JPH05306375A - Coating material for electrically conductive floor and electrically conductive flooring material - Google Patents

Abstract

PURPOSE:To obtain a white or bright colored coating material for an electrically conductive floor and an electrically conductive flooring material having a high strength and stably sufficient electric conductivity with hardly any discoloration and fading with light such as ultraviolet rays. CONSTITUTION:The coating material comprises 100 pts.wt. binder and 1-500 pts.wt. zinc oxide whisker having 3-200mum length from the base to the tip. The zinc oxide whisker is capable of extremely effectively imparting electric conductivity and has both good mechanical and electrical characteristics. Since the zinc oxide whisker is white and hardly discolors with ultraviolet rays, etc., this material has further good designability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive floor coating material and a conductive floor material. More specifically, it is used for removing static electricity in clean rooms, semiconductor factories, hospital operating rooms, floors for other precision machines and computers. The present invention relates to a conductive floor coating material and a conductive floor material used for the above purpose.

[0002]

2. Description of the Related Art In order to prevent electrostatic damage, 10 ⁹
Resistance value of almost semiconductor region of Ω or less (especially 10 ⁵ to 10 ⁹
Ω is appropriate). Conventionally, in order to impart antistatic properties to floor materials, a method has been adopted in which various conductive fillers are mixed into a coating material forming a coating layer to reduce the resistance value.

When the conductive fillers are listed, those having a powdery (flake) shape are conductive carbon black, graphite, metal oxides (tin oxide or zinc oxide), metal powders (aluminum, copper, silver). ), Etc., and in the fibrous form, carbon fiber, metal fiber, metal coated fiber, conductive potassium titanate whisker (manufactured by Otsuka Chemical Co.,
BK series, etc .: black), and conductive potassium titanate whiskers (manufactured by Otsuka Chemical Co., Ltd., WK series, etc .: white), in which the surface of insulating potassium titanate whiskers is coated with tin oxide / antimony fine particles. .. In addition, there were granular aluminum and stainless grids.

The present inventors previously proposed a conductive resin film using zinc oxide whiskers, which is a novel conductive filler.

[0005]

However, none of the above-mentioned conventional floor coating materials or floor materials provided with antistatic performance satisfy the various characteristics.

First, the one using a conductive filler having a black color tone (carbon-based and black-based conductive potassium titanate whiskers) has a drawback that the coating floor material cannot be colored.

Next, the one using a metal-based conductive filler has a drawback that the conductivity is changed by oxidation, and the silver powder is expensive.

Further, carbon fibers and metal fibers have problems in dispersibility in addition to the above drawbacks.

Next, as a white conductive filler which can be easily colored, powdery metal oxide and fibrous (whisker) are used.
Conductive potassium titanate whiskers (WK series). However, it is necessary to add an extremely large amount of powdery metal oxide to obtain conductivity, and if it is a small amount, it will settle in the coating film and the insulating layer (skin layer) will be formed on the coating surface (upper surface). However, it was impossible to form a conductive path and the conductivity could not be secured.

Further, when a large amount is added to the coating material, the mechanical properties of the floor material are extremely deteriorated, and the floor material is vulnerable to crack generation, impact and load.

Further, a tin oxide-based conductive filler is often used as the white conductive filler, but this tin oxide-based conductive filler is discolored (gradually darkened) when exposed to light (especially ultraviolet rays). The material had a fatal defect. Examples of this kind of conductive filler include tin oxide powder and conductive potassium titanate whiskers (white type).

In view of the above problems, the present invention provides white,
Alternatively, it is an object of the present invention to provide a conductive floor coating material and a conductive floor material that are bright-colored and have little discoloration or fading due to light such as ultraviolet rays and the like.

[0013]

The electrically conductive floor coating material of the present invention contains 1 to 500 parts by weight of a zinc oxide whisker having a length from the base to the tip of 3 to 200 μm with respect to 100 parts by weight of the binder. It is characterized by

As the binder, an organic binder, an inorganic binder, and an inorganic cement and an organic binder are used.
Further, as the zinc oxide whisker, a tetrapot-shaped one having a core portion and needle-shaped crystal portions extending in different four-axis directions from the core portion is used, whereby a more excellent effect is produced.

Further, in the conductive flooring material of the present invention, at least a part of the coating layer is a zinc oxide whisker having a length from the base to the tip of 3 to 200 μm with respect to 100 parts by weight of the binder.
It is characterized by comprising a conductive floor coating material containing up to 500 parts by weight.

