JP2018035555A - Water-repellent surface material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-repellent surface material excellent in drainage performance and an antifouling property.SOLUTION: A water-repellent surface material 1 comprises a drainage structure part 10 being 90 degrees or more in a water contat angle of a surface, and the drainage structure part 10 comprises a plurality of projection parts 11 and a plurality of recessed parts 12 juxtaposed alternately, and respective ones of the plurality of projection parts 11 and the plurality of recessed parts 12 extend in a line shape along the drainage direction, and are inclined along the drainage direction, and in a cross section orthogonal to the drainage direction, (a) an angle θ formed by two virtual straight lines L1 and L2 of connecting the apex P of the projection parts 11 and the respective lowest points Q1 and Q2 of the two recessed parts 12 adjacent to the projection parts 11 is 160 degrees or less, and (b) a height (h) from the lowest point Q of the apex P is 5 mm or less, and (c) a distance (d) between the adjacent apexes P is 8 mm-20 mm.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a water-repellent surface material.

  In the conventional bath floor, joints for improving drainage are formed, slipping is suppressed by drawing water into the joints, and the quick drying property of the floor is improved (for example, see Patent Document 1). . In the washing scene structure described in Patent Document 1, a hydrophilic treatment is applied to the surface of the concavo-convex structure forming the joint. As a result, the spread of the water is improved and water can be easily drawn into the joint, thereby improving the quick drying property.

JP 2008-82151 A

  However, in the washing scene structure described in Patent Document 1, water gets wet and spreads on the hydrophilic surface, so that scale easily adheres. Further, since the drainage direction and the joint intersect, a part of the water drawn into the joint remains as a droplet on the joint. The remaining droplets cause factors such as water scale and mold. As described above, the washing scene structure having a conventional joint has poor drainage and antifouling properties.

  On the other hand, if the surface is subjected to water repellency treatment, water does not spread out and the drainage can be maintained even without joints, so that the amount of water remaining on the surface can be reduced. However, there is a problem that minute droplets remain on the surface, and the remaining droplets cause factors such as water scale and mold.

  Then, an object of this invention is to provide the water-repellent surface material excellent in drainage property and antifouling property.

  In order to achieve the above object, a water-repellent surface material according to an aspect of the present invention includes a drainage structure portion having a water contact angle of 90 degrees or more on the surface, and the drainage structure portion includes a plurality of alternately arranged protrusions. Each of the plurality of protrusions and the plurality of recesses extends in a line shape along the drainage direction, and is inclined along the drainage direction. In an orthogonal cross section, (a) an angle formed by two imaginary straight lines connecting the vertex of the convex portion and the lowest point of each of the two concave portions adjacent to the convex portion is 160 degrees or less, and (b ) The height of the vertex from the lowest point is 5 mm or less, and (c) the distance between the adjacent vertices is 8 mm or more and 20 mm or less.

  ADVANTAGE OF THE INVENTION According to this invention, the water-repellent surface material excellent in drainage property and antifouling property can be provided.

It is a figure which shows the bathroom which applied the water-repellent surface material which concerns on Embodiment 1 to the floor. 3 is a top view of the water repellent surface material according to Embodiment 1. FIG. 3 is an enlarged perspective view showing a part of a drainage structure portion of a water-repellent surface material according to Embodiment 1. FIG. 3 is a cross-sectional view showing a partial cross section of the drainage structure portion of the water repellent surface material according to Embodiment 1. FIG. 5 is a cross-sectional process diagram illustrating a method for manufacturing a water-repellent surface material according to Embodiment 1. FIG. It is sectional drawing which shows the partial cross section of the drainage structure part of the water repellent surface material which concerns on the modification 1 of Embodiment 1. FIG. It is sectional drawing which shows the partial cross section of the drainage structure part of the water-repellent surface material which concerns on the modification 2 of Embodiment 1. FIG. It is sectional drawing which shows the partial cross section of the drainage structure part of the water-repellent surface material which concerns on the modification 3 of Embodiment 1. FIG. 5 is a top view of a water-repellent surface material according to Embodiment 2. FIG. It is a top view which expands and shows a part of drainage structure part of the water-repellent surface material which concerns on Embodiment 2. FIG. It is sectional drawing which shows a cross section parallel to the drainage direction of the drainage structure part of the water-repellent surface material which concerns on Embodiment 2. FIG. FIG. 10 is an enlarged perspective view showing a part of a drainage structure portion of a water repellent surface material according to a modification of the second embodiment. It is sectional drawing which shows a cross section parallel to the drainage direction of the drainage structure part of the water-repellent surface material which concerns on the modification of Embodiment 2. 6 is an enlarged perspective view showing a part of a drainage structure part of a water repellent surface material according to Embodiment 3. FIG. FIG. 10 is an enlarged perspective view showing a part of a drainage structure part of a water repellent surface material according to a modification of the third embodiment.

  Below, the water-repellent surface material which concerns on embodiment of this invention is demonstrated in detail using drawing. Each of the embodiments described below shows a specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Therefore, for example, the scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code | symbol is attached | subjected about the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

  In the present specification and drawings, the x axis, the y axis, and the z axis indicate the three axes of the three-dimensional orthogonal coordinate system. In each embodiment, the z-axis direction is the vertical direction, and the direction perpendicular to the z-axis (the direction parallel to the xy plane) is the horizontal direction. In each embodiment, the three axes are set so that the thickness direction of the water-repellent surface material is the z-axis direction and one of the one or more drainage directions of the water-repellent surface material is parallel to the x-axis or the y-axis. Assigned.

(Embodiment 1)
[Overview]
First, the outline of the water-repellent surface material 1 according to Embodiment 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a view showing a bathroom 90 in which the water-repellent surface material 1 according to the present embodiment is applied to a floor 91. FIG. 2 is a top view of the water-repellent surface material 1 according to the present embodiment.

  The water-repellent surface material 1 according to the present embodiment is applied to a floor 91 of a bathroom 90 as shown in FIG. Specifically, the water repellent surface material 1 is applied as a surface material of a floor material constituting the floor 91.

  The water repellent surface material 1 includes a drainage structure 10 as shown in FIG. The drainage structure 10 has a water contact angle of 90 ° or more on the surface, and has water repellency. The drainage structure 10 drains in one or more predetermined drainage directions. In FIG. 2, a plurality of white arrows indicate the direction of drainage of the drainage structure 10.

  In the present embodiment, as shown in FIGS. 1 and 2, a drain 91 is provided on the floor 91 of the bathroom 90. The water repellent surface material 1 is configured so that the direction of drainage is directed toward the drainage port 92.

  The water repellent surface material 1 may be provided on the bottom 94 of the bathtub 93 of the bathroom 90 shown in FIG. The water-repellent surface material 1 is not limited to the bathroom 90, and may be used for the bottom of a sink or sink such as a sink or kitchen, a drain, or a floor of a room or a passage.

