CN110887566A - Color measuring method for coated board and color mixing method using the same - Google Patents
Color measuring method for coated board and color mixing method using the same Download PDFInfo
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- CN110887566A CN110887566A CN201910625725.2A CN201910625725A CN110887566A CN 110887566 A CN110887566 A CN 110887566A CN 201910625725 A CN201910625725 A CN 201910625725A CN 110887566 A CN110887566 A CN 110887566A
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Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The present invention provides a method for measuring color of a coated sheet having a multilayer coating film including a colored coating film formed of a colored paint and a transparent coating film formed of a varnish, comprising: (1) a step of forming a colored coating film by applying a colored paint, (2) a step of forming a clear coating film by applying a varnish to the colored coating film, (3-1) a step of measuring color from the surface of the clear coating film with a color meter within 5 minutes after the formation of the clear coating film in a state where a protective sheet having at least a color measuring region of a coating sheet opened is present between the surface of the clear coating film and the color meter, or (3-2) a step of measuring color from the surface of the clear coating film with a color meter in a state where a protective sheet having at least a color measuring region of a coating sheet opened is present between the surface of the clear coating film in an incompletely dried state and the color meter.
Description
Technical Field
Mutual citation of related applications this application claims priority based on the specification of japanese patent application No. 2018-168261, filed on 7.9.2018, the entire disclosure of which is incorporated herein by reference.
The present invention relates to a method for measuring color of a coated sheet having a multilayer coating film including a colored coating film formed of a colored paint and a transparent coating film formed of a varnish, and a method for toning using the method.
Background
In paint shops, automobile refinish shops, tinting shops, etc., there are operations for manufacturing coated panels and measuring their colors using a color meter.
In the field of automobile repair coating, it is becoming more and more common to adopt a computer color matching method (computer color matching; CCM) using a color sensor and a computer for the purpose of standardizing a color matching operation and shortening an operation time. The computer toning method does not require a high level of toning skill, and therefore is a method by which anyone can tone simply and quickly, and is a method that is widely spread to contribute to an increase in overall productivity.
Computer Color Matching (CCM) is a method of inputting data such as characteristic values of respective color matching materials into a computer in advance, measuring colors of a vehicle body to be repaired with a color sensor to obtain various data, calculating a blending ratio of the color matching materials with the computer based on the data, weighing and mixing 1 or more color matching materials based on the obtained blending ratio to produce a colored paint, and coating the obtained colored paint on a base material and drying the paint to produce a color matching test coated plate.
The prepared color matching test coating plate is used for color matching by a color meter and/or color matching with the periphery of the repaired part. If the result is not good, the matching of the toning materials is corrected or toning is corrected according to the feeling of the operator by recalculating the computer based on the color measurement data of the manufactured toning test coating plate and the like, and the toning test coating plate is manufactured again, and the color of the toning test coating plate is measured by a color meter and/or is compared with the color around the repaired part, and the operation is repeatedly carried out until the color is qualified.
In an actual repair coating site, for example, in the repair coating of an automobile outer panel or the like, the following method is adopted: after filling the damaged portion with a putty or a primer, a colored paint in which 1 or more kinds of toning materials are mixed and toned to a target color is applied with the periphery of the damaged portion as the center, and a varnish is applied thereon. The target color is a color around the repaired portion, and may be a color tone that changes from a color tone when the vehicle is new due to the influence of sunlight or the like, and therefore, in order to obtain an appearance that is consistent with the color around the repaired portion without giving a sense of incongruity, it is necessary to manufacture a plurality of color-mixing test coated plates having a multi-layer coating film, measure the color, and perform a colorimetric operation.
Therefore, in order to obtain an appearance in which the color of the coated portion is uniform with the surrounding and the appearance is not unpleasant, it is necessary to continue the following operations until a multilayer coating film of a target color is obtained: a color test coated sheet is produced by forming a colored coating film on the basis of a colored paint obtained by mixing 1 or more kinds of color matching materials by a computer color matching method to match colors to a target color, and coating a clear coating film on the colored coating film to form a clear coating film, and the obtained color test coated sheet is subjected to color measurement by a color meter and/or color comparison with the periphery of a repaired portion.
Therefore, in the automotive refinish coating, in order to improve productivity by standardizing the toning operation and shortening the toning time, a method is required which can perform highly accurate color measurement in a shorter time.
The color measurement of a multi-layer coating film-coated color test sheet, particularly a multi-layer coating film-coated color test sheet having a transparent coating film on a colored coating film, has a problem that the color measurement value differs from the actual color of the multi-layer coating film when the color measurement is performed without the transparent coating film, when a material different from the transparent coating film actually used is applied or stuck, or the like.
In particular, in the case of a multilayer coating film having a colored coating film formed from a bright coating material such as a metallic paint containing a bright pigment, since the difference between the color tone of only the colored coating film as a single film and the color tone at the time of forming the multilayer coating film is significant, it is difficult to perform color measurement with high accuracy unless color measurement is performed in a state of a multilayer coating film having a transparent coating film to be actually used.
In addition, a 2-liquid type urethane varnish composed of a main component and a curing agent is often used as a varnish for obtaining a transparent coating film at a repair coating site.
In adjusting such a 2-liquid type urethane varnish, it is necessary to properly meter and mix the main agent and the hardening agent separately, and sintering hardening is time-consuming, thus requiring much effort and time.
In particular, in the case of producing a plurality of palette test coated plates having a multilayer coating film, since a step of sintering and hardening the multilayer coating film (and a subsequent cooling step) requires a lot of time, it is conceivable to omit the step of sintering and hardening the multilayer coating film in order to improve productivity by shortening the palette time.
However, in the case of a multilayer coating film having a colored coating film formed from a bright coating material such as a metallic coating material containing a bright pigment, if the transparent coating film is insufficiently dried, a mixed layer is formed from a solvent remaining in the coating film, and a tack-back unevenness such as an alignment disorder of the bright pigment such as an aluminum pigment occurs, which may degrade the finished appearance and may fail to obtain an accurate colorimetric value.
Further, if the coated plate (tinting test coated plate) is subjected to color measurement with a contact colorimeter in a state where the transparent coating film is not dried after the varnish application, the undried paint adheres to the colorimeter, it takes time to clean the contaminated colorimeter, and volatile components remaining on the undried coating film deteriorate parts of the colorimeter, so that it is impossible to stably perform continuous color measurement with the contact colorimeter.
A method of measuring color of a coated plate (a color test coated plate) with a non-contact colorimeter in a state where a transparent coating film is not dried can be considered, but a large-sized apparatus for performing stable color measurement under the same conditions is required, and there is room for improvement in color measurement accuracy such as variation in measurement conditions without using such an apparatus.
Further, there is still a problem of deterioration of parts of the colorimeter due to volatile components, and when the toner particles erroneously come into contact with an undried coating film, the parts are contaminated, resulting in problems such as cleaning.
Under such circumstances, the following proposals have been made up until now.
This toning method does not use spray coating as a means for applying a colored paint, and therefore has the problem that when the actual means for applying is spray coating, the correlation between colors is poor and toning is difficult. Further, since the transparent dry film is formed by heating (140 ℃ C., 20 minutes) after the varnish is applied, there is a problem in that productivity is improved because the operation time including heating time and cooling time is shortened.
Patent document 4 describes a color measuring device for a liquid film, which measures a color of a liquid film before drying and curing in order to manage a color of a coating material, the color measuring device including: the liquid film forming apparatus includes a liquid film forming unit for forming a liquid film having a predetermined thickness on the surface of a liquid film forming substrate, and a color measuring unit for measuring the color of the liquid film in a non-contact manner at a position close to the surface of the liquid film, adjacently disposing the liquid film and having a transfer unit below the liquid film forming unit, and transferring the liquid film forming substrate from the liquid film forming unit to the color measuring unit.
This apparatus can perform high-precision color measurement of a liquid film of an undried coating film not only by using a non-contact type colorimeter but also by using a contact type colorimeter, but the apparatus is complicated in configuration and the color measurement operation is complicated.