The conductive flooring material may be of various types such as a conductive coating flooring material. That is, the coating layer of the floor material, terrazzo type, resin mortar type, flow spread type,
In addition, a coating type is suitable.

[0017]

The zinc oxide whiskers preferably used in the present invention are white conductive powders (three-dimensional tetrapod-like fibrous bodies) as shown in FIG. Therefore, when this zinc whisker is used as a floor coating material, the following optimum conductive floor coating material is provided.

Since it becomes a white filler, a floor material of any color can be realized. Also, zinc oxide is a material that is strong against ultraviolet rays,
Its whiteness does not change with time due to light such as ultraviolet rays.

On the contrary, the zinc oxide whiskers themselves are materials that strongly absorb ultraviolet rays, and have the effect of suppressing the ultraviolet deterioration of the entire floor material.

On the other hand, the conductivity of zinc oxide whiskers is
It is electrically conductive due to the semiconductor described as O: Zn, is electrically conductive, and is extremely stable. Furthermore, when prepared as a coating material, it has the optimum conductivity (10 ⁶ to 10 ^{9) for} antistatic floor materials.
Ω / □).

The conductivity imparting mechanism of this zinc oxide whisker is that the three-dimensional tetrapot shape acts extremely effectively to form a conductive path, as shown in FIG. As shown in (b) of, for example, in the case where the same amount of simple granular zinc white is added, it is difficult to form the conductive path, while it is possible to form the conductive path with an extremely small amount. Not a very effective conductivity enhancer.

Further, since complete sedimentation such as a powdery filler is unlikely to occur, even if added in a small amount, a skin layer is not formed and the conductivity of the coating film is effectively secured.

Next, the flooring material containing the tetrapot-shaped zinc oxide whiskers is a flooring material excellent in load resistance and impact resistance due to the micro-reinforcing effect of the whiskers and the buffering effect which is considered to be attributable to the shape of the tetrapots. Become.

[0024]

EXAMPLES Examples of the present invention will be described below, but it goes without saying that the present invention is not limited to the following examples.

Although not limited in the present invention, a tetrapot-shaped zinc oxide whisker is used as the zinc oxide whisker (an electron micrograph of an example thereof is shown in FIG. 1).
By using, preferable results can be obtained. In addition, a simple needle-shaped zinc oxide whisker can be used.

This tetrapot zinc oxide whisker is
For example, a particle size of 0.1 to 300μ having an oxide film on the surface
m, preferably 1 to 200 μm, more preferably 10
Metallic zinc powder of 150 μm is 700 to 1100 ° C., preferably 8 in an atmosphere containing oxygen with an oxygen concentration of several percent or less.
00-1050 ° C, more preferably 900-1000
It can be generated by heating at 10 ° C. for 10 seconds or longer, preferably 30 seconds to 1 hour, more preferably 1 minute to 30 minutes. The obtained zinc oxide whiskers usually have an apparent bulk specific gravity of 0.02 to 0.5, and have a yield of 70 wt% or more, and are extremely highly producible.

When the X-ray diffraction pattern of this whisker was taken, all peaks of zinc oxide were usually shown, while the results of electron diffraction also showed single crystallinity with few transitions and lattice defects. Also,
The content of impurities was also small, and as a result of atomic absorption spectrometry, zinc oxide was 99.98%. However, it is not necessarily limited to this.

By the way, the needle-shaped crystal part of the zinc oxide whisker may be mixed with triaxial, biaxial, and even uniaxial in addition to the tetraaxial whisker. It was broken. It is also recognized that zinc oxide in plate form is mixed.

The tetrapot-shaped zinc oxide whiskers may be produced by using a molten metal of zinc metal as a starting material, and the present invention does not necessarily depend on the method for producing the tetrapot-shaped zinc oxide whiskers. Of course.

A method for producing a simple acicular zinc oxide whisker is already known, and these zinc oxide whiskers may be used.

In the present invention, the length from the base to the tip of the needle-shaped crystal portion is 3 μm or more and 200 μm or less. In particular, the length is preferably in the range of 5 to 100 μm, more preferably 5 to 50 μm, and further preferably 10 to 30 μm. Zinc oxide whiskers shorter than 3 μm are not preferable from the viewpoint of efficiency of imparting conductivity and mechanical reinforcing effect.

On the other hand, zinc oxide whiskers having a length of more than 200 μm are not always preferable from the viewpoint of obtaining surface smoothness of the floor coating material and uniform and stable conductivity.

