JP2004143573A - Method for treating thermally sprayed metallic film on surface of non-metal formed body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide treatment of thermally sprayed metallic film on a non-metal formed body for improving the adhesion of metal for decoration, such as copper or bronze, to be thermally sprayed onto the surface of the non-metal formed body. <P>SOLUTION: The surface 1 of the non-metal formed body is washed and is subjected to sand blasting with silica sand S. Next, a film of base layer metal 4 of a prescribed thickness is formed thereon by thermally spraying aluminum or zinc which is the base layer metal 4. After the film surface is coated and impregnated with synthetic resin 5, copper or bronze which is metal 6 for decoration is thermally sprayed thereto and a sulfur-containing solution 7 is applied as post treatment particularly to the thermally sprayed surface of the copper to produce copper rust color. Then, the thermally sprayed surface is again coated and impregnated with the synthetic resin liquid 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for thermal spraying a decorative metal on a molded article, and more particularly, to a non-metal forming method for spraying a decorative metal such as copper or bronze on the surface of a nonmetallic molded article to form a metal coating. The present invention relates to a method for treating a metal sprayed film on a body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a molded body made of concrete or the like, a coating film may be formed by spraying a decorative metal such as copper to prevent corrosion and spalling due to aging and to decorate a surface.
[0003]
As a well-known document of the metal spray coating treatment of the surface of a non-metal molded body, there is (for example, Patent Document 1). In this metal spray coating treatment method, a mortar or the like adjusted to pH 3 to 10 is applied to the surface of concrete using low alkali cement to form a moisture-permeable underlayer. A metal for thermal spraying is formed by spraying a decorative metal such as copper.
[0004]
[Patent Document 1]
JP-A-6-25820 (pages 1-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
According to the above-described method for forming a metal spray coating, it is possible to prevent alkali corrosion and peeling on the surface of concrete. However, since the decorative metal such as copper is directly sprayed on the mortar surface using cement, there is a problem that the adhesive force of the decorative metal is small. SUMMARY OF THE INVENTION An object of the present invention is to provide a metal-sprayed film treatment of a non-metallic molded article capable of significantly increasing the adhesion of decorative metal such as copper or bronze sprayed on the surface of the non-metallic molded article.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention relates to a method of spraying a decorative metal onto a molded body made of a nonmetal to form a coating, wherein the surface of the molded body is sprayed with a base metal to form a coating. The method is characterized in that a decorative metal is sprayed after applying a synthetic resin liquid to the coating surface. When performing metal spraying, a rubber mask member may be applied to the surface of the molded body to mask and spray around the target portion. After spraying copper as a decorative metal, a sulfur-containing solution can be applied to the sprayed surface.
[0007]
Examples of the molded article targeted by the present invention include crafts, structures, and structures, and a coating can be formed by spraying a decorative metal on all or a part of the molded article surface. In addition, the present invention can be applied to a nameplate or a nameplate of a building such as a building, or a column, a roof (such as a colonial roof), a mechanical facility or a device pedestal of a building including a terrain. Further, the surface of the molded body can be applied not only to a plane portion but also to a complicated curved surface portion such as a pattern, a family crest, and a design.
[0008]
The present invention relates to a method for forming a coating by spraying a metal for surface decoration such as pure copper or bronze (bronze) on the surface of a non-metal molded body such as a natural stone or a concrete product that can be flame-sprayed. It is. For example, the present invention can be applied to all or part of the surface of an existing or newly installed torii gate, lantern, komainu, or statue in a shrine, temple, park, or the like, if necessary. In particular, in many places, such as torii gates, there are often attached nameplates or the like on which characters, patterns, or images such as shrine names, votive names, dates, etc. are engraved. However, most of the existing torii gates and the like have passed for many decades or more, and the details of the engraved parts such as letters are generally significantly weathered due to acid rain etc. and the appearance is reduced. .
