JP2007009064A - Powdery coating material composition, method for forming coat, and coated product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powdery coating material composition which develops the high deodorizing action and purifying action unobtainable in a liquid coating material that uses a solvent such as water or an organic solvent and which has the excellent coat performance and coatability, to provide a method for forming a coat, and to provide a coated product. <P>SOLUTION: The powdery coating material composition, containing a thermosetting resin, a hardener and a porous calcined matter containing a powdery charcoal and clay, is characterized in that the powdery coating material composition is a blend in a ratio of 100 parts by mass of the sum total of the above thermosetting resin and the above hardener and 10-200 parts by mass of the above porous calcined matter. The method for forming a coat film comprises using this powdered coating material composition. The coated product is a product obtained by this method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a powder coating composition, a coating film forming method, and a coated article that exhibit a high deodorizing action and a high purification action, and further have good coating film performance and paintability.

  In recent years, air conditioning facilities have been enhanced in buildings such as ordinary houses, office buildings, theaters, movie theaters, department stores, and vehicles such as automobiles and trains. Airtightness is improved. For this reason, the occurrence of condensation or mold in poorly ventilated or ventilated parts becomes a problem, or interior materials for buildings such as wall materials, ceiling materials, partition materials, wall cloth materials, vehicles such as cars and trains, etc. Various interior materials and furniture used in human living spaces, such as interior materials for vehicles used in the interior of a car, furniture for furniture, daily necessities, etc. ), Sick house syndrome caused by formaldehyde volatilized from the environment has become a social problem.

  Therefore, conventionally, in order to solve such problems, various paints having a deodorizing function, an air purification function, and a humidity control function for removing various malodors have been studied. For example, Patent Document 1 and Patents As in Document 2, a method has been proposed in which various charcoal components and porous fired products are blended in a liquid coating composition to impart functionalities such as a deodorizing action, an air purification action, and a humidity control action to the paint. .

  In Patent Document 1, a kneaded product of 70 to 90 parts by weight of pulverized charcoal and 10 to 30 parts by weight of clay is molded, and the obtained molded body is fired to prepare a substantially white porous fired product. The powder of the porous fired product obtained by pulverizing the porous fired product to 200 mesh or more, alone or together with charcoal powder such as bamboo charcoal, phenol resin paint or polyvinyl alcohol (specifically, Nippon Synthetic Paints for interior materials such as ceilings, walls, sashes, etc., which can be easily prepared and used in any color tone, in a proportion of 10 to 30 parts by weight in 100 parts by weight of the product name “GOHSENOL” manufactured by the company It is disclosed that it is used as an internal paint, a lighting device, a paint for an electric device such as a refrigerator, a television, a personal computer, or the like.

Patent Document 2 discloses that a kneaded product of a non-moisture permeable water-based emulsion resin having a minimum film forming temperature of −5 ° C. or higher and lower than 20 ° C., pulverized charcoal and an inorganic binder is obtained. 0.5 mm or less and a substantially white porous fired product, and the porous fired product is blended in a proportion of 10 to 50% by mass in the water-based coating composition and the content of the volatile organic compound is By blending at a ratio of 1% by mass or less, a coating composition for interior materials is disclosed that has excellent basic performance as a coating material for interior materials, and also has excellent adsorption performance such as adsorptive to harmful substances and deodorizing properties. ing.
JP 2002-167287 A JP 2004-323795 A

  However, in the paint of Patent Document 1, the kind of paint is not particularly limited, but a general paint such as a phenol resin can be used, and in the examples, polyvinyl acetate obtained by polymerizing vinyl acetate. "GOHSENOL" (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), a water-soluble vinyl resin with a hydroxyl group saponified from, is a liquid paint using water or an organic solvent as a solvent, There is no description of its use as a paint.

  The interior paint composition of Patent Document 2 also uses a non-moisture permeable water-based emulsion resin, but does not describe use as a powder paint.

  As described above, in the paints described in Patent Documents 1 and 2, water or an organic solvent liquid is used as the solvent. Therefore, when the solvent enters the pores of the porous fired product, There is a problem that the function of the fired fired product is not sufficiently exhibited, and the deodorizing action and the purifying action cannot be sufficiently obtained.

  In addition, since it is a liquid paint using water or a solvent of an organic solvent, the porous fired product dispersed in the paint causes secondary agglomeration over time, and a paint containing this secondary agglomerate is used. By painting, the aggregate of porous fired products is unevenly distributed on the surface of the coating, and if the surface of the coating is scratched or rubbed, the agglomeration soul may drop off, or the coating film formed may have a low coating hardness or adhesion. The phenomenon that the nature also falls occurs. In addition, due to the presence of secondary aggregates of porous aggregates in the liquid paint, spray nozzles tend to clog spray nozzles, which is inappropriate for continuous coating on industrial coating lines, etc. There was a problem.

  For these reasons, the object of the present invention is to develop a powder having a high deodorizing action and a high cleaning action that cannot be obtained with a liquid paint using a solvent such as water or an organic solvent, and having good coating film performance and paintability. It is providing the body coating composition, the coating-film formation method, and a coated material.

  In view of the above problems, as a result of intensive studies, the present inventors kneaded thermosetting resin, curing agent, raw material components of powdered coal and clay, molded the kneaded product, By using a powder paint containing a porous fired product obtained by firing, a high deodorizing action and a high purification action that cannot be obtained with a liquid paint using water or an organic solvent, etc. The inventors have found that the coating performance is good and have reached the present invention.

  More specifically, the present invention provides the following powder coating composition, coating film forming method and coated article.

  (1) A powder coating composition containing a thermosetting resin, a curing agent, and a porous fired product containing powdered charcoal and clay, and the total of the thermosetting resin and the curing agent The powder coating composition which mix | blends the said porous baked material in the ratio of 10-200 mass parts with respect to 100 mass parts of quantity.

  According to the present invention, since a porous fired product obtained by molding powdered charcoal using clay as a binder is blended, a high deodorizing action that cannot be obtained with a liquid paint using water or an organic solvent as a solvent, and It is possible to obtain a coated product exhibiting a high purification effect and having good coating film performance and paintability. In other words, the porous fired product generates negative ions, but in order to increase the generation efficiency and increase the effective surface area, the pore diameter range is 1 to 50 nm, and there are many pore diameters of about 10 nm, commonly known as mesopores. However, in liquid paints using solvents such as water or organic solvents, the resin dissolved in the solvent penetrates into the pores of the porous fired product, reducing the effective area and reducing the deodorizing and purifying effects. However, in the powder coating composition of the present invention, the pre-mixing, melt-kneading, pulverization, classification, and filling steps are sequentially performed as the manufacturing process, which is the most effective in determining the distribution state of the resin and the porous fired product. In the melt-kneading process that contributes, the melt viscosity of the resin is relatively high, so there is little penetration into the pores in the porous fired product, so there is little reduction in the effective area, and high deodorizing action and high purification action are manifested. High Erareru. Moreover, since the compounding ratio is 10-200 mass parts with respect to 100 mass parts of total amounts with the said thermosetting resin and the said hardening | curing agent, it is excellent in coating-film performance, such as adhesiveness, hardness, an external appearance. become.

