WO2009132857A1 - Procédé de mesure du voile de vernis sur des tableaux de contrôle - Google Patents

Procédé de mesure du voile de vernis sur des tableaux de contrôle Download PDF

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Publication number
WO2009132857A1
WO2009132857A1 PCT/EP2009/003156 EP2009003156W WO2009132857A1 WO 2009132857 A1 WO2009132857 A1 WO 2009132857A1 EP 2009003156 W EP2009003156 W EP 2009003156W WO 2009132857 A1 WO2009132857 A1 WO 2009132857A1
Authority
WO
WIPO (PCT)
Prior art keywords
cloudiness
measurement
measuring
color coordinates
color
Prior art date
Application number
PCT/EP2009/003156
Other languages
German (de)
English (en)
Inventor
Georg Wigger
Klaus Holzapfel
Christian Bornemann
Ingo Raupach
Original Assignee
Basf Coatings Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Basf Coatings Ag filed Critical Basf Coatings Ag
Publication of WO2009132857A1 publication Critical patent/WO2009132857A1/fr

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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
    • 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
    • G01J3/465—Measurement of colour; Colour measuring devices, e.g. colorimeters taking into account the colour perception of the eye; using tristimulus detection
    • 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
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/504—Goniometric colour measurements, for example measurements of metallic or flake based paints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/251—Colorimeters; Construction thereof

