JP2017001348A - Static preventing structure, method for producing the same, and static preventing antifouling structure - Google Patents

Abstract

An antistatic structure having excellent antistatic properties, a production method thereof, and an antistatic antifouling structure are provided. An antistatic structure includes a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, and the surface layer has a conductive layer containing conductive acicular particles. The antistatic antifouling structure comprises a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, and the surface layer has a conductive layer containing conductive acicular particles. And a fluorine-containing liquid impregnated in the surface layer. [Selection] Figure 1

Description

  The present invention relates to an antistatic structure, a method for producing the same, and an antistatic antifouling structure. More particularly, the present invention relates to an antistatic structure having excellent antistatic properties, a method for producing the antistatic structure, and an antistatic antifouling structure to which the antistatic structure is applied.

  Conventionally, articles having an easy-to-slip surface capable of repelling foreign matter have been proposed. This article is an article having a water repellent surface, a substrate having a rough surface, and a lubricating liquid that wets and adheres to the rough surface so as to form a stabilized liquid coating layer. And a lubricating liquid covering the rough surface with a sufficient thickness so as to form the upper surface of the liquid on the upper side. The rough surface and the lubricating liquid have an affinity for each other so that the lubricating liquid is substantially immobilized on the substrate to form a water repellent surface. Further, it is described that the article can repel foreign matters, that the rough surface has a chemical functionalized layer, and that the rough surface has a roughness coefficient larger than 1 (patent document). 1).

Special table 2014-509959 gazette

  However, the article described in Patent Document 1 has a problem that fluorine oil is easily charged, and solid dirt such as dust and sand is likely to adhere due to static electricity.

  The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide an antistatic structure having excellent antistatic properties, an antistatic antifouling structure to which the antistatic structure is applied, an automobile part to which the antistatic antifouling structure is applied, and a method for producing the antistatic structure. To do.

  The inventors of the present invention have made extensive studies in order to achieve the above object. As a result, the above object is achieved by including a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, and the surface layer has a conductive layer containing conductive acicular particles. Has been found to be achieved, and the present invention has been completed.

  That is, the antistatic structure of the present invention includes a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, and the surface layer has a conductive layer containing conductive acicular particles.

  Moreover, the antistatic antifouling structure of the present invention comprises the antistatic structure of the present invention and a fluorine-containing liquid impregnated in the surface layer thereof.

  Furthermore, the method for producing an antistatic structure of the present invention comprises a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, and the surface layer contains conductive acicular particles. A method for producing an antistatic structure having the following steps (1) to (3).

Step (1): A raw material for the constituent material of the surface layer (excluding the surface treating agent) and a dispersion for dispersing the raw material, the specific gravity (G ₁ ) of the conductive needle-like particles, and the raw material The coating layer is formed on the substrate with a coating liquid having a specific gravity difference (G ₁ -G ₂ ) of 2 or more with respect to the specific gravity (G ₂ ) of the solution containing the dispersion liquid other than the conductive needle-like particles. Form.
Step (2): The coating layer, which is implemented after Step (1), is heated to remove the dispersion medium in the coating layer.
Step (3): The coating layer, which is implemented after the step (2), is heated to react the raw materials in the coating layer to form a surface layer.

  According to the present invention, a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure is provided, and the surface layer has a conductive layer containing conductive acicular particles. Therefore, it is possible to provide an antistatic structure having excellent antistatic properties, a method for producing the antistatic structure, and an antistatic antifouling structure to which the antistatic structure is applied.

1A is a schematic cross-sectional view showing an antistatic structure according to the first embodiment of the present invention, and FIG. 1B is an antistatic structure shown in FIG. 1A. It is explanatory drawing which shows arrangement | positioning of the conductive acicular particle in the conductive layer seen from the upper surface side. FIG. 2 is a flowchart showing a method for manufacturing an antistatic structure according to the second embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing an antistatic antifouling structure according to the third embodiment of the present invention.

  Hereinafter, an antistatic structure according to an embodiment of the present invention, a method for manufacturing the antistatic structure, and an antistatic antifouling structure to which the antistatic structure is applied will be described in detail.

(First embodiment)
First, the antistatic structure according to the first embodiment of the present invention will be described in detail with reference to the drawings. In addition, the dimension ratio of drawing quoted by the following embodiment is exaggerated on account of description, and may differ from an actual ratio. FIG. 1A is a schematic cross-sectional view showing an antistatic structure according to the first embodiment of the present invention, and FIG. 1B is an antistatic structure shown in FIG. It is explanatory drawing which shows arrangement | positioning of the conductive acicular particle | grains in the conductive layer seen from the upper surface side of the structure. In FIG. 1B, the description of the constituent material of the surface layer other than the conductive acicular particles contained in the conductive layer is omitted in some cases.

  As shown in FIG. 1, the antistatic structure 10 of the present embodiment includes a surface layer 11 formed on at least one of a fine concavo-convex structure and a fine porous structure on a base material 13. However, it has the conductive layer 12 containing the conductive needle-like particles 12A in a dispersed state. In the present embodiment, the conductive layer 12 is disposed in the lowermost layer of the surface layer 11. In addition, the code | symbol 11A in FIG. 1 (A) shows the structural material (except electroconductive acicular particle | grains) of the surface layer 11. FIG.

  Here, in the present invention, the “fine concavo-convex structure” is composed of, for example, a plurality of fine convex portions, and the concave portions (openings) on the formed surface are in the in-layer direction perpendicular to the layer thickness direction. A structure arranged continuously. In such a structure, the average diameter of the openings cannot be defined.

  Further, in the present invention, the “microporous structure” is composed of, for example, a porous body having a plurality of micropores, and the formed surface recesses (openings) are perpendicular to the layer thickness direction. A structure that is discontinuously arranged in the inward direction. In such a structure, the average diameter of the openings can be defined. Moreover, in such a structure, it is preferable that the micropore formed inside is continuous, but it may be discontinuous.

  As described above, the surface layer formed by at least one of the fine concavo-convex structure and the fine porous structure is provided, and the surface layer is excellent by having a conductive layer containing conductive acicular particles. Thus, an antistatic structure having antistatic properties is obtained.