Further, there is no description effective for a multilayer coating film having a colored coating film formed from a bright coating material such as a metallic coating material containing a bright pigment. Further, particularly in a colored coating film formed from a metallic paint containing a bright pigment and a multilayer coating film having a transparent coating film provided on the colored coating film, since a significant difference occurs in color tone, unevenness, and the like, if color measurement is not performed in a state of a multilayer coating film having a transparent coating film, particularly in a coated sheet (a palette test coated sheet) having a multilayer coating film of a metal, highly accurate color measurement may not be possible.
Further, since a spray coating device is not used, there is a problem that when the actual coating means is spray coating, color correlation is poor and toning is difficult.
Patent documents 5 and 6 describe that when a color measurement operation is performed with respect to a color measurement object by an integrating sphere spectrophotometer, a mask member is pressed against the color measurement object to perform color measurement. The mask member is also called a target mask or the like, and a window portion defining a size of a region (color measurement target region) to be a color measurement target in a color measurement target object is provided in a mask main body portion, and a mounting portion by which the mask member can be attached to and detached from the color meter is provided.
However, the integrating sphere spectrocolorimeters described in patent documents 5 and 6 are not generally used for color measurement of a multilayer coating film having the following colored coating films: a colored coating film formed of a bright material such as a metallic paint containing a bright pigment for automobiles which is formed into a different hue or lightness depending on the angle of observation by the bright material. The technology relating to such an integrating sphere spectrocolorimeter is applied to a multi-angle system multi-angle spectrocolorimeter having a different colorimeter mechanism, and is neither described nor suggested in patent documents 5 and 6, and is difficult in view of technical common knowledge.
Further, details of the material and thickness of the masking member are not known, and volatile components remaining in the undried coating film may deteriorate members of the colorimeter, and the like, and may cause variations between the measured values of the colorimeter and the actual colors.
Further, when the color measurement is performed by bringing the mask member into contact with the undried coating film, there are problems that it takes time to clean the mask member having a complicated structure, a plurality of expensive mask members are required, and cost is disadvantageous.
Prior Art
Patent document
Japanese patent application laid-open No. 2001-336981 (Japanese patent application laid-open)
Japanese patent application laid-open No. 2004-305987
Patent document 4 Japanese patent application laid-open No. 4-370721
Patent document 5 Japanese patent laid-open publication No. 2016-90537
Japanese patent application laid-open No. 2015-215239
The present invention is to solve the above problems, and provides a method for measuring color of a coated sheet, comprising: in a method for measuring color of a coated plate having a multilayer coating film comprising a colored coating film formed of a colored paint and a clear coating film formed of a varnish, the multilayer coating film equivalent to that in an actual repair process can be simply and quickly measured with high accuracy without contaminating a colorimeter.
The present inventors have conducted intensive studies to solve the above problems and found that the above problems can be solved by the following constitution, and thus completed the present invention.
Specifically, as described below.
Item 1: a method for measuring a color of a coated sheet having a multi-layer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a varnish, comprising:
(1) a step of forming a colored coating film by applying a colored paint,
(2) a step of applying a varnish to the colored coating film to form a transparent coating film,
(3) and measuring color from the surface of the clear coat film with a color meter within 5 minutes after the clear coat film is formed, in a state where at least a protective sheet with the color measuring region of the coating sheet opened is present between the surface of the clear coat film and the color meter.
Item 2: a method for measuring a color of a coated sheet having a multi-layer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a varnish, comprising:
(1) a step of forming a colored coating film by applying a colored paint,
(2) a step of applying a varnish to the colored coating film to form a transparent coating film,
(3) and a step of performing color measurement with a color meter from the surface of the clear coat film in a state where a protective sheet in which at least the color measuring region of the coating sheet is opened is present between the surface of the clear coat film in a non-completely dried state and the color meter.
Item 3: the method for measuring a color of a coated sheet according to item 1 or 2, comprising a step of leaving the transparent coating film formed in the step (2) at a temperature of 15 to 80 ℃.
Item 4: the method for measuring a color of a coated sheet according to any one of items 1 to 3, comprising a step of setting a solid content of the transparent coating film to 40 to 100 mass%.
Item 5: the method for measuring a color of a coated sheet according to any one of claims 1 to 4, wherein the varnish is a urethane curable coating material containing a hydroxyl group-containing compound and a polyisocyanate compound.
Item 6: the method for measuring a color of a coated sheet according to any one of items 1 to 5, wherein a glass transition temperature of the transparent coating film after drying is 50 ℃ or higher.
Item 7: the method for measuring a color of a coated sheet according to any one of items 1 to 6, wherein a dry film thickness of the transparent coating film is in a range of 10 to 50 μm.
Item 8: the color measurement method of a coated sheet according to any one of claims 1 to 7, wherein the step of forming the colored coating film includes at least 1 step of a step of forming the colored coating film by spray coating, a step of leaving the colored coating film standing, and a step of applying preliminary heating to the colored coating film.
Item 9: the method of measuring color of a coated sheet according to any one of claims 1 to 8, wherein the protective sheet has a thickness in the range of 10 to 200 μm.
Item 10: the method of measuring color of a coated sheet according to any one of claims 1 to 9, wherein an adhesive layer is provided on at least 1 surface of the protective sheet.
Item 11: a method of measuring color using the coated plate according to any one of items 1 to 10, wherein the colored paint is a color-mixing paint in which 1 or more pigment-containing materials are mixed and color-mixed to a target color, and the method includes a step of measuring color of a color-mixing test coated plate coated with the color-mixing paint by the color-measuring method and determining whether or not the color-mixing of the color-mixing paint is acceptable.
In addition, "drying" in the present specification includes, unless otherwise specified, not only drying by volatilization of a volatile solvent (a state of no fluidity, etc.) but also curing drying by progress (completion) of a curing reaction.
According to the method for measuring color of the coated plate of the present invention, the color can be measured by using the conventional color meter, and the color meter can be protected from the contamination due to the volatile matter and the adhesion of the undried paint, so that anyone can use the method easily, and the toning time and the color measuring operation time can be shortened. In addition, the protective sheet used in the method is not an expensive auxiliary member with a complicated structure, but a member which is relatively cheap and can be replaced or used once, and the colorimeter can be protected simply.
In addition, even if the obtained coating film is a multilayer coating film affected by the variation in tack-back or the like, that is, a multilayer coating film containing a bright coating film formed from a bright paint containing a bright pigment which is liable to vary in color measurement data, the present method is designed in view of this, and therefore, a multilayer coating film equivalent to an actual repair process can be subjected to color measurement with high accuracy in a short time regardless of the color of the coating film.
In particular, in the case of a repair coating for an automobile using a color sensor and a computer-based toning method using a computer, a suitable method for measuring the color of a paint sheet is provided as a method for measuring the color of a toning test paint sheet in order to determine whether or not the toning ratio of a toning paint, which is toned to a target color by mixing materials including 1 or more kinds of coloring paints, is acceptable.
Further, by using the method for measuring color of the coating plate, high-precision color measurement can be performed in a short time, and it is possible to quickly determine whether or not the toning composition of the toning paint is acceptable, so that it is possible to standardize the toning operation, particularly to greatly shorten the toning time.
Drawings
Fig. 1 is a view illustrating one embodiment of a protective sheet used in the present invention.
Fig. 2 is a diagram illustrating an embodiment of a color measurement state by the color measurement method of the coated sheet of the present invention.
Fig. 3 is a view illustrating an embodiment in which the protective sheet of the present invention is attached to a colorimeter.
Detailed Description
The present invention is described in detail below.
< 1. color measurement method >
[1.1 colored coating; colored coating film ]
The colored paint used in the method for measuring color of a coated sheet of the present invention can be any colored paint widely used in the paint field, including 1-liquid type, 2-liquid type, aqueous type, nonaqueous type, photo-curing type, and thermosetting type.
For example, a colored coating material used for forming a multilayer coating film on a product such as: outer panel portions of automobile bodies such as passenger cars, trucks, motorcycles, and passenger cars; automotive parts; and an outer panel portion of a household electrical appliance product such as a cellular phone and an audio device.