[0009]
By applying the thermal spraying technique of the present invention to an old nameplate or the like, the nameplate or the like can be regenerated as new. However, some of the weathering has not proceeded with the blast pressure during the surface polishing performed before the flame spraying. Therefore, at the time of blasting, the blast pressure is adjusted to an appropriate pressure (about 5 kgf / cm ² ) using, for example, high-pressure water. The portion where dirt or the like strongly adheres to the surface of the molded body is completely removed and cleaned using acetone, thinner, or the like. Thereafter, the surface of the molded body is completely dried by natural drying or heat drying.
[0010]
Next, the surface of the molded body is observed to check whether there is a step required for thermal spraying. In general, some of the existing compacts that are older have sufficient notches necessary for thermal spraying without blasting. However, when sandblasting is required, a silica sand abrasive having a small particle size, for example, silica sand No. 6 (0. 40-0.05 mm), silica sand No. 6A (0.20-0.06 mm), and silica sand No. 7 (0.14-0.05 mm). On the other hand, in a newly-formed compact, sandblasting is performed with silica sand special No. 5 or silica sand No. 5A, and a notch having a depth required for thermal spraying is provided on the surface of the compact. Here, it is better not to use a steel abrasive. The reason for this is that there is a possibility that the grid may remain after being pierced into the material, which may cause the occurrence of red rust.
[0011]
Next, an underlayer is formed on the surface of the molded body with a highly adhesive metal. In forming the underlayer, a film is formed on the surface by thermal spraying with aluminum or zinc. The thickness of the coating on the flat part is about 50 to 100 micron. In practice, the thickness may be such that when pure copper or bronze is sprayed thereon, its color is attached. Thereafter, a permeable synthetic resin liquid is applied to the surface of the film. The synthetic resin solution is obtained by diluting a commercially available FRP concentrate with a diluent such as acetone to about 10 to 20 times, and then manually applying the sprayed surface with a brush or the like to sufficiently penetrate into the material. The purpose of applying the synthetic resin liquid to the metal sprayed surface is to increase the alkali resistance or acid resistance of the metal sprayed surface, prevent weathering, and increase the durability. After that, blasting may be performed again in some cases. At the time of this blasting, the clearance between the blast nozzle and the sprayed surface is set to be larger than usual, and the abrasive used is No. 6A having a small particle size or smaller.
[0012]
Examples of the above synthetic resin liquid include a vinyl ester resin liquid and a bisphenol resin liquid which are light red transparent liquids. Specifically, 1% of a curing agent is added, and the product name is Polycute having a specific gravity of 1.15 to 1.20. PC-760N and Polycute PC-701TN (manufactured by Kyushu Paint Co., Ltd.) can be used. Polycute PC-760N has a viscosity of 250 to 550 c. p. s. (25 ° C.), Composition: 55% of unsaturated polyester resin and 45% of styrene monomer, Curing properties: L. 20 to 50 minutes (25 ° C). The properties of Polycute PC-701TN are as follows: viscosity: 600 to 900 c. p. s. (25 ° C.), composition: 55% vinyl ester resin and 45% styrene monomer, curing properties: P.I. L. 35-55 minutes (25 ° C.).
[0013]
Before the synthetic resin liquid is completely cured, a decorative metal such as pure copper or bronze is sprayed. In this case, in order to increase the vigor of the decorative metal, it is preferable that the synthetic resin liquid is sprayed in a semi-dry state. By forming the coating by spraying the decorative metal, the surface of the molded article is decorated as clean as a new article, and the corrosion prevention effect is greatly enhanced by the triple structure with the base metal layer and the synthetic resin effect layer. When the base metal and the decorative metal are sprayed to form a coating layer having a predetermined thickness, the surroundings may be sprayed using a mask member. In particular, when a design portion such as a character, a symbol, a pattern, or the like is formed in a convex shape by the thermal spray coating layer, a metal member is sprayed in a state in which a mask member having a predetermined thickness is applied to the surface of the formed body and the periphery of the design portion is masked. In this case, since the design portion is raised and built up by the thermal spray layer in a high temperature state, it is preferable to use a heat-resistant rubber such as acrylic rubber, silicon or ethylene propylene rubber as a material of the mask member. If natural rubber having low heat resistance is used, the details of the mask member may be burned and adhere to the sprayed surface in black.
