Paint and method for manufacturing paint

Abstract

The aim is to reduce CO2 emissions associated with paint manufacturing, provide a paint that has coating performance equivalent to or better than conventional paints, and further contribute to improved functionality. [Solution] A paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate. Also, a method for manufacturing a paint, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate, and the paint is manufactured by mixing the pigment, the additive, the solvent, the resin, and the iron carbonate.

Description

Technical Field

[0001] The present invention relates to a coating material and a method for producing a coating material. Background Art

[0002] In recent years, global warming, that is, the greenhouse effect caused by the increase in the concentration of CO2 (carbon dioxide) in the atmosphere, has caused a problem of adverse effects on ecosystems and the like that has become serious, and reduction of CO2 emissions on a global scale is demanded. Here, CO2 emissions in the construction field include not only CO2 emissions associated with the construction of buildings, but also CO2 emissions associated with the production of coating materials used for buildings.

[0003] By the way, a coating material is composed of a plurality of materials, and CO2 is emitted during the production of any of the constituent materials. Therefore, in order to calculate the CO2 emission amount of the coating material as a whole, it is necessary to sum up the CO2 emission amounts for each constituent material of the coating material and perform a total calculation. Prior Art Documents Patent Documents

[0004] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2024-008502 Summary of the Invention Problems to be Solved by the Invention

[0005] For example, among the constituent materials of a coating material, the use of a biomass resin as a resin can reduce CO2 emissions associated with the production of the coating material. However, the use of a biomass resin as a constituent material of a coating material may cause deterioration of coating film properties such as weather resistance, heat resistance, water resistance, and coating film adhesion. Therefore, it has been difficult to reduce CO2 emissions associated with the production of a coating material while suppressing deterioration of coating film properties.

[0006] One example of the object of the present invention is to provide a paint that reduces CO2 emissions related to the manufacture of paint, has coating performance equivalent to or better than conventional paints, and further contributes to improved functionality. Other objects of the present invention will become apparent from the description herein. [Means for solving the problem]

[0007] One aspect of the present invention is a paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate.

[0008] One aspect of the present invention is a method for producing a paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate, and the paint is produced by mixing the pigment, the additive, the solvent, the resin, and the iron carbonate.

[0009] Other features of the present invention will be revealed in the specification and drawings described below. [Effects of the Invention]

[0010] According to the above-described aspect of the present invention, it is possible to provide a paint that reduces CO2 emissions related to the manufacture of paint, has coating film performance equivalent to or better than conventional paints, and further contributes to improved functionality. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is an explanatory diagram illustrating the component ratios of the constituent materials in paint 10, as an example of comparative paint 10A and paint 10 in which the mass of iron carbonate is 20%. [Figure 2] Figure 2 is an explanatory diagram (conceptual diagram) showing the balance of CO2 emissions related to the production of iron carbonate in this embodiment. [Figure 3]Figure 3 is a flowchart showing the manufacturing procedure for paint 10. [Figure 4] Figure 4 is a flowchart showing one aspect of the iron carbonate manufacturing procedure. [Figure 5] Figure 5 is a table describing the test specimens used in the coating performance test of the paint 10 of this embodiment. [Figure 6] Figure 6A is a graph showing the change in gloss retention rate over time in the weather resistance test of test specimen A. Figure 6B is a graph showing the change in color difference ΔE over time in the weather resistance test of test specimen A. [Figure 7] Figure 7A is a graph showing the change in gloss retention over time in the weather resistance test of test specimen U. Figure 7B is a graph showing the change in color difference ΔE over time in the weather resistance test of test specimen U. [Figure 8] Figure 8A is a graph showing the change in gloss retention over time during the weather resistance test of test specimen G. Figure 8B is a graph showing the change in color difference ΔE over time during the weather resistance test of test specimen G. [Figure 9] Figure 9A is a graph showing the time change in 60-degree specular gloss of test specimen F during the weather resistance test. Figure 9B is a graph showing the time change in color difference ΔE during the weather resistance test of test specimen F. [Figure 10] Figure 10 is a graph showing the change in ammonia concentration over time during the first ammonia gas removal performance test of test specimen G. [Figure 11] Figure 11 is a graph showing the change in ammonia concentration over time during the fifth ammonia gas removal performance test of test specimen G. [Modes for carrying out the invention]

[0012] The following matters become clear from this specification and the accompanying drawings:

[0013] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same or equivalent components, members, etc. shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate.

