JPWO2016125409A1 - Coating material, manufacturing method thereof, and surface structure - Google Patents

Abstract

The coating material 100 includes an inorganic porous layer 20 formed by applying a coating liquid in which inorganic fine particles 2 are dispersed on a substrate 1 to be coated. Since the inorganic porous layer 20 is configured by stacking a plurality of inorganic fine particles 2 randomly, a gap between the inorganic fine particles 2 is a hole inside the inorganic porous layer 20. Further, the surface of the inorganic fine particles 2 is provided with an oil repellent film 3 so as to have oil repellency. In addition, the oil repellent fluid 4 is included in the pores of the inorganic porous layer 20.

Description

  The present invention relates to a coating material, a manufacturing method thereof, and a surface structure, and more particularly to a coating material used for various devices, furniture, or building members, a manufacturing method thereof, and a surface structure using the same.

  In cooking equipment such as range hoods, machine tools such as cutting machines, sewage treatment equipment, air conditioning equipment, and various transportation / moving equipment, if oil or oily smoke adheres, the aesthetics and hygiene decline, and Degradation of the original function can occur. Therefore, it is necessary to remove the attached oil. Conventionally, various efforts have been made to facilitate oil removal.

  Many methods for suppressing the adhesion of oil by coating a material with low surface energy typified by fluororesin or silicone have been put into practical use. As an example, Patent Document 1 discloses that an oil-repellent and water-repellent coating agent made of a polymer such as a fluorine-containing monomer having a perfluoroalkyl group is used, so that oil stains hardly occur and the attached oil is removed. A technique for imparting oil repellency, water repellency, and antifouling functions is disclosed.

Japanese Patent Laid-Open No. 10-9630

  In the conventional method which makes it easy to remove oil stains as in Patent Document 1, it is possible to suppress the adhering oil from permeating or sticking, and an effect of facilitating wiping and cleaning can be obtained. However, oil adhesion itself cannot be suppressed. Therefore, some work such as wiping or cleaning for removing the oil is necessary. In addition, conventional techniques using fluororesin or silicone often require heat treatment at a high temperature for coating or use a coating liquid containing a solvent. For this reason, the base material which can be processed was restricted to a metal etc., and there existed a problem that the process to a general purpose plastic surface was difficult. In addition, the coating with which oil is difficult to conform has a problem that its surface is soft and easily deteriorates due to wear.

  The present invention has been made to solve such problems, and the attached oil can be removed without any special work or by a very simple method, a coating material, a method for producing the same, and It aims at obtaining the surface structure using it.

  The present invention is a coating material comprising an inorganic porous layer having an oil repellent surface and a plurality of pores formed therein, and an oil repellent fluid contained in the pores of the inorganic porous layer. is there.

  The coating material of the present invention comprises an inorganic porous layer having an oil-repellent surface and a plurality of pores formed therein, and an oil-repellent fluid contained in the pores of the inorganic porous layer. Therefore, the attached oil can be removed without performing any special work or by a very simple method.

It is a schematic diagram which shows the coating material which is excellent in the removal property of adhesion oil based on Embodiment 1 of this invention. It is a schematic diagram which shows lubrication of the adhesion oil in the coating material which is excellent in the removability of adhesion oil based on Embodiment 1 of this invention. In the comparative example with respect to Embodiment 4 of this invention, when adhesion oil flows away from the coating material excellent in the removal property of adhesion oil, it is a schematic diagram which shows the phenomenon in which an oil-repellent fluid flows out with adhesion oil. Schematic showing that when an oleophilic or oil-absorbing member is installed in the vicinity of a coating material that is excellent in the ability to remove adhering oil according to Embodiment 4 of the present invention, the oil-repellent fluid does not flow out with the outflow of adhering oil. FIG. It is explanatory drawing which shows the manufacturing method of the coating material based on Embodiment 1 of this invention. It is sectional drawing of the motor which gave the coating material based on Embodiment 2 of this invention. It is sectional drawing of the motor which gave the coating material based on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a coating material 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, a coating material 100 according to Embodiment 1 of the present invention includes an inorganic porous layer 20 formed from a plurality of inorganic fine particles 2 provided on a substrate 1, and the surface of each inorganic fine particle 2. And an oil-repellent fluid 4 inserted between the inorganic fine particles 2 to which the oil-repellent film 3 is applied. The inorganic porous layer 20 is configured by randomly laminating a plurality of inorganic fine particles 2 in a needle shape, a plate shape, or an elliptic sphere shape. Therefore, a gap is formed between those inorganic fine particles 2. The gaps serve as pores inside the inorganic porous layer 20 and form a plurality of recesses on the surface (upper surface) of the inorganic porous layer 20. The oil repellent fluid 4 is contained in the pores of the inorganic porous layer 20 and in the recesses on the surface. Note that the shape and size of the inorganic fine particles 2 do not have to be the same, and may vary. In the following description, the coating material 100 and the substrate 1 to be coated are collectively referred to as “surface structure”. The substrate 1 is, for example, cooking equipment such as a range hood, machine tools such as a cutting machine, sewage treatment equipment, air conditioning equipment, and various equipment such as various transportation / moving equipment, furniture, or It means a member constituting the surface of a coating object such as a building member.

  FIG. 5 shows a coating material 100 shown in FIG. 1 and a method for manufacturing a surface structure using the same. As shown in FIG. 5, the coating material 100 shown in FIG. 1 and the surface structure manufacturing method using the same include the following steps S <b> 1 to S <b> 3.

Step S1: Step of forming an inorganic porous layer by applying an inorganic fine particle dispersion Step S2: Step of oil repellency treatment of the surface of the inorganic porous layer with a fluorine compound Step S3: Impregnation of the oil-repellent fluid into the inorganic porous layer Process of

  In the “step of forming an inorganic porous layer by applying an inorganic fine particle dispersion” in step S1, a dispersion having fluidity is generated by dispersing the inorganic fine particles 2 in a dispersion medium such as water. The dispersion is sprayed on the surface of the substrate 1 by spraying or the like to form a liquid film. Thus, the inorganic porous layer 20 is formed by evaporating the dispersion medium during or after the formation of the liquid film.

  In “the step of oil repellency treatment of the surface of the inorganic porous layer with the fluorine-based compound” in step S2, each of the inorganic fine particles is formed by applying the oil repellent film 3 to the entire surface of each inorganic fine particle 2 constituting the inorganic porous layer 20. 2. Make oil repellent. Specifically, the oil repellent film 3 is formed by allowing a chemical agent, which is a material for the oil repellent film 3, to enter into the pores of the inorganic porous layer 20 to react or adhere. Thus, since the surface of each inorganic fine particle 2 is covered with the oil-repellent film 3, the surface of the inorganic porous layer 20 has oil repellency. Therefore, even if the inorganic fine particles 2 are exposed from the oil-repellent fluid 4, there is an advantage that there is no effect of promoting oil adhesion. In organic porous materials, a flat surface is formed due to wear and the like, and oil adheres easily. However, such a phenomenon can be avoided by using inorganic porous materials.