  Below, the structure of the drainage structure part 10 of the water repellent surface material 1 is demonstrated in detail.

[Constitution]
As shown in FIG. 2, the drainage structure portion 10 includes a plurality of convex portions 11 and a plurality of concave portions 12 that are alternately arranged. In FIG. 2, the vertex of the convex portion 11 is indicated by a solid line, and the lowest point of the concave portion 12 is indicated by a broken line.

  In the present embodiment, the top view shape of the water repellent surface material 1 is substantially the same as the shape of the floor 91, for example, a rectangle. The drainage port 92 is located at substantially the center of one side of the water-repellent surface material 1 (floor 91), and the water flows through the drainage structure portion 10 of the water-repellent surface material 1 from three directions toward the drainage port 92. It is configured as follows.

  Specifically, the drainage structure 10 includes three drainage structures 10a to 10c having different drainage directions. Each of the drainage structures 10 a to 10 c has a plurality of convex portions 11 and a plurality of concave portions 12. In the present embodiment, each of the plurality of convex portions 11 and the plurality of concave portions 12 is provided in a stripe shape, that is, in parallel with each other when viewed from above.

  In the drainage structure portion 10a, the convex portions 11 and the concave portions 12 extending along the x axis are provided in stripes in a top view so that the drain direction is the negative direction of the x axis. The convex portion 11 and the concave portion 12 of the drainage structure portion 10a are continuously and repeatedly provided along the y axis.

  In the drainage structure portion 10b, the convex portions 11 and the concave portions 12 extending along the y axis are provided in a stripe shape in a top view so that the drain direction is the positive direction of the y axis. The convex portion 11 and the concave portion 12 of the drainage structure portion 10b are repeatedly provided continuously along the x-axis.

  In the drainage structure portion 10c, the convex portions 11 and the concave portions 12 extending along the y axis are provided in a stripe shape so that the drain direction is the negative direction of the y axis. The convex portion 11 and the concave portion 12 of the drainage structure portion 10c are provided continuously and repeatedly along the x-axis.

  Each top view shape of the drainage structures 10a to 10c is substantially trapezoidal, and the height direction of the trapezoid substantially coincides with the drainage direction. Specifically, the top view shape of the drainage structure 10a is a substantially isosceles trapezoid. The top view shape of the drainage structures 10b and 10c is a substantially trapezoid with a base angle of 90 degrees.

  The drainage structure unit 10a shares one side (trapezoidal leg) with the drainage structure unit 10b, and shares the other side (other trapezoidal leg) with the drainage structure unit 10c. In addition, as shown in FIG. 2, the recessed part 12 extended along this one shared side is provided.

  In this Embodiment, since the structure of the drainage structure parts 10a-10c has the same shape mutually, it demonstrates as the drainage structure part 10 except the case where it needs to distinguish and explain especially.

  FIG. 3 is an enlarged perspective view showing a part of the drainage structure 10 of the water repellent surface material 1 according to the present embodiment. Specifically, FIG. 3 shows a region III of FIG. 2 in an enlarged manner.

  As shown in FIGS. 2 and 3, the drainage structure unit 10 has a direction (y-axis) in which peaks (convex portions 11) and valleys (concave portions 12) extending along the drainage direction (x-axis direction) intersect the drainage direction. And has a concavo-convex structure arranged continuously in the direction). One concave portion 12 is formed between two adjacent convex portions 11.

  The cross-sectional view shapes and sizes of the plurality of convex portions 11 are substantially equal to each other, and the cross-sectional view shapes and sizes of the plurality of recess portions 12 are substantially equal to each other. The length of each of the plurality of convex portions 11 in the direction of drainage depends on the shape of the drainage structure 10 and may be equal to or different from each other. The length of each of the plurality of recesses 12 in the drain direction is the same.

  Each of the plurality of convex portions 11 and the plurality of concave portions 12 extends in a line shape along the drainage direction (the positive direction of the x axis). For example, the convex part 11 has a substantially constant cross-sectional shape (in this embodiment, a triangle) and is a long ridge extending along the direction of drainage. The recess 12 is a long groove (specifically, a V-shaped groove) having a substantially constant cross-sectional shape (in the present embodiment, a triangle) and extending along the direction of drainage.

  In the present embodiment, the convex portion 11 is not provided with a groove that intersects the extending direction (x-axis direction). That is, the drainage structure portion 10 is not provided with grid-like convex portions or concave portions such as joints. Specifically, the convex portion 11 and the concave portion 12 of the drainage structure portion 10 are provided so as not to cross each other. For this reason, water can be effectively flowed in the direction along the convex part 11 and the concave part 12 (x-axis direction). That is, the direction along the convex portion 11 and the concave portion 12 is the drainage direction of the drainage structure portion 10.

  As shown in FIG. 3, the plurality of convex portions 11 and the plurality of concave portions 12 are inclined along the direction of drainage. Specifically, the surface of each of the plurality of convex portions 11 and the plurality of concave portions 12 (that is, the surface of the drainage structure portion 10) is inclined downward along the drainage direction. The surface of the drainage structure 10 is smoothly lowered as it goes in the drainage direction. For example, the bottom surface of the recess 12 (the valley line along the lowest point) is inclined along the drainage direction.

  Since the surface of the drainage structure section 10 is inclined, water attached to the surface flows down along the inclination. Thereby, the drainage structure 10 can drain along the drainage direction.

  In the present embodiment, the contour line of the surface is a straight line in the cross section (xz cross section) parallel to the drain direction of the drainage structure portion 10. As the inclination angle φ, which is an angle formed by the straight line and the horizontal plane (xy plane), is larger, the drainage can be improved. On the other hand, the water repellent surface material 1 is used as a surface material of the floor 91 as shown in FIG. In this case, it is assumed that a person stands on the water-repellent surface material 1. For this reason, in order to reduce the uncomfortable feeling due to the floor being inclined when a person stands, the inclination angle φ is, for example, 1.2 degrees or less.

  FIG. 4 is a cross-sectional view showing a partial cross section of the drainage structure 10 of the water repellent surface material 1 according to the present embodiment. Specifically, FIG. 4 shows a yz section including four convex portions 11 and five concave portions 12. The yz cross section is a cross section orthogonal to the drainage direction.

  In the yz section, the apex angle θ of the convex portion 11 is 160 degrees or less. The apex angle θ is an angle formed by two virtual straight lines L1 and L2 connecting the vertex P of the convex portion 11 and the lowest points Q1 and Q2 of the two concave portions 12 adjacent to the convex portion 11. In the present embodiment, since the slope of the convex portion 11 is a flat surface, the imaginary straight lines L1 and L2 coincide with the contour line of the convex portion 11 in the yz section. Therefore, the apex angle θ is an angle formed by the contour line (that is, the surface) of the convex portion 11 at the apex P of the convex portion 11 as shown in FIG.