Examples of the colored coating material in the present invention include a solid color coating material, a metallic coating material, and a light interference coating material.
Further, as such a colored paint, a color-mixing paint in which 1 or more kinds of colored paints are mixed and color-mixed to a target color may be used.
As the material contained in the colored coating material, 1 or more species widely known as components of the colored coating material constituting the following formulation are listed: binders, binders (resins, curable compounds, etc.), coloring pigments or pastes thereof, luster pigments or pastes thereof, coloring agents such as gloss control agents and dispersing (assisting) agents, and additives.
As these colored paints, various commercially available products such as "Retan PG Hybrid Eco" and "Retan WBeco EV" manufactured by Kyoto paint Co., Ltd can be used.
The color of the colored coating material may be black, white, red, green, yellow, blue or violet, or any combination of these colors may be used to give a desired color. The colored coating material may be a coating material containing 1 or more of an inorganic colored pigment, an organic colored pigment and a luster pigment as a colored pigment.
Among them, as the bright pigments, 1 or more kinds of bright pigments such as scaly metal pigments of aluminum, copper, chromium, nickel alloy, stainless steel, etc., scaly metal pigments whose surface is coated with metal oxides, light-reflective pigments such as scaly metal pigments whose surface is chemically adsorbed or bonded with a coloring pigment, and/or light-interference pigments such as metal oxide-coated mica pigments, metal oxide-coated aluminum oxide flake pigments, metal oxide-coated glass flake pigments, metal oxide-coated silica flake pigments, etc., can be used.
[1.2 varnish; clear coating film ]
The varnish used in the color measurement method of the coated sheet of the present invention can be any varnish widely used in the field of paints, including 1-liquid type, 2-liquid type, aqueous, non-aqueous, photo-curable, photo-and thermo-curable, and volatile paints (such as clear paints).
The varnish may be a top layer varnish used as the uppermost layer, or a varnish in which a transparent coating film is formed by further providing a coating film on the transparent coating film.
As the varnish, a completely colorless and transparent paint may be used, or a color varnish in which a coating film is colored in a range in which the transparent state can be maintained may be used.
Among them, a varnish used for forming a multilayer coating film on a product such as: outer panel portions of automobile bodies such as passenger cars, trucks, motorcycles, and passenger cars; automotive parts; and an outer panel portion of a household electrical appliance product such as a cellular phone and an audio device.
As such a varnish, a varnish type varnish capable of forming a dry coating film by removing a volatile solvent, a curable varnish capable of forming a dry coating film by mixing a base compound and a curing agent, and the like are preferably used.
The varnish type varnish capable of forming a dry coating film by removing the volatile solvent may be an aqueous varnish containing water as a volatile solvent or a non-aqueous varnish containing an organic solvent as a volatile solvent.
The curable varnish capable of forming a dry coating film by mixing the main agent and the curing agent may be a 1-liquid type paint, a 2-liquid type paint, or any other multi-liquid type paint, such as a water-based paint, a non-water-based paint, a powder paint, an aerosol paint, or the like.
Particularly, a urethane curable coating material containing a hydroxyl group-containing compound and a polyisocyanate compound is preferably used.
As the hydroxyl group-containing compound, any compound can be used as long as it contains 2 or more hydroxyl groups. Examples thereof include ethylene glycol, diethylene glycol, propylene glycol, 1, 3-propanediol, tetraethylene glycol, triethylene glycol, dipropylene glycol, 1, 4-butanediol, 1, 3-butanediol, 2, 3-butanediol, 1, 2-butanediol, 3-methyl-1, 2-butanediol, 2-butyl-2-ethyl-1, 3-propanediol, 1, 2-pentanediol, 1, 5-pentanediol, 1, 4-pentanediol, 2, 3-dimethylpropanediol, tetramethylene glycol, 3-methyl-4, 3-pentanediol, 3-methyl-4, 5-pentanediol, 2, 4-trimethyl-1, 3-pentanediol, 1, 6-hexanediol, ethylene glycol, propylene, Low molecular weight polyol compounds such as diols including 1, 5-hexanediol, 1, 4-hexanediol, 2, 5-hexanediol and neopentyl glycol, and triols including glycerin; and polymer polyols such as acrylic polyol, polyether polyol, polyester polyol, polyurethane polyol, polycarbonate polyol, and epoxy polyol.
These hydroxyl group-containing compounds may be used alone or in combination of 2 or more.
The hydroxyl value of the hydroxyl group-containing compound and the weight average molecular weight of the polymer polyol may be appropriately selected from the viewpoints of crosslinking density, scratch resistance, water resistance, acid resistance, smoothness and the like.
The hydroxyl group-containing compound in the varnish used in the present invention is preferably at least 1 polymer polyol, particularly preferably 1 or more of acrylic polyol, polyester polyol and polyether polyol, and more preferably acrylic polyol.
As the polyisocyanate compound, any compound can be used as long as it has at least 2 isocyanate groups in 1 molecule. Examples thereof include aliphatic diisocyanates such as hexamethylene diisocyanate and trimethylhexamethylene diisocyanate; cyclic aliphatic diisocyanates such as hydrogenated xylylene diisocyanate, isophorone diisocyanate, and cyclohexane diisocyanate; aromatic aliphatic diisocyanates such as xylylene diisocyanate; aromatic diisocyanates such as tolylene diisocyanate and 4,4' -diphenylmethane diisocyanate; polyisocyanate compounds having 3 or more isocyanate groups such as triphenylmethane-4, 4',4 ″ -triisocyanate, 1,3, 5-triisocyanatophenyl, 2,4, 6-triisocyanatotoluene, 4' -dimethyldiphenylmethane-2, 2',5,5' -tetraisocyanate and the like; polyisocyanate polymers such as polyurethane polyisocyanate, polyether polyisocyanate and polyester polyisocyanate; derivatives of the polyisocyanates, and the like.
Examples of the derivative of the polyisocyanate include polymers such as dimers and trimers of the above-mentioned polyisocyanate, biuret, allophanate, uretdione (uretdione), uretonimine, isocyanurate, oxadiazinetrione, polymethylene polyphenyl polyisocyanate (natural diphenylmethane diisocyanate (Crude MDI), Polymeric diphenylmethane diisocyanate (Polymeric MDI)), and natural toluene diisocyanate (Crude TDI).
Further, as the polyisocyanate compound, a blocked polyisocyanate compound which is a blocked compound in which an isocyanate group in the polyisocyanate and the derivative thereof is blocked with a blocking agent may be used.
These polyisocyanate compounds and derivatives thereof may be used alone or in combination of 2 or more.
In the varnish, if necessary, a solvent such as water or an organic solvent, a curing catalyst, an antifoaming agent, an ultraviolet absorber, and other additives may be appropriately blended.
From the viewpoint of improving the color measurement workability, the glass transition temperature of the transparent coating film after drying is preferably adjusted to 50 ℃ or higher. The glass transition temperature is preferably 60 to 100 ℃, and more preferably 60 to 80 ℃.
The glass transition temperature of the clear coating film of the present invention is a dynamic glass transition temperature measured as a temperature showing a maximum value of tan δ (loss modulus/storage modulus) in a dynamic viscoelasticity measurement using an FT rheological spectrum "Rheogel E-400" (manufactured by UBM Co., Ltd.) at a frequency of 110 Hz and a temperature rise rate of 4 ℃/min. The transparent composition used in the present invention was applied to a polypropylene plate in a dry film thickness of 25 μm, a dry coating film was formed under drying conditions of 80 ℃ for 20 minutes, and then the obtained dry coating film was peeled off from the polypropylene plate as a free coating film, and cut into a sample in the form of a short strip having a length of 20mm and a width of 5mm at the edge or at the portion without a defect.