Next, the diameter of the base of the zinc oxide whisker is 0.
1 to 14 μm is preferable, and 0.7 to 8 μm is particularly preferable.

Further, the aspect ratio (= length / diameter of the base portion) of the zinc oxide whiskers is preferably 3 to 100, and particularly preferably 5 to 20. By the way, the length of a tetrapod-shaped zinc oxide whisker is measured with one needle crystal out of four needle crystals. In this case, the needle-shaped crystal portion near the tetrapod-shaped core is referred to as a base.

Next, the conductivity of zinc oxide whiskers will be described.

The conductivity of zinc oxide whiskers generally appears as a property of a semiconductor represented by ZnO: Zn, and the conductivity greatly varies depending on the generation method and generation conditions.

Further, similar to general zinc oxide, it is possible to increase the conductivity by doping aluminum or the like by various methods, while the conductivity can be lowered by doping copper or the like, and the conductivity can be reduced. Can be controlled.

In the present invention, although not particularly limited, zinc oxide whiskers having a resistance value in the range of 10 ² to 10 ¹¹ Ω-cm can be preferably used. Furthermore, 10 ⁶ to 10 ¹⁰ Ω
-Cm zinc oxide whiskers are more preferable, especially 10 ⁷ to
The zinc oxide whisker of 10 ⁹ Ω-cm has high mass productivity and is advantageous in terms of productivity, and the resistance value of the floor coating material is just “electrostatic diffusion level”, and the whiteness is extremely high. Is the optimum zinc oxide whisker.

The method for measuring the resistance value of the zinc oxide whisker used in the present invention is as follows.

First, 0.5 g of zinc oxide whiskers was sampled and evenly sandwiched between flat plate electrodes (pair) having a diameter of 20 mm.
A pressure of kg / cm ² is evenly applied to the sample. Next, the resistance between the pair of flat plate electrodes is measured by a super insulation resistance meter (HP, High Re
sistance meter 4329A) with a measuring voltage of 25
Read with V. Next, the zinc oxide whisker dust powder sample was taken out, the sample thickness was measured with a caliper, and the volume resistance value P was calculated from the sample thickness and the sample area (3.14 cm ² ) and the resistance value obtained previously. Ask. At this time, the following formula is used.

P [Ω-cm] = R · S / t where R [Ω]: resistance value S [cm ² ]: sample area t [mm]: sample thickness However, the measurement conditions are 25 ° C. 40% RH.

Next, as the binder, an organic or inorganic binder, or a binder in which an inorganic cement and an organic binder are used in combination is applied.

The organic binder in the present invention may be an organic binder which is usually used as a flooring material or a coating material for flooring material. For example, one or a mixture of acrylic resin, epoxy resin, urethane resin, alkyd resin, polyester resin, ethylene vinyl acetate copolymer, fibrin resin, phenol resin, amino resin, etc., preferably at room temperature An example is one that has the property of forming a film with.

The above organic binders are usually preferably used in a solvent-free system from the viewpoints of preventing environmental pollution in the workplace and suppressing the volume reduction after film formation. In particular, if it is necessary to improve workability, it can be used in the form of a solution dissolved in an organic solvent or in the form of an aqueous emulsion.

Further, in the present invention, if desired, a colorant,
Dispersant, catalyst, co-catalyst, plasticizer, reactive diluent, reaction inhibitor, stabilizer (antioxidant, UV absorber, anti-aging agent), lubricant, reinforcing filler, non-reinforcing filler, It goes without saying that various commonly used additives such as flame retardants can be used in combination.

Examples of the reinforcing filler include glass fiber, glass flakes, glass beads, asbestos, talc, mica, calcium carbonate and various whiskers.
As the non-reinforcing filler, various aggregates, sand, natural crushed stone, clay, barium sulfate, aluminum hydroxide, alumina,
Examples thereof include titanium oxide, silica, white carbon and the like.

Examples of the colorant include titanium oxide, zinc oxide, red iron oxide, carbon black, graphite and the like. Next, as a stabilizer, first as an antioxidant, for example, a radical chain inhibitor represented by monobistriphenol, an aromatic amine, a peroxide decomposing agent such as mercaptan, monodipolysulfide, an acid amide, hydrazine, etc. Examples of the metal deactivators, phenols, sulfides, phosphides, and ultraviolet absorbers include benzophenone-based and benzotriazole-based compounds.

