WO2018128092A1 - Corps moulé - Google Patents

Corps moulé Download PDF

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Publication number
WO2018128092A1
WO2018128092A1 PCT/JP2017/046076 JP2017046076W WO2018128092A1 WO 2018128092 A1 WO2018128092 A1 WO 2018128092A1 JP 2017046076 W JP2017046076 W JP 2017046076W WO 2018128092 A1 WO2018128092 A1 WO 2018128092A1
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WO
WIPO (PCT)
Prior art keywords
molded body
protrusions
recess
protrusion
cross
Prior art date
Application number
PCT/JP2017/046076
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English (en)
Japanese (ja)
Inventor
平井　千恵
文枝 堀端
大輝 梅本
梅田　章広
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017000325A external-priority patent/JP2018108696A/ja
Priority claimed from JP2017103678A external-priority patent/JP2018199224A/ja
Priority claimed from JP2017196511A external-priority patent/JP2019069546A/ja
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to CN201780075643.4A priority Critical patent/CN110049857A/zh
Publication of WO2018128092A1 publication Critical patent/WO2018128092A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing

Definitions

  • the present disclosure relates to a molded body having fluidity of liquid droplets and water repellency by a fine uneven structure provided on the surface of a substrate.
  • the water repellency is an index representing the non-adhesion property and the easy removal property of the droplets reaching the substrate surface on the substrate surface.
  • the water repellency is defined as higher as the contact angle between the substrate surface and the droplet is larger, and as the drop angle, which is the angle at which the droplet falls from the substrate, is smaller.
  • FIG. 1A is a diagram for explaining a contact angle
  • FIG. 1B is a diagram for explaining a falling angle.
  • the contact angle is an angle formed between the contact surface of the substrate surface 11 and the interface of the droplet 10 in a state where the droplet 10 is attached to the substrate surface 11 as shown in FIG. 1A.
  • the falling angle is an angle at which the substrate surface 11 on which the droplet 10 is placed is gradually inclined from a horizontal state and the droplet 10 starts to slide.
  • the macro interface between the droplet and the concavo-convex shape is composed of an interface between the droplet and the air on the concave portion and an interface between the droplet and the solid on the convex portion.
  • the size of the contact angle of the droplet is correlated with the ratio between the area of the interface between the droplet and the solid and the area of the interface between the droplet and the air in Cassie and Baxter theory. As the area ratio of the droplet / air interface increases, the contact angle also increases. This phenomenon can be inferred from the fact that air is a completely hydrophobic substance, and droplets floating in the air become spherical.
  • the wall-like protrusions can protect the protrusions that exhibit water repellency, and can improve wear resistance.
  • the water repellency cannot be sufficiently exhibited.
  • the present disclosure solves the above-described conventional problems and provides a molded body that realizes higher water repellency.
  • the molded body of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the surface of the base material, and the groove width between the plurality of protrusions is 1 ⁇ m above the bottom and is 2 ⁇ m or more.
  • the molded body is configured such that the angle formed by the plane passing through the bottom and the side surface of the protrusion is 90 degrees or less.
  • the molded body of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the uneven surface of the base material, and in the cross section perpendicular to the longitudinal direction of the array of the uneven surface,
  • the width is L
  • the depth of the recess is D
  • the width of the bottom of each cross section of the plurality of protrusions is M
  • the top of each cross section of each of the plurality of protrusions is 5 ⁇ m away from the top
  • a horizontal imaginary line is projected
  • the molded body of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the uneven surface of the base material, and in the cross section perpendicular to the longitudinal direction of the array of the uneven surface,
  • the width is L
  • the depth of the recess is D
  • the width of the bottom of the cross section of each of the plurality of protrusions is M
  • Each of the protrusions has a circular arc shape at the cross section, and when the radius of the arc is R, the molded body satisfies 1 ⁇ m ⁇ R ⁇ 3 ⁇ m.
  • the molded body of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the surface of the base material, and a plurality of adjacent ones in a cross section perpendicular to the longitudinal direction of the array of the plurality of protrusions.
  • the distance between the protrusions of the plurality of protrusions is w
  • the depth of the recess from the bottom to the top of the groove between the adjacent plurality of protrusions is D
  • a predetermined dimension from the bottom is D
  • L is the groove width at the upper position
  • the molded product has a groove width L of 14 ⁇ m ⁇ L ⁇ 90 ⁇ m, an aspect ratio D / w of 0.2 ⁇ D / w ⁇ 1.2, and a tip width T of 1 ⁇ m ⁇ T ⁇ 11 ⁇ m.
  • FIG. 1A is a diagram for explaining a contact angle.
  • FIG. 1B is a diagram for explaining the falling angle.
  • FIG. 2 is a diagram illustrating a cross-sectional configuration of the molded body according to the first embodiment of the present disclosure.
  • FIG. 3A is a schematic diagram illustrating an enlarged cross-sectional surface of an uneven surface of a molded body according to the first embodiment of the present disclosure.
  • FIG. 3B is a schematic diagram illustrating a cross-sectional enlargement of the uneven surface of the molded body according to the first embodiment of the present disclosure.
  • FIG. 3C is a schematic perspective view of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 4A is a schematic diagram illustrating a cross-sectional enlargement of the concavo-convex surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 4B is a schematic diagram illustrating a cross-sectional enlargement of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 4C is a schematic perspective view of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 5A is a schematic diagram illustrating an enlarged cross-sectional surface of a concavo-convex surface of a molded body according to the first embodiment of the present disclosure.
  • FIG. 5B is a schematic diagram illustrating a cross-sectional enlargement of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 5C is a schematic perspective view of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 6A is a schematic diagram illustrating an enlarged cross-sectional surface of a concavo-convex surface of a molded body according to the first embodiment of the present disclosure.
  • FIG. 6B is a schematic diagram illustrating an enlarged cross-section of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 6C is a schematic perspective view of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 7A is a schematic diagram illustrating an enlarged cross-section of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 7B is a schematic diagram illustrating a cross-sectional enlargement of the uneven surface of the molded body according to the first embodiment of the present disclosure.
  • FIG. 7C is a schematic perspective view of the uneven surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 8A is a schematic diagram illustrating an enlarged cross-sectional surface of a concavo-convex surface of a molded body according to the first embodiment of the present disclosure.
  • FIG. 8B is a schematic diagram illustrating a cross-sectional enlargement of the uneven surface of the molded body according to the first embodiment of the present disclosure.
  • FIG. 8C is a schematic perspective view of the uneven surface of the molded body according to the first embodiment of the present disclosure.
  • FIG. 8A is a schematic diagram illustrating an enlarged cross-sectional surface of a concavo-convex surface of a molded body according to the first embodiment of the present disclosure.
  • FIG. 8B is a schematic diagram illustrating a cross-
  • FIG. 9A is a schematic diagram showing a cross-sectional shape of the uneven surface of the molded body in Comparative Example 1.
  • FIG. 9B is a schematic diagram illustrating a cross-sectional shape of the uneven surface of the molded body in Comparative Example 1.
  • FIG. 9C is a schematic perspective view of the uneven surface of the molded body in Comparative Example 1.
  • FIG. 10 is a diagram showing the evaluation results on the wiping property and water repellency of the uneven surface located on the surface of the base material of the molded body of the present embodiment.
  • FIG. 11A is a diagram for describing a cross-sectional dimension of the molded body according to the second embodiment of the present disclosure, which is cut perpendicular to the uneven groove.
  • FIG. 11B is a diagram for describing a planar dimension of the concavo-convex shape of the molded body according to the second embodiment of the present disclosure.
  • FIG. 12A is a diagram for describing a cross-sectional dimension of the molded body according to the second embodiment of the present disclosure, which is cut perpendicular to the uneven groove.
  • FIG. 12B is a diagram for describing a cross-sectional dimension of the molded body according to the second embodiment of the present disclosure, which is cut perpendicular to the uneven groove.
  • FIG. 13A is a diagram illustrating a cross-sectional shape of a protruding portion with a sharp tip in the second embodiment of the present disclosure.
  • FIG. 13B is a diagram illustrating a cross-sectional shape of a protrusion with a flat tip in the second embodiment of the present disclosure.
  • FIG. 13C is a diagram illustrating a cross-sectional shape of a protrusion having an arcuate tip in the second embodiment of the present disclosure.
  • FIG. 14 is a diagram showing experimental results when the R dimension at the tip of the protrusion is smaller than 1 ⁇ m, as shown in FIG. 13A.
