Standard sample for tactile quantitative analysis, method for manufacturing the same, and tactile quantitative analysis method

Abstract

To provide a standard sample for tactile quantitative analysis which can quantitatively analyze a tactile, a method for manufacturing the same, and a tactile quantitative analysis method.SOLUTION: A standard sample for tactile quantitative analysis is a standard sample for tactile quantitative analysis for quantitatively analyzing tactile of a measurement object using a device for measuring tactile. The standard sample for tactile quantitative analysis has a base material, and a layer formed of a binder resin composition. The binder resin composition contains at least one selected from the group consisting of a binder resin, organic beads and inorganic beads.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a standard sample for tactile quantitative analysis, a method for manufacturing the same, and a tactile quantitative analysis method.

Background Art

[0002] Although "tactile sense" is the most fundamental among the five senses consisting of vision, hearing, smell, and taste, it does not have a typical sensory organ, and the entire skin serves as the sensory organ. In addition, there are sensations inside the human body that are different from the skin, such as those in muscles and joints. This is the "tactile sense" in the broadest sense, called "somatosensation". Usually, "tactile sense" refers to the "narrow tactile sense" limited to skin sensation. That is, it is the primitive perceptual sensibility when touching something, and it is said that this can be expressed in five dimensions: the hardness, micro-roughness, macro-roughness, friction, and warm / cold sensation of the object (Non-Patent Document 1). For example, it is expressed by words such as soft, smooth, and cold. The roughness is divided into micro-roughness and macro-roughness. Macro-roughness is something like a bed of nails where the roughness can be known just by touching, and micro-roughness is something like fine-grained paper or sandpaper where the roughness cannot be felt without tracing it. In addition, Patent Document 1 describes a method for hierarchically analyzing sensory words, but these primitive perceptual sensory words are placed in the lower layer, and higher-order sensory words for humans such as moist, fluffy, and high-class feeling are placed in the upper layer for analysis. Devices for measuring such "tactile sense" have been developed, and research on measuring tactile sense has been conducted. For example, a tactile sensor that reads the displacement and force of the part touched by the sensor has been reported. This tactile sensor is mainly mounted on a robot, and it is expected that the robot will be used for medical care, nursing care, and logistics applications (Non-Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004] [Non-Patent Document 1] Shogo Okamoto et.al., Psychophysical Dimensions of Tactile Perception of Textures, IEEE Transactions on Haptics, 2013, vol.6, pages 81-93。 [Non-Patent Document 2] Akinori Takeuchi: Application of Tactile Sensors to the Medical Field, Journal of the Welding Society, 2006, Vol. 75, No. 4, p.230-233. [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] However, in order to ensure that a tactile measurement device such as a tactile sensor accurately reads the tactile sensation of a measurement object, verification and calibration using a standard sample are necessary.

[0006] As a result of intensive studies by the present inventors, it is possible to create such a standard sample by using a binder resin composition containing organic beads / inorganic beads. That is, an object of the present invention is to provide a standard sample for tactile quantitative analysis that can quantitatively analyze touch, a method for manufacturing the same, and a tactile quantitative analysis method. [Means for Solving the Problems]

[0007] This embodiment is based on the above findings by the present embodiment persons, and the means for solving the above problems are as follows. [1] A standard sample for tactile quantitative analysis for quantitatively analyzing the tactile sensation of a measurement object using a device for measuring tactile sensation, wherein the standard sample for tactile quantitative analysis has a base material and a layer formed of a binder resin composition, and the binder resin composition includes a binder resin and at least one selected from the group consisting of organic beads and inorganic beads, a standard sample for tactile quantitative analysis. [2] The standard sample for tactile quantitative analysis according to [1], wherein the binder resin is at least one selected from the group consisting of acrylate compounds. [3] The standard sample for tactile quantitative analysis according to [1] or [2], wherein at least one selected from the group consisting of the organic beads and the inorganic beads is composed of at least one selected from the group consisting of urethane resin, acrylic resin, nylon resin, and silicon dioxide. [4] The standard sample for tactile quantitative analysis according to any one of [1] to [3], wherein at least one selected from the group consisting of the organic beads and the inorganic beads has a Young's modulus of 0.1 MPa to 100 GPa. [5] The standard sample for tactile quantitative analysis according to any one of [1] to [4], which is prepared by applying the binder resin composition to the substrate or by spray coating. [6] The standard sample for tactile quantitative analysis according to any one of [1] to [5], wherein the tactile sense targets micro-roughness and friction among the tactile senses. [7] The standard sample for tactile quantitative analysis according to any one of [1] to [6], wherein the arithmetic mean roughness Ra or the arithmetic mean height Sa of the surface is 15 μm or less. [8] A method for manufacturing a standard sample for tactile quantitative analysis according to any one of [1] to [7], comprising: a step of applying the binder resin composition on at least one surface of the substrate; a step of curing the binder resin composition applied to the substrate; and having a method for manufacturing a standard sample for tactile quantitative analysis. [9] A tactile quantitative analysis method for quantitatively analyzing tactile sense using the standard sample for tactile quantitative analysis according to any one of [1] to [7].

[10] A tactile measurement system including means for measuring tactile sense and means for calibrating tactile sense, wherein the means for calibrating tactile sense calibrates the measured tactile sense value using the standard sample for tactile quantitative analysis according to any one of [1] to [7].

Effect of the Invention

[0008] According to the present embodiment, it is possible to provide a standard sample for tactile quantitative analysis, a method for manufacturing the same, and a tactile quantitative analysis method capable of quantitatively analyzing touch.

Brief Description of the Drawings

[0009]

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Embodiments for Carrying Out the Invention

[0010] (Standard sample for tactile quantitative analysis) The standard sample for tactile quantitative analysis according to an embodiment of the present invention (sometimes referred to as "the standard sample for tactile quantitative analysis of this embodiment" or simply "the standard sample of this embodiment") is a standard sample for tactile quantitative analysis for quantitatively analyzing the tactile sensation of a measurement object using a device for measuring tactile sensation. The standard sample of this embodiment has a base material and a layer formed of a binder resin composition. The binder resin composition includes a binder resin and at least one selected from the group consisting of organic beads and inorganic beads.

[0011] The "tactile sensation" of the present invention refers to the "narrow sense of tactile sensation" limited to skin sensation. That is, it is the original perceptual sensibility when touching something, which can be expressed in five dimensions of the hardness, micro-roughness, macro-roughness, friction, and warm / cold sensation of the object. The standard sample for tactile quantitative analysis of this embodiment is preferably used as a standard sample when analyzing at least two or more of the five-dimensional tactile sensations including the above micro-roughness, macro-roughness, friction, and warm / cold sensation. As an example, for example, in the examples described later, it can be used as a standard sample when analyzing roughness (for example, micro-roughness) and friction. That is, the tactile sensation related to the standard sample for tactile quantitative analysis of the embodiment may target roughness and friction in tactile sensation. The roughness may be micro-roughness. In the specific example shown in the examples described later, for one standard sample, micro-roughness and friction can be measured with a predetermined tactile sensor. And, for example, by using six or more standard samples as follows, the tactile sensation of the measurement object within the range can be quantitatively analyzed. At the time of filing this application, there are no regulations in Japanese national standards or international standards regarding the measurement method, unit, etc. of "tactile sensation". In this embodiment, as an example, a standard sample for quantitatively measuring micro-roughness and friction has been described. However, the standard sample for tactile quantitative analysis of this embodiment is not limited to the corresponding measurement method, unit, etc. of tactile sensation. Also, "tactile sensation" expressed in three or more dimensions including other evaluation items (for example, hardness) other than micro-roughness and friction may be used.

