JP2007077729A - Magnetic coating flooring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic coating flooring method wherein metallic particles having sizes of 10 μm or smaller produced in various processes and floating in the air are attracted and inhibited from floating again, in a manufacturing site of electric products and transportation products, and a magnetic coating flooring method capable of obtaining a floor having a floor face with an excellent abrasion resistance prevented from being damaged, deformed into a rugged surface or scratched even if a lift truck, an automatic traveling robot or the like travels in a factory. <P>SOLUTION: An undercoating comprising a two-pack type epoxy resin is coated on a floor surface, and a magnetic sheet comprising a magnetic material with a filling factor of 80-95% is laid on the top face of the undercoating. A top coating comprising a polyisocyanate component and a polyol component is coated on the top face of the magnetic sheet. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flooring method for obtaining a floor that does not re-float by adsorbing metal powder floating in the air, and more particularly to a magnetic coated flooring method for obtaining a floor having a magnetic force having excellent friction resistance. .

  Metal powder may be generated from various processes in the manufacturing site of electrical products and transportation products. There are metal powders that are small enough to float in the atmosphere, and these powders are mixed in or attached to products in various processes. Such products should be avoided because they cause inconveniences such as a high defect rate and poor appearance. Usually, a product that causes a serious problem when such impurities are attached is prepared and manufactured in a clean room, such as in a clean room, but this requires enormous costs. Even in a process that is not so precise that a clean room must be prepared, it is necessary to avoid contamination and adhesion of metal powder.

  In order to avoid such a state, it is devised to give the floor a magnetic force. Since the magnetic force itself is very weak, it is not effective to attract and adsorb all the metal powder in the atmosphere, but it does not adsorb the metal powder that has fallen down due to gravity or the metal powder in the vicinity of the floor, and will not rise again. As a simple method for preventing the metal powder from floating, it is sufficiently effective.

Using this technique, for example, it is considered as a simplest method to stick a known magnetic sheet to the floor as in Patent Document 1, but a forklift or an automatic traveling robot that travels in a factory is on top of that. If it passes, damage such as peeling or tearing of the magnetic sheet occurs. In addition, when an organic solvent or the like drips down, a problem such as melting of the magnetic sheet occurs. For this reason, frequent maintenance of the floor surface is necessary, and the production process must be stopped each time, and costs have been incurred.
Japanese Patent Laid-Open No. 2005-146689

  In addition, a method of kneading ferrite powder etc. in the floor coating agent applied to the floor, applying it to the floor, and magnetizing it after curing and curing can be considered, but the filling rate of ferrite powder cannot be increased. Also, the magnetic force cannot be made uniform.

  The present invention relates to a floor that does not have the above-mentioned drawbacks and does not adsorb metal powder and cause it to rise again.

  That is, in the present invention, a primer made of a two-component reaction type epoxy resin is applied to the floor surface, and a magnetic sheet having a magnetic material filling rate of 80% to 95% is laid on the upper surface of the primer. The present invention relates to a magnetic coating floor method characterized in that a top coating comprising a polyisocyanate component and a polyol component is applied to the upper surface.

  The present invention is described in detail below. The floor construction method of the present invention is applied to a cement hardened material such as mortar that is an existing floor, or a floor on which a floor material such as an epoxy resin or a urethane resin is already coated. First, the stain | pollution | contamination etc. which adhered to the base coating film surface of a floor surface are machine-polished. At this time, it is preferable to remove partially when the base coating film is peeling or cracked.

  Next, an undercoat made of a two-component reaction type epoxy resin is applied. The undercoat of the present invention is a two-component reactive epoxy resin adhesive comprising at least an epoxy resin, a curing agent, and an inorganic filler. The undercoat has good adhesion to magnetic sheets in addition to good adhesion to epoxy-coated flooring and hardened cements such as concrete and mortar.

  Examples of the epoxy resin used in the present invention include epoxy resins such as glycidyl ether type, glycidyl ester type, and linear aliphatic epoxy side type. In order to impart flexibility, a rubber-modified epoxy resin or a urethane-modified epoxy resin may be blended with the epoxy resin.

  As the curing agent, polyamidoamines, aliphatic and aromatic polyamines, and further modified products thereof are used. It is also possible to use a curing accelerator if necessary. Examples of the curing accelerator include phenols such as phenol and cresol, and tertiary amines such as N, N′-dimethylpiperazine and 2,4,6-tris (dimethylaminomethyl) phenol. When such a curing agent is used, it can be cured at room temperature by mixing two liquids that were separately packed before use, immediately before use.

