JP2019085837A - Repair method - Google Patents

Abstract

To provide an efficient method capable of reducing labor and time in repairing a coating having heat resistant protection.SOLUTION: A solid piece containing 200 to 1000 pts.wt. of a heat-resistance imparting powder is pressed using a pressing tool in a heated state with respect to 100 pts.wt. of a thermoplastic resin having a melting temperature of 90°C or less in the recess where the coating with high temperature protection should be repaired, and the solid pieces are filled in the recess.SELECTED DRAWING: None

Description

  The present invention relates to a novel repair method.

  Heretofore, various coating materials have been proposed for forming a carbonized heat insulating layer by foaming due to a temperature rise at the time of fire or the like for the purpose of protecting a base material such as steel material, concrete, wood or synthetic resin from fire. As such a covering material, what mix | blended the heat resistance imparting powder etc. with synthetic resin is known. Such a covering material is applied to the surface of the substrate to be protected to form a coating having heat resistant protection. Furthermore, on the surface of such a film, a cosmetic film etc. may be provided for the purpose of the aesthetics improvement etc.

  However, in the case of film formation as described above, when problems such as swelling, peeling, cracking, chipping, etc. occur due to various conditions (construction conditions, environmental conditions, etc.) at the time of film formation or after formation or physical damage. Needs to repair the coating. For example, Patent Literature 1 (Japanese Unexamined Patent Publication No. 2011-136288) describes a specific repair method using an undercoat paint, a thermally foamable paint, and the like.

JP 2011-136288 A

  However, in the repair method as described in the above-mentioned patent documents, it is necessary to apply the foamable paint over the concave portion of the film to be repaired a plurality of times, and it takes a certain amount of labor and time to complete the repair.

  The present invention has been made in view of these points, and it is an object of the present invention to provide an efficient method capable of reducing labor and time in repairing a film having heat resistant protective properties. .

  In order to solve such problems, as a result of intensive investigations, the inventor of the present invention has conceived of a repair method using a specific solid piece, and has completed the present invention.

That is, the present invention has the following features.
1. A method of repairing a coating having heat resistant protection properties, comprising:
In the recess where the coating should be repaired,
A solid piece containing 200 to 1000 parts by weight of the heat resistance imparting powder with respect to 100 parts by weight of a thermoplastic resin having a melting temperature of 90 ° C. or less is pressed with a pressing tool in a heated state,
A repair method comprising: filling the solid piece in the recess.
2. The solid pieces are heated to a temperature of 100 ° C. or less. Repair method described.

  ADVANTAGE OF THE INVENTION According to this invention, when repairing the film which has heat-resistant protective property, time and effort can be reduced and repair can be performed efficiently.

  Hereinafter, modes for carrying out the present invention will be described.

  The present invention is a method of repairing a film having heat resistant protection, in which a specific solid piece is filled in a recess (hereinafter, also simply referred to as a "recess") in which the film is to be repaired.

  The coating to be subjected to the repair method of the present invention has heat resistant protection. Specifically, it has the ability to protect the substrate from high heat such as fire. Such a film is foamed by a temperature rise at the time of fire or the like (preferably when the film surface temperature is 200 ° C. or more, more preferably 250 ° C. or more) to form a carbonized heat insulation layer, and the substrate is heated from high heat. Protect.

  As a base material, the various base materials which constitute various parts, such as a wall, a pillar, a floor, a beam, a roof, a stairs, a ceiling, a door, are mentioned, for example. As a material which comprises such a base material, steel materials, metal, concrete, mortar, siding board, a tile, a brick, glass, wood, a synthetic resin, a plastics, rubber etc. are mentioned, for example. These substrates are those on which a film (antirust film, undercoat film, topcoat film, etc.) has already been formed on the surface, or some surface treatment (antirust treatment, flame retardant treatment, etc.) has been applied, etc. May be

  As a film having heat resistance protection property, for example, a resin, and a coating material (heat foamable paint etc.) containing a heat resistance imparting powder such as a foaming agent, a carbonizing agent, a flame retardant and a filler Etc.