  In the “step of impregnating the inorganic porous layer with the oil-repellent fluid” in step S 3, the oil-repellent fluid 4 is filled in the pores of the inorganic porous layer 20 and the recesses on the surface. Specifically, by bringing the oil-repellent fluid 4 into contact with the inorganic porous layer 20, the pores of the inorganic porous layer 20 and the concave portions on the surface can be filled by capillary action.

  Next, the effect of the coating material 100 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. However, these schematic diagrams show the concept of the present invention, but the present invention is not limited to this embodiment.

  As described above, the coating material 100 according to Embodiment 1 of the present invention includes the inorganic porous layer 20 having oil repellency on the surface, and the oil repellency fluid 4 contained in the hole portion formed in the inside. Is. As shown in FIG. 1, an inorganic porous layer 20 made of inorganic fine particles 2 is formed on the substrate 1. Since the surface of each inorganic fine particle 2 is covered with the oil-repellent film 3, the entire surface of the inorganic porous layer 20 is oil-repellent. Further, the oil-repellent fluid 4 is present in the pores of the inorganic porous layer 20 and in the concave portions on the surface, and exhibits further oil-repellency. Here, the oil-repellent fluid 4 is a fluid that is incompatible with water or oil such as alkyl fluoride and does not solidify at room temperature.

  In the present embodiment, as described above with reference to FIG. 5, the inorganic porous layer 20 is formed by applying the dispersion of the inorganic fine particles 2, and the inorganic porous layer 20 is bonded directly to the inorganic fine particles 2. It is formed with. For this reason, compared with the case where it forms with the porous body of organic substance, for example, a fluororesin, and fluorinated silicone, high film | membrane intensity | strength is obtained. Even after the inorganic porous layer 20 has been made oil-repellent and filled with the oil-repellent fluid 4 to form a surface structure with excellent removability of the adhered oil 5, an organic porous material is used depending on the strength of the inorganic porous layer 20. Compared to the case, high strength can be obtained. Therefore, the strength of the inorganic porous layer 20 according to the first embodiment is that the substrate 1 is made of polyolefin such as polyethylene or polypropylene, acrylic resin or methacrylic resin, urethane resin, polyester, ABS, PS, polyvinyl chloride, PET, or the like. Even when a general-purpose thermoplastic plastic is used, a favorable effect of improving the strength can be obtained. In general, when an oil-repellent organic film is formed on such a general-purpose plastic, the adhesion is weak, and the film is flexible and easily deformed, so that it is easy to peel off when a force such as friction is applied. . On the other hand, in the first embodiment, since the hard inorganic porous layer 20 is used, a certain amount of bonding force (bonding force equal to or higher than a preset threshold value) exists between the plastic surface and the inorganic porous layer 20. If present, it is difficult to peel off due to friction or the like. As a technique for improving the adhesion of the inorganic fine particles 2, there is also an advantage that a technique for obtaining a bonding force by hydrophilizing the plastic surface constituting the substrate 1 by corona discharge or ultraviolet treatment can be used. When plastics called super engineering plastics such as engineering plastics such as polyamide, polycarbonate and polyacetal, polysulfone and polyimide are used for the substrate 1 in the first embodiment, the strength of the plastic surface is higher than in the case of the general-purpose plastics. The inorganic porous layer is less likely to be peeled off at the time of friction or the like, and a more preferable result is obtained.

  The surface of the inorganic porous layer 20 needs to be oil repellent. In the first embodiment, the formation of the oil-repellent film 3 by the coating of the oil-repellent resin is illustrated. However, the use of oil-repellent inorganic fine particles or the use of various oil-repellent agents is also effective. Various methods can be used as long as the porous holes are not filled by oil repellency. Among these oil repellency methods, the method using an oil repellent resin coating is difficult to expose the non-oil repellent surface of the inorganic fine particles 2 due to friction or the like, and also has an effect of suppressing the detachment of the inorganic fine particles 2. This is particularly preferable.

  Thus, in Embodiment 1, since the surface of the inorganic porous layer 20 is made oil-repellent by applying the oil-repellent film 3, the oil-repellent fluid 4 is put in the pores of the inorganic porous layer 20. Can exist stably. When a sufficient amount of the oil-repellent fluid 4 is filled, the oil-repellent fluid 4 is exposed on the outermost surface of the inorganic porous layer 20. When excess oil-repellent fluid 4 is present, a liquid film covering the inorganic porous layer 20 is formed. Even in this case, the effect of increasing the lubricity of the adhered oil of the present invention can be obtained. However, in this case, there are phenomena that the oil-repellent fluid 4 flows away, adheres to other objects and is easily lost, or dust or the like easily adheres to the oil-repellent fluid 4. Due to the presence of the oil-repellent fluid 4 that adequately fills the pores of the inorganic porous layer 20 and the recesses on the surface, the oil-repellent fluid 4 is lost from the surface structure of the inorganic porous layer 20 or adheres to others. This is a preferable state with less dust or adhesion of dust.

  When the adhesion oil 5 is attached to the surface of the inorganic porous layer 20 filled with the oil repellent fluid 4, as shown in FIG. 2, the contact interface between the surface of the inorganic porous layer 20 and the adhesion oil 5 is repellent. It is formed by the oily fluid 4 and the adhered oil 5. The general oil repellent surface is formed of a low surface energy solid material such as a fluororesin. Such a surface has the advantage that oil droplets do not adhere easily and can be easily wiped off, but the adhesion of oil droplets flying on an air current cannot be suppressed, and once adhered oil is fixed in place. As long as there is no removal operation (removal operation), there is no peeling. In the configuration of the first embodiment, the attached oil 5 is attached to the liquid surface of the oil-repellent fluid 4 instead of the conventional solid surface. For this reason, the adhered oil 5 can be easily moved by the flow of the liquid without being fixed to the surface. This movement requires a driving force, but the effect can be exhibited with a very small driving force such as gravity, electrostatic force, wind pressure due to airflow, etc. with respect to the adhered oil 5. FIG. 2 shows how the adhered oil 5 moves in the direction of the lubrication direction 6 due to gravity. As shown in FIG. 2, when the substrate 1 is tilted slightly, a gravity component acts on the adhered oil 5 below the tilt. Even with such a minute force, the adhered oil 5 gradually moves. On the other hand, the oil-repellent fluid 4 that is also a liquid exists in the inorganic porous layer 20 and is stabilized by capillary action, and therefore does not flow away even if the substrate 1 is tilted greatly.

