High antistatic floor coating and floor coating

Abstract

To provide a coating floor material which is excellent in finishing property, provides a cured coating film exhibiting high conductivity even at 25 V, and uses a carbon nanotube.SOLUTION: A coating floor material contains a normal temperature curable resin, a monolayer carbon nanotube, and an acrylic surface control agent, wherein the acrylic surface control agent is a surface control agent which increases surface free energy of a cured coating film, or a silicone free non-ionic surface control agent which improves wettability to a coated matter.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This disclosure relates to a floor coating material with enhanced antistatic properties. This disclosure also relates to a floor coating including a cured coating film of the said floor coating material. [Background technology]

[0002] Floor coatings using curable resins such as epoxy resins are widely used for the floors of factories and other production facilities. However, since the curable resins used in floor coatings are electrically insulating, a problem arises where static electricity can cause problems when working on the coated floor. Therefore, conductive fillers are added to the curable resin to impart antistatic properties to the floor coating. For example, Patent Document 1 describes the use of conductive titanium oxide powder and carbon fibers as conductive fillers. Patent Document 2 describes the use of carbon fibers as conductive fillers. Patent Document 3 describes the use of conductive metal oxides such as conductive zinc oxide and stainless steel fibers as conductive fillers.

[0003] The leakage resistance when grounding static electricity accumulated on the human body through a coated floor is 10 8 It is said that a resistance of around Ω is sufficient. Therefore, when measured with an applied voltage of 500V, the resistance of an antistatic floor coating should be 10 8 It has conductivity of Ω or less. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2013-40446 [Patent Document 2] Japanese Patent Publication No. 2017-48333 [Patent Document 3] Japanese Patent Publication No. 2016-223252 [Overview of the project] [Problems that the invention aims to solve]

[0005] On the other hand, in production facilities and other similar environments, electrostatic discharge (ESD) damage, such as the destruction of electronic components (e.g., semiconductor devices) at low voltages, can also occur. In contrast, conventional floor coatings have a sea-island structure in which a curable resin forms the sea phase and conductive fillers form the island phases. In a sea-island structure, current flows between the island phases with the sea phase in between, so a certain voltage or higher is required for conductivity. For this reason, conventional floor coatings do not exhibit conductivity at low voltages such as 25V, and cannot prevent ESD damage at such low voltages. Therefore, there is a need for the development of floor coatings that exhibit conductivity even at low voltages such as 25V.

[0006] One might consider adding a large amount of conductive filler to conventional floor coatings to improve conductivity. However, adding a large amount of conductive filler increases the viscosity of the floor coating, resulting in a poor finish and making it an impractical solution.

[0007] In the field of floor coatings, carbon black is used as a conductive material in conductive primers. However, because carbon black colors the coating black, it is not suitable for the base coat layer of floor coatings where aesthetic appeal is required.

[0008] On the other hand, carbon nanotubes are known as materials with high conductivity. However, as a result of the inventors' diligent research into applying carbon nanotubes to floor coatings, they found that carbon nanotubes cause viscosity to increase due to aggregation, resulting in problems such as the inability to obtain conductivity at low voltages, or even if conductivity at low voltages is obtained, pigment color separation occurs, resulting in a poor finish for the floor coating. Pigment color separation was particularly noticeable when using light-colored toners.

[0009] In light of these circumstances, this disclosure aims to realize a floor coating material using carbon nanotubes that has excellent finish and whose cured coating film exhibits high conductivity even at 25V. [Means for solving the problem]

[0010] This disclosure relates to a floor coating material containing a room-temperature curing resin, a single-walled carbon nanotube, and an acrylic surface modifier, wherein the acrylic surface modifier is a type of surface modifier that increases the surface free energy of the cured coating film, or a type of silicone-free nonionic surface modifier that improves wettability with the substrate. [Effects of the Invention]

[0011] According to this disclosure, it is possible to provide a floor coating material using carbon nanotubes that has excellent finish and the cured coating film exhibits high conductivity even at 25V. [Modes for carrying out the invention]

[0012] The floor coating material disclosed herein contains a room-temperature curing resin, single-walled carbon nanotubes, and an acrylic surface modifier as essential components. The acrylic surface modifier is a type of surface modifier that increases the surface free energy of the cured coating film, or a type of silicone-free nonionic surface modifier that improves wettability with the substrate. The floor coating material disclosed herein typically contains a pigment. The floor coating material disclosed herein may optionally contain various additives such as wetting dispersants, leveling agents, and defoamers. In this specification, the classification of various additives follows the usual classification in the paint field (particularly in the field of floor coatings).

