WO2023171267A1 - 物品の鑑賞等用什器 - Google Patents
物品の鑑賞等用什器 Download PDFInfo
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- WO2023171267A1 WO2023171267A1 PCT/JP2023/005175 JP2023005175W WO2023171267A1 WO 2023171267 A1 WO2023171267 A1 WO 2023171267A1 JP 2023005175 W JP2023005175 W JP 2023005175W WO 2023171267 A1 WO2023171267 A1 WO 2023171267A1
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/005—Show cases or show cabinets with glass panels
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/006—Anti-reflective coatings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
Definitions
- the present invention stores various articles (for example, toys (models, figures, etc.), arts and crafts, etc.) and places them on a shelf or desk for viewing, storing, and exhibiting (hereinafter abbreviated as "appreciation, etc.”). related to fixtures used for
- a collection case that includes a mounting table on which the item to be viewed is placed, and a transparent cover that surrounds the item so that it can be seen through (Patent Document 1).
- halation irradiation light
- irradiation light illumination light, sunlight, etc.
- This type of fixture mounting stand is often seen by the user along with the objects to be viewed, so in addition to anti-reflection effects, high appearance quality is also required. Specifically, it has sometimes been required to apply a black anti-reflection film (for example, an uneven film) with a higher design quality.
- a black anti-reflection film for example, an uneven film
- An object of the present invention is to provide a fixture for use in viewing articles, which is effective in enhancing the appeal of objects to be viewed, and is equipped with a highly designed anti-reflection film.
- a black anti-reflection film formed on a mounting table for a fixture used for viewing an item satisfies the following requirements, thereby enhancing the appeal of the item to be viewed, etc.
- this method is effective in improving design quality.
- a liquid composition with a specific composition is used that contains a predetermined ratio of unevenness forming particles that include large and small inorganic particles having a predetermined particle size range in a predetermined mass ratio range.
- ⁇ A film of a predetermined thickness is formed by spray coating using the liquid composition having the above-mentioned specific composition.
- Fixtures used for viewing items, etc. are equipped with at least a mounting table on which the item is placed,
- the mounting table has a black anti-reflection coating on the main surface side on which the article is placed.
- the antireflection film consists of a film with a thickness of 2 ⁇ m or more and 40 ⁇ m or less formed by spray coating formed from a liquid composition,
- the liquid composition includes at least (A), (B), and (C), (B) is contained in an amount of 20% by mass or more and 60% by mass or less in 100% by mass of the total solid content of the composition, (B) contains 90% by mass or more of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less, Fixtures will be provided.
- a black anti-reflection coating formed on a mounting table on which an article is placed, of a fixture used for viewing the article, etc. Consisting of a film with a thickness of 2 ⁇ m or more and 40 ⁇ m or less formed by spray coating formed from a liquid composition,
- the liquid composition includes at least (A), (B), and (C), (B) is contained in an amount of 20% by mass or more and 60% by mass or less in 100% by mass of the total solid content of the composition, (B) contains 90% by mass or more of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less, An anti-reflective coating is provided.
- the above liquid composition may include the following aspects.
- - (B2) preferably contains silica.
- the silica preferably includes composite silica blackened with a colorant.
- - (B1) preferably contains carbon black.
- the viscosity at 25° C. is preferably 1 mPa ⁇ s or more and 30 mPa ⁇ s or less.
- the above antireflection film may include the following aspects. ⁇ The glossiness of the outermost surface of the surface on which the film is formed against incident light at an incident angle of 60° (hereinafter also simply referred to as “60° glossiness”) is less than 1%, and the glossiness against incident light at an incident angle of 85° (hereinafter also simply referred to as “85° glossiness”) is less than 5%, the reflectance for light with a wavelength of 550 nm (hereinafter simply referred to as "reflectance”) is less than 4%, and the CIELAB color system according to the SCE method is used. It is preferable that the L value is 22 or less and the optical density is 1.0 or more.
- the maximum height Rz (hereinafter simply referred to as "Rz") of the outermost surface of the surface on which the film is formed according to JIS B0601:2001 is 7 ⁇ m or more, and the average length Rsm of the contour curve elements (hereinafter simply “Rsm”) ) is 80 ⁇ m or more, the skewness Rsk (hereinafter also simply referred to as “Rsk”) of the contour curve is 0.3 or less, and the kurtosis Rku (hereinafter also simply referred to as “Rku”) of the contour curve is 3 or more, It is preferable that
- a fixture used for viewing objects such as a collection case, which is equipped with an anti-reflection film that is effective in enhancing the attractiveness of objects to be viewed and has a high design quality.
- FIG. 1 is a diagram showing a configuration example of a collection case as an example of a fixture according to the present invention.
- 2 is a sectional view of FIG. 1.
- FIG. FIG. 2 is a diagram illustrating an example of objects for viewing etc. stored in the case of FIG. 1;
- FIG. 4 is a cross-sectional view of FIG. 3;
- the upper limit value or lower limit value described in a certain numerical range may be replaced with the value shown in the Examples.
- the content rate or amount of each component in the composition refers to the content rate or amount of each component in the composition, unless otherwise specified. Means the total content rate or content of substances.
- a collection case 1 includes a bottom member (placing table) 2 on which an article G to be viewed (see FIGS. 3 and 4) is placed, and a bottom portion.
- the transparent cover 4 surrounds the article G placed on the material 2 in a transparent manner.
- the transparent cover 4 has a rectangular parallelepiped shape with a downward opening 4a, and has a storage chamber 4b inside.
- the transparent cover 4 can be detachably attached to the bottom member 2.
- the material of the bottom member 2 is not particularly limited, and is made of synthetic resin or the like.
- the transparent cover 4 may be made of, for example, a transparent synthetic resin (such as acrylic resin) that has a transparency that exceeds the light transmittance of glass and has excellent workability. When transparent resin is selected as the material of the transparent cover 4, the entire transparent cover 4 becomes transparent, and the visibility when looking through the article G placed thereon is increased, which is useful.
- the bottom member 2 is surrounded by the transparent cover 4, so that the article G can be seen through the transparent cover 4, but the present invention is not limited to this embodiment.
- the collection case 1 may be composed of only the bottom member 2 and may be put on display with the articles G exposed.
- a locking mechanism (not shown) for the bottom member 2 and the transparent cover 4 may be provided. Due to the locking mechanism, when the bottom member 2 is inserted into the opening 4a of the transparent cover 4 and the lid is unlocked and closed, the two (bottom member 2 and transparent cover 4) can be separated. When the lid is closed, the two cannot be separated.
- the transparent cover 4 may be configured to be able to be opened and closed in whole or in part in order to allow the article G to be taken in and taken out onto the bottom member 2.
- a black antireflection film 9 is provided on a part or all of the main surface of the bottom member 2 on which the article G is placed. Since it is on the "main surface side", the anti-reflection film 9 may be formed directly on the main surface of the bottom member 2 on which the article G is placed, or may be formed on any arbitrary surface between the bottom member 2 and the anti-reflection film 9. This includes an embodiment in which a layer (for example, a primer layer, etc.) is interposed therebetween. Since it is "a part or all", it includes a case where the antireflection film 9 is formed on a part of the main surface side of the bottom member 2 on which the article G is placed.
- the antireflection film 9 of this example is composed of a film formed from a liquid composition.
- the liquid composition (hereinafter also simply referred to as “composition”) according to one embodiment forms a film on the main surface side of the bottom member 2 (hereinafter also simply referred to as "object to be coated") on which the article G is placed. It contains (A) a resin component, (B) unevenness forming particles, and (C) a diluting solvent.