  In the present embodiment, the cross-sectional shape of the convex portion 11 is an isosceles triangle. Accordingly, the angles formed by the contour line (surface) of the convex portion 11 connecting the vertex P and the lowest point Q1 or Q2 are each 10 degrees (= (180−160) / 2) or more. That is, the slope of the convex portion 11 is inclined at an angle of 10 degrees or more.

  As shown in FIG. 4, the height h of the convex part 11, ie, the height from the lowest point Q1 (or Q2) of the vertex P is 5 mm or less. The distance d between adjacent vertices P is 8 mm or more and 20 mm or less.

  The drainage structure 10 is formed from, for example, a thermoplastic resin or a thermosetting resin. Specifically, the drainage structure 10 is made of fiber reinforced plastic (FRP) or SMC (Sheet Molding Compound) material containing glass fiber. Or the drainage structure part 10 may be formed from the artificial marble which contains an acrylic or polyester as a main component. The drainage structure 10 is formed by press molding using an SMC material, for example.

[Production method]
Then, the manufacturing method of the water repellent surface material 1 which concerns on this Embodiment is demonstrated.

  FIG. 5 is a cross-sectional process diagram illustrating a method of manufacturing the water repellent surface material 1 according to the present embodiment. The water-repellent surface material 1 according to the present embodiment is formed by press molding using the molds 20 and 23. The mold 20 is provided with concave portions 21 and convex portions 22 corresponding to the convex portions 11 and the concave portions 12 of the water repellent surface material 1, respectively. That is, the mold 20 is provided with a concavo-convex structure having a shape in which the drainage structure portion 10 (concavo-convex structure) of the water repellent surface material 1 is inverted.

  First, as shown in FIG. 5A, the material 24 is placed on the mold 23. The material 24 is a thermoplastic resin or a thermosetting resin, for example, an SMC material. The molds 20 and 23 are heated and kept constant at a predetermined temperature.

  Next, as shown in FIG. 5B, the mold 20 and the mold 23 are combined and pressed at a constant pressure and a constant temperature for a predetermined period. The pressure, temperature, and period during pressing are not particularly limited, but are the pressure, temperature, and period that can sufficiently deform the material 24.

  Next, the deformed material 24 is taken out from the molds 20 and 23, cooled, and deburred to form the water-repellent surface material 1 as shown in FIG. 5C. The water-repellent surface material 1 is transferred with a concavo-convex structure provided on the mold 20 to form a drainage structure portion 10 (convex portion 11 and concave portion 12).

  In the present embodiment, the water-repellent surface material 1 is manufactured by press molding, but is not limited thereto. The water repellent surface material 1 may be manufactured by injection molding or the like.

[Effects, etc.]
As described above, the water-repellent surface material 1 according to the present embodiment includes the drainage structure portion 10 having a surface water contact angle of 90 degrees or more, and the drainage structure portion 10 includes a plurality of convex portions arranged alternately. 11 and a plurality of recesses 12, each of the plurality of protrusions 11 and the plurality of recesses 12 extends in a line shape along the drainage direction and is inclined along the drainage direction, and is orthogonal to the drainage direction. (A) an angle (vertical angle) formed by two virtual straight lines L1 and L2 connecting the vertex P of the convex portion 11 and the lowest points Q1 and Q2 of each of the two concave portions 12 adjacent to the convex portion 11. θ) is 160 degrees or less, (b) the height h of the vertex P from the lowest point Q1 (or Q2) is 5 mm or less, and (c) the distance d between adjacent vertices P is 8 mm. It is 20 mm or less.

  Thereby, since the surface of the drainage structure part 10 is inclined along the drainage direction, for example, most of the water that has been sprinkled on the floor in a shower or the like flows down in the drainage direction due to the inclination of the drainage structure part 10 (that is, Drained). At this time, since the surface of the drainage structure 10 has water repellency, the amount of water remaining on the surface without being drained is small, and even if it remains, the contact area between the droplet and the surface is small. For this reason, the adhesion of scale can be reduced, and the growth of mold and the like can be suppressed, so that the antifouling property of the water repellent surface material 1 is enhanced. Moreover, since the convex part 11 and the recessed part 12 are extended in a line shape, in the case of cleaning, dirt can be easily scraped off with a sponge etc. along the said line, and the cleanability of the water-repellent surface material 1 is improved. .

  At this time, minute droplets that do not flow down when the surface of the drainage structure 10 is inclined remain on the surface. In the present embodiment, since the convex portions 11 and the concave portions 12 that are alternately repeated are provided, the remaining liquid droplets remaining on the surface can be rolled down into the concave portions 12. Residual droplets that have fallen into the recesses 12 gather together with other residual droplets that have fallen into a large droplet. By increasing the size of the residual droplets, it becomes easier to flow due to the inclination of the surface of the drainage structure 10. Thus, according to the present embodiment, the remaining droplets can be collected in the recess 12 and drained.

  Here, as a result of studies by the inventors, it has been found that when water repellency is realized by a fine concavo-convex structure, the drop angle of a general droplet is about 10 degrees. In addition, a general droplet is a droplet of about 40 μL assumed to evaporate within 6 hours, for example.

  Here, the falling angle is the minimum value of the inclination angle at which the droplets remaining on the slope roll along the slope. In the water-repellent surface material 1 according to the present embodiment, since the apex angle is 160 degrees or less, the falling angle can be set to 10 degrees or more, and the remaining liquid droplets remaining on the convex portion 11 are allowed to fall into the concave portion 12. It can be made easier. Since residual droplets causing factors such as scale and mold can be reduced, the antifouling property of the water-repellent surface material 1 is improved.

  Further, the distance d between the apexes P is 8 mm or more, which is twice or more of 4 mm, which is a general droplet size. For this reason, two or more residual liquid droplets remaining in the convex portion 11 can be collected in the concave portion 12. For example, two or more residual liquid droplets remaining in the adjacent portions of each of the two adjacent convex portions 11 can be collected in the concave portion 12 between the two convex portions 11. Since the two or more collected residual droplets gather together in the recess 12 and become large, they easily flow along the direction of drainage. The droplet size indicates the size of the droplet on the floor surface when a predetermined amount (for example, 40 μL) of water droplets is dropped on the floor surface. (Maximum width).

  Further, since the distance d between the vertices P is 20 mm or less, the unevenness can be seen naturally. That is, the water repellent surface material 1 can improve the design.

  Moreover, since the height h of the vertex P is 5 mm or less, when a person steps on the convex portion 11 with his / her foot, the pain can be relieved (or not felt). Thereby, the water-repellent surface material 1 can be used also for parts that become a scaffolding for people such as the floor 91 of the bathroom 90. In this case, the drainage structure portion 10 having irregularities also functions as a slip stopper.

  As described above, the water-repellent surface material 1 according to the present embodiment is excellent in drainage and antifouling properties. Furthermore, the water-repellent surface material 1 is excellent in design and versatility of usage.

  For example, in the yz cross section, the contour line of the convex portion 11 coincides with the two virtual straight lines L1 and L2.