  • FIG. 15 is a diagram showing the experimental results when the tip width A of the protrusion is 3 ⁇ m as shown in FIG. 13B.
  • FIG. 16 is a diagram showing experimental results when the R dimension at the tip of the protrusion is 1 to 4 ⁇ m as shown in FIG. 13C.
  • FIG. 13C is a diagram illustrating a cross-sectional shape of a protrusion with a flat tip in the second embodiment of the present disclosure.
  • FIG. 13C is a diagram illustrating a cross-sectional shape of a pro
  • FIG. 17A is a diagram illustrating a cross-sectional configuration of a protrusion according to the third embodiment of the present disclosure.
  • FIG. 17B is a plan view of a protrusion in the third embodiment of the present disclosure.
  • FIG. 18A is a diagram illustrating a cross-sectional configuration of a protrusion according to the third embodiment of the present disclosure.
  • FIG. 18B is a diagram illustrating a cross-sectional configuration of the arc shape of the protrusion in the third embodiment of the present disclosure.
  • FIG. 19A is a diagram illustrating a cross-sectional configuration of a protrusion when a tip is pointed according to the third embodiment of the present disclosure.
  • FIG. 19A is a diagram illustrating a cross-sectional configuration of a protrusion when a tip is pointed according to the third embodiment of the present disclosure.
  • FIG. 19B is a diagram illustrating a cross-sectional configuration of the protrusion when the tip is flat according to the third embodiment of the present disclosure.
  • FIG. 19C is a diagram illustrating a cross-sectional configuration of the protrusion in the case where the tip end has an arc shape in the third embodiment of the present disclosure.
  • FIG. 20A is a diagram illustrating a cross-sectional configuration of the protrusion when the groove center is a curved surface according to the third embodiment of the present disclosure.
  • FIG. 20B is a diagram illustrating a cross-sectional configuration of the protrusion when the groove edge is a curved surface according to the third embodiment of the present disclosure.
  • FIG. 21 is a diagram showing experimental results when the projections and depressions have a concavo-convex shape as shown in FIGS. 19A, 19B, and 20A, and the tips of the protrusions are sharp.
  • FIG. 22 is a diagram showing an experimental result in the case where the uneven shape as shown in FIGS. 19C and 20B is used and the size of the radius R of the arc approximate to the shape of the apex of the protrusion is larger than 1 ⁇ m.
  • the molded body according to the first aspect of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the surface of the base material, and is between the plurality of protrusions and 1 ⁇ m above the bottom.
  • the groove width is 2 ⁇ m or more, and the angle formed by the plane passing through the bottom and the side surface of the projection is 90 degrees or less.
  • the angle formed by the plane passing through the bottom of the groove and the side surface of the protrusion is 90 degrees or less, it has a draft angle during molding and can be released from the groove bottom and the side surface of the protrusion.
  • the angle of the groove corner portion to be formed is widened, and dirt accumulated in the corner portion can be easily wiped off, and a concave shape easy to clean can be realized.
  • a concave portion is provided between the plurality of protrusions, the depth of the concave portion is D, and the groove width of the concave portion 1 ⁇ m above the bottom is L. In this case, the relationship of D / L ⁇ 10 is satisfied.
  • the wiping cloth used for wiping and cleaning can easily enter the groove, improving the wiping cleanability. it can.
  • the molded body according to the third aspect of the present disclosure is the molded body according to the second aspect.
  • the molded body according to the second aspect includes at least one of a flat surface and an arc-shaped portion on at least a part of the bottom of the recess between the plurality of protrusions. .
  • the bottom part has an edge part such as a triangular shape at the bottom part, when dirt enters the edge part, the wiping cloth does not easily penetrate into the edge part even during wiping cleaning, and dirt is difficult to wipe off.
  • the cloth can easily reach the back of the recess, and the wiping and cleaning properties are improved.
  • At least a part of the recesses between the plurality of protrusions has a groove shape extending in one direction.
  • the protrusion has a surface with a large number of columnar protrusions, such as a columnar or polygonal pyramid shape, the direction of the recesses between the irregularities will be lost during wiping and cleaning. It needs to be wiped off, and dirt tends to remain.
  • the bottom of the recess has a groove shape extending in one direction, the dirt can be scraped off by wiping in the groove direction of the recess, improving the cleanability and making it difficult for the dirt to remain.
  • the direction of the recess does not need to be one direction over the entire surface of the molded body, and if at least a part is one direction, the wiping property is improved. Further, it may meander somewhat.
  • each of the plurality of protrusions has a cross-sectional shape of at least a triangle, a quadrangle, and all or A shape having at least one of the circular arc shapes, a depth D of the recesses between the plurality of protrusions is 1 ⁇ m or more and 50 ⁇ m or less, and the protrusion width w is 2 ⁇ m or more. 0.3 ⁇ D / w ⁇ 2.
  • the molded product according to the sixth aspect of the present disclosure is the addition of one or more kinds selected from silicone, fluorine, and olefin in any of the first to fifth aspects Contains agents.
  • additives particularly silicone-based and olefin-based ones, it is possible to improve the fluidity of the resin. Thereby, the resin easily enters the convex portion of the molded body, and the uneven shape is easily transferred at the time of molding.
  • the molded body according to the seventh aspect of the present disclosure has a hardness measured by a durometer of 55 or more in any of the first to sixth aspects.
  • the molded body according to the eighth aspect of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the uneven surface of the base material, and a cross section perpendicular to the longitudinal direction of the array of the uneven surface.
  • the groove width of the recess is L
  • the depth of the recess is D
  • the width of the bottom of the cross section of each of the plurality of protrusions is M
  • 5 ⁇ m away from the top of the cross section of each of the plurality of protrusions and horizontal
  • the imaginary line has a tip width T cut off by the contour line of the protrusion section, 14 ⁇ m ⁇ M ⁇ 35 ⁇ m, 0.6 ⁇ D / L ⁇ 1.8, and 4 ⁇ m ⁇ T ⁇ 10 ⁇ m
  • the apex portion of the partial cross section has a curved shape.
  • the curved shape is an arc shape, and when the radius of the arc is R, 1 ⁇ m ⁇ R ⁇ 3 ⁇ m.
  • a molded body according to a tenth aspect of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the uneven surface of the base material, the cross section being perpendicular to the longitudinal direction of the array of the uneven surface ,
  • the groove width of the concave portion is L
  • the depth of the concave portion is D
  • the width of the bottom portion of each of the plurality of protrusions is M
  • the apex portion of the cross section of each of the plurality of protrusions has an arc shape, and when the radius of the arc is R, 1 ⁇ m ⁇ R ⁇ 3 ⁇ m.
  • the depth D of the recess is 12 ⁇ m ⁇ D ⁇ 35 ⁇ m in any aspect from the eighth aspect to the tenth aspect.
  • the height of the protrusion also affects the water repellency and wear resistance. That is, if the height is 12 ⁇ m or more, a large amount of air for high water repellency can be secured, while if the height is 35 ⁇ m or less, tip deformation due to wear and bending can be suppressed. According to this aspect, the wear deformation of the protrusion can be suppressed, and high water repellency can be expressed.
  • the contact angle with water on the surface of the plurality of protrusions of the molded body is 140 degrees or more and 150. Less than degrees.
  • the contact angle with water on the surface of the plurality of protrusions of the molded body is 150 degrees.
  • the molded body according to the fourteenth aspect of the present disclosure is a molded body including a base material and a plurality of protrusions arranged on the surface of the base material. And in the cross section perpendicular to the longitudinal direction of the array of the plurality of protrusions, the distance between the adjacent protrusions w, the depth of the recess from the bottom to the apex of the groove between the adjacent protrusions D, Let L be a predetermined dimension from the bottom, the groove width at the upper position is L, T be a predetermined dimension from the apexes of the plurality of protrusions, and T be the tip width at which the horizontal imaginary line at the lower position is cut off by the contour lines of the protrusions.
  • the groove width L is 14 ⁇ m ⁇ L ⁇ 90 ⁇ m
  • the aspect ratio D / w is 0.2 ⁇ D / w ⁇ 1.2
  • the tip width T is 1 ⁇ m ⁇ T ⁇ 11 ⁇ m.
  • wiping performance is improved by increasing the groove width within a certain range, and high water repellency is obtained by increasing the aspect ratio within a certain range and reducing the tip width within a certain range.
  • Can do is obtained by increasing the aspect ratio within a certain range and reducing the tip width within a certain range.