- (B) used for forming the composition is (B1) small particles with a particle size (d 1 ) of 0.05 ⁇ m or more and 0.4 ⁇ m or less, and (B2) large particles with a particle size (d 2 ) of 2 ⁇ m or more and 6 ⁇ m or less. particles, and may also contain components other than (B1) and (B2). That is, the composition according to one embodiment includes (A), (B1), (B2), and (C).
- spray coating can be suitably used.
- thermosetting resins include acrylic resins, urethane resins, phenol resins, melamine resins, urea resins, diallyl phthalate resins, unsaturated polyester resins, epoxy resins, and alkyd resins. It will be done.
- thermoplastic resin include polyacrylic ester resin, polyvinyl chloride resin, butyral resin, styrene-butadiene copolymer resin, and the like.
- thermosetting resin acrylic resin is particularly preferable in consideration of the flexibility and toughness of the formed film.
- (A) may be used alone or in combination of two or more.
- the content (total amount) of (A) is not particularly limited, but considering the blend balance with other components, preferably 5% by mass or more, based on the total solid content (100% by mass) of the composition.
- the content is more preferably 15% by mass or more, further preferably 25% by mass or more, and preferably 50% by mass or less, more preferably 45% by mass or less, and still more preferably 40% by mass or less.
- the particle diameter (d 2 ) of (B2) is the particle size of (B1).
- the diameter (d 1 ) is preferably 10 times or more, more preferably 15 times or more, preferably 40 times or less, and more preferably 35 times or less.
- the particle size (d max ) of the unevenness-forming particle having the maximum particle size and the particle size of the unevenness-forming particle having the minimum particle size has the above relationship (that is, (d max ) is preferably 10 times or more, more preferably 15 times or more, and preferably 40 times or less, more preferably 35 times or less) than (d min ). It should be adjusted so that
- (d 1 ) is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, and preferably 0.4 ⁇ m or less, more preferably 0.3 ⁇ m or less.
- (d 2 ) is preferably 2 ⁇ m or more, more preferably 3 ⁇ m or more, and preferably 6 ⁇ m or less, more preferably 5 ⁇ m or less, and still more preferably 4 ⁇ m or less.
- the particle diameter (d 1 ) of (B1) and the particle diameter (d 2 ) of (B2) are volume-based median diameters measured with a laser diffraction/scattering particle size distribution measuring device.
- the mass ratio of (B2) in (B) to (B1):1 is preferably greater than 1.75, more preferably greater than or equal to 1.8, and preferably less than 3.58; More preferably, it is 3.3 or less.
- this mass ratio range by using a combination of (B1) and (B2) having the above-mentioned specific particle size range, in the formed film, one (B1) between two adjacent (B2) The inventors have found that the film surface becomes more easily embedded, and as a result, it is possible to achieve low gloss and low reflectivity of the film surface, and the degree of blackness is increased (lower L value).
- the total content (total amount) of (B1) and (B2) in (B) is preferably 90% by mass or more, more preferably 95% by mass or more.
- the upper limit is not particularly limited and is 100% by mass. That is, in one embodiment, (B1) and (B2) should preferably be contained in an amount of 90% by mass or more in 100% by mass of (B).
- the content (total amount) of (B) is preferably 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, based on the total solid content (100% by mass) of the composition.
- the content is preferably 60% by mass or less, more preferably 50% by mass or less, further preferably 45% by mass or less, particularly preferably 40% by mass or less. If the total amount of (B) is less than 20% by mass, problems such as increased gloss and insufficient optical density will occur; if it exceeds 60% by mass, the amount of (A) in the formed coating will be relatively small, resulting in As a result, the inconvenience of the coating film falling off from the object to be coated may occur.
- resin particles or inorganic particles can be used.
- the resin particles include melamine resin, benzoguanamine resin, benzoguanamine/melamine/formalin condensate, acrylic resin, urethane resin, styrene resin, fluororesin, silicone resin, and the like.
- examples of inorganic particles include silica, alumina, calcium carbonate, barium sulfate, titanium oxide, and carbon. These may be used alone or in combination of two or more.
- inorganic particles for (B2).
- inorganic particles By using inorganic particles as (B2), it is easier to form a film with lower gloss and higher light shielding.
- Silica is preferred as the inorganic particles used as (B2).
- the shape of (B2) is not particularly limited, but in order to achieve further low gloss, low reflection, and low L value on the surface of the formed film, it is necessary to have a narrow particle size distribution (CV (Coefficient of Variation) value). For example, it is preferable to use 15 or less) particles (Sharp products).
- the CV value is a numerical representation of the degree of spread of particle size distribution (dispersion in particle size) with respect to the average value of particle sizes (arithmetic mean particle size).
- (B2) may be colored black with an organic or inorganic colorant in order to enhance the effect of preventing light reflection (so-called halation) on the surface of the formed film.
- organic or inorganic colorant examples include composite silica, conductive silica, black silica, and the like.
- composite silica include a compound obtained by synthesizing carbon black (hereinafter also simply referred to as "CB") and silica at the nano level.
- Examples of the conductive silica include silica particles coated with conductive particles such as CB.
- black silica include natural ores containing graphite in silica stone.
- the material of (B1) is not particularly limited, and either resin particles or inorganic particles can be used.
- the resin particles include melamine resin, benzoguanamine resin, benzoguanamine/melamine/formalin condensate, acrylic resin, urethane resin, styrene resin, fluororesin, silicone resin, and the like.
- examples of inorganic particles include silica, alumina, calcium carbonate, barium sulfate, titanium oxide, and CB. These may be used alone or in combination of two or more.
- CB or the like added as a coloring/conductive agent can also be used.
- CB as (B1), the formed film is colored, so that the antireflection effect is further improved and a good antistatic effect can be obtained.
- -(C)- (C) used to form the composition is blended for the purpose of dissolving (A) and adjusting the viscosity of the entire composition.
- (C) By using (C), (A) and other components added as needed become easier to mix, improving the uniformity of the composition. Further, the viscosity of the composition can be adjusted appropriately, and when forming a film on the surface of an object to be coated, it becomes possible to improve the operability of the composition and the uniformity of the coating thickness.
- (C) is not particularly limited as long as it is a solvent that can dissolve (A), and examples thereof include organic solvents and water.
- organic solvent for example, methyl ethyl ketone, toluene, propylene glycol monomethyl ether acetate, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, butanol, etc. can be used.
- (C) may be used alone or in combination of two or more.
- the content (total amount) of (C) in the composition is preferably 1 part by mass or more per 100 parts by mass of (A), in order to obtain the effect of the above-mentioned combination of (C). More preferably it is 3 parts by mass or more, preferably 20 parts by mass or less.
- composition may contain (D) to the extent that the effects of the present invention are not impaired.
- (D) include leveling agents, thickeners, pH adjusters, lubricants, dispersants, antifoaming agents, curing agents, and reaction catalysts.
- thermosetting resin when used as (A), crosslinking of (A) can be promoted by adding a curing agent.
- the curing agent include urea compounds, melamine compounds, isocyanate compounds, epoxy compounds, aziridine compounds, and oxazoline compounds having functional groups. Among these, isocyanate compounds are preferred as the curing agent.
- One type of curing agent may be used alone, or two or more types may be used in combination.
- the proportion of the curing agent in the composition is preferably 10 parts by mass or more and 80 parts by mass or less based on 100 parts by mass of (A).