In the present invention, when a tone test coated plate is produced by using a urethane curable coating material containing a hydroxyl group-containing compound and a polyisocyanate compound as a varnish, the tone test coated plate is particularly preferable because it can form a multilayer coating film having properties extremely close to those of a multilayer coating film formed in an actual repair coating step. The color measurement can be performed with high accuracy because it is almost the same as the color measurement after actual repair coating, and the produced color matching test coated sheet is protected by a transparent coating film having urethane crosslinking bonding, is excellent in water resistance, is less in discoloration and deterioration (film thinning) with time, and can be reused as a color sample sheet.
In one embodiment of the present invention, in a state where at least the protective sheet having the color measurement area of the coating sheet opened is present between the surface of the clear coating film and the colorimeter, color measurement is performed with the colorimeter from the surface of the clear coating film within 5 minutes, preferably within 3 minutes, and more preferably within 1 minute after the formation of the clear coating film.
Therefore, even when color measurement is performed by adjusting the composition of the varnish in this manner, at least the characteristics of not causing the tack-back unevenness are required.
In one embodiment of the present invention, color measurement is performed by a color meter from the surface of the clear coat film in a state where a protective sheet in which at least the color measurement region of the coating sheet is opened is present between the surface of the clear coat film in an incompletely dried state and the color meter.
Therefore, even when color measurement is performed by adjusting the composition of the varnish in this manner, at least the characteristics of not causing the tack-back unevenness are required.
In the method for measuring the color of the coated sheet of the present invention, the transparent coating film formed by coating the varnish may be left at a temperature of 15 to 80 ℃ from the time after the varnish coating to the time of color measurement.
The transparent coating film formed by applying the varnish may have a solid content of 40 to 100 mass%, preferably 40 to 99 mass%, and more preferably 45 to 90 mass% in color measurement.
The transparent coating film formed by applying the varnish can be left at a temperature of 15 to 80 ℃ from the time of varnish application to the time of color measurement, and the solid content of the transparent coating film in the color measurement can be 40 to 100 mass%.
As means for setting the solid content of the transparent coating film at the time of color measurement to 40 to 100 mass%, appropriate coating film drying means such as heating means may be employed if necessary.
The time for setting the solid content of the clear coating film to 40 to 100 mass% is not particularly limited, but the time is preferably adjusted by adjusting the components of the varnish within 5 minutes, preferably within 3 minutes, and more preferably within 1 minute after the formation of the clear coating film.
The clear coat coating may be performed by optionally leaving it to stand and/or heating, and the solid content of the obtained clear coating film may be 40 to 100% by mass.
When the solid content of the clear coating film is 40% by mass or less, the following problems may occur: the occurrence of tack-back unevenness, the transparent coating film passing through the opening of the protective sheet and reaching the colorimeter, and the colorimeter being contaminated by volatile components such as organic solvents contained in the transparent coating film.
When the solid content of the clear coating film exceeds 90 mass%, particularly 99 mass%, it takes too much time from the formation of the clear coating film to the color measurement in the case of a normal varnish. Further, when the drying is accelerated at a high temperature (for example, more than 80 ℃) to obtain a transparent coating film, there is a possibility that a problem such as difficulty in forming a multilayer coating film having a transparent coating film which is uniform and excellent in color stability occurs.
In the present specification, the solid content (% by mass) of the transparent coating film at a predetermined time is also referred to as the solid content of the coating material applied to the object (coating NV) by the following equation.
The content of solid content of the transparent coating film is (m)2-m0)/(m1-m0)×100
m0: mass (g) of coated article before coating
m1: mass (g) of coating at a given point in time
m2: mass (g) of coating material having dried coating film with completely volatilized solvent
The dry film thickness of the transparent coating film is not particularly limited, but is usually within the range of 10 to 50 μm, preferably 20 to 40 μm, and more preferably 25 to 35 μm.
[1.3 means for coating; method for Forming coating film
As the coating means and the method for forming a coating film used in the method for measuring color of a coated sheet according to the present invention, a coating method widely used in the field of coating materials can be used without limitation.
As the means for applying the colored paint and/or varnish used in the method for measuring color of a coated sheet of the present invention, for example, 1 or more means such as air spraying, airless spraying, electrostatic spraying, rotary atomization, brush coating, roll coating, ink jet, aerosol, dipping, etc. can be used, and the application can be carried out 1 time or repeated multiple times.
As a preferable coating means, spray coating such as air spray, airless spray, electrostatic spray, and rotary atomization can be employed.
When a colored coating material is applied to a substrate, when a contaminant (oil or the like) contaminates the substrate, it is preferable to degrease and clean the substrate using a solvent such as alcohol, and when the substrate is cleaned, the substrate can be cleaned without particularly degreasing and cleaning.
In order to improve the adhesion and adhesion between the substrate and the coating film, the substrate may be subjected to surface treatment such as roughening treatment, plasma treatment, flame treatment, primer treatment, and the like.
After the colored paint or varnish is applied, the coating may be left to stand (left to stand) and/or preheated. The storage is usually performed by standing at room temperature, and the heating temperature, heating time, and the like in the case of preheating can be arbitrarily set. In some cases, forced drying may be performed by using a blower or the like.
As the substrate of the coated sheet, a substrate generally used in the production of coated sheets can be used, and various metal sheets, inorganic material sheets such as glass, various plastic sheets, cardboard, and the like can be used.
The substrate of these coated sheets may be one subjected to surface treatment such as phosphate treatment, chromate treatment, plating treatment, composite oxide treatment, electrodeposition coating treatment, primer treatment, degreasing treatment, and the like.
[1.4 colorimeter; color measurement procedure
As the colorimeter used in the method for measuring color of a coated sheet according to the present invention, a colorimeter widely used for color management and/or color measurement of industrial products having a colored surface can be used without limitation. Examples thereof include an integrating sphere spectrophotometer, a multi-angle spectrophotometer, and the like, but are not particularly limited.
The following multi-angle spectroscopic colorimeter can be preferably used: in order to cope with color measurement of a brilliant coating film (metal coating film), light is incident from one direction in 1 measurement and received at a plurality of angles of 3 to 6 angles (for example, 25 °, 45 °, and 75 °).
Particularly, an AI COLOR sensor, a Tri-COLOR multi-angle spectrocolorimeter manufactured by BYK JAPAN, and the like are preferably used.
In the present invention, L can be obtained by using such a colorimeter＊a＊b＊L representing lightness in color space＊And chroma a representing hue and chroma＊And b＊The value of (c). Also, using these values, the color difference from the target color can be measured quickly.
Here, L＊a＊b＊The color space, which is used to represent the color of an object, is currently the most commonly used color system in all fields, and is standardized by the International Commission on illumination (CIE) in 1976, and is also adopted in JIS (JIS Z8781-4, Z8781-5) in Japan.
L＊a＊b＊In the color space, the chromaticity a representing the hue and chroma＊、b＊Direction of the color, a＊Indicating the red direction, -a＊Represents the green direction, and b＊Indicates the yellow direction, -b＊The color becomes brighter as the absolute value of the numerical value becomes larger and becomes darker as the absolute value becomes smaller, indicating the direction of blue. L representing lightness＊Taking a value of 0-100, L＊White when 100, L＊0 is black.
In one embodiment of the present invention, in a state where at least the protective sheet having the color measurement area of the coating sheet opened is present between the surface of the clear coating film and the colorimeter, color measurement is performed with the colorimeter from the surface of the clear coating film within 5 minutes, preferably within 3 minutes, and more preferably within 1 minute after the formation of the clear coating film.
In one embodiment of the present invention, color measurement is performed by a color meter from the surface of the clear coat film in a state where a protective sheet in which at least the color measurement region of the coating sheet is opened is present between the surface of the clear coat film in an incompletely dried state and the color meter.
Here, the term "incompletely dried state" of the transparent coating film provided by applying the varnish means a state in which the drying of the transparent coating film is not completely completed by heating for a long time or the like. That is, in the case where the varnish is a varnish type varnish containing no curing agent, it means that a volatile solvent (water, an organic solvent, or the like) in the varnish is not completely volatilized; in the case of a curable varnish in which a main component and a curing agent are mixed, the curing (crosslinking) is not completely completed.