  Examples of the resin include acrylic resin, vinyl acetate resin, vinyl acetate-acrylic copolymer resin, polyethylene resin, acrylic-styrene copolymer resin, vinyl acetate-ethylene copolymer resin, polyester resin, vinyl acetate-versatric acid vinyl ester copolymer Polymer resin, vinyl acetate-versaic acid vinyl ester-acrylic copolymer resin, phenol resin, petroleum resin, vinyl chloride resin, epoxy resin, urethane resin, urethane resin, polybutadiene resin, alkyd resin, melamine resin, fluorine resin, propylene rubber, chloroprene rubber, Butyl rubber, isobutylene rubber and the like can be mentioned. These can be used alone or in combination of two or more.

  Examples of the foaming agent include expandable graphite; melamine and its derivatives, dicyandiamide and its derivatives, nitrogen-containing foaming agents such as azodicarbonamide, urea and thiourea, and the like. These can be used alone or in combination of two or more. Such a foaming agent can impart a foaming action to the film by a temperature rise at the time of fire etc. Specifically, the foaming action can be imparted when the temperature of the film surface is preferably 200 ° C. or higher. It is a thing.

  Examples of the carbonizing agent include pentaerythritol, dipentaerythritol, trimethylolpropane, starch, casein and the like. These can be used alone or in combination of two or more. Such a carbonizing agent can impart an effect of forming a carbonized heat insulating layer by dewatering and carbonizing the above-mentioned resin due to a temperature rise at the time of fire or the like.

  Examples of the flame retardant include organophosphorus compounds such as tricresyl phosphate and diphenyl cresyl phosphate; chlorinated polyphenyl, chlorinated polyethylene, diphenyl chloride, triphenyl chloride, chlorinated paraffin, fatty acid pentachloride ester, and perchlorinated fatty acid ester Chlorinated compounds such as chloropentacyclodecane, chlorinated naphthalene and tetrachlorophthalic anhydride; antimony compounds such as antimony trioxide and antimony pentachloride; phosphorus trichloride, phosphorus pentachloride, ammonium phosphate, ammonium polyphosphate, melamine phosphate, Phosphorus compounds such as melamine polyphosphate, melam polyphosphate, melem polyphosphate, boron phosphate, boron polyphosphate, aluminum phosphate and aluminum polyphosphate; and inorganic compounds such as zinc borate and sodium borate. These can be used alone or in combination of two or more. Such a flame retardant exhibits at least one effect such as a dehydration cooling effect, a nonflammable gas generation effect, a carbonization promoting effect and the like in a high temperature state at the time of fire etc., and can exhibit a resin combustion suppressing action.

  Examples of fillers include carbonates such as calcium carbonate, sodium carbonate, magnesium carbonate and aluminum oxide; metal oxides such as titanium dioxide and zinc oxide; silica, clay, talc, clay, kaolin, diatomaceous earth, shirasu, mica And inorganic powders such as wollastonite, silica sand, silica stone, quartz, vermiculite, alumina, fly ash and the like. These can be used alone or in combination of two or more. Such a filler can exhibit the strength improvement effect and the like of the carbonized heat insulating layer.

  The coating material which forms a film having heat resistant protection includes, in addition to the above components, for example, pigments, fibers, wetting agents, plasticizers, lubricants, preservatives, fungicides, algaecides, antibacterial agents, thickeners, It may contain a leveling agent, a dispersing agent, an antifoaming agent, a crosslinking agent, an ultraviolet light absorber, an antioxidant, a dilution solvent and the like.

  The thickness of the film formed by such a covering material may be appropriately set according to the desired functionality, application site and the like, but is preferably about 0.4 to 5 mm. In the present invention, “a to b” has the same meaning as “a or more and b or less”.

  The film having heat resistant protection may be provided with a cosmetic film or the like on the surface for the purpose of improving the appearance and durability. Such a decorative film can be formed by applying a known topcoat material. Examples of the top coating material include coating materials such as acrylic resin, urethane resin, acrylic silicone resin, and fluorine resin.