- a curing agent By adding a curing agent within this range, the hardness of the formed film is increased, and as a result, even if the film is placed in an environment where it slides against other members, the properties of the film surface are maintained for a long period of time. Low gloss, high light shielding, low reflection, and high blackness are easily maintained.
- a reaction catalyst can also be used in combination to promote the reaction between (A) and the curing agent. Examples of the reaction catalyst include ammonia and ammonium chloride.
- the proportion of the reaction catalyst in the composition is preferably 0.1 parts by mass or more and 10 parts by mass or less, based on 100 parts by mass of the curing agent.
- the composition according to one embodiment preferably has a viscosity of 1 mPa at 25°C because it is applied using a spray (spray coating) while maintaining the smoothness of the composition on the surface of the object to be coated. s or more, preferably 30 mPa ⁇ s or less, more preferably 20 mPa ⁇ s or less. If the viscosity of the composition is too low, it may not be possible to form a film thick enough to sufficiently exhibit the effect of preventing the occurrence of halation. If the viscosity of the composition is too high, it will be difficult to spray the composition uniformly onto the surface of the object to be coated, and as a result, it may not be possible to form a film with a constant thickness and little variation in performance.
- the above viscosity varies depending on the components contained in the composition, that is, the types and molecular weights of (A) and (B) used, and also when (D) is blended in addition to the above (A) and (B). In this case, it can be easily adjusted by adjusting the amount of (C) in the composition within the above-mentioned range, although it varies depending on the type and molecular weight of (D).
- composition according to one embodiment of the present invention can be prepared (manufactured) by adding (A), (B), and (D) as necessary to (C), and mixing and stirring. .
- the order in which the components are mixed is not particularly limited, as long as these components are mixed uniformly.
- the composition according to one embodiment of the present invention may be of a one-part type or a two-part type.
- the composition according to one embodiment is, for example, a two-part type comprising a first liquid containing components other than the curing agent and a second liquid containing the curing agent. It may be.
- the method of forming the film is not particularly limited. Any spray coating (e.g. air spray, airless spray, electrostatic spray, etc.), paint brush, curtain flow coating, roller brush coating, bar coating, kiss roll, metaling bar, gravure roll, reverse roll, dip coating, die coating, etc.
- a film can be provided on a coated object by the method or apparatus.
- the composition according to one embodiment is preferably formed into a film by spray coating, which requires atomization of droplets through small spray holes.
- the film formed from the liquid composition according to one embodiment is a spray-painted film.
- droplets made of the composition adhere to the surface of the object to be coated one after another, and at the same time, the volatilization of (C) in the droplets adhering to the object to be coated occurs. move on.
- the solid content (grains) from which (C) has been removed from the droplets are piled up one after another on the surface of the object to be coated, forming a solid particle laminate.
- this solid particle laminate constitutes a membrane.
- thermosetting resin as (A) and a curing agent as (D)
- a solid particle laminate is attached to the surface of the object to be coated, and then the laminate is heated and cured. It is preferable to let At this time, even if (C) is contained in the laminate before heating, (C) is almost completely volatilized by this heating.
- the heating conditions may be adjusted as appropriate depending on the thickness of the laminate before heating, the heat resistance of the object to be coated, the type of (C) used, etc.
- the heating conditions are, for example, at 70° C. or higher and 150° C. or lower for 1 minute or more and 10 minutes or less, preferably at 100° C. or higher and 130° C. or lower for 2 minutes or more and 5 minutes or less.
- the thickness of the antireflection film 9 is not particularly limited as long as it has good adhesion strength to the bottom member 2 and can prevent the occurrence of halation on the surface on which the film is formed.
- An example of a suitable film thickness is preferably 2 ⁇ m or more, more preferably 5 ⁇ m or more, and preferably 40 ⁇ m or less, more preferably 25 ⁇ m or less.
- the thickness of the antireflection film 9 is the height including the portions of the film that protrude from the surface of the object to be coated due to (B2) and (B1).
- the film thickness can be measured by a method based on JIS K7130.
- the film formed from the composition according to one embodiment has a film surface with a 60° gloss of less than 1%, an 85° gloss of less than 5%, a reflectance of 4% or less, an L value of 22 or less, and an optical density. is preferably 1.0 or more.
- the film formed from the composition according to one form is exposed on the outermost surface, the 60° glossiness, 85° glossiness, reflectance, L value, and It is preferable that the optical density is within the above range.
- the surface of the other film i.e., the outermost surface of the bottom member 2
- the reflectance, L value, and optical density are within the above ranges.
- these surfaces will be collectively referred to as the "film outermost surface.”
- the film formed from the composition according to one embodiment has a 60° gloss of less than 1%, an 85° gloss of less than 5%, a reflectance of 4% or less, an L value of 22 or less, and an optical It is preferable that the concentration is 1.0 or more.
- the outermost surface of the film has low gloss, low reflectance (excellent antireflection properties) (the same applies hereinafter), high blackness, and high light-shielding properties can be achieved.
- the upper limit of the 60° glossiness is more preferably less than 0.8%, still more preferably less than 0.5%.
- the lower limit of the 60° glossiness is not particularly limited, and the lower the better.
- the upper limit of the 85° glossiness is more preferably less than 3.5%, even more preferably less than 2.5%.
- the upper limit of the reflectance is more preferably 3% or less, and even more preferably 2.5% or less.
- the lower limit of the reflectance is not particularly limited, and the lower the better.
- the upper limit of the L value (blackness) is more preferably 20 or less, and even more preferably 18 or less.
- the lower limit of the L value is not particularly limited, but from the viewpoint of seeking blacker appearance, the lower the value, the better.
- the above L value is the lightness L* value of the outermost surface of the film in the CIE 1976 L*a*b* (CIELAB) color system according to the SCE method.
- the SCE method is a method for removing specularly reflected light, and means a method of measuring color by removing specularly reflected light.
- CIE Commission Internationale de l'Eclairage
- CIELAB display color is a uniform color space recommended in 1976 and defined in JIS Z8781 (2013) in order to measure color differences due to differences in perception and equipment.
- the three coordinates of CIELAB are indicated by L* value, a* value, and b* value.
- the L* value indicates lightness and is expressed on a scale of 0 to 100.
- An L* value of 0 means black, and an L* value of 100 means white diffuse color.
- the a* value indicates a color between red and green. If the a* value is negative, it means a color closer to green, and if it is positive, it means a color closer to red.
- the b* value indicates a color between yellow and blue. If the b* value is negative, it means a color closer to blue, and if it is positive, it means a color closer to yellow.
- the lower limit of the optical density is more preferably 1.5 or more, and even more preferably 2.0 or more. By adjusting the optical density within the above range, the light blocking property can be further improved.
- the upper limit of the optical density is not particularly limited, and the higher it is, the better.
- the film formed from the composition preferably has good adhesion to the surface of the object to be coated.
- the adhesion of the film formed from the composition to the surface of the object to be coated is preferably such that the remaining coating film is 75% or more, as shown in the adhesion evaluation in Examples below.
- the film formed from the composition according to one embodiment has a maximum height Rz of the outermost surface of the film of 7 ⁇ m or more, an average length Rsm of contour curve elements of 80 ⁇ m or more, and a skewness Rsk of the contour curve of 0.3 or less. It is preferable that the kurtosis Rku of the contour curve is 3 or more.