  When the surface layer is impregnated with a fluorine-containing liquid such as fluorine oil, which will be described in detail later, to form an antistatic antifouling structure, the fluorine-containing liquid is difficult to be charged due to the action of the conductive layer that diffuses the charge. Therefore, it is possible to suppress adhesion of solid dirt such as dust and sand. Of course, the liquid dirt can be easily slid down by impregnating with the fluorine-containing liquid.

  Here, each configuration will be described in more detail.

  Examples of the component 11A include simple oxides such as silicon oxide, aluminum oxide, magnesium oxide, titanium oxide, cerium oxide, niobium oxide, zirconium oxide, indium oxide, tin oxide, zinc oxide, and hafnium oxide, and barium titanate. It is possible to apply a composite oxide such as glass or the like. However, it is not limited to these, and non-oxides such as silicon nitride and fluorine magnesium can also be applied. Among these, silicon oxide, aluminum oxide, titanium oxide, indium oxide, tin oxide, zirconium oxide and the like are preferable from the viewpoint of excellent light transmittance.

  Examples of the conductive acicular particles 12A include tin-doped indium oxide (ITO), fluorine-doped tin oxide (FTO), antimony-doped tin oxide (ATO), aluminum-doped zinc oxide (AZO), and gallium-doped zinc oxide ( Inorganic materials such as GZO) can be applied. However, the present invention is not limited to these, and organic materials such as conductive resin fibers made of polyacetylene, polypyrrole, polythiophene, polyaniline, and the like can also be applied. When an inorganic material is applied, an antistatic structure having excellent durability can be obtained as compared with a case where an organic material is applied.

  Furthermore, as the base material 13, for example, simple oxides such as silicon oxide, aluminum oxide, magnesium oxide, titanium oxide, cerium oxide, niobium oxide, zirconium oxide, indium oxide, hafnium oxide, and composite oxide such as barium titanate. A thing, Furthermore, glass etc. can be applied. However, the present invention is not limited to these, and non-oxides such as silicon nitride and fluorine magnesium can also be applied. Moreover, it is not limited to these inorganic substances, for example, non-crosslinked acrylic, crosslinked acrylic, crosslinked acrylic-urethane copolymer, crosslinked acrylic-elastomer copolymer, silicone elastomer, polyethylene, polypropylene, crosslinked polyvinyl alcohol, poly Vinylidene chloride, polyethylene terephthalate, polyvinyl chloride, polycarbonate, modified polyphenylene ether, polyphenylene sulfide, polyether ether ketone, liquid crystalline polymer, fluororesin, polyarate, polysulfone, polyethersulfone, polyamideimide, polyetherimide, thermoplastic polyimide, Organic substances such as polystyrene and urethane elastomer can also be applied. The base material can be formed separately or integrally with the surface layer, but can be omitted.

  In the present embodiment, as described above, it is preferable that the conductive layer is disposed in the lowermost layer of the surface layer. With such a configuration, an antistatic structure having better antistatic properties can be obtained. In other words, it is possible to obtain an antistatic structure having excellent antistatic properties while suppressing the amount of conductive needle-like particles added. In addition, since the conductive acicular particles contained in the conductive layer are oriented in a certain direction, it is possible to obtain an antistatic structure having light scattering prevention properties and excellent transparency. Further, when the conductive layer is disposed in the lowermost layer of the surface layer, for example, as compared with the case where it is disposed in the uppermost layer of the surface layer, fluorine such as fluorine oil to be described later in detail. There is an advantage that it is easy to ensure the affinity with the contained liquid and it is possible to ensure excellent water droplet sliding properties. However, it is not limited to such a configuration, and it goes without saying that it is included in the scope of the present invention as long as the effects of the present invention can be expressed.

Furthermore, in this embodiment, the conductive layer has the following formula (1):
d [nm] ≦ 380 [nm] / n ₁ (1)
(In formula (1), it is preferable that d represents the thickness of the conductive layer, and n ₁ represents the refractive index of the conductive needle particles).

  Here, as the “thickness (d) of the conductive layer” in the present invention, for example, conductive needle-like particles are observed with a transmission electron microscope (TEM) in a cross section perpendicular to the upper surface of the antistatic structure. The thickness within a range including the conductive needle-like particles to be measured can be applied.

In the present invention, as the “refractive index (n ₁ ) of conductive needle-like particles”, for example, the refractive index of a conductive film having the same composition measured by an Abbe refractometer can be applied.

  Furthermore, in this embodiment, it is preferable that the conductive acicular particles are made of a transparent inorganic compound such as antimony-doped tin oxide (ATO). As a specific example, a needle-shaped transparent conductive material (FS-10P) manufactured by Ishihara Sangyo Co., Ltd. can be mentioned. With such a configuration, it is possible to obtain an antistatic structure having excellent transparency and superior durability as compared with the case where an organic substance is applied.

With the configuration as described above, the thickness of the conductive layer is preferably 100 nm or less, more preferably 10 to 90 nm, and the conductive acicular particles are oriented in a direction perpendicular to the layer thickness direction. Therefore, it is easy to achieve both light transmission and light scattering prevention, and an antistatic structure having more excellent transparency can be obtained. On the other hand, when the thickness of the conductive layer is thick and exceeds 380 / n ₁ [nm], the antistatic structure having excellent transparency due to the reason that the amount of conductive needle-like particles added is limited. It may not be. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

Further, in the present embodiment, the conductive acicular particles are represented by the following formulas (2) and (3).
10 ≦ B [nm] / A [nm] ≦ 100 (2)
A [nm] <380 [nm] / n ₁ (3)
(In the formulas (2) and (3), A represents the short diameter of the conductive needle-shaped particles, B represents the long diameter of the conductive needle-shaped particles, and n ₁ represents the refractive index of the conductive needle-shaped particles). It is preferable to satisfy the relationship.

  Here, in the present invention, the “short diameter (A) of the conductive needle-like particles” means, for example, the conductive needle-like particles from the upper surface of the antistatic structure by scanning electron microscope (SEM) or transmission electron microscope ( The average value of the distance when a plurality of conductive needle-like particles to be observed are sandwiched between two parallel lines and the interval between the two parallel lines is minimized. In the present invention, the “major diameter (B) of the conductive needle-like particles” means the average value of the distance when the particles are sandwiched by two parallel lines in a direction perpendicular to the two parallel lines when the minor axis is defined. Say.