  Thereby, since the uneven | corrugated cross-sectional shape becomes a triangle, since the intensity | strength of the convex part 11 can be raised, high drainage property and antifouling property can be maintained over a long period of time.

  Further, for example, the plurality of convex portions 11 and the plurality of concave portions 12 are provided in a stripe shape in a top view.

  Thereby, since the drainage direction of the drainage structure part 10 is aligned in one direction, dirt can be easily scraped off with a sponge or the like along the direction at the time of cleaning. That is, the cleaning property can be further improved and the antifouling property can be further improved. Moreover, since the unevenness is striped, it is excellent in design.

[Modification 1]
Below, the modification 1 of Embodiment 1 is demonstrated.

  FIG. 6 is a cross-sectional view showing a partial cross section of the drainage structure 30 of the water repellent surface material according to this modification. As shown in FIG. 6, the drainage structure portion 30 according to this modification includes a convex portion 31 and a concave portion 32 that are different in shape from the convex portion 11 and the concave portion 12 according to the first embodiment. The cross section shown in FIG. 6 corresponds to the cross section shown in FIG. 4 and is a cross section orthogonal to the direction of drainage of the drainage structure 30. Below, it demonstrates centering around difference with Embodiment 1, and description about a common point may be abbreviate | omitted or simplified.

  In the cross section (yz cross section) shown in FIG. 6, the outline of the drainage structure portion 30 connecting the apex P and the lowest points Q1 and Q2 includes a curved portion 33 that protrudes downward. The outline of the drainage structure part 30 in the yz section corresponds to the inclined surface (that is, the surface) of the convex part 31 (or the concave part 32).

  As shown in FIG. 6, the entire contour line from the vertex P to the lowest point Q <b> 1 is a curved portion 33. Similarly, the entire contour line from the vertex P to the lowest point Q2 is the curved portion 33. That is, in the yz cross section, the outline of the drainage structure portion 30 does not have a straight portion. Note that the outline of the drainage structure section 30 may have, for example, a straight line portion (specifically, see FIG. 4) that is bent at the apex P or the lowest point Q1 or Q2 in the yz section.

  Although the curved part 33 is a circular arc, it is not limited to this. For example, the curved portion 33 may be an elliptical arc or a parabola.

  In the present modification, the conditions satisfied by the dimensions of the drainage structure section 30 are the same as those of the drainage structure section 10 according to the first embodiment. Specifically, the height h of the convex portion 31 is 5 mm or less. The distance d between adjacent vertices P is 8 mm or more and 20 mm or less.

  Further, the apex angle θ of the convex portion 31 is 160 degrees or less. As shown in FIG. 6, the apex angle θ is an angle formed by virtual lines L1 and L2 with the vertex P as the center. In this modified example, since the inclined surface of the convex portion 31 is a curved surface, the virtual straight lines L1 and L2 and the contour line of the convex portion 31 do not match. Since the contour line of the convex portion 31 includes the convex curve portion 33 below, the actual angle at the vertex P (the angle formed by the contour line) is smaller than the apex angle θ.

  As described above, in the water-repellent surface material according to the present modification, the contour line of the drainage structure portion 30 that connects the vertex P and the lowest point Q1 or Q2 in the yz cross section includes the curved portion 33 that protrudes downward. At this time, for example, the curved portion 33 is an arc.

  As a result, the inclination in the vicinity of the apex P of the convex portion 31 becomes steep, so that it is easy to cause the droplet to fall into the concave portion 32. Specifically, a droplet having a smaller size can be tumbled into the recess 32 to be collected with other droplets, and can flow along the direction of drainage. Thus, according to the water-repellent surface material according to the present modification, the drainage can be further enhanced, and thereby the antifouling property can be further enhanced.

[Modification 2]
Below, the modification 2 of Embodiment 1 is demonstrated.

  FIG. 7 is a cross-sectional view showing a partial cross section of the drainage structure 40 of the water repellent surface material according to the present modification. As shown in FIG. 7, the drainage structure portion 40 according to the present modification includes a convex portion 41 and a concave portion 42 that are different in shape from the convex portion 11 and the concave portion 12 according to the first embodiment. The cross section shown in FIG. 7 corresponds to the cross section shown in FIG. 4, and is a cross section orthogonal to the drainage direction of the drainage structure portion 40. Below, it demonstrates centering around difference with Embodiment 1, and description about a common point may be abbreviate | omitted or simplified.

  In the cross section (yz cross section) shown in FIG. 7, the contour line of the convex portion 41 includes two straight portions 43 and an arc portion 44.

  The two straight line portions 43 correspond to a part of the two sides of the convex portion 11 whose cross-sectional shape shown in FIG. The end of the straight line portion 43 is the lowest point Q1 (or Q2) of the recess 42. That is, the lowest point Q1 (or Q2) of the concave portion 42 is located at the connection point of the linear portions 43 of the adjacent convex portions 41. The straight line portion 43 has a gradient equal to or greater than the falling angle (10 degrees) of a droplet having a general size.

  The arc portion 44 is a part of a circle C having a center (center point O) in a direction directly below the vertex P. That is, the vertex P of the convex portion 41 is located at the approximate center of the arc portion 44. The circle C is in contact with the two straight portions 43. As shown in FIG. 7, the distance D between the ends of the arc portion 44 is 4 mm or less. The end of the arc portion 44 is a contact point between the circle C and the straight portion 43. The size of the circle C is not particularly limited, and the center point O may be located below the lowest point Q1 (or Q2), and may be the same height as the lowest point Q1 (or Q2) or higher. May be located. For example, the distance D between the end portions of the arc portion 44 is not more than ½ of the distance d between the vertices P.

  In the present modification, the conditions satisfied by the dimensions of the drainage structure section 40 are the same as those of the drainage structure section 10 according to the first embodiment. Specifically, the height h of the convex portion 41 is 5 mm or less. The distance d between adjacent vertices P is 8 mm or more and 20 mm or less.

  Moreover, the apex angle θ of the convex portion 41 is 160 degrees or less. As shown in FIG. 7, the apex angle θ is an angle formed by virtual lines L1 and L2 with the vertex P as the center. In this modification, since the top of the convex portion 41 is rounded, the virtual straight lines L1 and L2 do not match the contour line of the convex portion 41. Specifically, since the contour line of the convex portion 41 includes the arc portion 44, the actual angle at the vertex P (the angle formed by the contour line) is larger than the apex angle θ. That is, the inclination of the arc portion 44 is gentler than that of the straight portion 43.

  Therefore, when the arc portion 44 is too large, the droplets attached to the arc portion 44 are less likely to fall into the recess 42. Therefore, in this modification, the distance D between both ends of the arc portion 44 is 4 mm or less. For this reason, even when the droplet adheres to the arc portion 44, at least a part of the droplet is in contact with the straight portion 43 having a steep inclination, so that the droplet rolls along the straight portion 43. It becomes easy.