[0014]
After the desired sprayed film thickness is applied, a post-processing step is performed to finish the surface to obtain the desired copper rust and color. In this post-treatment process, a diluted solution of a sulfur-containing concentrated liquid such as a pharmaceutical product name “Rokuichi Happ” (manufactured by Mutoh Gakuyaku Co., Ltd.) is used to apply the solution onto the sprayed coating surface and polish it. . After the polishing, the above-mentioned synthetic resin liquid is permeated again if necessary. For the finishing allowance of the sprayed layer, the synthetic resin liquid is not allowed to permeate before polishing. This is because if the synthetic resin liquid is permeated first, the original metallic luster such as copper or bronze hardly appears at the time of finishing.
[0015]
In other words, if the synthetic resin liquid is permeated after polishing, it is difficult for toxins to come out of the sprayed layer, and there is an effect that the original gloss of copper, bronze, or the like is long-lasting. Therefore, the operation of infiltrating the synthetic resin liquid is performed in the last step. By infiltrating the metal sprayed surface with the synthetic resin liquid, the durability of the metal sprayed surface is significantly enhanced, which can greatly contribute from the viewpoint of weathering prevention. The synthetic resin liquid used here preferably has a high dilution concentration, and for example, a liquid having a ratio of synthetic resin: acetone of 1: 1 or 1: 1 or less is preferable. In addition, the above-mentioned 610 Hap (for home hot spring) is prepared by heating and dissolving 202.5 g of sulfur, 67.5 g of quicklime, 0.12 g of casein and 0.15 g of potassium sulfide in 729.73 g of ordinary water. It is obtained by concentrating to about 30 degrees Baume and filtering, and contains 160 to 195 g of sulfur in 1 kg.
[0016]
According to this method, the decorative metal is sprayed on the coating surface on which the base metal has been sprayed, so that the adhesion of the decorative metal is significantly increased. Furthermore, since the synthetic resin liquid is applied to the metal coating surface, the alkali resistance or acid resistance of the metal sprayed surface can be increased, and weathering due to aging of the molded body can be effectively prevented. Furthermore, when a sulfur-containing solution is applied to the copper sprayed layer as a post-treatment step, a desired copper rust color or a moist brown color can be expressed. In addition, when a non-target portion is masked with a flexible rubber mask member to form a sprayed coating, even if the surface of the molded body is a curved surface, it can be easily applied and the sprayed layer of the design portion is convex. It can be built up in a shape, and a three-dimensional effect can be obtained.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described based on examples shown in the drawings.
FIG. 1 is a process diagram of a metal spray coating method according to the present invention, FIG. 2 is a photograph of a concrete statue processed by the method of the present invention, (a) is a photograph showing a surface before the metal spray processing, and (b) is a metal spray. FIG. 3 is a photograph showing the surface of the stone lantern before treatment by the method of the present invention, FIG. 4 is a photograph showing the surface state after copper is sprayed on the stone lantern of FIG. 3, and FIG. 5 is a photograph showing the surface state after applying the sulfur-containing solution to the stone lantern of FIG. 4, FIG. 6 (a) is a perspective view showing a nameplate created by the method of the present invention, and (b) is a cross-sectional view of a main part of the nameplate. FIG.
[0018]
【Example】
In this embodiment, the surface of a non-metal molded body is polished by sand blasting if necessary to form notches, and then aluminum or zinc (base metal) is sprayed to form a coating, and then synthesized on the coating surface A coating is formed by applying a resin liquid and then spraying copper or bronze (decorative metal). Particularly, a copper-containing surface is finished by applying a sulfur-containing diluent and then applying a synthetic resin liquid. Hereinafter, the metal spray coating treatment will be described in accordance with a specific process procedure with reference to FIG.
