WO2023084705A1 - Article moulé en résine - Google Patents

Article moulé en résine Download PDF

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Publication number
WO2023084705A1
WO2023084705A1 PCT/JP2021/041578 JP2021041578W WO2023084705A1 WO 2023084705 A1 WO2023084705 A1 WO 2023084705A1 JP 2021041578 W JP2021041578 W JP 2021041578W WO 2023084705 A1 WO2023084705 A1 WO 2023084705A1
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WO
WIPO (PCT)
Prior art keywords
uneven surface
coating film
base material
paint
resin molded
Prior art date
Application number
PCT/JP2021/041578
Other languages
English (en)
Japanese (ja)
Inventor
寺尾玄
直原佑哉
Original Assignee
バルミューダ株式会社
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
Application filed by バルミューダ株式会社 filed Critical バルミューダ株式会社
Priority to PCT/JP2021/041578 priority Critical patent/WO2023084705A1/fr
Publication of WO2023084705A1 publication Critical patent/WO2023084705A1/fr

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin

Definitions

  • the present invention relates to resin molded products.
  • Texturing is a type of surface treatment method for base materials such as resins and metals that are used to mold industrial products. Graining is used to create a sense of luxury and beauty in the appearance of industrial products. It is desirable that texture-finished industrial products do not appear to have a feeling of use even if the industrial products are used continuously, and that the appearance of the texture finish is maintained indefinitely to maintain the same state as a new product. Therefore, when the textured surface of the base material is coated with paint, the thickness of the coating film is set thin so as not to impair the textured appearance. In industrial products that are required to be maintained in a state similar to new, the shape of the uneven surface and the thickness of the coating film are set on the premise that the coating film will not peel off.
  • Patent Documents 1 to 3, for example So far, there have been proposals related to texture processing and coating films.
  • the morphology (color, pattern, etc.) of the entire uneven surface is changed so that the product can be used continuously.
  • the resin molded product according to the present invention is a resin molded product obtained by molding a base material made of resin, the base material having an uneven surface subjected to texturing, the uneven surface being coated with a paint, and the uneven surface
  • the thickness of the coating film of the coating material on the recesses is larger than the thickness of the coating film of the coating material on the projections of the uneven surface.
  • the shape of the entire uneven surface changes to produce a feeling of use due to continued use of the product. Appears in the appearance of the product as
  • FIG. 3 is a schematic cross-sectional view of the base material showing a coating film of a paint coating the surface. It is a reference drawing which shows the depth of the uneven
  • FIG. 4 is a schematic cross-sectional view of the substrate showing a state in which the coating film has been peeled off from the protrusions on the surface.
  • FIG. 4 is a schematic cross-sectional view of the substrate showing a state in which the coating film on the projections on the surface is peeled off and the surface of the substrate is exposed.
  • FIG. 2 is a schematic diagram showing the relationship (2) between (a) the shape of the surface of the resin molded article according to the present invention and (b) the state of wear of the uneven surface of the substrate.
  • FIG. 3 is a schematic diagram showing the relationship (3) between (a) the surface morphology and (b) the wear state of the uneven surface of the base material of the resin molded product according to the present invention. It is a schematic diagram which shows the relationship (1) between (a) surface morphology of the conventional resin molding, and (b) the wear condition of the uneven surface of a base material. It is a schematic diagram which shows the relationship (2) of the conventional resin molding product (a) surface form, and (b) the wear condition of the uneven surface of a base material.
  • FIG. 11 is another electron micrograph of the surface of the resin molded article according to the present invention when the wear test (part 2) of the surface was carried out.
  • FIG. 1 is a perspective view showing an embodiment of a resin molded product (hereinafter referred to as "this product") according to the present invention.
  • the product is the housing of the smartphone 1 .
  • This product is, for example, the part of the exterior of a smartphone other than the touch panel display, which is held by the user's hand.
  • this product is not limited to smartphone housings, and may be smartphone cases or other industrial products.
  • FIG. 2 is a schematic cross-sectional view of the substrate 2 showing the shape of the surface of the substrate 2 on which the product is molded.
  • the base material 2 is made of resin, for example.
  • the type of resin is, for example, polycarbonate.
  • the figure shows that the substrate 2 has an uneven surface 2S.
  • the uneven surface 2 ⁇ /b>S is formed by texturing the surface of the base material 2 .
  • the texturing is performed, for example, by using a mold for manufacturing a housing in which an uneven pattern is formed by etching using the action of a chemical agent.
  • a base material (resin or the like) to be processed by this mold has an uneven surface transferred from the mold.
  • the base material on which the product is molded has a textured surface.