  In addition, since the paint is in the form of powder and does not use a solvent, secondary agglomeration of the porous fired product does not occur unlike a liquid paint using a solvent such as water or an organic solvent.

  Incidentally, the porous fired product is mainly composed of powdered charcoal and viscosity, and other raw material components such as barley stone are appropriately added and kneaded according to the purpose, and the obtained kneaded product is fired, It is obtained by pulverizing this fired product, and has functions such as a deodorizing action, a purifying action, and a humidity control action that the powdered coal has.

  The “deodorizing action” in the present invention means that the porous baked product emits an unpleasant odor that positive ions are charged by increasing the adsorption of odor due to the porous structure of the porous baked product. By contacting with negative ions, the negative ions are adsorbed and the charge is lost. “Purification” means that volatile chemical substances such as formaldehyde and organic solvents that are considered to be charged with positive ions come into contact with the negative ions generated by the porous fired product and adsorb negative ions. It means that the charge disappears.

  (2) The powder coating composition according to (1), wherein the porous fired product is obtained by firing a kneaded product obtained by kneading a raw material composition containing powdered charcoal and clay.

  (3) The use ratio of the powdered charcoal and the clay is such that the powdered charcoal is 70 to 90 parts by mass and the clay is 10 to 30 parts by mass, the powder according to (1) or (2) Paint composition.

  According to the present invention, the porous fired product is substantially white in color because powdered charcoal is covered with clay. Moreover, since there are many powdered charcoal with 70-90 mass parts, it is excellent in functionality, such as a deodorizing effect | action, a purification effect, and a humidity control effect | action.

  (4) Any of (1) to (3) above, wherein the porous fired product further contains at least one selected from the group consisting of powdered barleystone, powdered tourmaline and powdered precious stone as a raw material component. Powder coating composition.

  Since the said barley stone has the purification action of water and air, the purification action with respect to the water and air of a coating film can be improved by containing powdered barley stone. In addition, tourmaline and precious stones have the effect of generating negative ions. In particular, mixing precious stones with a large amount of negative ions produces a synergistic effect of generating negative ions, and negative ions generated by tourmaline and precious stones. Therefore, the generation of negative ions in the coating film can be further enhanced by containing powdered tourmaline and powdered precious stone. Furthermore, a high water and air adsorption effect due to the porous structure of the porous fired product and a synergistic effect of deodorizing action are exhibited by mixing tourmaline and precious stones that generate negative ions. Performances such as deodorization, purification, and humidity control are further enhanced.

  (5) The powder coating composition according to (4), wherein the porous fired product further contains powdered graphite meteorite as a raw material component.

  The graphite meteorite, also called graphite silica, has the ability to generate negative ions and emit far-infrared rays. By containing powdered graphite meteorite, the generation of negative ions and far-infrared emission in the coating can be further enhanced. it can. This further enhances the performance of the coating film such as deodorization, purification, and humidity control.

  (6) The powder coating composition according to (4), wherein the porous fired product further contains powdered shells or powdered corals as a raw material component.

  The above shells and corals serve as extender pigments as natural calcium carbonate, and can reinforce and increase the coating film. The type of the shell is not particularly limited, and common shells such as pearl oysters and crows can be used.

  (7) The powder coating composition according to any one of (1) to (6), wherein the average particle diameter of the porous fired product is in the range of 3 to 100 μm.

  According to the present invention, a smooth and uniform coating film can be obtained without causing any flaws or the like on the coating film due to the porous fired product contained in the powder coating composition. If a porous calcined product with an average particle size of less than 3 μm is blended, classification and poor dispersion are likely to occur, the finish of the coating film becomes crusty, or an aggregate of porous calcined product particles due to poor classification and dispersion is applied. It is not preferable because the film may become uneven, and if it exceeds 100 μm, unevenness of the porous fired particles is generated in the thin film portion of the coating, and it is difficult to obtain a smooth and uniform matte coating surface. It is not preferable. In addition, the average particle diameter in this invention shows a volume average particle diameter (average diameter weighted with the volume).

  (8) The powder coating composition according to any one of (1) to (7), wherein the powder coating composition has an average particle size in the range of 3 to 50 μm.

  According to the present invention, the powder coating composition is efficiently applied to the substrate to be coated, and a smooth and uniform coating film is obtained. When the average particle size is less than 3 μm, the coating production process may be complicated, and the coating efficiency of the powder coating on the substrate to be coated may be reduced. On the other hand, when the average particle diameter exceeds 50 μm, uneven coating is noticeable when the film thickness is thin, and the coating film performance may be lowered. In addition, the average particle diameter in this invention shows a volume average particle diameter (average diameter weighted with the volume).

  (9) A coating film forming method for forming a coating film having a dry film thickness of 5 to 500 μm on the substrate to be coated with the powder coating composition described in any one of (1) to (8) above.

  (10) The coating film forming method according to (9), wherein the coating film is formed by baking the powder coating composition on the substrate to be coated by electrostatic coating.

  (11) A coated product in which a coating film is formed using a powder coating composition by the coating film forming method described in (9) or (10) above.

  According to the powder coating composition of the present invention and the coating film forming method using the powder coating composition, a high deodorizing action and a high purification action that cannot be obtained with a liquid paint using a solvent such as water or an organic solvent. It is possible to obtain a coated product that is expressed and has good coating film performance and paintability. Moreover, it is excellent in coating film performance, such as adhesiveness, hardness, and external appearance.

  In addition, since the porous fired product is melt-kneaded with the resin and does not use a solvent such as water or an organic solvent, secondary agglomeration of the porous fired product, which is a problem in liquid paint (the porous fired product is agglomerated) The coating film appearance, adhesion, and coating film hardness (hereinafter collectively referred to as “coating film performance”) are good, and spray coating is possible. Clogging of spray nozzles is unlikely to occur, making it suitable for continuous painting on industrial coating lines.

  Therefore, since the coating film obtained by the present invention exhibits the above-mentioned high deodorizing action and high purification action, and the coating film performance and paintability are good, indoor equipment such as indoor wall members, ceiling members, partitions, furniture, etc. It is preferably used in fields requiring deodorizing action and purification action, such as office equipment, in-house equipment such as vehicles, home appliances, and communication equipment.