- the glossiness, reflectance, L value, and optical density of the outermost surface of the film are within the above ranges (60° glossiness of less than 1%, 85° glossiness of less than 5%, reflectance of 4% or less, L value of 22 or less, optical density of 1.0 or more), resulting in low gloss, low reflectance, high blackness, and High light shielding properties can be achieved.
- the lower limit of Rz is more preferably 10 ⁇ m or more. By setting the lower limit of Rz to the above value, it becomes easier to adjust to lower gloss, lower reflectance, and higher light-shielding properties.
- the upper limit of Rz is not particularly limited, but is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less. By setting the upper limit of Rz to the above value, it is easy to achieve further low gloss, low reflectance, high blackness, and high light-shielding property of the outermost surface of the film.
- Rsm represents the average length of the contour curve element relative to the reference length.
- the lower limit of Rsm is more preferably 100 ⁇ m or more, still more preferably 120 ⁇ m or more. By setting the lower limit value of Rsm to the above value, it is easier to obtain the advantage of lower gloss.
- the upper limit of Rsm is not particularly limited, but is preferably 160 ⁇ m or less. Within the above range, better adhesion can be obtained between the object to be coated and the film formed thereon.
- Rsk represents the cube mean of the height Z(x) at the reference length, which is made dimensionless by the cube of the root mean square height (Zq), and represents the deviation of the uneven shape of the outermost surface of the film from the average line, that is, the degree of strain. This is an index that represents If the value of Rsk is positive (Rsk > 0), the uneven shape is biased toward the concave side and the protruding shape becomes sharp. If the value of Rsk is negative (Rsk ⁇ 0), the irregular shape is biased toward the convex side and the protruding shape becomes dull. This is the tendency. The haze is lower when the protruding shape of the contour curve is blunt than when it is sharp.
- the upper limit of Rsk is more preferably 0.2 or less.
- the lower limit value of Rsk is not particularly limited, but is preferably 0 or more. By setting the lower limit of Rsk to the above value, it is easy to obtain the advantage of low gloss.
- Rku represents the fourth root mean of the height Z(x) at the standard length, which is made dimensionless by the fourth power of the root mean square height (Zq), and is an index indicating the degree of sharpness at the tip of the unevenness on the outermost surface of the film. .
- the smaller Rku is, the more flat the tips of the uneven portions are, so the inclination angle of the tip portions of the uneven portions becomes smaller, which tends to cause the disadvantage of being reflected in the background.
- the lower limit of Rku is more preferably 3.3 or more. By setting the lower limit of Rku to the above value, it is easier to obtain the advantage of lower gloss.
- the upper limit of Rku is not particularly limited, but is preferably 5 or less. By setting the upper limit of Rku to the above value, it is easy to obtain the advantage of low gloss.
- the film formed from the composition according to one embodiment has an arithmetic mean roughness (Ra) of the outermost surface of the film, preferably 0.5 ⁇ m or more, more preferably 1.0 ⁇ m or more, even more preferably 1.5 ⁇ m or more, It is.
- Rz, Rsm, Rsk, Rku, and Ra of the outermost surface of the film described above can be measured and calculated based on JIS B0601:2001.
- the antireflection film 9 in the above embodiment can be formed directly on the main surface side of the bottom member 2 on which the article G is placed without any pretreatment or via a pretreatment layer, but is limited to this embodiment. Not done. For example, prepare an anti-reflection film sheet in which the anti-reflection film 9 is formed by spray painting on an extremely thin plastic film (such as PET film), and apply the sheet to the main surface of the bottom member 2 on which the article G is placed. After obtaining a sheet piece by cutting it to match the shape, the sheet piece is attached to the main surface side of the bottom member 2 on which the article G is placed via an adhesive layer, and finally, an antireflection film 9 is formed. It may also be an embodiment.
- composition [Components of the composition] The following were prepared as A (resin component).
- ⁇ A1 Thermosetting acrylic resin (Acridic A801, DIC Corporation, solid content 50%)
- B1 small particles belonging to B (irregularity forming particles).
- B1a Carbon black (CB) (particle size 150 nm) (MHI Black_#273, Mikuni Shikisha, CB content 9.5%)
- B1b Transparent silica (particle size 58 nm) (ACEMATT R972, EVONIK)
- B2a Composite silica (particle size 3 ⁇ m) (Vexia ID, Fuji Silysia Chemical Co., Ltd.)
- B2b Black acrylic beads (particle size 3 ⁇ m) (Love Color 224SMD Black, Dainichiseika Industries Co., Ltd.)
- ⁇ B2c Transparent silica (particle size 4.1 ⁇ m) (Silysia 430, Fuji Silysia Chemical Co., Ltd.)
- B2d Transparent silica (particle size 8 ⁇ m) (Silysia 450, Fuji Silysia Chemical Co., Ltd.)
- B2e Transparent acrylic beads (particle size 3 ⁇ m) (Unipowder NMB-0320C, ENEOS)
- MHI Black #273 used for B1a (CB) is a CB dispersion, and of the total solid content of 18% in the dispersion, 9.5% is CB and the remaining 8.5% is other compounds. Of the 8.5% of other compounds, 3% is a copper compound and 5.5% is an acrylic resin.
- a sample substrate for evaluation was prepared as an object to be coated.
- a rectangular polycarbonate flat plate 100 mm long, 50 mm wide, and 1.5 mm was used.
- evaluation sample The liquid agent obtained in each experimental example was sprayed onto one side of the object to be coated by spray coating using the same method as described in (3-1) Paintability below, and then heated and dried at 120°C for 3 minutes.
- An evaluation sample was obtained in which a heated coating film (hereinafter also simply referred to as a "coating film”) of solid particles laminated by spray coating was formed on the surface of the object to be coated, with an average film thickness of 20 ⁇ m.
- CM-5 Konica Minolta
- JIS Z8722 JIS Z8722
- ⁇ Reflectance is 3% or less (very good low reflectivity)
- ⁇ Reflectance is more than 3% and less than 4% (good low reflectivity)
- ⁇ Reflectance exceeds 4% (low reflectivity is insufficient)
- the blackness of the coating film surface formed on each evaluation sample is determined by measuring the lightness L* value of the coating film surface in the CIE 1976 L*a*b* (CIELAB) color system according to the SCE method. Evaluated by. The lightness L* value was measured using a spectrophotometer (CM-5: Konica Minolta) in accordance with JIS Z8781-4:2013. The evaluation criteria are as follows. In the measurement, the CIE standard light source D65 was used as a light source, the viewing angle was set to 10°, and the L* value was determined in CIELAB display colors using the SCE method.
- CIE standard illuminant D65 is defined in JIS Z8720 (2000) “Illuminite (standard light) and standard illuminant for colorimetry", and the same regulation is also found in ISO 10526 (2007).
- CIE standard illuminant D65 is used when displaying the color of an object illuminated by daylight. The viewing angle of 10° is defined in JIS Z8723 (2009) “Visual comparison method of surface color", and the same regulation is also in ISO/DIS 3668.
- ⁇ L value is 20 or less (blackness is extremely high)
- ⁇ L value is over 20 and 22 or less (high blackness)
- ⁇ L value exceeds 22 (blackness is insufficient)
- the light-shielding property of the coating film formed on each evaluation sample was evaluated by calculating the optical density of the coating film.
- the optical density of the coating film formed on each evaluation sample was determined using an optical densitometer (X-rite 361T (ortho filter): Nippon Heiban Kizai Co., Ltd.) by irradiating the coating film side of the sample with a vertically transmitted light flux. It was calculated by expressing the ratio with the state without a coating film in log (logarithm). An optical density of 6.0 or more is the upper limit of detection for measurement.