  With the above-described configuration, since the conductive needle-like particles do not cause Mie scattering, an antistatic structure having excellent transparency can be obtained. In addition, since excellent transparency can be ensured, the amount of conductive needle-like particles added can be increased, and an antistatic structure having better antistatic properties can be obtained. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

  Moreover, in this embodiment, it is suitable that a surface layer contains 1-10 mass% of conductive acicular particles, and it is more suitable that 2-9.5 mass% is contained. With such a configuration, it is possible to provide an antistatic structure having a large gap between the conductive needle-like particles, easily ensuring light transmittance, and excellent transparency. Moreover, when the conductive layer is disposed in the lowermost layer of the surface layer, and the surface layer contains 1 to 10% by mass of the conductive acicular particles, the gap between the conductive acicular particles is large, Since the conductive acicular particles contained in the conductive layer are oriented in a certain direction, it is easy to achieve both light transmission and light scattering prevention, and an antistatic structure having better transparency can be obtained. On the other hand, when the content of the conductive acicular particles is small and less than 1% by mass, the antistatic structure having excellent transparency due to the reason that the applied conductive acicular particles are limited and the like. It may not be. On the other hand, when the content of the conductive needle-shaped particles is large and exceeds 10% by mass, the antistatic structure having excellent transparency due to the reason that the applied conductive needle-shaped particles are limited, It may not be. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

Furthermore, in this embodiment, the surface layer is formed of a fine porous structure, and the fine porous structure is represented by the following formula (4).
10 [nm] ≦ D [nm] ≦ 400 [nm] / n ₂ (4)
(In the formula (4), D represents the average diameter of the surface opening of the fine porous structure, and n ₂ represents the refractive index of the constituent material of the surface layer (excluding the conductive needle particles)). It is preferable to satisfy the relationship shown.

  Here, in the present invention, as the “average diameter (D) of the surface opening of the microporous structure”, for example, the surface opening is observed from the upper surface of the antistatic structure by a scanning electron microscope (SEM), By image analysis, each opening can be converted into a circle with the same area, and the average of the diameters of the circles can be applied.

In the present invention, the “refractive index (n ₂ ) of the constituent material of the surface layer” is, for example, a film made of a constituent material (excluding conductive acicular particles) having the same composition measured by an Abbe refractometer. A refractive index can be applied. In addition, when the surface treatment which forms a monomolecular layer is made | formed with respect to the structural material of a surface layer, the structural material (except electroconductive needle-like particle | grains) of the same composition measured with an Abbe refractometer, for example. The refractive index of a film obtained by subjecting the film to surface treatment can be applied.

With the above-described configuration, it is possible to obtain an antistatic structure having excellent retention of fluorine-containing liquid and excellent transparency. That is, the fine porous structure is excellent in retention of the fluorine-containing liquid as compared with the fine concavo-convex structure. And when the average diameter of an opening part is 10 [nm] or more, it can be set as the antistatic structure which has the outstanding holding | maintenance of the fluorine-containing liquid. In addition, when the average diameter of the openings is 400 / n ₂ [nm] or less, an antistatic structure having a particularly small haze value and excellent transparency can be obtained. The haze value is required to be less than 1% in automobile parts, and is preferably 0.1% to 0.8%. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

In the present embodiment, the surface layer is formed of a fine porous structure, and the conductive layer in the surface layer is represented by the following formula (5).
40 [nm] ≦ d [nm] ≦ 380 [nm] / n ₁ (5)
(In the formula (5), d is the thickness of the conductive layer, n ₁ is. Showing the refractive index of the conductive acicular particles) it is preferred to satisfy the relationship shown in.

With the configuration as described above, the conductive needle-like particles of the conductive layer in the surface layer formed by the fine porous structure are oriented in a direction perpendicular to the layer thickness direction, and light transmittance and light scattering prevention Therefore, it is possible to obtain an antistatic structure having more excellent transparency. On the other hand, when the thickness of the conductive layer is large and less than 40 [nm] or exceeds 380 / n ₁ [nm], excellent transparency is achieved because the amount of conductive needle-shaped particles added is limited. In some cases, the antistatic structure may not be formed. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

  Furthermore, in this embodiment, it is preferable that the surface layer is formed of a fine porous structure and contains 5 to 10% by mass of conductive acicular particles. With such a structure, the surface layer formed by the fine porous structure has a large gap between the conductive needle-like particles of the conductive layer, and it is easy to ensure light transmission and has an excellent antistatic structure. It can be a body. Further, when the conductive layer is disposed in the lowermost layer of the surface layer formed of the fine porous structure, and the surface layer contains 5 to 10% by mass of conductive needle-like particles, the conductive layer Since the gap between the acicular particles is large and the conductive acicular particles contained in the conductive layer are oriented in a certain direction, it is easy to achieve both light transmission and light scattering prevention properties, and an antistatic structure with better transparency. It can be a body. On the other hand, when the content of the conductive acicular particles is small and less than 5% by mass, the antistatic structure having excellent transparency due to the reason that the applied conductive acicular particles are limited and the like. It may not be. On the other hand, when the content of the conductive needle-shaped particles is large and exceeds 10% by mass, the antistatic structure having excellent transparency due to the reason that the applied conductive needle-shaped particles are limited, It may not be. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

In the present embodiment, the surface layer is formed of a fine porous structure, and the fine porous structure is represented by the following formula (6).
10 [nm] ≦ D [nm] ≦ 200 [nm] (6)
(In formula (6), it is preferable that D represents the average diameter of the surface openings of the microporous structure.) The upper limit of formula (6) is 150 [nm] or less. Is more preferably 100 [nm] or less, and particularly preferably 50 [nm] or less.

