be circular, but is not limited thereto if the cross-section parallel to the lower surface of the housing is identical to any one of a polygon, an ellipse, or a circle.

[0079] The above-mentioned perforated outer cover and housing are fixed, and the method of fixation is joined by heat fusion as previously described.

[0080] According to one embodiment of the present invention, the perforated outer cover comprises a plurality of perforations, and the perforations may extend radially, but the positions of the perforations are not limited.

[0081] According to one embodiment of the present invention, the perforated outer cover may include a straight crossbar and a cylindrical crossbar between the perforations.

[0082] According to one embodiment of the present invention, the perforated outer cover may have a perforation ratio of 5 to 60% relative to the total outer cover.

[0083] Next, breathable films will be explained.

[0084] 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.

[0085] For example, the above breathable film has a moisture permeability of 5 to 600 g / m² 2 It is / day, and the water pressure resistance may be 1 to 30 cmH2O, and preferably the moisture permeability is 10 to 500 g / m² 2 It is / day, and the water pressure resistance may be 5 to 25 cmH2O, and more preferably the moisture permeability is 20 to 400 g / m² 2 It can be formed from a material that has a water pressure resistance of 10 to 20 cmH2O and a water vapor per day. In this case, the water vapor permeability is a value measured according to KS K 0594, and the water pressure resistance is a value measured according to ISO 811-1981.

[0086] 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 case-integrated moisture-absorbing product. 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 case-integrated moisture-absorbing product, from penetrating the breathable film and entering the interior of the automobile lamp.

[0087] 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 passes through the breathable film.

[0088] For example, the breathable film may be formed from a material having an air permeability of 500 to 700 ml / min and a tensile strength of 140 to 210 N / 2.54 cm, preferably with an air permeability of 450 to 650 ml / min and a tensile strength of 150 to 190 N / 2.54 cm, and more preferably with an air permeability of 400 to 600 ml / min and a tensile strength of 160 to 180 N / 2.54 cm. In this case, the air permeability is a value measured according to ISO 5636-3 and the tensile strength is a value measured according to ISO 1924-2 (specimen width 25.4 mm, tensile speed 100 mm / min, 20 °C / 65 %RH), satisfying the specified standards in both MD and CD directions.

[0089] 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.

[0090] 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.

[0091] 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 desiccant, 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.

[0092] 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.

[0093] 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.

[0094] According to one embodiment of the present invention, the gully 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 Gulli 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.

[0095] The above polyester nonwoven fabric layer may include a polyester-based nonwoven fabric.

[0096] 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.

[0097] In addition, the polyester nonwoven fabric may be manufactured by methods such as needle punching, thermal bonding, spun bonding, melt blowing, or spunlacing, but is not limited thereto.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] As the number of perforations in the above polyolefin-based perforated film satisfies the above condition, the moisture absorption rate of the absorbent including the packaging material for the absorbent can be effectively controlled.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] The above-mentioned desiccant is described. The above-mentioned desiccant may be combined with the above-mentioned breathable film and referred to as a moisture-absorbing part. The above-mentioned moisture-absorbing part is responsible for controlling the moisture absorption rate, absorption rate, and release rate of the above-mentioned integrated desiccant case, and its effect may be further enhanced due to factors such as airtightness caused by the above-mentioned outer cover and the above-mentioned welding line.

[0107] 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.

[0108] 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%.

[0109] 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.

[0110] 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.

[0111] The above-mentioned solidifying moisture absorbent is described.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] Meanwhile, the above-mentioned solidifying hygroscopic agent may include polymer wax in addition to hygroscopic materials and curable inorganic materials.

[0120] 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.

[0121] In addition, the above-mentioned solidifying hygroscopic agent may further include alkali metal phosphate.

[0122] 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.

[0123] 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.

[0124] A gel-type hygroscopic agent according to another aspect of the present invention will be described.

[0125] The gel-type hygroscopic agent may comprise at least one hygroscopic material selected from the group consisting of magnesium chloride and sodium carbonate; one or more hygroscopic copolymers selected from polyacrylate and polyacrylate metal salts; and starch.

[0126] 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.

[0127] In addition, the above hygroscopic material has been described previously, so it is omitted here.

[0128] 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.

[0129] The weight-average molecular weight of the above polyacrylamide metal salt may be 10,000 to 1,000,000 g / mol, specifically 10,000 to 700,000 g / mol, specifically 10,000 to 500,000 g / mol, specifically 10,000 to 300,000 g / mol, specifically 10,000 to 200,000 g / mol, but is not limited thereto.

[0130] 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.

[0131] 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 starch with respect to 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 starch.

[0132] 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.

[0133] According to one embodiment of the present invention, the gel-type desiccant may have an 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.