Definitions

  • the invention relates to a method for measuring the cloudiness of coatings on test panels.
  • the invention further relates to the use of the method for measuring the cloudiness of automobile finishes.
  • the surface quality in addition to the classic performance characteristics such as stone chip resistance, chemical resistance and scratch resistance is the primary quality criterion. It can particularly influence the purchase decision of the customer in the automotive sector, because the painted surface is crucial together with the shape the first impression that the customer wins, for example, from his new car.
  • test coatings are usually made, for which the term "test panel” has become natural, since the sample-coated object is often plate-shaped.
  • test panels there are also variously curved "test panels", e.g. if parts of car bodies are used or if just the paint properties are to be examined in curved zones.
  • the patent application WO 98/14778 A1 describes a method for measuring coated test panels, wherein the test panels are transferred from a gripping and moving device, for example a laboratory robot, to a measuring station.
  • a measurement of different coating properties is carried out by the laboratory robot with different measuring devices. For example, layer thickness, course, hue, the color coordinates L * (brightness), a * (red-green), b * (yellow-blue), hardness, haze and / or the gloss of the test panels can be measured.
  • WO 98/14778 A1 it is advantageous, according to WO 98/14778 A1, to use a color measuring device which supplies the color coordinates L *, a * b *, preferably at different observation angles.
  • WO 98/14778 A1 it is shown on the basis of the measurement of the brightness (color coordinate L *) of paint films that the visually clearly discernable differences in the cloudiness between the paint films could not be detected at an observation angle of 25 °, but only at viewing angles of 45 ° and / or 75 °.
  • This result, according to WO 98/14778 A1 proves the need for complete measurement data determination.
  • Voye color and lacquer (2000), 106 (10), pp. 34-40 also notes the existence of this problem.
  • the article describes an automated analysis system for determining surface data, e.g. the brightness (color coordinate L) and evaluation of paint surfaces. This particular paint batches can be checked.
  • visually recognizable cloud formation is not sufficiently recognized in the automated process (p.39, last paragraph).
  • the development of suitable evaluation algorithms for the analysis of the surface measurement data represents a further challenge (page 40, last column).
  • the known methods for instrumental assessment of cloudiness thus do not yet provide reliable and satisfactory results.
  • the object of the present invention was therefore to solve the long-known problem and to provide a method by which the cloudiness of coatings on test panels can be determined instrumentally.
  • the method is intended, in particular, for measuring the cloudiness of colorants and of effecting finishes, such as e.g. Metallic finishes, be suitable.
  • the method should be automated and have a high reproducibility of the results.
  • This object is surprisingly achieved by a method for measuring the cloudiness of coatings on test panels by measuring the color coordinates L * , a * and b * at at least 100 different measurement locations on a test panel each having at least 2 different observation angles, where (i) to each group of measured values obtained at a certain angle of observation for a specific color coordinate at different measuring locations, the standard deviation is determined, and
  • the color coordinates L * , a * and b * to be measured correspond to the coordinates of the ClELab color space of the CIE (Commission Internationale de l'eclairage). They are also called Farbbeck biologywar.
  • the coordinate L * describes the brightness of the hue, ie the position of the hue on the brightness axis.
  • the coordinates a * and b * describe the position of the hue in the color space on an axis between red and green (a *) or on an axis between blue and yellow (b *).
  • the measurement of the color coordinates L *, a * and b * can be carried out by means of methods known and suitable to the person skilled in the art.
  • spectrophotometers in particular multi-angle spectrophotometers, can be used as colorimeters.
  • Suitable instruments include the devices MA60 and MA68 from X-Rite ®.
  • the measurement of the color coordinates L *, a * and b * is preferably carried out by means of an automated measuring method.
  • the determination of the color coordinates can be carried out successively or simultaneously at different measurement locations on the test panel, without the test panel having to be removed from the measuring apparatus or manually reoriented for this purpose.
  • This can be enabled by a suitable automatic measuring device (e.g., laboratory robot with measuring station), as described, for example, in patent application WO 98/14778 A1.
  • the obtained measurement data are preferably acquired, stored, evaluated and / or displayed electronically.
  • the measurement of the color coordinates L * a * and b * is carried out in the inventive method at least 100 different measuring locations on the test panel.
  • the measurement is preferably carried out in each case at at least 150 different measurement sites, preferably at least 184 in each case and very particularly preferably at in each case 500 to 800 different measurement sites on the test panel.
  • the individual measuring locations have a minimum distance of 0.5 cm from each other.
  • the measuring points have a distance of 0.5 cm to 3.0 cm, especially preferably from 0.8 cm to 1, 2 cm from each other.
  • the different measuring locations are arranged in a rectangular grid at a distance of 1 cm in each case in the direction of the two mutually perpendicular axes of the grid.
  • the measuring locations are preferably within an area of 500 ⁇ 200 mm on the test panel.
  • the measurement of the color coordinates L *, a * and b * at the measuring locations takes place in the method according to the invention under at least two different observation angles, preferably at the observation angles of 15 ° and 25 °.
  • the measurement is carried out in each case at least 4 observation angles, preferably under at least 5 different observation angles.
  • the individual observation angles differ by at least 10 ° each.
  • the measurement of the color coordinates takes place in each case at the observation angles of 15 ° and 25 °.
  • the measurement of the color coordinates takes place at in each case 5 observation angles, preferably in each case under 10 ° -19 °, 20 ° -30 °, 40 ° -50 °, 70 ° -80 ° and 105 ° -115 °, very particularly preferably below 15 °, 25 °, 45 °, 75 ° and 110 °.
  • the illumination is preferably directed at an illumination angle (angle of incidence) of 45 °.
  • Wi, W 2 , ...., w m stand for the m different observation angles under which the color coordinates L *, a * and b * were respectively measured.
  • the sum S of the standard deviations serves as a measure of the cloudiness of the coating.
  • S the greater the cloudiness of the paint job.
  • the value of S as a measure of the cloudiness of a coating has a high reproducibility.
  • the deviation for the sum S of the standard deviations is usually below ⁇ 0.15 units.
  • the inventive method thus enables the automatable, instrumental determination of the cloudiness of coatings on test panels with high reproducibility of the results.
  • the method according to the invention is furthermore suitable for determining the cloudiness of coloring and of effecting coatings, such as e.g. Metallic finishes.
  • the finishes on the test panels are preferably coloring and / or effect finishes, particularly preferably effect-effecting metallic finishes.
  • Coloring finishes are understood to mean finishes which have been obtained from a pigment-containing coating composition. They contain, for example, white, colored and / or black pigments. Effect-giving coatings accordingly contain effect pigments, such as pearlescent or metallic effect pigments. Both coloring and effect paint finishes can also be used as part of a Multicoat paint present. In this case, the color and / or effect coating can be the topmost layer of the multicoat system, or it can be below a clearcoat. In all these cases, the inventive method for determining the cloudiness of the coating is suitable.
  • Another object of the invention is the use of the method for measuring the cloudiness of automotive coatings.
  • Automobacking is understood to mean coatings obtained from coating compositions which are suitable for the automotive industry.
  • Original painting in particular OEM painting, and / or automotive
  • the automotive coatings can be present for example on test panels, body parts or bodies.
  • the automotive finishes are preferably dye-colored and / or effect-based finishes, particularly preferably metallic finishes.
  • Coatings may also be present in the context of a multi-layer coating.
  • the process can be used, for example, in the development of improved coating materials, coating compositions or application processes for automotive finishing, in order to detect the cloudiness of the coatings achieved as a function of the altered experimental parameters.
  • the cloudiness of the paint achieved with a certain coating batch and / or a defined application process can be checked as part of a quality control.
  • the first application step of the basecoat was carried out by means of electrostatic spray application (ESTA) under high rotation atomization.
  • EcoBell device from Dürr was used with the following application parameters:
  • the device AGMD-Gun from DeVillbis was used with the following application parameters:
  • Grid track spacing 8 cm for 5-fold overlapping, or track spacing 13 cm for 3-fold overlapping
  • the spray width SB50% is understood to mean the spray pattern diameter (in cm) at 50% of the maximum layer thickness.
  • the track distance indicates the distance between the locations of the maximum layer thickness of two spray patterns in cm.
  • the dark blue or silver metallic basecoat was applied in each case with two different spray buttons (web spacing 8 cm and web spacing 13 cm), resulting in an average overlap of 5 or 3.
  • the cloudiness of the coatings obtained was detected after curing of the clearcoat by means of the method according to the invention.
  • an automatic measuring device according to WO 98/14778 A1 with a Angle spectrophotometer from the company X-Rite ® (MA60) used.
  • the color coordinates L * a * and b * were each measured at 4 different observation angles (15 °, 25 °, 45 °, 75 °) at 675 different measurement points on the painted test panel.
  • the measuring points were in a rectangular distance grid of 1, 0 cm x 1, 0 cm on an area of 15 x 45 cm.
  • Example 2 was carried out analogously to Example 1.
  • the cloudiness of four different basecoats (dark blue, silver, gray, beige) was determined as a function of the outflow rate of the paint in the pneumatic application. Notwithstanding Example 1, the pneumatic atomization was carried out with the following parameters:
  • Grid track distance 10 cm (for 4-fold overlapping)
  • Grid track distance 10 cm (for 4-fold overlapping)