- the evaluation criteria are as follows.
- Optical density is 1.5 or more (extremely good light shielding property)
- Optical density is 1.0 or more and less than 1.5 (good light shielding property)
- Optical density is less than 1.0 (light shielding property is insufficient)
- the adhesion of the coating film formed on each evaluation sample to the surface of the object to be coated was determined by making cuts in the coating film in a grid pattern using a commercially available cutter knife, and then applying cellophane tape (Cello Tape, Nichiban Co., Ltd.) to the coating film. After pasting, it was peeled off and the remaining state of the coating film was visually confirmed for evaluation.
- the evaluation criteria are as follows.
- ⁇ All evaluations of gloss, reflectance, blackness, light shielding, and adhesion are ⁇ ⁇ : At least one of the evaluations of glossiness, reflectance, blackness, light-shielding property, and adhesion is ⁇ , and none of them are ⁇ . ⁇ : Glossiness, reflectance, blackness, light-shielding property, and adhesion At least one of each rating is ⁇
- Rz is 10 ⁇ m or more (extremely good) ⁇ : Rz is 7 ⁇ m or more and less than 10 ⁇ m (good) ⁇ : Rz is less than 7 ⁇ m (defective)
- Rku (Rku) ⁇ : Rku is 3.3 or more (extremely good) ⁇ : Rku is 3 or more and less than 3.3 (good) ⁇ : Rku is less than 3 (defective)
- Ra Ra is 1.5 ⁇ m or more (extremely good) ⁇ : Ra is 0.5 ⁇ m or more and less than 1.5 ⁇ m (good) ⁇ : Ra is less than 0.5 ⁇ m (defective)
- the mass ratio range of (B2) to (B1):1 is more than 1.75 and less than 3.58, and the total content of (B) is 20 mass% with respect to 100 mass% of the total solid content of the composition. % or more and 60% by mass or less (Experimental Examples 2 to 4, 8, 10, 14 to 16), it was possible to satisfy all of the coating properties of the liquid, film properties, and film properties.
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Abstract
Description
・所定の粒子径範囲を有する大小の無機系粒子を所定の質量比範囲で含む凹凸形成粒子を所定割合で含む、特定組成の液剤組成物を用いる。
・上記特定組成の液剤組成物を用い、スプレー塗装で所定厚みの膜を形成する。
本発明者は、こうした新たな知見に基づき、以下に提供される発明を完成させ、上記課題を解決した。
物品の鑑賞等に用いる什器において、物品を載置する載置台を少なくとも備え、
載置台は、物品を載置する主面側に黒色の反射防止膜を有し、
反射防止膜は、液剤組成物から形成されたスプレー塗装による、厚さが2μm以上40μm以下の膜からなり、
液剤組成物は、(A)、(B)、及び(C)を少なくとも含み、
(B)は、組成物の全固形分の総量100質量%中に、20質量%以上60質量%以下で含有され、
(B)は、(B1)及び(B2)を90質量%以上含み、(B1):1に対する(B2)の質量比が1.8以上3.3以下である、
什器
が提供される。
物品の鑑賞等に用いる什器の、物品を載置する載置台に形成される黒色の反射防止膜であって、
液剤組成物から形成されたスプレー塗装による、厚さが2μm以上40μm以下の膜からなり、
液剤組成物は、(A)、(B)、及び(C)を少なくとも含み、
(B)は、組成物の全固形分の総量100質量%中に、20質量%以上60質量%以下で含有され、
(B)は、(B1)及び(B2)を90質量%以上含み、(B1):1に対する(B2)の質量比が1.8以上3.3以下である、
反射防止膜
が提供される。
・(B2)は、シリカを含むことが好ましい。
・シリカは、着色剤によって黒色化した複合シリカを含むことが好ましい。
・(B1)は、カーボンブラックを含むことが好ましい。
・25℃における粘度が1mPa・s以上30mPa・s以下であることが好ましい。
・膜が形成された面の最表面の、入射角度60°の入射光に対する光沢度(以下単に「60°光沢度」ともいう。)が1%未満、入射角度85°の入射光に対する光沢度(以下単に「85°光沢度」ともいう。)が5%未満、波長550nmの光に対する反射率(以下単に「反射率」ともいう。)が4%以下、SCE方式によるCIELAB表色系でのL値が22以下で、かつ光学濃度が1.0以上、であることが好ましい。
・膜が形成された面の最表面の、JIS B0601:2001における最大高さRz(以下単に「Rz」ともいう。)が7μm以上、輪郭曲線要素の長さの平均Rsm(以下単に「Rsm」ともいう。)は80μm以上、輪郭曲線のスキューネスRsk(以下単に「Rsk」ともいう。)が0.3以下で、かつ輪郭曲線のクルトシスRku(以下単に「Rku」ともいう。)が3以上、であることが好ましい。
本明細書において組成物中の各成分の含有率又は含有量は、組成物中に各成分に該当する物質が複数種存在する場合、特に断らない限り、組成物中に存在する当該複数種の物質の合計の含有率又は含有量を意味する。
コレクションケース1が透明カバー4を含む場合、底部材2と透明カバー4の施錠機構(不図示)が設けられていてもよい。施錠機構によって、透明カバー4の開口部4aに底部材2を嵌入した非ロックの閉蓋状態では両者(底部材2と透明カバー4)は分離可能となるが、両者を任意の方式でロックの閉蓋状態にした場合、両者は分離不能とされる。コレクションケース1が透明カバー4を含む場合、透明カバー4は、底部材2の上へ物品Gを出し入れ可能とするため、その全部又は一部を開閉できるよう構成されていてもよい。