[0012] The "standard sample" of the present invention is a reference sample as a reference material for ordinary quantitative analysis. The quantitative analysis here includes, like ordinary quantitative analysis, for example, creating a calibration curve and obtaining a measurement result of tactile sensation from the electrical signal obtained by an analytical device. Also, the standard sample for tactile quantitative analysis of the present embodiment may be a standard sample for the purpose of obtaining machine learning data in order to create a machine learning model for measuring (evaluating) tactile sensation.

[0013] [Base material] The base material constituting the standard sample for tactile quantitative analysis of the present embodiment is not particularly limited in terms of its material, shape, etc. It is preferably adjusted as much as possible to the object to be measured. For example, as shown in FIG. 1, when the object to be measured is flat, it is preferable to install a layer formed of a binder resin composition on the flat base material of the standard sample of the present embodiment. In that case, from the viewpoint of easy measurement, for example, the thickness of the base material is preferably 5 μm or more, and preferably 20 μm or more in consideration of the ease of applying the binder resin. There is no particular upper limit to the thickness of the base material, but considering the coating limitation, a thickness of 1 m or less is preferable. When the object to be measured has a shape with a curved surface such as a sphere, a layer formed of a binder resin composition may be installed on the curved surface of this base material for the standard sample of the present embodiment (not shown). For example, it can be installed by spray coating the binder resin. This is because, as a standard sample, when it is in the same form as the object to be measured as much as possible, the result of quantitative measurement becomes more accurate.

[0014] [Layer formed by binder resin composition] The standard sample for tactile quantitative analysis of the present embodiment has a surface layer formed using a binder resin composition. That is, the standard sample of the present embodiment preferably has a laminate in which the binder resin composition is coated and dried.

[0015] [Laminated film and forming method] The laminated film that constitutes the standard sample of this embodiment is a surface layer (also referred to as a laminated film) formed by coating a binder resin composition on a substrate or on the surface of an article using the binder resin composition. Examples of the coating method of the binder resin composition include bar coater coating, roll coater coating, spray coating, gravure coating, reverse gravure coating, offset printing, flexographic printing, screen printing method, etc., and any method may be used. Regarding the coating amount of the binder resin composition, in the case of a paint directly applied to a substrate, it is 5 to 20 g / m in terms of solid content 2 , preferably, it is used under coating conditions of 8 to 15 g / m 2 When used as an overprint varnish for films, it is 3 to 12 g / m 2 , preferably, it is used under coating conditions of 5 to 10 g / m 2

[0016] When the binder resin composition according to this embodiment is an ultraviolet-curable varnish composition, curing can proceed by irradiation with energy rays such as ultraviolet rays. Regarding the irradiation energy of energy rays such as ultraviolet rays, from the viewpoint of ultraviolet curability, it is preferably in the range of 0.1 to 10 J / cm 2 , more preferably in the range of 0.2 to 5 J / cm 2 , still more preferably in the range of 0.25 to 3 J / cm 2 Regarding the illuminance of energy rays such as ultraviolet rays, from the viewpoints of adhesiveness and curability, it is preferably in the range of 0.001 to 2 W / cm2, more preferably in the range of 0.01 to 1.5 W / cm 2 , still more preferably in the range of 0.05 to 1 W / cm 2 As the ultraviolet light source, for example, known lamps such as xenon lamps, xenon-mercury lamps, metal halide lamps, high-pressure mercury lamps, low-pressure mercury lamps, and LEDs can be used. Note that the irradiation energy and illuminance of ultraviolet light are based on the values measured in the wavelength range of 320 to 390 nm using a UV checker; UV Power PucK (II) (manufactured by Electronic Instrumentation and Technology).

[0017] When the binder resin composition according to this embodiment is a thermosetting varnish composition, curing can be advanced by heating. As the heating conditions at this time, it is preferably processed at a temperature of 100°C to 160°C for a holding time of 60 seconds to 300 seconds, and more preferably processed at a temperature of 120°C to 160°C for a holding time of 120 seconds to 300 seconds.

[0018] <Binder Resin Composition> The binder resin composition used to form the surface layer (laminated film) constituting the standard sample for tactile quantitative analysis of this embodiment contains a binder resin and at least one selected from the group consisting of organic beads and inorganic beads. It is preferably a dispersion containing a binder resin and at least one selected from the group consisting of organic beads and inorganic beads.

[0019] "Thermosetting Varnish Composition" The thermosetting varnish composition used to form the surface layer (laminated film) constituting the standard sample for tactile quantitative analysis of this embodiment is not particularly limited, but preferably contains an acrylate compound (A), an epoxy resin (B), a filler (C) containing organic beads and / or inorganic beads, a polyethylene wax (D), and a silicone (E).

[0020] The acrylate compound used in the present invention may be any compound having an acryloyl group in its structure, and may be monofunctional or bifunctional or higher. Examples of these acrylate compounds include bisphenol A type diacrylate compounds, bisphenol F type diacrylate compounds, bisphenol B type diacrylate compounds, glycidyl ether type diacrylate compounds, methylol type acrylate compounds, isocyanuric acid type diacrylate compounds, cyclodecane type diacrylate compounds, urethane acrylate compounds obtained by reacting isocyanate groups with hydroxyl groups, etc. Preferably, they are bisphenol A type diacrylate compounds, isocyanuric acid type diacrylate compounds, urethane (meth)acrylate compounds, and more preferably urethane (meth)acrylate. These acrylate compounds may be used alone or in combination of two or more.

[0021] <Urethane (meth)acrylate (A1)> Urethane (meth)acrylate (A1) is effective as a component for imparting flexibility to the coating film and maintaining the properties of the filler. As urethane (meth)acrylate (A1), for example, those obtained by reacting a polyol (a1), a polyisocyanate (a2), and a (meth)acrylic compound (a3) having a hydroxyl group or an isocyanate group can be used.

[0022] In the present invention, "urethane (meth)acrylate" means urethane acrylate and / or urethane methacrylate, "(meth)acrylic compound" means methacrylic compound and / or acrylic compound, "(meth)acrylate" means methacrylate and / or acrylate, "(meth)acryloyl group" means methacryloyl group and / or acryloyl group, and "(meth)acrylic acid" means methacrylic acid and / or acrylic acid.

[0023] As the polyol (a1), for example, polyether polyol, polyester polyol, polycarbonate polyol, etc. can be used. These polyols may be used alone or in combination of two or more. The polyol (a1) is appropriately determined according to the type of the base material which is the adherend. However, when a polycarbonate base material with increasing demand as the base material is used, it is preferable to use polycarbonate polyol from the viewpoint of adhesion.

[0024] As the polyisocyanate (a2), for example, aromatic polyisocyanates such as xylylene diisocyanate, phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate; aliphatic or alicyclic polyisocyanates such as hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, diisocyanatomethylcyclohexane, tetramethylxylylene diisocyanate, etc. can be used. These polyisocyanates may be used alone or in combination of two or more. Among these, from the viewpoint of further improving adhesion, it is preferable to use alicyclic polyisocyanate, and it is more preferable to use one or more polyisocyanates selected from the group consisting of 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, cyclohexane diisocyanate and diisocyanatomethylcyclohexane.

[0025] The (meth)acrylic compound (a3) having an isocyanate group or a hydroxyl group is used for the purpose of introducing a (meth)acryloyl group into the urethane (meth)acrylate (A1).