[0019]
First, the surface 1 of a concrete statue (a non-metallic molded body) as shown in FIG. 2A was washed. In this case, washing was performed by spraying water at a high pressure from a high-pressure hose, or hand-washing with a scourer or a magic clone. In particular, when dirt or the like adhered to the surface 1 of the molded body, the adhered portion was washed with acetone or thinner, and then the surface was completely dried by natural drying or heat drying. After the drying, before the base metal 4 was sprayed on the surface 1 of the molded body, the surface 1 of the molded body was observed to check whether or not there was a step of a depth necessary for thermal spraying.
[0020]
The blasting treatment can be omitted if the old moldings have the necessary notches. However, in the case of new moldings such as crafts, sandblasting with silica sand S was performed on the surface to make the necessary notches for thermal spraying (FIG. 1). (A)). The silica sand abrasive used in the blasting process is a non-new molded body, and has a small particle size of silica sand No. 6 (manufactured by Ube Sand Industry Co., Ltd., particle size 0.4 to 0.05 mm) and silica sand No. 6A (particle size 0). 0.2 to 0.06 mm) or silica sand No. 7 (particle size: 0.14 to 0.05 mm), but in a new molded article, silica sand No. 5 to silica sand No. 5 (particle size: (Diameter 1.6 to 0.2 mm) was used.
[0021]
Thereafter, aluminum or zinc as the base metal 4 was flame-sprayed on the surface 1 of the molded body by the frame spray gun G (FIG. 1B). In this case, the thickness of the coating of the base metal 4 was set to 50 to 100 microns. Next, a permeable synthetic resin liquid 5 was applied on the thermal spray coating of the base metal 4 (FIG. 1C). In this case, the synthetic resin liquid 5 was diluted about 10 to 20 times and carefully applied to the sprayed surface with a brush. In order to increase the alkali resistance or acid resistance of the metal sprayed surface, the synthetic resin liquid 5 was permeated into the material of the molded body. As the synthetic resin liquid 5, Polycute PC-760N or Polycute PC-701TN (manufactured by Kyushu Paint Co., Ltd.) was used. When this synthetic resin liquid 5 is cured, it has the effect of extending the useful life of the molded article 1 and preventing weathering due to aging.
[0022]
Thereafter, before the synthetic resin liquid 5 was completely cured, copper or bronze as the decorative metal 6 was sprayed on the surface 1 of the molded body (FIG. 1 (D)). This thermal spraying was performed while keeping the synthetic resin liquid 5 in a semi-dry state. Here, with respect to the copper sprayed surface, a sulfur-containing solution was applied to the film surface of the decorative metal 6 in order to give a copper rust color or tint as desired (FIG. 1 (E)). As the sulfur-containing solution 7 used in this post-treatment step, a sulfur-containing concentrate of pharmaceuticals for household hot springs (trade name "610 HAPP" manufactured by Mutoh Kakuyaku Co., Ltd.) was diluted to a predetermined concentration and applied. Thereafter, the coated surface of the molded body 1 was polished by wiping with a soft cloth, and if necessary, the synthetic resin liquid 5 was again applied and permeated on the coated surface (FIG. 1 (F)).
[0023]
As described above, since the flame spraying of the base metal 4 and the application of the synthetic resin liquid 5 were performed before the copper or bronze as the decorative metal 6 was sprayed on the surface 1 of the molded body, the adhesion of the decorative metal 6 was reduced. Increased significantly. The composite film structure of the base metal 4, the cured layer of the synthetic resin liquid 5, and the decorative metal 6 was able to enhance the corrosion prevention effect as a unit of the four. In particular, the cured layer of the synthetic resin liquid 5 significantly increased the alkali resistance or the acid resistance of the metal sprayed surface, and effectively prevented weathering of the surface of the molded body 1 due to aging. Further, when the sulfur-containing solution 7 was applied to the copper sprayed layer 6, a desired copper rust color or a calm brownish color could be subtly produced (see the photograph of FIG. 2 (b)).
[0024]
The photograph in FIG. 3 shows a non-metallic lantern before the base metal is sprayed. The base metal is sprayed, the synthetic resin liquid 5 is applied, and then the copper is sprayed to form a coating. As shown in the photograph of No. 4, the surface of the lantern was decorated with the decorative metal 6 in a copper color. After that, when the sulfur-containing diluent 7 was further applied to the surface of the lantern, as shown in the photograph of FIG.