  • FIG. 3 is a reference diagram showing the name of each part of the uneven surface 2S.
  • the concave-convex surface 2S is configured by alternately arranging concave portions C and convex portions V.
  • the highest point of each convex portion V (upper end of the convex portion V on the paper surface of the figure) is the vertex VT of each convex portion V.
  • FIG. The lowest point of each recess C (lower end of the recess C on the paper surface of the drawing) is the bottom point CB of each recess C. As shown in FIG.
  • FIG. 4 is a schematic cross-sectional view of the substrate 2 showing the paint film 3 covering the uneven surface 2S.
  • the figure shows that the concave portion C and the convex portion V of the concave-convex surface 2S are coated with paint.
  • the paint is a known paint, for example a matte color paint.
  • the figure shows that, in the entire uneven surface 2S, the height of the coating film 3 of the paint covering the uneven surface 2S (the position in the vertical direction of the paper surface of the figure) is the highest at the vertex VT of each convex portion V. show.
  • the height of the vertex VT of each convex portion V (the position in the vertical direction of the paper surface of the same figure) is greater than the height of the surface 3S of the coating film 3 in each concave portion C (the position in the vertical direction of the paper surface of the same figure). is also high, indicating that
  • FIG. 5 is a reference diagram showing the depths of adjacent concave and convex portions (concave portion C and convex portion V (see FIG. 3)). As shown in the figure, the depth of the adjacent irregularities (the length in the up-down direction of the paper surface of the figure) is represented by D1.
  • FIG. 6 is a reference diagram showing the thickness of the coating film 3 at the vertex VT (see FIG. 3) of the convex portion V. As shown in FIG. As shown in the figure, the thickness of the coating film 3 at the vertex VT of the convex portion V (the length in the vertical direction of the paper surface of the figure) is represented by D2.
  • FIG. 7 is a reference diagram showing the thickness of the coating film 3 at the bottom point CB of the recess C (see FIG. 3). As shown in the figure, the thickness of the coating film 3 at the bottom point CB of the concave portion C (the length in the vertical direction of the paper surface of the figure) is represented by D3.
  • the depth D1 of the adjacent uneven portion and the thickness D3 of the coating film 3 at the bottom point CB of the concave portion C are determined when the convex portion V is worn and the surface of the substrate 2 is exposed.
  • the size is set so that the coating film of the paint 3 in the concave portion C adjacent to the convex portion V does not peel off.
  • the thickness D3 of the paint film 3 at the bottom point CB of the concave portion C is set larger than the thickness D2 of the paint film 3 at the top portion VT of the convex portion V.
  • the thickness D2 of the coating film 3 at the vertex VT of the convex portion V is the thickness of the vertex VT when the product is used for a predetermined period (when the number of times of friction received by the product reaches a predetermined number). It is set so that the surrounding coating film is peeled off.
  • the uneven shape of the uneven surface 2S is set so that the inclination angle of the slope from the apex VT of the convex portion V to the bottom point CB of the concave portion C is steep in the adjacent uneven portions.
  • the paint applied to the uneven surface 2S forms a thin coating 3 around the vertices VT of the projections V.
  • the paint applied around the vertex VT of the convex portion V flows toward the CB of the concave portion C and accumulates in the concave portion C to form a coating film 3 .
  • the thickness of the coating film 3 in the concave portion C is set to such a thickness that the coating film in the concave portion C does not peel off even if the periphery of the vertex VT of the convex portion V wears.
  • the average value of the depths D1 of adjacent irregularities in the entire irregular surface 2S is, for example, 80 microns.
  • the average value of the thickness D2 of the coating film 3 at each vertex VT of the convex portion V on the entire uneven surface 2S is, for example, 6 microns.
  • the average value of the thickness D3 of the coating film 3 at each of the bottom points CB of the recesses C over the entire uneven surface 2S is 30 microns.
  • FIG. 8 is a schematic cross-sectional view of the base material 2 showing a state in which the coating film 3 has been peeled off from the protrusions V. As shown in FIG. The figure shows a state in which the coating film 3 is peeled off at the location indicated by symbol P1, and the convex portion V is not coated with the coating.
  • the cause of peeling of the coating film 3 is, for example, friction between the hand of the user using the smartphone 1 and the product, or friction between the product and the fabric when the product is put in the pocket of the pants. Due to friction, friction between this product and the desk, etc. when placed on the desk, etc.
  • the height of the paint film 3 covering the uneven surface 2S (position on the upper side of the paper surface of FIG. 4) is the highest at the vertex VT of the convex portion V of the uneven surface 2S. Therefore, on the uneven surface 2S, the places where the coating film 3 is most likely to peel off due to friction between the product and the user's hand, etc., are around the vertexes VT of the convex portions V of the uneven surface 2S.