Examples of the flame retardant include phosphorus-based or bromine-based flame retardants, and flame retardant aids such as antimony oxide.

Examples of the lubricant include molybdenum disulfide, high density polyethylene, polytetrafluoroethylene (PTFE) and the like.

Next, examples of the inorganic binder in the present invention include various cements such as silicate, phosphate, borate, gypsum and other latex cement.

The conventionally known composition of a resin mortar composition can be applied to the present invention as it is, and in the present invention, the combined use of an aqueous resin and an aqueous emulsion is particularly effective. Incidentally, also in the inorganic binder, a colorant,
Various commonly used cement additives such as an air entraining agent and a water reducing agent can be used in combination.

The zinc oxide whiskers used in the present invention are
The characteristics can be improved by surface-treating it with a suitable coupling agent which has been conventionally used, if necessary. As the coupling agent, for example, silane-based,
Examples thereof include chromium-based, titanium-based, silyl peroxide-based, and organic phosphoric acid-based, but silane coupling agents are particularly effective.

Further, in the present invention, there is no obstacle to the combined use or the mixture of the conductive fillers which have been conventionally used, if desired. That is, for example, zinc oxide whiskers and a conventional conductive filler are mixed and mixed in a binder, or a layer in which a conventional conductive filler is mixed in a binder and a layer in which zinc oxide whiskers are mixed in a binder are formed into multiple layers. Etc. are exemplified.

The present invention relates to a coating composition comprising zinc oxide whiskers and a binder, or a conductive floor covering coated with this composition. The coating method here is zinc oxide whiskers and a binder. A conductive sheet consisting of is prepared in advance, a method of adhering this sheet to the floor surface, or a method of applying a conductive coating material to the floor surface and then forming a film, etc., which is usually practiced The construction means is arbitrarily selected.

Next, as the flooring material, various types of flooring materials that have been conventionally used can be applied. For example, according to the type of the coating layer, a terrazzo type such as cement-based terrazzo or epoxy terrazo, a resin mortar type, and a floor spread type or coating type floor material are exemplified.

Next, the compounding ratio of the zinc oxide whiskers and the binder for obtaining the conductive coating material or the flooring material is such that the purpose of use, the shape and size of the zinc oxide whiskers, the kind of the binder and the filling used in combination. It is difficult to specify because it changes depending on the type and size of the agent, as well as the film thickness and type of coating layer, but if the compounding ratio of zinc oxide whiskers is too small, the reinforcing property will be poor and the conductivity will be unstable. On the other hand, if the compounding ratio of zinc oxide whiskers is too large, the bonding strength becomes insufficient and the strength of the flooring material decreases, so that a desirable compounding ratio necessarily exists. Therefore, the amount of zinc oxide whiskers is usually 1 to 500 parts by weight, preferably 5 to 200 parts by weight, and particularly preferably 10 to 50 parts by weight per 100 parts by weight of the binder.

Various means can be applied to the means for producing the conductive flooring material according to the present invention, depending on the purpose of use, the type of binder and the like. For example, without limitation, in the case of coating with a conductive coating material, the surface of the floor substrate after mixing or dispersing the zinc oxide whiskers and the binder with a commonly used mixer or disperser. The coating and film formation are carried out by a commonly used coating method such as flow coating, spray coating, brush coating, roller coating and iron coating. In this case, it is needless to say that a catalyst, a solvent, a dispersant, and other additives which are usually used can be added as required at the time of mixing, dispersing or coating.

The thickness of the conductive flooring material varies greatly depending on the purpose of use. For example, in the cement-based Terrazo type,
The coating film generally has a thickness of 15 to 30 mm, and the epoxy terrazo type coating film generally has a coating thickness of 7 to 15 mm. Further, the resin mortar type generally has a coating thickness of 4 to 6 mm, the flow spread type generally has a coating thickness of 1 to 2 mm, and the coating type has a coating thickness of 0.2 to 0.
4 mm is common.

Hereinafter, the embodiments of the present invention will be described with reference to specific examples.
It is not intended to limit the inventive idea. In particular, it should be understood that the technical scope of the present invention extends to wall materials and ceiling materials having the same purpose as the floor material.

