JP2005254544A - Decorative plate and storage using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative plate which is light in weight and excellent in processability, does not influence a magnetic field on the periphery, and can magnetically attract a commercial magnet sheet, etc. <P>SOLUTION: In the decorative plate 5, a magnetic layer 2 made of a soft magnetic material 21 and a resin 22 is formed on at least one side of a substrate 1, an adhesive 3 is applied on the magnetic layer 2, and decorative paper is set as a decorative layer 4. The thickness of the magnetic layer 2 is 250-400 μm, and the content of the magnetic material 21 in the magnetic layer 2 is 80-90 wt.%. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a decorative board capable of magnetically adsorbing a commercially available magnet sheet or the like without being affected by a magnetic field around it.

  In general, wooden interior boards such as particle board and medium density fiberboard (MDF) have become mainstream materials for housing interior materials such as wooden furniture, kitchens, and storages due to demands for weight reduction of the members. . Then, a decorative sheet such as decorative paper is bonded to these members or a urethane resin is applied to provide a decorative sheet.

  Moreover, when using as a door of a kitchen etc., since nonflammability is requested | required, inorganic things, such as a calcium-silicate board, are used as a base material of a decorative board.

  By the way, it is often necessary to attach a relatively light sheet material such as a memo or a leaflet to a kitchen or storage. In such a case, a decorative board made of a woody or inorganic base material as described above cannot be magnetically adsorbed with a memo or accessory sandwiched between magnets or magnet sheets. Inconvenience that it can only be attached to limited places such as refrigerators and microwave ovens.

  Of course, it is possible to apply a sticker such as cellophane tape to a decorative board made of a wooden or inorganic base material. When the adhesive material is prepared or peeled after being applied, there is a problem that the adhesive agent remains on the surface of the decorative board or the cosmetic material is peeled off and damaged.

  Thus, it is conceivable to attach an iron plate, iron stool, etc. to the base material of the decorative plate. However, in the case of an iron plate, the decorative plate becomes heavy so that it is inconvenient to handle and difficult to process. In addition, when attaching an iron board, a sharp iron board end may be exposed on the processed surface of the decorative plate, and there is a risk of injury to the operator.

  In order to solve such problems, a wall surface decorative sheet that is excellent in workability and workability and has no influence of a magnetic field on the surrounding environment has been proposed (see, for example, Patent Document 1). According to this sheet material, for example, a magnetic layer containing a soft magnetic material is provided on the entire surface of one side of a sheet-like base material such as a synthetic resin sheet, a foamed synthetic resin sheet, paper, cloth, etc. A wall board is obtained by bonding to a wall substrate.

  However, for example, in the case of decorative paper for a decorative board, various miscellaneous patterns of decorative paper are adopted according to the preference of the person and are affixed to the required building materials. However, the magnetic adsorption function is not necessarily required. For this reason, a magnetic paint is applied to the decorative paper as necessary. In such a case, there is a risk that the surface of the decorative paper is contaminated in the magnetic paint application process. Since the magnetic paint is generally black, even a slight stain is noticeable when it adheres to the decorative paper surface, resulting in a defective product. There is also a decorative board that does not attach decorative paper, such as a decorative board made of urethane.

  Therefore, in a decorative board having a function of magnetic adsorption, it is useful to apply a magnetic paint to a substrate used for the decorative board. In this case, the adhesive is applied to the magnetic layer provided on the base material and the decorative paper is bonded, but as described above, there are various types of decorative paper, and the thickness thereof is 10. When the decorative sheet is thick and has a decorative layer of thick decorative paper or urethane coating, the magnetic attraction force is reduced because the distance from the decorative plate surface to the magnetic layer is increased.

  At this time, if a relatively strong magnet is used, no particular problem occurs. For example, various commercially available magnet sheets such as Mac-351, 300, 301, 310, 320, 330, 364 (KOKUYO Office Supplies Industry ( Etc.), etc., there is a problem that even memos and small articles cannot be retained sufficiently.

Therefore, it is conceivable to increase the film thickness of the magnetic paint used to substantially increase the content of the magnetic material. However, immediately after applying the magnetic paint to the substrate, it is dried and immediately applied with an adhesive. When a decorative paper is provided or a decorative layer such as urethane coating is provided, the thick magnetic paint foams, causing irregularities due to the foaming of the magnetic layer on the decorative paper or the decorative layer and causing product defects. Become. Moreover, productivity is significantly reduced under mild drying conditions in which the magnetic coating does not foam.
JP-A-11-272217 (Claims, paragraphs [0028] to [0036])

  A problem to be solved by the present invention is a decorative board that is lightweight and excellent in workability, does not have an influence of a magnetic field on its periphery, and can magnetically adsorb a commercially available magnet sheet or the like The object is to provide storage using a decorative board.