  With the above-described configuration, it is possible to obtain an antistatic structure having excellent retention of fluorine-containing liquid and excellent transparency. That is, the fine porous structure is excellent in retention of the fluorine-containing liquid as compared with the fine concavo-convex structure. And when the average diameter of an opening part is 10 [nm] or more, it can be set as the antistatic structure which has the outstanding holding | maintenance of the fluorine-containing liquid. In addition, when the average diameter of the openings is 200 [nm] or less, more preferably 150 [nm] or less, further preferably 100 [nm] or less, particularly preferably 50 [nm], the haze value is particularly small. Thus, an antistatic structure having excellent transparency can be obtained. The haze value is required to be less than 1% in automobile parts, and is preferably 0.1% to 0.8%. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

(Second Embodiment)
Next, the manufacturing method of the antistatic structure according to the second embodiment of the present invention will be described in detail with reference to the drawings. The antistatic structure of the present invention does not have to be obtained by the method of manufacturing the antistatic structure of the present invention, but the antistatic structure is manufactured by the method of manufacturing the antistatic structure of the present invention. By doing so, it can be easily manufactured. Moreover, about the thing equivalent to what was demonstrated in said embodiment, the code | symbol same as them is attached | subjected and description is abbreviate | omitted. FIG. 2 is a flowchart showing a method for manufacturing an antistatic structure according to the second embodiment of the present invention.

  As shown in FIG. 2, the manufacturing method of the antistatic structure of this embodiment is a method of manufacturing the antistatic structure according to one embodiment of the present invention, and includes the following steps (1) to (4). )including.

First, as shown in FIG. 2A, in step (1), a coating layer 21 is formed on the base material 13 with the coating liquid 20. The coating liquid 20 contains a raw material for the constituent material of the surface layer (excluding the surface treatment agent) and a dispersion for dispersing the raw material, and has a specific gravity (G ₁ ) of the conductive needle-like particles 12A. The specific gravity difference (G ₁ -G ₂ ) of the raw material other than the conductive needle-like particles 12A and the specific gravity (G ₂ ) of the solution containing the dispersion is 2 or more, preferably 3 to 10 It is a thing. At this time, the specific gravity of the conductive needle-like particles is about 4 to 8, and the specific gravity of the solution is about 0.9 to 1.2. The above solution includes a colloidal solution.

  Next, as shown in FIG. 2B, in the step (4) performed after the step 1 (1) and before the step (2), the coat layer 21 is allowed to stand and the coat layer The conductive needle-like particles 12A in 21 are allowed to settle. At this time, for example, the conductive needle-like particles are surely settled by allowing to stand at room temperature for 1 to 10 minutes, preferably 3 to 7 minutes, and the conductive layer is disposed in the lowermost layer of the surface layer. it can.

  Further, as shown in FIG. 2C, in the step (2) performed after the step (1), the coat layer 21 is heated to remove the dispersion medium in the coat layer 21. Thereby, the coating layer 21 containing the raw material 21A (except for the surface treatment agent and conductive needle particles) and the conductive needle particles 12A is formed. At this time, for example, the dispersion medium in the coat layer can be removed by heat treatment at 100 to 200 ° C. for 30 minutes to 2 hours.

  Thereafter, as shown in FIG. 2D, in the step (3) performed after the step (2), the coating layer 21 is heated to cause the raw material in the coating layer 21 to undergo a polymerization reaction, thereby forming a fine concavo-convex structure. A surface layer 11 having a conductive layer 12 formed of at least one of a body and a fine porous structure and containing conductive needle-like particles 12A is formed. In addition, the code | symbol 11A in FIG.2 (D) shows the structural material (except electroconductive needle-shaped particle | grains) of the surface layer 11. FIG. Thereby, the antistatic structure 10 is obtained. At this time, for example, by heating at 400 to 600 ° C. for 30 minutes to 2 hours, the predetermined surface layer can be formed by baking.

  As described above, the antistatic structure is easily produced by the production method to which the sol-gel method including the steps (1) to (3), preferably the steps (1) to (4) is applied. be able to. In other words, through the steps (1) to (3), most of the conductive needle-like particles settle and can be oriented in parallel to the substrate surface by the time of temporary curing to remove the dispersion medium. It becomes possible to make it easy to achieve both light transmission and light scattering prevention. Further, by passing through the step (4), the conductive acicular particles settle more reliably and can be oriented parallel to the substrate surface by the time of temporary curing to remove the dispersion medium, and light transmission It becomes possible to make it the structure which is easy to make compatibility and light scattering prevention compatible.

  Here, the raw material of the constituent material of the surface layer other than the surface treatment agent and the conductive acicular particles will be described in detail.

  Examples of the raw material of the constituent material for the surface layer include those that contain the components of the constituent material for the surface layer described above and can be dispersed in a dispersion described later to prepare a sol solution. When the constituent material is silicon oxide, for example, silicates such as methyl silicate, ethyl silicate, propyl silicate, and butyl silicate can be applied. However, it is not limited to these.

  Examples of the dispersion include a mixture of water and triethylene glycol, methanol, ethanol, propanol, isopropanol, butanol, n-hexane, and the like. However, it is not limited to these. Further, hydrochloric acid or sulfuric acid can be added as a reaction catalyst.

  In addition, it is preferable to adjust the relationship between the surface free energy of the surface of the fine protrusions and the fine pores of the surface layer and the surface free energy of a fluorine-containing liquid such as fluorine oil to be impregnated or retained in detail. As this adjustment method, there are a dry film forming method by physical vapor deposition (PVD) and chemical vapor deposition (CVD), and a wet method in which a reactive reagent such as a fluorine-based silane coupling agent is applied and surface-treated. is there. Among them, a preferable method that can be more easily and uniformly adjusted is a wet method in which a surface treatment agent such as a fluorine-based silane coupling agent diluted in a fluorine-based solvent is applied.

  In the above case, the fluorinated main chain of the silane coupling agent is preferably a perfluoropolyether, perfluoroalkyl, or the like, and the presence of oxygen increases the interaction between the fluorinated main chains. A fluorine-based main chain made of fluoropolyether is more preferable. By applying these, the retention of the fluorine-containing liquid in the surface layer can be improved.