[0014] ===Present Embodiment=== <<Outline of Paint>> FIG. 1 is an explanatory diagram illustrating the component ratios of constituent materials in the coating material 10A of a comparative example and the coating material 10 according to an example of the present embodiment when the mass of iron carbonate is 20%.

[0015] As shown in FIG. 1, the constituent material of the coating material 10A of the comparative example is composed of a plurality of components, namely a pigment, an additive, a solvent, and a resin. Here, for ease of explanation, the component ratio of each constituent material of the coating material 10A is set to 25% by mass, but the component ratio is not limited thereto, and the component ratio of the constituent materials of the coating material 10A can be arbitrarily changed.

[0016] Among the constituent materials of the coating material 10A, the additive contains an antibacterial agent. Examples of the antibacterial agent include metals such as silver, copper, zinc and titanium oxide, organic antibacterial agents (aldehyde-based, phenol-based, pyrithione-based, alcohol-based) and chlorine-based antibacterial agents (sodium hypochlorite, trichloroisocyanuric, chlorine dioxide isothiazoline-based), and the like. The solvent is water, a solvent, or the like.

[0017] As shown in FIG. 1, iron carbonate (FeCO3) is further added to the constituent materials of the coating material 10 of the present embodiment from the constituent materials of the coating material of the comparative example. Among the constituent materials of the coating material 10 of the present embodiment, there are shown Example 1 of the coating material 10 of the present embodiment, which is a case where the component ratios of the pigment, additive, solvent and resin are lowered due to the addition of iron carbonate, and Example 2 of the coating material 10 of the present embodiment, which is a case where the ratios of the solvent and resin do not change even when iron carbonate is added.

[0018] However, the addition ratio of iron carbonate in the coating material 10 may be other than 20%, and may be 30% by mass or less of the total mass of the constituent materials of the coating material 10 of the present embodiment. That is, when the total mass of the pigment, the additive, the solvent, the resin and the iron carbonate is 100% in the coating material 10 of the present embodiment, the mass of the iron carbonate is 30% or less based on the total mass. In other words, in the coating material 10 of the present embodiment, a value obtained by dividing the mass of iron carbonate by the total mass of the pigment, the additive, the solvent, the resin and the iron carbonate is 30% or less.

[0019] With this type of paint 10, it is possible to reduce CO2 emissions related to the manufacture of the paint 10, while also achieving coating performance equal to or better than that of the comparative example paint 10A. Below, we will first explain the aspects of reducing CO2 emissions related to the manufacture of the paint 10.

[0020] Figure 2 is an explanatory diagram (conceptual diagram) showing the balance of CO2 emissions related to the production of iron carbonate in this embodiment.

[0021] The CO2 emission balance (C) related to the production of iron carbonate is calculated by the balance between the CO2 emissions (A) related to the production of iron carbonate and the amount of CO2 absorbed and fixed (B) related to the production of iron carbonate (C=AB), as shown in Figure 2. In the paint 10 of this embodiment, as will be described later, iron carbonate is produced by reacting carbon dioxide (CO2) emitted from the factory with scrap iron (Fe), so these CO2 emissions related to the raw materials of iron carbonate are not added to the CO2 emission balance (C) related to the production of iron carbonate. That is, the CO2 emissions (A) related to the production of iron carbonate are calculated by setting these CO2 emissions related to the raw materials of iron carbonate to 0. Furthermore, as will be described later, according to this embodiment, iron carbonate can be mass-produced, so the CO2 emissions (A) related to the production of iron carbonate can be reduced to a smaller value.

