JP4001103B2 - Bronze image corrosion prevention method - Google Patents

Description

  The present invention relates to a method for preventing corrosion of a bronze image, and more particularly, to a method for preventing corrosion of a bronze image placed outdoors due to acid rain or the like.

  Bronze statues are so-called bronze figurines represented by, for example, bronze statues of Takamori Saigo in Ueno, Tokyo, and many have high value as arts and crafts. As the metal material of the bronze image, a material mainly composed of copper, tin, lead, and zinc as necessary is used.

  A bronze image is usually created by the following steps. First, a clay mold is created, corrected and repaired as appropriate, and a gypsum mold is created based on the clay mold. Next, the metal material melted by heating to about 1200 ° C. is poured into a mold, cooled, removed from casting, and finally colored to complete.

  However, the bronze image is prone to corrosion. In particular, when a bronze image placed outdoors is exposed to wind and rain, particularly acid rain, corrosion may proceed within a few years after creation, and in some cases, the original shape may not be retained.

  In order to solve such a problem, for example, “the surface of the stone material is scraped to finish the shape of the image with the required roughness, and the bronze liquid is uniformly applied to the surface or / and the copper foil is overlaid and pasted. Is known, a copper film having a required thickness is formed, and a surface protective agent such as an acrylic agent is appropriately applied to the surface of the copper film and dried. "(Practical model literature 1).

Utility model document 1

Registered Utility Model Publication No. 3061693

  However, the above technique has the following problems. (1) When a bronze solution in which copper powder is dissolved in a solvent is applied to a stone image, the surface after curing is completely different from the surface of a real bronze image, and the value as an art craft is extremely low. Become. (2) The internal stone image and the image made of metal (copper) with a thickness of 3 to 5 mm have completely different expansion rates due to changes in temperature, so the paint cannot follow the expansion rate of bronze, and within a few years Cracks and the like will occur.

  Therefore, an object of the present invention is to provide a method for preventing corrosion of a bronze image without impairing the value as a craft.

  As a result of diligent research to solve the above problems, the present inventor impairs the aesthetics of the bronze image, such as the texture and color tone, by applying to the bronze image a mixture of enamel paint and sulfur dispersed or dissolved in a solvent. Thus, the inventors have found that corrosion can be prevented over a long period of time, and completed the present invention.

That is, the present invention provides a method for preventing corrosion of a bronze image, characterized in that a mixed solution obtained by dispersing or dissolving enamel paint and sulfur in a solvent is applied to the bronze image.
In addition, the present invention provides a method for preventing corrosion of a bronze image in which, after such a mixture is applied to the bronze image, an acrylic urethane paint is applied.
The present invention also provides a method for preventing corrosion of a bronze image in which a water-based paint is applied between the application of a mixed solution and the application of an acrylic urethane paint.
The present invention also provides a method for preventing corrosion of a bronze image in which the mixing ratio (weight ratio) of enamel paint and sulfur is 100/1 to 100/20.

  If the method of this invention is used, corrosion of a bronze image can be prevented over a long period, without impairing the value as an art craft.

  Since enamel paint takes a long time to dry, it takes a very long time (1 day or more) to be completely dried, but it has the property that unevenness does not easily occur, and it is excellent as a paint for preventing corrosion of bronze images. Yes. Specific examples of the product include house paint external enamel (Kawakami Paint Co., Ltd.). Sulfur is preferably in the form of powder from the viewpoint of easy dispersion or dissolution in a solvent. Specific examples of such products include reagent sulfur (powder) (Kanto Chemical Co., Inc.) and the like. By using enamel paint and sulfur, corrosion can be prevented over a long period of time without impairing the aesthetics of the bronze image such as texture and color tone. The weight ratio between the enamel paint and sulfur is preferably 100/1 to 100/20, and particularly preferably 100/3 to 100/10. If it is 100/1 to 100/20, the effect of maintaining the texture and color tone of the bronze image is particularly remarkable.