  As the inorganic fine particles 2 in the first embodiment, for example, various kinds of oxides such as Si, Al, Ti, Cu, Ca, Mg, and Zr, nitrides, carbides, and the like can be used, but are not limited thereto. Is not to be done. For example, oxides such as silica, alumina, titania, zirconia, calcium oxide, nitrides such as boron nitride, silicon nitride, boron nitride, silicon nitride, gallium nitride, titanium nitride, lithium nitride, molybdenum carbide, tungsten carbide, vanadium carbide Carbides such as chromium carbide, tantalum carbide, titanium carbide, zirconium carbide, carbonates such as calcium carbonate and magnesium carbonate, sulfates such as calcium sulfate and magnesium sulfate, boehmite, smectite, kaolinite, montmorillonite, sericite, Clay minerals such as illite, glowconite, chlorite, talc and zeolite can also be used.

  For the formation of the inorganic porous layer 20, a metal oxide sol such as silica or alumina, various silicates such as sodium silicate or lithium silicate, a metal alkylate, a binder such as aluminum phosphate or ρ-alumina (binder, (Coupling agent) may be added to a dispersion medium in which the inorganic fine particles 2 are dispersed to produce a coating liquid to be applied to the surface of the substrate 1. In addition to the inorganic binders as described above, the strength of the inorganic porous layer 20 is not limited to organic binders such as epoxy, urethane, acrylic, phenol, melamine, polyester, silicone, and urea. Any material can be used as long as it can be obtained. When a binder is used, the binder weight is preferably 3% or more and 100% or less of the weight of the inorganic fine particles 2, and more preferably 5% or more and 40% or less. If it is less than 3%, the effect of adding a binder cannot be obtained. If the amount exceeds 100%, the pores of the inorganic porous layer 20 are reduced, and the oil-repellent fluid 4 may not be sufficiently impregnated, which is not preferable. The weights of the inorganic fine particles 2 and the binder here are calculated as those after curing as the inorganic porous layer 20.

  The average particle size of the inorganic fine particles 2 is not particularly limited, but the average particle size is preferably 0.3 μm or more and 100 μm or less, and more preferably 0.5 μm or more and 50 μm or less. If the average particle size is less than 0.1 μm, the inorganic porous layer 20 becomes too dense, and it becomes difficult to contain a sufficient amount of the oil-repellent fluid 4. When the average particle diameter exceeds 100 μm, the pores in the inorganic porous layer 20 become too large, and the oil repellent fluid 4 may not be stably held. Here, the average particle diameter is measured by a laser diffraction particle size distribution measuring apparatus.

  In addition, in the present application, an effect can be obtained even if the shape of the inorganic fine particles 2 is a shape close to a sphere, but a shape that is out of a sphere such as a needle shape or a plate shape is used as the inorganic porous layer 20. The film strength and the pore volume containing the oil-repellent fluid 4 are preferably compatible with each other. The particle shape can be confirmed by direct observation of particles using an electron microscope, an optical microscope, a wet flow type particle shape analyzer or the like. The ratio of the minor axis to the major axis of the particles is preferably 2.0 or more and 50.0 or less, more preferably 2.5 or more and 20.0 or less. When this ratio is less than 2.0, it is difficult to obtain the film strength with respect to the pore volume, and the oil-repellent fluid 4 tends not to be stably held. When this ratio exceeds 50, the film strength becomes weak and is not preferable in many cases.

The inorganic porous layer 20 has a thickness of preferably 0.5 μm or more and 2000 μm or less, and more preferably 1 μm or more and 50 μm or less. If it is less than 0.5 μm, the oil-repellent fluid 4 that can be impregnated decreases, and the effect is often not obtained. When the film thickness exceeds 2000 μm, it is possible to form a surface that can provide a desired effect, but the inorganic porous layer 20 is made to be oil-repellent or impregnated with the oil-repellent fluid 4 by the oil-repellent film 3. There are cases where it is not preferable in terms of process and cost, for example, that a long process is required to perform uniformly to the inside of 20 films, and that a large amount of material corresponding to the thickness is required. .
Note that the pore size of the inorganic porous layer 20 is preferably 0.5 μm or more and 50.0 μm or less, and more preferably 1.0 μm or more and 25.0 μm or less. When the pore size is less than 0.5 μm, it is difficult to obtain the lubricity of the adhered oil due to the fluidity of the oil repellent fluid. When the pore size exceeds 50 μm, the retention of the oil repellent fluid is lowered, which is not preferable. Here, the pore size is a value measured by a mercury intrusion method.

  The “step of forming an inorganic porous layer by applying an inorganic fine particle dispersion” in step S1 of FIG. 5 is performed by applying a coating liquid containing inorganic fine particles 2 and a binder to the surface of the substrate 1. The inorganic porous layer 20 is formed by forming a film in close contact with the substrate 1 by the coating liquid adhering to the surface of the substrate 1 as a liquid and then drying. In the example of spray coating, the coating liquid adheres as fine droplets and is dried as it is, or a liquid film is formed on the surface of the substrate 1 and then dried. Drying may be natural drying, or the drying time can be shortened by heating with airflow or infrared rays. The inorganic porous layer 20 is formed by bonding the inorganic fine particles 2 together. Further, if the binder component is present in the dispersion medium constituting the coating liquid, the bonding strength between the inorganic fine particles 2 is increased, and the strength of the inorganic porous layer 20 is further improved. In the bonding between the inorganic fine particles 2, the state of the inorganic porous layer 20 differs depending on the arrangement of the individual inorganic fine particles 2. If the inorganic fine particles 2 are difficult to aggregate even in the drying process as a liquid film in the dispersion medium, the inorganic fine particles 2 are arranged at a high density, the strength of the inorganic porous layer 20 is increased, and the pore volume is increased. There is a tendency to become smaller. By appropriately agglomerating the inorganic fine particles 2 in the dispersion medium, the pore volume of the formed inorganic porous layer 20 can be appropriately increased. For example, by adding a polyvalent ion such as calcium ion, magnesium ion or aluminum ion, a polymer such as polyacrylamide, or an aggregating agent such as a surfactant to the dispersion medium, the inorganic fine particles 2 can be appropriately adjusted. The pore volume of the inorganic porous layer 20 is increased by an aggregating method or a method of drying before the inorganic fine particles 2 are arranged by increasing the drying speed by blowing warm air at the time of drying. 4 can be easily penetrated and retained, and the performance of the inorganic porous layer 20 can be improved.

  The liquid used as the dispersion medium constituting the coating liquid can be either aqueous or organic solvent. The amount of the inorganic fine particles 2 in the coating liquid is preferably 0.1% or more and 40% or less, and more preferably 0.2% or more and 30% or less by weight. When the weight ratio exceeds 40%, it is difficult to form a homogeneous film or the film is likely to be too thick. Further, in the case of brush coating, surface irregularities due to spray particles are easily formed in the case of brush eyes and in the case of spraying. In such a non-uniform film or a film with surface irregularities, homogeneous filling may be difficult, for example, the oil-repellent fluid 4 is reduced at the convex portions or excessive oil-repellent fluid 4 is oozed out at the concave portions. is there.