[0013] [Room temperature curing resin] Room-temperature curing resins are resins that can be cured at room temperature (e.g., 0°C to 40°C, particularly 5°C to 35°C), which is the ambient temperature for application, and known resins for floor coatings can be used. As room-temperature curing resins, two-component curing types, moisture-curing types, and radical-polymerizable types can be used, with two-component curing types being preferred. Specific examples of room-temperature curing resins include epoxy resins, urethane resins, acrylic resins, polyester resins, and vinyl ester resins, with epoxy resins being preferred.

[0014] As for the epoxy resin, any known epoxy resin used for floor coatings can be used, and a two-component curing type that is liquid at room temperature and hardens upon reaction with a hardening agent is preferred.

[0015] Examples of epoxy resins include alicyclic epoxy resins such as 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate; glycidyl ester type epoxy resins such as hexahydrophthalic acid diglycidyl ester; bisphenol type epoxy resins derived from bisphenols such as bisphenol A and bisphenol F and epihalohydrins; epoxides of novolac resins such as phenol novolac resin, cresol novolac resin, bisphenol A novolac resin, naphthol novolac resin, and biphenyl novolac resin; glycidyl ether type epoxy resins derived from dihydric alcohols such as hydrogenated bisphenol F, hydrogenated bisphenol A, 1,4-cyclohexanedimethanol, and alkylene oxide adducts of bisphenol A and epihalohydrins; and epoxy resins derived from polyhydric phenols such as hydroquinone and catechol and epihalohydrins. Among these, bisphenol type epoxy resins (especially bisphenol A type epoxy resins) are preferred. These can be used individually or in combination of two or more types.

[0016] As a curing agent, those known for use in floor coatings can be used. Specific examples include aliphatic amines or modified versions thereof, such as diethylenetriamine, triethylenetetramine, and pentaethylenehexamine; aromatic amines or modified versions thereof, such as m-phenylenediamine, m-xylenediamine, and diaminodiphenylmethane; alicyclic amines or modified versions thereof, such as 1,3-bis(aminomethyl)cyclohexane and isophoronediamine; acid anhydrides such as phthalic anhydride, hexahydrophthalic anhydride, and pyromellitic anhydride; polysulfides; acid amides; thiocol, etc. Among these, alicyclic amines, aromatic amines, and their modified versions are preferred. Examples of modified versions include Mannich modified versions and Adduct modified versions. These can be used individually or in combination of two or more.

[0017] The mixing ratio of epoxy resin to hardener should be set as before, so that the molar amount of epoxy groups in the epoxy resin and the molar amount of active hydrogen in the hardener are approximately equal. When using the reactive diluent described later, the ratio should be set so that the total molar amount of epoxy groups in the epoxy resin and the reactive diluent is approximately equal to the molar amount of active hydrogen in the hardener.

[0018] [Single-walled carbon nanotubes] In the present disclosure, single-walled carbon nanotubes (SWNTs) are used as the conductive filler. The SWNT has a structure in which a single graphene sheet is wound in a cylindrical shape. The single-walled carbon nanotube may be any of an armchair type, a zigzag type, and a chiral type. Since it can be easily dispersed in the coating floor material, it is preferable to use a pre-dispersed one as the single-walled carbon nanotube. In particular, it is preferable to use a pre-dispersed one in a diluent having reactivity with a room-temperature curable resin. The single-walled carbon nanotube can be synthesized according to a known method and is also available as a commercial product. A suitable example of the pre-dispersed single-walled carbon nanotube is "TUBALL MATRIX201" manufactured by OCSIAL. This "TUBALL MATRIX201" contains a glycidyl fatty acid ester as a reactive diluent. Therefore, when an epoxy resin is used as the room-temperature curable resin, the glycidyl fatty acid ester can react with the curing agent together with the epoxy resin.