本例において、底部材2の、物品Gを載置する主面側の、一部又は全部には、黒色の反射防止膜9が設けてある。「主面側」であるから、反射防止膜9は、底部材2の物品Gを載置する主面に直接形成される態様の他、底部材2と反射防止膜9との間に任意の層(例えばプライマー層等)が介在させた上で形成される態様を含む。「一部又は全部」であるから、反射防止膜9は、底部材2の物品Gを載置する主面側の一部に形成される場合を含む。
一形態に係る液剤組成物(以下単に「組成物」ともいう。)は、底部材2(以下単に「被塗物」ともいう。)の物品Gを載置する主面側に膜を形成するために使用され、(A)樹脂成分、(B)凹凸形成粒子、及び(C)希釈溶媒、を含む。組成物の形成に用いる(B)は、(B1)粒子径(d1)が0.05μm以上0.4μm以下の小粒子、及び(B2)粒子径(d2)が2μm以上6μm以下の大粒子、を含み、かつ(B1)及び(B2)以外の成分を含むことはあり得る。すなわち、一形態に係る組成物は、(A)、(B1)、(B2)、及び(C)を含んで構成される。一形態に係る組成物は、被塗物表面に塗布するに際し、スプレー塗装を好適に使用することができる。
組成物の形成に用いる(A)は、(B)のバインダーとなる。(A)の材料は特に限定されず、熱可塑性樹脂及び熱硬化性樹脂のいずれを用いることもできる。熱硬化性樹脂としては、例えば、アクリル系樹脂、ウレタン系樹脂、フェノール系樹脂、メラミン系樹脂、尿素系樹脂、ジアリルフタレート系樹脂、不飽和ポリエステル系樹脂、エポキシ系樹脂、アルキド系樹脂等が挙げられる。熱可塑性樹脂としては、ポリアクリルエステル樹脂、ポリ塩化ビニル樹脂、ブチラール樹脂、スチレン-ブタジエン共重合体樹脂等が挙げられる。形成される凹凸膜の、耐熱性、耐湿性、耐溶剤性及び表面硬度の観点からは、(A)として熱硬化性樹脂を用いることが好ましい。熱硬化性樹脂としては、形成される膜の柔軟性及び強靭さを考慮すると、アクリル樹脂が特に好ましい。(A)は、1種を単独で用いてもよいし、2種以上を組み合わせて用いてもよい。
(A)の含有量(総量)は特に限定されないが、他の成分との配合バランスを考慮すると、組成物の全固形分の総量(100質量%)に対して、好ましくは5質量%以上、より好ましくは15質量%以上、さらに好ましくは25質量%以上、また好ましくは50質量%以下、より好ましくは45質量%以下、さらに好ましくは40質量%以下、である。
組成物の形成に用いる(B)は、大きさの異なる凹凸形成粒子を複数、組み合わせてなることが必須であり、(B)として特に、(B1)小粒子と、(B2)大粒子と、を組み合わせて使用する。例えば、(B)を、大きさの異なる凹凸形成粒子の2種類のみ(すなわち(B1)及び(B2))で構成する場合、(B2)の粒子径(d2)は、(B1)の粒子径(d1)の、好ましくは10倍以上、より好ましくは15倍以上、好ましくは40倍以下、より好ましくは35倍以下、である。(B)として、大きさの異なる凹凸形成粒子を3種類以上用いる場合、粒子径が最大値を示す凹凸形成粒子の粒子径(dmax)と、粒子径が最小値を示す凹凸形成粒子の粒子径(dmin)とが、上記関係(すなわち(dmax)が(dmin)の、好ましくは10倍以上、より好ましくは15倍以上、また好ましくは40倍以下、より好ましくは35倍以下)となるよう調整すればよい。
(B1)の粒子径(d1)及び(B2)の粒子径(d2)は、レーザー回折/散乱式粒子径分布測定装置で測定される、体積基準のメジアン径である。
また、形成される膜表面の光沢度をより低減するためには、(B2)として、不定形の粒子を用いることが好ましい。これらの中でも、(B2)として、特に多孔質の不定形シリカ粒子を用いることが好ましい。(B2)としてこのような粒子を用いることにより、膜となったとき、(B2)の表面及び内部で光が屈折を繰り返すことにより、膜表面の光沢度をさらに低減することができる。
複合シリカとしては、例えば、カーボンブラック(以下単に「CB」ともいう。)とシリカをナノレベルで合成し複合化したものが挙げられる。導電性シリカとしては、例えば、シリカ粒子にCB等の導電性粒子をコーティングしたものが挙げられる。黒色シリカとしては、例えば、珪石の中に黒鉛を含有している天然鉱石が挙げられる。
組成物の形成に用いる(C)は、(A)を溶解し、また、該組成物全体の粘度を調整する目的で、配合される。(C)を使用することにより、(A)、さらには、必要に応じて添加されるその他の成分が混合しやすくなり、組成物の均一性を向上させる。また、組成物の粘度を適度に調整することができ、被塗物の表面に膜を形成するときの、組成物の操作性及び塗布厚の均一性を高くすることが可能となる。
組成物には、上記成分((A)、(B)、(C))以外に、本発明の効果を損なわない程度に、(D)が含まれていてもよい。(D)としては、例えば、レベリング剤、増粘剤、pH調整剤、潤滑剤、分散剤、消泡剤、硬化剤、反応触媒等が挙げられる。
組成物中に硬化剤を配合する場合の割合は、(A)100質量部に対して、好ましくは10質量部以上80質量部以下、である。この範囲で硬化剤を添加することにより、形成される膜硬度が高められ、その結果、該膜が他部材と摺動する環境に置かれても、長期に渡り膜表面の性状が維持され、低光沢、高遮光、低反射及び高い黒色度が保持されやすい。
組成物中に硬化剤を配合する場合、(A)と硬化剤の反応を促進するために、反応触媒を併用することもできる。反応触媒としては、例えば、アンモニアや塩化アンモニウム等が挙げられる。組成物中に反応触媒を配合する場合の割合は、硬化剤100質量部に対し、好ましくは0.1質量部以上10質量部以下、である。
上記粘度は、組成物に含まれる成分、即ち、用いた(A)、(B)の種類や分子量等によって異なり、また、上記(A)、(B)の他に、(D)を配合した場合、(D)の種類や分子量等によっても異なるが、組成物中の(C)の量を上述の範囲で調整することにより、容易に調整することができる。
一形態に係る組成物を用いたスプレー塗装によると、組成物からなる液滴が被塗物表面に次々と付着し、それと同時に、被塗物に付着した液滴中の(C)の揮発が進む。その結果、液滴から(C)が除去された固形分(粒)が被塗物表面に次々と積み重なり、固形粒積層物を形成する。一形態によると、この固形粒積層物が膜を構成する。
加熱条件は、加熱前積層物の厚みや被塗物の耐熱性、使用する(C)の種類等により適宜調整すればよい。加熱条件は、一例として、70℃以上150℃以下で1分間以上10分間以下、好ましくは100℃以上130℃以下で2分間以上5分間以下、である。
なお、反射防止膜9の膜厚は、被塗物表面から膜の(B2)及び(B1)により突出している部分を含む高さのことである。膜厚は、JIS K7130に準拠した方法で測定することができる。
一形態に係る組成物から形成される膜の特性は、以下のとおりである。
一形態に係る組成物から形成される膜は、膜表面の、60°光沢度が1%未満、85°光沢度が5%未満、反射率が4%以下、L値が22以下、光学濃度が1.0以上、であることが好ましい。
85°光沢度の上限値は、より好ましくは3.5%未満、さらに好ましくは2.5%未満、である。85°光沢度を上記範囲に調整することにより、角度依存性が無くなり、高角度から見ても物品の魅力を引き立てる(高角度からも背景への映り込みを防止するため物品の魅力が引き立つ)メリットが得られやすい。85°光沢度の下限値は、特に限定されず、低ければ低いほどよい。
上記L値は、膜最表面の、SCE方式による、CIE 1976 L*a*b*(CIELAB) 表色系での明度L*値のことである。SCE方式とは、正反射光除去方式のことであり、正反射光を除去して色を測定する方法を意味する。SCE方式の定義は、JIS Z8722(2009)に規定されている。SCE方式では、正反射光を除去して測定するため、実際の人の目で見た色に近い色となる。