[0026] In addition, examples of the (meth)acrylic compound having an isocyanate group that can be used as the (meth)acrylic compound (a3) include 2-(meth)acryloyloxyethyl isocyanate, 2-(2-(meth)acryloyloxyethyloxy)ethyl isocyanate, 1,1-bis((meth)acryloyloxymethyl)ethyl isocyanate, and the like. These compounds may be used alone or in combination of two or more. Among these, from the viewpoint of easy availability of raw materials, it is preferable to use 2-(meth)acryloyloxyethyl isocyanate, and from the viewpoint of curability, it is more preferable to use 2-acryloyloxyethyl isocyanate.

[0027] Examples of the (meth)acrylic compound having a hydroxyl group that can be used as the (meth)acrylic compound (a3) include (meth)acrylic acid alkyl esters having a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and hydroxyethyl acrylamide; polyfunctional (meth)acrylates having a hydroxyl group such as trimethylolpropane di(meth)acrylate, pentaerythritol tri(meth)acrylate, and dipentaerythritol penta(meth)acrylate; polyethylene glycol monoacrylate, polypropylene glycol monoacrylate, and the like. These compounds may be used alone or in combination of two or more. Among these, from the viewpoints of easy availability of raw materials, curability, and adhesion, it is preferable to use (meth)acrylic acid alkyl esters having a hydroxyl group, and it is more preferable to use 2-hydroxyethyl acrylate and / or 4-hydroxybutyl acrylate.

[0028] As a method for producing urethane (meth)acrylate (A1) when using a (meth)acrylic compound (a3) having an isocyanate group as the (meth)acrylic compound (a3), for example, in the absence of a solvent, a polyol (a1) and a polyisocyanate (a2) are charged and reacted to obtain a urethane prepolymer having a hydroxyl group, and then a (meth)acrylic compound (a3) having an isocyanate group is supplied and mixed and reacted. Examples of the method include those described above. The above reaction is preferably carried out, for example, under the conditions of 20 to 120 °C for 30 minutes to 24 hours.

[0029] As a method for producing urethane (meth)acrylate (A1) when using a (meth)acrylic compound (a3) having a hydroxyl group as the (meth)acrylic compound (a3), for example, in the absence of a solvent, after charging a polyol (a1) and a (meth)acrylic compound (a3) into the reaction system, a polyisocyanate (a2) is supplied and mixed and reacted; in the absence of a solvent, a polyol (a1) and a polyisocyanate (a2) are reacted to obtain a urethane prepolymer having an isocyanate group, and then a (meth)acrylic compound (a3) having a hydroxyl group is supplied and mixed and reacted. Examples of the method include those described above. The above reaction is preferably carried out, for example, under the conditions of 20 to 120 °C for 30 minutes to 24 hours.

[0030] When producing urethane (meth)acrylate (A1), a polymerization inhibitor, a urethanization catalyst, etc. may be used as necessary.

[0031] As the polymerization inhibitor, for example, 3,5-bis-tert-butyl-4-hydroxytoluene, hydroquinone, methylhydroquinone, hydroquinone monomethyl ether (methoxyquinone), parater-butylcatechol methoxyphenol, 2,6-di-tert-butylcresol, phenothiazine, tetramethylthiuram disulfide, diphenylamine, dinitrobenzene, etc. can be used. These polymerization inhibitors may be used alone or in combination of two or more.

[0032] As the urethanization catalyst, for example, nitrogen-containing compounds such as triethylamine, triethylenediamine, and N-methylmorpholine; metal salts such as potassium acetate, zinc stearate, and tin octylate; organometallic compounds such as dibutyltin laurate and zirconium tetraacetylacetonate can be used. These urethanization catalysts may be used alone or in combination of two or more.

[0033] In addition, when producing urethane (meth)acrylate (A1), finally, for the purpose of deactivating the isocyanate groups remaining in the urethane (meth)acrylate (A1), an alcohol such as methanol may be added.

[0034] The weight average molecular weight of the urethane (meth)acrylate (A1) is preferably in the range of 500 to 50,000, more preferably in the range of 3,000 to 40,000, from the viewpoints of flexibility and suppression of curing shrinkage. The weight average molecular weight of the urethane (meth)acrylate (A1) indicates the value measured under the following conditions by the gel permeation chromatography (GPC) method.

[0035] Measuring device: High-speed GPC device ("HLC-8220GPC" manufactured by Tosoh Corporation) Column: The following columns manufactured by Tosoh Corporation were connected in series and used. "TSKgel G5000" (7.8 mm I.D. × 30 cm) × 1 piece "TSKgel G4000" (7.8 mm I.D. × 30 cm) × 1 piece "TSKgel G3000" (7.8 mm I.D. × 30 cm) × 1 piece "TSKgel G2000" (7.8 mm I.D. × 30 cm) × 1 piece Detector: RI (differential refractometer) Column temperature: 40 °C Eluent: Tetrahydrofuran (THF) Flow rate: 1.0 mL / min Injection volume: 100 μL (tetrahydrofuran solution with a sample concentration of 0.4 mass%) Standard sample: A calibration curve is created using the following standard polystyrene.

[0036] [[Standard polystyrene]] "TSKgel Standard Polystyrene A-500" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene A-1000" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene A-2500" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene A-5000" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-1" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-2" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-4" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-10" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-20" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-40" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-80" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-128" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-288" manufactured by Tosoh Corporation "TSKgel Standard Polystyrene F-550" manufactured by Tosoh Corporation

[0037] As the urethane (meth) acrylate (A1), from the viewpoint of reducing the crosslinking density and further suppressing the curing shrinkage, it is preferably a so-called bifunctional urethane (meth) acrylate having two (meth) acryloyl groups.

[0038] From the viewpoint of the feel of the coating film, the glass transition point of the urethane (meth) acrylate (A1) is preferably in the range of 30 to 60°C.

[0039] [[Epoxy resin (B)]] Examples of the epoxy resin (B) include various commercially available epoxy resins such as epi-bis type, novolac type, β-methyl epichlorohydrin type, cyclic oxirane type, glycidyl ether type, glycidyl ester type, polyglycol ether type, glycol ether type, epoxidized fatty acid ester type, polyvalent carboxylic acid ester type, aminoglycidyl type, resorcinol type, etc. Among these, epi-bis type epoxy resins are preferably used because of their good scratch resistance of the coating film.

[0040] Examples of commercially available products of the epoxy resin (B) include bisphenol A (BPA) type products such as Epicoat (EPIKOAT) 1001, Epicoat (EPIKOAT) 1004, EP ICLON N-865, EPICLON N-870, etc. Examples of the modified novolac type epoxy resin, as examples of the epoxy resin (C-1) not containing bisphenol A, include phenol novolac type epoxy resins such as EPICLON N-730, EPICL ON N-740, EPICLON N-770, etc. manufactured by DIC Corporation, and cresol novolac type epoxy resins such as EPICLON N-660, EPICLON N-665, EPICLON N-670, EPICLON N-673, EPICLON N-680, EPICLON N-690, EPICLON N-695, AER ECN-1273 manufactured by Asahi Kasei Epoxy Co., Ltd., and AER ECN-1299 manufactured by the same company. Furthermore, as long as it is an epoxy resin not containing bisphenol A, it is preferable because unreacted bisphenol A does not elute, especially in terms of hygiene and food applications. Note that the epoxy resin not containing bisphenol A means an epoxy resin not containing a structure derived from the bisphenol A skeleton.