  Step “S2” in FIG. 5 is performed by covering the surfaces of the inorganic fine particles 2 and the binder with the fluorine compound constituting the oil repellent film 3. Thus, the surface of the inorganic fine particles 2 and the binder is not exposed, and the material exposed on the surface is a fluorine compound constituting the oil repellent film 3. As the oil repellent film 3, a low molecular weight oil repellent having a fluoroalkyl group and a silanol group can also be used. However, the method of covering the surface with an oil repellent resin such as a fluororesin is not suitable for the inorganic fine particles 2 by friction or the like. It is preferable because the oil-repellent surface is difficult to be exposed and the effect of suppressing the detachment of the inorganic fine particles 2 is obtained. Examples of oil-repellent resins include PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), CTFE (polychlorotrifluoroethylene), PVF (polyvinyl fluoride), ETFE (ethylene-tetrafluoroethylene copolymer). , FEP (perfluoroethylene-propylene copolymer), ECTFE (ethylene-chlorotrifluoroethylene copolymer), PCTFE (polychlorotrifluoroethylene), TFE / PDD (tetrafluoroethylene-perfluorodioxole copolymer) Or a mixture thereof.

  As an oil-repellent resin, it is particularly soluble in fluorine-based solvents such as PFA, CTFE, and ECTFE, such as HFE (hydrofluoroether), HCFC (hydrochlorofluorocarbon), HFC (hydrofluorocarbon), and HFC (hydrofluorocarbon). A resin insoluble in ethanol and NMP (N-methylpyrrolidone) is preferable. When applied as a solvent, the inside of the pores in the inorganic porous layer 20 is also easily made oil-repellent uniformly. When a resin soluble in ethanol or NMP is used, the oil repellency is not sufficient even as a fluororesin, and after the surface structure having the oil lubricity of the present invention is formed, the oil is adhered and left for a long time. In this case, it is not preferable because the phenomenon that oil penetrates into the inorganic porous material is observed.

  Even if the oil-repellent resin is insoluble in a solvent, it can be applied as a dispersion of fine particles in the solvent. After application, the resin can be sufficiently dissolved by heating to achieve sufficient oil repellency in the present invention. Heating is preferably 80 ° C. or higher and 350 ° C. or lower, more preferably 120 ° C. or higher and 300 ° C. or lower. Below 80 ° C, sufficient oil repellency cannot be obtained. Above 350 ° C., the oil repellency often deteriorates due to the decomposition of the fluororesin. The coating solution in this case needs to be dispersed in a single solvent or a mixed solvent having a polarity lower than that of ethanol. In order to disperse in a polar solvent such as water, it is necessary to contain a polar group in the resin or to use a surfactant. If these are included, after forming the surface structure having oil lubricity according to the present invention, when the oil is allowed to adhere and left for a long time, the phenomenon that the oil penetrates into the inorganic porous material is not preferable. .

  Low molecular oil repellent agents can also be used. As the low-molecular oil repellent, those having a site that reacts with a hydroxyl group such as an alkoxysilyl group, a carboxyl group, or a silazane group and having a fluorinated alkyl group can be used. The low molecular weight oil repellent can be reacted with the inorganic porous material as it is or as a solution.

  The low molecular weight oil repellent can be used alone, but by mixing an appropriate amount with the oil repellent resin, the surface structure having the oil lubricity of the present invention was formed while taking advantage of the oil repellent resin. The phenomenon that oil permeates into the inorganic porous layer 20 can be surely suppressed against the oil adhesion. For the purpose of mixing the low molecular weight oil repellent and the oil repellent resin for this purpose, the low molecular weight oil repellent is preferably mixed in an amount of 1% or more and 30% or less of the oil repellent resin by weight. More preferably, the mixing amount is 20% or less. When the mixing amount is less than 1%, the effect of addition is not recognized. When the mixing amount exceeds 30%, unreacted reactive groups are likely to remain in the resin, leading to oil permeation.

  It is also preferable to use an oil-repellent resin having a reactive group that reacts with a hydroxyl group on the surface of inorganic fine particles. As the reactive group, those similar to the low molecular weight oil repellent can be used. It is bonded to the end of the molecular chain or the side chain of the oil repellent resin. The optimum amount of reactive groups can be defined by the number of reactive groups per weight of resin. 0.1 mol or more and 2.0 mol or less are preferable with respect to the oil-repellent resin per kg, and 0.5 mol or more and 1.0 mol are more preferable. The reactive group may be adjusted by mixing a resin having a reactive group and a resin not having the reactive group. If the reactive group is less than 0.1 mol, the effect of adding is not recognized. When the amount of reactive groups exceeds 2.0 mol, unreacted reactive groups are likely to remain in the resin, leading to oil permeation.

  The oil-repellent fluid 4 in the first embodiment has fluidity at the use temperature, does not have volatility, and needs to be a liquid that is not compatible with water or oil. Regarding fluidity, the kinematic viscosity at 20 ° C. is preferably 20 cSt or more and 1000 cSt or less, and more preferably 30 cSt or more and 500 cSt or less. If the kinematic viscosity is less than 20 cSt, the fluidity is too high, and when another object comes into contact with the surface structure, it moves from the inorganic porous layer 20 to the other object surface, and the amount in the inorganic porous layer 20 decreases. Or contaminating other objects. In addition, when the kinematic viscosity exceeds 1000 cSt, it is preferable because the lubrication speed of the attached oil becomes slow and it may take too much time to remove the oil from the surface, or it may not be possible to remove in the case of a small amount of oil. Absent. As for volatility, it is sufficient that there is no significant weight loss at the use temperature. For example, there is no problem if the weight loss when applied on a tray and exposed to hot air at 120 ° C. for 20 hours is 10% or less. As the oil-repellent fluid 4, various fluids can be used as long as they have the above-mentioned characteristics. Examples thereof include various PFPE (perfluoropolyether) (fluorine oil). Those having a side chain, those having different molecular weights, or a mixture thereof can be appropriately mixed and used.

  The “step of impregnating the oil-repellent fluid into the inorganic porous layer” in step S3 of FIG. 5 can be any method such as brush coating, dipping, spraying, etc. Application is preferred. When the oil repellent fluid 4 is brought into contact with the oil repellent inorganic porous layer 20, the oil repellent fluid 4 enters the pores of the inorganic porous layer 20 by capillary action. Even if it contacts only a part of the inorganic porous layer 20, it gradually diffuses throughout, but in many cases, such as when the viscosity of the oil repellent fluid 4 is high, it takes a very long time and is not preferable. If the oil-repellent fluid 4 is adhered so as to cover the entire surface of the inorganic porous layer 20 by spraying or the like, it can be impregnated uniformly in a short time. If the permeation of the oil-repellent fluid 4 is slow even using these methods, the speed can be increased by dissolving the oil-repellent fluid 4 in a fluorine-based solvent such as HFE, HCFC, HFC, or HFC and applying it. is there. Furthermore, the controllability of the coating amount can be improved. As a method for improving the permeation rate of the oil-repellent fluid 4, it is also effective to heat the oil-repellent fluid 4 during application.