  Hereinafter, the present invention will be described in detail. The members and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

<Powder coating composition>
The powder coating composition according to the present invention comprises kneading a raw material composition containing a thermosetting resin, a curing agent, and “pulverized charcoal and clay”, molding the kneaded product, and firing the molded body. A porous fired product (hereinafter also referred to as a porous fired product) ”, and the porous fired product with respect to a total amount of 100 parts by mass of the thermosetting resin and the curing agent. It contains 10 to 200 parts by mass.

  As the powdered charcoal used as the raw material of the porous fired product used in the powder coating composition of the present invention, various charcoal powders can be used, and examples thereof include charcoal, bamboo charcoal, palm charcoal, and shell charcoal. A powder is mentioned. Preferably, bamboo charcoal is used. These powdered charcoal can be used singly or in combination of a plurality of types as required. The particle size can be appropriately set as necessary, but generally 0.025 to 0.5 mm (500 to 60 mesh) is preferable.

  The clay used as the raw material of the porous fired product plays the role of an inorganic binder for forming a fired product with powdered charcoal, and porcelain clay or earthenware clay can be used as appropriate. Examples include porcelain earth, glazed clay, wax stone, and kaolin. These clays can be used singly or in combination as required. The use ratio of this clay can be appropriately set as required. However, when the target porous fired product is composed of powdered charcoal and clay, generally, the powdered charcoal is 70 to 90 parts by mass. On the other hand, the clay is preferably 10 to 30 parts by mass.

  Further, as a raw material for the porous fired product, one or more kinds selected from the group consisting of powdered barleystone, powdered tourmaline, or powdered precious stone may be used. In this case, more preferably 70 to 93% by mass of the total mass of each raw material component consisting of powdered charcoal and three types selected from the group consisting of powdered barleystone, powdered tourmaline or powdered precious stone. Is powdered charcoal, 1 to 35% by weight is powdered barley stone, 1 to 20% by weight is powdered tourmaline, and 1 to 20% by weight is powdery gypsumite, and powdered charcoal and powder The clay is in a ratio of 15 to 40 parts by mass with respect to 100 parts by mass of the total amount of each raw material component consisting of one or more kinds selected from the group consisting of powdered barleystone, powdered tourmaline, or powdered precious stone. In general, when each raw material component consisting of at least one of the above powdered charcoal and powdered barley stone, powdered tourmaline or powdered precious stone is within the above range, and the use ratio of clay is also within the above range Therefore, the object of the present invention can be achieved more suitably.

  Then, powdered barley stone, powdered tourmaline (also known as tourmaline) or powdered precious stone (high-temperature heat accompanying crustal deformation) used as a raw material as necessary to obtain the effect of promoting and sustaining the function of powdered coal It is an ore formed by water action and includes at least one of hydrous aluminum silicate as a main component. These particle diameters can be appropriately set as necessary, but generally 0.025 to 0.5 mm (500 to 60 mesh) is preferable as in the case of powdered coal. In addition, any one kind of powdered barley stone, powdered tourmaline, and powdered guinea stone can be used, or a plurality of kinds can be used in combination.

  For the raw material of the porous fired product, each of the above-mentioned powdered charcoal and one or more selected from the group consisting of powdered barleystone, powdered tourmaline or powdered precious stone, and clay In addition to the raw material components, powdered graphite meteorite (also known as graphite silica) can be used. The particle size of the powdered graphite meteorite can be appropriately set as necessary, but generally 0.025 to 0.5 mm (500 to 60 mesh) is preferable as in the case of powdered coal. The proportion of the powdered graphite meteorite used can be appropriately set as necessary, but is generally selected from the group consisting of powdered charcoal, powdered barleystone, powdered tourmaline, or powdered gypsumite. It is 3-5 mass parts with respect to 100 mass parts of total amounts of each raw material component which consists of more than types.

  In addition, the raw material of the porous fired product, if necessary, one or more selected from the group consisting of the above powdered charcoal, powdered barley stone, powdered tourmaline or powdered precious stone, clay, In addition to each raw material component, powdered shells or powdered corals can be used. The type of shell is not particularly limited, and common shells such as pearl oysters and crows are used. Further, the particle size of the powdered shell or coral can be appropriately set as necessary, but generally 0.025 to 0.5 mm (500 to 60 mesh) is preferable as in the case of powdered charcoal. The proportion of the powdered shell or powdered coral can be set as needed, but generally, from the group consisting of powdered charcoal and powdered barley stone, powdered tourmaline or powdered precious stone. It is 3-5 mass parts with respect to 100 mass parts of total amounts of each raw material component which consists of one or more selected.

  The production of the porous fired product is, first, at least one selected from the group consisting of the above powdered charcoal and clay, powdered barley stone, powdered tourmaline or powdered precious stone used as necessary, and A kneaded product is prepared by kneading a predetermined amount of a raw material composition to which powdered graphite meteorite, powdered shell, and powdered coral are added as necessary. The order of kneading these raw material components is not particularly limited, and all the raw material components can be kneaded in any order or simultaneously.

  Moreover, kneading | mixing of this raw material composition can be performed suitably using a well-known kneading means per se, for example, a earthen machine, various mixers, etc. are mentioned. In kneading these raw material components, if the kneading is insufficient or air is mixed in the kneaded product, it may crack during firing and become ash, and a porous fired product may not be obtained. Therefore, it is preferable to sufficiently knead the entire kneaded product so that air is not included in the kneaded product so that the whole becomes clay-like, and more preferably kneaded in a vacuum state as necessary.

  In addition, the kneaded product of the raw material composition (hereinafter also referred to as the raw material kneaded material) has an appropriate plasticity, and contains a certain amount of water so as to exhibit good moldability in the subsequent molding. It is desirable. In general, this moisture is covered by the moisture contained in the clay used as a raw material, but it is also possible to add water when preparing the kneaded material, if necessary. The moisture content of the kneaded product is not particularly limited as long as the kneaded product has an appropriate plasticity exhibiting good moldability, but generally 3 to 50% by mass of the total mass of the kneaded product is preferable.

  The raw material kneaded material prepared above is then formed into a desired shape. The shape to be molded can be any shape as required in the application of the porous fired product, and other shapes as required. Examples thereof include a spherical shape, a plate shape, and a rod shape. When used in the powder coating composition of the present invention, a spherical shape is preferred. The raw material kneaded product can be molded by appropriately using a known molding means per se, and examples thereof include extrusion molding, mold molding, and manual molding.