  • the molded body according to the fifteenth aspect of the present disclosure has a circular arc shape at each of the plurality of protrusions, and 0 ⁇ m ⁇ R ⁇ 6 ⁇ m when the radius of the circular arc is R.
  • the wiping property of the groove can be improved and higher water repellency can be obtained.
  • the molded body according to the sixteenth aspect of the present disclosure has a contact angle with the liquid on the surface of the plurality of protrusions of 120 degrees or more and less than 130 degrees.
  • the molded body of the seventeenth aspect of the present disclosure is the tip of the fourteenth aspect, wherein the groove width L is 30 ⁇ m ⁇ L ⁇ 55 ⁇ m, the aspect ratio D / w is 0.2 ⁇ D / w ⁇ 1.2, and the tip The width T is 1 ⁇ m ⁇ T ⁇ 8 ⁇ m.
  • the wiping property is improved, the aspect ratio is increased within a certain range, and the tip width is decreased within a certain range, thereby further increasing the water repellency.
  • the wiping property of the groove can be improved, and higher water repellency can be obtained.
  • the radius R of the arc is 0 ⁇ m ⁇ R ⁇ 4 ⁇ m.
  • the wiping property of the groove can be improved and higher water repellency can be obtained.
  • the contact angle with the liquid on the surface of the protrusion is 130 degrees or more and less than 140 degrees.
  • the molded body of the twentieth aspect of the present disclosure is the tip according to the fourteenth aspect, wherein the groove width L is 30 ⁇ m ⁇ L ⁇ 55 ⁇ m, the aspect ratio D / w is 0.2 ⁇ D / w ⁇ 1.2, and the tip The width T is 1 ⁇ m ⁇ T ⁇ 6 ⁇ m.
  • the radius R of the arc is 0 ⁇ m ⁇ R ⁇ 2 ⁇ m.
  • the molded body of the twenty-second aspect of the present disclosure is the molded body of the twentieth aspect or the twenty-first aspect, wherein the contact angle with the liquid on the surface of the plurality of protrusions is 140 degrees or more.
  • the recess depth D is 12 ⁇ m ⁇ D ⁇ 35 ⁇ m.
  • the protrusion height is above a certain level, so the air layer can be retained and water repellency can be ensured.
  • the protrusion height is below a certain value, ensuring physical wiping. Can be achieved.
  • the upper position from the bottom where the groove width L is measured is 1 ⁇ m.
  • the lower position from the apexes of the plurality of protrusions that measure the tip width T is 3 ⁇ m.
  • FIGS. 2 to 8C The molded body 1 according to the first embodiment will be described with reference to FIGS. 2 to 8C.
  • 2 is a diagram illustrating a cross-sectional configuration of the molded body 1 according to the first embodiment of the present disclosure
  • FIG. 3A, FIG. 3B, FIG. 4A, FIG. 4B, FIG. 5A, FIG. FIG. 7A, FIG. 7B, FIG. 8A, and FIG. 8B are schematic views each showing an enlarged cross-section of the concavo-convex surface of the molded body in the first embodiment of the present disclosure.
  • FIG. 3C, FIG. 4C, FIG. 5C, FIG. 6C, FIG. 7C, and FIG. 8C are schematic perspective views of the uneven surface of the molded body in the first embodiment of the present disclosure, respectively.
  • the molded body 1 has a base material, and an uneven surface 4 having a plurality of regularly arranged protrusions 2 and recesses 3 is formed on the surface of the base material. .
  • a component structure or a film used in a place where water repellency is required but is not limited thereto.
  • the material of the base material of the molded body 1 may be any material that can maintain the shape in a durable manner. Polyethylene, polypropylene, polystyrene, polycarbonate, polyethylene terephthalate, polymethyl meter acrylate, polyamide, vinyl chloride, polylactic acid, polyester , Polytetrafluoroethylene, and resins such as cyclic olefin, glass, and metals such as copper and stainless steel can be used. It is not particularly limited.
  • the material of the base material of the molded body 1 is freely selected in consideration of required appearance quality, transparency, mechanical properties, cost, and the like.
  • the base material of the molded body 1 may contain an inorganic or organic additive for imparting required mechanical properties, thermal properties, and water repellency.
  • additives include water repellents, slidability improvers, antioxidants, flame retardants, UV absorbers, light stabilizers, metal deactivators, lubricants, antistatic agents, antifogging agents, and nucleating agents.
  • An antibacterial agent, an antifungal agent, a foaming agent, a stabilizer, a plasticizer, a filler, a reinforcing material, a fiber, a pigment, and the like may be used, or a plurality of them may be contained. .
  • the uneven surface 4 and the base material may have an integral structure, but the material is selected according to the manufacturing method, the required water repellency, and the like. Another material may be sufficient as a base material, and another material may be combined.
  • the recess 3 has a groove width L in the vicinity of the bottom, and the bottom has a triangular shape, a flat shape, an arc shape, a polygonal shape, etc. in a sectional view. Or a combination thereof.
  • the shape of the bottom part of the recessed part 3 is not specifically limited, It is desirable from a viewpoint of wiping ease etc. to have flat shape or circular arc shape.
  • the groove width L of the recess 3 is defined as follows.
  • the bottom of the recess 3 is on substantially the same plane (including the same plane), that plane is taken as the bottom surface.
  • the cross-sectional shape of the bottom is inclined, when it is arcuate, or when it is rounded (when it includes an arc), a virtual plane passing through the bottom is defined as the bottom surface.
  • the above-described virtual plane does not necessarily pass through the bottom of all the recesses 3, and at least two recesses 3, that is, the recesses 3 and the recesses 3 adjacent to or located in the periphery of the recesses 3. Just go through the bottom.
  • the width L of the recess 3 is measured at a position 1 ⁇ m above the bottom surface.
  • the measurement of the groove width L at the upper portion of 1 ⁇ m from the bottom surface of the recess 3 is, for example, by observing the cross section of the molded body 1 or by observing the shape of the rough surface of the substrate by a laser microscope or the like. You may measure the approximate groove width in 1 micrometer upper part from a bottom face. Further, various factors related to the shape may be measured, and the result may be made into a drawing, and the groove width on the virtual surface 1 ⁇ m above the bottom surface may be calculated or calculated on the drawing.
  • the angle formed by the plane passing through the bottom and the side surface of the protrusion 2 is an angle indicated by a in FIGS. 3B, 4B, 5B, 6B, 7B, and 8B.
  • the angle a formed by the plane passing through the bottom and the side surface of the protrusion 2 is also obtained by the above-described method.
  • the depth of the recess 3 is indicated by D in each of FIGS. 3B, 4B, 5B, 6B, 7B and 8B.
  • the depth D of the concave portion 3 is defined as a distance between a plane passing through the bottom of the concave portion 3 on the concave / convex surface 4 and a virtual plane passing through the tip surface or the tip portion of the protrusion 2.
  • the virtual plane passing through the tip portion does not necessarily have to pass through the tip surfaces or the tip portions of all the projection portions 2, and is adjacent to or around at least one projection portion 2 and the projection portion 2. What is necessary is just to pass the front-end
  • the recess 3 is considered to improve performance if at least a part of the groove width L and depth D are evaluated and satisfy the prescribed values.
  • the ridge line of the protrusion 2 does not need to be a straight line, and can be freely designed in consideration of formability, and may be a curved line or a combined line of a straight line and a curved line. .
  • the protrusion 2 is formed such that the angle a formed by the plane passing through the bottom and the side surface of the protrusion 2 is 90 degrees or less, preferably 80 degrees or less.
  • the angle a of the protrusion 2 is 90 degrees or less, and further 80 degrees or less, it is possible to improve the detachability at the time of molding, the wiping property at the time of adhesion of the recess 3 and the like.
  • the angle a is an angle formed by a plane passing through the bottom and the side surface of the protrusion 2, and is an angle formed by a line obtained by viewing a virtual plane passing through the bottom from the cross-sectional direction and an outer shell line of the cross section of the protrusion 2. is there. If the side surface of the protruding portion 2 has a curved surface, the outer shell line of the cross section of the protruding portion 2 has a curved line.
  • the angle a of the protrusion 2 in this case is a tangent at at least one position of the curve, a tangent at a point where the side surface rises from the bottom, and a line obtained by viewing a virtual plane passing through the bottom from the cross-sectional direction.
  • the present invention is not limited to this.
  • the concave shape of the recess 3 is preferably approximately rectangular or linear, but may be wavy or indefinite.