  As described above, the coating material 100 according to the first embodiment of the present invention manufactured by this manufacturing method has the oil attached to the substrate 1 without any special work, and also has wear resistance. It is possible to obtain a surface structure having an effect, and to impart effects to various substrates including plastics. Below, an Example and a comparative example are described and the effect of the coating material 100 which concerns on Embodiment 1 of this invention is compared.

Example 1.
Necklace-shaped colloidal silica (manufactured by Nissan Chemical Industries, Snowtex PS-M) having a particle size of about 0.1 μm as the inorganic fine particles 2 is 5.0 mass% as a solid content, and lithium silicate (manufactured by Nissan Chemical Industries, Ltd. as a binder) The inorganic porous layer 20 was formed by apply | coating the water dispersion liquid which contains 1.0 mass% as solid content to LSS-35) on the glass plate which comprises the board | substrate 1 by spray coating, and drying naturally. .
The inorganic porous layer 20 was spray-coated with a fluororesin coating liquid (manufactured by Sumitomo 3M, Novec2702) to form the oil repellent film 3 and make it oil repellent. Thereafter, perfluoropolyether having a kinematic viscosity of 38 cSt at 20 ° C. (Fomblin Y04, manufactured by Solvay Specialty Polymers Japan) was spray applied as the oil repellent fluid 4.
Through the above steps, a translucent white turbid film was obtained as the coating material 100. The film did not peel or break even when rubbed with a finger, and there was no feeling that the finger was sticky. A film having excellent film strength and stability was obtained.
The glass plate on which the film was formed was fixed with a gentle inclination of 10 · from the horizontal, and salad oil was dropped with a 20 μl dropper. The oil droplets moved downward at a high speed of about 50 mm per minute. High oil slidability with oil droplets moving despite the very gentle angle was obtained. Further, when the oil droplets were left attached, they did not stick after one week.

Comparative Example 1
When the oil repellent fluid 4 was applied to the inorganic porous layer 20 of Example 1 without the fluororesin coating, a similar cloudy film was obtained. When salad oil was dropped into this, it was found that the transparency of the film at the dropping portion increased and the oil soaked into the inorganic porous layer 20. The oil did not move even if it was tilted.

Comparative Example 2
The inorganic porous layer 20 of Example 1 was not formed, and the oil-repellent fluid 4 was applied on the fluororesin coating. A transparent film was obtained. When the salad oil was dripped, the oil did not move even if it was in close contact and tilted.

Comparative Example 3
A film was formed in the same manner as in Example 1 using a 5% by mass aqueous dispersion of spherical colloidal silica (manufactured by Nissan Chemical Industries, Snowtex 30) having a particle size of about 15 nm as the inorganic fine particles 2. It became a cloudy film with uneven transparency. Although oil slidability was recognized, the moving speed varied greatly depending on the part. This is because the inorganic fine particles 2 are too small to be satisfactorily impregnated with the oil repellent fluid 4.

Comparative Example 4
In the film of Example 1, Fomblin YR having a kinematic viscosity of 1300 cSt was used as the oil repellent fluid 4. The moving speed of the oil was evaluated under the conditions of Example 1, but the moving speed was extremely slow and was about 1 mm per minute. This is because the viscosity of the oil repellent fluid 4 is too high.

Example 2
As the inorganic fine particles 2, plate-like boehmite (made by Kawai Lime Industry, Cerasur BMM) having a particle diameter of about 1 μm is solid as 3.0% by mass, and colloidal silica (Nissan Chemical Industries, Snowtex XS) is used as the binder. The inorganic porous layer 20 was formed by apply | coating the aqueous dispersion liquid containing 1.0 mass% as a part on a glass plate by spray application, and drying naturally. In the same manner as in Example 1, a fluororesin coating and an oil repellent fluid 4 were applied thereto.
A cloudy film was obtained, and the film did not peel or break even when rubbed with a finger, and there was no feel that the finger was sticky. A film having excellent film strength and stability was obtained. The glass plate on which the film was formed was fixed with a gentle inclination of 10 · from the horizontal, and salad oil was dropped with a 20 μl dropper. The oil droplets moved downward at a high speed of about 40 mm per minute. High oil slidability with oil droplets moving despite the very gentle angle was obtained. When the oil droplets were left attached, they did not stick after one week.

Example 3 FIG.
In the same manner as in Example 2, an inorganic porous layer 20 was formed. An ethanol solution of a silane coupling agent having fluoroalkyl group and alkoxysilyl group; (Heptadecafluoro-1,1,2,2-tetrahydrodecyl) Triethoxysilane was applied thereto, and heated with 80 ° C. hot air for 5 minutes. Thereafter, perfluoropolyether (Solvay Specialty Polymers Japan, Fomblin Y04) was spray applied as the oil repellent fluid 4.
As in Example 2, a cloudy film having excellent film strength and stability was obtained. When the salad oil was added dropwise, it moved at a speed of about 25 mm per minute, and a high oil sliding property was obtained. When left with oil droplets attached, it did not stick for several days, but a slight oil stain was observed after that, but there was no problem in practical use.

Example 4
An inorganic porous layer 20 was formed in the same manner as in Example 2. After heating the inorganic porous layer 20 with hot air of 150 ° C. so that the surface temperature becomes 100 ° C. or higher, the oil repellent fluid 4 is perfluoropolyether (Folblin Y04, manufactured by Solvay Specialty Polymers Japan). What mixed 30 mass% of silane coupling agents was spray-coated. Then, it heated for 10 minutes in 100 degreeC oven.
As in Example 2, a cloudy film having excellent film strength and stability was obtained. When the salad oil was added dropwise, it moved at a speed of about 30 mm per minute, and a high oil slidability was obtained. When left with oil droplets attached, it did not stick for several days, but a slight oil stain was observed after that, but there was no problem in practical use.

Comparative Example 5
The same evaluation as in Example 4 was performed in a state where the hot air treatment before applying the oil repellent fluid 4 to the inorganic porous layer 20 was not performed.
As in Example 4, a white turbid film excellent in film strength and stability was obtained, but when salad oil was added dropwise, it moved at a speed of about 30 mm per minute, and high oil slidability was obtained. When the droplets were allowed to stand, oil soaked into the inorganic porous membrane after several hours.