[0041] From the viewpoint of promoting crosslinking and maintaining scratch resistance, the epoxy resin (B) is preferably a bifunctional epoxy resin.

[0042] <Beads (C)> As the filler (C), either inorganic beads or organic beads may be used. Any one of these may be used, or two or more of them may be used in combination. The filler (C) preferably has a Young's modulus of 0.1 MPa to 100 GPa. The average particle diameter of the filler (C) is not particularly limited, but for example, it is preferably 100 μm or less, for example, in the range of 0.1 to 70 μm, and more preferably in the range of 1 to 50 μm. This is because when the particle diameter is small, the filler is buried in the coating film and a good touch feeling cannot be obtained, and when the particle diameter is large, problems such as poor abrasion resistance, product stability (sedimentation), and coating unevenness occur.

[0043] <<Organic beads>> Examples of the organic beads include organic fillers or resin beads selected from acrylic resin, urethane resin, nylon resin, polypropylene resin, or urea-based resin. Among them, urethane resin beads and silica (silicon dioxide) are preferable from the viewpoint of touch feeling.

[0044] <<Inorganic beads>> Examples of the inorganic beads include inorganic beads selected from silica (silicon dioxide), clay, heavy calcium carbonate, light calcium carbonate, precipitated barium sulfate, calcium silicate, synthetic silicate, and silicic acid fine powder.

[0045] <Polyethylene wax (D)> The curable varnish composition of the present invention contains polyethylene wax. From the viewpoints of the lubricity, scratch resistance, and touch feeling of the coating film, polyethylene wax is preferably used. The average particle diameter of the polyethylene wax is preferably in the range of, for example, 2 to 8 μm. If the average particle diameter of the polyethylene wax is 2 μm or more, the area of the polyethylene wax floating on the coating film surface is reduced, and the problem that sufficient scratch resistance and lubricity cannot be obtained can be prevented. On the other hand, if the average particle diameter of the polyethylene wax is 8 μm or less, the unevenness of the coating film surface becomes prominent, and the problem that it may cause poor appearance can be prevented.

[0046] <Silicone (E)> The curable varnish composition of the present invention contains silicone (polysiloxane). Examples of the silicone include various silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, octamethyltrisiloxane, tetradecamethylhexasiloxane, dimethylsiloxane·methyl(polyoxyethylene)siloxane·methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane·methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane·methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane·methylcetyloxysiloxane copolymer, dimethylsiloxane·methylstearoxysiloxane copolymer. Among them, methylhydrogenpolysiloxane and methylpolysiloxane are preferable.

[0047] <Other components> When the curable varnish composition of the present invention is an ultraviolet curable varnish composition, it is necessary to add a photoinitiator for curing with ultraviolet rays. Also, in the present invention, it is important to contain a photopolymerization inhibitor.

[0048] Examples of the photopolymerization initiator that can be used in the present invention include cleavage-type ones such as benzoin isobutyl ether, benzyl, 1-hydroxycyclohexyl phenyl ketone, benzoin ethyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2-methyl-propan-1-one, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, phenylglyoxylic acid methyl ester, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and hydrogen abstraction-type photopolymerization initiators such as benzophenone, 4-phenylbenzophenone, isophthalophenone, 4-benzoyl-4'-methyl-diphenyl sulfide, 2,4-diethylthioxanthone, 2-isopropylthioxanthone. These can be used alone or in combination of two or more kinds.

[0049] The photopolymerization inhibitor is added for the purpose of preventing the polymerization reaction in the coating liquid during storage and storage of the paint or during the painting operation. As this component, for example, an appropriate amount of hydroquinone (HQ), methylhydroquinone (MEHQ), 3,5-dibutyl-4-hydroxytoluene (BHT), butylhydroxyanisole, etc. can be blended.

[0050] The binder resin composition according to this embodiment exhibits a low viscosity suitable for coating even without a solvent, but an organic solvent may be added if necessary. For example, ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, cyclic ethers such as tetrahydrofuran and dioxolane, esters such as methyl acetate, ethyl acetate, and butyl acetate, aromatics such as toluene and xylene, and alcohols such as carbitol, cellosolve, methanol, toluene, isopropanol, butanol, and propylene glycol monomethyl ether can be mentioned. These may be used alone or in combination of two or more kinds. In addition, the binder resin composition according to this embodiment may contain various additives such as a leveling agent, a thixotropic agent, waxes other than those described above, a drying agent, a thickening agent, a sag prevention agent, a plasticizer, a dispersant, a sedimentation inhibitor, an antifoaming agent, an ultraviolet absorber, a light stabilizer, a release agent, an inorganic pigment, an organic pigment, and a extender pigment, if necessary.

[0051] The binder resin composition according to this embodiment mixes the above-described components in appropriate desired ratios. The mixing ratio is not particularly limited. For example, with respect to the binder resin composition, urethane (meth) acrylate (A1) is preferably contained in an amount of 50 to 90 parts by mass, more preferably 70 to 85 parts by mass. Also, with respect to the binder resin composition, epoxy resin (B) is preferably contained in an amount of 1 to 10 parts by mass, more preferably 5 to 7 parts by mass. Further, with respect to the binder resin composition, filler (C) containing resin beads and / or inorganic beads is preferably contained in an amount of 5 to 30 parts by mass, more preferably 9 to 12 parts by mass. Also, with respect to the cured varnish composition, polyethylene wax (D) is preferably contained in an amount of 0.2 to 2 parts by mass, more preferably 0.4 to 1 part by mass. Further, with respect to the cured varnish composition, silicone (E) is preferably contained in an amount of 0.1 to 1 part by mass, more preferably 0.1 to 0.5 part by mass. Furthermore, when the binder resin composition according to this embodiment is an ultraviolet-curable varnish composition, the ultraviolet-curable varnish composition may contain a photoinitiator and a photopolymerization inhibitor. With respect to the ultraviolet-curable varnish composition, it is preferable to contain 1 to 5 parts by mass of the photoinitiator, and more preferably 1.5 to 3.5 parts by mass. Also, with respect to the ultraviolet-curable varnish composition, it is preferable to contain 0.1 to 1 part by mass of the photopolymerization inhibitor, and more preferably 0.1 to 0.5 part by mass.

[0052] As a preferred embodiment of the mixing ratio of each component of the binder resin composition according to this embodiment, there is an ultraviolet-curable varnish composition mixed at a ratio of 50 to 90 parts by mass of urethane (meth) acrylate (A1), 1 to 10 parts by mass of epoxy resin (B), and 5 to 30 parts by mass of a filler (C) containing resin beads and / or inorganic beads. Also, there is a binder resin composition mixed at a ratio of 50 to 90 parts by mass of urethane (meth) acrylate (A1), 1 to 10 parts by mass of epoxy resin (B), 5 to 30 parts by mass of a filler (C) containing resin beads and / or inorganic beads, 0.2 to 2 parts by mass of polyethylene wax (D), and 0.1 to 1 part by mass of silicone (E). Furthermore, when the ultraviolet-curable varnish composition contains a photoinitiator and a photopolymerization inhibitor, as a preferred embodiment of the mixing ratio of each component of the ultraviolet-curable varnish composition, there is an ultraviolet-curable varnish composition mixed at a ratio of 50 to 90 parts by mass of urethane (meth) acrylate (A1), 1 to 10 parts by mass of epoxy resin (B), 5 to 30 parts by mass of a filler (C) containing resin beads and / or inorganic beads, 1 to 5 parts by mass of the photoinitiator, and 0.1 to 1 part by mass of the photopolymerization inhibitor. Also, there is an ultraviolet-curable varnish composition mixed at a ratio of 50 to 90 parts by mass of urethane (meth) acrylate (A1), 1 to 10 parts by mass of epoxy resin (B), 5 to 30 parts by mass of a filler (C) containing resin beads and / or inorganic beads, 0.2 to 2 parts by mass of polyethylene wax (D), 0.1 to 1 part by mass of silicone (E), 1 to 5 parts by mass of the photoinitiator, and 0.1 to 1 part by mass of the photopolymerization inhibitor.