[0134] According to one embodiment of the present invention, the gel-type desiccant may have a percentage of release amount of 10% 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 5% or less, and specifically 3% or less, but is not limited thereto.

[0135] Hereinafter, the operation and effects of the case-integrated moisture-absorbing product for automobile lamps according to the present invention will be described.

[0136] The present invention can suppress the deterioration of the breathable film adhesion caused by external impact by further including a perforated outer cover in the configuration of the housing, absorbent, and breathable film of a conventional case-integrated moisture-absorbing product for automobile lamps, and can also physically suppress the expansion of the breathable film caused by the expansion of moisture in the absorbent.

[0137] The above case-integrated moisture-absorbing product may be formed by combining a perforated outer cover, a breathable film, and a housing in sequence, and may include a moisture absorbent in the internal receiving space of the housing.

[0138] Furthermore, in the case of the case-integrated moisture-absorbing product of the present invention, the installation direction is directed toward the interior of the automobile lamp, so the moisture absorbent may be locally concentrated in one direction of the breathable film due to gravity.

[0139] As the desiccant present in the above-mentioned local space expands, the adhesion between the breathable film in the space and the housing partition wall is continuously reduced, causing a portion of the breathable film to burst and the desiccant inside the housing to leak out.

[0140] Accordingly, as the perforated outer cover is installed on the integrated desiccant dust cover, there is an advantage in that the expansion of the breathable film is suppressed, thereby maintaining the bond between the breathable film and one surface of the housing for a long period of time. Furthermore, the case-integrated moisture-absorbing product of the present invention may have a moisture absorption rate of at least a certain level even when including the perforated outer cover. Specifically, as the perforated outer cover implements an area of ​​5 to 60%, specifically 20 to 50%, of the total outer cover, the moisture absorption rate of the case-integrated moisture-absorbing product may be 50% or more, specifically 60% or more, specifically 70% or more, specifically 70 to 95%, specifically 70 to 90%, specifically 70 to 85%, specifically 70 to 80%, specifically 70 to 80%, but is not limited thereto.

[0141] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0142] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0143] 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.

[0144]

[0145] <Performance Evaluation of Hygroscopic Agents>

[0146] 1. Moisture absorption rate

[0147] The above moisture absorption rate was measured after exposing the specimen to a temperature of 23 ℃ and a relative humidity of 50% for 50 days using a constant temperature and humidity chamber, and the moisture absorption rate was calculated as shown in Equation 1 below.

[0148] [Equation 1]

[0149]

[0150]

[0151] [Preparation Example 1]

[0152] Polyester spunbond nonwoven fabric (basis weight 30g / m² 2A polyurethane adhesive was applied to one surface 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 was applied to the polypropylene film, and an average of 20 pieces / cm² were applied to the applied adhesive. 2 A breathable film was manufactured by bonding a polypropylene perforated film (CAS No. 9003-07-0, cast PP film, thickness 25 μm) having perforations. The breathable film was manufactured by a dry lamination process.

[0153]

[0154] [Preparation Example 2]

[0155] A hygroscopic agent was prepared by uniformly mixing 100 parts by weight of magnesium chloride (Aldrich, 94% purity), 40 parts by weight of polyacrylamide-sodium methacrylate (CAS No. 25085-02-03), and 60 parts by weight of corn starch (Daesang) using a mixer.

[0156]

[0157] [Example 1]

[0158] 35g of the desiccant of Preparation Example 2 was introduced into the housing receiving space of Fig. 1, and the breathable film of Preparation Example 1 was heat-fused to the first welding line on one side of the housing. Subsequently, the second welding line of the outer cover was aligned with the housing groove line and heat-fused to manufacture a dust cover for an automobile lamp. The manufactured dust cover for an automobile lamp was placed in a constant temperature and humidity chamber, and the moisture absorption rate over time was measured as shown in Table 1 below.

[0159]

[0160] [Example 2]

[0161] The procedure was carried out in the same manner as in Example 1, except that ultrasonic welding was performed instead of thermal welding. The dust cover for an automobile lamp manufactured above was placed in a constant temperature and humidity chamber, and the moisture absorption rate over time was measured as shown in Table 1 below.

[0162]

[0163] [Example 3]

[0164] The procedure was carried out in the same manner as in Example 1, except that the first welding line of the housing was two and ultrasonically welded. The dust cover for an automobile lamp manufactured above was placed in a constant temperature and humidity chamber, and the moisture absorption rate over time was measured as shown in Table 1 below.

[0165]

[0166] [Comparative Example 1]

[0167] The procedure was carried out in the same manner as in Example 1, except that the outer cover was not attached. The dust cover for an automobile lamp manufactured above was placed in a constant temperature and humidity chamber, and the moisture absorption rate over time was measured as shown in Table 1 below.

