Manufacturing method for non-flammable magnetic panels

Abstract

To provide an incombustible magnetic panel which is lightweight, thin and flexible, which can be compactly wound to be easily handled at a construction site, which has preferable transportability and workability, and which comprises a secure incombustibility with suppressed temperature increase.SOLUTION: An incombustible magnetic panel is constituted by sticking a steel plate to which a magnet is stuck by magnetic force and which has a thickness so as to have flexibility and a cardboard material impregnated with an incombustible material with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an improvement to a magnetic panel, and more specifically to a non-flammable magnetic panel that is lightweight, thin, and flexible, can be rolled up compactly, making it easy to handle at construction sites, has excellent transportability and workability, and has reliable non-flammability with suppressed temperature rise, and a method for manufacturing the same. [Background technology]

[0002] As is well known, the magnetic force of magnets is widely used to attach memos, flyers, and other notices to walls, and many small items with magnets are also sold. However, there are only a limited number of wall surfaces indoors to which magnets can be directly attached, and it has been necessary to prepare a separate whiteboard or the like, or to use the wall surface of a refrigerator, steel bookshelf, desk, etc. Therefore, the present applicant has proposed a building wall material to which magnets can be attached (see Patent Document 1).

[0003] By the way, in order for such wall materials to which magnets can be attached to be adopted as building materials, the wall materials must meet a certain non-combustibility standard (for example, ISO5660-1: Cone calorimeter heat generation test, heating time of 20 minutes, (1) total heat generation of 8 MJ / m 2 (2) The maximum heat generation rate is 200 kW / m for more than 10 seconds continuously. 2 (3) There must be no cracks or holes penetrating through to the reverse side that are detrimental to fire retardancy.

[0004] Conventionally, panel materials that meet these non-combustible standards have been made by bonding a non-combustible ceramic base material such as cement to a steel plate, but this is nothing more than a combination of two non-combustible base materials. In addition, the size of the panel material is generally 3 shaku wide x 6 shaku long (910 mm wide x 1820 mm long) or 3 shaku wide x 8 shaku long (910 mm wide x 2420 mm long), so a flat, single piece takes up space and is heavy, making it difficult to handle on construction sites and difficult to transport and install.

[0005] Furthermore, even if the paperboard material or the like is impregnated with a fire retardant, if the material becomes too hot, it will eventually burn. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-90235 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned problems with conventional magnetic panels, and has as its object to provide a non-flammable magnetic panel that is lightweight, thin, flexible, can be rolled up compactly, making it easy to handle at construction sites, has excellent transportability and workability, and has reliable non-flammability by suppressing temperature rise. [Means for solving the problem]

[0008] The means adopted by the present inventor to solve the above technical problems will be described below with reference to the accompanying drawings.

[0012] That is The present invention has completed a method for manufacturing a non-flammable magnetic panel by adopting the following technical means: the solid content of a hydrophilic flame retardant is diluted with water to prepare an aqueous solution; the flame retardant is then applied to a paperboard material that has been made into a multi-layer structure by layering and papermaking using a roll that has been immersed in the flame retardant, thereby impregnating the layer; the paperboard material is then dried to leave the solid content of the flame retardant; and then the paperboard material is laminated with a steel plate. Effect of the Invention

[0014] The present invention is constructed by bonding together a steel plate of a thickness that allows magnets to be magnetically attracted and is flexible, and a paperboard material impregnated with a fire retardant. As a result, the product is lightweight, thin, and flexible, and can be rolled up compactly, making it easy to handle at construction sites and providing excellent transportability and workability.

[0015] In other words, because the panel is constructed by bonding together pieces of paperboard, even if a force is applied to bend the panel, the force is distributed and the panel will flex; unlike panel materials made of steel plates alone or laminated with vitreous enamel, which receive force locally and undergo plastic deformation (so-called "breaking"), the panel is extremely easy to handle.

[0016] Furthermore, when cutting the panel with an electric tool such as a circular saw, the elastic vibration of the steel plate can be absorbed and suppressed, allowing for a clean cut and smooth operation.

[0017] Furthermore, the panel can be rolled up to fit within a size of approximately 40cm x 40cm x 90cm, making it possible to pack it into a size that can be handled by courier services, and it can also be loaded into an elevator in an apartment building or other building, eliminating the need to use stairs, making it easy to bring in and transport.

[0018] In addition, since the panel is equipped with a steel plate to which a magnet can be attached, when the non-flammable magnetic panel is installed on a wall base material or the like, a magnet can be magnetically attached to the steel plate, making it possible to use magnets to attach notices and the like to desired locations on the wall, regardless of the location.

[0019] Furthermore, the fire retardant is impregnated into the paperboard, and the heat generation is suppressed by the steel plate guard, so that the temperature rise of the paperboard is suppressed and combustion is prevented, and the panel of the present invention alone can meet the fire retardancy standard without adding other fire retardant materials. Moreover, the swelling amount and swelling rate are smaller than those of the paperboard alone, and warping and deformation of the panel can be prevented. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a partially enlarged perspective view of the nonflammable magnetic panel according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of the present invention will be described with reference to Fig. 1. In the figure, reference numeral 1 denotes a steel plate, and reference numeral 2 denotes a paperboard material.

[0022] The non-combustible magnetic panel of this embodiment is constructed by bonding together a steel plate 1 having a thickness that allows magnets to be magnetically attached thereto and that is flexible, and a paperboard material 2 impregnated with a fire retardant.