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

Procédé de mesure du voile de vernis sur des tableaux de contrôle, par mesure de coordonnées chromatiques L*, a* et b* sur chacune d'au moins 100 sortes de mesure différentes sur le tableau de contrôle, à chaque fois sous au moins deux angles d'observation différents, caractérisé (i) en ce qu'on détermine l'écart-type, à chaque groupe de valeurs de mesure qui sont obtenues, pour différentes sortes de mesure, sous un angle d'observation déterminé pour une coordonnée chromatique déterminée, et (ii) en ce qu'on forme la somme des écarts-types ainsi obtenus, laquelle sert de mesure pour le voile de vernis.
PCT/EP2009/003156 2008-05-02 2009-04-30 Procédé de mesure du voile de vernis sur des tableaux de contrôle WO2009132857A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008022013.2 2008-05-02
DE102008022013A DE102008022013A1 (de) 2008-05-02 2008-05-02 Verfahren zur Messung der Wolkigkeit von Lackierungen auf Prüftafeln

Publications (1)

Publication Number Publication Date
WO2009132857A1 true WO2009132857A1 (fr) 2009-11-05

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PCT/EP2009/003156 WO2009132857A1 (fr) 2008-05-02 2009-04-30 Procédé de mesure du voile de vernis sur des tableaux de contrôle