[0022] When iron carbonate is added to the paint of this embodiment, the following two effects are exhibited. That is, 1. Add iron carbonate to conventional paints. 2. Some of the components of conventional paints, such as viscosity modifiers, diluents, fillers, and other additives, are replaced with iron carbonate. Furthermore, in case 1 above, even if iron carbonate is added, the CO2 emissions related to the production of iron carbonate are negative, so the CO2 emissions related to the production of the paint 10 as a whole will be lower than before. Also, in case 2 above, the CO2 emissions from the replacement of some of the paint's constituent materials will be reduced, so the CO2 emissions related to the production of the paint 10 will be even lower than in case 1 above.

[0023] As described above, the CO2 absorption and fixation amount (B) associated with the production of iron carbonate is larger than the CO2 emission amount (A) associated with the production of iron carbonate (A<B), so the balance (C) of CO2 emissions associated with the production of iron carbonate becomes a negative value. For this reason, the CO2 emissions associated with the production of the coating material 10 of the present embodiment containing iron carbonate are reduced compared to the coating material 10A of the comparative example. In other words, the CO2 emissions associated with the production of the coating material 10 of the present embodiment can be reduced because it is a value obtained by summing the CO2 emissions of the pigment, the CO2 emissions of the additives, the CO2 emissions of the solvent, the CO2 emissions of the resin, and the balance (C) of CO2 emissions of iron carbonate. Furthermore, since workability is improved by adding iron carbonate to the coating material, it becomes possible to reduce the addition amount of additives such as viscosity modifiers, dilution solvents, and fillers, which can contribute to further reduction of CO2 emissions. However, the method for producing iron carbonate is not limited to this, and other embodiments may be employed.

[0024] <<Production Procedure of Coating Material 10>> Figure 3 is a flow diagram showing the production procedure of the coating material 10.

[0025] As shown in Figure 3, materials other than iron carbonate (here, pigments, additives, solvents, resins, etc.) are prepared (S001). As described above, when producing the coating material 10 by mixing iron carbonate into the coating material 10A of the comparative example, the coating material 10A of the comparative example may be prepared. Next, iron carbonate is prepared (S002).

[0026] An example of iron carbonate includes a powder containing a plurality of iron carbonate particles. However, iron carbonate may be in other forms. At this time, the average particle diameter of the iron carbonate particles is, for example, 2.5 µm or more and 12 µm or less, and the shape of the iron carbonate particles is spherical. Further, the purity of the iron carbonate is approximately 100%. However, the average particle diameter, shape, and purity of the iron carbonate particles are not limited thereto, and other embodiments may be employed.

[0027] Finally, materials other than iron carbonate (here, pigments, additives, solvents, resins, etc.) and iron carbonate are mixed to produce the coating material 10 (S003).

[0028] Figure 4 is a flow chart showing one aspect of the iron carbonate manufacturing procedure. However, the iron carbonate manufacturing procedure is not limited to the flow chart in Figure 4; it is sufficient as long as all the constituent materials of iron carbonate are uniformly mixed in the end.

[0029] In this embodiment, iron carbonate is produced by preparing scrap iron (S101), preparing carbon dioxide (S102), and reacting the carbon dioxide with the scrap iron (S103). This allows for the large-scale industrial production of iron carbonate. Furthermore, the CO2 emissions associated with the production of the raw materials for iron carbonate can be reduced to zero. In addition, this contributes to waste reduction, recycling, and a reduction in environmental impact, thus contributing to the SDGs. However, iron carbonate may be produced by a procedure other than that shown in Figure 4.

[0030] Iron carbonate may also be produced in the atmosphere at room temperature and atmospheric pressure with the addition of ascorbic acid. This facilitates the formation of iron carbonate particles and enables the large-scale industrial production of iron carbonate. However, iron carbonate may also be produced without the addition of ascorbic acid, or in a location other than the atmosphere at room temperature and atmospheric pressure.

[0031] <<Coating Performance Test>> The paint 10 of this embodiment not only reduces CO2 emissions related to the manufacture of the paint 10, but also suppresses the deterioration of the coating performance of the paint 10, or even contributes to improving its performance. Below, we will describe the results of a coating performance test conducted on the paint 10 of this embodiment, and verify the coating performance of the paint 10.

[0032] Figure 5 is a table describing the test specimens used in the coating performance test of the paint 10 of this embodiment.