  In the present invention, when the above-mentioned coating has a defect (for example, swelling, floating, 剝 cracking, chipping, etc.), the coating is repaired. It is desirable to partially remove the coating of the defective portion and the vicinity thereof prior to the repair with respect to the defective portion such as swelling and lifting. This forms a recess to be repaired. 剝 In the case of defects such as cracks, cracks, etc., in many cases, a recess is formed at the time of occurrence of the defect, but by partially removing the film in the vicinity of the defect, repair can be performed. The shape of the recess to be formed can also be adjusted.

  The shape of the recess to be repaired (the shape when the coating film is viewed from the front) is not particularly limited and may be indeterminate. For example, the shape may be circular, oval, triangular, square, strip The work efficiency can be enhanced by arranging the shape to approximate to these. The size of such a recess (the length in the short direction when the film is viewed from the front) is preferably 5 to 300 mm, more preferably 10 to 100 mm. The depth of the recess is preferably 0.3 to 10 mm, more preferably 0.5 to 6 mm.

  In the present invention, such recesses are filled with specific solid pieces. As the solid small pieces, those containing 200 to 1000 parts by weight of the heat resistance imparting powder with respect to 100 parts by weight of the thermoplastic resin having a melting temperature of 90 ° C. or less are used. In the present invention, by using such solid pieces, pressing work can be performed efficiently at a relatively low temperature, adhesion property, finishability, etc. are good, and the time and time required for repair can be reduced. Can. When pressing the solid small pieces, the solid small pieces can be pressed directly by using a pressing tool, and various functional sheets (for example, a heat resistant sheet, a mold release, etc. between the solid small pieces and the pressing) It is not necessary to interpose a sheet, a peelable sheet, etc.).

  The thermoplastic resin constituting the solid small pieces has a melting temperature of 90 ° C. or less, preferably 85 ° C. or less, more preferably 80 ° C. or less. When the melting temperature exceeds the above value, it is necessary to perform the pressing operation at a relatively high temperature, and the functional sheet as described above is also required at the time of pressing. The melting temperature is a value measured by the method described in JIS K6924-2 (using a DSC (differential scanning calorimeter)).

  As a thermoplastic resin, various resin which satisfy | fills the said melting temperature can be used. As such a thermoplastic resin, for example, polyester resin, polybutadiene resin, acrylic resin, styrene resin, acrylic styrene resin, vinyl acetate resin, ethylene vinyl acetate resin, vinyl acetate-versadic acid vinyl ester resin, vinyl acetate-versadic acid Examples include vinyl ester-acrylic resin, vinyl acetate-acrylic resin, urethane resin, alkyd resin, fluorine resin, polyethylene resin, vinyl chloride resin, polypropylene resin, polystyrene resin and the like. These can be used alone or in combination of two or more. As a thermoplastic resin, 1 type, or 2 or more types chosen from an acrylic resin, a styrene resin, acrylic styrene resin (acryl-styrene copolymer resin), vinyl acetate resin, ethylene vinyl acetate resin (ethylene-vinyl acetate copolymer resin) Is preferred, and an embodiment comprising at least an ethylene vinyl acetate resin is more preferred.

  Examples of the heat resistance imparting powder in the solid pieces include one or more selected from a foaming agent, a carbonizing agent, a flame retardant, and a filler. As the blowing agent, the carbonizing agent, the flame retardant, and the filler, the same ones as the above-mentioned coating having heat resistant protection can be used. As such a heat resistance imparting powder, an embodiment containing a foaming agent, a carbonizing agent, a flame retardant, and a filler is preferable.

  The ratio of the heat resistance imparting powder in the solid small pieces is 200 to 1000 parts by weight, preferably 250 to 900 parts by weight, and more preferably 300 to 800 parts by weight with respect to 100 parts by weight of the thermoplastic resin. Since the lower limit of the ratio of the heat-resistance imparting powder is the above value, when pressing solid pieces, it is possible to directly press the solid pieces using a pressing tool, and the functional sheet is also unnecessary. . When the upper limit of the ratio of the heat-resistance imparting powder is the above value, adhesion, finish and the like can be sufficiently secured.