  Next, a magnetic sheet is laid on the upper surface of the primer. The magnetic sheet is a magnetic sheet having a magnetic material filling rate of 80% to 95%. The magnetic sheet is obtained by kneading and molding a magnetic material and a synthetic resin material. Examples of magnetic materials include ferrites such as Ba ferrite and Sr ferrite, manganese / aluminum, samarium / cobalt, neodymium / iron / boron, and samarium / iron / nitrogen. It is selected in the range of 5 to 100 μm. These magnetic materials may be used alone or in combination of two or more.

  Synthetic resin materials used for the magnetic sheet include, for example, polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, fluorine resin, polymethyl methacrylate, polyacrylonitrile, polyacrylamide, alkyd resin, unsaturated polyester resin, polyethylene terephthalate. , Polybutylene terephthalate, polycarbonate, polyphenylene oxide, polyimide, polyamide, polyphenylene sulfide, polysulfone, silicone resin, phenol resin, urea resin, melamine resin, polyurethane, epoxy resin, polyacetal, polyether resin, and the like.

  The magnetic material and the synthetic resin material are kneaded and formed into a sheet by molding such as extrusion molding, calender molding, injection molding, or coating by dilution with an organic solvent. The magnetic material is 80% to 95% by weight in the entire composition. If it is less than 80%, the magnetic force will be weak, and if it is more than 95%, the strength of the magnetic sheet will be weak, and if a heavy article passes over it, it will be damaged.

  The magnetic sheet may be long, but is not necessarily long. For example, it may be shaped like a 45 × 45 cm or 50 × 50 cm floor tile. Rather, it is preferable to use a floor tile in terms of manufacturing cost and handling.

  A magnetic sheet is laid side by side on the top surface of the primer. At this time, it must be laid before the primer is cured, that is, when it is uncured. By laying before curing, the primer can serve as an adhesive for the magnetic sheet, and construction is easy. In addition, when the end portions of the magnetic sheets overlap, unevenness is generated on the floor surface due to the thickness of the magnetic sheet. Even if there are some gaps, there is no particular problem because it is filled with the top coat described later.

  A commercially available magnetic sheet can be used. When the magnetic sheet has a surface magnetized on the front and back sides and a non-magnetized surface, the magnetic sheet is arranged so that the magnetized surface is the upper side and the non-magnetized surface is the floor surface.

  Next, a top coat is applied to the upper surface of the magnetic sheet. The topcoat material used in the present invention is a coating composition having a polyisocyanate component and a polyol component as main resin components, and is a two-component resin. Polymerized by urethane reaction of isocyanate group and hydroxyl group, or urea reaction of isocyanate group and moisture, becomes a flexible and tough cured product.

  As an isocyanate component, various things used for manufacture of a normal polyurethane resin are illustrated. Specifically, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, phenylene diisocyanate, xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, naphthalene-1,5-diisocyanate, and hydrogenation thereof. Compound, ethylene diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 1-methyl-2,4-diisocyanate cyclohexane, 1-methyl-2,6-diisocyanate cyclohexane, dicyclohexylmethane diisocyanate, triphenylmethanetri An isocyanate etc. are mentioned. These may be used alone or in combination of two or more.

  Examples of the polyol component include polyether polyol, polyester polyol, and carbonate diol. Examples of the polyether polyol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol and 1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl glycol, cyclohexane. A compound obtained by adding ethylene oxide or propylene oxide to dimethanol, 2,2-bis (4-hydroxycyclohexyl) propane, bisphenol A, or the like can be used.

  The polyester polyol can be obtained by reacting an alcohol component with an acid component. For example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and 1,3-butylene glycol, 1,4-butylene glycol, 1,6- Hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, 2,2-bis (4-hydroxycyclohexyl) propane, bisphenol A, etc. added with ethylene oxide or propylene oxide, or ε-caprolactone added A compound or the like can be used as an alcohol component, and a dibasic acid such as adipic acid, sebacic acid, azelaic acid, or dodecanedicarboxylic acid and its anhydride can be used as the acid component. A compound obtained by reacting the above-mentioned alcohol component, acid component and ε-caprolactone at the same time can also be used as the polyester polyol. In addition, a dimer or higher oxycarboxylic acid oligomer in which only carboxylic acids having an OH group such as hydroxylated fatty acids are condensed, or a dimer in which a carboxylic acid having an OH group and a carboxylic acid not having an OH group are condensed. Polyester polyol obtained by reacting the above oxycarboxylic acid oligomer and the above-described polyol component can also be used.