[0053] [Tactile Measurement Device (Tactile Sensor)] The device for measuring tactile sensation (sometimes referred to as a tactile measurement device), which is calibrated using the standard sample for tactile quantitative analysis of the present embodiment, is not particularly limited as long as it can measure (evaluate) the tactile sensation of the object to be measured. The tactile measurement device according to the present embodiment may be a tactile sensor. Examples of the tactile sensor include the tactile sensor shown in FIG. 3 used in the examples described later. A triaxial force sensor is attached to the tip of a stainless steel rod, and the sensor part is wrapped with artificial leather supler or a silicone rubber sheet and fixed to the stainless steel rod with a binding band. The triaxial force sensor can detect forces in the x, y, and z directions. Therefore, by touching the standard sample of the present embodiment with the tactile sensor shown in FIG. 3, indices of roughness and friction can be obtained. The validity of the standard sample of the present invention can be verified by this example of the tactile sensor. The tactile sensor shown in FIG. 3 above is an example prepared for verifying the present invention. In reality, as long as it is a tactile measurement device (tactile sensor) that can measure (evaluate) the tactile sensation expressed in at least two or more dimensions among the five dimensions of hardness, micro-roughness, macro-roughness, friction, and thermal and cold sensations described above, the standard sample of the present invention can be used.

[0054] [Characteristics of the Standard Sample for Tactile Quantitative Analysis] The standard sample for tactile quantitative analysis of the present embodiment will be described by taking, as an example, the tactile sensation expressed in two dimensions consisting of micro-roughness and friction, like the standard sample for tactile quantitative analysis manufactured in the examples described later. The standard sample for tactile quantitative analysis of the present embodiment may be a tactile sensation expressed in at least two dimensions from the five dimensions of hardness, micro-roughness, macro-roughness, friction, and thermal and cold sensations described above, and is not limited to the two dimensions consisting of micro-roughness and friction. In this embodiment, the method for obtaining the coefficient of friction is not selected. As a method for measuring the coefficient of friction, for example, a commercially available friction measuring instrument that has been available in the past, such as the multi-functional static and dynamic friction measuring instrument TL201Tt of Trinity Lab, can be used to perform friction evaluation in accordance with JIS-K-7125. The jig that touches the standard sample preferably has a high correlation with the frictional properties felt by humans. For example, a finger model type tactile contactor of Trinity Lab can be mentioned. Also, if it is a coating film on a PET film like the standard sample manufactured in the examples of the present application, a method of directly touching with a human hand like a tactile force plate manufactured by Techno-Techno Co., Ltd. and measuring friction may also be used. The standard sample for tactile quantitative analysis of this embodiment preferably has a kinetic friction coefficient of 3.0 or less, more preferably 2.0 or less, and even more preferably 1.0 or less. It may also be 0.1 or more, or 0.3 or more. More specifically, it is preferably the kinetic friction coefficient at a measurement speed of 50 mm / s. Also, when the above kinetic friction coefficient is the kinetic friction coefficient of the hand described below, the friction coefficient is preferably 2.0 or less, more preferably 1.5 or less, and even more preferably 1.0 or less. It may also be 0.1 or more, or 0.2 or more. More specifically, it is preferably the kinetic friction coefficient at a measurement speed of 50 mm / s.

[0055] Also, the micro roughness can be evaluated by the arithmetic mean roughness Ra or the arithmetic mean height Sa as follows. The standard sample for tactile quantitative analysis of this embodiment preferably has an arithmetic mean roughness Ra or an arithmetic mean height Sa of 15 μm or less, more preferably 10 μm or less, and may also be 0.1 μm or more. If Ra or Sa becomes too large, it will be in the region of macro roughness where the roughness can be felt just by touching.

[0056] <Coefficient of kinetic friction when touched by hand (coefficient of kinetic friction of hand)> In this embodiment, the dynamic friction coefficient is not measured using a device having a friction element, but is obtained by directly measuring it by touching it with a human hand. As a result, since the tactile sensation received from the measurement sample can be quantified and evaluated in consideration of the tactile sensation due to the movement of a human finger, friction data having a better correlation with the human tactile sensation can be obtained.

[0057] <<Measuring device for dynamic friction coefficient of hand (tactile sensation detection device)>> As the measuring device (tactile sensation detection device) used in the method for measuring the dynamic friction coefficient, a plate on which a measurement sample is placed, a plurality of load detection sensors for detecting the load applied to the plate, and using the load detection sensors, a load calculation means for detecting the load in the XYZ directions when a finger contacts the measurement sample, and a moving state calculation means for calculating the moving speed of the load position applied to the measurement sample from the loads applied to the plurality of load detection sensors can be used. For example, the measuring device described in JP-A-2019-144213 or the like can be used. As a more preferable embodiment of the measuring device, a tactile sensation detection device 1 as shown in FIGS. 9 to 11 can be mentioned. The tactile sensation detection device 1 is configured to be able to quantify and evaluate the tactile sensation of the measurement sample 4. As shown in FIGS. 9 and 10, it includes a flat plate 2 for placing the measurement sample 4 and load detection sensors 3 provided near the four corners of the plate 2. Characteristically, when moving the measurement sample 4 placed and fixed on the plate 2 while pressing it with a finger in a tracing manner, the load in the vertically downward direction of the plate 2 and the load along the plane direction of the plate 2 are detected, and also the COP (center of pressure), which is the pressing part of the finger, is obtained from the load detection sensors 3 provided near the four corners. Then, the moving speed of the finger and the like are detected from the moving time of the COP, and the dynamic friction coefficient and the like are calculated from the load in the vertically downward direction, the load in the plane direction of the plate 2, the moving speed, etc., to quantify the tactile sensation. In FIGS. 9 and 10, reference numeral 41 indicates a fixture for fixing the measurement sample 4 to the plate 2. Also, when viewed from the top surface of the tactile sensation detection device shown in FIGS. 9 and 10, it is like the photograph shown in FIG. 11.

[0058] <Method for Measuring Coefficient of Kinetic Friction of Hand> As long as the measurement is made by touching with a human hand, there is a possibility that the measurement results will vary. Therefore, it is preferable to average the results of touching by multiple experimenters of a wide range of ages and genders. There is no upper limit to the number of experimenters, but it is preferable to average the data of five or more experimenters. Also, it is preferable to standardize the vertical load applied, the speed of touching, and the way of touching such as which finger to trace. For example, it is desirable to give prior instructions such as tracing with the palm at a speed of 50 mm / s and a vertical load of 200 g, and to sufficiently practice touching the material before this measurement.

[0059] From the coordinates when the material is touched by hand, or the displacement of the touch, the speed at the time of touching can be obtained by excluding the unit time. Also, the coefficient of friction at the time of touching can be obtained by dividing the horizontal load at the time of touching by the vertical load. Even if prior instructions are given, since it is touched with a human hand, friction values at various speeds and vertical loads can be obtained. Therefore, it is preferable to focus on the coefficient of friction at a specific speed and vertical load. For example, it is preferable to obtain the value obtained by aggregating and averaging the values of the coefficient of friction at a speed of 50 mm / s and a vertical load of 200 g for all subjects.