  In order to obtain a solid piece, a mixture obtained by uniformly mixing the above-mentioned components may be formed by a known method, and formed into a sheet and then processed into a desired shape (for example, a cutter It is also possible to cut etc.). At the time of mixing of each component, it is also possible to mix and heat a solvent as needed.

  Various additives and the like can be mixed with the above mixture. Additives include, for example, pigments, fibers, wetting agents, plasticizers, lubricants, preservatives, fungicides, algaecides, antibacterial agents, thickeners, leveling agents, dispersants, antifoaming agents, crosslinking agents, UV absorbers, antioxidants, catalysts, etc. may be mentioned.

  As a forming method, for example, a method of pouring the mixture into a mold and removing it after drying, a method of applying the mixture to a release paper by a heating coater and winding it up, extrusion molding of a mixture kneaded by a kneader or the like A method of forming into a sheet by a press machine, a method of supplying a mixture kneaded by a kneader etc between a pair of rolls and forming into a sheet, a method of forming a mixture into a pellet and thereafter forming into a sheet by an extrusion molding machine, Banbury The method of rolling in a mixer or a mixing roll the mixture knead | mixed with a calender which consists of several heat rolls, and shape | molding in a sheet form etc. is mentioned.

  Shape of solid piece (shape when viewed from the front), size (length in the lateral direction when viewed from the front), thickness, etc. are the shape, size, and depth of the recess to be repaired It may be set according to the etc. When unevenness or the like exists in the recess, it is desirable to set the solid piece larger than the recess. The shape of the solid piece may be indeterminate, but for example, if it is arranged in a shape such as a circle, an oval, a triangle, a square, a strip, or a shape similar to these, the working efficiency should be improved. Can. The size of such solid pieces is preferably 5 to 350 mm, more preferably 10 to 120 mm. The thickness of the solid pieces is preferably 0.3 to 10 mm, more preferably 0.5 to 6 mm, still more preferably 0.8 to 3 mm.

  In the present invention, a solid piece is brought into contact with a recess to be repaired, and the solid piece is heated and pressed using a pressing tool. Thereby, the solid piece is filled in the recess to be repaired.

  When heating the solid pieces, the temperature (surface temperature of the solid pieces) is preferably 100 ° C. or less, more preferably 40 to 90 ° C., and still more preferably 45 to 80 ° C. . The heating of the solid pieces may be performed before or after the solid pieces contact the recess. As a means to heat, the method of using a heater, a dryer, a heating iron, a thermostat, etc. is mentioned, for example.

  When pressing the solid piece, the solid piece may be in the state of being warmed as described above. In the present invention, the solid pieces can be pressed while being heated. Examples of the pressing tool include irons, spatulas, rollers, and the like. The material of such a pressing tool may be made of metal, plastic or the like, and metal is particularly preferable.

  In the present invention, the pressing tool can press directly in contact with the solid piece. That is, it is possible to press without using the above-mentioned functional sheet, and it is possible to secure the adhesion, finish and the like.

  When pressing the solid pieces into the recess, it is also possible to stack or align two or more solid pieces as needed. In addition, by repeatedly performing the step of pressing the solid piece with respect to the concave portion at one place, it is possible to make a state in which two or more solid pieces overlap. When pressing the solid piece, the surface of the solid piece may be provided with a concavo-convex pattern or the like by, for example, a roller having a concavo-convex shape, and it may be made compatible with the appearance (texture etc) of the surrounding film.

  After the solid pieces are filled in the recess by such pressing, for example, a cutting process, a polishing process, and the like can be performed on a portion that protrudes from the recess. A thermally foamable paint can also be applied to the surface of the solid pieces or in the vicinity thereof. By such a process, it is also possible to make the appearance (texture etc.) of the repaired portion conform to the surrounding film. At the time of application of the thermally foamable paint, for example, a brush, a roller, a iron, a spray or the like can be used.

  Furthermore, a surface coating material or the like can be applied to the surface (repaired portion) of the solid piece or in the vicinity thereof. By such a process, the finishability is enhanced, the appearance having an excellent appearance can be obtained, and the durability and the like can be enhanced. Examples of the upper coating material include coating materials such as acrylic resin, urethane resin, acrylic silicone resin, and fluorine resin, and may be selected according to the appearance (color tone, gloss, texture, etc.) of the surrounding film. Can.