Example 1 A metallic zinc powder having an oxide film on the surface and having a particle size of 50 to 150 μm was produced by heat treatment at 950 ° C. for 5 minutes in an atmosphere having an oxygen concentration of 1% or less. The resulting zinc oxide whiskers had an apparent bulk specific gravity of 0.06 on average and a resistance value of 2 × 10 ⁸ Ω-cm. This zinc oxide whisker is white and almost in the shape of a tetrapot, and the average size is such that the length from the base to the tip is distributed to 5 to 50 μm, and the diameter of the base is 0.7 to 8 μm.
m, and the aspect ratio was 5-20.

5 parts of this tetrapot-shaped zinc oxide whisker was used.
0 parts by weight, epoxy resin (Dow Chemical Company: DER:
165 parts by weight of epoxy equivalent 200) were kneaded for 3 minutes using a planetary mixer to obtain a white floor coating material in which zinc oxide whiskers were homogeneously dispersed in the epoxy resin. To this floor coating material, 100 parts by weight of a modified amine-based curing material (Fuji Kasei Kogyo Co., Ltd .: Fujicure: amine value 350) was added and homogeneously mixed in the same manner, and this mixture was prepared according to JIS R5201. A white (slightly brown) epoxy-based conductive flooring material was obtained by applying a trowel coating to the surface of the product to a thickness of 2 mm and curing at room temperature.

The surface leakage resistance of this floor material is 4 × 10 ⁸ Ω
(NFPA method), and showed stable conductivity sufficient for static electricity diffusion.

Next, this floor material was irradiated with ultraviolet rays (6 hours), and the presence or absence of discoloration of the floor material was examined. Almost no discoloration was observed. For irradiation with ultraviolet rays, a commercially available germicidal lamp (2
0 W; irradiation distance: 15 cm) was used.

(Comparative Examples 1 to 3) Instead of the zinc oxide whiskers of Example 1, other white conductive fillers were used to prepare flooring materials in exactly the same manner as in Example 1 and the results of evaluation are shown in Table 1. Shown in 1.

[0065]

[Table 1]

(Example 2) The coating material used in Example 1 was applied to the floor surface made of steel sheet by the same method as that used in Example 1 to obtain a white epoxy type floor material. At this time, the thickness of the coating film was 1 mm on average. Surface leakage resistance at this time is 5 ×
It was 10 ⁶ Ω and showed a sufficient electrostatic diffusion property. Also,
Almost no discoloration occurred in the ultraviolet irradiation test.

Example 3 A flow spreading type floor covering having the structure shown in FIG. 3 was prepared. Basically, general materials and construction methods that have been used conventionally were used. In FIG. 3, 1 is a steel plate, 2 is a sealer, 3 is a conductive primer, 4 is a conductive finishing material, and a conductive epoxy paint mixed with conductive carbon black and carbon fibers is used for the conductive primer 3 ( The thickness is 0.2 mm), and the conductive finishing material 4 has the first embodiment.
20% by weight of the tetrapod-shaped zinc oxide whiskers used in
A mixed solvent-free epoxy paint was used (coating thickness 1
mm). This coated flooring material had a cream color and good UV resistance. The surface leakage resistance is 7 × 10 ⁶ Ω
And showed a good electrostatic diffusion property.

Example 4 A mortar-type floor covering having the structure shown in FIG. 4 was prepared. Similarly, basically, the materials and the construction method conventionally used for the floor coverings of this type have been generally followed.

In FIG. 4, 5 is a conductive resin mortar,
Using resin mortar made conductive with carbon black,
It was applied with a trowel to a thickness of 4 mm. The conductive finishing material 4 used in Example 3 was a solventless epoxy paint highly whitened with titanium oxide, and was applied to a thickness of 2 mm using a trowel.

This floor material is highly white and has a surface leakage resistance of 8 ×.
It was 10 ⁶ Ω and showed a good electrostatic diffusion property.

Example 5 A cement-based terrazzo type floor covering having the structure shown in FIG. 5 was prepared. Basically, the materials and construction methods conventionally used for this type of floor covering have been followed. In FIG. 5, 6 is a wire mesh, 7 is a conductive mortar,
Reference numeral 8 is a conductive terrazzo, and 9 is a metal pin. As the conductive mortar 7, a mortar made conductive with carbon black was used (thickness is 20 mm). Conductive terrazzo 8 is a natural cement stone (average particle size 0.2 ~
0.5 mm) and the tetrapot-shaped zinc oxide whiskers (12% by weight) used in Example 1 were mixed (thickness was 2 mm).

This floor material is white and has a surface leakage resistance of 9 ×.
It was 10 ⁶ Ω and showed a good electrostatic diffusion property.