  As described above, in the water-repellent surface material according to this modification, in the yz section, (d) the contour line of the convex portion 41 is the arc portion 44 that is a part of the circle C having the center O immediately below the vertex P. (E) The distance D between both ends of the arc portion 44 is 4 mm or less.

  Thereby, since the top part of the convex part 41 is roundish, for example, when a person steps on the convex part 41 with a foot, pain can be relieved (or not made to feel). Further, since the vertex P of the convex portion 41 is not sharp, the strength in the vicinity of the vertex P increases. Therefore, for example, it is possible to suppress the protrusion 41 from being broken when it is rubbed with a sponge or the like during cleaning.

  Further, in this modification, the distance D between the end portions of the arc portion 44 is 4 mm or less, which is a general droplet size, so that the droplets adhering to the arc portion 44 are likely to fall into the recess 42. Thereby, the dropped liquid droplets gather and flow easily in the direction of drainage, so that drainage can be improved.

[Modification 3]
Below, the modification 3 of Embodiment 1 is demonstrated.

  FIG. 8 is a cross-sectional view showing a partial cross section of the drainage structure 50 of the water repellent surface material according to the present modification. As shown in FIG. 8, the drainage structure unit 50 according to this modification includes a convex part 51 and a concave part 52 that are different in shape from the convex part 11 and the concave part 12 according to the first embodiment. The cross section shown in FIG. 8 corresponds to the cross section shown in FIG. 4, and is a cross section orthogonal to the drainage direction of the drainage structure portion 50. Below, it demonstrates centering around difference with Embodiment 1, and description about a common point may be abbreviate | omitted or simplified.

  In the cross section shown in FIG. 8 (yz cross section), the contour line of the convex portion 51 includes two curved portions 53 and an arc portion 54.

  The two curved parts 53 are a part of the curved part 33 of the convex part 31 of the drainage structure part 30 which concerns on the modification 1 shown in FIG. Each of the two curved portions 53 is a curved portion that is convex downward. In addition, the lowest point Q1 (or Q2) of the recessed part 52 is located in the connection point of the curved part 53 of the adjacent convex part 51. FIG.

  The arc portion 54 is a part of a circle C having a center (center point O) in a direction directly below the vertex P. That is, the apex P of the convex portion 51 is located at the approximate center of the arc portion 54. The circle C is in contact with the two curves 53. As shown in FIG. 8, the distance D between the ends of the arc portion 54 is 4 mm or less. The end of the arc portion 54 is a contact point between the circle C and the curved portion 53. The distance D between the ends of the arc portion 54 is, for example, ½ or less of the distance d between the vertices P.

  In this modification, the conditions that the dimensions of the drainage structure section 50 satisfy are the same as those of the drainage structure section 10 according to the first embodiment. Specifically, the height h of the convex portion 51 is 5 mm or less. The distance d between adjacent vertices P is 8 mm or more and 20 mm or less.

  Moreover, the apex angle θ of the convex portion 51 is 160 degrees or less. As shown in FIG. 8, the apex angle θ is an angle formed by virtual lines L1 and L2 with the vertex P as the center. In the present modification, the top of the convex portion 51 is rounded and the inclined surface is curved, so the virtual straight lines L1 and L2 and the contour line of the convex portion 51 do not match. Specifically, since the contour line of the convex portion 51 includes the arc portion 54, the actual angle at the vertex P (the angle formed by the contour line) is larger than the apex angle θ. That is, the inclination in the arc portion 54 is gentler than that of the curved portion 53.

  Therefore, when the arc portion 54 is too large, the droplets attached to the arc portion 54 are difficult to fall into the recess 52. Therefore, in the present modification, the distance D between the ends of the arc portion 54 is 4 mm or less. For this reason, even when the droplet adheres to the arc portion 54, at least a part of the droplet is in contact with the curved portion 53 having a steep inclination, so that the droplet rolls along the curved portion 53. It becomes easy.

  Thus, in the water-repellent surface material according to the present modification, in the yz section, (d) the contour line of the convex portion 51 is the arc portion 54 that is a part of the circle C having the center O immediately below the vertex P. (E) The distance D between both ends of the circular arc portion 54 is 4 mm or less. Specifically, the drainage structure unit 50 according to the present modification has a structure in which the first modification and the second modification of the first embodiment are combined.

  Thereby, similarly to the modified examples 1 and 2, for example, when a person steps on the convex portion 51 with his / her foot, the pain can be relieved (or not felt). Further, for example, it is possible to prevent the convex portion 51 from being broken when it is rubbed with a sponge or the like during cleaning. Moreover, drainage can be improved.

(Embodiment 2)
[Constitution]
Next, the configuration of the water repellent surface material 101 according to Embodiment 2 will be described with reference to FIG. FIG. 9 is a top view of the water-repellent surface material 101 according to the present embodiment. The water repellent surface material 101 according to the present embodiment is applied to the floor 91 of the bathroom 90 shown in FIG. 1, for example, similarly to the water repellent surface material 1 according to the first embodiment. Below, it demonstrates centering around difference with Embodiment 1, and description about a common point may be abbreviate | omitted or simplified.

  As shown in FIG. 9, the water repellent surface material 101 includes a drainage structure 110. The drainage structure part 110 has a water contact angle of 90 ° or more on the surface, and has water repellency. The drainage structure 110 has a plurality of drainage directions radially about the drainage port 92. In FIG. 9, a plurality of white arrows indicate the direction of drainage of the drainage structure 110.

  The drainage structure 110 includes a plurality of convex portions 111 and a plurality of concave portions 112 that are alternately arranged. In FIG. 9, the vertex P of the convex portion 111 is indicated by a solid line, and the lowest point Q1 (or Q2) of the concave portion 112 is indicated by a broken line.

  The drainage structure 110 is configured such that all drainage directions point to the drainage port 92 when viewed from above. Specifically, the plurality of convex portions 111 and the plurality of concave portions 112 of the drainage structure portion 110 are provided radially when viewed from above. For this reason, the some convex part 111 is provided so that between the adjacent vertexes P may approach along a drainage direction. Similarly, the plurality of recesses 112 are provided so as to approach the lowest points Q1 and Q2 adjacent to each other along the direction of drainage. In addition, the shape in the cross section orthogonal to the radial direction of the convex part 111 and the recessed part 112 is the same as any one of Embodiment 1 and its modifications 1-3, for example.

FIG. 10A is an enlarged top view showing a part of the drainage structure 110 of the water repellent surface material 101 according to the present embodiment. Specifically, FIG. 10A shows the region X of FIG. 9 in an enlarged manner. The region X includes a portion where the distance d between the vertices P of the two adjacent convex portions 111 is a predetermined threshold value _dth .

In the present embodiment, the height h from the lowest point Q1 (or Q2) of the apex P of the convex portion 111 gradually decreases along the drainage direction, and the distance d between the apexes P becomes the threshold value d _th . It becomes 0 at the point. Specifically, one of the two convex portions 111 disappears at a point where the distance d becomes the threshold value d _th . The threshold value d _th is a value of 8 mm or more and 10 mm or less, for example.

