Additives : More art than science / Clifford K. Schoff in COATINGS TECH, Vol. 18, N° 2 (02/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 2 (02/2021) . - p. 40 Titre : Additives : More art than science Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2021 Article en page(s) : p. 40 Langues : Américain (ame) Catégories : Revêtements -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Additives modify paint or film properties or behavior, preferably (but not always) improving them. They are critical to successful formulation and to solving all kinds of paint problems, but choosing the right one can be exceedingly difficult and usually involves extensive trial and error. Many different types of additives are available and there are many different products within a given type. Detailed coverage would take many pages, rather than just one, but here are comments regarding a variety of additive types. Note de contenu : - Surfactants - Rheology modifiers - Defoamers/antifoams - Adhesion improvers - Slip aids - Solvents as additives - Coalescing solvents - Resins as additives - Recommendations En ligne : https://drive.google.com/file/d/1YwmJOylHNzfFE_9aoqHE7GxJHF56av28/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35258 [article]

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Automotive coatings defects part 1 / Clifford K. Schoff in COATINGS TECH, Vol. 1, N° 2 (02/2004)  

[article]  inCOATINGS TECH > Vol. 1, N° 2 (02/2004) . - p. 34-39 Titre : Automotive coatings defects part 1 : In-plant and field defects Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2004 Article en page(s) : p. 34-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : This paper deals with field defects and problems in automotive coatings and how they are caused or affected by weathering. It begins with a brief discussion of defects that occur in the auto factory, such as craters, pops, sags, and foreign material (dirt), some of which can affect durability. Then, it moves on to field defects and problems, a number of which occur as part of the weathering process. Others become worse with weathering. Examples of defects caused by weathering include blistering, water spotting, acid etch, cracking and spalling, delamination, fading and other color changes, and corrosion. Examples of defects that are worsened by weather include mar and scratch, cracking and, sometimes, stone chipping. Each of these defects is discussed. Note de contenu : - DEFECTS IN THE AUTO PLANT - FIELD DEFECTS, CHANGES AND PROBLEMS : Loss of gloss - Blistering - Water spotting, acid etch - Cracking, checking, and spalling - Delamination - Fading, yellowing, and other color changes - Corrosion - Mar and scratch - Stone chipping - Table 1 : Change in softening point with 15-day water soak En ligne : https://drive.google.com/file/d/1N0FxfD_BgT8PyVOVDyloiqkVkluTToVj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5557 [article]

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Automotive coatings defects / Clifford K. Schoff in COATINGS TECH, Vol. 1, N° 3 (03/2004)  

[article]  inCOATINGS TECH > Vol. 1, N° 3 (03/2004) . - p. 22-26 Titre : Automotive coatings defects : Part 2 : Weathering processes and their effets on coating properties Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2004 Article en page(s) : p. 22-26 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : This paper continues the discussion of weather-related field defects and problems in automotive coatings begun in Part 1.It describes changes in the properties of coatings such as fracture energy, hardness, glass transition, and barrier properties on weathering, and presents techniques that can be used to characterize a number of these changes. It describes the effects of weathering on various defects and discusses root cause analysis of field problems. It raises the possibility that important root causes of cracking, stone chipping, and mar and scratch problens may be in-plant repairs and overbaking. En ligne : https://drive.google.com/file/d/1aq6a3bv3xuU-olnqTM0KhapOroAXQi2s/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5552 [article]

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Coatings film defects / Clifford K. Schoff ; Percy E. Pierce / Blue Bell [Etats-Unis] : Federation of societies for coatings technology (1994) 

Titre : Coatings film defects Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur ; Percy E. Pierce, Auteur Editeur : Blue Bell [Etats-Unis] : Federation of societies for coatings technology Année de publication : 1994 Collection : Federation series on coatings technology Importance : 25 p. Présentation : ill. Format : 28 cm Note générale : Voir classeur rouge (côte USUEL 667.9 FED) - Bibliogr. Langues : Américain (ame) Langues originales : Américain (ame) Catégories : Revêtements -- Défauts Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Note de contenu : I. INTRODUCTION II. THEORETICAL BACKGROUND : A. Surface tension of pure liquids and solutions - B. Surface tension of solids III. FACTORS THAT INFLUENCE THE FLOW OF PAINT FILMS : A. Shear and gravity forces - B. Surface tension forces IV. COMMON COATINGS DEFECTS : CAUSES AND CURES : A. Zir entrapment - B. Benard cells - C. Bloom - D. Blushing - E. Bumps and sinks - F. Cratering - G. Crawling and dewetting - H. Fat edges and picture framing - I. Fish eyes - J. Floating - K. Flooding - L. Haze - M. Orange peel - N. Rub up - O. Sagging, running, curtaining - P. Seeds - Q. Silking - R. Solvent popping - S. Telegraphing - T. Water spotting V. TECHNIQUES FOR CHARACTERIZATION OF DEFECTS AND MEASUREMENT OF SURFACE PROPERTIES : A. Microscopy and macrophotography - B. Flocculation tests - C. Liquid surface tension - Contact angles - E. Dewetting tests - F. Observation of defect formation VI. GENERAL GUIDELINES FOR THE PREVENTION/SOLUTION OF DEFECTS : A. Formulation practices - B. Raw materials - C. Good housekeeping and production practices - D. Solvents - E. Additives - F. Substrates Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=278