[0023] Specifically, the steel plate 1 is 3 shaku wide x 6 shaku long (910 mm wide x 1820 mm long) or 3 shaku wide x 8 shaku long (910 mm wide x 2420 mm long), with a thickness of preferably 0.2 to 0.5 mm (more preferably about 0.3 mm). If it is less than 0.2 mm, the necessary magnetic attraction force cannot be obtained, and if it is more than 0.5 mm, the panel becomes too heavy and difficult to handle, and cutting on site with an electric cutter becomes difficult, impairing workability.

[0024] Moreover, it is preferable to use a hot-dip galvanized steel sheet as the material for the steel sheet 1, which has excellent corrosion resistance, rust prevention, paintability, weldability, formability, workability, etc. The formation of the zinc-plated coating may be performed by normal hot-dip galvanizing, which is processed at high temperatures, or by room-temperature galvanizing, which involves applying a zinc-containing paint.

[0025] The surface of the steel plate 1 (the surface exposed to the interior of the room, opposite the surface to which the paperboard material 2 is attached) may be provided with a decorative layer of paint or decorative film of a thickness that does not impede the magnetic attraction of the magnet.

[0026] In this embodiment, the thickness of the paperboard material 2 is preferably 0.5 to 1.5 mm (more preferably about 1.0 mm). If it is less than 0.5 mm, the necessary strength and rigidity cannot be obtained, and if it is more than 1.5 mm, the flexibility is lost and the panel becomes heavy, impairing handling. In addition, recycled pulp paper, which is inexpensive and is also used for cardboard tubes, etc., can be used as the material for the paperboard material 2.

[0027] In this embodiment, the paperboard material 2 may have a multi-layer structure produced by layering (overlapped layering). Layering is a process in which paper is first made, and then paper stock solution is added and the paper is layered, so that an outer layer adheres to an inner layer previously made, forming a boundary and forming a layer. This papermaking process may be repeated multiple times.

[0028] By making the paperboard material 2 have a multi-layer structure in this way, it has sufficient strength and can allow a small amount of fire retardant to permeate in a short time due to capillary action within the layers.

[0029] In addition, in this embodiment, a hydrophilic liquid agent can be used as the flame retardant to be impregnated into the paperboard material 2. For example, a mixed aqueous solution can be prepared by adding phosphoric acid and a silane coupling agent to an aqueous solution of a metal salt of a weak acid or alkali containing a boron compound, and then adding a plant extract containing a polyphenol compound as a main component to the mixed aqueous solution.

[0030] By using such a fire retardant, it is possible to suppress leaching due to water solubility, and it is possible to allow efficient penetration, and the agent is well fixed to the paperboard material 2, thereby enhancing the fire suppression effect.

[0031] In addition, in this embodiment, if necessary, the surface of the paperboard material 2 can be coated with a water repellent agent to prevent swelling and warping of the components caused by the paperboard material 2 absorbing moisture.

[0032] <Manufacturing method> The method for manufacturing the nonflammable magnetic panel in this embodiment is as follows: First, the paperboard material 2 is processed by applying and impregnating the paperboard material 2 with the fire retardant using a roll that is soaked in the fire retardant.

[0033] The flame retardant can be diluted with water about 8 times to make a 15% aqueous solution, and the solids can remain after drying, so only a small amount of flame retardant can be used. For example, 700 g / m 2 It is possible to leave 1 to 2% of the solid content of the fire retardant in the paperboard material 2. It is also possible to add a penetrating agent (wetting agent) or a surfactant to promote the penetration of the fire retardant.

[0034] A gravure coater or the like can be used as a device for applying the flame retardant using a roll. In this case, by applying the flame retardant by immersing it in a puddle without scraping it off with a doctor blade, a large amount of flame retardant can be adhered to the paperboard material 2 at once, and a sufficient amount can be impregnated even with a single application.

[0035] After drying the paperboard material 2, the paperboard material 2 and the steel plate 1 are bonded together. These are bonded together using an adhesive. For example, urethane-based, epoxy-based, olefin-based, or other adhesives can be used.

[0036] Furthermore, the steel plate 1 and the paperboard material 2 can be continuously bonded together by inserting steel plates 1, which have been formed in advance to a predetermined size (for example, 3 shaku wide x 6 shaku long (910 mm wide x 1820 mm long) or 3 shaku wide x 8 shaku long (910 mm wide x 2420 mm long)), one by one, as the paperboard material 2 is unwound from a roll. Since the steel plate 1 is also thin and flexible, the steel plate 1 and the paperboard material 2 can also be bonded together as they are unwound from their respective rolls. And, as the bonded panel is also about 1.3 mm thick, it can be wound up into a roll and cut to any size for use.

[0037] The present invention is generally configured as described above, but is by no means limited to the illustrated embodiment, and various modifications are possible within the scope of the claims. For example, the material of the paperboard material 2 is not limited to recycled pulp paper, and other paper materials can be used. In addition, the type of fire retardant is as follows: Other hydrophilic liquids can also be employed, and any of these are within the technical scope of the present invention. [Explanation of symbols]

[0038] 10. Non-flammable magnetic panel 1 steel plate 2. Paperboard

Claims

[Claim 1] A method for manufacturing a non-flammable magnetic panel, comprising the steps of: diluting the solid content of a hydrophilic flame retardant with water to prepare an aqueous solution; applying the flame retardant to a paperboard material which has been made into a multi-layer structure by overlapping and papermaking using a roll soaked in the flame retardant, thereby impregnating the layer; drying the paperboard material to leave the solid content of the flame retardant; and then laminating the paperboard material to a steel plate.

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