In addition, as a surface treatment material other than the fluorine-based silane coupling agent, for example, CH ₃ — (Si (CH ₃ ) 2 —O) n—Si (CH ₃ ) ₂ OCH ₃ (n>13; contact angle 95 to 95) 105 °), CH ₃ — (Si (CH ₃ ) ₂ —O) _n —SiCH ₃ (OCH ₃ ) ₂ (n>13; contact angle 95 to 105 °), CH ₃ — (Si (CH ₃ ) ₂ — _{O) n-Si (OCH 3} ) 3 (n>13; contact angle _{95~105 °), CH 3 - (} Si (CH 3) 2 -O) n -Si (OC 2 H 5) 3 (n> 13 Contact angle 95-105 °), CH ₃ — (Si (CH ₃ ) ₂ —O) _n —Si (CH ₂ ) ₂ (CH ₂ ) ₃ OCH ₂ CH (OH) CH ₂ NH (CH ₂ ) ₃ Si (OCH ₃ ) ₃ (n>13; contact angle 95-105 °), (CH _3- (Si _{(CH 3) 2 -O) n} -Si (CH 3) 2 (CH 2) 3 OCH 2 CH (OH) CH 2) 2 N (CH 2) 3 Si (OCH 3) 3 (n>13; contact angle 95 to 105 °), CH ₃ — (Si (CH ₃ ) ₂ —O) _n —Si (OH) ₃ (n>13; contact angle 95 to 105 °), CH ₃ — (Si (CH ₃ ) ₂ — _{O) n Si (CH 3)} 2 Cl (n>13; contact angle _{95~105 °), CH 3 - (} Si (CH3) 2 -O) n-Si (CH 3) 2 (CH 2) 2 SiCH 3 Cl ₂ (n>13; contact angle 95 to 105 °), CH ₃ — (Si (CH ₃ ) ₂ —O) _n —SiCl ₃ (n>13; contact angle 95 to 105 °), CH ₃ — (Si _{(CH 3) 2 -O) n} -Si (OCOCH 3) 3 (n>13; contact angle 95 to 105 ° _{, CH 3 - (Si (CH} 3) 2 -O) n -Si (NCO) 3 (n>13; contact angle _{95~105 °), CH 3 - (} Si (CH 3) 2 -O) n -Si (CH ₃ ) ₂ (CH ₂ ) ₃ O (CH ₂ ) ₃ OCONHSi (NCO) ₃ (n>13; contact angle 95-105 °), Rf— (CH ₂ ) ₂ — (Si (CH ₃ ) ₂ — _{O) n -Si (CH 3)} 2 (CH 2) 3 OCH 2 CH (OH) CH 2 NHSi (OCH 3) 3 (n>13; contact angle _{95~115 °), (Rf- (CH} 2) 2 _{- (Si (CH 3) 2} -O) n-Si (CH 3) 2 (CH 2) 3 OCH 2 CH (OH) CH 2) 2 n (CH 2) 3 Si (OCH 3) 3 (n> 13 A contact angle of 95 to 115 °). Moreover, what changed the substituent of the said silane compound into isocyanate can also be used.

(Third embodiment)
Next, an antistatic antifouling structure according to a third embodiment of the present invention will be described in detail with reference to the drawings. In addition, about the thing equivalent to what was demonstrated in said embodiment, the code | symbol same as them is attached | subjected and description is abbreviate | omitted. FIG. 3 is a schematic cross-sectional view showing an antistatic antifouling structure according to the third embodiment of the present invention.

  As shown in FIG. 3, the antistatic antifouling structure 1 of the present embodiment includes a surface layer 11 formed on at least one of a fine concavo-convex structure and a fine porous structure on a base material 13, The surface 11 is impregnated with the antistatic structure 10 having the conductive layer 12 containing the conductive needle-like particles 12A in a dispersed state, and the surface layer 11 is retained on the surface layer 11, and the surface layer 11 and a fluorine-containing liquid 30 covering the surface of 11.

  As described above, an antistatic structure comprising a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, the surface layer having a conductive layer containing conductive acicular particles, and a surface And the fluorine-containing liquid impregnated in the layer makes it difficult for the fluorine-containing liquid to be charged by the action of the conductive layer for diffusing the charge, thereby suppressing the adhesion of solid dirt such as dust and sand. It becomes the antistatic antifouling structure which can do. Of course, it is also possible to easily slide down liquid dirt.

  Moreover, in this embodiment, it is preferable to apply the suitable form in 1st Embodiment mentioned above, By this, transparency, durability, and a water drop sliding property can be made excellent as mentioned above. . In addition, the retention of the fluorine-containing liquid can be improved.

  Here, the fluorine-containing liquid will be described in detail.

  The fluorine-containing liquid is not particularly limited as long as it has a fluorine-based main chain or side chain, and specific examples include fluoroether-based and fluoroalkyl-based fluorine oils. Krytox (perfluoropolyether type) manufactured by Dupont has a low vapor pressure (0.01 Pa or less) and low volatility, so it is easy to hold.

  Others include 3M Fluorinert (perfluoroalkyl), Novec (perfluoropolyether) and Daikin Industries' demnum (perfluoroalkyl), but they are short-term because of their high volatility. It is preferable to apply to various uses. In order to adjust the viscosity and vapor pressure of these fluorine oils, a functional group having a halogen element other than fluorine or a halogen other than fluorine may be added to the side chain.

  Moreover, in this embodiment, it is suitable that the evaporation loss after hold | maintaining at 120 degreeC for 24 hours of a fluorine-containing liquid is less than 35 mass%. By adopting such a configuration, an antistatic antifouling structure having excellent durability can be obtained. For example, even when applied to automobile applications, the fluorine-containing liquid spontaneously evaporates and the performance is hardly deteriorated, and the antifouling property can be exhibited for a long period of time near normal temperature (5-35 ° C.). However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

Further, in the present embodiment, a viscosity at 0 ℃ fluorine-containing liquid is preferably not more than 160 mm ² / s, is more suitably a 3~100mm ² / s, 8~80mm ² More preferably, it is / s. By setting it as such a structure, it can be set as the antistatic antifouling | stain-proof structure which has the outstanding water drop sliding property. Thereby, the slidability of dirt can be maintained. However, it is not limited to such a range at all, and it goes without saying that it may be outside this range as long as the effects of the present invention can be expressed.