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Convective flow and defects / Clifford K. Schoff in COATINGS TECH, Vol. 15, N° 3 (03/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 3 (03/2018) . - p. 76 Titre : Convective flow and defects Type de document : texte imprimé Auteurs : Clifford K. Schoff, Auteur Année de publication : 2018 Article en page(s) : p. 76 Langues : Américain (ame) Catégories : Revêtement -- Séchage:Peinture -- Séchage Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : After a coating is applied, there is a period when the film is still liquid. Evaporation of solvent or water cools the surface and entry into an oven heats the surface. In either case, a combination of density and surface tension differences can cause convective flow within the film as shown in Figure 1. Material moves from the coating-substrate interface, rises to the surface, then drops back down. The motion continues until the coating has dried or cured enough to raise the viscosity to a level that stops flow. In multi-pigment systems, one of the pigments rising with the flow may be trapped at the surface producing the defects called flooding and floating. If that pigment completely covers the surface or has become the major component of the pigment mix at the surface, the result is a darker or lighter shade of uniform color. We usually call this flooding. Rubbing the wet paint with a finger (known as rub-up) will show that the surface color is different from the interior of the layer. Partial coverage by one pigment resulting in ugly streaks or mottled regions is called floating, although both defects sometimes are labeled as floating since, in both cases, pigment is floating to the surface. Flooding and floating both produce unacceptable color effects. Note de contenu : - Fig. 1 : Diagram of convective flow showing the up and down pattern of motion - Fig. 2 : Example of a network of Bénard cells - Fig. 3 : Bénard cells in a white can coating En ligne : https://drive.google.com/file/d/1GOTN5P9DIU2ogYQEXOQxaf0J6b1yBfZA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30628 [article]

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Corrosion inhibitors / Clifford K. Schoff in COATINGS TECH, Vol. 13, N° 8 (08/2016)  

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Hansen solubility parameters (HSP) : 1-Introduction / Clifford K. Schoff in COATINGS TECH, Vol. 15, N° 5 (05/2018)  

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Hansen Solubility Parameters (HSP) : 2-Applications / Clifford K. Schoff in COATINGS TECH, Vol. 15, N° 7 (07/2018)  

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Optical microscopy / Clifford K. Schoff in COATINGS TECH, Vol. 3, N° 2 (02/2006)  

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Pigment dispersion II, testing / Clifford K. Schoff in COATINGS TECH, Vol. 17, N° 7 (07/2020)  

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Rheology / Clifford K. Schoff / Blue Bell [Etats-Unis] : Federation of societies for coatings technology (1997) 

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Rheology of melt and solutions Part 2 : Viscoelasticity, temperature, and surface flow viscoelasticity, temperature, and surface flow / Clifford K. Schoff in COATINGS TECH, Vol. 4, N° 9 (09/2007)  

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Self-healing materials technology : a vehicle for coating life extension / Clifford K. Schoff in COATINGS TECH, Vol. 9, N° 11 (12/2012)  

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Silicones and craters / Clifford K. Schoff in COATINGS TECH, Vol. 9, N° 10 (10/2012)  

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Solvent replacement / Clifford K. Schoff in COATINGS TECH, Vol. 16, N° 2 (02/2019)  

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Surface defects : Diagnosis and cure / Clifford K. Schoff in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 888 (01/1999)

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Sustainability and pigment dispersion / Clifford K. Schoff in COATINGS TECH, Vol. 16, N° 4 (04/2019)  

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Thoughts on waterborne industrial coatings / Clifford K. Schoff in COATINGS TECH, Vol. 14, N° 10 (10/2017)  

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Transition temperature microscopy / Louis T. Germinario in COATINGS TECH, Vol. 7, N° 2 (02/2010)  

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Waterborne : A different animal, Part 1 / Clifford K. Schoff in COATINGS TECH, Vol. 10, N° 1 (01/2013)  

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