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The importance of particle sizing in the coatings (paints, pigments) industry / Nick Grantham in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p. 19-39 Titre : The importance of particle sizing in the coatings (paints, pigments) industry Type de document : texte imprimé Auteurs : Nick Grantham, Auteur Année de publication : 1996 Article en page(s) : p. 19-39 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The importance of controlling the particle size of materials used in the paint industry is a relatively new phenomena. In the past mediaeval European painters decorated churches and palaces with a mixture of pigment (e.g red lead, lapis lazuli) mixed with an animal glue (e.g egg white) and ground into water. Later (13th centry) linseed oil was added to the mixture. By 1900, products were still largely based around white lead or zinc oxide, linseed oil and turpentine, but new organic and inorganic pigments were starting to be developed. Zincoxide (refractive index 2.0) was still used up till about 1945, when titanium dioxide (refractive index 2.7) came into the use. This material still has not been superseded as a white pigment (see th section on Pigments). However, despite these recent developments, the paint industry has only emerged from the "witchcraft" era in the last thirty years or so, when science started to play a part in paint formulation. Some would say that it is still in the witchxraft era! Particle size controls a number of properties important to the paint chemist: - Optical properties including opacity - Tinting strength - Viscosity - Sedimentation Improved quality methods mean that paint companies now need to control the performance of their paints at the manufacturing stage. This need has stemmed from increased pressure from the large paint consumer especially industries like the automobile industry. These users have required tighter tolerances and specifications on their suppliers and the paint manufacturers have had to respond. Traditionnaly the paint industry has not been a manufacturer of any chemicals - it buys the chemicals it needs, formulates them packages the material. This article attempts to explain the importance of particle size to the modern paint compagny and to illustrate it with relevant examples. Note de contenu : WHAT IS PAINT ? : Binder - Pigment - Solvent - Additives - PIGMENTS - WHAT IS A PARTICLE ? : The particle size conundrum - The equivalent sphere (Equivalent spherical diameter of cylinder 100x20µm, Equivalent spherical diameter of cylinders of various ratios) - Different techniques - D(4,3) etc - Different techniques give different means (To show that the volume and weight equivalents of a particle are identical, Volume equivalent, Weight equivalent) - Number et volume distibutions) - Interconversion between number length and volume/mass means - Measured and derived diameters - Which number do we use ? - Mean , Median an Mode - basic staistics - WHY IS PARTICLE SIZE SO IMPORTANT IN PAINTS : Opacity - Colour hue - Tinting strength - Gloss - Durability - Viscosity - Sievers - Sedimentation - Electrozone sensing (Coulter Counter) - Microscopy - Laser diffraction - APPLICATION TO THE COATINGS INDUSTRY : Carbone black - Powder coatings - Metal powders - THE RANGE OF AVAILABLE PRODUCTS : The Mastersizer range (MSX) - The Autosizer range Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13408 [article]

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Emerging powder coating techniques / Y. G. Ghaisas in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p.47-56 Titre : Emerging powder coating techniques Type de document : texte imprimé Auteurs : Y. G. Ghaisas, Auteur Année de publication : 1996 Article en page(s) : p.47-56 Langues : Anglais (eng) Tags : 'Peinture  poudre'  Peinturage  'Projection  électrostatique'  Equipement Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Wonder Disc - A mini automatic powder coating plant - Conveyorised powder coating plant : Powder coating gun - Reciprocator - Powder spray booth - Different technologies - Infrared oven for powder curing : What is Infra red ? - Application of infrared for powder curing - Advantages of infrared curing - Limitations - Oven - Overhead chain conveyor - Powder recycling system - Shalaka : Electrostatic powder coating equipment - Factors governing the powder coating performance : Pretreatment - Jigging - Powders - Compressed Air Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13414 [article]

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Mica Colors - The new dimension in automotive finishes / Roman Maisch in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p.57-63 Titre : Mica Colors - The new dimension in automotive finishes Type de document : texte imprimé Auteurs : Roman Maisch, Auteur Année de publication : 1996 Article en page(s) : p.57-63 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  'Pigment  minéral'  nacré'  Mica  Formulation  Utilisation  'Industrie  automobile' Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Nature and function of pearl lustre pigments used in automotive colors - structure and function - Colors of mica pigments - Particle size range - Weatherabilitiy - Formulations and effects. Pigment addition to the paint system. Observations on color measurement of mica pigmented paints - Incorporation of mica pigments into an automotive paint system - Formulation of automotive mica finishes - Application of automotive mica paints - Repair of automotive mica finishes - Color measurement of automotive mica colors - Summary and outlook Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13415 [article]

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Evaluation of an automobile touch up paint system / Nori Krishnamurti in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p. 63-66 Titre : Evaluation of an automobile touch up paint system Type de document : texte imprimé Auteurs : Nori Krishnamurti, Auteur ; H. N. Niedhammer, Auteur ; Michael Rösler, Auteur Année de publication : 1996 Article en page(s) : p. 63-66 Langues : Anglais (eng) Tags : Peinture  '  Utilisation  Automobile  Réparation  'Propriété  physique'  mécanique'  optique'  Feuil  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : A paint system consisting of a 2 component epoxy primer and a glossy polyurethane top coat has been evaluated for its hardness, impact, gloss retention and its resistance towards accelerated weathering, in order to assess its suitability for modern automobile touch up paint applications. Note de contenu : - Materials - Preparation of painted panels - Properties of the paint films Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13416 [article]

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Emerging powder coating techniques / Y. G. Ghaisas in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p. 47-56 Titre : Emerging powder coating techniques Type de document : texte imprimé Auteurs : Y. G. Ghaisas, Auteur Année de publication : 1996 Article en page(s) : p. 47-56 Langues : Anglais (eng) Tags : Peinture  poudre  Peinturage  Projection  électrostatique  Equipement Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Wonder Disc- A mini autiomatic powder coating plant - Conveyorised powder coating plant - Infrared oven for powder curing - Shalaka- electrostatic powder coating equipment - Factors governing the powder coating performance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13450 [article]

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Mica colors : The new dimension in automotive finishes / R. Maisch in PAINTINDIA, PAINTINDIA 96 (02/1996)

[article]  inPAINTINDIA > PAINTINDIA 96 (02/1996) . - p. 57-62 Titre : Mica colors : The new dimension in automotive finishes Type de document : texte imprimé Auteurs : R. Maisch, Auteur Année de publication : 1996 Article en page(s) : p. 57-62 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  'Pigment  minéral'  nacré'  Mica  Formulation  Utilisation  'Industrie  automobile' Index. décimale : 667.9 Revêtements et enduits Résumé : Pearl lustre pigments have been used in automotive coatings in mass production in the USA since the beginning of the eighties. In 1989, about 35% of all automotive finishes in the USA were formulated with pearl lustre pigments and there is still a slight upward trend. In europe we are currently at the beginning of a similar development. Pearl lustre finishes have also been familiar here for some time and the first large series in these new xolors are now leaving the coating lines of the automobile manufacturers. Note de contenu : Part I - Nature and function of pearl lustre pigments used in automotive colors - Structure and function - Colors of mica pigments - Particle size ranges - Wheatherability Part II - Formulations and effets. Pigment addition to the paint system. Observations on color measurement of mica pigmented paints - Incorporation of mica pigments into an automotive paint system - Formulation of automotive mica finishes - Application of automotive mica paints - Repair of automotive mica finishes - Color measurement of automotive mica colors Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13451 [article]

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