[0168]

[0169] [Comparative Example 2]

[0170] The procedure was carried out in the same manner as in Example 1, except that the breathable film and the outer cover were bonded using a polyurethane adhesive instead of ultrasonic heat fusion. The dust cover for an automobile lamp manufactured above was placed in a constant temperature and humidity chamber, and the moisture absorption rate over time was measured as shown in Table 1 below.

[0171] Moisture absorption rate (%) under conditions 23℃ 50%RH Days elapsed Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 200000 0 6hr 0.53 0.56 0.53 1.42 0.71 12.32 2.27 24.52.84 424.03 22.01 21.53 40.023 0.765 31.27 30.01 28.22 51.66 36.23 846.78 45.99 44.09 67.97 55.11 160.88 60.55 8.22 78.53 68.121 470.5569.5667.1288.0778.882080.1278.1576.0195.1286.672789.2387.9884.12100.1193.123496.1295.1190.02106.12100.1350105.14103.13100.11111.55108.33

[0172] As shown in Table 1, in the case of Examples 1 to 3, which are case-integrated moisture-absorbing products of the present invention, the moisture absorption rate is controlled, and specifically, it was confirmed that the moisture absorption rate remains 100% or less even on the 34th day, and on the 50th day, the moisture absorption rate is maintained at a level similar to that of the comparative examples.

[0173] In contrast, in the case of Comparative Example 1, since there was no external cover, it was confirmed that the moisture absorption rate was very high from the beginning of moisture absorption, and accordingly, it was confirmed that the long-term moisture absorption capacity was lower than that of the example. In addition, in the case of Comparative Example 2, since the breathable film was bonded with a polyurethane adhesive, it was confirmed that the sealing rate was lower than that of heat fusion, and as time passed, the adhesive performance deteriorated, resulting in an excessively high moisture absorption rate.

[0174]

[0175] 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.

[0176] 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.

[0177]

[0178] [Explanation of the symbol]

[0179] Housing: 100

[0180] Capacity: 110

[0181] Moisture absorption area: 200

[0182] Desiccant: 210

[0183] Breathable film: 220

[0184] Outer cover: 300

[0185] Welding line: 400

[0186] 1st Welding Line: 410

[0187] 1st welding line: 420

[0188] 2nd welding line: 310

[0189] Home Line: 500

[0190] Integrated case moisture-absorbing product: 1000

Claims

1. A housing having an internal receiving space and an open top, A breathable film disposed on the upper surface of the housing so as to seal the above receiving space; and It includes an outer cover disposed on the upper side of the above breathable film, and A moisture absorbent is placed in the above receiving space, and The upper surface of the above housing has a first welding portion formed in the area in contact with the breathable film, and It includes a groove line formed on the outer side spaced apart from the first welding part, and The above outer cover includes a second welding portion corresponding to the above groove line, and The above breathable film is joined to the housing by heat fusion of the first welding portion, and A case-integrated moisture-absorbing product characterized in that the outer cover is joined to the housing by heat fusion of the second welding part.

2. In Paragraph 1, A case-integrated moisture-absorbing product in which the volume of the second welding part relative to the volume of the home line is 1:0.5 to 1.

5.

3. In Paragraph 1, A case-integrated moisture-absorbing product in which the cross-sections of the first and second welding parts are polygonal in shape.

4. In Paragraph 1, A case-integrated moisture-absorbing product comprising a plurality of the first welding part and the second welding part.

5. In Paragraph 4, A case-integrated moisture-absorbing product comprising two or more of the above-mentioned first welding portions.

6. In Paragraph 4, A case-integrated moisture-absorbing product comprising two or more of the above-mentioned second welding portions.

7. In Paragraph 1, The above-mentioned outer cover is a case-integrated moisture-absorbing product comprising an outer cover with perforations.

8. In Paragraph 7, The above-mentioned perforated outer cover has a perforation ratio of 5 to 50% relative to the total outer surface area, and is a case-integrated moisture-absorbing product.

9. In Paragraph 7, The above-mentioned perforated outer cover is circular, and the case-integrated moisture-absorbing product.

10. In Paragraph 1, The above housing is a cylindrical case-integrated moisture-absorbing product.

11. In Paragraph 1, The above-mentioned desiccant is a case-integrated desiccant product comprising a solidifying desiccant, a gel-type desiccant, or a mixture thereof.

12. In Paragraph 11, The above-mentioned solidifying hygroscopic agent 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 A case-integrated moisture-absorbing product containing alkali metal phosphates.

13. In Paragraph 11, A case-integrated moisture-absorbing product comprising: at least one moisture-absorbing material selected from the group consisting of magnesium chloride and sodium carbonate; one or more moisture-absorbing copolymers selected from polyacrylate and polyacrylate metal salts; and starch.

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