FIG. 10A shows three convex portions 111a to 111c. When attention is paid to the convex portion 111b, the distance d between the vertices of the convex portion 111b and the convex portion 111a gradually decreases along the direction of drainage (the white arrow in the figure). The distance d is defined as a distance in a direction orthogonal to the direction in which the concave portion 112a extends between the convex portions 111a and 111b (specifically, a broken line representing the lowest point of the concave portion 112a in FIG. 10A). be able to. The convex portion 111b disappears at the point where the distance d becomes the threshold value _dth .

  FIG. 10B is a cross-sectional view showing a cross section parallel to the drain direction of the drain structure 110 of the water repellent surface material 101 according to the present embodiment. Specifically, FIG. 10B shows a cross section that passes through the apex of the convex portion 111b and is cut along the direction in which the convex portion 111b extends (the drainage direction of the convex portion 111b).

  As shown in FIG. 10B, the height 111 of the protrusion 111b decreases along the direction of drainage. The height h is a distance from the lowest point Q1 (or Q2) of the recess 112a (or 112b). The recess 112a (and 112b) is inclined at an inclination angle φ.

At the point where the distance d reaches the threshold value d _th , the convex portion 111b disappears and becomes concave portions 112a and 112b. Specifically, after the convex portion 111b disappears, the concave portions 112a and 112b become one wide concave portion.

As the convex portion 111b disappears, the distance d between the vertices becomes the distance between the vertex of the convex portion 111a and the vertex of the convex portion 111c. The distance d in this case can be defined as a distance in a direction orthogonal to the extension line of the apex of the disappeared convex portion 111b (that is, the direction in which the convex portion 111b extends). The distance d between the vertices after the protrusion 111b disappears is approximately doubled. For this reason, for example, the threshold value d _th is a value of 10 mm or less so that the distance d between vertices immediately after disappearance does not become too large.

  As shown in FIG. 9, in the drainage structure unit 110, all the projections 111 eventually disappear while reducing the number of projections 111 toward the radiation point (drainage port 92).

[Effects, etc.]
As described above, in the water-repellent surface material 101 according to the present embodiment, the plurality of convex portions 111 are provided so that the vertices P approach each other along the drainage direction, and the lowest point Q1 (or Q2) of the vertices P The height h from) gradually decreases along the direction of drainage, and becomes 0 at a point where the distance d between the apexes P reaches a predetermined threshold value _dth .

  Thereby, it is possible to prevent the adjacent convex portions 111 from coming too close to each other, so that the drainage can be maintained. Similarly to the first embodiment, the plurality of convex portions 111 are appropriately arranged in the plane so that the distance d between the vertices is within the range of 8 mm or more and 20 mm or less. Can increase the sex.

  Further, for example, the plurality of convex portions 111 and the plurality of concave portions 112 are provided radially when viewed from above.

  Thereby, for example, by providing the drain outlet 92 at the radiation point, drainage can be performed efficiently. Moreover, since the several convex part 111 and the several recessed part 112 of the drainage structure part 110 are radial in top view, it is excellent also in design property.

[Modification]
Here, a modification of the second embodiment will be described.

FIG. 11A is an enlarged perspective view showing a part of the drainage structure 120 of the water repellent surface material according to the present modification. Specifically, FIG. 11A includes a portion where the distance d between the apexes P of two adjacent convex portions 121 is a predetermined threshold value _dth .

  FIG. 11B is a cross-sectional view showing a cross section parallel to the drain direction of the drainage structure portion of the water repellent surface material according to the present modification. Specifically, FIG. 11B shows a cross section that passes through the apex of the convex portion 121b shown in FIG. 11A and is cut along the direction in which the convex portion 121b extends (the drainage direction of the convex portion 121b).

  In this modification, the water-repellent surface material 101 according to Embodiment 2 includes a drainage structure 120 shown in FIGS. 11A and 11B instead of the drainage structure 110.

  The drainage structure 120 has a plurality of convex portions 121 and a plurality of concave portions 122 that are alternately arranged. Similarly to FIGS. 9 and 10A, in FIG. 11A, the vertex P of the convex portion 121 is represented by a solid line, and the lowest point Q1 (or Q2) of the concave portion 122 is represented by a broken line.

In this modification, as shown in FIG. 11B, the height h from the lowest point Q1 (or Q2) of the vertex P of the convex portion 121 is until the distance d between the vertices P reaches a predetermined threshold value d _th . It is substantially constant and gradually decreases along the drain direction from the point E at which the threshold value _dth is reached. Specifically, the height h of one of the two convex portions 121 gradually decreases from the point E where the threshold value d _th is reached.

FIG. 11A shows three convex portions 121a to 121c. When focusing on the convex portion 121b, the distance d ₁ between the vertex P of the convex portion 121b and the convex portion 121a is drained along the (white arrows in the drawing) becomes gradually smaller. Similarly, the distance d ₂ between the vertices P between the convex portions 121b and the convex portion 121c is also gradually becomes smaller along the drainage direction. In the present modification, as shown in FIG. 11A, the convex portion 121a and the convex portion 121c are in a line-symmetric relationship with respect to the ridge line along the apex P of the convex portion 121b in the top view. For this reason, when it follows along the drainage direction, the distances d ₁ and d ₂ at the same point E both become the threshold value d _th .

As shown in FIG. 11B, the height 121 of the convex portion 121b gradually decreases from the point E along the direction of drainage. For example, in a distance _{d 3} between the apex P of the convex portion 121a and the convex portion 121c is the threshold _{d th,} the convex portion 121b at a height h is 0 such inclination, the height h is gradually decreased .

As shown in FIG. 11A, the convex portion 121b has a narrower width (distance between the lowest points of adjacent concave portions 122 (distance between broken lines in the figure)) in the drain direction in a top view. . Specifically, the top view shape of the convex portion 121b from the point E to the point G is an isosceles triangle that tapers from the point E to the point G. Here, the point G is a point where the height h of the convex portion 121b becomes zero. Point G, for example, are located in a range where the distance _{d 3} between the apex P of the convex portion 121a and the convex portion 121c is equal to or greater than the threshold value _{d th.}

  In this modification, the height h of the convex portion 121b is substantially constant up to the point E along the drainage direction. The heights h of the other protrusions 121a and 121c are also substantially constant along the direction of drainage.

On the other hand, each apex angle θ of the convex portions 121a to 121c changes along the direction of drainage. For example, the apex angle θb of the convex portion 121b gradually decreases to the point E along the direction of drainage, and becomes substantially constant or gradually increases after the point E. The apex angle θa of the convex portion 121a gradually decreases to the point F along the direction of drainage, and gradually increases after passing the point F. The point F is a point where the distance d ₁ between the apexes P becomes the threshold value d _th . The same applies to the apex angle θc of the convex portion 121c. The apex angle θ of each convex portion is, for example, 160 degrees or less in a cross section at any point in the drainage direction.

