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A new sample preparation technique for the examination and analysis of paint film defects / Thomas J. Veneri in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 23-29 Titre : A new sample preparation technique for the examination and analysis of paint film defects Type de document : texte imprimé Auteurs : Thomas J. Veneri, Auteur ; Jack A. Kramer, Auteur Année de publication : 1994 Article en page(s) : p. 23-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces -- Défauts Echantillonnage Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : A paint film cross-sectioning technique has been developed which allows simultaneous characterization of a paint defect and the underlying substrate and pretreatment. The advantages of the technique include speed, accuracy of cross-sectioning the defect, simplicity, lack of polishing artifacts, and a pseudo-three-dimensional perspective which uniquely reveals the relationship between the defect, paint film and substrate. Disadvantages include possible damage to the sample or removal of contaminants by the solvents used. The prepared sample may be examined using an optical or scanning electron microscope (SEM), and analyzed by x-ray fluorescence (XRF) or other methods. The technique has proven especially useful for pinpointing the cause of defects resulting from interaction of the substrate or pretreatment with the paint film. This paper describes the practice of the technique and its application to solving production problems related to paint defects Note de contenu : - Galvanized gassing - Paint inclusions - Rinse deposits - Nubbing - Weld balls - Galvanizing defects - Pinholing - Cratering Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18585 [article]

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High-solids nonaqueous dispersion coatings based on crystalline oligoesters / Ganghui Teng in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 31-37 Titre : High-solids nonaqueous dispersion coatings based on crystalline oligoesters Type de document : texte imprimé Auteurs : Ganghui Teng, Auteur ; Frank N. Jones, Auteur Année de publication : 1994 Article en page(s) : p. 31-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dispersions et suspensions Formulation (Génie chimique) Haut extrait sec Liants Oligomères Polyesters Polymères cristallins Revêtements Rhéologie Vernis Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Nonaqueous dispersions (NADs) of a crystalline oligoester diol were prepared by crystallization in a medium consisting of amorphous diol, reactive diluent (RD), and a solvent. The crystalline diol (6GT) was prepared from terephthalic acid and 1,6-hexanediol; RD was prepared from terephthalic acid and glycidyl neodecanoate. The dispersions are opaque, thixotropic liquids with low viscosities at solids of 60-70 wt%. X-ray and calorimetry studies show that the dispersed particles are crystalline. Microscopy shows that they have a narrow distribution of diameters, varying from 5 to 20 μm depending on process conditions. When formulated with crosslinkers (melamine or isocyanate resins) and baked at temperatures above the melting point of the crystalline diol, these NADs gave transparent coatings. Glossly pigmented coatings were also prepared. As high-solids coatings, these materials provide excellent application properties (resistance to sagging) and a good balance of film physical properties. While some of the formulated coatings stratify on standing, they can be restored to homogeneous, free-flowing liquids by stirring gently. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthesis of 6GT,6GCH and DED - Synthesis of reactive diluent (RD) - Preparation of nonaqueous dispersions and unpigmented coatings - Preparation of pigmented NAD coatings - Preparation of clear coatings based on 6GCH and DED - Film formation and testing - Instrumental methods - RESULTS AND DISCUSSION : Syntheses of 6GT, 6GCH, and RD - Preparation and stability of nonaqueous dispersions - Particle size and morphology - Factors governing formation and stability of NADs - Film formation and film properties of NAD coatings - Application characteristics of NAD coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18586 [article]

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Aluminium trihydroxide (ATH) : a UV transparent filler for UV-curable coatings / Anthony A. Parker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 39-46 Titre : Aluminium trihydroxide (ATH) : a UV transparent filler for UV-curable coatings Type de document : texte imprimé Auteurs : Anthony A. Parker, Auteur ; E. S. Martin, Auteur ; T. R. Clever, Auteur Année de publication : 1994 Article en page(s) : p. 39-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Charges (matériaux) Hydroxyde d'aluminium Réticulation (polymérisation) Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Unlike other extenders, aluminum trihydroxide (ATH) absorbs very little ultraviolet radiation over the wave-length range which is commonly used to activate most UV photoinitiators (220 to 400 nm). This is demonstrated by comparing the total transmittance (diffuse and specular) of UV-cured polyurethane films with and without the use of ATH as an extender. Difference spectra between filled and unfilled systems show that ATH does not interfere with the transmittance of UV light. On the other hand, a comparable study with a silica-filled system indicates that a higher proportion of UV light is absorbed. Solid state 13C NMR and FTIR spectra of ATH-filled, silica-filled, and neat systems show that the final chemical components of the crosslinked polymer matrices are similar (...) Note de contenu : - EXPERIMENTAL : Composition and physical properties of fillers - Coating application and curing - Film densities and effective polymer concentrations - UV/VIS spectroscopy of cured films - UV/VIS spectroscopy of powders - Solid state 13C nuclear magnetic resonance (NMR) of cured films - Fourier transform infrared spectroscopy (FTIR) of cured films - Differential photocalorimetry studies (DPC) - RESULTS AND DISCUSSION : Effect of fillers on the degree of cure - UV/VIS measurements of cured films : total transmittance and absorbance - UV/VIS measurements of cured films : specular and diffuse transmittance - UV/VIS measurements of neat powders - Effect of particle size on the UV transparency of ATH Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18603 [article]

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Influence of defoamers on the efficiency of waterborne coating systems / Wernfried Heilen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 47-53 Titre : Influence of defoamers on the efficiency of waterborne coating systems Type de document : texte imprimé Auteurs : Wernfried Heilen, Auteur ; Otto Klocker, Auteur ; Jay Adams, Auteur Année de publication : 1994 Article en page(s) : p. 47-53 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimousse Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Foam problems during production and application of waterborne systems are common. The reasons for the generation and stabilization of foam, and the types of foam in these systems, have been the subject of numerous discussions. Foam is generated and stabilized by the presence of surfactants commonly found in small concentrations (e.g., wetting agents and polymer emulsifiers). Destabilization of foam is achieved through the addition of substances which orient themselves at the air/liquid interface, resulting in a reduction of surface tension. This paper discusses the different types of foam, the phenomenon of foam generation, and the physical and chemical aspects of the technology and substances available to destabilize foam successfully. Note de contenu : - INTRODUCTION : Causes of foam - Foam stabilization mechanisms - Buoyancy - DEFOAMING MECHANISMS : Defoamer formulations - TEST METHOD FOR DEFOAMER EVALUATION Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18604 [article]

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Indentation/penetration hardness testing - the future / Maynard R. Euverard in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 829 (02/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 829 (02/1994) . - p. 55-59 Titre : Indentation/penetration hardness testing - the future Type de document : texte imprimé Auteurs : Maynard R. Euverard, Auteur Année de publication : 1994 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Dureté (matériaux) Indentation des matériaux Mesure -- Instruments Revêtements Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : This paper relates to the future of hardness measurement. It is doubtful if any one method will satisfy all future requirements for "hardness" measurement of decorative and protective coatings. If for no other reason, this will be due to failure to agree on a single definition of hardness. This paper has presented three different advancements for the measurement : 1 - A triple ball sled for a reversible inclined plane apparatus ; 2 - A refined variable load Pfund indenter ; and 3 - A hardness measuring boat for use in force determining and recording linear motion machines. Only continued research by individual investigators will advance the technique of hardness measurement with these promising developments. Note de contenu : - Types of penetrating hardness instruments Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18605 [article]

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