(Fourth embodiment)
Next, the automotive component according to the fourth embodiment of the present invention will be described in detail.
The automobile part of this embodiment has the antistatic structure or antistatic antifouling structure of the present invention.

  Here, examples of automobile parts include camera lenses, mirrors, glass windows, painted surfaces such as bodies, covers for various lights, door knobs, meter panels, window panels, radiator fins, evaporators, and the like. However, it is not limited to these.

  By adopting the configuration as described above, the antistatic property of the automobile parts can be made excellent, so that the number of times of washing and cleaning the automobile can be reduced. Further, by applying the preferred embodiment in the first or second embodiment described above, the transparency, durability, and water drop sliding properties can be improved as described above. In addition, the retention of the fluorine-containing liquid can be improved. Thereby, for example, if it is applied to a vehicle-mounted camera, a mirror, a window, etc., a clear field of view can be secured even in rainy weather or on a rough road.

  Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1
First, water 0.93 g, triethylene glycol 1.5g, and isopropanol 0.78g uniformly mixed, with the addition of 32N sulfuric acid 0.3g To the resulting mixture, a solution _{A 1} was prepared. Further, ethyl silicate (Colcoat Co., Ltd., Ethyl Silicate 40) 8.04 g and, by uniformly mixing the isopropanol 0.78 g, the solution _{B 1} was prepared.

Next, the obtained solution A ₁ and solution B ₁ were mixed and stirred with a stirrer for 15 minutes to prepare a sol solution.

Further, the obtained sol solution was diluted 5-fold with isopropanol to prepare a solution C ₁ (specific gravity G ₂ : 0.83).

Further, the conductive needle-like particles (composition: antimony-doped tin oxide) were prepared so that the content of the conductive needle-like particles in the surface layer after the ethyl silicate polymerized in the solution C ₁ was 9.5% by mass. , Major axis B / minor axis A: 200 nm / 10 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6.6) were added to prepare a coating solution used in this example.

  Furthermore, a coat layer was formed on a glass substrate by spin coating (rotation speed: 1500 rpm, rotation time: 20 seconds, humidity 60%) using the obtained coating solution.

  Further, the formed coating layer was allowed to stand for 5 minutes at a humidity of 60% and at room temperature (25 ° C.).

  Furthermore, the coating layer which was left still was heated by an oven (heating temperature: 150 ° C., heating time: 1 hour), the dispersion medium was removed, and the coating layer was temporarily cured.

  Thereafter, the pre-cured coat layer was baked at 500 ° C. for 1 hour to obtain the antistatic structure of this example.

(Example 2)
In the solution C ₁ obtained in Example 1, conductive acicular particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 500 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6. 6) was added so that the content of the conductive needle-like particles in the surface layer after the ethyl silicate had undergone the polymerization reaction was 8% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 3)
In the solution C ₁ obtained in Example 1, conductive acicular particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 200 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6. 6) was added so that the content of the conductive needle-like particles in the surface layer after the ethyl silicate had undergone the polymerization reaction was 5% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

Example 4
In the solution C ₁ obtained in Example 1, conductive acicular particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 200 nm / 10 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6. 6) was added so that the content of conductive needle-like particles in the surface layer after the ethyl silicate had undergone a polymerization reaction was 9% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 5)
First, water 0.8 g, and triethylene glycol 1.5g, and evenly mixing the isopropanol 0.78 g, was added 32N sulfuric acid 0.3 g, the solution _{A 5} were prepared. Further, tetraethoxysilane 8.0 g, and isopropanol 0.78g were uniformly mixed, the solution _{B 5} was prepared.

Then, mixed solution A ₅ and solution B ₅ obtained was stirred for 15 minutes with a stirrer to prepare a sol solution.

Further, the obtained sol solution was diluted 5-fold with isopropanol to prepare a solution C ₅ (specific gravity G ₂ : 0.81).

Furthermore, conductive needle-like particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 600 nm / 10 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6.6) are obtained in the obtained solution C _5. Was added so that the content of conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane was 5% by mass to prepare a coating solution used in this example.

  Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 6)
Example 5 In the resulting solution _{C 5} to conductive acicular particles (composition: antimony-doped tin oxide, major axis B / minor A: 200 nm / 10 nm, the refractive index _n 1: 2.1, a specific gravity _G 1: 6. 6) was added so that the content of conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane was 6% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 7)
First, water 0.4 g, and triethylene glycol 1.5g, and evenly mixing the isopropanol 0.78 g, was added 32N sulfuric acid 0.3 g, the solution _{A 7} was prepared. Further, tetraethoxysilane 8.0 g, and isopropanol 0.78g were uniformly mixed, the solution _{B 7} was prepared.

Next, the obtained solution A ₇ and solution B ₇ were mixed and stirred with a stirrer for 15 minutes to prepare a sol solution.

Further, the obtained sol solution was diluted 5-fold with isopropanol to prepare a solution C ₇ (specific gravity G ₂ : 0.81).

Further, conductive needle-like particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 2000 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6.6) were added to the obtained solution C _7. Was added so that the content of the conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane was 2% by mass to prepare a coating solution used in this example.

  Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 8)
In the solution C ₇ obtained in Example 7, conductive acicular particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 2000 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6. 6) was added so that the content of the conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane was 3% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

Example 9
In the solution C ₇ obtained in Example 7, conductive needle-like particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 200 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6. 6) was added so that the content of the conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane was 3% by mass to prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 10)
First, tetraethoxysilane 3.75 g, was mixed with hydrochloric acid (pH 2) 1.15 g, a solution _{A 10} was prepared. Further, a methyltriethoxysilane 9.62 g, was mixed with hydrochloric acid (pH 2) 2.06 g, a solution _{B 10} was prepared.

Next, the obtained solution A ₁₀ and solution B ₁₀ were each stirred for 1 hour, mixed, and stirred for 15 minutes with a slurler to prepare a sol solution.

Furthermore, the obtained sol solution was diluted 10-fold with isopropanol to prepare a solution C ₁₀ (specific gravity G ₂ : 0.80).