  • FIG. 9 is a schematic cross-sectional view of the base material 2 showing a state in which the coating film 3 has peeled off from the protrusions V and the surface of the base material 2 is exposed.
  • the figure shows a state in which the coating film 3 at the location indicated by symbol P2 has been peeled off, and the periphery of the apex VT of the convex portion V of the uneven surface 2S has been worn due to friction with the location.
  • the surface 2T of the substrate 2 is exposed due to wear around the vertex VT.
  • the height of the vertex VT of the convex portion V of the uneven surface 2S is higher than the height of the surface 3S of the coating film 3 in the concave portion C. Even if the periphery of the vertex VT of the projection V of the uneven surface 2S is worn, the coating film 3 in the recess C of the uneven surface 2S is not worn.
  • the color of the background of the base material 2 is selected, for example, so that the glossiness of the color of the worn background is higher than the glossiness of the color of the paint. That is, the color of the paint and the color of the background are the area where the coating film 3 is not peeled off, the area where the coating film 3 is peeled off, and the area where the background of the substrate 2 is exposed on the uneven surface 2S.
  • the color is toned so that a gradation of color density occurs between
  • ⁇ Relationship between the surface morphology of this product and the state of wear of the uneven surface of the base material ⁇ 10 to 12 are schematic diagrams showing the relationship between the surface morphology of the product and the wear state of the uneven surface of the substrate.
  • FIG. 10 is a schematic diagram of (a) the shape of the surface of the product, and (b) a cross-sectional view taken along the line AA of (a).
  • the same figure shows a state in which the coating film of the coating material covering the uneven surface of the base material is not peeled off.
  • the inclination angle of the slope connecting the protrusions and recesses of the adjacent protrusions and recesses is set steeply. Therefore, the thickness of the coating film on the convex portions is thinner than the thickness of the coating film on the concave portions. Also, the periodicity of the distances between adjacent recesses and protrusions is not regular.
  • the period of the height of each convex portion does not have regularity.
  • the surface of the uneven surface has an irregular area L1 where the color of the paint appears and an area L2 where the color of the base material appears through the coating film. Arranged by position and size.
  • FIG. 11 is a schematic diagram of (a) showing the shape of the surface of the product, and (b) showing a cross-sectional view taken along the line AA of (a).
  • the figure shows a state in which the coating film of the paint on the convex portions of the uneven surface of the base material is peeled off, exposing the background of the base material. That is, the uneven surface includes a region L1 around the concave portion where the coating film is thick, a region L2 around the convex portion where the coating film is thin, a region L3 around the convex portion where the paint is worn, and the surface of the base material is exposed. and a region L4 of the convex portion.
  • the color of the paint and the color of the background of the base material are toned so that a gradation of color density occurs between the regions L1, L2, L3, and L4 (for example, in descending order of color glossiness).
  • the colors are toned to be L1, L2, L3, and L4.
  • an area L3 where the color of the worn and polished paint appears is arranged around the area L4 where the color of the base material appears.
  • a region L2 in which the color of the base material appears through the coating film is arranged around the region L3.
  • L1 is arranged in which the color of the paint appears.
  • FIG. 12 is a schematic diagram of (a) showing the shape of the surface of the product, and (b) showing a cross-sectional view taken along the line AA of (a).
  • peeling of the coating film of the paint on the convex portions and exposure of the background of the base material progressed compared to the state of the uneven surface shown in FIG. Indicates status.
  • the size of a region L4 where the color of the base material appears and the size of a region L3 where the color of the worn and polished paint appears are larger than in the state shown in FIG. indicate that
  • ⁇ Relationship between the surface morphology of conventional resin molded products and the state of wear of the uneven surface of the base material ⁇ 13 to 15 are schematic diagrams showing the relationship between the surface morphology of a conventional resin molded product (hereinafter referred to as "conventional product") and the state of wear of the uneven surface of the substrate.
  • FIG. 13 is a schematic diagram of (a) showing the shape of the surface of a conventional product, and (b) showing a cross-sectional view taken along the line AA of (a).
  • the same figure shows a state in which the coating film of the coating material covering the uneven surface of the base material is not peeled off.
  • the distances between the adjacent recesses and protrusions are equal and the heights of the protrusions are substantially the same on the uneven surface of the conventional product.
  • the surface of the conventional product is coated with a coating film of uniform thickness over the entire surface.