  The molded body of the raw material kneaded product formed into the desired shape is then fired at a temperature of generally 600 ° C. or higher, preferably 600 to 1500 ° C., to obtain the desired porous fired product. In addition, in the case of baking, baking can be performed, compressing a molded object as needed. The fired product can be hardened by compression. Of course, you may bake as it is, without compressing, and in this case, a baked product becomes comparatively brittle.

  In general, the firing is generally performed by first firing the molded body at a temperature of 600 to 1000 ° C., and once the molded body fired product is cooled to room temperature, the molded body is again heated at a temperature of 1000 to 1500 ° C. It can carry out by the two-stage baking which performs baking. The firing time can be appropriately set as necessary, but in general, the first firing is preferably 4 to 30 hours and the second firing is preferably 5 to 30 hours. According to this two-stage firing, there is an advantage that the temperature and time of the second firing can be adjusted according to the condition of the first firing, and the fired product collapses and becomes ash by cooling to room temperature once. There is also an advantage to prevent.

  Moreover, the said molded object can also be performed by the 1 step | paragraph baking which continuously bakes, raising temperature from the low temperature side to the high temperature side in the range of 600-1500 degreeC. The temperature rise of the firing temperature at the time of firing can be raised continuously or stepwise, and the degree of temperature rise can be appropriately set as necessary. It is preferable that an average temperature increase rate is 70-100 degreeC / min.

  Generally, as described above, the object of the present invention can be suitably achieved by performing two-stage firing or one-stage firing of a raw material kneaded product molded body within a certain firing temperature range. Moreover, this baking can be performed using a publicly known furnace or kiln, and examples thereof include a clay pot, a carbonization plant, and an iron kettle plant. In addition, the target porous baked product can also be continuously produced by feeding the formed body into the furnace or kiln using a belt conveyor or the like. At this time, a substantially white porous fired product and fired products of other colors can be simultaneously produced by feeding a part of the molded body into a refractory container. Furthermore, firing of the molded body is generally performed in an atmosphere in the air. At the end of firing, it is preferable that the fired product is taken out of the furnace or kiln after sufficiently cooling for about 2 to 5 days.

  The porous calcined product obtained as described above contains, in a porous carbonaceous matrix, fine particles of clay, and if necessary, at least one kind of powdered barley stone, powdered tourmaline, or powdered precious stone, In some cases, it is a molded porous body having a structure in which fine particles added with graphite meteorite, shells, and corals are dispersed and each of these components is sintered, and the color tone is substantially white. It is what is.

  Since the porous fired product has a sintered structure as described above, it has better mechanical strength than charcoal. Moreover, since the raw material kneaded material can be easily formed into a desired shape as described above, the porous fired product can be easily formed into a desired shape by forming the raw material kneaded material into a desired shape. It can be obtained as a molded body. The porous fired product has an excellent deodorizing action and purifying action, and also has various functions such as a humidity control action, a heat insulation action, a sound insulation action, a fire prevention action, and a sterilization action.

  Moreover, according to the use etc., the porous fired product can be used as it is in the state of the obtained molded product fired product, or it can be used as it is, or the product of the obtained molded product fired product state can be crushed. And it can also be made into a powder form and can be used for a use and the shape to be used for a use can be suitably selected as needed. The pulverization of the porous fired product in the form of a formed body can be easily performed by appropriately using a known pulverization means as appropriate, and examples thereof include various pulverizers, stone mortars, mixers and the like.

  Here, when the porous fired product is used as a raw material for the powder coating composition, the porous fired product preferably has an average particle size (volume average particle size) of about 3 to 100 μm, more preferably about 20 to 80 μm. It is preferable to grind. By adjusting to a particle size in this range, a smooth and uniform matte coating film can be obtained without causing the coating film made of the porous fired product to have a flaw. When a porous fired product having an average particle size of less than 3 μm is blended, classification and poor dispersion are likely to occur, and the finish of the coating film becomes crusty, or aggregates of porous fired product particles become a part of the coating film. In some cases, it is not preferable, and if it exceeds 100 μm, the porous fired product particles are generated in the thin film portion of the coating film, and it is difficult to obtain a smooth and uniform matte coating film surface.

  Moreover, titanium oxide can be used together with the porous fired product as a raw material of the kneaded material, if necessary. Titanium oxide is effective for antibacterial, deodorant / deodorant, antifouling, anti-algae, rust / deterioration prevention, salt damage prevention, mold prevention, oil adhesion and yellowing of toilets, water quality preservation and purification, etc. By using together, the effect of the present invention can be exhibited more powerfully. Although the ratio of a titanium oxide is not specifically limited, 1-10 mass parts is preferable with respect to 100 mass parts of porous baked products.

  The powder coating composition of the present invention comprises a thermosetting resin, which is a conventionally known component, and a curing agent as a main component, the above-mentioned porous fired product, and optionally other pigments and additives as necessary. It is something to be made.

  As described above, the content of the porous fired product is 10 to 200 parts by mass with respect to 100 parts by mass of the total amount of the thermosetting resin and the curing agent, preferably 20 to 150 parts by mass, and more preferably 50. -100 mass parts. When the content exceeds 200 parts by mass, the coating film performance is deteriorated. On the other hand, when the content is less than 10 parts by mass, a high deodorizing action and a high purification action cannot be obtained.

  As the thermosetting resin, those that are solid at room temperature can be used. For example, epoxy resin, acrylic resin, polyester resin, polyester / epoxy resin blended with epoxy resin and polyester resin, and epoxy resin blended with acrylic resin. Examples include acrylic / epoxy resins and fluororesins.

  Examples of the epoxy resin include glycidyl ester resin, glycidyl ether resin which is a condensate of bisphenol A or bisphenol F and epichlorohydrin, alicyclic epoxy resin, aliphatic epoxy resin, bromine-containing epoxy resin, phenol novolac Examples thereof include compounds containing two or more oxirane groups in one molecule, such as type epoxy resins and cresol novolac epoxy resins.

  Examples of the acrylic resin include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, (meth ) A copolymer of (meth) acrylic monomers such as tert-butyl acrylate, glycidyl (meth) acrylate, 2-methylglycidyl (meth) acrylate, styrene, and other radical polymerizable monomers.

  Furthermore, examples of the polyester resin include ethylene glycol, diethylene glycol, propanediol, pentanediol, hexanediol, neopentylglycol, trimethylolpropane, pentaerythritol, and other polyhydric alcohols, maleic acid, terephthalic acid, isophthalic acid, Examples thereof include those obtained by ester polymerization of carboxylic acid such as succinic acid, glutamic acid, adipic acid, sebacic acid, β-oxypropionic acid or carboxylic anhydride.