[0025]
FIG. 6 shows an example in which the processing method of the present invention is applied to a nonmetallic nameplate (or nameplate) 8. The surroundings are surrounded by a flexible rubber mask member 3 from which a design portion 2 such as a character to be drawn is die-cut. In this case, a sprayed coating layer having a required thickness is formed so as to cover, and the character portion is formed by a convex sprayed layer. That is, as shown in FIG. 7, while the periphery of the character portion 2 is masked by the mask member 3 having a predetermined thickness, the character portion 2 is thermally sprayed to form a coating. The mask member 3 used at this time is preferably made of a heat-resistant flexible rubber such as silicon rubber or ethylene propylene rubber. In addition, by using the flexible rubber mask member 3, masking can be easily performed even when the surface of the target object is curved.
[0026]
It should be noted that the present invention is not limited to the above embodiment, and various application modifications are possible. Although the mass-produced artefacts (concrete statues) have been illustrated in the above embodiment, natural stones and structures, such as torii, Buddhist temples, and guardian dogs, may be used as the whole surface or in the case of nonmetallic molded products. Applicable to the part surface.
[0027]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, not only the surface decoration of a molded object but the effect of preventing corrosion and peeling can be obtained by spraying a decorative metal on a base metal and a synthetic resin liquid (layer) on a molded object, and also decorative. There is an excellent effect that the adhesion of the metal for use can be significantly increased. In particular, by applying a synthetic resin liquid to the metal coating surface, the chemical durability of the metal sprayed surface against acid and base can be enhanced, and weathering of the molded article can be prevented.
[0028]
When the thermal spray coating is formed by using a flexible rubber mask member, the thermal spray coating can be easily applied to the curved surface with the surrounding area surely covered, and the design portion is coated with a thermal spray layer having a desired thickness. It can be raised to give rise to a three-dimensional appearance. In addition, when a sulfur-containing solution is applied to a copper sprayed layer, a desired brownish brown color can be achieved.
[Brief description of the drawings]
FIG. 1 is a process chart of a metal sprayed film processing method according to the present invention.
FIGS. 2A and 2B are photographs showing a surface before a metal spraying treatment, and FIG. 2B is a photograph showing a surface after a metal spraying treatment.
FIG. 3 is a photograph showing a surface state of a stone lantern before being treated by the method of the present invention.
FIG. 4 is a photograph showing a surface state after copper is sprayed on the stone lantern of FIG.
FIG. 5 is a photograph showing a surface state after applying a sulfur-containing solution to the stone lantern of FIG.
6A is a perspective view showing a nameplate created by the method of the present invention, and FIG. 6B is a cross-sectional view of a main part of the nameplate.
[Explanation of symbols]
1 Surface of non-metallic molded body 2 Design part (characters and patterns)
Reference Signs List 3 Mask member 4 Base metal 5 Synthetic resin solution 6 Decorative metal 7 Sulfur-containing solution 8 Nameplate S Silica sand G Frame spray gun

Claims (5)

In the method of spraying a decorative metal onto a surface of a molded body made of a nonmetal to form a coating, a coating is formed by flame spraying a base metal on the surface of the molded body, and a synthetic resin solution is applied to the surface of the coating. A method for treating a metal sprayed film on a surface of a non-metal molded body, which comprises spraying a decorative metal afterwards. 2. The method according to claim 1, wherein, when performing metal spraying, a rubber mask member is applied to the surface of the molded body to mask and spray the periphery of a target portion. . The method of claim 1 or 2, wherein a sulfur-containing solution is applied to a sprayed surface after copper as a decorative metal is sprayed. The method for treating a metal sprayed film on a nonmetallic molded product according to any one of claims 1 to 3, wherein the molded product is a craft. The method for treating a metal sprayed film on a nonmetallic molded product according to any one of claims 1 to 3, wherein the molded product is a structure.

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