[0019] The content of the single-walled carbon nanotube in the coating floor material is not particularly limited, but if it is too low, the conductivity may be insufficient. Therefore, the content of the single-walled carbon nanotube in the coating floor material (that is, based on the total mass of the coating floor material; when the room-temperature curable resin is a two-component type, based on the total mass of the coating floor material including the mass of the curing agent) is preferably 0.010% by mass or more, more preferably 0.015% by mass or more, and still more preferably 0.020% by mass or more. On the other hand, if the content of the single-walled carbon nanotube in the coating floor material is too high, it may cause thickening of the coating floor material and impair the finishability. Therefore, the content of the single-walled carbon nanotube in the coating floor material is preferably 0.040% by mass or less, more preferably 0.035% by mass or less, and still more preferably 0.030% by mass or less.

[0020] [Acrylic surface conditioner] In the present disclosure, a specific type of acrylic surface conditioner is used. In the paint field, various surface conditioners such as silicone-based and vinyl-based ones are known. When a vinyl-based surface conditioner is used for a coated flooring material containing carbon nanotubes, the effect of uniformizing the surface tension of the coating film is high, and color separation is unlikely to occur in the cured coating film. However, the vinyl-based surface conditioner has a strong interaction with carbon nanotubes, causing aggregation of the carbon nanotubes and resulting in insufficient conductivity of the cured coating film at 25V. Conversely, when a silicone-based surface conditioner is used for a coated flooring material containing carbon nanotubes, hardly any effect of uniformizing the surface tension of the coating film is obtained, and color separation occurs in the cured coating film.

[0021] In contrast, in the present disclosure, a specific type of acrylic surface conditioner is used. Specifically, at least one of (A) a surface conditioner of a type that raises the surface free energy of the cured coating film (hereinafter also referred to as "acrylic surface conditioner (A)"), and (B) a silicone-free nonionic surface conditioner of a type that improves the wettability with the object to be coated (hereinafter also referred to as "acrylic surface conditioner (B)") is used. By using such an acrylic surface conditioner, aggregation of the pigment can be suppressed, the occurrence of color separation can be reduced, and excellent finishability can be exhibited even when a light-colored toner is used. In addition, these acrylic surface conditioners have little interaction with carbon nanotubes, and the dispersion state of the carbon nanotubes becomes good, so that the cured coating film can exhibit high conductivity (especially on the order of 10 5 Ω) even at 25V.

[0022] In the acrylic surface conditioner (A), the wettability of the cured coating film is improved by raising the surface free energy of the cured coating film. The acrylic surface conditioner (B) is of a type that improves the wettability with the object to be coated. Therefore, it is considered that this effect of improving the wettability affects the dispersion of the pigment and the carbon nanotubes, contributing to the reduction of the occurrence of color separation and high conductivity.

[0023] Whether an acrylic-based surface modifier increases the surface free energy of a cured coating film is determined based on common technical knowledge in the field of surface modifiers for paints. In particular, surface modifiers that increase the surface free energy of a cured coating film are described as having a surface free energy-increasing effect in product catalogs in the field of surface modifiers for paints.

[0024] Examples of acrylic surface modifiers (A) include acrylic surface modifiers in which highly polar side chains are grafted onto a low-polarity acrylic main chain. A specific example is Kusumoto form Examples include Disparon SEI-W01 and Disparon SEI-W02 manufactured by the company, with Disparon SEI-W01 being preferred.

[0025] Acrylic surface modifier (B) is a silicone-free nonionic surface modifier and therefore does not contain chemical structures with silicone bonds or chemical structures containing ions.

[0026] Whether an acrylic-based surface modifier improves wettability with the substrate is determined based on common technical knowledge in the field of surface modifiers for paints. In particular, surface modifiers that improve wettability with the substrate are described as having a wettability-improving effect in product catalogs in the field of surface modifiers for paints.

[0027] Examples of acrylic surface modifiers (B) include Kusumoto form Examples include the company's "L-1980N" series (e.g., L-1980N, L-1982N, L-1983N, L-1984N), with L-1982N and L-1983N being particularly preferred.

[0028] These acrylic surface modifiers can be used individually or in combination of two or more types.

[0029] The content of acrylic surface modifiers in the floor coating material is not particularly limited, but if the content of acrylic surface modifiers is too low, the effect of reducing color separation may not be sufficiently obtained. For this reason, the content of acrylic surface modifiers in the floor coating material is preferably 0.15% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more. On the other hand, if the content of acrylic surface modifiers is too high, the surface modifiers may form a thin film on the coating surface, resulting in insufficient conductivity. For this reason, the content of acrylic surface modifiers in the floor coating material is preferably 3.0% by mass or less, more preferably 2.5% by mass or more, and even more preferably 2.0% by mass or less.