In general, the state other than the "hardened and dried" state defined in JIS K5600-1 (1999) means a state in which there is no "the center of the coated surface is pinched strongly by the thumb and the index finger, the coated surface is not dented by the fingerprint, the movement of the coated surface is not felt, and the center of the coated surface is rubbed rapidly and repeatedly with the fingertip, and there is no wear mark on the coated surface".
Such a state may be, for example, a "dry-by-touch state" (a state in which the center of the coated surface is lightly touched with a fingertip and the fingertip is not stained) or a "dry-by-half state" (a state in which the center of the coated surface is lightly rubbed with a fingertip and no abrasion mark is generated on the coated surface) as defined in JIS K5600-1 (1999).
[1.5 protective sheet ]
The protective sheet used in the method for measuring color of a coated sheet according to the present invention is configured such that at least a color measuring range of the coated sheet is opened between a surface of a transparent coating film on the coated sheet and a colorimeter during coating and color measurement.
The opening provided in the protective sheet may have any shape as long as at least the colorimetric area of the coating plate is opened, and may have a circular shape, a quadrangular shape, or the like. It may be larger than the colorimetric range as long as the desired effect is obtained.
The opening of the protective sheet corresponds to a color measuring portion (sensor window, opening, etc.) provided in the color meter main body, and thereby, it is possible to directly irradiate the coating sheet with light from the light source of the color meter.
The protective sheet is present between the transparent coating film and the colorimeter, and has a function of preventing the transparent coating film from adhering to the colorimeter and contaminating the colorimeter, and a function of preventing the deterioration or damage of the colorimeter due to an organic solvent volatilized in the transparent coating film.
In addition, when the pollution of the protection sheet is serious, the protection sheet can be directly discarded because of low cost, and the protection sheet is also convenient to replace.
Further, since at least the color measurement area of the coating plate is opened and the opening is fitted to a color measurement portion (sensor window portion, opening portion, or the like) provided in the colorimeter main body, the actual multilayer coating film can be measured for color by directly irradiating light from the colorimeter light source.
The shape of the protective sheet is not particularly limited as long as the opening is provided, and other openings, cuts, and the like may be provided as long as the intended function is not impaired. Further, at least a part of the protective sheet may be formed into a desired shape by bending, molding, or the like. In view of cost and the like, a flat sheet-like protective sheet in which only the colorimetric region of the coating sheet is opened is preferable.
In particular, the sheet-like material has high versatility, can be easily processed into a desired shape as needed, and can be easily applied to various colorimeters.
The thickness of the protective sheet may be any thickness, but is usually 10 to 200 μm, preferably 20 to 150 μm, and more preferably 30 to 120 μm.
A protective sheet thinner than 10 μm may make handling of the protective sheet difficult or may be easily damaged, and may not prevent the influence of the solvent in the clear coating film on the colorimeter.
A protective sheet thicker than 200 μm absorbs light from the surroundings, and there is a possibility that accurate color measurement cannot be performed or that the color measurement value differs from the color of an actual multilayer coating film.
Examples of the material constituting the protective sheet include resins such as polyester resins, polyolefin resins, polyamide resins, polystyrene resins, acrylic resins, vinyl chloride resins, fluorine resins, cellulose resins, polyethylene resins, vinyl acetate resins, polycarbonate resins, and polyurethane resins, and plastic materials such as FRPs; metal materials such as aluminum foil, stainless steel foil, and copper foil; paper materials such as foreign paper (high-quality paper, coated paper, tracing paper, etc.), japanese paper (grass paper, sheet paper, etc.), cooking paper, cellophane, etc.; fiber materials such as woven cloth, nonwoven cloth, and knitted fabric; glass, wood, and the like.
The present invention may be a composition containing 2 or more of them, or a laminate having a layer containing 1 or more of them.
In the present invention, at least a part of at least one surface of the protective sheet may have an adhesive layer. The adhesive layer may be present on only one side or both sides, but is preferably present on one side. The adhesive layer may be provided over the entire surface of at least one surface of the protective sheet, or may be provided partially in accordance with a desired shape or the like.
Examples of protective sheets provided with such an adhesive layer include those in which an adhesive layer is provided on at least one surface of a plastic sheet (film), paper, metal, or the like to form an adhesive sheet or an adhesive tape (for example, Post-it (registered trademark) as a polyolefin resin adhesive film, a polyester resin adhesive film, or a paper-based adhesive sheet).
As the adhesive for forming the adhesive layer, any adhesive such as acrylic, rubber, silicone, urethane and the like can be used. These binders can be appropriately selected based on the following viewpoints: accurate fixation, influence on the colorimeter (prevention of glue residue at the time of peeling, prevention of separation of a colorimeter member at the time of peeling, prevention of erroneous operation of the colorimeter by an adhesive, and the like).
The presence of the adhesive layer allows the protective sheet to be reliably fixed to the colorimeter and/or the coating plate, thereby enabling continuous color measurement to be performed easily and accurately, and the protective sheet can be removed easily by utilizing the removability of the adhesive without affecting the colorimeter or the coating plate.
For example, a double-sided tape may be attached to the colorimeter and/or the protective sheet in advance, and the protective sheet may be fixed to the colorimeter and/or the coating plate by the double-sided tape.
In the present invention, from the viewpoints of durability against organic solvents used in varnishes, cost, influence on colorimeters, and the like, polyester resin films, polyolefin resin films, paper, polyester resin films provided with an adhesive layer on one side, polyolefin resin films provided with an adhesive layer on one side, paper provided with an adhesive layer on one side (for example, Post-it (registered trademark)), and the like can be preferably used as protective sheets.
< 2. color matching method >
The method of toning of the present invention is a toning method using the method of toning of a coated sheet according to the above 1, wherein the colored paint is a toning paint in which materials containing 1 or more pigments are mixed and toned to a target color, and the method includes the step of performing the toning of a toning test coated sheet coated with the toning paint by the toning method and further judging whether the toning matching of the toning paint is acceptable.
The method for measuring the color of the coated plate according to the above 1, wherein the measurement is not carried out after the formation of the multilayer coating film, followed by heating, complete drying and cooling. Therefore, in the toning method using the computer toning method, it becomes possible to continuously and rapidly measure colors with high accuracy for each coated board (toning test coated board) made of a plurality of kinds of toning paints for toning a target color.
The toning method according to the present invention using the method for measuring color of a coated sheet according to item 1 above can protect the colorimeter by a member which is not an expensive and complicated structural auxiliary member but a relatively inexpensive member, can be replaced easily, and can be used once. In addition, the color matching method can standardize color matching operation, shorten color matching time and color measuring operation time, is not influenced by back adhesion unevenness and the like, and can carry out color measurement on a multi-layer coating film which is the same as the multi-layer coating film in the actual repairing process in a short time with high precision, thereby being capable of quickly and accurately judging whether the color matching of the color matching coating is qualified.
In particular, in the case of the repair coating of an automobile using the computer toning method using a color sensor and a computer, it is preferable as a method for measuring color of a palette used for a toning test because it is judged whether or not the toning of a toning paint in which a target color is toned by mixing materials containing 1 or more kinds of coloring paints is acceptable.
Further, according to the toning method of the present invention, it is possible to quickly and accurately judge whether or not the toning of the toning paint is acceptable based on high-precision color measurement in a short time, and therefore, it is possible to standardize the toning operation, and particularly, it is possible to change the average number of times of toning from 5 to 2 in the toning operation when repairing 1 vehicle, thereby significantly shortening the toning time, for example, by about 60%.
Examples
The present invention will be described more specifically below with reference to specific examples. However, the present invention is not limited to these examples.
(production of Standard plate 1)
As a colored coating material, a coating material SV (urethane-curable coating composition containing a scaly aluminum pigment, manufactured by Kansai paint Co., Ltd.) toned to a silver color was applied as a colored coating material on a 10cm × 10cm base material (tin plate) by computer toning (computer color matching; CCM) in a form of a colored coating material having a target dry film thickness of about 20 μm by spray coating to form a colored coating film, and the film was left to stand at 20 ℃ for 5 minutes and dried by touch.