[0060] <Measurement of Micro Roughness> The method for measuring the roughness of the surface (coated surface) of the standard sample for tactile quantitative analysis of the present embodiment is not particularly limited, and a method for measuring a wide area is preferable. From that viewpoint, a method using a contact roughness meter is preferable. Also, since the base material is not a flat plate, a profilometer can be used when the coated surface is a curved surface. When using a laser microscope or a white interference microscope, it may be used in a measurement method of taking an image that can secure a measurement length in accordance with JIS B0601 and JIS B0633.

[0061] (Manufacturing Method of Standard Sample for Tactile Quantitative Analysis) The manufacturing method of the standard sample for tactile quantitative analysis according to an embodiment of the present invention (sometimes referred to as the manufacturing method of the standard sample of the present embodiment) includes the following two steps. Step 1: Select the base material according to the object to be measured, and apply the binder resin composition on at least one surface of the base material. Step 2: Cure the binder resin composition applied to the base material. When the object to be measured is flat, examples of the base material include a glass substrate, a silicon substrate, a resin substrate, etc. Examples of the resin substrate include a PET film, a polyimide film, an acrylic plate, etc. When the binder resin composition according to the present embodiment is an ultraviolet-curable varnish composition, using the ultraviolet-curable varnish composition, for example, a PET film with a thickness of 20 to 200 μm is coated with a dry film thickness of 4 to 6 g / m 2 using a bar coater, dried and heated at 70 to 120 °C for 5 seconds to volatilize the plastic solvent, and then cured with an UV irradiation device manufactured by Fusion UV Systems at an integrated light quantity of 300 mJ / cm 2 to produce a standard sample for tactile quantitative analysis of the present embodiment. The standard sample for tactile quantitative analysis obtained by the method for producing a standard sample of the present embodiment is composed of a coating / painting of a binder varnish composed of an organic / inorganic filler and a curable resin (Figure 1). This can be coated on various base materials. In the above, spray coating may be used instead of coating with a bar coater. The base material may be a flat base material such as a PET film, or a base material having a three-dimensional shape. Also, when the binder resin composition according to the present embodiment is a thermosetting varnish composition, the method for curing the thermosetting resin may be thermosetting.

[0062] In the method for producing a standard sample of the present embodiment, the key to roughness and friction is held by a filler composed of organic beads and / or inorganic beads. When the size of the filler is large and the amount is large, the roughness becomes high. Also, when using soft organic beads, there is an effect of increasing the friction. On the other hand, from the viewpoint of easy coating, printing, and painting, it is preferable not to use fillers that are too large in size (for example, 50 μm or more) or a large amount of fillers (for example, 50 wt% or more). Therefore, the micro-roughness that can be expressed is preferably 15 μm or less as Ra or Sa.

[0063] Also, when the binder resin composition according to the above embodiment is an ultraviolet curable varnish composition, the ratio of the photoinitiator and the photopolymerization inhibitor can be controlled to change the hardness of the cured film. That is, if there is too much initiator, the degree of polymerization will be low and the cured film will be soft. Also, if there is too much inhibitor, there is a possibility that curing will not proceed sufficiently. When the cured film is soft, the dynamic friction coefficient tends to be high. On the other hand, the roughness does not change. By such a method, a plurality of coated articles with different roughness and friction levels can be produced (Figure 2). It is preferable that the standard sample has at least 3 levels of roughness and at least 3 levels of friction because the calibration of the tactile sensor is possible. Of course, the more the number, the higher the calibration accuracy, so it is more preferable.

[0064] (Set of standard samples for tactile quantitative analysis) The set of standard samples for tactile quantitative analysis according to an embodiment of the present invention includes 6 or more of the above standard samples for tactile quantitative analysis, and preferably 9 or more. There is no particular limitation on the upper limit, and in ordinary quantitative analysis, for example, it may be 100 or less. Also, in the case of a standard sample for creating machine learning data, it may be 500 or less. Among the five dimensions of hardness, micro-roughness, macro-roughness, friction, and warmth / coldness described above, for example, when using a tactile measurement device (tactile sensor) that can measure (evaluate) the tactile sensation expressed in two dimensions as in the examples described later, the set of standard samples of this embodiment includes 6 or more. For example, if there are a total of 6 standard samples with 2 or more levels in the first dimension and 3 or more levels in the second dimension, the calibration of the tactile sensor is possible. The above 6 standard samples are, for example, as follows.

[0065] (First dimension level A1, second dimension level B1), (First dimension level A1, second dimension level B2), (First dimension level A1, second dimension level B3) (First dimension level A2, second dimension level B1)(First dimension level A2, second dimension level B2)(First dimension level A2, second dimension level B3)

[0066] Preferably, if there are at least 3 levels in the first dimension and at least 3 levels in the second dimension, and a total of 9 standard samples, the calibration of the tactile sensor is possible. For example, if there are at least 3 levels in the first dimension and at least 3 levels in the second dimension, and a total of 9 standard samples, the calibration of the tactile sensor is possible. The above 9 standard samples are, for example, as follows. (First dimension level A1, second dimension level B1), (First dimension level A1, second dimension level B2), (First dimension level A1, second dimension level B3) (First dimension level A2, second dimension level B1)(First dimension level A2, second dimension level B2)(First dimension level A2, second dimension level B3) (First dimension level A3, second dimension level B1)(First dimension level A3, second dimension level B2)(First dimension level A3, second dimension level B3)

[0067] The number of standard samples included in the standard sample set for tactile quantitative analysis of the present embodiment is preferably adjusted according to the number of dimensions of the tactile sensation measured by the tactile measurement device (tactile sensor). For example, when the number of dimensions of the tactile sensation is n dimensions, the number of the standard sample set is preferably 3×n or more, and more preferably 5×n. It is even more preferable that it is 3 to the power of n (3 n ) or more. That is, having standard samples including at least 3 levels for each dimension results in higher calibration accuracy.

[0068] In the examples described later, as described above, a tactile sensor that measures the tactile sensation expressed by the roughness in the first dimension and the friction in the second dimension was used. A specific example of the standard sample set for tactile quantitative analysis of the present embodiment corresponding to the tactile sensor has 3 levels of roughness in the first dimension, 3 levels of friction in the second dimension, and a total of 3 squared (3 2 ) = 9 standard samples (Fig. 2). Calibration of the tactile sensor that measures the tactile sensation expressed in two dimensions is possible.

[0069] (Tactile quantitative analysis method) The tactile quantitative analysis method of an embodiment of the present invention (the tactile quantitative analysis method of the present embodiment) is a method for quantitatively analyzing the tactile sensation using a standard sample for tactile quantitative analysis. It includes at least the following steps. Step I: Select the substrate according to the object to be measured, and form a layer formed by the binder resin composition on the substrate to produce a standard sample for tactile quantitative analysis. Step II: Perform quantitative analysis using the obtained standard sample for tactile quantitative analysis. A method for quantitatively analyzing touch, characterized in that at least three or more kinds of the binder resin compositions are used to produce respective standard samples for tactile quantitative analysis.