CIEは、Commission Internationale de l’Eclairageの略称であり、国際照明委員会を意味する。CIELAB表示色は、知覚と装置の違いによる色差を測定するために、1976年に勧告され、JIS Z8781(2013)に規定されている均等色空間である。CIELABの3つの座標は、L*値、a*値、b*値で示される。L*値は明度を示し、0~100で示される。L*値が0の場合は黒色を意味し、L*値が100の場合は白の拡散色を意味する。a*値は赤と緑の間の色を示す。a*値がマイナスであれば、緑寄りの色を意味し、プラスであれば赤寄りの色を意味する。b*値は黄色と青色の間の色を示す。b*値がマイナスであれば青寄りの色を意味し、プラスであれば、黄色寄りの色を意味する。
上記特性(光沢度、反射率、L値、光学濃度)に加え、組成物から形成される膜は、さらに、該膜の被塗物表面への密着性が良好であることが好ましい。組成物から形成される膜の、被塗物表面への密着性は、後述の実施例における密着性評価で示すように、塗膜残存が75%以上、が好ましい。
一形態に係る組成物から形成される膜は、膜最表面の、最大高さRzが7μm以上、輪郭曲線要素の長さの平均Rsmが80μm以上、輪郭曲線のスキューネスRskが0.3以下、輪郭曲線のクルトシスRkuが3以上、であることが好ましい。膜最表面の、Rz、Rsm、Rsk、及びRkuが上記範囲であることにより、膜最表面の、光沢度、反射率、L値、及び光学濃度を上記範囲(60°光沢度1%未満、85°光沢度5%未満、反射率4%以下、L値22以下、光学濃度1.0以上)にでき、その結果、膜最表面の、低光沢性、低反射率、高い黒色度、及び高遮光性を実現することができる。
Rzの上限値は特に限定されないが、好ましくは50μm以下、より好ましくは30μm以下、である。Rzの上限値を上記値にすることにより、膜最表面のさらなる低光沢性、低反射率、高い黒色度、及び高遮光性を実現させやすい。
Rskの上限値は、より好ましくは0.2以下、である。Rskの上限値を上記値にすることにより、さらに低光沢のメリットが得られやすい。Rskの下限値は特に限定されないが、好ましくは0以上、である。Rskの下限値を上記値にすることにより、低光沢のメリットが得られやすい。
Rkuの下限値は、より好ましくは3.3以上、である。Rkuの下限値を上記値にすることにより、さらに低光沢のメリットが得られやすい。Rkuの上限値は特に限定されないが、好ましくは5以下、である。Rkuの上限値を上記値にすることにより、低光沢のメリットが得られやすい。
上記の一形態における反射防止膜9は、底部材2の物品Gを載置する主面側に下処理なしに直接、又は下処理層を介して形成されることができるが、この態様に限定されない。例えば、極薄のプラスチックフィルム(PETフィルム等)上にスプレー塗装によって反射防止膜9を形成した反射防止膜用シートを準備し、そのシートを底部材2の物品Gを載置する主面側の形状に合うようカットしてシート片を得た後、そのシート片を粘着層を介して底部材2の物品Gを載置する主面側に貼り付け、最終的に、反射防止膜9を形成する態様であってもよい。
A(樹脂成分)として、以下のものを準備した。
・A1: 熱硬化性アクリル樹脂
(アクリディックA801、DIC社、固形分50%)
・B1a: カーボンブラック(CB)(粒子径150nm)
(MHIブラック_#273、御国色素社、CB含有量9.5%)
・B1b: 透明シリカ(粒子径58nm)
(ACEMATT R972、EVONIK社)
・B2a: 複合シリカ(粒子径3μm)
(ベクシアID、富士シリシア化学社)
・B2b: 黒色アクリルビーズ(粒子径3μm)
(ラブコロール224SMDブラック、大日精化工業社)
・B2c: 透明シリカ(粒子径4.1μm)
(サイリシア430、富士シリシア化学社)
・B2d: 透明シリカ(粒子径8μm)
(サイリシア450、富士シリシア化学社)
・B2e: 透明アクリルビーズ(粒子径3μm)
(ユニパウダーNMB-0320C、ENEOS社)
・D1: イソシアネート化合物
(タケネートD110N、三井化学社、固形分75%)
被塗物として、評価用サンプルの基板を準備した。評価用サンプルの基板として、黒色ポリカーボネート製のシート材を用い、厚さ(X)方向の板面を両面とも艶消し面に仕上げて作製した矩形のポリカーボネート製平板(縦100mm、横50mm、厚さ1.5mm)を用いた。
1.組成物の作製
表1に示す固形分比となるよう実験例ごとの各成分を、総固形分約25質量%となるよう、(C)希釈溶媒としての必要量の混合溶媒(メチルエチルケトン:酢酸ブチル=50:50)中に入れ、攪拌混合することにより液剤組成物(以下単に「液剤」ともいう。)を調製した。
各実験例で得られた液剤を、下記(3-1)塗装性と同様の手法によるスプレー塗装によって、被塗物の片面に向けて噴霧した後、120℃で3分間加熱乾燥することにより、被塗物の表面に、平均膜厚が20μmの、スプレー塗装による固形粒積層の加熱後塗膜(以下単に「塗膜」ともいう。)が形成された評価用サンプルを得た。
各実験例で得られた液剤について、下記に示す方法で各種特性(塗装性)を評価した(液剤評価)。また、各実験例で得られた評価用サンプルに形成された塗膜について、下記に示す方法で各種特性(特性、表面性状)を評価した(サンプル評価)。結果を表1に示す。
(3-1)塗装性
液剤の塗装性は、スプレー塗装による塗装後の塗りムラを観察することにより評価した。
エアー缶(スプレーワークエアーカン420D:タミヤ社)にエアーブラシ(スプレーワークHGシングルエアーブラシ:タミヤ社)を取り付けたエアスプレーを準備し、これに各液剤を注入した。そして、エアーブラシ先端から10cmの距離から、10秒間、被塗物の外表面に向けて噴霧し、形成された固形粒積層物について、目視により塗りムラを評価した。評価基準は、以下のとおりである。
△:塗りムラが一部、確認された
×:塗りムラが多くの範囲に確認された
(3-2)特性
-光沢度-
各評価用サンプルに形成された塗膜表面の、入射角60°の測定光に対する光沢度(60°鏡面光沢度)と入射角85°の測定光に対する光沢度(85°鏡面光沢度)は、ともに、グロスメータ(VG 7000:日本電色工業社)を用い、JIS Z8741に準拠した方法で光沢度9点測定し、その平均値を光沢度とした。評価基準は、以下のとおりである。
◎:0.8%未満(非常に優れている)
〇:0.8%以上1%未満(優れている)
×:1%以上(不十分)
◎:3.5%未満(非常に優れている)
〇:3.5%以上5%未満(優れている)
×:5%以上(不十分)
◎:60°鏡面光沢度と85°鏡面光沢度の各評価が全て◎(低光沢性が極めて良好)
〇:60°鏡面光沢度と85°鏡面光沢度の各評価の少なくとも1つが〇で、いずれも×でない(低光沢性が良好)
×:60°鏡面光沢度と85°鏡面光沢度の各評価の少なくとも1つが×(低光沢性が不十分)
各評価用サンプルに形成された塗膜表面の、波長400nmから700nmまでの光に対する反射率を、分光測色計(CM-5:コニカミノルタ社)を用い、JIS Z8722に準拠した方法で、1nm間隔で9点測定し、その測定結果の平均値を反射率とした。評価基準は、以下のとおりである。
〇:反射率が3%を超え4%以下(低反射性が良好)
×:反射率が4%超え(低反射性が不十分)
各評価用サンプルに形成された塗膜表面の黒色度は、該塗膜表面の、SCE方式による、CIE 1976 L*a*b*(CIELAB)表色系での明度L*値を測定することにより評価した。その明度L*値は、分光測色計(CM-5:コニカミノルタ社)を用い、JIS Z8781-4:2013に準拠した方法で測定した。評価基準は、以下のとおりである。