Example 6 An epoxy terrazzo type floor covering having the structure shown in FIG. 6 was prepared. Basically, the materials and construction methods conventionally used for this type of floor covering have been followed. In FIG. 6, reference numeral 10 is a conductive terrazzo, which is a mixture of an epoxy resin binder with natural crushed stone and the tetrapot-shaped zinc oxide whiskers (15% by weight) used in Example 1 (thickness: 10 mm. And).

This flooring material had a beige color and had a surface leakage resistance of 2 × 10 ⁷ Ω, indicating a good electrostatic diffusion property.

Example 7 A coating type floor covering having the structure shown in FIG. 7 was prepared. Basically, the materials and construction methods conventionally used for this type of floor covering have been followed. In FIG. 7, 11 is a conductive paint for undercoat, and 12 is a conductive paint for topcoat. Conductive paint for undercoat 11
Is a solvent-based acrylic urethane binder mixed with carbon black.
2 is a solvent-type acrylic urethane binder, which is the tetrapot zinc oxide whisker (33% solid content) used in Example 1.
A paint mixed with wt% was used (thickness is 0.3 mm
And).

This floor material is white and has a surface leakage resistance of 3
It was × 10 ⁶ Ω and showed a good electrostatic diffusion property.

[0077]

As described above, according to the conductive floor coating material of the present invention and the conductive floor material using the same, both conductivity and mechanical properties can be achieved, and white or bright color system is formed. It is possible to improve the design, and the colors do not fade or discolor due to light or ultraviolet rays. Therefore, it is possible to obtain a conductive floor coating material and a conductive flooring material which are white or bright-colored and have little discoloration or fading due to light such as ultraviolet rays and which are strong.

[Brief description of drawings]

FIG. 1 is an electron micrograph of a zinc oxide whisker used in the present invention.

FIG. 2 is an explanatory diagram of a conductivity imparting mechanism.

FIG. 3 is a partial cross-sectional view of the first structural example of the flooring material.

FIG. 4 is a partial cross-sectional view of a second structural example of the flooring material.

FIG. 5 is a partial cross-sectional view of a third structural example of the flooring material.

FIG. 6 is a partial cross-sectional view of a fourth structural example of the flooring material.

FIG. 7 is a partial cross-sectional view of a fifth structural example of the flooring material.

[Explanation of symbols]

 1 Steel Plate 3 Conductive Primer 4 Conductive Finishing Material 5 Conductive Resin Mortar 6 Wire Mesh 7 Conductive Mortar 8 Conductive Terrazo 10 Conductive Terrazo 11 Conductive Paint 12 Conductive Paint

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[Procedure amendment]

[Submission date] April 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 is an electron micrograph showing a crystal structure of zinc oxide whiskers.

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display area E04F 15/12 M 7805-2E 15/18 V 7805-2E

Claims (13)

[Claims] 1. A zinc oxide whisker having a length from the base to the tip of 3 to 200 μm per 100 parts by weight of a binder.
The coating material for conductive floors is characterized by containing ˜500 parts by weight. 2. The binder is an organic binder.
The conductive floor coating material described. 3. The binder is an inorganic binder.
The conductive floor coating material described. 4. The conductive floor coating material according to claim 1, wherein the binder comprises an inorganic cement and an organic binder. 5. The conductive floor coating according to claim 1, wherein the zinc oxide whiskers have a tetrapot shape composed of a core and needle-shaped crystal parts extending in different four-axis directions from the core. Material. 6. The binder 10 comprises at least a part of the coating layer.
The length from the base to the tip is 3 to 200 with respect to 0 parts by weight.
A conductive flooring material comprising a conductive flooring coating material containing 1 to 500 parts by weight of a zinc oxide whisker having a thickness of 1 μm. 7. The conductive flooring material according to claim 6, wherein the binder is an organic binder. 8. The conductive flooring material according to claim 6, wherein the binder is an inorganic binder. 9. The conductive flooring material according to claim 6, wherein the binder comprises an inorganic cement and an organic binder. 10. The conductive flooring material according to claim 6, 7, 8 or 9, wherein the coating layer is a terrazzo type. 11. The conductive flooring material according to claim 6, wherein the coating layer is of a resin mortar type. 12. The conductive flooring material according to claim 6, 7, 8 or 9, wherein the coating layer is a flow spread type. 13. The conductive flooring material according to claim 6, 7, 8 or 9, wherein the coating layer is a coating type.