[0033] In the coating performance test of the paint 10 of this embodiment, as shown in Figure 5, test specimens A, U, G, and F were prepared according to the type of paint. Here, test specimen A is an acrylic emulsion paint, test specimen U is a one-component urethane resin-based paint, test specimen G is a glossy acrylic emulsion paint, and test specimen F is a one-component water-based fluororesin paint.

[0034] As shown in Figure 5, test specimens A, U, G, and F were each prepared with different iron carbonate addition rates: 0%, 5%, 10%, 20%, and 30%. However, only test specimen F (one-component water-based fluororesin paint) had an iron carbonate addition rate of 30%. In the following explanation, the acrylic emulsion paint test specimen with an iron carbonate addition rate of 10% will be referred to as "Test Specimen A-10".

[0035] In the coating performance test of the paint 10 of this embodiment, the following tests were specifically performed using the test specimens described above. Test 1: Weather resistance Test 2: Water resistance, low temperature resistance, heat resistance Test 3: Coating adhesion Test 4: Ammonia gas removal performance The results of each of the tests, from Test 1 to Test 4, will be explained below.

[0036] <Test 1: Weather resistance> Figure 6A is a graph showing the change in gloss retention rate over time in the weather resistance test of test specimen A. Figure 6B is a graph showing the change in color difference ΔE over time in the weather resistance test of test specimen A.

[0037] In Figure 6A, the horizontal axis represents elapsed time (in hours), and the vertical axis represents gloss retention rate (in percent). In this embodiment, the weathering test employs the super xenon accelerated weathering test, and the accelerated weathering standard is set to "gloss retention rate of 60% or more after 80 hours" based on the Japanese Industrial Standard (JIS) "JIS K5663 Synthetic Resin Emulsion Paints and Sealers". In Figure 6A, this accelerated weathering standard value is shown by a dashed line.

[0038] In Figure 6B, the horizontal axis represents elapsed time (in hours), and the vertical axis represents the color difference ΔE. Similar to the gloss retention rate in Figure 6A, the accelerated weathering standard, based on the Japanese Industrial Standard (JIS) "JIS K5663 Synthetic Resin Emulsion Paints and Sealers," was set as "color difference ΔE of 3 or less after 80 hours." Here, "color difference ΔE of 3 or less" means that there is "no significant color difference." In Figure 6B, this accelerated weathering standard value is shown with a dashed line.

[0039] As shown in Figures 6A and 6B, all of the test specimens, A-5, A-10, and A-20, along with test specimen A-0 which does not contain iron carbonate, meet the criteria for accelerated weathering, indicating that the deterioration of the coating performance related to weathering resistance is suppressed.

[0040] Figure 7A is a graph showing the change in gloss retention over time in the weather resistance test of test specimen U. Figure 7B is a graph showing the change in color difference ΔE over time in the weather resistance test of test specimen U.

[0041] In Figure 7A, the horizontal axis represents elapsed time (in hours), and the vertical axis represents gloss retention rate (in percent). In this embodiment, the weathering test employs the super xenon accelerated weathering test, and the accelerated weathering standard based on the Japanese Industrial Standard (JIS) "JIS K5658 Grade 2 Weather-Resistant Topcoats for Buildings" was set to "gloss retention rate of 80% or more after 400 hours." In Figure 7A, this accelerated weathering standard value is shown by a dashed line.

[0042] In Figure 7B, the horizontal axis represents elapsed time (in hours), and the vertical axis represents the color difference ΔE. Similar to the gloss retention rate in Figure 7A, the accelerated weathering standard, based on the Japanese Industrial Standard (JIS) "JIS K5658 Grade 2 Weather-Resistant Topcoat Paints for Buildings," was set as "color difference ΔE of 3 or less after 400 hours." In Figure 7B, this accelerated weathering standard value is shown with a dashed line.

[0043] As shown in Figures 7A and 7B, all of the test specimens, U-5, U-10, and U-20, along with test specimen U-0 which does not contain iron carbonate, meet the criteria for accelerated weathering, indicating that the deterioration of the coating performance related to weathering resistance is suppressed.