[0070] (Tactile measurement system) The tactile measurement system according to an embodiment of the present invention (the tactile measurement system of this embodiment) includes means for measuring touch and means for calibrating touch. The means for calibrating touch calibrates the measured touch value using the standard sample for tactile quantitative analysis of this embodiment. The means for calibrating touch in the tactile measurement system of this embodiment is preferably means capable of measuring tactile elements of two dimensions or more. The tactile elements of two dimensions or more mean, for example, any combination of two dimensions among the five dimensions of hardness, micro-roughness, macro-roughness, friction, and warm and cold sensation. Examples of the means for measuring touch include various known tactile measurement devices. Examples of this tactile device include a tactile measurement device equipped with means for measuring surface roughness and means for measuring the coefficient of friction. Examples of the means for measuring surface roughness include the surface roughness measurement means shown by the surface roughness measurement device described in JP-T-2013-528794. Examples of the means for measuring friction include the KES-SE friction sensation tester manufactured by Kato Tech Co., Ltd. Examples of the means for measuring roughness and friction include the KES-SESRU roughness / friction sensation tester manufactured by Kato Tech Co., Ltd. Here, the means capable of measuring tactile elements of two dimensions or more may be, for example, one device capable of measuring tactile elements of two dimensions or more, or a system including a plurality of devices capable of individually measuring each tactile element.

Examples

[0071] Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to the following examples. In addition, "%" in the compositions of the following examples means "mass%".

[0072] (Raw materials for manufacturing standard samples for tactile quantitative analysis) · Urethane acrylate (A): Lucidya manufactured by DIC Corporation (Tg: 50°C) · Bifunctional epoxy resin (B): Epiklon manufactured by DIC Corporation · Filler (C) · Urethane resin beads: Art Pearl manufactured by Negami Kogyo Co., Ltd., particle diameters: 6 μm, 15 μm, 36 μm · Acrylic resin beads: Art Pearl manufactured by Negami Kogyo Co., Ltd., particle diameters: 6 μm, 15 μm, 32 μm · Nylon resin beads: Orgazol manufactured by Arkema, particle diameters: 6 μm, 40 μm · Polyethylene wax: Ceridust manufactured by Clariant, particle diameter: 8 μm · Silicone: KF series manufactured by Shin-Etsu Chemical Co., Ltd. · Photo radical polymerization initiator: Adeka Arcles manufactured by ADEKA Corporation · Photopolymerization inhibitor: Photopolymerization inhibitor manufactured by Tokyo Chemical Industry Co., Ltd.

[0073] (Measurement of dynamic friction coefficient of hand) Using the tactile force plate TF-2020-GVS device of Techno Kiban Co., Ltd., the dynamic friction coefficient when a human touches with their hand was determined. The dynamic friction coefficients of 8 men and women in their 20s to 50s when they stroked the standard sample with their own hands were obtained at a vertical load of 200 g and a speed of 50 mm / s, and the average value of these by 8 subjects was used.

[0074] (Measurement of roughness) Measurement was performed in accordance with JIS B0601 and JIS B0633 using a contact roughness meter (SURFCOM NEX manufactured by Tokyo Seimitsu Co., Ltd.). The arithmetic mean roughness Ra of the dry coated surface of the standard sample was obtained.

[0075] (Tactile sensor) "Tactile Sensor A: Using Artificial Leather" As the tactile sensor used in the example, the one shown in Fig. 3 was fabricated. A 3-axis force sensor USL06-H5 manufactured by Techno Trade was attached to the tip of a stainless steel bar (390 g) with a diameter of 30 mm and a height of 70 mm. The sensor part was wrapped with artificial leather Supple (manufactured by Idemitsu Techno Fan) and fixed to the stainless steel bar with a binding band.

[0076] "Tactile Sensor B: Using Silicon Rubber" Tactile Sensor B was manufactured in the same manner as Tactile Sensor A, except that it was wrapped with a silicon rubber sheet (Tokawa Rubber) and fixed to the stainless steel bar with a binding band.

[0077] Using the above Tactile Sensor A or Tactile Sensor B, the standard samples of this embodiment created in the examples and comparative examples were measured. The 3-axis force sensor can detect forces in the x, y, and z directions. Therefore, by touching the standard sample of this embodiment with this tactile sensor, indices of roughness and friction can be obtained. Thereby, the validity of the standard sample of the present invention can be verified.

[0078] (Examples 1-7) "Manufacture of Standard Sample for Tactile Quantitative Analysis" In Examples 1-7, after blending the raw materials in Table 1, they were stirred for 3 minutes at a rotational speed of 3000 rpm with a dispersion stirrer to create a varnish composition.

[0079]

Table 1

[0080] The above varnish composition was applied to a 50-μm-thick PET film E-5102 manufactured by Toyobo Co., Ltd. with a bar coater so that the dry film thickness was 4-6 g / m 2 and dried and heated at 100 °C for 5 seconds to volatilize the plastic solvent. Then, it was cured with a UV irradiation device manufactured by Fusion UV Systems at an integrated light quantity of 300 mJ / cm 2 to obtain the standard samples of Examples 1-7. The standard samples of each example were measured for roughness Ra and the dynamic friction coefficient of the hand using the evaluation method described above, and the results are shown in Table 2.

[0081]

Table 2

[0082] The standard sample for tactile quantitative analysis obtained in this example consists of a coating / painting of a binder varnish composed of an organic / inorganic filler and a curable resin (Figure 1). This can be applied to various substrates. Instead of coating with a bar coater, spray coating may also be used. The substrate was PET, but it may also be a molded product or a three-dimensional shape. Also, the method of curing the curable resin may be not only UV curing but also heat curing.

[0083] "Evaluation of Standard Samples Using Tactile Sensors" The above-prepared tactile sensor A was installed on the coating film of the standard samples of Examples 1-7, and this was moved at a speed of 10 mm / s to obtain the forces Fx, Fy, and Fz in the xyz three directions with respect to time. The horizontal force was calculated from Fx 2 + Fy 2 ) 1 / 2 and dividing this by Fz gives the friction coefficient. The graph of time and the friction coefficient in Example 1 is shown in Figure 4. The dynamic friction coefficient, which is an index of friction, and Stick-Slip, which is an index of roughness, were obtained. Stick-Slip represents the rattling feeling when touching the sample and shows a high correlation with roughness parameters such as Ra. Taking Figure 4 as an example, the average value of the friction coefficient from 1000 - 4000 ms was obtained as the dynamic friction coefficient, which was 1.68. Also, the standard deviation value of the friction coefficient from 1000 - 4000 ms was obtained as Stick-Slip, which was 0.030. The results of Examples 1-7 are shown in Table 2. Regarding "Stick-Slip", for example, a detailed explanation is described in Non-Patent Document A below.

[0084] [Non-Patent Document A] Mariko Egawa et al., Skin surface friction characteristics and tactile evaluation, J Soc. Cosmet. Chem. Jpn. 2003, Vol. 37, Pages 187-194

[0085] Stick-Slip is a phenomenon where the sticking state with static friction acting and the sliding state with dynamic friction acting alternately appear on the adhesion surface, and it is also called a feeling of being startled. In the above literature, discrimination of sensory words related to tactile sensations such as moistness is performed using Stick-Slip (mean deviation of friction coefficient (MMD)) evaluated by the KES system.