  The above-mentioned epoxy resin, acrylic resin, and polyester resin can be appropriately blended and used as polyester / epoxy resin, acrylic / epoxy resin, or the like.

  Examples of the fluororesin include fluorine monomers such as vinylidene fluoride, trifluoride ethylene, and vinyl fluoride, hydroxyl-containing alkyl monomers such as 2-hydroxyethyl (meth) acrylate, and the acrylic resin. The thing etc. which copolymerized the monomer used are mentioned. A specific example is “Lublon L-2” (manufactured by Daikin Industries).

  Examples of the curing agent include block polyisocyanate compounds such as alicyclic polyisocyanates blocked with ε-caprolactam, uretdione type polyisocyanate compounds, aliphatic polyvalent carboxylic acids such as sebacic acid, aminoplast resins, fats Aliphatic acid anhydrides, amine compounds, polyamide resins, imidazole compounds, imidazoline compounds, phenol resins, epoxy resins, others, triglycidyl isocyanate, triglycidyl isocyanurate, dicyandiamide, hydroxyalkylamide, glycoluril These curing agents can be appropriately selected according to the functional group of the thermosetting resin to be used.

  The mass ratio of the thermosetting resin and the curing agent in the powder coating component is preferably in the range of 40:60 to 96: 4 from the viewpoint of curability. Moreover, it is also preferable to use a mixture of two or more of the thermosetting resin and the curing agent. Furthermore, from the viewpoint of coating concealability and coating film physical properties, the total amount of the thermosetting resin and the curing agent in 100 parts by mass of the powder coating component is preferably 40 to 95 parts by mass. In addition to the thermosetting resin and the curing agent, a thermoplastic resin can also be used.

  In addition, when a pigment is used in the powder coating composition of the present invention in consideration of concealability, design, etc., the pigment occupies 5 to 60 parts by mass in 100 parts by mass of all components of the powder coating composition. Is preferred. When the pigment is less than 5 parts by mass, the concealability of the coating film is poor, and when it exceeds 60 parts by mass, the coating film performance may be deteriorated. Examples of pigments include various bright pigments such as aluminum flakes, interference mica, and colored mica, and colored pigments such as titanium dioxide, petals, yellow iron oxide, carbon black, phthalocyanine blue, phthalocyanine green, quinacridone pigments, and azo pigments. And extender pigments such as talc, silica, calcium carbonate, precipitated barium sulfate, and other anti-rust pigments.

  Furthermore, examples of the additives include silicones such as dimethyl silicone and methyl silicone, surface conditioners such as acrylic oligomers, antifoaming agents such as benzoin and benzoin derivatives, anti-waxing agents, curing catalysts, curing accelerators, and plasticizers. , Antistatic agents, charge control agents such as particulate aluminum oxide, ultraviolet absorbers, light stabilizers, antioxidants, pigment dispersants, flame retardants, fluidity-imparting agents and the like.

<Method for producing powder coating composition>
Next, the manufacturing method of the powder coating composition of this invention is described below.

  First, the porous fired product, thermosetting resin, curing agent and other components are premixed in a dry state. The mixture is kneaded while being heated and melted by a melt kneader in the same manner as a method generally used for producing a powder coating material, and is extruded. The heating and melting temperature at this time is appropriately determined according to the type of thermosetting resin to be used, but is generally preferably about 80 to 140 ° C. Thereafter, the compact is cooled and coarsely pulverized. After the coarsely pulverized particles thus obtained are further finely pulverized, the fine particles and coarse particles are removed using a classifier to obtain a powder coating composition having a predetermined particle size distribution.

  The powder coating composition of the present invention produced by the above production method preferably has an average particle size (volume average particle size) of 3 to 50 μm, more preferably 15 to 40 μm. The volume average particle diameter can be determined by a particle diameter measuring apparatus using a laser light scattering method generally used in the field of powder coatings. When the average particle size is less than 3 μm, it is difficult to control the coating film thickness due to electrostatic repulsion, and the coating efficiency decreases due to the decrease in the collection efficiency due to the cyclone during recovery and reuse. Problems such as reduced safety workability due to permeation may occur. On the other hand, when it exceeds 50 μm, the coating film leveling property is lowered and the coating film appearance may be inferior. The average particle diameter of the powder coating composition is determined by the film thickness of the target coating film. For example, when the film thickness is about 40 to 50 μm, the average particle diameter of the powder coating composition is preferably 25 to 30 μm. . The smaller the average particle size, the better the appearance of the coating film and the thin coating is possible. However, clogging occurs during spray coating and the like, and the workability is lowered and the adhesion rate of the paint is also lowered.

<Method for forming coating film>
In the coating film forming method of the present invention, a coating film having a dry film thickness of 5 to 500 μm is formed on the substrate to be coated. Although there is no restriction | limiting in the base material to be used by this invention, alloyed galvanized material, cast iron material, hot dip galvanized material, magnesium alloy material, aluminum die-cast material, surface these metals by degreasing, chemical conversion treatment, etc. Examples thereof include various treated metal plates or processed products, and plastic plates or processed products subjected to conductive treatment by applying a conductive primer or the like.

  The powder coating composition of the present invention can be applied to a substrate to be coated by various known and conventional methods such as electrostatic coating, fluid dipping, spraying, and in-mold. It is preferable to employ an electrostatic powder coating method using a coating gun. In the electrostatic powder coating method, a metal material as a substrate to be coated is grounded, and then a powder such as a corona charging type coating gun, a friction charging type coating gun, such as an electrostatic electric field cloud fluidized immersion coating device manufactured by Mesak Co., Ltd. The powder coating composition is sprayed using a coating apparatus.

  When the corona charging type coating gun is used, the load voltage applied to the powder coating composition by corona discharge treatment is preferably -50 to -100 KV, more preferably -60 to -90 KV from the viewpoint of coating efficiency and appearance. Set to. On the other hand, when using a frictional charging type coating gun, it is preferable that the internally generated current value of the powder coating composition is frictionally charged so as to be 1.0 to 8.0 μA from the viewpoint of coating efficiency and appearance. .

Moreover, the preferable discharge amount of each said coating gun is 50-400 g / min, and discharge pressure is 4.9 * 10 < ⁴ > -4.9 * 10 < ⁵ > Pa. Furthermore, the distance from the tip of the coating gun to the substrate to be coated is preferably 10 to 50 cm. By coating within these ranges, the particles of the powder coating composition can be coated efficiently and applied to the conductive substrate. The powder coating layer can be formed by electrostatic adhesion.