[0030] [Pigments] The floor coatings disclosed herein typically contain pigments for purposes such as color adjustment. However, floor coatings may also exist in which the product does not contain pigments, and pigments are added to the product after use. Therefore, the floor coatings disclosed herein do not need to contain pigments.

[0031] As the pigment, any known pigment used in floor coatings may be used. The pigment may also be used in the form of a toner. The pigment content should be set appropriately according to the type of pigment and the desired color tone.

[0032] [Wetting and dispersing agent] The floor coating material disclosed herein may contain a wetting and dispersing agent for purposes such as improving the dispersion state of carbon nanotubes and enhancing the finish. A wetting and dispersing agent is an additive in the paint field that combines the functions of a wetting agent, which acts as a surfactant to improve the wettability of the coating film, and a dispersing agent, which prevents particle aggregation through mechanisms such as electrical repulsion and steric hindrance.

[0033] As a wetting and dispersing agent, a polymer salt containing acidic and amino groups is preferred. By using such a wetting and dispersing agent, aggregation of single-walled carbon nanotubes in the floor coating material can be more effectively prevented, and the deterioration of the finish due to thickening can be further suppressed.

[0034] As the acidic group, an acidic phosphate ester group is preferred. The polymer of the polymer salt may be a homopolymer or a copolymer. The polymer is preferably a graft copolymer in which one or more side chains (e.g., polyester chains) are introduced into the main chain (e.g., polyurethane chain). In this case, the steric hindrance of the polymer chains further improves the dispersibility of the single-walled carbon nanotubes. As the polymer salt, alkylammonium salts and phosphate ester salts are preferred, with alkylammonium salts being more preferred.

[0035] The wetting dispersant is preferably of an acid value and amine value of 10 mg KOH / g or higher, respectively. From the viewpoint of storage stability, it is more preferable that the acid value and amine value of the wetting dispersant are 30 mg KOH / g or higher, and even more preferable that they are 35 mg KOH / g or higher, respectively. The acid value represents the acid value per gram of polymer dispersant solids and can be determined, for example, by potentiometric titration in accordance with JIS K0070. The amine value represents the amine value per gram of polymer dispersant solids and can be determined, for example, by using a 0.1 N hydrochloric acid aqueous solution and converting the value obtained by potentiometric titration to the equivalent amount of potassium hydroxide.

[0036] Examples of wetting and dispersing agents that are polymer salts containing acidic and amino groups include "BYK-9076" and "DISPERBYK-142" from BIC Chemie Japan, and "Disparon DA-325" from Kusumoto Chemical Co., Ltd., with "BYK-9076" and "DISPERBYK-142" being preferred. Wetting and dispersing agents can be used individually or in combination of two or more.

[0037] The content of the wetting and dispersing agent in the floor coating material is not particularly limited, but if it is too low, sufficient conductivity may not be obtained. Also, a higher content of the wetting and dispersing agent tends to result in higher storage stability. For this reason, the content of the wetting and dispersing agent in the floor coating material is preferably 0.04% by mass or more, more preferably 0.10% by mass or more. On the other hand, if the content of the wetting and dispersing agent in the floor coating material is too high, conductivity may decrease. For this reason, the content of the wetting and dispersing agent in the floor coating material is preferably 0.40% by mass or less, more preferably 0.32% by mass or less, and even more preferably 0.25% by mass or less.

[0038] [Leveling agent] The floor coating material disclosed herein may contain a leveling agent for purposes such as further improving the finish. The leveling agent is typically miscible in the paint or in the form of oil droplets, but during the film formation process it becomes oil droplet-like and oriented on the film surface, which homogenizes the evaporation of the solvent from the film surface, prevents the formation of Benard cells, reduces changes in surface tension, and smooths the surface.

[0039] As a leveling agent, any agent that does not fall under the above-mentioned specific types of acrylic surface modifiers may be used, and known agents used in floor coatings may be used. Examples of leveling agents include acrylic polymers. As a leveling agent, the "Polyflow" series manufactured by Kyoeisha Chemical Co., Ltd. may be used. Leveling agents can be used individually or in combination of two or more types.