  • the protrusion 2 has a cross-sectional shape selected from a rectangle, a square such as a square and a trapezoid, a triangle, a triangular trapezoidal cone, and a polygon having a two-step inclination.
  • the protrusion 2 may have a rounded shape at least one of the tip and side surfaces of the shape described above.
  • the shape of the protrusion part 2 is not limited to these, A combination thereof may be sufficient,
  • the substantially trapezoidal cone whose front end surface is a flat surface inclined with respect to the base material, or the front end surface A cone having a rounded end may be used.
  • the shape which those shapes collapsed partially and became an indefinite shape is also contained.
  • the recess width w of the recess 3 is the closest to the protrusion 2 and the protrusion 2 as shown in FIGS. 3B, 4B, 5B, 6B, 7B, and 8B.
  • the distance between the adjacent protrusions 2 is defined.
  • the performance is improved if the recess width w of at least some of the recesses 3 is evaluated and satisfies a specified value.
  • the recess 3 may be a groove extending from one end of the molded body 1 to the opposite other end in a plan view, and the groove direction changes from one end of the molded body 1 to the other opposite end. May be. Moreover, the recessed part 3 may not have a straight line but the joint may arise. As long as at least a part of the recess 3 has a groove shape, the wiping cleanability can be improved.
  • the recesses 3 and the projections 2 may all be formed in the same shape, but it is not necessary to form all the recesses 3 and all the projections 2 in the same shape.
  • the recesses 3 and the protrusions 2 can be freely designed according to the shape of the area surface of the substrate surface where water repellency is required.
  • a mold having an intended inverted structure of the uneven shape is used on the surface of the base material. It is common to use a method of transferring the uneven shape. In such a method, after forming the protrusions 2, ease of separation (releasing properties) when separating the mold 1 and the molded body 1 that are in close contact (releasing properties) becomes an issue.
  • the mold release property can be maintained by setting the angle a between the groove bottom surface of the protrusion 2 and the side surface of the protrusion 2 to 90 degrees or less and defining the draft angle of the mold.
  • the uneven surface 4 does not need to be disposed over the entire surface of the base material of the molded body 1 and may be disposed in a limited area where water repellency is required.
  • the concave / convex surface 4 may be manufactured as a separate part from the molded body 1, but is preferably integrally molded from the viewpoint of durability. In the case of separate parts, it is desirable that the uneven surface 4 is adhered to the surface of the molded body 1 with good adhesion.
  • a transfer method is an example of a method for regularly arranging the uneven shape in a specified dimension.
  • Examples of the transfer method include injection molding, hot press molding, thermal imprint processing using nanoimprint technology, and optical imprint processing.
  • Injection molding is a process in which molten resin is poured into a mold (mold) container (core, cavity) with an uneven surface on the inner surface in advance to cool it, and the uneven surface on the mold surface is transferred to the resin. is there.
  • the hot press molding is to transfer the uneven shape on the mold surface to the resin by heating the mold and the resin and pressing the mold against the resin.
  • a mold having a cylindrical shape and transferring while rotating the cylinder is called embossing roll processing.
  • Thermal imprinting is a process in which a thermoplastic resin such as polymethylmethyl acrylate is applied to a substrate, the temperature is raised above the glass transition temperature, and the mold is pressed to transfer the shape.
  • a thermoplastic resin such as polymethylmethyl acrylate
  • Photo imprinting is a process in which a photocurable resin is applied to a substrate, a mold is pressed, and the resin is cured by UV irradiation to transfer the shape.
  • the thermal imprint process has a feature that the selectivity of the thermoplastic resin is wide, but there is a problem that the throughput does not increase because it takes time to raise and lower the temperature.
  • photoimprint processing has a problem with the selectivity of the photo-curing resin, generally it has a low viscosity, so it has good transferability, and it has a high throughput because it is cured by irradiation with ultraviolet rays. There is.
  • the mold can also be produced by machining such as diamond cutting and metal cutting, laser processing, etching, and special processing such as lithography.
  • the molded body 1 of the present embodiment is a molded body 1 having a plurality of protrusions 2 regularly arranged on the surface of the substrate, and is 1 ⁇ m above the bottom of the recess 3 between the protrusions 2.
  • the molded body 1 has a groove width L of 2 ⁇ m or more and an angle a formed by a plane passing through the bottom and the side surface of the protrusion 2 is 90 degrees or less.
  • the molded body 1 repels droplets due to a fine uneven structure, and the droplets are difficult to adhere, and it is recognized that the finer the uneven structure, the better the water repellency. .
  • the fiber diameter of the cloth is small and is about 1 to 2 ⁇ m. Assuming that the fiber diameter is 2 ⁇ m, if the groove width at the top of 1 ⁇ m from the bottom is 2 ⁇ m, the fiber can easily reach the bottom, and the dirt that has entered the recess 3 can be easily wiped off.
  • the ease of wiping may vary depending on the shape, variation, weaving method, material, cloth adhering to the uneven surface 4 and the like of the cloth used. Due to the effect of floating the deposits from the base material with water and detergent at the time of cleaning, pushing in the cloth by external force at the time of wiping, and deformation of the fiber, etc. is there.
  • the regularly arranged protrusions 2 need only be arranged so as to satisfy the above-described conditions, and the width L, the depth D, and the depression width w of all the recesses 3 need to be constant. Absent.
  • the molded body 1 has a concavo-convex shape on the surface, even when a droplet adheres to the surface, the droplet does not reach the bottom of the concave portion 3 and is metastable if each dimension of the concavo-convex shape is appropriate.
  • the air layer is held in the recess 3 to improve water repellency.
  • the area ratio, which will be described later, occupied by the protrusion 2 is 0.5 or less, and more preferably 0.3 or less.
  • the area ratio occupied by the protrusions 2 means that the protrusions 2 occupy the area of the entire region where the uneven surface 4 provided on the substrate surface is present on the plane passing through the apex of the protrusions 2. Refers to the area ratio.
  • the contact angle between the air and the droplet can be considered to be 180 degrees. For this reason, in the contact surface of a base material and a droplet, it becomes difficult to adhere to a base material, so that the area ratio which the projection part 2 occupies is low.
  • the area ratio occupied by the protrusions 2 is 0.5 or less, more preferably 0.3 or less, the adhesion between the substrate and the liquid droplets is sufficiently lowered, and high water repellency is exhibited.
  • Such a molded body 1 preferably has a drop angle of a droplet located on the substrate surface of 90 degrees or less.
  • the molded body 1 By using the molded body 1 on the surface of a product or member having a substantially vertical surface (including a vertical surface) or a smaller angle than the substantially vertical surface, the droplet attached to the surface is tumbled, Antifouling property and liquid cutting property can be improved.
  • the molded body 1 of the present disclosure when used inside a packaging material or a container, if the packaging material or the container is left standing or inclined, the filling material falls down and the liquid breakage improves. For this reason, there is an effect of facilitating use of the filling or keeping the spout hygienic.
  • the molded body 1 preferably has a contact angle of 120 degrees or more, more preferably 130 degrees or more, and further preferably 150 degrees or more with a droplet located on the substrate surface.
  • the molded body 1 may have the uneven surface 4 covered with an antifouling coating layer (not shown).
  • the coating agent used for the antifouling coating layer is applied to control the surface free energy of the uneven surface 4.
  • the material of the coating agent is not particularly limited, and a material selected from fluorine-based, silicone-based, polysilane-based, alkyl-based, acrylic-based and silica-based materials can be used.
  • the coating material has a functional group of the coating material component selected from a fluorocarbon group, a silicone group, a hydrocarbon group, and the like. Things can be used.
  • fluorine-based coating agent one containing a fluoroalkyl group or a fluoroether group can be used. Moreover, you may have a siloxane bond in order to improve a film
  • silicone-based coating agent one having polysiloxane as a skeleton and having at least one of a methyl group and a phenyl group in the side chain may be used, or a modifying group may be included.
  • polysilanes such as alkyl polysilanes and fluorinated alkyl polysilanes, alkyls, acrylics, silicas, and other general-purpose coating agents can be used.
  • a primer that forms, for example, a silica layer or an organic layer may be used in order to improve the adhesion to the substrate.
  • the substrate may be subjected to a discharge treatment such as a corona treatment or a plasma treatment.
  • the thickness of the coating layer is preferably 30% or less, more preferably 10% or less of the height of the protrusion 2. This is because if the film thickness of the coating agent is too large, the characteristics of the uneven structure of the substrate cannot be exhibited.