  The solvent to be used is not particularly limited as long as it can disperse or dissolve the enamel paint and sulfur, and examples thereof include a paint thin solution. Specific product names include, for example, Campepaint thinning liquid (Kampehapio Co., Ltd.) and the like.

  The method for preventing corrosion of a bronze image of the present invention can be performed, for example, as follows. First, dirt attached to the bronze image is removed, for example, with a brass wire brush. Next, a bronze image is applied with a mixture of enamel paint and sulfur dissolved in a solvent. There are no particular restrictions on the application method, and for example, brushing or spraying may be used, but brushing is preferred from the viewpoint of aesthetics.

  Next, it is preferable to apply a water-based paint. Thereby, the texture and color tone of the bronze image can be maintained. Specific examples of product names include New Sakura Color Pro (Sakura Crepas Co., Ltd.). The aqueous paint may be applied either before or after the transparent enamel paint is dried, but is preferably after drying. There are no particular restrictions on the application method, and for example, brushing or spraying may be used, but brushing is preferred from the point of view of beauty.

  Finally, it is preferable to apply an acrylic urethane paint. Thereby, corrosion of a bronze image can be prevented over a long period of time. There is no restriction | limiting in particular in the method of application | coating, For example, brushing and spraying etc. may be sufficient, but spraying is preferable from the point of aesthetics. The acrylic urethane coating may be applied before or after the water-based coating is dried, but is preferably after drying. Examples of the acrylic urethane paint include Panalock two-component acrylic urethane paint (Rock Paint Co., Ltd.).

  EXAMPLES Next, although an Example is shown and this invention is demonstrated further in detail, this invention is not limited to a following example.

  Two small bronze images of the same type were prepared according to a conventional method using 85 parts by weight of copper, 14 parts by weight of tin, and 1 part by weight of lead as metal materials. The bronze image was well polished with a brass wire brush. Next, 100 parts by weight of enamel paint (house paint exterior enamel manufactured by Kawakami Paint Co., Ltd.) and 5 parts by weight of powdered sulfur (reagent Iou made by Kanto Chemical Co., Ltd.) are mixed with 20 parts by weight of paint thin solution (made by Campehapio Co., Ltd.). The dispersed liquid mixture was brushed on the bronze image. After drying the mixed solution, a water-based paint (New Sakura Color Pro manufactured by Sakura Crepas Co., Ltd.) was applied. Its thickness was about 0.1 mm. After the drying, an acrylic urethane paint (manufactured by Rock Paint Co., Ltd.) was applied by spraying. Its thickness was about 0.01 to 0.03 mm.

  One bronze image subjected to the above-mentioned corrosion prevention means was sprayed with artificial acid rain obtained from NIST (National Institute of Standards and Technology) in the United States, 10 times a day for 1 year using a commercial atomizer. did. The spray amount was adjusted to be 10 times the annual precipitation of 2000 mm. (2) The other bronze image was sprayed with rainwater collected by a large funnel indoors 10 times a day for one year using a commercially available spray bottle. The spray amount was adjusted to be 10 times the annual precipitation of 2000 mm.

  As a result, neither bronze image was found to be corroded at all, and the aesthetic appearance was excellent.

  The method for preventing corrosion of a bronze image of the present invention is particularly effective for preventing corrosion of a bronze image placed outdoors.

Claims (4)

  A method for preventing corrosion of a bronze image, characterized in that a mixed solution in which enamel paint and sulfur are dispersed or dissolved in a solvent is applied to the bronze image.   2. The method for preventing corrosion of a bronze image according to claim 1, wherein the mixed liquid is applied to the bronze image, and then an acrylic urethane paint is applied.   The method for preventing corrosion of bronze images according to claim 2, wherein a water-based paint is applied between the application of the mixed liquid and the acrylic urethane paint.   The method for preventing corrosion of a bronze image according to any one of claims 1 to 3, wherein the mixing ratio (weight ratio) of the enamel paint and sulfur is 100/1 to 100/20.