[0040] The amount of leveling agent in the floor coating material is not particularly limited, but if it is too little, the finish may deteriorate. Therefore, the amount of leveling agent in the floor coating material is preferably 0.04% by mass or more, more preferably 0.06% by mass or more, and even more preferably 0.07% by mass or more. On the other hand, if the amount of leveling agent in the floor coating material is too much, the conductivity may become insufficient. Therefore, the amount of leveling agent in the floor coating material is preferably 0.21% by mass or less, more preferably 0.18% by mass or less, and even more preferably 0.15% by mass or less.

[0041] [Antifoaming agent] The floor coating material disclosed herein may contain an antifoaming agent for purposes such as further improving the finish. The antifoaming agent used may not fall under the category of the specific acrylic surface modifiers mentioned above, and may be a known antifoaming agent used in floor coating materials. Examples of antifoaming agents include acrylic polymers, vinyl ether polymers, and mixtures thereof. The "Florence" series manufactured by Kyoeisha Chemical Co., Ltd. may be used as the antifoaming agent. The antifoaming agent may be used alone or in combination of two or more types.

[0042] The amount of defoaming agent in the floor coating material is not particularly limited, but if it is too little, the finish may deteriorate. Therefore, the amount of defoaming agent in the floor coating material is preferably 0.12% by mass or more, more preferably 0.18% by mass or more, and even more preferably 0.24% by mass or more. On the other hand, if the amount of defoaming agent in the floor coating material is too much, the conductivity may become insufficient. Therefore, the amount of defoaming agent in the floor coating material is preferably 0.40% by mass or less, more preferably 0.38% by mass or less, and even more preferably 0.36% by mass or less.

[0043] [Other optional ingredients] The floor coating material disclosed herein may contain insulating fillers for the purpose of improving strength, colorability, etc. Known insulating fillers used in floor coating materials may be used. Examples include calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide, magnesium oxide, alumina, silica, kaolin, talc, mica, glass beads, glass microballoons, glass fibers, etc., with calcium carbonate (especially heavy calcium carbonate) being preferred. The content of the insulating filler may be appropriately set according to the desired strength, etc.

[0044] The floor coating material of this disclosure may contain reactive diluents, non-reactive diluents, etc., for the purpose of adjusting viscosity, etc. Examples of reactive diluents include compounds having one or more reactive groups of the same type as the room-temperature curing resin. Specifically, for example, if the room-temperature curing resin is an epoxy resin, compounds having epoxy groups such as neopentyl glycol diglycidyl ether and tolylglycidyl ether can be used. Examples of non-reactive diluents include compounds that do not have the same type of reactive groups as the room-temperature curing resin. Specifically, for example, if the room-temperature curing resin is an epoxy resin, benzyl alcohol, etc. can be used. The content of these can be appropriately set according to the desired viscosity, etc.

[0045] The floor coating material of this disclosure may further contain components other than those mentioned above, to the extent that they do not significantly impair the effects of this disclosure.

[0046] There are no particular restrictions on the method of preparing the floor coating material disclosed herein, and it can be prepared according to known methods. For example, each component of the floor coating material disclosed herein may be mixed and prepared at the construction site or elsewhere. For example, the floor coating material disclosed herein may be a two-component type, consisting of a main component containing components other than the hardener and a hardener, and may be prepared as a type that is mixed at the construction site or elsewhere before use. For example, a two-component type may be prepared, with the main component containing no insulating filler, or only a small amount, and the insulating filler may be added to the main component at the construction site or elsewhere to achieve a mixing ratio determined by considering the condition of the substrate and the properties required for the floor coating. For example, a two-component type may be prepared, with the main component containing no colorant, and the colorant may be added to the main component at the construction site or elsewhere according to the color tone required for the floor coating.

[0047] The floor coating material of this disclosure can be used by applying it according to known methods. For example, the floor coating material of this disclosure can be applied to the floor to be coated by a pouring method, and then left to stand for a predetermined time to dry and allow the epoxy resin to harden, thereby forming a floor coating. The applied floor coating may be a single layer formed by the floor coating material of this disclosure (i.e., a layer of the hardened coating film of the floor coating material of this disclosure), or it may be a multi-layer structure combining a layer formed by the floor coating material of this disclosure and a primer layer.