Furthermore, conductive needle-like particles (composition: antimony-doped tin oxide, major axis B / minor axis A: 200 nm / 20 nm, refractive index n ₁ : 2.1, specific gravity G ₁ : 6.6) were added to the obtained solution C _10. Was added so that the content of conductive needle-like particles in the surface layer after the polymerization reaction of each silane was 5% by mass to prepare a coating solution used in this example.

  Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Example 11)
Conductive needle-like particles (composition: conductive resin fiber (to which SCIMA manufactured by Toray Industries, Inc. was pulverized and adjusted so as to have a major axis B / minor axis A: 200000 nm / 5000 nm) were added to the solution C ₇ obtained in Example 7 And the content of the conductive needle-like particles in the surface layer after the polymerization reaction of tetraethoxysilane with a refractive index n ₁ : 1.6 and specific gravity G ₁ : 1.1) is 90% by mass. To prepare a coating solution used in this example. Thereafter, the same operation as in Example 1 was repeated except that the obtained coating solution was used to obtain an antistatic structure of this example.

(Comparative Example 1)
The solution C ₁ obtained in Example 1 to prepare a coating solution used in this example. An antistatic structure of this example was obtained by repeating the same operation as in Example 1 except that the obtained coating solution was used. A part of the specification of each example is shown in Table 1. The “surface roughness” in Table 1 was measured with an atomic force microscope. Further, the “evaporation loss” was calculated by measuring it by spreading it on a petri dish and heating it at 120 ° C. for 24 hours.

<Surface treatment>
Moreover, with respect to the antistatic structure of each example, each surface layer was immersed in the surface treating agent shown in Table 1 for 24 hours, and dried at 150 ° C. for 1 hour. Further, this operation was repeated three times to obtain surface-treated antistatic structures of each example.

<Impregnation with fluorine-containing liquid>
Applying the fluorine-containing liquid shown in Table 1 to each surface layer on the surface-treated antistatic structure of each example above, wiping off excess oil on the surface, and antistatic antifouling structure of each example Obtained.

[Performance evaluation]
The following performance was evaluated using the antistatic antifouling structures of the above examples.

(Antistatic property)
About the antistatic antifouling | stain-proof structure of each said example, the surface resistivity was measured using the resistivity meter (the Mitsubishi Chemical Analytech Co., Ltd. make, High Lester UX MCP-HT800), and antistatic property was evaluated. The obtained results are shown in Table 2. In Table 2, “◎” in antistatic property indicates that the surface resistivity is 10 ¹⁰ Ω / □ or less, and “◯” indicates that the surface resistivity exceeds 10 ¹⁰ Ω and is 10 ¹² Ω / □ or less. “×” indicates that the surface resistivity exceeds 10 ¹² Ω / □.

(transparency)
About the antistatic antifouling | stain-proof structure of said each example, haze was measured using the haze meter (made by Murakami Color Research Laboratory Co., Ltd.), and transparency was evaluated. The obtained results are shown in Table 2. In Table 2, “◎” in transparency indicates that haze H is 0.5% or less, “◯” indicates that haze H is greater than 0.5% and 1% or less, and “△”. Indicates that haze H is greater than 1% and 30% or less, and “x” indicates that haze H is greater than 30%.

(durability)
The antistatic antifouling structures of the above examples were slid 1000 reciprocally with a canvas cloth, and the tumbling angle was measured by the same operation as the evaluation of water slidability to evaluate the durability. The obtained results are shown in Table 2. In Table 2, “◎” in durability indicates that the falling angle is 10 ° or less, “◯” indicates that the falling angle is greater than 10 ° and 20 ° or less, and “△” indicates that the falling angle is It indicates that the angle is greater than 20 ° and equal to or less than 40 °, and “X” indicates that the sliding angle is larger than 40 °.

(Water drop slidability)
About the antistatic antifouling structure of each of the above examples, 20 μL of water was dropped, the falling angle was measured, and the water drop sliding property was evaluated. The obtained results are shown in Table 2. In Table 2, “◎” in water drop sliding property indicates that the falling angle is 10 ° or less, “◯” indicates that the falling angle is greater than 10 ° and 15 ° or less, and “△” indicates the falling angle. Is greater than 15 ° and 30 ° or less, and “x” indicates that the sliding angle is greater than 30 °.

  From Table 1 and Table 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 11 belonging to the scope of the present invention is the charging using the antistatic structure of Comparative Example 1 outside the present invention. It can be seen that the antistatic property is superior to the antifouling structure.

  Moreover, it can be seen from Tables 1 and 2 that the antistatic antifouling structures using the antistatic structures of Examples 1 to 11 belonging to the scope of the present invention have excellent water droplet sliding properties.

  Furthermore, from Table 1, Table 2, FIG. 1 and FIG. 3, the antistatic antifouling structure using the antistatic structures of Examples 1 to 11 belonging to the scope of the present invention is the lowest layer of the surface layer of the conductive layer. Therefore, it is considered that they have excellent antistatic properties, water drop sliding properties, transparency, and durability.

  Further, from Tables 1 and 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 10 belonging to the scope of the present invention is excellent because the conductive acicular particles are made of a transparent inorganic compound. It is also considered that they have antistatic properties, water drop sliding properties, transparency, and durability.

  Furthermore, from Table 1 and Table 2, since the antistatic antifouling structure using the antistatic structures of Examples 1 to 11 belonging to the scope of the present invention satisfies the relationship of the above formula (1), it is excellent. It is also considered that they have antistatic properties, water drop sliding properties, transparency, and durability.

  Further, from Tables 1 and 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 10 belonging to the scope of the present invention has the relationship of the above-described formulas (2) and (3). In order to satisfy, it is thought that it has the outstanding antistatic property, water drop sliding property, transparency, and durability.

  Furthermore, from Table 1 and Table 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 10 belonging to the scope of the present invention has a surface layer of 1 to 10% by mass of conductive acicular particles. Since it contains, it is thought that it has the outstanding antistatic property, water-drop sliding property, transparency, and durability.

  Further, from Table 1 and Table 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 10 belonging to the scope of the present invention has a surface layer formed from a fine porous structure, as described above. In order to satisfy the relationship of Formula (4), it is thought that it has the outstanding antistatic property, water drop sliding property, transparency, and durability.