[0044] Figure 8A is a graph showing the change in gloss retention over time during the weather resistance test of test specimen G. Figure 8B is a graph showing the change in color difference ΔE over time during the weather resistance test of test specimen G.

[0045] In Figure 8A, the horizontal axis represents elapsed time (in hours), and the vertical axis represents gloss retention rate (in percent). In this embodiment, the weathering test employs the super xenon accelerated weathering test, and the accelerated weathering standards based on the Japanese Industrial Standards (JIS) "JIS K5660 Glossy Synthetic Resin Emulsion Paint" were set as "gloss retention rate of 60% or more after 160 hours" and "gloss retention rate of 80% or more after 400 hours." In Figure 8A, these accelerated weathering standard values ​​are shown with a dashed line.

[0046] In Figure 8B, the horizontal axis represents elapsed time (in hours), and the vertical axis represents the color difference ΔE. Similar to the gloss retention rate in Figure 8A, the accelerated weathering standards based on the Japanese Industrial Standards (JIS) "JIS K5660 Glossy Synthetic Resin Emulsion Paint" were set as "color difference ΔE of 3 or less after 160 hours" and "color difference ΔE of 3 or less after 400 hours." In Figure 8B, these accelerated weathering standard values ​​are shown with dashed lines.

[0047] As shown in Figures 8A and 8B, all of the test specimens, G-5, G-10, and G-20, along with test specimen G-0 which does not contain iron carbonate, meet the criteria for accelerated weathering, indicating that the deterioration of the coating performance related to weathering is suppressed.

[0048] Figure 9A is a graph showing the time change in 60-degree specular gloss of test specimen F during the weather resistance test. Figure 9B is a graph showing the time change in color difference ΔE during the weather resistance test of test specimen F.

[0049] In Figure 9A, the horizontal axis represents elapsed time (in hours), and the vertical axis represents 60-degree specular gloss.

[0050] In Figure 9B, the horizontal axis represents elapsed time (in hours), and the vertical axis represents the color difference ΔE. Based on the Japanese Industrial Standard (JIS) "JIS K5658 Grade 1 Weather-Resistant Topcoat Paints for Buildings," and taking into account the acceleration ratio of the super xenon accelerated weathering test that was conducted, the standard was set as "color difference ΔE of 3 or less after 833 hours." In Figure 9B, the standard value for this accelerated weathering test is shown with a dashed line.

[0051] Along with test specimen F-0, which does not contain iron carbonate, test specimen F-5 generally meets the standards of "JIS K5658 Grade 1 Weather-Resistant Topcoat Paint for Buildings," confirming that the deterioration of the coating performance related to weather resistance is suppressed. Furthermore, as shown in Figure 9A, when examining the change in the 60-degree specular gloss value for test specimens F-10, F-20, and F-30, it can be seen that there is no tendency for gloss to decrease due to deterioration of the coating film over time, and there is almost no change. In addition, from the color difference ΔE value in Figure 9B, it can be seen that the deterioration of the coating performance is suppressed not only for test specimen F-5 but also for test specimen F-10.

[0052] Although a detailed explanation of the results will be omitted, the paint 10 of this embodiment showed improved solar reflectivity in dark colors due to the addition of iron carbonate.

[0053] <Test 2: Water resistance, low temperature resistance, heat resistance> The water resistance, low-temperature resistance, and heat resistance of paint 10 were tested using test specimens G (test specimens G-0, G-5, G-10, and G-20) and F (test specimens F-0, F-5, F-10, F-20, and F-30). The water resistance, low-temperature resistance, and heat resistance were verified by confirming the resistance to repeated wet-cold-heat cycles based on the standards of the Japanese Industrial Standard (JIS) "JIS K5660 Glossy Synthetic Resin Emulsion Paint". Specifically, for water resistance, an immersion test in water was conducted for 18 hours at 20°C ± 2°C; for low-temperature resistance, for 3 hours at -20°C ± 2°C; and for heat resistance, for 3 hours at 50°C ± 3°C, with a total of 10 cycles conducted.

[0054] The test results showed that neither test specimen G nor test specimen F deteriorated due to immersion in water, low temperatures, or high temperatures, indicating that the decline in coating performance related to water resistance, low temperature resistance, and heat resistance was suppressed.