Example 5 FIG.
As inorganic fine particles 2, alumina powder (produced by Showa Denko) having an average particle diameter of 1.2 μm is 5.0 mass%, and as a binder, a polyester resin emulsion (produced by Unitika, Elitel KA-5034) is 1.0 mass in solid content. % Aqueous dispersion was spray coated on the PP plate constituting the substrate 1.
After spray drying with hot air at 150 ° C., the oil-repellent fluid 4 is 30% by mass of perfluoropolyether having an alkoxysilane at the end of the molecular chain (Solvay Specialty Polymers Japan, Fomblin S10), perfluoropolyether (fomblin Y04) 70% by weight of the mixture was spray applied. Then, it heated at 60 degreeC for about 30 minutes.
A cloudy film having excellent film strength and stability was obtained. The salad oil droplets moved at a speed of about 40 mm per minute, and a high oil slidability was obtained. Even when left with oil droplets attached, it did not stick for 2-3 days. When the oil droplets were left for several days, a phenomenon was observed in which only a few fine oil droplets remained in the portion where the oil droplets had adhered after moving the oil droplets, but there was no practical problem.

Comparative Example 6
In Example 5, the evaluation was performed by omitting heating before and after the application of the oil-repellent fluid 4.
Immediately after the dropping of the salad oil droplets, high lubricity was obtained, but when the oil droplets were left for several hours without moving, the oil soaked into the inorganic porous membrane.

Example 6
Using the same material as in Example 2, an oil-lubricating surface structure was formed using the following method. The salad oil was applied very thinly on the surface of the glass plate as the substrate 1 so as to surround a 100 mm square. Then, the salad oil application part was masked, the inorganic porous layer 20 was formed in the 100 square mm square, and the oil-repellent fluid 4 was apply | coated. Thus, a region where the oil was thinly applied was formed so as to surround the oil-lubricating surface.
The glass plate was tilted 10 ° from the horizontal, and salad oil was dropped at the rate of about 1 drop in 30 seconds at the center of the lubricious surface. The oil droplets moved from the center to the outside intermittently. The dripping was continued for about 2 hours, but the portion where the oil droplets moved was slightly whitish, but high oil lubricity was maintained.

Comparative Example 7
In the same manner as in Example 6, it was performed without first applying salad oil. The oil-lubricated surface was formed on a glass plate in a square of 100 mm square, and the surface adjacent to the oil-lubricated surface was the glass plate as it was.
As in Example 6, when salad oil was continuously dripped, the oil-repellent fluid 4 moved to the glass surface along with the dripping and was not moved as oil droplets on the lubricious surface from around 1 hour. An oil film was formed. This is because the oil-repellent fluid 4 has flowed out to the adjacent glass surface.

  As described above, as shown in the examples 1 to 6, the coating material 100 manufactured by the manufacturing method according to the first embodiment of the present invention is such that the oil adhered to the substrate 1 is subjected to special work. Without performing, it is possible to obtain a surface structure having wear resistance, and as a base material constituting the substrate 1, the same effect can be imparted to various base materials including plastic.

As described above, the coating material 100 according to the first embodiment includes the inorganic porous layer 20 having a surface having oil repellency and a plurality of holes formed therein, and the pores of the inorganic porous layer 20. And an contained oil-repellent fluid 4.
Therefore, since the surface of the coating material 100, including the inner walls of the holes, has oil repellency, it does not stick even if the adhesion oil 5 adheres, and the adhesion oil 5 on the surface of the coating material 100 does not adhere. Easy to move and peel. Further, the inorganic porous layer 20 has an effect of holding the oil-repellent fluid 4 by an internal hole and a recess formed on the surface, and further has an effect of exerting the strength of the surface. Further, since the inorganic porous layer 20 itself has oil repellency on its surface, there is an advantage that even if the inorganic porous layer 20 is exposed from the oil repellant fluid 4, there is no action of promoting oil adhesion. . On the other hand, when an organic porous material is used, a flat surface is formed due to wear or the like, and oil adheres easily. In the first embodiment, however, such a phenomenon is avoided by using an inorganic porous material. it can.
Therefore, according to the first embodiment, the attached oil 5 attached to the surface of the coating material 100 moves and is removed with very weak force such as gravity, electrostatic force, and wind pressure due to air current without sticking to the surface. become able to. For example, by inclining the surface of the coating material 100, the adhered oil 5 can be naturally dropped only by gravity. Further, by applying the wind to the surface of the coating material 100, the adhered oil 5 can be moved and removed by the wind pressure. As a result, the operation of removing the adhered oil 5 is not necessary or can be greatly simplified. Moreover, since it is based on the formation of the oil-repellent film 3 of the inorganic fine particles 2, it is excellent in wear resistance, and various substrates such as plastics can be used as a coating target. It becomes possible.

  Moreover, in this Embodiment 1, the oil-repellent fluid 4 is comprised from the fluorine oil. Therefore, since the surface of the coating material 100 becomes the oil-repellent fluid 4, even if the adhesion oil 5 adheres, it does not adhere to the surface of the coating material 100, and movement and peeling on the surface become easy. The inorganic porous material on the oil repellent surface has the effect of retaining the oil repellent fluid 4 and the effect of expressing the strength of the surface. Moreover, even if exposed from the oil-repellent fluid 4, there is an advantage that there is no effect of promoting oil adhesion. In the organic porous material, a flat surface is formed due to abrasion or the like, and oil adheres easily. However, in the first embodiment, such a phenomenon can be avoided by using the inorganic porous material.

  Moreover, the manufacturing method of the coating material by this Embodiment 1 applies the inorganic fine particle dispersion liquid which disperse | distributed the inorganic fine particles 2 in the liquid to the surface of the board | substrate 1 of coating object, Then, the said liquid is dried, Step S1 in which an inorganic porous layer 20 having a plurality of pores is formed on the surface of the substrate 1, and an oil repellent film 3 made of an oil repellent agent is attached to the surface of the inorganic fine particles 2 constituting the inorganic porous layer 20 Thus, there are provided step S2 for performing the oil repellency treatment on the surface of the inorganic porous layer 20 and step S3 for impregnating the oil repellent fluid 4 into the plurality of holes of the inorganic porous layer 20. Therefore, the coating material by this Embodiment 1 can be given to various articles | goods as a coating object, and the effect which is excellent in the removal property of the adhesion oil 5 by coating can be provided. Moreover, the inorganic porous layer 20 which has the oil-repellent surface which has high intensity | strength is obtained.

Embodiment 2. FIG.
In the second embodiment, the coating material shown in the first embodiment of the present invention is applied to the motor of the cutting machine to confirm the state of contamination. 6 and 7 show the structure of the motor. 6 is a longitudinal sectional view of the motor, and FIG. 7 is a transverse sectional view of the motor. As shown in FIGS. 6 and 7, the motor main body 9 has heat radiation fins 11 provided on the outer surface thereof. In the example of FIGS. 6 and 7, the radiation fins 11 are installed to face the upper end portion of the motor body 9. The motor body 9 is covered with a cover 10. An air passage is formed by the motor body 9 and the cover 10. That is, the gap between the outer surface of the motor body 9 and the inner surface of the cover 10 is a ventilation path. The heat radiating fins 11 installed on the upper end portion side of the motor main body 9 generate an air flow in the ventilation path to cool the motor main body 9.