  • the antifouling coating layer if the performance of the molded body 1 is not impaired, inorganic fine particles such as silica can be adhered to the surface of the molded body 1 to be a part of the antifouling coating layer. is there. At this time, it is possible to use a binder component regardless of the inorganic binder and the organic binder.
  • the application of the coating agent can be selected from generally known methods such as dry and wet.
  • an additive capable of changing the surface free energy for example, an additive such as fluorine or silicone, is mixed in advance with the base material before molding, and after molding An antifouling coating layer may be formed on the surface.
  • the antifouling coating layer can be freely selected in accordance with the droplets that cause contamination, the required durability, the appearance, and the like.
  • a deviation of a dimension of ⁇ 20% or ⁇ 1 ⁇ m is allowed as an error range using a shape measuring laser microscope or a scanning electron microscope as a measuring device.
  • a mold having a target concavo-convex inversion structure on each surface of a nickel substrate is manufactured by a known machining process.
  • a molded body 1 of each example described later is obtained by an injection molding machine using a polypropylene resin and a mold as a cavity mold.
  • Polypropylene has a low resin temperature during molding, among general-purpose resins, when molding the surface of a substrate. For this reason, injection molding and hot press molding are facilitated by using polypropylene as the base material. Polypropylene has a low surface tension of about 29 mN / m and high water repellency among general-purpose resins. For this reason, water repellency can be improved more.
  • Polypropylene is a soft resin among the resins, but by setting the durometer hardness to 55 or more, preferably 60 or more, the deformation of the protrusion 2 is suppressed, and the deformation of the tip of the protrusion 2 is caused. It is possible to suppress the entanglement of dirt and improve the wiping property.
  • the molded body 1 obtained as described above is obtained by observing the concavo-convex surface 4 or cross section with a laser microscope or a scanning electron microscope, and obtaining the molded body 1 having the concavo-convex shape having the dimensions shown in FIG. Can do.
  • a contact angle and a falling angle of 5 ⁇ L of distilled water are selected.
  • a contact angle meter DM-501 manufactured by Kyowa Interface Science Co., Ltd. is used for measuring the contact angle and the sliding angle.
  • the drop angle is expressed as “> 90 degrees”, assuming that the drop angle does not fall even when the substrate surface is vertical, and is greater than 90 degrees.
  • the droplet When measuring the contact angle, the droplet is observed from a direction (for example, upward in FIG. 2) perpendicular to the longitudinal direction of the protrusion 2 (for example, the depth direction in FIG. 2).
  • the droplet When measuring the tumbling angle, the droplet is tumbled in a direction parallel to the longitudinal direction of the protrusion 2 (for example, the depth direction in FIG. 2), and the tumbling angle is measured.
  • the wiping property is made to adhere to the uneven surface 4 using a mixture of carbon black and oil so that it can be easily visually judged as simulated dirt.
  • a neutral detergent here, a liquid crystal TV cloth using ultra-fine fiber Belima X®
  • ⁇ is indicated. If the dirt is thinner than before wiping, “ ⁇ ” is indicated. If the dirt cannot be wiped off or if the dirt spreads more than before wiping, it is evaluated as “x”.
  • each molded object 1 shows the same tendency also with respect to another stain
  • Example 1 By the said manufacturing method, the molded object 1 which has the uneven
  • the structure of the uneven surface 4 is such that both the protrusion 2 and the recess 3 have a triangular cross-sectional shape and are arranged as shown in FIGS. 3A to 3C.
  • the molded body 1 of this example is designed so that the width L at the top of 1 ⁇ m from the bottom of the recess 3 is 2.8 ⁇ m, the depth D of the recess 3 is 12.5 ⁇ m, and the recess width w of the recess 3 is 35 ⁇ m. ing.
  • FIG. 10 is a diagram showing the evaluation results of the wiping property and water repellency of the uneven surface 4 located on the surface of the base material of the molded body 1 of the present embodiment.
  • the width L of the concave portion 3 is 2 ⁇ m or more, and it can be confirmed that the dirt is easy to wipe off and the attached dirt is thinner than before the wiping.
  • the aspect ratio D / w is 0.3 or more, the water contact angle is 130 degrees, and it is confirmed that the water repellency is high.
  • a sample in which a general fluorine coat is applied to a flat plate without unevenness has a water contact angle of 115 degrees, and the water repellency of the molded product 1 of Example 1 is sufficiently higher than that of the sample. Is excellent.
  • Example 2 The shape of the concavo-convex surface 4 of the molded body 1 of this example is such that the side surface of the protrusion 2 has an arc shape, the tip portion is formed in a triangular shape, and the bottom portion of the concave portion 3 is formed in an arc shape. Arranged as shown in FIG. 4C.
  • the molded body 1 is designed so that the width L at the top of 1 ⁇ m from the bottom of the recess 3 is 3.7 ⁇ m, the depth D of the recess 3 is 24 ⁇ m, and the recess width w of the recess 3 is 23.5 ⁇ m.
  • a fluorine-based coating agent is applied to the uneven surface 4 as an antifouling coating agent.
  • the groove width L of the recess 3 is 2 ⁇ m or more, and it is confirmed that the dirt is easily wiped off and the attached dirt is thinner than before the wiping.
  • the aspect ratio D / w is 0.7 or more, the water contact angle is 150 degrees, and the water repellency is improved.
  • Example 3 The shape of the concavo-convex surface 4 of the molded body 1 of this example is such that the tip of the protrusion 2 is trapezoidal and the bottom of the recess 3 is formed in a flat shape, arranged as shown in FIGS. 5A to 5C. ing.
  • the molded body 1 has a groove width L of 12.5 ⁇ m above the bottom of the recess 3 by 12.5 ⁇ m, a depth D of the recess 3 of 23.5 ⁇ m, a recess width w of the recess 3 of 24.5 ⁇ m, and a trapezoidal shape of the protrusion 2. It is designed so that the width of the flat surface at the tip of the tip is 5 ⁇ m.
  • the water contact angle of the molded body 1 of Example 3 is 140 degrees, which is lower than that of Example 2. This is presumably because the contact area between the base material and the liquid droplets is increased by making the cross-sectional shape of the protrusion 2 a trapezoidal shape, and water droplets are likely to adhere to the base material.
  • Example 4 The shape of the concavo-convex surface 4 of the molded body 1 of this example is a shape in which the protrusion 2 is a combination of a trapezoid and a triangle (a cross-sectional shape is a trapezoid and a triangle is added to the tip).
  • the bottoms of the recesses 3 are formed in a flat shape and are arranged as shown in FIGS. 6A to 6C.
  • the molded body 1 is designed so that the groove width L at the top of 1 ⁇ m from the bottom of the recess 3 is 18.4 ⁇ m, the depth D of the recess 3 is 24 ⁇ m, and the recess width w of the recess 3 is 33 ⁇ m.
  • the molded body 1 of Example 4 has a wider groove width L and a smaller aspect ratio D / L of 1.3. Is better than Example 1. Furthermore, D / w is 0.7 or more and the water contact angle is 160 degrees, and high water repellency can be obtained.
  • the tip of the projection 2 of the molded body 1 is further rounded (rounded so as to have an arc) (not shown), thereby facilitating wiping off dirt with a weaker force.
  • Example 4a The molded body 1 of this example has the same uneven surface 4 shape as that of Example 4, and is evaluated using polypropylene with 5 parts of a graft-polymerized silicone resin as an additive.
  • the molded body 1 has a contact angle improved as compared with Example 4 due to the addition of silicone, and the dirt can be easily wiped off with a weaker force.
  • the additive of the molded body 1 is not only a graft-polymerized silicone, but also a system in which gum or rubber-like silicone is mixed in a resin, paraffin is mixed or grafted
  • the same effect can be obtained by polymerized systems, silicone oils, hydrocarbons, oils containing ethers or esters, systems containing fluorine-containing oils or resins, and combinations thereof.
  • Example 5 The shape of the concavo-convex surface 4 of the molded body 1 of this example is such that the protrusions 2 are trapezoidal and the bottoms of the recesses 3 are flat, and are arranged as shown in FIGS. 7A to 7C. .
  • the molded body 1 of this example has a groove width L of 18.4 ⁇ m above the bottom of the recess 3 by 18.4 ⁇ m, a depth D of the recess 3 of 25 ⁇ m, a recess width w of the recess 3 of 33 ⁇ m, and a trapezoidal shape of the protrusion 2.
  • the width of the tip flat portion is designed to be 2 ⁇ m.