  The present invention provides a decorative plate in which a magnetic layer made of a soft magnetic material and a resin is provided on at least one surface of a base material, and a decorative layer is provided on the magnetic layer, and the thickness of the magnetic layer is 250 to 400 μm, And the content rate of this soft magnetic material in this magnetic layer is 80 to 90 weight%, The decorative board characterized by the above-mentioned is provided. Furthermore, the present invention provides storage using the decorative board.

  According to the decorative board according to the present invention, the magnetic paint is applied, so that it is lightweight and excellent in workability, and the magnetic paint itself is not magnetized, so that the surroundings may be affected by a magnetic field. In addition, since a commercially available magnet sheet or the like can be magnetically adsorbed, if this decorative plate is used for a storage door such as a kitchen, a memo or small object can be easily sandwiched and held.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of a decorative board according to the present invention, in which a magnetic coating is applied to one side of a substrate 1 and dried to form a magnetic layer 2. Further, an adhesive 3 is applied to the magnetic layer 2, and decorative paper is laminated as the decorative layer 4 to form a decorative board 5.

  FIG. 2 is a schematic cross-sectional view showing another embodiment of the decorative board according to the present invention. A magnetic paint is applied to one side of the substrate 1 and dried to form the magnetic layer 2, and then the decorative layer 4. A colored urethane paint is applied to make a decorative board 5.

  In any of the above embodiments, the magnetic layer 2 is composed of the soft magnetic material 21 and the resin 22. The magnetic paint used to form such a magnetic layer 2 contains at least a soft magnetic material 21 and a resin 22 for binding the soft magnetic material 21, and if necessary, a dispersant, a surfactant, and a curing agent. , Plasticizer, antistatic agent, lubricant, abrasive, pigment, organic solvent and the like.

  The soft magnetic material 21 used for the magnetic coating has a coercive force of 4 kA / m or less, such as Ni-Zn ferrite, Mn-Zn ferrite, Cu-Zn ferrite, Cu-Zn-Mg ferrite, Mg-Fe ferrite, etc. Ferrite powder, metal alloy powder such as Fe-Al alloy, Sendust, Permalloy, Fe-Si alloy, and amorphous alloys such as Co-Fe-Si-B, Co-Zr-Nb, Co-Zr-Ta Can be used as a soft magnetic material, but among these, Sendust, Permalloy powder, or amorphous alloy powder is most preferable from the viewpoint of manufacturing cost and easy preparation to a magnetic paint, and if necessary, these Two or more kinds can be appropriately mixed and used.

  Sendust is Fe-Si-Al alloy or Fe-Si-Al-α alloy (α is at least one of Cr, Ti and Cu), and permalloy is Ni-Fe. An alloy or a Ni-Fe-β alloy (β includes at least one of Mo, Cu, Cr, Mn, Nb, and Ta).

  Examples of the resin 22 for dispersing and bonding the powder of the soft magnetic material 21 include polyurethane resins such as polyester polyurethane resin, polyurethane polyether resin, and polyurethane polyol resin, nitrocellulose, cellulose acetate butyrate, ethyl cellulose, and the like. Cellulose derivatives, vinyl chloride, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate-acrylic acid copolymers, etc., vinyl chloride resins, polyester resins, Acrylic resin such as acrylic ester-acrylonitrile copolymer, acrylic ester-styrene copolymer, acrylic ester-vinylidene chloride copolymer, methacrylic ester-styrene copolymer, polystyrene resin, Carboxymethyl resins, polyvinyl butyral resins, polyvinyl acetal resins, epoxy resins, polyamide resins, there are synthetic rubber-based resin, it can be used by mixing them with one or two or more types as appropriate.

  Here, the amount used in the magnetic coating material when dispersing the soft magnetic powder is the weight so that the content is 80 to 90% by weight in the dried magnetic layer 2. If it is 80% by weight or less, sufficient magnetic adsorption cannot be performed on a weak magnetic material such as a commercially available magnet sheet, and even if a memo or small object is sandwiched and held, it tends to fall. Because. Further, if the content is 90% by weight or more, it is difficult to form a magnetic paint, and an appropriate viscosity cannot be obtained even in the coating process.

  Moreover, as a film thickness of the magnetic layer 2 after drying, it is also a weight to set it as the range of 250-400 micrometers, and the range of 280-370 micrometers is especially preferable. This is because when the film thickness is less than 250 μm, a sufficient magnetic attractive force cannot be obtained for a weak magnetic material such as a commercially available magnet sheet, as described above.

  On the other hand, in the normal case, when the decorative board 5 is manufactured, the decorative layer 4 is provided immediately after the adhesive or the like is applied on the substrate 1, so that the magnetic layer 2 is thicker than 400 μm. In this case, when the magnetic coating material is dried, a large number of irregularities are generated on the surface of the magnetic layer 2 due to foaming due to evaporation of a solvent or the like. Will be significantly impaired.