[0048] According to the floor coating material of this disclosure, the occurrence of color separation is suppressed by adding a specific type of acrylic surface modifier to a room-temperature curing resin and single-walled carbon nanotubes. As a result, even when using light-colored toners, an excellent finish (especially a finish with superior aesthetic appeal) can be obtained. Furthermore, according to the floor coating material of this disclosure, by adding a specific type of acrylic surface modifier to a room-temperature curing resin and single-walled carbon nanotubes, the cured coating film exhibits high conductivity even at 25V. In particular, the resistance at 25V is 10 5 Conductivity on the order of ohms can also be achieved. Therefore, the floor coating material of this disclosure has much higher antistatic performance than conventional materials (and can therefore be called a "high antistatic floor coating material"), and can prevent not only conventional antistatic properties but also electrostatic damage such as the destruction of electronic components (e.g., semiconductor elements) at low voltages.

[0049] Therefore, this disclosure, from another perspective, is a floor coating comprising a cured coating film of the above-mentioned floor coating material. The thickness of the cured coating film of the above-mentioned floor coating material is not particularly limited, but is, for example, 1.0 mm or more and 3.0 mm or less, preferably 1.0 mm or more and 2.0 mm or less. The floor coating may have other layers such as a primer layer.

[0050] For example, if the floor coating of this disclosure is an antistatic floor coating, the floor coating may include three layers: a primer layer, a conductive primer layer, and a base coat layer. The primer layer is a layer for ensuring adhesion to the surface of a substrate such as concrete, and may have the same configuration as known primer layers. The primer layer can be formed using, for example, a known epoxy resin floor coating paint for primers (e.g., Sumitomo Rubber Industries, Ltd.'s "C355" (main component) and "H355" (hardener)).

[0051] The conductive primer layer may have a configuration similar to that of known conductive primer layers, typically, for example, 10 3 The conductive primer layer is configured to have conductivity of approximately Ω. The conductive primer layer can be formed using, for example, a known conductive primer floor coating (e.g., Sumitomo Rubber Industries' "SL333A" (main component) and "SL333B" (curing agent)) which imparts conductivity by compounding carbon black into an epoxy resin.

[0052] The base coat layer is composed of the hardened coating film of the floor coating material mentioned above.

[0053] The floor coating of this disclosure has a good finish and exhibits high conductivity even at 25V. Therefore, electrostatic discharge (ESD) damage, such as the destruction of electronic components at low voltages, is prevented. The floor coating of this disclosure can be used in various types of buildings and is particularly suitable for research and production facilities for electronic components (e.g., semiconductor devices). [Examples]

[0054] The following describes examples relating to this disclosure, but this disclosure is not intended to be limited to those shown in such examples.

[0055] [Examples and Comparative Examples] Each component listed in Table 1, excluding the surface modifier, was mixed using a stirrer at a rotation speed of 1300 rpm for 10 minutes. Then, the surface modifier listed in Table 1 was added and mixed at a rotation speed of 1300 rpm for 5 minutes to prepare the main component (the values ​​in the table represent parts by mass). However, in Comparative Example 1, no surface modifier was added to the main component. Under conditions of a temperature of 23±1℃ and a relative humidity of 55±1%, the prepared main component was mixed with a hardener and stirred with a stirrer. In this way, the floor coatings for the examples and each comparative example were prepared.

[0056] [Evaluation of conductivity] Primer layer and conductive primer layer (resistance: approximately 10 3 The floor coatings of each example and comparative example prepared above were applied to a flat plate formed with Ω. These were then left to cure for 7 days in an environment of 23±1℃ and 55±1% relative humidity to prepare test samples. The resistance of these test samples was measured using an insulation resistance meter with an applied voltage of 25V, in accordance with the NFPA method and JIS A1454:2016. A 2.25kg iron cylinder was used as the electrode, with a distance of 3 feet (approximately 91cm) between the electrodes. The measurement results are shown in Table 1.

[0057] [Evaluation of finished product condition] The floor coatings for each example and comparative example prepared above were applied to a 30cm square flat plate. These were then left to cure for 7 days in an environment of 23±1℃ and 55±1% relative humidity to prepare test samples. The surface of the test samples was illuminated with fluorescent light to check for color separation. The color separation was evaluated according to the following criteria, with a circle (〇) indicating a pass. The results are shown in Table 1. ×: Many color divisions are observed. △: There is a slightly higher degree of color separation. ○: Slight or almost no color separation is visible.