  • the wiping property is improved as compared with the first embodiment. Furthermore, D / w is 0.7 or more and the water contact angle is 155 degrees, and high water repellency can be obtained.
  • the shape of the concavo-convex surface 4 of the molded body 1 of this example is such that the projection 2 has a circular arc shape, and the bottom of the concave portion 3 also has a circular arc shape, and is arranged as shown in FIGS. 8A to 8C. is doing.
  • the material a material in which an elastomer component is mixed with polypropylene is used.
  • the molded body 1 of this example is designed so that the groove width L at the top of 1 ⁇ m from the bottom of the recess 3 is 3.7 ⁇ m, the depth D of the recess 3 is 11 ⁇ m, and the recess width w of the recess 3 is 11 ⁇ m. Yes.
  • the width L of the concave portion 3 is the same as that of Example 2, and the aspect ratio D / L. Despite being small, the wiping property is equivalent or deteriorated at the visual level. This is probably because the resin hardness has decreased.
  • FIGS. 9A and 9B are schematic views showing the cross-sectional shape of the uneven surface of the molded body in Comparative Example 1.
  • FIG. 9C is a schematic perspective view of the uneven surface of the molded body in Comparative Example 1.
  • the molded body 1 is designed so that the groove width L at the top of 1 ⁇ m from the bottom of the recess 3 is 1.2 ⁇ m, the depth D of the recess 3 is 42 ⁇ m, and the recess width w of the recess 3 is 24 ⁇ m.
  • the molded body 1 has high water repellency, but the groove width L of the recess 3 is small, and dirt is hardly wiped off. Moreover, the dirt spreads and spreads by wiping off the dirt, and the dirt tends to be more noticeable than before the wiping.
  • the molded body 1 is designed so that the groove width L 1 ⁇ m above the bottom of the recess 3 is 1.2 ⁇ m, the depth D of the recess 3 is 26 ⁇ m, and the recess width w of the recess 3 is 24 ⁇ m.
  • the molded body 1 has high water repellency, but has a small groove width L and hardly wipes off dirt. Further, the dirt spreads and spreads by wiping, and the dirt tends to be more noticeable than before wiping.
  • FIG. 11A, FIG. 12A, and FIG. 12B are diagrams for describing cross-sectional dimensions of the molded body 1 cut perpendicularly to the concave and convex grooves in the second embodiment of the present disclosure.
  • FIG. 11B is a diagram for describing a planar dimension of the uneven shape of the molded body 1 according to the second embodiment of the present disclosure.
  • the width of the bottom 6 of the protrusion 2 is M
  • the depth of the recess 3 that is the distance from the bottom 6 of the recess 3 to the apex 5 of the protrusion 2 is D
  • the width of the bottom 6 of the recess 3 is Let L be.
  • T be the tip width at which a virtual line that is 5 ⁇ m apart from the apex 5 of the protrusion 2 toward the bottom 6 of the recess 3 and is horizontal (parallel to the bottom) is cut off by the contour line of the cross section.
  • the radius of the arc when the shape of the vertex 5 of the protrusion 2 is approximated by an arc is R.
  • the dimension specifications of the bottom width M of the protrusion 2, the depth D of the recess 3, and the width L of the bottom of the recess 3 are constant in any cross section. However, dimensional variations due to sink marks and warps that are unavoidable in manufacturing are allowed.
  • the molded body 1 By providing the molded body 1 with the uneven surface 4, a large amount of air can be included in the interface between the uneven surface 4 and the droplet. Since air is a completely hydrophobic substance, the molded body 1 exhibits water repellency. In order to contain a large amount of air in the concave portion 3 on the surface of the molded body 1, there is a method of increasing the protrusion 2, that is, increasing the aspect ratio of the height of the protrusion 2 to the width of the bottom.
  • the protruding portion 2 when the protruding portion 2 is made higher, it becomes easier to receive stress due to wear, and the tip portion of the protruding portion 2 is bent, and as a result, the water repellency may be lowered.
  • the inventors have found that by reducing the distance between the protrusions 2 to a certain extent or less, the amount of air retained by the recesses 3 can be increased and water repellency can be exhibited even at a low aspect ratio.
  • the cause of the decrease in water repellency due to wear was examined by cross-sectional observation.
  • the protrusion 2 is worn and shortened, and the aspect ratio is not lowered, but it is bent at a portion about 5 ⁇ m below the apex of the protrusion 2 and the contact area between the droplet and the tip of the protrusion 2 is increased ( It was found that the reduction of the water repellency is that the contact area with air is reduced).
  • the inventors have defined the width between the protrusions 2 within a certain range, and by making the tip of the protrusion 2 have a curved shape, The knowledge that bending can be reduced was obtained. That is, by making the tip portion of the projection portion 2 a curved surface, the projection portion 2 can be given slidability and the stress applied to the tip portion of the projection portion 2 can be dispersed, thereby reducing bending. Can be made.
  • a configuration in which the protrusions 2 are covered with a coat layer may be employed (not shown). Since the coating layer is the same as that of the first embodiment, the description thereof is omitted.
  • the dimensions described in this embodiment are measured using at least one of a laser microscope for shape measurement and a scanning electron microscope.
  • the error due to the measurement is within ⁇ 0.1 ⁇ m.
  • the appropriate range of dimensions of the width M of the bottom of the cross section of the protrusion 2, the depth D of the recess 3, the width L of the bottom of the recess 3, and the tip width T of the imaginary line of the protrusion 2 according to the present embodiment Will be described based on results derived from experiments.
  • the molded body 1 is produced by injection molding so that the uneven surface 4 has uneven shapes of various dimensions.
  • a mold for transferring a concavo-convex shape having a desired dimension is prepared.
  • a diamond cutting tool having a desired size is produced, and a groove is formed in a brass flat plate by a known cutting process, and nickel plating is performed thereon to form a die.
  • polypropylene is used as the resin, but the present disclosure is not limited to this example. However, it is desirable to have a surface tension equivalent to or lower than that of polypropylene (or surface free energy).
  • the hardness of the resin that affects the wear characteristics is preferably about the same as that of polypropylene.
  • the durometer hardness (D type) is about 60 to 80.
  • a hard resin such as an acrylic resin (with the same hardness of about 85) and a soft resin such as an elastomer resin (with the same hardness of about 55)
  • the water repellency can be obtained even if the same stipulations are used. At least one of the wear resistance effects is low.
  • Injection molding is performed under proper mold temperature and molding conditions to obtain a 70 ⁇ 70 mm, 2 mm thick propylene flat plate, which is used as an experimental sample shown in FIGS. 13A to 13C. Note that an operation for adjusting the transferability and increasing the types of dimensions is performed according to the molding conditions (particularly the mold temperature).
  • FIG. 13A is a diagram illustrating a cross-sectional shape of a protrusion with a sharp tip in the second embodiment of the present disclosure.
  • FIG. 13B is a diagram illustrating a cross-sectional shape of a protrusion with a flat tip in the second embodiment of the present disclosure.
  • FIG. 13C is a diagram illustrating a cross-sectional shape of a protrusion having an arcuate tip in the second embodiment of the present disclosure.
  • the contact angle with respect to the water droplet is measured, and the water repellency is determined from the value of the contact angle. This is based on the fact that the degree of deformation of the protrusion 2 on the uneven surface 4 correlates with the contact angle. If the deformation of the protrusion 2 is large, the contact angle becomes small. On the other hand, if the wear of the protrusion 2 is suppressed, the deformation of the tip of the protrusion 2 is small, and the contact angle is large (the contact angle is less decreased).
  • a contact angle meter DM-501 type manufactured by Kyowa Interface Science Co., Ltd. is used, and 5 ⁇ l of distilled water is used as the liquid.
  • the performance in a state where frictional stress is not applied to the uneven surface 4 of the molded body 1 is set as initial water repellency, and the performance in a state after a predetermined wear reciprocation is determined as wear resistance. Assess as gender.
  • the wear reciprocation method of the concavo-convex surface 4 of the molded body 1 is performed using a cotton cloth wetted with distilled water, with a load of 500 g, a reciprocating speed of 60 reciprocations / minute, and a stroke of 70 mm.
  • the number of reciprocations is set to 1040 reciprocations and 5200 reciprocations assuming the actual number of wiping cleanings.
  • the initial water repellency of the molded body 1 is 140 ° “ ⁇ ” when the contact angle is 140 ° or more, and 150 ° “ ⁇ ” when the contact angle is 150 ° or more. If each contact angle is not satisfied, enter “x”.