  • FIG. 14 is a schematic diagram of (a) showing the shape of the surface of a conventional product, and (b) showing a cross-sectional view taken along the line AA of (a).
  • the figure shows a state in which the coating film covering the uneven surface of the base material is almost evenly peeled off over the entire uneven surface. That is, the height position of the uneven surface (the length in the up-down direction of the drawing) is substantially the same over the entire uneven surface.
  • almost the entire surface of the uneven surface is a region M3 where the background color of the base material appears through the thin coating film, and the base material is transparent through the coating film.
  • a region M2 in which the color of appears is part of the uneven surface.
  • FIG. 15 is a schematic diagram of (a) showing the shape of the surface of a conventional product, and (b) showing a cross-sectional view taken along the line AA of (a).
  • the peeling of the coating film of the paint progresses more than the state of the uneven surface shown in FIG. indicates that the As a result, as shown in (a) of the same figure, almost the entire surface of the uneven surface is a region M5 where the color of the background of the substrate appears, and the color of the background of the substrate appears through the thin coating film.
  • the region M4 with the ridge is a part of the uneven surface.
  • the slope angle between the adjacent concave and convex portions is not steep, and the entire surface of the uneven surface is coated with a uniform thickness. covered with a membrane. Therefore, when the uneven surface of the conventional product is rubbed, the coating film peels off uniformly over the entire surface of the uneven surface, and the same color appears over the entire surface. As a result, when the coating film on the uneven surface peels off, the conventional product does not produce gradation of color density in irregular positions and sizes like this product, and the surface where the coating film has peeled off uniformly does not occur. Some of them look like damaged areas.
  • Example ⁇ The following is an example using a smart phone housing (polycarbonate resin coated with UV curable paint) manufactured by the applicant of the present application.
  • Evaluation conditions and the like are as follows. Evaluation device: SURFTEST SJ-310 (Mitutoyo Corporation) Standard: JIS1982 Curve: P Filter: NONE Arbitrary length: 12.50mm Input: NONE Forward run/backward run: OFF Waveform deletion: OFF Pass/fail judgment: Average value
  • FIG. 16 is a graph showing measurement results of the surface of the housing before painting.
  • the horizontal axis in the figure indicates the surface direction of the uneven surface of the housing (corresponding to the horizontal direction on the paper surface of FIG. 2).
  • the vertical axis in the figure indicates the uneven direction of the uneven surface of the housing (corresponding to the vertical direction on the page of FIG. 2).
  • the horizontal axis is magnified 10 times and the vertical axis is magnified 200 times.
  • the figure shows the distance between adjacent recesses and protrusions, the height position of the bottom point of each recess (the position in the vertical direction of the paper surface of FIG. 16), and the height of the apex of each protrusion on the entire uneven surface.
  • the position (the position in the vertical direction of the paper surface of FIG.
  • Abrasion Test The following are the results of an abrasion test using an RCA abrasion tester on the surface of the housing of the smartphone manufactured by the applicant of the present application.
  • test conditions are as follows. ⁇ Abrasion times: 200 times ⁇ Pressure: about 1.7N ⁇ Rotation speed: 150rpm
  • FIG. 17 is an electron micrograph of the surface after abrasion testing (10 RCAs) on the surface of the housing.
  • the whitish spots in the area surrounded by the dashed lines in the figure are the spots where the paint film has peeled off.
  • the figure shows that the peeled portions of the coating film are not uniformly present over the entire surface, but are irregularly present over the entire surface.
  • FIG. 18 is an electron micrograph of the surface after the abrasion test (20 times RCA) on the surface of the housing.
  • a whitish portion within the region surrounded by the dashed line in the figure is a portion where the coating film of the paint has peeled off and the surface of the substrate is exposed.
  • the figure shows that the exposed portions of the base material are not uniformly distributed over the entire surface, but are irregularly distributed over the entire surface. That is, this figure shows that when the base material is exposed at a plurality of positions on the uneven surface, there is no positional regularity between the plurality of exposed positions.
  • the thickness of the coating film 3 of the paint on the concave portions C of the uneven surface 2S is greater than the thickness of the coating film of paint on the convex portions V of the uneven surface 2S. Therefore, when part of the coating film 3 covering the textured uneven surface 2S of the base material 2 is peeled off, or when the background of the base material 2 is exposed, irregular positions and sizes of the entire uneven surface 2S may occur. A gradation of shades of color appears in the area of lowness. In other words, the shape of the uneven surface 2S as a whole, in which irregular positions and sizes appear, appears in the appearance of the product as a presentation of the usability of the product as a result of continued use of the product.