  In the second embodiment, the coating of the first embodiment is applied to the motor of the cutting machine shown in FIGS. 6 and 7. Specifically, the entire outer surface (excluding the shaft) including the heat radiation fins 11 of the motor body 9 was coated. The motor was then operated for 24 hours to confirm the contamination status.

  In operation of the cutting machine, mist such as cutting fluid is generated, and the mist gradually accumulates as dirt on the motor portion, thereby deteriorating the heat radiation performance. By measuring the temperature of the outer surface of the cover 10 during operation of the motor, the degree of dirt accumulation was evaluated. Prepare two motors for cutting the same parts that have been disassembled and cleaned, apply the coating material according to Embodiment 1 of the present invention to one side, and perform the experiment under the same conditions without applying the coating material to the other side. And made a comparison.

  In the experiment, the temperature of the outer surface of the cover 10 during motor operation was measured with a radiation thermometer. After a total of about 1000 hours of operation, the temperature of the outer surface of the cover 10 was 58 ° C. for a motor without coating and 52 ° C. for a motor with coating. The temperature difference was 6 ° C., and the temperature of the uncovered motor cover 10 was higher. After a total of about 1600 hours of operation, it was 66 ° C. for a motor without a coating and 55 ° C. with a coating. The temperature difference was 11 ° C., and the temperature of the cover 10 of the uncoated motor was again higher. The longer the operating time, the greater the temperature difference. It has been found that the temperature rise of the cover 10 is caused by a decrease in cooling performance due to accumulation of cutting oil mist or the like in the ventilation path. Therefore, as a result of the experiment, it was found that the temperature of the uncovered motor cover 10 was higher than that of the coated motor cover 10, and thus the cooling performance of the uncoated motor was lowered. It was. From the above, it has been confirmed that the coating of the present invention can suppress contamination.

Embodiment 3 FIG.
An oil repellent is added to the oil repellent fluid 4 in place of the “oil repellency treatment process on the surface of the inorganic porous layer with a fluorine compound” in step S2 of FIG. 5 described in the first embodiment. Thus, it is possible to obtain a surface structure excellent in the removability of the adhered oil 5. In this case, steps S2 and S3 shown in the first embodiment can be performed simultaneously. In addition, the oil repellency agent here has a site | part which reacts with hydroxyl groups, such as an alkoxy silyl group, a carboxyl group, and a silazane group, as a low molecular oil repellency agent, and a thing provided with a fluorinated alkyl group can be utilized. . In addition, a reactive group that reacts with the same hydroxyl group as that of the oil-repellent resin may be used by bonding to the terminal or side chain of the molecular chain of the oil-repellent resin.

  The optimum amount of reactive groups to be added to the oil repellent fluid 4 can be defined by the number of reactive groups per weight of the oil repellent fluid 4. 0.1 mol or more and 2.5 mol or less are preferable with respect to the oil-repellent fluid 4 per kg, and 0.3 mol or more and 2.0 mol are more preferable. If the reactive group is less than 0.1 mol, the oil repellency cannot be sufficiently achieved. When the amount exceeds 2.5 mol, the oil repellency of the oil repellent fluid 4 is reduced, or it acts as a surfactant with respect to the attached oil, and the attached oil 5 spreads on the surface, or the inorganic porous layer 20 There is a risk of penetration.

  In the case where the inorganic porous layer 20 is impregnated with the oil-repellent fluid 4 to which the reactive group is added, there is a preferable method. Before the impregnation with the oil repellent fluid 4, the inorganic porous layer 20 is sufficiently dried with warm air to obtain a surface structure excellent in the removability of the adhered oil 5. If moisture remains on the surface of the inorganic porous layer 20, the moisture reacts with a reactive group in the oil-repellent fluid 4, and a free polar group remains after the reaction, or a hydroxyl group on the surface of the inorganic porous layer 20 remains. It may be in a state that does not respond sufficiently. In such a state, after the surface structure having oil lubricity by the coating material 100 is formed, a phenomenon that oil penetrates into the inorganic porous layer 20 easily occurs, which is not preferable. The temperature of the warm air for drying the inorganic porous layer 20 is preferably 60 ° C. or higher and 300 ° C. or lower, and more preferably 100 ° C. or higher and 200 ° C. or lower. If the temperature of the hot air is less than 60 ° C., moisture cannot be removed sufficiently. A temperature exceeding 300 ° C. is not preferable because surface alteration such as a dehydration reaction occurs on the surface of the inorganic porous layer 20 or deterioration of the substrate 1 occurs.

  It is desirable to impregnate the inorganic porous layer 20 with the oil-repellent fluid 4 immediately after drying the inorganic porous layer 20. A method of impregnation by spraying with dry air is preferred. After applying an appropriate amount of the oil repellent fluid 4, the reaction between the reactive group and the inorganic porous material can be promoted by heat treatment. The heating in this case can use hot air blowing or infrared heating, and the temperature of the inorganic porous layer 20 impregnated with the oil repellent fluid 4 is preferably 60 ° C. or higher and 300 ° C. or lower, and 100 ° C. As mentioned above, it is still more preferable that it is 200 degrees C or less. The temperature in this case can be measured by the surface temperature by a radiation thermometer.

  As described above, the manufacturing method of the coating material according to the third embodiment applies the inorganic fine particle dispersion liquid in which the inorganic fine particles are dispersed in the liquid to the surface of the coating target, and then dries the liquid. Forming an inorganic porous layer having a plurality of pores on the surface of the substrate; and impregnating an oil repellent fluid having an oil repellent added into the plurality of pores of the inorganic porous layer. I have. Thereby, steps S2 and S3 in the first embodiment can be performed together in one step, and the oil repellency treatment step with the fluorine compound in step S1 in the first embodiment can be omitted.

Embodiment 4 FIG.
In the present embodiment, as shown in FIG. 4, an embodiment will be described in which a peripheral member 8 having lipophilicity or oil absorption is provided in the peripheral portion of the coating material 100 described in the first to third embodiments. By installing such a peripheral member 8, the deterioration of the lubricity with respect to the adhered oil 5 is suppressed. When the adhering oil 5 moves from the inorganic porous layer 20 to the peripheral member 8, the adhering oil 5 and the oil repellent fluid 4 are separated by the peripheral member 8. Thus, since only the oil-repellent fluid 4 is returned to the inorganic porous layer 20, it is possible to prevent the oil-repellent fluid 4 from flowing out of the inorganic porous layer 20 together with the adhering oil 5. Thus, the peripheral member 8 constitutes an outflow prevention member for preventing the oil repellent fluid 8 from flowing out together with the adhering oil 5.