測定においては、光源としてCIE標準光源D65を用い、視野角度10°として、SCE方式によりCIELAB表示色でL*値を求めた。CIE標準光源D65は、JIS Z8720(2000)「測色用イルミナイト(標準の光)及び標準光源」に規定されており、ISO 10526(2007)にも同じ規定がある。CIE標準光源D65は、昼光で照明される物体色を表示する場合に使用される。視野角度10°については、JIS Z8723(2009)「表面色の視覚比較方法」に規定されており、ISO/DIS 3668にも同じ規定がある。
〇:L値が20を超え22以下(黒色度が高い)
×:L値が22超え(黒色度が不十分)
各評価用サンプルに形成された塗膜の遮光性は、該塗膜の光学濃度を算出することにより評価した。各評価用サンプルに形成された塗膜の光学濃度は、光学濃度計(X-rite 361T(オルソフィルタ):日本平板機材社)を用い、サンプルの塗膜側に垂直透過光束を照射して、塗膜がない状態との比をlog(対数)で表して算出した。光学濃度6.0以上は測定の検出上限値である。評価基準は、以下のとおりである。
〇:光学濃度が1.0以上1.5未満(遮光性が良好)
×:光学濃度が1.0未満(遮光性が不十分)
各評価用サンプルに形成された塗膜の被塗物表面への密着性は、該塗膜に市販のカッターナイフにて切り込みを碁盤目状に入れ、そこにセロハンテープ(セロテープ、ニチバン社)を貼り付けた後引き剥がし、塗膜の残存状態を目視にて確認することにより評価した。評価基準は、以下のとおりである。
〇:塗膜残存が75%以上100%未満(密着性が高い)
×:塗膜残存が75%未満(密着性が不十分)
上記光沢度、反射率、黒色度、遮光性、及び密着性を総合評価した。評価基準は、以下のとおりである。
〇:光沢度、反射率、黒色度、遮光性、及び密着性の各評価のうち少なくとも1つが〇で、いずれも×でない
×:光沢度、反射率、黒色度、遮光性、及び密着性の各評価のうち少なくとも1つが×
-Rz値、Rsm値、Rsk値、Rku値、Ra値-
各評価用サンプルに形成された塗膜表面の性状(Rz値、Rsm値、Rsk値、Rku値、Ra値)は、表面粗さ測定機(SURFCOM 480B、東京精密社)を用い、JIS B0601:2001に準拠した方法で測定した。評価基準は、以下のとおりである。
◎:Rzが10μm以上(極めて良好)
〇:Rzが7μm以上10μm未満(良好)
×:Rzが7μm未満(不良)
◎:Rsmが120μm以上(極めて良好)
〇:Rsmが80μm以上120μm未満(良好)
×:Rsmが80μm未満(不良)
◎:Rskが0.2以下(極めて良好)
〇:Rskが0.2を超え0.3以下(良好)
×:Rskが0.3超え(不良)
◎:Rkuが3.3以上(極めて良好)
〇:Rkuが3以上3.3未満(良好)
×:Rkuが3未満(不良)
◎:Raが1.5μm以上(極めて良好)
〇:Raが0.5μm以上1.5μm未満(良好)
×:Raが0.5μm未満(不良)
表1で示すように、膜形成用の液剤中に(B)として(B1)と(B2)の1つ以上を含めなかった場合(実験例6、7、9、11、12)、膜特性の、光沢度、反射率、L値、遮光性、密着性の1つ以上、を満足させることができなかった。一方、(B)として(B1)と(B2)の双方を液剤中に含めたとしても(実験例1~5、8、10)、(B1):1に対する(B2)の質量比が、1.75以下(実験例1)か、3.58以上(実験例5)であると、膜特性の、L値、密着性の1つ以上、を満足させることができなかった。(B1)と(B2)の双方を含め、かつ(B1):1に対する(B2)の質量比範囲が適切(1.75超3.58未満)であっても(実験例2~4、13~17)、全固形分100質量%中の(B)含有量(総量)が20質量%未満(実験例13)か、60質量%超(実験例17)であると、膜特性の、光沢度、反射率、L値、遮光性、密着性、の1つ以上を満足させることができなかった。
これに対し、(B1):1に対する(B2)の質量比範囲が1.75超3.58未満であり、かつ組成物の全固形分総量100質量%に対する(B)の含有総量が20質量%以上60質量%以下であると(実験例2~4、8、10、14~16)、液剤の塗装性、並びに、膜特性、及び膜性状、のすべてを満足させることができた。
2… 底部材(載置台)
4… 透明カバー
9… 反射防止膜
G… 物品(鑑賞等の対象)
Claims (8)
- 物品の鑑賞等に用いる什器において、物品を載置する載置台を少なくとも備え、
載置台は、物品を載置する主面側に黒色の反射防止膜を有し、
反射防止膜は、液剤組成物から形成されたスプレー塗装による、厚さが2μm以上40μm以下の膜からなり、
液剤組成物は、(A)、(B)、及び(C)を少なくとも含み、
(B)は、組成物の全固形分の総量100質量%中に、20質量%以上60質量%以下で含有され、
(B)は、(B1)及び(B2)を90質量%以上含み、(B1):1に対する(B2)の質量比が1.8以上3.3以下である、什器。
(A)樹脂成分
(B)凹凸形成粒子
(B1)粒子径(d1)が0.05μm以上0.4μm以下の無機系小粒子
(B2)粒子径(d2)が2μm以上6μm以下の無機系大粒子
(C)希釈溶媒 - (B2)はシリカを含む、請求項1に記載の什器。
- シリカは、着色剤によって黒色化した複合シリカを含む、請求項2に記載の什器。
- (B1)はカーボンブラックを含む、請求項1~3のいずれかに記載の什器。
- 膜が形成された面の最表面の、入射角度60°の入射光に対する光沢度が1%未満、入射角度85°の入射光に対する光沢度が5%未満、波長550nmの光に対する反射率が4%以下、SCE方式によるCIELAB表色系でのL値が22以下で、かつ光学濃度が1.0以上、である請求項1~4のいずれかに記載の什器。
- 膜が形成された面の最表面の、JIS B0601:2001における最大高さRzが7μm以上、輪郭曲線要素の長さの平均Rsmは80μm以上、輪郭曲線のスキューネスRskが0.3以下で、かつ輪郭曲線のクルトシスRkuが3以上、である請求項5に記載の什器。
- 載置台に載置される物品を透視可能に囲繞する透明カバーをさらに備えた、請求項1~6のいずれかに記載の什器。
- 物品の鑑賞等に用いる什器の、物品を載置する載置台に形成される黒色の反射防止膜であって、
液剤組成物から形成されたスプレー塗装による、厚さが2μm以上40μm以下の膜からなり、
液剤組成物は、(A)、(B)、及び(C)を少なくとも含み、
(B)は、組成物の全固形分の総量100質量%中に、20質量%以上60質量%以下で含有され、
(B)は、(B1)及び(B2)を90質量%以上含み、(B1):1に対する(B2)の質量比が1.8以上3.3以下である、反射防止膜。
(A)樹脂成分
(B)凹凸形成粒子
(B1)粒子径(d1)が0.05μm以上0.4μm以下の無機系小粒子
(B2)粒子径(d2)が2μm以上6μm以下の無機系大粒子
(C)希釈溶媒
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| JP2012200369A (ja) * | 2011-03-24 | 2012-10-22 | Solidstage:Kk | ショーケース |
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| TWI853437B (zh) | 2024-08-21 |
| US20240268577A1 (en) | 2024-08-15 |
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| CN117940043A (zh) | 2024-04-26 |
| US12419443B2 (en) | 2025-09-23 |
| KR102740621B1 (ko) | 2024-12-10 |
| TW202342192A (zh) | 2023-11-01 |
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