  The features of the present invention will be made clearer by the following examples and comparative examples.

Example 1
100 parts by weight of thermoplastic resin (ethylene vinyl acetate copolymer resin, melting temperature 64 ° C.), 495 parts by weight of fireproofing powder {60 parts by weight of a foaming agent (melamine), 60 parts by weight of a carbonizing agent (pentaerythritol), flame retardant A mixture of 300 parts by weight of (ammonium polyphosphate) and 75 parts by weight of filler (titanium oxide) is kneaded with a kneader heated at 120 ° C., rolled, allowed to cool to room temperature, and formed into a 1.5 mm-thick sheet I got a body one.

  As a test body, prepare a steel plate coated with an epoxy resin-based rust-preventive primer, an acrylic styrene resin-based thermally foamable paint, an acrylic emulsion paint (white), and a part of the film of this test body. It cut and formed the circular recessed part (diameter 40 mm, depth 3 mm).

  Two pieces of solid pieces obtained by cutting the sheet-like molded body 1 into a circle (diameter 42 mm, thickness 1.5 mm) are heated with a dryer so that the surface temperature of the solid pieces is 65 ° C. It piled up and was in contact with the recess of the body, and the surface of the solid piece was pressed with a metal roller. The ends of the solid pieces which had come out of the recesses were polished with sandpaper. Next, an acrylic emulsion paint (white) was applied to the recess and its vicinity.

  By the above method, the concave portion can be efficiently repaired, and the adhesion and finish of the repaired portion are also good. When the surface of this test body was heated by a burner, the entire coating including the repaired portion was foamed to form a carbonized heat insulating layer, and the heat resistance was also good.

(Example 2)
100 parts by weight of a thermoplastic resin (ethylene vinyl acetate copolymer resin, melting temperature 69 ° C.), 495 parts by weight of fireproofing powder {60 parts by weight of a foaming agent (melamine), 60 parts by weight of a carbonizing agent (pentaerythritol), flame retardant A mixture of 300 parts by weight of (ammonium polyphosphate) and 75 parts by weight of filler (titanium oxide) is kneaded with a kneader heated at 120 ° C., rolled, allowed to cool to room temperature, and formed into a 1.5 mm-thick sheet I got a body 2.

  When the above sheet-like molded body 2 is used instead of the sheet-like molded body 1 and repair is performed by the same method as in Example 1, the concave portion can be efficiently repaired, and the adhesion of the repaired portion, The finish was also good. When the surface of this test body was heated by a burner, the entire coating including the repaired portion was foamed to form a carbonized heat insulating layer, and the heat resistance was also good.

(Example 3)
100 parts by weight of a thermoplastic resin (ethylene-vinyl acetate copolymer resin, melting temperature 75 ° C.), 495 parts by weight of fireproofing powder {60 parts by weight of a foaming agent (melamine), 60 parts by weight of a carbonizing agent (pentaerythritol), flame retardant A mixture of 300 parts by weight of (ammonium polyphosphate) and 75 parts by weight of filler (titanium oxide) is kneaded with a kneader heated at 120 ° C., rolled, allowed to cool to room temperature, and formed into a 1.5 mm-thick sheet I got 3 bodies.

When the above sheet-like molded body 3 is used instead of the sheet-like molded body 1 and repair is performed by the same method as in Example 1, the concave portion can be efficiently repaired, and the adhesion of the repaired portion, The finish was also good. When the surface of this test body was heated by a burner, the entire coating including the repaired portion was foamed to form a carbonized heat insulating layer, and the heat resistance was also good.

Claims (2)

A method of repairing a coating having heat resistant protection properties, comprising:
In the recess where the coating should be repaired,
A solid piece containing 200 to 1000 parts by weight of the heat resistance imparting powder with respect to 100 parts by weight of a thermoplastic resin having a melting temperature of 90 ° C. or less is pressed with a pressing tool in a heated state,
A repair method comprising: filling the solid piece in the recess. The repair method according to claim 1, wherein the solid pieces are heated to 100 ° C. or less.