A clear varnish C1 (trade name "Retan PG Eco HS (high solid) clear (Q)" manufactured by Kansai paint Co., Ltd.) and a urethane curable varnish composition containing a hydroxyl group-containing acrylic resin and a polyisocyanate compound at an NCO/OH ratio of 1.2 were sprayed on the obtained colored coating film at a glass transition temperature (coating film Tg) of 55 ℃ to give a target dry coating film of 25 μm to obtain a coated plate having a multilayer coating film.
The resulting coated sheet was left at 20 ℃ for 5 minutes (standing), followed by heating at 60 ℃ for 30 minutes to produce a standard sheet 1.
(production of Standard plate 2)
A master plate 2 was produced in the same manner as in the production of the master plate 1 except that a paint BM (a urethane-curable paint composition containing a scaly aluminum pigment and a coloring pigment, manufactured by kansai paint co., ltd.) which was adjusted to a blue metallic color was used as a coloring paint species in place of the paint SV in CCM to form a colored coating film.
(production of Standard plate 3)
A master plate 3 was produced in the same manner as in the production of the master plate 1 except that a colored coating film was formed using a paint GS (a colored pigment-containing urethane curable coating composition manufactured by kansai paint company) as a colored paint type, which was toned to a solid color instead of the paint SV in CCM.
(color measurement of Standard Panel 1 to 3)
On the surfaces of the clear coating films of the standard plates 1 to 3, a colorimeter (multi-angle spectrocolorimeter; Tri-COLOR, manufactured by BYK JAPAN) was left standing, and L at 3 angles (25 degrees (highlight), 45 degrees (front), and 75 degrees (shadow)) were measured＊a＊b＊The obtained colorimetric data is used as a standard value.
When color measurement is performed, the coating film does not adhere to a colorimeter without using a protective sheet, and on the contrary, no mark or the like is formed on the coating film, and stable color measurement is possible.
(example 1)
On a substrate (tin-plated plate) of 10cm × 10cm, a paint SV for manufacturing the standard plate 1 was used as a kind of a coloring paint, and spray coating was performed in a form of a target dry film thickness of about 20 μm, thereby forming a coloring coating film. After leaving at 20 ℃ for 5 minutes to touch dry, varnish C1 for producing master plate 1 was sprayed thereon in the form of a dry coating film of 25 μm to obtain a coated plate having a multilayer coating film.
The coated plate having the obtained multilayer coating film was not left to stand, and the temperature condition after varnish coating was set to 60 ℃, and color measurement was performed by a color meter at a time point when 5 minutes passed after the varnish coating was completed.
In addition, in color measurement, the solid content of the transparent coating film was measured, the dried state of the transparent coating film was evaluated, the color measurement value by a color meter was evaluated, the appearance was evaluated by visual observation, and the color measurement workability was evaluated. The results are shown in Table 1.
Further, color measurement was performed by a colorimeter according to the following method.
The coated sheet having the multilayer coating film was placed horizontally, a multi-angle spectrocolorimeter (Tri-COLOR, manufactured by BYK JAPAN) having a protective sheet S1 having a predetermined opening attached thereto with an adhesive was placed on the surface of the multilayer coating film of the coated sheet, and L at 3 angles (25 ° (highlight), 45 ° (front face), and 75 ° (shade)) was measured with the multi-angle spectrocolorimeter in a state where the protective sheet having the predetermined opening was present on the surface of the multilayer coating film＊a＊b＊The value of (c).
(examples 2 to 42)
In example 1, the solid content of the clear coating film at a predetermined time point, the evaluation of the dry state of the clear coating film, the evaluation of the color measurement value by a colorimeter, the evaluation of the appearance by visual observation and the evaluation of the color measurement workability were carried out in the same manner as in example 1 except that the type of the colored paint, the type of the clear coating film, the target dry film thickness of the clear coating film, the coating film Tg (glass transition temperature) of the clear coating film, the temperature condition after the varnish coating, the elapsed time after the varnish coating was completed, the solid content of the clear coating film, the type of the protective sheet and the thickness of the protective sheet were each as shown in table 1. The results are shown in Table 1.
Comparative example 1
On a substrate (tin-plated plate) of 10cm × 10cm, a paint SV used for the production of the standard plate 1 was used as a kind of a coloring paint, and spray coating was performed in such a manner that a target dry film thickness was about 20 μm, thereby forming a colored coating film. The plate was left at 20 ℃ for 5 minutes to be touch-dried and then was heated at 60 ℃ for 30 minutes without being coated with varnish, thereby producing a coated plate according to comparative example 1.
The obtained coated sheet was subjected to color measurement with a color meter in the same manner as in example 1, and also subjected to evaluation of color measurement value with a color meter, evaluation of appearance by visual observation, and evaluation of color measurement workability. The results are shown in Table 1.
Comparative example 2
In example 1, the solid content of the clear coating film was measured at a predetermined time point, the dried state of the clear coating film was evaluated, the color value was evaluated by a colorimeter, the appearance was evaluated by visual observation, and the color workability was evaluated in the same manner as in example 1, except that the temperature conditions after the varnish coating and the elapsed time after the varnish coating were as shown in table 1. The results are shown in Table 1.
(comparative example 3)
In example 1, the solid content of the clear coating film was measured at a predetermined time point, the dried state of the clear coating film was evaluated, the color measurement value by a color meter was evaluated, the appearance was evaluated by visual observation, and the color measurement workability was evaluated in the same manner as in example 1 except that the temperature conditions after the varnish coating and the elapsed time after the varnish coating were respectively as shown in table 1 and that no protective sheet was used in the color measurement by a color meter. The results are shown in Table 1.
TABLE 1
In Table 1, the types of varnishes C1 to C6 and protective sheets S1 to S5 are as follows.
C1: "Retan PG Eco HS (high solids) clear (Q)" manufactured by Kyowa paint Co., Ltd; a urethane-curable varnish composition which comprises a hydroxyl group-containing acrylic resin and a polyisocyanate compound at an NCO/OH ratio of 1.2 and which has a coating film having a glass transition temperature (coating film Tg) of 55 DEG C
C2: a quick-drying urethane-curable varnish composition having a coating film with a glass transition temperature (Tg) of 70 DEG C
C3: a urethane-curable varnish composition having a coating film with a glass transition temperature (coating film Tg) of 40 DEG C
C4: a varnish composition comprising a hydroxyl group-containing acrylic resin and no hardener, wherein the glass transition temperature (Tg) of the coating film is 55 DEG C
C5: a varnish composition comprising a hydroxyl group-containing acrylic resin and no hardener, wherein the glass transition temperature (coating film Tg) of the coating film is 70 DEG C
C6: a varnish composition comprising a hydroxyl group-containing acrylic resin and no hardener, wherein the glass transition temperature (coating film Tg) of the coating film is 40 DEG C
S1: UV-screening transparent coating film manufactured by A-ONE corporation; the thickness is 70 mu m; adhesive with single side
S2: a transparent single-sided pressure-sensitive adhesive sheet film made of polyethylene terephthalate; thickness of 100 μm
S3: a transparent single-sided pressure-sensitive adhesive sheet film made of polyethylene terephthalate; thickness of 110 μm
S4: a transparent single-sided pressure-sensitive adhesive sheet film made of polyethylene terephthalate; thickness 150 μm
S5: strong adhesion Post-it (size 75 mm. times.75 mm) manufactured by 3M company; the thickness is 110 μm; adhesive with single side
S6: high quality paper (size 75mm x 75 mm); thickness of 110 μm
In table 1, the solid content of the clear coating film was measured, the clear coating film was evaluated for the dry state, the color measurement value by a color meter was evaluated, and the appearance by visual observation and the color measurement workability were evaluated as follows.
(measurement of solid content of clear coating film)
The solid content (mass%) of the clear coating film at a predetermined time point was obtained as follows.