[0058] [Table 1]

[0059] Polyflow No. 85: Leveling agent "Polyflow No. 85" manufactured by Kyoeisha Chemical Co., Ltd. Floren AC324: An antifoaming agent manufactured by Kyoeisha Chemical Co., Ltd. MATRIX201: OCSIAL's "TUBALL MATRIX201" (contains single-walled carbon nanotubes and fatty acid glycidyl ester (reactive diluent) in a mass ratio of 1:9) BYK-9076: A wetting and dispersing agent manufactured by BYK-Chemie Japan Co., Ltd. (Alkylammonium salt of a polymer in which polyester chains are grafted onto a polyurethane main chain; Acid value = 38 mg KOH / g, Amine value = 44 mg KOH / g) L-1982N: Kusumoto form Our company's acrylic surface conditioning agent "L-1982N" L-1983N: Kusumoto form Our company's acrylic surface conditioning agent "L-1983N" SEI-W01: Kusumoto form SEI-W01, an acrylic surface conditioner manufactured by our company. BYK-326: A silicone-based surface conditioner manufactured by Big Chemie Japan Co., Ltd. BYK-329: A silicone-based surface conditioner manufactured by Big Chemie Japan Co., Ltd. P-450N: Kusumoto form Our company's vinyl-based surface conditioner "P-450N"

[0060] Examples 1 to 3, which contain a room-temperature curing resin, single-walled carbon nanotubes, and an acrylic surface modifier, exhibited good finish and a performance of 10 at 25V. 5 High conductivity on the order of ohms was obtained. On the other hand, in Comparative Example 1, where no surface modifier was used, although conductivity was high, a lot of color separation was observed and the finish was poor. In Comparative Examples 2 and 3, where a silicone-based surface modifier was used, the dispersion state of the single-walled carbon nanotubes was good, and at 25V, 10 5A high conductivity on the order of Ω was obtained. However, the pigment aggregated and there was a lot of color separation, resulting in poor finish quality. In Comparative Example 4 using a vinyl-based surface conditioner, almost no color separation was observed and the finish quality was good. However, it had a high resistance of 10 9 Ω or more at 25V, and the conductivity was low.

[0061] From the above results, it can be seen that according to the coated floor material of the present disclosure, a coated floor material using carbon nanotubes with excellent finish quality and a cured coating film showing high conductivity even at 25V can be provided.

[0062] That is, the present disclosure (1) is a coated floor material containing a room temperature curing resin, single-walled carbon nanotubes, and an acrylic-based surface conditioner, wherein the acrylic-based surface conditioner is a type of surface conditioner that raises the surface free energy of the cured coating film or a silicone-free nonionic surface conditioner that improves the wettability with the coated object.

[0063] The present disclosure (2) is the coated floor material according to the present disclosure (1), wherein the content of the acrylic-based surface conditioner is 0.15% by mass or more and 3.0% by mass or less.

[0064] The present disclosure (3) is the coated floor material according to the present disclosure (1) or (2), wherein the content of the single-walled carbon nanotubes is 0.010% by mass or more and 0.040% by mass or less.

[0065] The present disclosure (4) is a coated floor having a cured coating film of the coated floor material according to any one of the present disclosures (1) to (3).

Claims

1. A floor coating material containing a room-temperature curing resin, single-walled carbon nanotubes, and an acrylic-based surface modifier, The acrylic surface modifier is a type of surface modifier that increases the surface free energy of the cured coating film, or a silicone-free nonionic surface modifier that improves wettability with the substrate. The aforementioned room-temperature curing resin is a resin that can be cured at temperatures between 0°C and 40°C. The content of the acrylic surface modifier is 0.15% by mass or more and 3.0% by mass or less. The content of the single-walled carbon nanotubes is 0.010% by mass or more and 0.040% by mass or less. Floor coating material.

2. The floor coating material according to claim 1, further comprising 0.04% by mass or more and 0.40% by mass or less of a wetting dispersant which is a polymer salt containing an acidic group and an amino group.

3. The floor coating material according to Claim 1, further comprising 0.04% by mass or more and 0.40% by mass or less of a wetting dispersant which is a polymer salt containing an acidic group and an amino group, 0.04% by mass or more and 0.21% by mass or less of a leveling agent, and 0.12% by mass or more and 0.40% by mass or less of an antifoaming agent.

4. A floor coating comprising a cured coating film of the floor coating material described in claim 1.

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