  Further, from Tables 1 and 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 6 belonging to the scope of the present invention has a surface layer formed from a fine porous structure, as described above. In order to satisfy the relationship of Formula (4) and Formula (5), it is thought that it has the outstanding antistatic property, water drop sliding property, transparency, and durability.

  Furthermore, from Table 1 and Table 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 6 belonging to the scope of the present invention has a surface layer formed from a fine porous structure, and is described above. Satisfying the relationship of formula (4) and formula (5), and the surface layer contains 5 to 10% by mass of conductive needle-like particles, and therefore has excellent antistatic properties, water droplet sliding properties, transparency and durability. It is thought to be a thing.

  Further, from Tables 1 and 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 6 belonging to the scope of the present invention has a surface layer formed from a fine porous structure, as described above. Satisfying the relationship of the formulas (4) to (6), and the surface layer contains 5 to 10% by mass of conductive needle-like particles, and therefore has excellent antistatic properties, water droplet sliding properties, transparency and durability. It is thought to be a thing.

Further, from Tables 1 and 2, the antistatic antifouling structure using the antistatic structures of Examples 1 to 10 belonging to the scope of the present invention is obtained from the method for producing an antistatic structure belonging to the scope of the present invention. Specifically, since the surface layer was formed by a sol-gel method using a coating liquid having a specific gravity difference (G ₁ -G ₂ ) of 2 or more, excellent antistatic property, water droplet sliding property, transparency, durability It is possible to easily produce an antistatic antifouling structure having a property.

  As mentioned above, although this invention was demonstrated with some embodiment and an Example, this invention is not limited to these, A various deformation | transformation is possible within the range of the summary of this invention.

  For example, in the above-described embodiment, an automobile part is illustrated as an application of an antistatic structure or an antistatic antifouling structure, but the invention is not limited to this. For example, a motorcycle part, a mobile phone, an electronic device, etc. It can also be applied to mobile devices such as notebooks, signboards, and watches.

1 Antistatic antifouling structure 10 Antistatic structure 11 Surface layer 11A Constituent material (excluding conductive acicular particles)
12 Conductive layer 12A Conductive acicular particles 13 Base material 20 Coating liquid 21 Coat layer 21A Constituent materials (excluding surface treatment agent and conductive acicular particles)
30 Fluorine-containing liquid

Claims (13)

Comprising a surface layer formed by at least one of a fine relief structure and a fine porous structure;
The antistatic structure, wherein the surface layer has a conductive layer containing conductive acicular particles.   The antistatic structure according to claim 1, wherein the conductive layer is disposed in a lowermost layer of the surface layer. The conductive layer has the following formula (1)
d [nm] ≦ 380 [nm] / n ₁ (1)
3. The relationship according to claim 1, wherein d satisfies the relationship shown in formula (1): d is the thickness of the conductive layer, and n ₁ is the refractive index of the conductive needle-like particles. Antistatic structure.   The antistatic structure according to any one of claims 1 to 3, wherein the conductive acicular particles are made of a transparent inorganic compound. The conductive acicular particles are represented by the following formulas (2) and (3).
10 ≦ B [nm] / A [nm] ≦ 100 (2)
A [nm] <380 [nm] / n ₁ (3)
(In Formula (2) and Formula (3), A represents the short diameter of the conductive needle-shaped particles, B represents the long diameter of the conductive needle-shaped particles, and n ₁ represents the refractive index of the conductive needle-shaped particles. The antistatic structure according to any one of claims 1 to 4, wherein the relationship shown in (1) is satisfied.   The antistatic structure according to any one of claims 1 to 5, wherein the surface layer contains 1 to 10% by mass of the conductive acicular particles. The surface layer is formed of the fine porous structure;
The fine porous structure has the following formula (4):
10 [nm] ≦ D [nm] ≦ 400 [nm] / n ₂ (4)
(In the formula (4), D is the refractive index of the average diameter of the surface openings of the fine porous structure, n ₂ is constituting material of the surface layer (except the conductive acicular particles.) The antistatic structure according to claim 5 or 6, wherein the relationship shown in FIG. The conductive layer has the following formula (5)
40 [nm] ≦ d [nm] ≦ 380 [nm] / n ₁ (5)
The antistatic material according to claim 7, wherein the relationship shown in (5) is satisfied, wherein d represents the thickness of the conductive layer, and n ₁ represents the refractive index of the conductive needle particles. Structure.   The antistatic structure according to claim 7 or 8, wherein the surface layer contains 5 to 10 mass% of the conductive acicular particles. The fine porous structure has the following formula (6):
10 [nm] ≦ D [nm] ≦ 200 [nm] (6)
10. In Formula (6), D satisfies the relationship shown to the average diameter of the surface opening part of the said microporous structure. The term as described in any one of Claims 7-9 characterized by the above-mentioned. Antistatic structure. An antistatic structure according to any one of claims 1 to 10,
An antistatic antifouling structure comprising a fluorine-containing liquid impregnated in the surface layer. A method for producing an antistatic structure comprising a surface layer formed of at least one of a fine concavo-convex structure and a fine porous structure, the surface layer having a conductive layer containing conductive acicular particles. The following steps (1) to (3)
(1): containing the raw material of the constituent material of the surface layer (excluding the surface treating agent) and a dispersion for dispersing the raw material, and the specific gravity (G ₁ ) of the conductive needle-like particles The base material is coated with a coating liquid in which the specific gravity difference (G ₁ -G ₂ ) of the raw material other than the conductive acicular particles and the specific gravity (G ₂ ) of the solution containing the dispersion is 2 or more. Forming a coat layer on the surface;
(2): a step of heating the coat layer performed after the step (1) to remove the dispersion medium in the coat layer;
(3): charging comprising: heating the coating layer after the step (2) and reacting the raw materials in the coating layer to form the surface layer. Method for manufacturing prevention structure. (4): A step of allowing the coating needle layer to settle and allowing the conductive needle-like particles in the coating layer to settle after the step (1) and before the step (2). The manufacturing method of the antistatic structure of Claim 12 characterized by the above-mentioned.

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