An ABS substrate having a thickness of 100 mm. times.150 mm. times.3.0 mm was weighed to obtain a mass m of the substrate before coating0(g)。
The varnish was applied to the above-mentioned substrate in the form of a dry coating film having a film thickness as shown in Table 1, and then the coated substrate was weighed at a predetermined time point to obtain a coating material mass m at a predetermined time point1(g)。
The varnish was applied to the above-mentioned substrate in such a manner that the dry coating film had a film thickness as shown in table 1, and then left to stand at room temperature and 20 ℃ for 5 minutes (standing), followed by heating and drying at 60 ℃ for 30 minutes in a drying oven, to obtain a coated substrate having a dry coating film. Weighing the coating to obtain a solventMass m of the coating material volatilized completely2(g)。
Using these m0、m1And m2The solid content (mass%) of the clear coating film at a given time point was calculated by the following formula:
the content of solid content of the transparent coating film is (m)2-m0)/(m1-m0)×100
m0: mass of coated article before coating (g)
m1: coating quality (g) at a given time point
m2: coating quality (g) of dried coating film having complete volatilization of solvent
(evaluation of Dry State of clear coating film)
The dry state of the multilayer coating film was evaluated using a coating plate provided with the multilayer coating film according to the regulations of JIS K5600-1 (1999).
In the present invention, the relationship with the solid content of the transparent coating film is as follows.
5: the coating surface was hardened and dried (a state in which the center of the coating surface was firmly held between the thumb and forefinger, no depression caused by fingerprints was observed on the coating surface, no movement of the coating surface was observed, the center of the coating surface was rapidly rubbed with the fingertips repeatedly, and no grinding marks were observed on the coating surface). Solid content of clear coating film: 90% by mass or more.
4: semi-cured and dried state (state where no grinding mark was formed on the coated surface by lightly rubbing the center of the coated surface with a fingertip). Solid content of clear coating film: 75 to 90 mass%.
3: the finger was in a dry state (the center of the coated surface was touched with a fingertip, and the fingertip was not contaminated). Solid content of clear coating film: 60 to 75 mass%.
2: the touch was made to be in a dry state (a state in which the center of the coated surface was touched with a fingertip and the fingertip was contaminated, but the color measurement was not performed and the color was measurable when the color meter was set). Solid content of clear coating film: 50 to 60 mass%.
1: touch the surface to a dry state or less (a state in which the center of the coated surface is touched with a fingertip and the fingertip is contaminated, and the color measurement is difficult because the color meter is set and moved). Solid content of clear coating film: 40 to 50 mass%.
0: the coating was in a dry state (uncured state immediately after coating). Solid content of clear coating film: 40% by mass or less.
(evaluation of color measurement value by colorimeter)
With respect to the coated sheets having the multilayer coating films of examples 1 to 42 and comparative examples 2 and 3, or the coated sheet having the colored coating film of comparative example 1, the L values at 3 angles (25 ° (highlight), 45 ° (front face), and 75 ° (shadow)) were measured from the surface of the multilayer coating film or the colored coating film, respectively, by a multi-angle spectrocolorimeter＊a＊b＊The value is obtained.
From the color measurement values of the respective coated sheets and the corresponding standard sheets manufactured using the same colored paint, the color difference Δ E between the respective coated sheets and the standard sheets at respective angles (25 ° (highlight), 45 ° (front face), 75 ° (shadow)) was obtained＊And evaluation of the colorimetric value was performed based on the following criteria.
◎ all Δ E＊The value is below 0.8
Good: all Δ E＊The value exceeds 0.8 and is 1 or less
Good quality, at least 1 △ E＊At most 1 kind of delta E＊Over 1
△ all Δ E＊A value exceeding 1 and being 2 or less
X: at least 1 kind of delta E＊Value exceeding 2
(evaluation of appearance by visual inspection)
Coated sheets having the multilayer coating films of examples 1 to 42 and comparative examples 2 and 3, or coated sheets having the colored coating film of comparative example 1 and corresponding standard sheets produced using the same colored coating material were placed side by side, and color tone, gloss, and unevenness were visually observed and compared, and evaluated according to the following criteria.
◎ the hue and gloss were well consistent with those of the standard plate, and no unevenness occurred.
Good: the color tone and/or the gloss were slightly different and/or slightly uneven from the standard plate, but actually the same level could be judged.
Good to: the color tone and/or gloss were confirmed to be slightly different from those of the standard plate and/or to be uneven, but at a level that is practically not problematic.
△, it was confirmed that the color tone and/or the gloss were different from those of the standard plate and/or were not uniform.
X: it was confirmed that there was a very significant difference from the standard plate in terms of hue and/or gloss and/or that very significant unevenness occurred.
(evaluation of color measurement operability)
The coated sheets having a multilayer coating film according to examples 1 to 42 and comparative example 2 or the coated sheet having a colored coating film according to comparative example 1 were placed horizontally, a multi-angle spectrocolorimeter (Tri-COLOR, manufactured by BYK JAPAN) in which a protective sheet having a predetermined opening portion described in table 1 was attached via the adhesive was provided on the surface of the multilayer coating film or the colored coating film of each coated sheet, and L values at 3 angles (25 ° (highlight), 45 ° (front surface), and 75 ° (shade)) were measured by the multi-angle spectrocolorimeter in a state where the protective sheet having the predetermined opening portion was present on the surface of the multilayer coating film or the colored coating film＊a＊b＊The workability of color measurement of the multilayer coating film or the colored coating film was evaluated according to the following criteria.
A coated plate having the multilayer coating film according to comparative example 3 was placed horizontally, and a multi-angle spectrophotometer (Tri-COLOR, manufactured by BYK JAPAN) having no protective sheet having a predetermined opening attached thereto was provided on the surface of the multilayer coating film of the coated plate, and L values at 3 angles (25 ° (highlight), 45 ° (front surface), and 75 ° (shadow)) were measured by the multi-angle spectrophotometer＊a＊b＊The workability of the multilayer coating film in color measurement was evaluated according to the following criteria.
◎ the color meter can be stably set without moving, and the transparent coating film or the colored coating film is not adhered to the color meter or the protective sheet.
Good: the colorimeter can be provided without moving or the like and color measurement can be performed. The transparent coating film and the protective sheet are slightly adhered to each other, but the transparent coating film and the protective sheet can be easily peeled off, and the protective sheet is slightly contaminated, and thus the protective sheet can be reused.
Good to: the colorimeter can be provided without moving or the like and color measurement can be performed. The transparent coating film sticks to the protective sheet, and the transparent coating film cannot be peeled from the protective sheet, or cannot be reused even if the protective sheet is peeled.
△, if the color meter is carelessly set, the movement and/or adhesion of the clear coat film to the protective sheet occur, and the protective sheet is seriously stained and cannot be reused.
X: it is difficult to perform color measurement, and the color meter is not set or stained due to the occurrence of a transparent coating film because the color meter is set to move significantly.
As described in the above examples, in the color measurement of a coated sheet having a multilayer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a clear varnish, when color measurement is performed from the surface of the clear coating film using a color meter within 5 minutes after the finish of the varnish coating in a state where a predetermined protective sheet is present between the surface of the clear coating film and the color meter, both the evaluation of the color measurement value by the color meter and the evaluation of the appearance by visual observation are extremely excellent, the evaluation of the color measurement workability is also excellent, and the same color measurement data as that of a standard sheet can be obtained.
Therefore, it becomes possible to start highly accurate color measurement in a short time for a multilayer coating film equivalent to the actual repair process.
In addition, in the color measurement of a coated sheet having a multi-layer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a varnish, when color measurement is performed from the surface of the clear coating film using a color meter in a state where a predetermined protective sheet is present between the surface of the clear coating film in a non-completely dried state and the color meter, both the evaluation of the color measurement value by the color meter and the evaluation of the appearance by visual observation are excellent, the evaluation of the color measurement workability is also excellent, and the same color measurement data as that of a standard sheet can be obtained.
Therefore, it becomes possible to start highly accurate color measurement in a short time for a multilayer coating film equivalent to the actual repair process.