<Painted object>
And the coated material of this invention is obtained by baking this powder coating-film layer for the predetermined time at the temperature of 140-260 degreeC. The film thickness (set film thickness) after baking is 5 to 500 μm, preferably 40 to 100 μm.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited only to these Examples. In addition, unless otherwise indicated, a compounding quantity represents a mass part. The names of raw materials, paints, and equipment represent product names unless otherwise specified.

<Examples 1 to 13> and <Comparative Examples 1 to 5>
First, porous baked products A to I were prepared as follows, and the powder coating composition No. 1 to 16 were prepared, and these powder coating compositions were coated on a steel plate material to prepare coating test pieces of Examples 1 to 13 and Comparative Examples 1 to 5.

[Preparation of porous fired product]
The types and blending amounts of powdered charcoal, powdered barley stone, powdered tourmaline, powdered precious stone, and clay with a water content of 30% by mass shown in Table 1 were blended, and porous calcined products A to A were prepared according to the following preparation examples. I was prepared.

(Preparation Example A)
To 100 parts by mass of raw bamboo charcoal powder (average particle size 0.05 mm), 30 parts by mass of clay having a water content of 30% by mass was added, and the air was evacuated with a vacuum kneader (“VM-3 type”, manufactured by Antec Corporation). The mixture was kneaded for 60 minutes and then kneaded for 60 minutes under vacuum to obtain a raw material kneaded product. The raw material kneaded product is molded into a spherical shape while being compressed with a mold, and then the molded product is obtained from a temperature of 600 ° C. in an atmosphere in a carbonization plant (“RPG-08DX type”, manufactured by Fukuzawa Kogyo Co., Ltd.). The temperature was raised to 1400 ° C. at a rate of temperature increase of 100 ° C./min, and the mixture was calcined by holding at 1400 ° C. for 24 hours, and then cooled to room temperature over 3 days to obtain a porous fired product (φ20 mm, 11 g). It was. The porous fired product of this molded body was pulverized to obtain a porous fired product A in a powder form (250 mesh, average particle size of about 60 μm).

(Preparation Example B)
30 parts by mass of clay with a water content of 30% by mass with respect to 100 parts by mass of a mixture consisting of 99 parts by mass of raw bamboo charcoal powder (average particle diameter 0.05 mm) and 1 part by mass of barley stone powder (average particle diameter 0.05 mm) The mixture was added and kneaded in a vacuum kneader for 60 minutes while removing air, and then kneaded for 60 minutes in a vacuum state to obtain a raw material kneaded product. This raw material kneaded product was used in the same manner as in Preparation Example A to obtain a porous fired product (φ20 mm, 10 g) of a molded body. The porous fired product of this compact was pulverized to obtain a porous fired product B in the form of powder (250 mesh, average particle size of about 60 μm).

(Preparation Example C)
100 parts by mass of a mixture comprising 90 parts by mass of raw bamboo charcoal powder (average particle size 0.05 mm), 7 parts by mass of barley stone powder (average particle size 0.05 mm) and 3 parts by mass of tourmaline powder (average particle size 0.05 mm) On the other hand, 30 parts by mass of a clay having a water content of 30% by mass was added, kneaded for 60 minutes while venting air in a vacuum kneader, and then kneaded for 60 minutes in a vacuum state to obtain a raw material kneaded product. This raw material kneaded product was used in the same manner as in Preparation Example A to obtain a porous fired product (φ20 mm, 10 g) of a molded body. The porous fired product of this molded body was pulverized to obtain a porous fired product C in a powder form (250 mesh, average particle size of about 60 μm).

(Preparation Example D)
In Preparation Example C, raw material bamboo charcoal powder (average particle size 0.05 mm) 96 parts by mass, barley stone powder (average particle size 0.05 mm) 2 parts by mass and tourmaline powder (average particle size) 0.05 mm) A porous fired product (φ20 mm, φ20 mm) in the same manner as in Preparation Example C, except that the mixture was changed to 30 parts by mass of clay having a water content of 30% by mass with respect to 100 parts by mass of the mixture consisting of 2 parts by mass. 10 g) was obtained. The porous fired product of this compact was pulverized to obtain a porous fired product D in the form of powder (250 mesh, average particle size of about 60 μm).

(Preparation Example E)
In Preparation Example C, raw material bamboo charcoal powder (average particle size 0.05 mm) 90 parts by mass, barley stone powder (average particle size 0.05 mm) 6 parts by mass, tourmaline powder (average particle) Other than changing to 30 parts by mass of clay having a water content of 30% by mass with respect to 100 parts by mass of a mixture comprising 3 parts by mass of 0.05 mm in diameter and 1 part by mass of powdered precious stone (average particle size 0.003 mm) Produced a porous fired product (φ20 mm, 10 g) in the same manner as in Preparation Example C. The porous fired product of this molded body was pulverized to obtain a porous fired product E in the form of powder (250 mesh, average particle size of about 60 μm).

(Preparation Example F)
In Preparation Example C, a porous fired product (φ20 mm, 11 g) was obtained in the same manner as Preparation Example C, except that the raw bamboo charcoal powder was changed to charcoal powder (average particle size 0.05 mm). . The porous fired product of this compact was pulverized to obtain a porous fired product F in the form of powder (250 mesh, average particle size of about 60 μm).

(Preparation Example G)
A molded body in the same manner as in Preparation Example A, except that in Preparation Example A, the raw material bamboo charcoal powder (average particle size 0.05 mm) was changed to 100 parts by mass and the water content was changed to 14 parts by mass. Porous fired product (φ20 mm, 9 g) was obtained. The porous fired product of this molded body was pulverized to obtain a porous fired product G in the form of powder (250 mesh, average particle size of about 60 μm).

(Preparation Example H)
In Preparation Example E, raw material bamboo charcoal powder (average particle size 0.05 mm) 90 parts by mass, barley stone powder (average particle size 0.05 mm) 6 parts by mass, tourmaline powder (average particle size 0.05 mm) 3 parts by mass And in the same manner as in Preparation Example E, except that 100 parts by mass of a mixture consisting of 1 part by mass of powdered precious stone (average particle size 0.003 mm) was changed to 15 parts by mass of clay having a water content of 30% by mass. Thus, a porous fired product (φ20 mm, 11 g) was obtained. The porous fired product of this molded body was pulverized to obtain a porous fired product H in a powder form (250 mesh, average particle size of about 60 μm).