  This will be described with reference to FIGS. The adhering oil 5 adhering to the surface structure constituted by the coating material 100 described in the first to third embodiments is lubricated as oil droplets and finally discharged to the outside of the surface structure.

  FIG. 3 shows a comparative example with respect to the fourth embodiment. In FIG. 3, the peripheral part of the coating material 100 is constituted by a peripheral member 7 having affinity for the oil-repellent fluid 4. Now, as shown in FIG. 3, a state in which the adhered oil 5 has moved from the coating material 100 to the peripheral member 7 is considered. At this time, since the peripheral member 7 has an affinity for the oil-repellent fluid 4 with respect to the oil-repellent fluid 4 attached to the attached oil 5, from the inorganic porous layer 20 to the peripheral member 7 together with the attached oil 5. Moving. By repeating this, the oil-repellent fluid 4 in the inorganic porous layer 20 is gradually lost, the lubricity of the attached oil 5 is lowered, and the initial removability of the attached oil 5 is lowered. Even when the peripheral member 7 does not have an affinity for the oil-repellent fluid 4 in the initial stage, the affinity may increase. The main reason why the peripheral member 7 becomes highly compatible with the oil-repellent fluid 4 is that the peripheral member 7 is also made oil-repellent at the same time by the oil-repellent treatment of the inorganic porous layer 20 or the like. Even if not, it can be mentioned that the surface is covered with the oil-repellent fluid 4 due to protrusion or contamination when the oil-repellent fluid 4 is applied.

  In order to suppress the loss of the oil-repellent fluid 4, in the fourth embodiment, a peripheral member 8 having lipophilicity or oil-absorbing property is installed as a peripheral member disposed adjacent to the coating material. FIG. 4 shows a configuration in the case where the peripheral portion of the coating material 100 according to the fourth embodiment is configured by a peripheral member 8 having lipophilicity or oil absorption properties. FIG. 4 shows a state where the adhered oil 5 has moved from the coating material 100 to the peripheral member 8. As shown in FIG. 4, when the adhering oil 5 adhering to the coating material 100 moves relative to the peripheral member 8, since the peripheral member 8 has lipophilicity or oil absorption, only the adhering oil 5 is in the periphery. The oil repellent fluid 4 adsorbed by the member 8 and moved together with the adhering oil 5 is separated here and pulled back toward the original inorganic porous layer 20. FIG. 4 shows the state of the peripheral member 8 that is not oil-absorbing. If the peripheral member 8 is oil-absorbing, the adhering oil 5 penetrates into the peripheral member 8, and the oil-repellent fluid 4 is It is separated and pulled back to the original inorganic porous layer 20. The oil absorbing peripheral member 8 is more excellent in separation ability between the adhering oil 5 and the oil repellent fluid 4 than the simple lipophilic peripheral member 8. Further, when the surface of the oleophilic peripheral member 8 is contaminated with the oil repellent fluid 4, the separability is lowered. However, by using the oil absorbing peripheral member 8, the surface of the lipophilic peripheral member 8 is reduced with the oil repellent fluid 4. It is possible to prevent the separation ability from being deteriorated even if it is contaminated.

  Here, as the peripheral member 8 having lipophilicity, for example, a resin such as polyolefin, polystyrene, acrylic, or ABS, a coating film, an inorganic material such as glass or stone, or a metal such as stainless steel or aluminum can be used. Even in these cases, if the oil-repellent fluid 4 adheres and is contaminated, there is a possibility that separation ability from oil cannot be obtained. By attaching oil in advance, this can be prevented and a more stable effect can be obtained. As the oil to be adhered in advance, various surfactants can be used in addition to hydrophobic liquid substances such as various mineral oils, vegetable oils, and silicone oils. Any material having higher affinity for the adhered oil 5 than the oil repellent fluid 4 may be used. The oil can be attached by brushing or spraying, as in the case of painting, but since a very small amount of application is possible, there is also a method of attaching by impregnating something soaked in a porous material such as cloth or sponge. preferable.

  Further, as the peripheral member 8 having the oil absorbing property, the peripheral member 8 having the above-described lipophilic property in which minute holes and cuts are installed so that the oil enters by capillary action, the inorganic porous layer 20, Organic porous materials such as nonwoven fabric and paper can be used. Since these materials have a property of absorbing the oil-repellent fluid 4 in contact therewith, it is desirable that oil be attached or contained in advance in order to prevent this. The type of oil is the same as above. In addition to the method of simply including oil by coating or the like, there is a method of maintaining the voids of the peripheral member 8 by diluting with oil and then including the oil.

As described above, in the fourth embodiment, the coating material 100 described in the first to third embodiments, the substrate 1 as a coating target provided with the coating material 100 on the surface, and the surface of the substrate 1. The peripheral member 8 is provided adjacent to the coating material 100 and has an oleophilic or oil-absorbing property and prevents the oil-repellent fluid 4 from flowing out to the outside.
Generally, when the adhering oil 5 moves on the surface of the coating material 100, the oil-repellent fluid 4 also moves together with the adhering oil 5, so that the oil-repellent fluid 4 may decrease as the adhering oil 5 is removed. For this reason, in the present embodiment, the peripheral member 8 having lipophilicity or oil-absorbing property is installed adjacent to the coating material 100, so that only the adhered oil 5 is removed from the surface structure, and the oil repellent fluid 4 Can remain in the inorganic porous layer 20, retain the initial removability to the adhered oil 5, and obtain a surface structure in which excellent removability is sustainable.

Claims (6)

An inorganic porous layer having a surface having oil repellency and a plurality of pores formed therein;
A coating material comprising: an oil repellent fluid contained in the pores of the inorganic porous layer. The coating material according to claim 1, wherein the oil-repellent fluid is made of fluorine oil. An inorganic fine particle dispersion in which inorganic fine particles are dispersed in a liquid is applied to the surface of the coating target, and then the liquid is dried to form an inorganic porous layer having a plurality of pores on the surface of the coating target. Forming step;
Impregnating an oil repellent fluid into the plurality of pores of the inorganic porous layer. The coating material according to claim 3, further comprising a step of performing an oil repellency treatment on the surface of the inorganic porous layer by attaching an oil repellency agent to the surface of the inorganic fine particles constituting the inorganic porous layer. Production method. The method for producing a coating material according to claim 3, wherein an oil repellent agent is added to the oil repellent fluid. The coating material according to claim 1 or 2,
A coating object provided on the surface with the coating material;
An outflow prevention member that is provided on the surface of the object to be coated adjacent to the coating material, has lipophilicity or oil absorption, and prevents the oil repellent fluid of the coating material from flowing out to the outside. Surface structure with and.

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