  Therefore, in order to provide the decorative layer 4 immediately after forming the magnetic layer 2 as described above, it is important to set the film thickness to 400 μm or less. If the base material 1 is a wood particle board, medium density fiber board (MDF) or the like, the solvent in the magnetic paint is easily removed from the base material 1 side during drying. The occurrence of the unevenness can be reduced. Moreover, even if it is an inorganic type base material used for a nonflammable decorative board, since it is a porous material, the solvent in a magnetic coating material will come off from the base material 1 side easily during drying.

  After the magnetic paint is dried, the magnetic layer 2 is substantially composed of the soft magnetic material 21 and the resin 22 by the above-described component blending.

  Various types of mixing, kneading, and dispersing machines can be used for preparing the magnetic coating. For example, a two-roll mill, a three-roll mill, a ball mill, a sand mill, a Henschel mixer, a planetary mixer, a pressure kneader, an extruder, an attritor, and a high-speed mixer can be used.

  Examples of methods for applying the magnetic paint to the substrate 1 include gravure coating, gravure reverse coating, reverse roll coating, roll coating, die coating, wire bar coating, doctor blade coating, dip coating, air knife coating, kiss coating, Examples thereof include slot coating and spray coating.

  By using the decorative plate thus obtained for a storage body such as a kitchen or a cabinet, or a door thereof, it is possible to provide storage that can easily hold a memo or an accessory.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.
(Example 1)
Sendag powder (powder composition: Al 5%, Si 10%, Fe 85%, powder shape: amorphous, average particle size 30 μm) 100 parts by weight, “VAGH” (made by Union Carbide, USA) as vinyl chloride-vinyl acetate copolymer resin ) 10 parts by weight, "T-5206" (Dainippon Ink & Chemicals, Inc.) as polyester polyurethane resin, 40 parts by weight toluene, 40 parts by weight methyl ethyl ketone, and 40 parts by weight cyclohexanone as organic solvents in a ball mill The magnetic coating material A containing the soft magnetic material was obtained by dispersing and mixing for 24 hours (the content of the soft magnetic material in the dried magnetic layer 2 was about 83%).

  A particle board of 600 mm × 600 mm × 6 mm is prepared as the base material 1, and the magnetic coating material A is applied to the base material 1 with a roll coater so that the dry film thickness is 300 μm, and hot air is heated at 80 ° C. for 20 minutes. The magnetic layer 2 was formed by drying. Immediately thereafter, 60 μm of adhesive was applied, and a decorative paper having a thickness of 40 μm was bonded as a decorative layer to obtain a decorative board a.

(Comparative Example 1)
A decorative board b was obtained in the same manner as in Example 1 except that the magnetic paint A was applied so that the dry film thickness was 200 μm.

(Comparative Example 2)
A decorative board c was obtained in the same manner as in Example 1 except that the magnetic coating A was applied so that the dry film thickness was 500 μm, but the unevenness on the surface of the magnetic layer 2 was reflected on the decorative paper and was beautiful. The surface of the decorative paper was not obtained.

(Comparative Example 3)
Example 1 except that 100 parts by weight of Sendust powder, 20 parts by weight of “VAGH” as the vinyl chloride-vinyl acetate copolymer resin, and 20 parts by weight of “T-5206” as the polyester polyurethane resin were used. The magnetic coating material B was obtained (the content of the soft magnetic material in the magnetic layer 2 after drying was about 71%).

  A decorative board d was obtained in the same manner as in Example 1 except that the magnetic paint B was applied so that the dry film thickness was 350 μm. The reason for this film thickness is that the total amount of the soft magnetic material in the magnetic layer 2 of the decorative board a in Example 1 is almost the same.

(Retention test using magnet sheet)
As a magnet sheet, a magnet tape of Mac-351 (manufactured by KOKUYO Office Supplies Industry Co., Ltd.) cut to a size of 20 mm × 160 mm × 1.2 mm is prepared and applied to the center part of A4 size paper. It was tested whether it can hold | maintain to the decorative board a, b, d. As a result, in the decorative board a, even if the A4 size copy paper is separated from the decorative board, the magnet sheet does not fall and holds the paper by magnetic adsorption. However, in the decorative boards b and d, the paper is removed from the decorative board. When trying to leave, it fell off to the magnetic sheet.

The schematic cross section which shows one Embodiment of the decorative board of this invention. The schematic cross section which shows other embodiment of the decorative board of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic layer 3 Adhesive 4 Cosmetic layer 5 Decorative board

Claims (3)

In a decorative board in which a magnetic layer made of a soft magnetic material and a resin is provided on at least one surface of a base material, and a decorative layer is provided on the magnetic layer, the magnetic layer has a thickness of 250 to 400 μm, and A decorative board, wherein the content of the soft magnetic material in the magnetic layer is 80 to 90% by weight. The decorative plate according to claim 1, wherein the soft magnetic material is selected from Sendust, Permalloy, and amorphous alloy. Storage using the decorative board according to claim 1 or 2.

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