(Preparation Example I)
In Preparation Example E, 90 parts by mass of bamboo charcoal powder (average particle size 0.05 mm), 6 parts by mass of barley stone powder (average particle size 0.05 mm), 3 parts by mass of tourmaline powder (average particle size 0.05 mm) and powder Molded in the same manner as in Preparation Example E, except that 100 parts by mass of a mixture of 1 part by mass of precious stone (average particle size 0.003 mm) was changed to 38 parts by mass of clay having a water content of 30% by mass. A porous fired product (φ20 mm, 12 g) was obtained. The porous fired product of this compact was pulverized to obtain a porous fired product I in the form of powder (250 mesh, average particle size of about 60 μm).

  The average particle size and particle size distribution were measured using a particle size analyzer (“SK Laser”, manufactured by Seishin Enterprise Co., Ltd.).

[Preparation of powder coating composition]
To the thermosetting resin, curing agent, and porous fired product of the types and blending amounts shown in Table 2, 30 parts of titanium oxide (“CR-50”, manufactured by Ishihara Sangyo Co., Ltd.), 0.001 part of carbon black (“MA- 100 ", manufactured by Mitsubishi Chemical Corporation), and 0.5 parts of benzoin and 0.5 parts of anti-crater agent (" Acronal 4F ", manufactured by BASF. Acrylic oligomer) are added as additives, and a mixer (" Super mixer ") is added. , Manufactured by Nippon Spindle Co., Ltd.) for about 3 minutes to obtain a mixture.

  Next, the mixture is melt-kneaded and molded at about 100 ° C. with a melt kneader (“Busconyder”, manufactured by Buss), and the resulting molded product is cooled to room temperature, and then pulverized (“atomizer”, The mixture was coarsely pulverized by Nipowdar Co., Ltd. and further pulverized using a fine pulverizer jet mill (“IDS-2 type”, manufactured by Nippon Pneumatic Kogyo Co., Ltd.).

  The powder thus obtained is classified by an airflow classifier (“DS-2 type”, manufactured by Nippon Pneumatic Kogyo Co., Ltd.) to remove fine particles and coarse particles, and the average particle size (volume average particle size) is about 25 μm. Powder coating composition no. 1-16 were created. Powder coating composition No. Nos. 14 to 16 were prepared for comparative examples in which the porous fired product was not added and the blending amount was out of the scope of the present invention.

  The volume average particle size and particle size distribution were measured using a particle size analyzer ("Microtrack HRAX-100", manufactured by Nikkiso Co., Ltd.). As a measurement sample at this time, 50 g of a 0.1% by mass aqueous solution of polyoxyethylene (10) octylphenyl ether and 0.5 g of a powder coating composition to be measured are added to a sample bottle, and this sample bottle is subjected to ultrasonic waves. Powder paint dispersion water in which an aqueous solution was immersed by ultrasonic vibration for 3 minutes with a washing machine (“SILENTSONIC UT-105”, manufactured by Sharp Corporation) was used.

[Preparation of organic solvent paint and water-based paint (for comparative example)]
As a comparative example, an organic solvent paint and an aqueous paint containing a powdered porous fired product were prepared as follows.

(Preparation of organic solvent paint)
An organic solvent type alkyd / melamine resin-based paint “Olga Select 300” (manufactured by Nippon Paint Co., Ltd.) is blended with 76 parts by mass of the powdery porous fired product E prepared in the above Adjustment Example E with respect to 100 parts by mass of the resin. Organic solvent paint No. containing powdered porous fired product 1 was prepared.

(Preparation of water-based paint)
76 parts by mass of the powdered porous fired product F prepared in Preparation Example F above was added to an aqueous polyester / melamine resin-based paint “Ode Eco Line S-100” (manufactured by Nippon Paint Co., Ltd.) with respect to 100 parts by mass of the resin. Water-based paint No. containing a powdered porous fired product 1 was prepared.

[Coating film forming method]
The powder coating composition, organic solvent coating, and water-based coating obtained as described above were electrostatically coated on the coated base material of the alloyed hot-dip galvanized steel sheet, and compared with Examples 1 to 13 as shown in Table 3. The coating test piece of Examples 1-5 was created.

  The alloyed hot-dip galvanized steel sheet material is a hot-dip galvanized steel sheet material (SGCC material) specified by JIS-G-3302 “hot dip galvanized steel sheet”, and has a coating weight of F06, the size is 100 mm × 150 mm, and the plate thickness is 0 6 mm.

  For powder coating, the substrate to be coated is placed on a grounded conductive horizontal belt conveyor, and then from the tip of the gun head of the corona charging coating gun ("PG-1", manufactured by GEMA) to the steel plate material. The coating gun was set so that the distance was 15 cm, and only one side was painted with a coating gun applied voltage of −80 KV and a set film thickness of 30 to 50 μm. And the obtained coating test piece was baked on the conditions which can maintain the surface temperature of a test piece at 180 degreeC for 15 minutes.

  The water-based paint and the organic solvent-type paint are applied by spraying only one side with a spray gun caliber of 1.3 mm and an atomization pressure of 0.2 to 0.4 MPa by air spray. Was baked under the condition that the surface temperature of the film could be kept at 140 ° C. for 15 minutes. (Comparative Examples 1 and 2).

  The coating test specimens of Examples 1 to 13 and Comparative Examples 1 to 5 were evaluated for deodorizing action, purification action, coating film appearance, adhesion, coating film hardness, and coating properties by the following evaluation methods and evaluation criteria, and the results were obtained. It is shown in Table 3.

<Evaluation method>
[Deodorizing action (ammonia)]
(Primary evaluation)
The above-mentioned coating test piece after baking was left at room temperature for 24 hours, and then the degree of deodorization was evaluated by an ammonia adsorption test (detection tube method) under the following conditions. In addition, it evaluated three times with one coating test piece, and evaluated including variation.

  Ammonia water was injected into a 1 liter vacuum bottle (A) using a microsyringe. Next, 80 liters of nitrogen gas was introduced into the tetraback (B) made of vinyl fluoride resin, and then the ammonia gas was injected from the 1 liter vacuum bottle (A) into which the ammonia had been injected using a gas tight syringe. The initial concentration of ammonia gas in the vinyl chloride resin tetrabag (B) was adjusted by checking with a detector tube so that the initial concentration was 30 ppm. A test specimen was sealed in a 10 liter vinyl fluoride resin tetra-back (C) prepared separately, and the above-mentioned 10 liters of vinyl fluoride resin tetra-bag (B) whose ammonia gas concentration was adjusted to 30 ppm and the above 10 liters. A vinyl fluoride resin tetrabag (C) is connected by a pump, and the adjusted ammonia gas in the vinyl fluoride resin tetrabag (B) is 10 liters at a rate of 1 liter per minute using the pump. Was introduced into the above-mentioned vinyl fluoride resin tetrabag (C) in which a coating test piece was enclosed, and the test was started. The ammonia gas concentration in the vinyl fluoride resin tetrabag (C) 100 hours after the start of the test was measured with a gas detector tube. A blank test was performed by performing the above operation without enclosing a coating test piece. The temperature used for the test was 25 ° C.