[0055] <Test 3: Coating adhesion> The adhesion properties of paint 10 were tested using test specimens G (test specimens G-0, G-5, G-10, and G-20) and test specimen F (test specimens F-0, F-5, F-10, F-20, and F-30). The adhesion properties of paint 10 were verified by conducting an adhesion test and observing the failure status of the test specimens coated on the slate substrate.

[0056] The test results showed that both specimen G and specimen F exhibited cohesive failure of the slate substrate, indicating good coating adhesion.

[0057] <Test 4: Ammonia gas removal performance> The ammonia gas removal performance of the paint 10 in this embodiment was verified by an ammonia gas removal performance test using the gas bag method with test specimens G (test specimens G-0, G-5, G-10, and G-20). In the gas bag method, a test specimen (in this case, test specimen G) is sealed in a gas bag, and ammonia gas with an ammonia concentration of approximately 50 ppm and a volume of 5 L is filled into the gas bag. Then, at predetermined elapsed times, 100 ml of ammonia gas is drawn from the gas bag using an ammonia gas detection tube, and the ammonia gas concentration is measured.

[0058] Figure 10 is a graph showing the change in ammonia concentration over time during the first ammonia gas removal performance test. Figure 11 is a graph showing the change in ammonia concentration over time during the fifth ammonia gas removal performance test.

[0059] In Figures 10 and 11, the horizontal axis represents elapsed time (in hours), and the vertical axis represents ammonia concentration (in ppm).

[0060] As shown in Figures 10 and 11, the ammonia gas removal performance was improved in all test specimens, including G-5, G-10, and G-20, along with test specimen G-0 which did not have iron carbonate added. This indicates that the addition of iron carbonate enabled the ammonia gas removal performance to be achieved.

[0061] ===Summary=== According to this specification, paints in the following embodiments are provided.

[0062] (Aspect 1) Embodiment 1 is a paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate.

[0063] According to the above-described embodiment, it is possible to reduce CO2 emissions related to the manufacture of paint and to achieve coating film performance equivalent to or better than that of paint without added iron carbonate.

[0064] According to this specification, a method for manufacturing paint in the following embodiments is provided.

[0065] (Aspect 2) Embodiment 2 is a method for manufacturing a paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, wherein the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate, and the paint is manufactured by mixing the pigment, the additive, the solvent, the resin, and the iron carbonate.

[0066] According to the above-described embodiment, it is possible to reduce CO2 emissions related to the manufacture of paint and to achieve coating film performance equivalent to or better than that of paint without added iron carbonate.

[0067] (Aspect 3) In embodiment 3, the iron carbonate is produced by reacting carbon dioxide discharged from the factory with scrap iron.

[0068] According to the above-described embodiment, iron carbonate can be mass-produced industrially, and the CO2 emissions associated with the production of iron carbonate raw materials can be reduced to zero.

[0069] (Aspect 4) In embodiment 4, iron carbonate can be produced industrially on a large scale by adding ascorbic acid and manufacturing it in the atmosphere at room temperature and atmospheric pressure.

[0070] According to the above-described embodiment, the formation of iron carbonate particles can be easily promoted.

[0071] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. Furthermore, the present invention may be modified or improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. [Explanation of Symbols]

[0072] 10,10A Coating

Claims

1. It comprises a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate. A paint in which the mass of iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate.

2. A method for manufacturing a paint comprising a pigment, an additive containing an antibacterial agent, a solvent, a resin, and iron carbonate, The mass of the iron carbonate is 30% or less of the total mass of the pigment, the additive, the solvent, the resin, and the iron carbonate. A method for manufacturing paint, comprising mixing the aforementioned pigment, the aforementioned additive, the aforementioned solvent, the aforementioned resin, and the aforementioned iron carbonate.

3. The aforementioned iron carbonate is produced by reacting carbon dioxide emitted from a factory with scrap iron. A method for manufacturing paint according to claim 2.

4. The aforementioned iron carbonate is produced in air at room temperature and atmospheric pressure by adding ascorbic acid. A method for manufacturing paint according to claim 2 or 3.

Images