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  • Laminated Bodies (AREA)

Abstract

Si un film de revêtement sur la surface d'un matériau de base gaufré est coupé ou si l'arrière du matériau de base est exposé, la figure de la totalité de la surface donne à un produit un aspect bien porté comme si le produit a été utilisé pendant une longue période.　Un article moulé en résine selon la présente invention est obtenu par moulage d'un matériau de base qui est formé d'une résine ; et le matériau de base a une surface en relief gaufrée qui est recouverte d'un matériau de revêtement. L'épaisseur du film de revêtement du matériau de revêtement dans une partie évidée de la surface en relief est supérieure à l'épaisseur du film de revêtement du matériau de revêtement dans une partie projetée de la surface en relief.
PCT/JP2021/041578 2021-11-11 2021-11-11 Article moulé en résine WO2023084705A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2021/041578 WO2023084705A1 (fr) 2021-11-11 2021-11-11 Article moulé en résine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/041578 WO2023084705A1 (fr) 2021-11-11 2021-11-11 Article moulé en résine

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Publication Number Publication Date
WO2023084705A1 true WO2023084705A1 (fr) 2023-05-19

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069804A (ja) * 1992-06-24 1994-01-18 Okamoto Ind Inc シート状成形物
JPH09216961A (ja) * 1995-12-07 1997-08-19 Sekisui Chem Co Ltd 帯電防止熱可塑性樹脂プレートもしくはシートの製造方法及びこれによって得られる帯電防止熱可塑性樹脂プレートもしくはシート
JP2000351190A (ja) * 1999-06-11 2000-12-19 Nippon Plast Co Ltd 塗装を施した樹脂成形品
JP2003154591A (ja) * 2001-09-04 2003-05-27 Toray Ind Inc 繊維強化熱可塑性プラスチック
JP2011169987A (ja) * 2010-02-16 2011-09-01 Sony Corp 防眩性フィルムおよびその製造方法、紫外線硬化型樹脂組成物、ならびに表示装置
JP2021066119A (ja) * 2019-10-25 2021-04-30 株式会社Ｌｉｘｉｌ タイル

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069804A (ja) * 1992-06-24 1994-01-18 Okamoto Ind Inc シート状成形物
JPH09216961A (ja) * 1995-12-07 1997-08-19 Sekisui Chem Co Ltd 帯電防止熱可塑性樹脂プレートもしくはシートの製造方法及びこれによって得られる帯電防止熱可塑性樹脂プレートもしくはシート
JP2000351190A (ja) * 1999-06-11 2000-12-19 Nippon Plast Co Ltd 塗装を施した樹脂成形品
JP2003154591A (ja) * 2001-09-04 2003-05-27 Toray Ind Inc 繊維強化熱可塑性プラスチック
JP2011169987A (ja) * 2010-02-16 2011-09-01 Sony Corp 防眩性フィルムおよびその製造方法、紫外線硬化型樹脂組成物、ならびに表示装置
JP2021066119A (ja) * 2019-10-25 2021-04-30 株式会社Ｌｉｘｉｌ タイル

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