(Secondary evaluation)
While applying a load of 500 grams on a 10 × 10 cm area of the paint specimen, the surface of the paint film was rubbed 100 times with gauze, and then the degree of deodorization of ammonia was evaluated under the same conditions as in the primary evaluation. evaluated. The results are shown in Table 3. In addition, it evaluated three times with one coating test piece, and evaluated including variation.

The evaluation is shown in the following five stages.
5 ... 0 ppm or more, less than 5 ppm 4 ... 5 ppm or more, less than 10 ppm 3 ... 10 ppm or more, less than 15 ppm 2 ... 15 ppm or more, less than 20 ppm 1 ... 20 ppm or more

[Purification (formaldehyde)]
(Primary evaluation)
After the baking, the coated test piece was allowed to stand at room temperature for 24 hours, and the degree of purification was evaluated by a formaldehyde adsorption test (detection tube method) under the following conditions. The results are shown in Table 3. In addition, it evaluated three times with one coating test piece, and evaluated including variation.

  Formalin was injected into a 1 liter vacuum bottle (A) using a microsyringe. Next, 80 liters of nitrogen gas was introduced into the tetraback (B) made of vinyl fluoride resin, and then formaldehyde gas was injected from the 1 liter vacuum bottle (A) into which the formalin had been injected, using a gas tight syringe. The initial concentration of formaldehyde gas in the vinyl chloride resin tetrabag (B) was adjusted by checking with a detector tube so as to be 30 ppm. A test specimen was sealed in a 10 liter vinyl fluoride resin tetrabac (C) separately prepared, and the vinyl fluoride resin tetrabac (B) whose formaldehyde gas concentration was adjusted to 30 ppm as described above and 10 liters of the above 10 liters. A vinyl fluoride resin tetrabag (C) is connected by a pump, and the adjusted formaldehyde gas in the vinyl fluoride resin tetrabag (B) is 10 liters at a rate of 1 liter per minute using the pump. Was introduced into the above-mentioned vinyl fluoride resin tetrabag (C) in which a coating test piece was enclosed, and the test was started. The formaldehyde gas concentration in the vinyl fluoride resin tetrabag (C) 100 hours after the start of the test was measured with a gas detector tube. A blank test was performed by performing the above operation without enclosing a coating test piece. The temperature used for the test was 25 ° C.

(Secondary evaluation)
While applying a load of 500 grams on a 10 × 10 cm area of the coating test piece and rubbing the surface of the coating 100 times with gauze, the degree of purification of formaldehyde was evaluated under the same conditions as in the primary evaluation. evaluated. The results are shown in Table 3. In addition, it evaluated three times with one coating test piece, and evaluated including variation.

The evaluation is shown in the following five stages.
5 ... 0 ppm or more, less than 10 ppm 4 ... 10 ppm or more, less than 15 ppm 3 ... 15 ppm or more, less than 20 ppm 2 ... 20 ppm or more, less than 25 ppm 1 ... 25 ppm or more

[Appearance of coating film]
The appearance state of the coating test piece was visually evaluated. The results are shown in Table 3.

The evaluation was shown in the following three stages.
3… Produces a sufficiently uniform matte feel 2… Produces a uniform matte feel 1… Produces a non-uniform matte feel

[Coating hardness]
About the coating test piece, after leaving the coating film after drying or baking at room temperature for 24 hours, the pencil scratch test was done based on JIS-K-5600 "paint general test method". The results are shown in Table 3 in terms of pencil hardness.

[Adhesion]
The cross-cut peel test was performed on the coating test piece in accordance with JIS-K-5600 “Paint General Test Method”. 100 square grids of 2 mm square were prepared, a peel test was performed using cellophane adhesive tape, and the number of grids that were not peeled was counted. The results are shown in Table 3.

The evaluation was shown in the following three stages.
3 ... 0/100 (no peeling)
2 ... 1/100 to 50/100 (50% or less peeling)
1 ... 51 / 100-100 / 100 (51% or more peeling)

[Paintability]
The time zone when clogging started at the tip of the spray gun during spray coating was evaluated. The results are shown in Table 3.

The evaluation was shown in the following three stages.
3 ... 1 hour or more, no clogging 2 ... about 30 minutes, clogging 1 ... about 1-10 minutes, clogging

  As is clear from the results in Table 3, this example exhibited a high deodorizing action and a high purification action by forming a coating film using the powder coating composition of the present invention. Moreover, it was excellent also in the external appearance of the coating film, hardness, adhesiveness, and paintability. On the other hand, the comparative example was not able to satisfy and satisfy all of the high deodorizing action and the high purification action, and the coating film appearance, hardness, adhesion and paintability.

Claims (11)

A powder coating composition containing a thermosetting resin, a curing agent, and a porous fired product containing powdered charcoal and clay,
A powder coating composition comprising 10 to 200 parts by mass of the porous fired product with respect to 100 parts by mass of the total amount of the thermosetting resin and the curing agent.   The powder coating composition according to claim 1, wherein the porous fired product is obtained by firing a kneaded product obtained by kneading a raw material composition containing powdered charcoal and clay.   The powder coating composition according to claim 1 or 2, wherein the powdered charcoal and the clay are used in an amount of 70 to 90 parts by mass for the powdered charcoal and 10 to 30 parts by mass for the clay.   The powder coating composition according to any one of claims 1 to 3, wherein the porous fired product further contains one or more kinds selected from the group consisting of powdered barleystone, powdered tourmaline, and powdered precious stone as a raw material component. .   The powder coating composition according to claim 4, wherein the porous fired product further contains powdered graphite meteorite as a raw material component.   The powder coating composition according to claim 4, wherein the porous fired product further contains a powdered shell or coral as a raw material component.   The powder coating composition according to any one of claims 1 to 6, wherein an average particle size of the porous fired product is in a range of 3 to 100 µm.   The powder coating composition according to any one of claims 1 to 7, wherein the powder coating composition has an average particle size in the range of 3 to 50 µm.   The coating-film formation method which forms the coating film of the range of 5-500 micrometers of dry film thicknesses with the powder coating material composition in any one of Claim 1 to 8 in a to-be-coated base material.   The coating film forming method according to claim 9, wherein the coating film is formed by applying the powder coating composition to the substrate to be coated by electrostatic coating and then baking the coating composition.   A coated article in which a coating film is formed using the powder coating composition by the coating film forming method according to claim 9 or 10.