Therefore, when a toning test coated plate for toning is produced and color measurement is performed using a varnish (urethane curable varnish composition) used in an actual repair process, it becomes possible to start high-precision color measurement in a short time for a multilayer coating film equivalent to that in the actual repair process.
Particularly, when the repair coating adjustment of the computer toning method with more manufacturing times and color measuring times of the palette coating test is used, whether the toning matching of the toning coating is qualified or not can be quickly and accurately judged, so that the toning operation can be standardized, and the toning operation time can be greatly shortened.
Comparative example 1 is an example without a clear coating film, and it was not possible to evaluate whether or not the color tone, gloss, and tack-back unevenness occurred when a multilayer coating film was formed by coating a varnish used in the actual repair process, and actually the evaluation by the colorimetric value of the colorimeter and the evaluation by visual appearance were deteriorated.
In comparative example 2, since the multi-layer coating film (clear coating film) of the coated sheet having the multi-layer coating film was in a cured and dried state substantially, neither evaluation of the colorimetric value nor visual evaluation of the appearance of the test piece was problematic, and workability was good without sticking the protective sheet, but productivity was not improved by shortening the working time.
Comparative example 3 is an example in which a protective sheet was not used, and when the colorimeter was placed on the coating film, movement occurred while the varnish adhered to the colorimeter, and therefore, the colorimetry operability was not good.
Description of the symbols
1 protective sheet
1-a opening part
1-b adhesive layer
2 colorimeter
3 coating plate
Claims (11)
1. A method for measuring a color of a coated sheet having a multi-layer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a varnish, comprising:
(1) a step of forming a colored coating film by applying a colored paint,
(2) a step of applying a varnish to the colored coating film to form a transparent coating film,
(3) and measuring color from the surface of the clear coat film with a color meter within 5 minutes after the clear coat film is formed, in a state where at least a protective sheet with the color measuring region of the coating sheet opened is present between the surface of the clear coat film and the color meter.
2. A method for measuring a color of a coated sheet having a multi-layer coating film including a colored coating film formed of a colored paint and a clear coating film formed of a varnish, comprising:
(1) a step of forming a colored coating film by applying a colored paint,
(2) a step of applying a varnish to the colored coating film to form a transparent coating film,
(3) and a step of performing color measurement with a color meter from the surface of the clear coat film in a state where a protective sheet in which at least the color measuring region of the coating sheet is opened is present between the surface of the clear coat film in a non-completely dried state and the color meter.
3. The method for measuring the color of a coated sheet according to claim 1 or 2, comprising the step of leaving the transparent coating film formed in the step (2) at a temperature of 15 to 80 ℃.
4. A color measurement method for a coated sheet according to any one of claims 1 to 3, comprising a step of setting the solid content of the transparent coating film to 40 to 100 mass%.
5. The method for measuring a color of a coated sheet according to any one of claims 1 to 4, wherein the varnish is a urethane-curable coating material containing a hydroxyl group-containing compound and a polyisocyanate compound.
6. The method for measuring a color of a coated sheet according to any one of claims 1 to 5, wherein a glass transition temperature of the transparent coating film after drying is 50 ℃ or higher.
7. The method for color measurement of a coated sheet according to any one of claims 1 to 6, wherein the dry film thickness of the transparent coating film is in the range of 10 to 50 μm.
8. The color measurement method of a coated sheet according to any one of claims 1 to 7, wherein the step of forming the colored coating film comprises at least 1 step of a step of forming the colored coating film by spray coating, a step of leaving the colored coating film standing, and a step of applying preliminary heating to the colored coating film.
9. The method of measuring color of a coated sheet according to any one of claims 1 to 8, wherein the protective sheet has a thickness in the range of 10 to 200 μm.
10. The method of measuring color of a coated sheet according to any one of claims 1 to 9, wherein an adhesive layer is provided on at least 1 surface of the protective sheet.
11. A method of measuring color using the coated board according to any one of claims 1 to 10, wherein the colored paint is a color-mixing paint in which 1 or more kinds of pigment are mixed and the color is mixed to a target color, and the method comprises a step of measuring color by the color-measuring method on a color-mixing test coated board to which the color-mixing paint is applied, and further judging whether or not the color-mixing ratio of the color-mixing paint is acceptable.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-168261 | 2018-09-07 | ||
| JP2018168261 | 2018-09-07 | ||
| JP2018-236214 | 2018-12-18 | ||
| JP2018236214A JP6503134B1 (en) | 2018-09-07 | 2018-12-18 | Method of measuring color of coated plate, and method of toning using the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110887566A true CN110887566A (en) | 2020-03-17 |
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| CN201910625725.2A Withdrawn CN110887566A (en) | 2018-09-07 | 2019-07-11 | Color measuring method for coated board and color mixing method using the same |
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| CN (1) | CN110887566A (en) |
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| CN116461245A (en) * | 2023-04-27 | 2023-07-21 | 宿迁学院 | Mixed mixing of colors equipment of fine arts design coating |
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| US20030185972A1 (en) * | 2000-03-16 | 2003-10-02 | Klaus Rieck | Method for removing minor lacquer imperfections |
| CN1500564A (en) * | 2002-11-12 | 2004-06-02 | 关西涂料株式会社 | forming method of pattern coating film and coating ornament |
| CN101021613A (en) * | 2006-02-14 | 2007-08-22 | 曾东 | Antipollution lens protective microscopes |
| CN104677715A (en) * | 2013-12-03 | 2015-06-03 | 北京有色金属研究总院 | Method for recording and observing corrosion behavior of magnesium alloy microstructure in situ |
| CN206920608U (en) * | 2017-07-17 | 2018-01-23 | 浙江之江工程项目管理有限公司 | A kind of hand-hold ranger with protective cover |
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| DE19960919C2 (en) * | 1999-12-17 | 2003-11-27 | Du Pont | Method and device for measuring optical parameters on liquid media |
| JP4121724B2 (en) * | 2001-09-04 | 2008-07-23 | コニカミノルタセンシング株式会社 | Reflection characteristic measuring device |
| JP4192048B2 (en) * | 2003-07-04 | 2008-12-03 | 日本ペイント株式会社 | Concealment rate calculation method, concealment rate quantification method, concealment rate calculation program, computer-readable storage medium, and concealment rate prediction apparatus |
| JP2005030923A (en) * | 2003-07-14 | 2005-02-03 | Kikusui Chemical Industries Co Ltd | Method for inspecting color of colored liquid |
| JP6255658B2 (en) * | 2012-08-28 | 2018-01-10 | マツダ株式会社 | Laminated coatings and painted products |
| JP6068238B2 (en) * | 2013-04-04 | 2017-01-25 | 関西ペイント株式会社 | Paint color evaluation panel and paint color evaluation panel kit |
| JP6985281B2 (en) * | 2016-10-12 | 2021-12-22 | 関西ペイント株式会社 | Computer-readable media including paint compounding data providing device, paint compounding data providing method, paint compounding data providing program, and paint compounding data providing program |
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2018
- 2018-12-18 JP JP2018236214A patent/JP6503134B1/en active Active
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- 2019-07-11 CN CN201910625725.2A patent/CN110887566A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030185972A1 (en) * | 2000-03-16 | 2003-10-02 | Klaus Rieck | Method for removing minor lacquer imperfections |
| CN1500564A (en) * | 2002-11-12 | 2004-06-02 | 关西涂料株式会社 | forming method of pattern coating film and coating ornament |
| CN101021613A (en) * | 2006-02-14 | 2007-08-22 | 曾东 | Antipollution lens protective microscopes |
| CN104677715A (en) * | 2013-12-03 | 2015-06-03 | 北京有色金属研究总院 | Method for recording and observing corrosion behavior of magnesium alloy microstructure in situ |
| CN206920608U (en) * | 2017-07-17 | 2018-01-23 | 浙江之江工程项目管理有限公司 | A kind of hand-hold ranger with protective cover |
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| Publication number | Publication date |
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| JP2020042000A (en) | 2020-03-19 |
| JP6503134B1 (en) | 2019-04-17 |
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Application publication date: 20200317 |