  • the contact angle is 140 degrees or more, the water droplet is rolling like a ball on the surface.
  • the contact angle is set to 140 ° as a water repellency reference angle.
  • the contact angle of 130 degrees is not realized only by chemical treatment such as fluorine coating, but is an angle that is realized for the first time by the uneven shape of the uneven surface 4, and is thus set as a reference angle for wear resistance.
  • FIG. 14 is a diagram showing an experimental result when the R dimension at the tip of the protrusion 2 is smaller than 1 ⁇ m as shown in FIG. 13A.
  • the aspect ratio D / L is 0. Even when the value is as small as 6 (1-2, 1-6), the initial water repellency is as high as 140 degrees or more. This is presumably because the water droplet comes into contact with the surface of the concavo-convex surface 4 in a state close to point contact, and the water droplet is surrounded by air and approaches a spherical shape.
  • the groove width L of the concave portion 3 is as wide as 48 ⁇ m (1-9, 1-10), water drops fall into the concave portion 3, and not only point contact but also contact with the side surface of the protrusion 2 occurs.
  • the contact angle does not exceed 140 degrees.
  • the wear resistance of the molded body 1 is already lower than the contact angle of 130 degrees after 1040 reciprocations of wear even in the case where the aspect ratio D / L is in the range of 0.3 to 2.2. It is turning. This is presumably because the tip of the projection 2 is thin, and the tip of the projection 2 is easily bent by frictional stress, increasing the contact area with water droplets.
  • the initial water repellency exceeds the contact angle of 140 ° and 150 ° within the aspect ratio D / L of 0.6 to 2.2. Will reach the degree. However, it can be seen that the wear resistance is weak.
  • FIG. 15 is a diagram showing experimental results when the tip width A of the protrusion 2 is 3 ⁇ m as shown in FIG. 13B.
  • the initial water repellency is not contacted even if the depth D of the recess 3 is as deep as 44 ⁇ m and the aspect ratio D / L is as large as 2.2.
  • the angle is less than 140 degrees. This is presumably because the contact area between the water droplet and the air layer cannot be sufficiently secured, and a nearly spherical shape cannot be formed due to the surface tension between the water droplet and air.
  • the wear resistance is such that the contact angle is 130 degrees or more even after 5200 round-trip wear. This is presumably because the tip of the protrusion 2 is thick, and the change in the contact area with the water droplets can be kept small without bending the tip easily due to frictional stress.
  • the inventors diligently studied to tie these relations from the production of the molded body 1 having various uneven shapes on the uneven surface 4, measurement of main dimensions, and measurement results of water repellency. As a result of the study, it was found that there are shapes and dimensional regions that realize water repellency and wear resistance at the same time with good performance.
  • the shape is a case where the tip of the protrusion 2 is a shape close to an arc and the shape dimension is within a specific range.
  • FIG. 16 is a diagram showing experimental results when the R dimension of the tip of the protrusion 2 is 1 to 4 ⁇ m as shown in FIG. 13C.
  • the radius when approximated to R (circular) is 1 to 3 ⁇ m
  • the groove width L of the recess 3 is 14 to 35 ⁇ m
  • the aspect ratio D / L is in the range of 0.6 to 2.2
  • the initial water repellency is a contact angle of 140 degrees or more.
  • the aspect ratio D / L is in the range of 1.8 to 2.2
  • the initial water repellency reaches a contact angle of 150 degrees.
  • the wear resistance of the molded body 1 if the aspect ratio D / L is in the range of 0.3 to 1.8, the contact angle of 130 degrees can be maintained after 1040 cycles of wear.
  • the contact angle of initial water repellency is 140
  • the dimension at which the contact angle is 130 degrees or more even after the 1040 reciprocation of wear is 4 ⁇ m ⁇ T ⁇ 10 ⁇ m.
  • tip width T of the protrusion 2 exceeds 10 ⁇ m (No. 3-1, 3-7, 3-13, 3-17), high water repellency cannot be obtained in the initial stage. This is because even if the radius R of the tip of the projection 2 is small and the aspect ratio D / L is 0.6, water droplets of the projection 2 in the shape that suddenly thickens from the tip of the projection 2 This is considered to be due to the contact with the side surface and the contact area cannot be made sufficiently small.
  • the tip width T of the protrusion 2 is smaller than 4 ⁇ m (No. 3-4), it is likely to be deformed by stress and it is difficult to ensure wear resistance.
  • the tip width T of the protrusion 2 is 5.5 ⁇ m (No. 3-9) and 7.0 ⁇ m (No. 3-14),
  • the contact angle is 130 degrees or more, and the initial water repellency also exceeds the contact angle 150 degrees.
  • FIG. 17A is a diagram illustrating a cross-sectional configuration of the protrusion 2 according to the third embodiment of the present disclosure
  • FIG. 17B is a plan view of the protrusion 2 according to the third embodiment of the present disclosure
  • FIG. 18A is a diagram illustrating a cross-sectional configuration of the protrusion 2 according to the third embodiment of the present disclosure
  • FIG. 18B is an arc-shaped cross section of the protrusion 2 according to the third embodiment of the present disclosure. It is a figure which shows a structure.
  • the distance between the protrusions 2 is w
  • the depth of the recess 3 from the bottom 6 of the recess 3 to the vertex 5 of the protrusion 2 is D
  • the position above the bottom 6 of the recess 3 is a predetermined dimension.
  • the groove width of the recess 3 at the upper position of 1 ⁇ m is L
  • the width of the protrusion 2 is M
  • the position below the apex 5 of the protrusion 2 by a predetermined dimension and in this embodiment, the position is lowered to the bottom at the position 3 ⁇ m below
  • T is the tip width of the protrusion 2 cut by a horizontal imaginary line.
  • the radius of the arc when the shape of the vertex 5 of the protrusion 2 is approximated by an arc is R.
  • the groove width L of the recess 3 is set to a width dimension at a position 1 ⁇ m above the bottom 6.
  • the tip width T of the protrusion 2 is set to a width 3 ⁇ m below the apex 5 of the protrusion 2 because the droplet sinks into the protrusion 2 due to its own weight, and the droplet, solid plane, and air
  • the position of the three-phase interface is a position below the apex 5 by a predetermined dimension, and in this embodiment, water is used as the liquid, so that the position is about 3 ⁇ m below.
  • the tip of about 3 ⁇ m from the top 5 of the protrusion 2 enters the droplet.
  • the shape of the tip of the vertex 5 does not significantly affect the water repellency, and the water repellency is the tip width of the vertex 5, that is, a droplet and a solid. It greatly affects the interface area. Therefore, the tip width (width having a positive correlation with the interface area) is defined with reference to the lower part of 3 ⁇ m from the vertex 5.
  • the transfer system is mentioned as a method of arranging an unevenness
  • the molded body 1 can provide a large amount of air at the interface between the substrate surface and the liquid droplets by providing the uneven surface 4 and exhibits water repellency. Since air is a completely hydrophobic substance, the droplets exhibit water repellency.
  • a cleaning tool used in a general household is assumed.
  • it is a wiping and cleaning product made of fibers such as elephants, towels, handkerchiefs, towels, tissue paper, kitchen paper, and toilet paper.
  • the inventors have defined the groove width L of the recess 3 within a relatively large predetermined range, and the tip width T of the protrusion 2 is a relatively small predetermined width. It has been found that it is possible to achieve both ease of wiping off dirt and water repellency by prescribing within the range. That is, increasing the groove width L of the recess 3 can scrape dirt that has entered the recess 3, while reducing the tip width T of the projection 2 reduces the contact area with the droplet. Can improve water repellency.
  • the protrusion 2 may be covered with a coat layer (not shown).
  • the coating layer is the same as that in the first embodiment, and thus the description thereof is omitted.
  • the molded body 1 was produced by injection molding into a shape in which the uneven surface 4 has uneven shapes with various dimensions.
  • a flat plate made of propylene having a size of 70 ⁇ 70 mm and a thickness of 2 mm is obtained.
  • a flat plate having an uneven surface 4 having a cross-sectional shape shown in each of FIGS. 19A to 20B is an experimental sample.
  • the molding conditions particularly, the mold temperature
  • the transferability to the mold is changed, and an operation of increasing the types of the uneven shape dimensions is performed.
  • FIG. 19A is a diagram illustrating a cross-sectional configuration of the protrusion when the tip is pointed according to the third embodiment of the present disclosure.