[0086] The key to roughness Ra and friction is the filler. When the size of the filler is large and the amount is large, the roughness becomes high. Also, using a soft material as the resin or filler has an effect of increasing the friction. As a limit of the manufacturing method, due to coating, printing, and painting, it is not possible to use fillers that are too large (about 100 μm or more) or a large amount of fillers (about 50 wt%). Therefore, the micro-roughness that can be expressed is 15 μm or less as Ra or Sa. By controlling the ratio of the photoinitiator and the photopolymerization inhibitor, the hardness of the cured film can be changed. That is, if there is too much initiator, the degree of polymerization becomes low and the cured film becomes soft. Also, if there is too much inhibitor, there is a possibility that the curing may not proceed sufficiently. When the cured film is soft, the dynamic friction coefficient tends to be high. On the other hand, the roughness does not change. By such a method, a plurality of coated articles with different roughness and friction levels can be created (Figure 2). If the standard sample has at least 3 levels of roughness and at least 3 levels of friction, calibration of the tactile sensor is possible. Of course, the higher the number, the higher the calibration accuracy.

[0087] "Evaluation of Standard Samples Using a Tactile Sensor" Figure 5 shows the results of plotting the Ra of the standard sample coatings of Examples 1-7 on a logarithmic scale with StickSlip when the standard sample coatings were traced with the tactile sensor A of artificial leather. In addition, Fig. 6 shows the results of logarithmically plotting the dynamic friction coefficients of the standard sample coatings in Examples 1-7 against the dynamic friction coefficients when tracing the standard sample coatings with the tactile sensor A made of artificial leather. The standard sample coatings in Examples 1-7 are on the straight lines in Figs. 5 and 6, indicating that a simple relationship can be grasped between the roughness and friction physical property values of the actual material and those of the roughness and friction obtained by the tactile sensor, and it can be seen that they can be used as standard samples for the tactile sensor using artificial leather.

[0088] (Examples 8-12) "Manufacture of Standard Samples for Tactile Quantitative Analysis" In Examples 8-12, after blending the raw materials in Table 1, they were stirred for 3 minutes at a rotational speed of 3000 rpm with a dispersion stirrer to prepare a varnish composition.

[0089] For the above-prepared standard samples for tactile quantitative analysis, except for using the tactile sensor B, the standard samples obtained in Examples 8-12 were evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0090] "Evaluation of Standard Samples Using a Tactile Sensor" Fig. 7 shows the results of logarithmically plotting the Ra of the standard sample coatings in Examples 8-12 against StickSlip when tracing the standard sample coatings with the silicon rubber tactile sensor B. In addition, Fig. 8 shows the results of logarithmically plotting the dynamic friction coefficients of the standard sample coatings in Examples 8-12 against the dynamic friction coefficients when tracing the standard sample coatings with the silicon rubber tactile sensor B. The standard sample coatings in Examples 8-12 are on the straight lines in Figs. 7 and 8, indicating that a simple relationship can be grasped between the roughness and friction physical property values of the actual material and those of the roughness and friction obtained by the tactile sensor, and it can be seen that they can be used as standard samples for the tactile sensor using silicon rubber. Thus, regardless of the material of the tactile sensor, by combining the standard samples created in the present invention, it becomes possible to perform tests and calibrations for the roughness and friction of the tactile sensor.

[0091] "Evaluation of Unknown Samples by a Tactile Sensor Using Calibration Data" The following were used as unknown samples, and the tactile sensors A and B calibrated above were used to trace them to obtain the coefficient of kinetic friction and StickSlip (Table 3).

[0092]

Table 3

[0093] Also, the Ra of the above unknown samples and the coefficient of kinetic friction when traced by hand were obtained by the same method as in the examples.

[0094] The results of plotting the StickSlip when tracing with the tactile sensor A of the above unknown samples against Ra are shown in Fig. 5, and the results of plotting the coefficient of kinetic friction when tracing with the tactile sensor A against the coefficient of kinetic friction of the hand are shown in Fig. 6. The results of plotting the StickSlip when tracing with the tactile sensor B of the above unknown samples against Ra are shown in Fig. 7, and the results of plotting the coefficient of kinetic friction when tracing with the tactile sensor B against the coefficient of kinetic friction of the hand are shown in Fig. 8. The data of the unknown samples lie on the calibration curve of the standard samples. By calibrating with the standard samples created in the present invention, the micro-roughness and friction of any unknown sample can be evaluated with any tactile sensor.

[0095] (Discussion) As shown in Figs. 5 - 8, by using the standard sample group and quantitative analysis method of the present invention, it is possible to calibrate the roughness and friction of any tactile sensor made of any material, and it is also possible to evaluate the roughness and friction when tracing an unknown sample with the tactile sensor. In this implementation, among the five dimensions of hard-soft, micro-roughness, macro-roughness, friction, and warm-cold perception touch, two dimensions of micro-roughness and friction were targeted, but other dimensions or multiple dimensions such as three dimensions can also be used.

Industrial Applicability

[0096] The standard sample for tactile quantitative analysis and the quantitative analysis of touch in this embodiment are used for the calibration of tactile sensors. The tactile sensor can read the force and displacement of the touched part and convert them into hardness, softness, roughness, friction, or evaluate the sense of warmth and cold, and is mainly mounted on robots. This robot has applications in medical care, nursing care, and material handling. According to the present invention, a standard sample for a tactile sensor can be produced inexpensively and in large quantities, and multi-axis evaluation of perceptual touch such as friction and micro-roughness can be performed at once.

Explanation of Signs

[0097] 1 ··· Tactile detection device 2 ··· Plate 3 ··· Load detection sensor 4 ··· Measurement sample 41 ··· Fixture 10: Layer formed of binder resin composition 20: Substrate 15: Beads 100: Standard sample for tactile quantitative analysis 30: SUS bar 40: Silicon rubber sheet / artificial leather 50: 3-axis force sensor 200: Tactile sensor

Claims

1. A standard sample for tactile quantitative analysis for quantitatively analyzing the tactile sensation of a measurement object using a device for measuring tactile sensation, wherein the standard sample for tactile quantitative analysis has a base material and a layer formed of a binder resin composition, and the binder resin composition includes a binder resin and at least one selected from the group consisting of organic beads and inorganic beads, and is a standard sample for tactile quantitative analysis.

2. The standard sample for tactile quantitative analysis according to claim 1, wherein the binder resin is at least one selected from the group consisting of acrylate compounds.

3. The standard sample for tactile quantitative analysis according to claim 1, wherein at least one selected from the group consisting of the organic beads and the inorganic beads is composed of at least one selected from the group consisting of urethane resin, acrylic resin, nylon resin, and silicon dioxide.

4. The standard sample for tactile quantitative analysis according to claim 1, wherein at least one selected from the group consisting of the organic beads and the inorganic beads has a Young's modulus of 0.1 MPa to 100 GPa.

5. The standard sample for tactile quantitative analysis according to claim 1, wherein the binder resin composition is prepared by coating or spray coating on the base material.

6. The standard sample for tactile quantitative analysis according to claim 1, wherein the tactile sensation targets roughness and friction among tactile sensations for sensing.

7. The standard sample for tactile quantitative analysis according to claim 1, wherein the arithmetic mean roughness Ra or the arithmetic mean height Sa of the surface is 15 μm or less.

8. A method for manufacturing a standard sample for tactile quantitative analysis according to any one of claims 1 to 7, comprising a step of applying the binder resin composition on at least one surface of the base material, and a step of curing the binder resin composition applied to the base material. The method for manufacturing a standard sample for tactile quantitative analysis.

9. A tactile quantitative analysis method for quantitatively analyzing tactile sensation using the standard sample for tactile quantitative analysis according to any one of claims 1 to 7.

10. A tactile measurement system including means for measuring tactile sensation and means for calibrating tactile sensation, wherein the means for calibrating tactile sensation calibrates the measured tactile value using the standard sample for tactile quantitative analysis according to any one of claims 1 to 7.

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