Thus, in the water-repellent surface material according to the present modification, the plurality of convex portions 121 are provided so that the vertices P approach each other along the drainage direction, and from the lowest point Q1 (or Q2) of the vertices P. The height h is substantially constant until the distance d between the vertices P reaches a predetermined threshold value d _th , and gradually decreases along the drainage direction from the point where the threshold value d _th is reached.

  Thereby, it is possible to prevent the adjacent convex portions 121 from coming too close to each other, so that the drainage can be maintained. Similarly to the first embodiment, the plurality of convex portions 121 are appropriately arranged in the plane so that the distance d between the vertices is within the range of 8 mm or more and 20 mm or less. Can increase the sex.

(Embodiment 3)
[Constitution]
Next, the configuration of the water repellent surface material according to Embodiment 3 will be described with reference to FIG. FIG. 12 is an enlarged perspective view showing a part of the drainage structure 210 of the water repellent surface material according to the present embodiment. The top view shape of the water repellent surface material according to the present embodiment is, for example, the same as that of the water repellent surface material 1 shown in FIG. FIG. 12 is an enlarged view corresponding to the region III of FIG. 2 as in FIG.

  As shown in FIG. 12, the drainage structure unit 210 according to the present embodiment includes a plurality of convex portions 211 and a plurality of concave portions 212. The plurality of convex portions 211 and the plurality of concave portions 212 are substantially the same as the plurality of convex portions 11 and the plurality of concave portions 12 according to Embodiment 1, respectively, and are different in that a fine concavo-convex structure 220 is provided on the surface. . Below, it demonstrates centering around difference with Embodiment 1, and description about a common point may be abbreviate | omitted or simplified.

  The surface of the fine concavo-convex structure 220 has a water contact angle of 90 degrees or more. Specifically, the surface of the fine concavo-convex structure 220 has a water contact angle of 120 degrees or more.

  In the present embodiment, the fine concavo-convex structure 220 has a line and space shape. Specifically, the fine concavo-convex structure 220 includes a plurality of line-shaped convex portions 221 and a plurality of line-shaped concave portions (grooves) 222, as shown in FIG.

  In the present embodiment, the top-view shape of each of the convex portion 221 and the concave portion 222 is a linear shape (band shape). The width of the convex portion 221 (line width in the short direction) is, for example, not less than 1 μm and not more than 20 μm. The height of the convex portion 221 is, for example, not less than 1 μm and not more than 40 μm. The width of the recess 222 (line width in the short direction) is, for example, not less than 2 μm and not more than 40 μm. The area ratio of the convex part 221 in the top view is, for example, 50% or less. In addition, the area ratio of the convex part 221 is represented by the area in the top view of the convex part 221 with respect to the area in the top view of the fine concavo-convex structure 220. The cross-sectional view shape (xz cross section) of the convex portion 221 is, for example, a substantially rectangular shape.

  Thereby, the fine concavo-convex structure 220 can support a droplet between two adjacent convex portions 221, and can prevent the droplet from coming into contact with the bottom surface of the concave portion 222. That is, since the contact area between the droplet and the surface of the fine concavo-convex structure 220 is reduced, the water slidability is improved. Since the droplet is supported between the two or more convex portions 221, it easily slips down in the direction in which the concave portion 222 extends along the two convex portions 221, that is, along the concave portion 222.

  The direction in which the convex part 221 extends is a direction orthogonal to the drainage direction of the drainage structure part 210. The direction in which the convex portion 221 extends and the direction in which the concave portion 222 extend are the same. That is, the direction in which the line-and-space-shaped line (or space) of the fine concavo-convex structure 220 extends is the direction from the apex of the convex portion 211 of the drainage structure portion 210 toward the lowest point of the concave portion 212. As a result, the fine concavo-convex structure 220 makes it easy for the liquid droplet to fall from the convex portion 211 to the concave portion 212. Therefore, the drainage structure unit 210 according to the present embodiment has extremely high drainage performance.

  In the present embodiment, the shape of the fine relief structure 220 is not limited to the example described above. For example, the shape and size of the plurality of convex portions 221 may be uniform or non-uniform in the plane. For example, the distance between the convex portions 221 (that is, the width of the concave portion 222) may be partially different in the plane. Moreover, the top view shape of the convex part 221 and the recessed part 222 may not be linear (strip | belt shape), wave shapes, such as a triangular wave and a sine wave, a broken line shape, or a curve shape may be sufficient. Further, the sectional shape of the convex portion 221 is not limited to a rectangle, and may be a triangle, a trapezoid, or a semicircle. Further, the corners of the convex portion 221 may be provided with rounds. A taper (spreading part) may be provided at the base of the convex part 221.

  The fine concavo-convex structure 220 can be formed using a material different from that of the drainage structure 210, for example. For example, the fine concavo-convex structure 220 is formed on the surface of a resin layer of a film (not shown) having a base material and a resin layer. For the resin layer, for example, a water-repellent resin such as a fluorine resin or a silicone resin can be used. The film thickness of the resin layer is, for example, 1 μm or more and 40 μm or less, but is not limited thereto.

  The fine concavo-convex structure 220 is formed by using a transfer technique using a nanoimprint apparatus or a roll-to-roll gravure printing apparatus. Further, the film having the fine concavo-convex structure 220 and the material 24 are combined and press-molded as shown in FIG. 5, so that the water-repellent structure 210 having the drainage structure portion 210 having the fine concavo-convex structure 220 formed on the surface is obtained. An aqueous surface material can be produced. The fine concavo-convex structure 220 may be formed by injection molding.

  Further, the surface of the fine concavo-convex structure 220 may be coated with fluorine. As the fluorine coating method, a dip method, a spray method, a vapor deposition method, or the like is appropriately selected according to the target film quality.

[Effects, etc.]
As described above, in the water-repellent surface material according to the present embodiment, the surface of the drainage structure 210 has the fine concavo-convex structure 220 having a water contact angle of 90 degrees or more. For example, the fine concavo-convex structure 220 has a line and space shape.

  Accordingly, the water repellency of the surface of the drainage structure 210 can be further enhanced by the fine concavo-convex structure 220. For example, the water contact angle of the surface can be increased to 120 degrees or more by the fine concavo-convex structure 220. Accordingly, the liquid droplets can be easily tumbled into the recesses 212, so that the drainage can be further improved.

  Or even if it is a case where the water contact angle of the material itself which comprises the drainage structure part 210 is low, water repellency can be improved by providing the fine uneven structure 220. FIG. Therefore, the selection range of the material used for manufacture of the drainage structure section 210 is widened, and a strong material, an inexpensive material, or the like can be appropriately selected according to demand. Thus, the freedom degree of material selection can be increased.

  In addition, for example, the direction in which the line-and-space-shaped line (convex portion 221) extends is orthogonal to the drainage direction.