  • FIG. 19B is a diagram illustrating a cross-sectional configuration of the protrusion when the tip is flat according to the third embodiment of the present disclosure.
  • FIG. 19C is a diagram illustrating a cross-sectional configuration of the protrusion in the case where the tip end has an arc shape in the third embodiment of the present disclosure.
  • FIG. 20A is a diagram illustrating a cross-sectional configuration of the protrusion when the groove center is a curved surface according to the third embodiment of the present disclosure.
  • FIG. 20B is a diagram illustrating a cross-sectional configuration of the protrusion when the groove edge is a curved surface according to the third embodiment of the present disclosure.
  • FIG. 21 and FIG. 22 show the results of observing the concavo-convex concavo-convex surface 4 and the cross section obtained as described above with a laser microscope or a scanning electron microscope and measuring the shape dimensions.
  • the water repellency of the molded body 1 is determined by measuring the contact angle with water droplets.
  • a contact angle meter DM-501 manufactured by Kyowa Interface Science Co., Ltd. is used as in the second embodiment, and 5 ⁇ l of distilled water is used as the liquid.
  • the wiping property is determined based on whether or not the simulated dirt can be physically wiped with a wiping tool by attaching the simulated dirt to the uneven surface 4.
  • a wiping tool As the simulated dirt, a mixture of carbon black and oil is used so that visual judgment is easy.
  • commercially available tissue paper having a fiber diameter of several ⁇ m to several tens of ⁇ m for example, trade name Eliere (trademark) is used.
  • the evaluation of the wiping property is “ ⁇ ” if it can be wiped off or remains thin by visual evaluation, but the dirt remains, but the dirt is clearly thinner than before wiping. In the case of “ ⁇ ”, it is not possible to wipe off, or “ ⁇ ” is indicated when the remaining dirt is conspicuous even if wiped off.
  • FIG. 21 is a diagram showing an experimental result when the projections 2 have a concavo-convex shape as shown in FIGS. 19A, 19B, and 20A, and the tip of the protrusion 2 is sharp.
  • the groove width L of the recess 3 is 12 to 90 ⁇ m and the aspect ratio D / L is 0.2.
  • water repellency 120 degrees or more and less than 130 degrees can be obtained. This is presumably because the tip width T of the protrusion 2 is as narrow as 1.0 to 3.8 ⁇ m and the contact area with the water droplet is small.
  • the wiping property is “ ⁇ ”. This is presumed to be because the groove width L of the recess 3 is too narrow, so that the dirt that has entered cannot be scraped off. Further, when the groove width L of the recess 3 is 14 ⁇ m and the depth D of the recess 3 is 12 ⁇ m (No. 1-2) or 35 ⁇ m (No. 1-3), the wiping property is “ ⁇ ”. This is presumably because the depth of the recess 3 becomes a barrier and is difficult to be scraped off.
  • the groove width L of the concave portion 3 is 14 to 100 ⁇ m, the simulated dirt can be wiped off to some extent. This is presumably because the recess 3 has a sufficient width to scrape off dirt.
  • the groove width L of the recess 3 is 14 ⁇ m ⁇ L ⁇ 90 ⁇ m
  • the aspect ratio D / L is 0.2 ⁇ D / L ⁇ 1.2
  • the tip width T of the protrusion 2 is 1
  • FIG. 22 is a diagram showing an experimental result when the dimension of the radius R of the arc approximate to the shape of the vertex 5 of the protrusion 2 is larger than 1 ⁇ m, as shown in FIG. 19C and FIG. 20B. is there.
  • the groove width L of the recess 3 is in the range of 14 to 90 ⁇ m
  • the aspect ratio D / L is 0.2 to 1.2
  • the tip width T of the protrusion 2 is in the range of 4.4 to 11.0 ⁇ m.
  • the groove width L of the recess 3 is 14 ⁇ m ⁇ L ⁇ 90 ⁇ m
  • the aspect ratio D / L is 0.2 ⁇ D / L ⁇ 1.2
  • the tip width T of the protrusion 2 is 4.4 ⁇ m ⁇
  • T ⁇ 11.0 ⁇ m both water repellency of at least 120 degrees and less than 130 degrees and wiping properties can be achieved.
  • the groove width L of the recess 3 is 14 ⁇ m ⁇ L ⁇ 90 ⁇ m
  • the aspect ratio D / L is 0.2 ⁇ D / L ⁇ 1.2
  • the tip width of the protrusion 2 When T is 1 ⁇ m ⁇ T ⁇ 11 ⁇ m (or the radius R of the arc approximating the apex 5 of the protrusion 2 is 0 ⁇ m ⁇ R ⁇ 6 ⁇ m), the water repellency of at least 120 degrees and less than 130 degrees and the wipeability of dirt It is possible to achieve both.
  • the groove width L of the recess 3 is 14 ⁇ m ⁇ L ⁇ 55 ⁇ m, the aspect ratio D / L is 0.2 ⁇ D / L ⁇ 1.2, and the tip width T of the protrusion 2 is 1.0 ⁇ m ⁇ T ⁇ 8.
  • the water repellency of at least 130 degrees and less than 140 degrees can be compatible with the wiping property. .
  • the groove width L of the recess 3 is 58 ⁇ m (No. 2-10, 2-13), a contact angle of 130 degrees cannot be obtained as water repellency.
  • the tip width T of the protrusion 2 is narrow at 8.0 ⁇ m and 7.7 ⁇ m, respectively, the radius R of the tip of the protrusion 2 is large, so that the contact area with water droplets at the vertex 5 of the protrusion 2 increases. Presumed to be.
  • the groove width L of the recess 3 is 14 ⁇ m ⁇ L ⁇ 55 ⁇ m, the aspect ratio D / L is 0.2 ⁇ D / L ⁇ 1.2, and the tip width T of the protrusion 2 is 1.0 ⁇ m ⁇ T ⁇ 6. .0 ⁇ m (or when the radius R of the arc approximating the vertex 5 of the protrusion 2 is 0 ⁇ m ⁇ R ⁇ 2 ⁇ m), it is possible to achieve both high water repellency of 140 degrees or more and dirt wiping property. .
  • durable consumer goods including household appliances such as vacuum cleaners, refrigerators, air conditioners, washing machines, hot water washing toilet seats, microwave ovens, and rice cookers, and automobiles, interior and exterior building materials, inner surfaces of packaging materials, and It is applicable to spouts or cap parts that require liquid drainage and is useful.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un corps moulé comportant un matériau de base et une pluralité de parties de projection disposées sur la surface du matériau de base. La largeur de rainure entre la pluralité de parties de projection est de 2 µm ou supérieure à 1 µm au-dessus d'une partie inférieure, et l'angle formé par un plan passant à travers la partie inférieure et les surfaces latérales des parties de projection est de 90 degrés ou moins. De plus, le corps moulé est pourvu d'un matériau de base et d'une pluralité de parties de projection disposées sur une surface irrégulière du matériau de base, et dans une section transversale perpendiculaire à la direction longitudinale de l'agencement de la surface irrégulière, la largeur de rainure d'une partie d'évidement est désignée L, la profondeur de la partie d'évidement est désignée D, la largeur de la partie inférieure de la section transversale de chacune de la pluralité de parties de projection est désignée M, et une ligne virtuelle qui est horizontale et s'étend de 5 µm vers la partie inférieure à partir du point de crête de section transversale de chacune des sections transversales de la pluralité de parties de projection est désignée comme une largeur d'extrémité avant T qui est coupée par les lignes de contour des sections transversales des parties de projection. En outre, 14 μm ≤ M ≤ 35 μm, 0,6 ≤ D/L ≤ 1,8, et 4 μm ≤ T ≤ 10 μm. Les points de crête des sections transversales des parties de projection présentent des formes incurvées.
PCT/JP2017/046076 2017-01-05 2017-12-22 Corps moulé WO2018128092A1 (fr)

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WO2021215243A1 (fr) * 2020-04-24 2021-10-28 パナソニックＩｐマネジメント株式会社 Corps moulé et procédé de production de corps moulé
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WO2022180466A1 (fr) * 2021-02-23 2022-09-01 3M Innovative Properties Company Articles médicaux ayant une surface microstructurée ayant une élimination accrue de micro-organismes lorsqu'ils sont nettoyés et procédés associés
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WO2022180466A1 (fr) * 2021-02-23 2022-09-01 3M Innovative Properties Company Articles médicaux ayant une surface microstructurée ayant une élimination accrue de micro-organismes lorsqu'ils sont nettoyés et procédés associés

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