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DE (1) DE102008022013A1 (fr)
WO (1) WO2009132857A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048147A1 (fr) * 2009-10-20 2011-04-28 Basf Coatings Gmbh Procédé de mesure de la turbidité de peintures sur des tableaux de contrôle
WO2012088200A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088199A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Carreau-témoin pour instruments de mesure des couleurs
WO2012088204A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088203A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088202A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
CN106323849A (zh) * 2016-08-05 2017-01-11 天津大学 衡量照明光源对传统绘画色彩损伤的检测及评价方法

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JPH05288690A (ja) * 1992-04-10 1993-11-02 Kansai Paint Co Ltd メタリツク塗膜の塗装ムラ決定方法
JPH09318448A (ja) * 1996-05-27 1997-12-12 Nissan Motor Co Ltd メタリック塗装の色ムラ判定装置および評価方法
DE19709406A1 (de) * 1996-09-30 1998-04-09 Basf Coatings Ag Verfahren und Vorrichtung zur Vermessung von lackierten Prüftafeln
DE19833859C1 (de) * 1998-07-28 2000-03-30 Basf Coatings Ag Verfahren zur Ermittlung der Farbtonstabilität von Lacken
US20040190768A1 (en) * 2003-03-31 2004-09-30 Yoshihiro Nonogaki Method for generating a formula for calculating mottling of a paint film, and a quantification method of the mottling
EP1508796A1 (fr) * 2003-08-22 2005-02-23 Rohm And Haas Company Méthode et appareil pour la détermination des couches soumise à des tests d'exposition
DE102004059186A1 (de) * 2004-12-08 2006-06-14 Byk Gardner Gmbh Verfahren und Vorrichtung zur ortsauflösenden Bewertung von Oberflächeneigenschaften

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Publication number Priority date Publication date Assignee Title
US4615902A (en) * 1985-09-03 1986-10-07 E. I. Du Pont De Nemours And Company Color panel standards sorting system
JPH05288690A (ja) * 1992-04-10 1993-11-02 Kansai Paint Co Ltd メタリツク塗膜の塗装ムラ決定方法
JPH09318448A (ja) * 1996-05-27 1997-12-12 Nissan Motor Co Ltd メタリック塗装の色ムラ判定装置および評価方法
DE19709406A1 (de) * 1996-09-30 1998-04-09 Basf Coatings Ag Verfahren und Vorrichtung zur Vermessung von lackierten Prüftafeln
DE19833859C1 (de) * 1998-07-28 2000-03-30 Basf Coatings Ag Verfahren zur Ermittlung der Farbtonstabilität von Lacken
US20040190768A1 (en) * 2003-03-31 2004-09-30 Yoshihiro Nonogaki Method for generating a formula for calculating mottling of a paint film, and a quantification method of the mottling
EP1508796A1 (fr) * 2003-08-22 2005-02-23 Rohm And Haas Company Méthode et appareil pour la détermination des couches soumise à des tests d'exposition
DE102004059186A1 (de) * 2004-12-08 2006-06-14 Byk Gardner Gmbh Verfahren und Vorrichtung zur ortsauflösenden Bewertung von Oberflächeneigenschaften

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048147A1 (fr) * 2009-10-20 2011-04-28 Basf Coatings Gmbh Procédé de mesure de la turbidité de peintures sur des tableaux de contrôle
WO2012088200A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088199A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Carreau-témoin pour instruments de mesure des couleurs
WO2012088204A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088203A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
WO2012088202A1 (fr) * 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Pavé de vérification pour instruments de mesure de couleur
US8908183B2 (en) 2010-12-20 2014-12-09 Axalta Coating Systems Ip Co., Llc Check-tile for colour measurement instruments
US8913238B2 (en) 2010-12-20 2014-12-16 Axalta Coating Systems Ip Co., Llc Check-tile for colour measurement instruments
CN106323849A (zh) * 2016-08-05 2017-01-11 天津大学 衡量照明光源对传统绘画色彩损伤的检测及评价方法

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