  The carbonate diol is, for example, diaryl carbonate such as diphenyl carbonate, bis-chlorophenyl carbonate, dinaphthyl carbonate, phenyl-toluyl-carbonate, phenyl-chlorophenyl-carbonate, 2-tolyl-4-tolyl-carbonate, dimethyl carbonate, and diethyl carbonate. Carbonates or dialkyl carbonates and diols such as 1,6-hexanediol, neopentyl glycol, 1,4-butanediol, 1,8-octanediol, 1,4-cyclohexanedimethanol, 2-methylpropanediol, di Dipropylene such as propylene glycol, dibutylene glycol or the above diol compounds and oxalic acid, malonic acid, succinic acid, adipic acid, azelaic acid, hexahydrophthalic acid, etc. The reaction product of carbon acids, or can be obtained by transesterification of the polyester diol is the reaction product of ε- caprolactone. The carbonate diol thus obtained is a monocarbonate diol having one carbonate structure in the molecule or a polycarbonate diol having two or more carbonate structures in the molecule.

  The aforementioned polyol may be pre-reacted with the aforementioned isocyanate component in advance to form a urethane oligomer having a hydroxyl group in the molecule. In addition, for the reaction between the isocyanate component and the polyol component, a metal catalyst such as dibutyltin dilaurate, dioctyltin laurate, zinc octylate or an organic bismuth compound, or an amine catalyst such as triethylenediamine or morpholine amine is used. be able to.

  The topcoat of the present invention is preferably applied after the undercoat is cured to such an extent that it does not have fluidity. The top coat can be applied with a spatula, a trowel, a roller or the like. Curing is performed after the top coat is applied, and the top coat is cured.

  The present invention is capable of adsorbing metal powder generated from various processes at the production site of electrical products and transportation products. The metal powder once adsorbed is not resuspended, but the mixing rate into the product is reduced. Further, even if a forklift or an automatic traveling robot travels in the factory, the floor surface is not destroyed, unevenness or scratches do not occur.

A-1 two-component reactive type epoxy resin (Three Bond's Three Longy F-377) was applied at a rate of 0.2 kg / m ² as a primer on a floor made of epoxy resin on a concrete mortar floor. did. The magnetic sheet was affixed before the primer was cured. The magnetic sheet had a magnetic surface on the top and a nonmagnetic surface on the floor. In order to prevent air from being mixed between the undercoat and the magnetic sheet, pressure was applied from above the magnetic sheet with a roller to perform pressure bonding while removing the air.

After curing for 12 hours, as a top coat, a two-component reactive urethane resin (Three Bond U-600 made by Three Bond) consisting of a B-1 isocyanate component and a polyol component is uniformly applied with a rubber spatula at a rate of 1.0 kg / m ^2. Worked. Cured for 24 hours.

  As a comparative test, A-2 urethane resin (Three Bondy U-500 made by Three Bond), A-3 acrylic resin (fast mole primer made by Asahi Bond), A-4 one-component acrylic emulsion resin instead of the above-mentioned primer. (Three Bond Three Longy A-210) was used.

  As a comparative test, B-2 methyl methacrylate resin-coated flooring (R71 made by Mitsui Chemicals), B-3 epoxy resin-coated flooring (Three Bond Three Longy F-320) instead of the above-mentioned topcoat , B-4 vinyl ester resin-coated flooring (JOLIETH JE-2110 manufactured by Aika Industry) was used.

  The process of running at 10 km / m / h with a forklift (GENEO 1t car manufactured by Toyota Industries Co., Ltd.) and applying a brake was repeated on the floor constructed with each of the above combinations. The operation was performed 10 times, and the surface condition was examined. The test results are shown in the table. However, A in the table indicates that there is no abnormality on the coating film surface, B indicates that cracks have occurred on the coating film surface, but the magnetic sheet does not peel, C indicates that cracks have occurred on the coating film surface, and the magnetic sheet. And the floor surface is the one where the peeled part occurs.

From the results, those using A-2 urethane resin, A-3 acrylic resin, and A-4 one-component acrylic emulsion resin as the undercoat may cause peeling of the floor surface and the magnetic sheet, and the coating surface Cracks occurred. Also, cracks occurred on the coating film surface using B-2 methyl methacrylate resin-coated flooring, B-3 epoxy resin-coated flooring, and B-4 vinyl ester resin-coated flooring as the top coat. Further, if the topcoat and undercoat are not combined in the present invention, surface cracks and peeling of the magnetic sheet occur, and it has been proved that only the combination of the present invention is effective.

The present invention is applied to a manufacturing factory.

Claims (1)

An undercoat made of a two-component reactive epoxy resin is applied to the floor, a magnetic sheet with a magnetic material filling rate of 80% to 95% is laid on the upper surface of the undercoat, and a polyisocyanate component is further formed on the upper surface of the magnetic sheet. A magnetic coating floor method characterized by applying a top coat comprising a polyol and a polyol component.