  Accordingly, since it is possible to easily cause the liquid droplet to flow in the direction along the line of the fine concavo-convex structure 220, it is possible to easily cause the liquid droplet to fall into the concave portion 212. Therefore, drainage can be improved.

[Modification]
Below, the modification of Embodiment 3 is demonstrated.

  FIG. 13 is an enlarged perspective view showing a part of the drainage structure 210a of the water repellent surface material according to the present modification. In this modification, compared with Embodiment 3, the shape of the fine uneven structure 220a provided on the surface of the drainage structure 210a is different. Below, it demonstrates centering on difference with Embodiment 3, and the description about a common point is abbreviate | omitted or simplified.

  As shown in FIG. 13, the fine concavo-convex structure 220a has a plurality of convex portions 221a arranged in the plane. The shape of each of the plurality of convex portions 221a is, for example, a cylindrical shape, but may be a prismatic shape, and may be a cone or a pyramid shape. For example, the plurality of convex portions 221a are arranged at each vertex of the triangular lattice (that is, each vertex of a continuous regular triangle) in a top view, but the present invention is not limited thereto. The plurality of protrusions 221a may be arranged in a matrix or randomly.

  The diameter of the upper surface (and the bottom surface) of the convex portion 221a is, for example, 1 μm or more and 20 μm or less. The height of the convex portion 221a is, for example, not less than 1 μm and not more than 40 μm. The distance between the convex portions 221a is, for example, not less than 2 μm and not more than 40 μm. The area ratio of the convex part 221a in the top view is, for example, 50% or less. In addition, these dimensions are only an example, and similarly to the convex portion 221 according to Embodiment 3, a corner may be provided with a radius, or a taper may be provided at the base.

  Thereby, similarly to Embodiment 3, the fine concavo-convex structure 220a can support a droplet between two or more adjacent convex parts 221a, and can improve water slidability. Therefore, the drainage of the drainage structure part 210a having the fine uneven structure 220a can be enhanced.

(Other)
As mentioned above, although the water-repellent surface material which concerns on this invention was demonstrated based on said embodiment and its modification, this invention is not limited to said embodiment.

  For example, the recessed part 12 may have a flat part inclined along the direction of drainage. The width of the flat portion is, for example, 4 mm or less which is the size of the droplet. As a result, the liquid droplets that have fallen into the recess 12 can be collected together with other liquid droplets that have fallen in the same manner, and can flow along the direction of drainage.

  In addition, when the recessed part 12 has a plane part, the lowest point Q1 for drawing the virtual straight line L1 in the yz section is, for example, an end part of the plane part on the side close to the vertex P of the convex part 11 in the yz section. be able to. Or it is good also considering the center point of the plane part in yz cross section as the lowest point Q1.

  For example, in Embodiment 1 described above, an example in which the surface of the drainage structure portion 10 is entirely inclined at the inclination angle φ has been described, but the present invention is not limited thereto. For example, the top portion of the convex portion 11 (the mountain line along the apex P) may be horizontal without being inclined along the drainage direction, and only the edge portion of the convex portion 11 (specifically, the bottom of the concave portion 12). You may incline along the drainage direction.

  Further, for example, in the first embodiment described above, the example in which the inclination angle φ of the surface of the drainage structure portion 10 is 1.2 degrees or less is shown, but the inclination angle φ may be larger than 1.2 degrees. . For example, when the water-repellent surface material 1 is used for a structure that is unlikely to stand by a person, for example, the bottom of a bathtub 93, the person feels uncomfortable even when the inclination angle φ is greater than 1.2 degrees. No need. Therefore, drainage can be improved by making the inclination angle φ larger than 1.2 degrees.

  Further, for example, in the above-described second embodiment, the example in which the plurality of convex portions 111 and the plurality of concave portions 112 are provided radially in a top view is shown, but the present invention is not limited thereto. For example, the plurality of convex portions 111 may be arranged so as not to cross each other, and the distance d between the apexes may be increased along the drainage direction.

  In addition, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, and forms obtained by making various modifications conceived by those skilled in the art to each embodiment. Forms are also included in the present invention.

1, 101 Water-repellent surface material 10, 10a, 10b, 10c, 30, 40, 50, 110, 120, 210, 210a Drainage structure 11, 31, 41, 51, 111, 111a, 111b, 111c, 121, 121a 121b, 121c, 211 Convex part 12, 32, 42, 52, 112, 112a, 122, 212 Concave part 33, 53 Curved part 44, 54 Arc part 220, 220a Fine concavo-convex structure P Vertex Q1, Q2 Bottom point L1, L2 virtual straight line

Claims (11)

It has a drainage structure part whose surface water contact angle is 90 degrees or more,
The drainage structure portion has a plurality of convex portions and a plurality of concave portions arranged alternately,
Each of the plurality of convex portions and the plurality of concave portions extends in a line shape along the drainage direction, and is inclined along the drainage direction,
In the cross section perpendicular to the direction of drainage,
(A) The angle formed by two virtual lines connecting the vertex of the convex part and the lowest point of each of the two concave parts adjacent to the convex part is 160 degrees or less,
(B) The height of the vertex from the lowest point is 5 mm or less,
(C) The distance between adjacent apexes is 8 mm or more and 20 mm or less. The water repellent surface material according to claim 1, wherein in the cross section, a contour line of the drainage structure portion connecting the apex and the lowest point includes a downwardly convex curved portion. The water repellent surface material according to claim 2, wherein the curved portion is an arc. In the cross section,
(D) The contour line of the convex part includes an arc part which is a part of a circle having a center immediately below the vertex,
(E) The distance between both ends of the arc portion is 4 mm or less. The water repellent surface material according to any one of claims 1 to 3. The water repellent surface material according to claim 1, wherein in the cross section, a contour line of the convex portion coincides with the two virtual straight lines. The plurality of convex portions are provided so that the apexes approach each other along the drainage direction,
The height from the said lowest point of the said vertex becomes low gradually along the said drainage direction, and becomes 0 at the point where the distance between the said vertex became a predetermined threshold value. The water-repellent surface material as described in 1. The plurality of convex portions are provided so that the apexes approach each other along the drainage direction,
The height of the vertex from the lowest point is substantially constant until the distance between the vertices reaches a predetermined threshold, and gradually decreases along the drainage direction from the point at which the threshold is reached. The water repellent surface material according to any one of 1 to 5. The water repellent surface material according to any one of claims 1 to 7, wherein the plurality of convex portions and the plurality of concave portions are provided in a radial shape or a stripe shape in a top view. The water repellent surface material according to any one of claims 1 to 8, wherein a surface of the drainage structure portion has a fine uneven structure having a water contact angle of 90 degrees or more. The water repellent surface material according to claim 9, wherein the fine uneven structure has a line-and-space shape. The water repellent surface material according to claim 10, wherein a direction in which the line-and-space line extends is perpendicular to the drainage direction.

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