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Oil-modified urethanes for clear wood finishes : Distinction or extinction ? / Richard A. Caldwell in COATINGS TECH, Vol. 2, N° 14 (03/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 14 (03/2005) . - p. 30-41 Titre : Oil-modified urethanes for clear wood finishes : Distinction or extinction ? Type de document : texte imprimé Auteurs : Richard A. Caldwell, Auteur Année de publication : 2005 Article en page(s) : p. 30-41 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Conventional solvent-based oil-modified urethanes (OMU) have been a mainstay in wood flooring and clear varnish applications for many years. Since their introduction into the United States in the early 1950s, their usage has grown steadily. They find application in the toughest environments, like gymnasium and athletic floors, as well as clear varnishes for hardwood floors in homes, offices, and other public buildings. While favored by the professional flooring contractor, they also are used by the do-it-yourself (DIY) homeowner, for everything from floors to cabinet refinishing to wood furniture restoration. The features that have made this technology so popular over the years include ease of application, fast dry, excellent long-term durability, and reasonable cost. There are very few resin and varnish systems that can provide the ease of use, appearance, dry time, early mar and scuff resistance, abrasion resistance, and household stain and chemical resistance of a solventborne oil-modified urethane varnish. Currently, conventional solvent-based oil-modified urethanes, with all of their features and benefits, are facing extinction in the marketplace. The cause: implementation of volatile organic compound (VOC) regulations. The top performing solvent-based oil-modified urethanes have a hefty 520–550 gram/liter VOC. Regulations that will take effect in the northeastern United States in 2005 and in the Los Angeles area of California in 2006 call for VOCs of 350 g/L and 275 g/L, respectively. Questions that are addressed in this article include: (1) What is an oil-modified urethane, and why is it so popular for wood floor coatings? (2) What are the VOC regulations? When do they take effect? (3) What test methods were used to determine alternative technology performance? (4) What are the alternatives to solvent-based OMU technology? (5) How do the alternatives compare to the best of the solvent OMU technologies (550 g/L)? (6) Is oil-modified urethane technology doomed to extinction, or do the VOC-compliant alternatives provide an opportunity for distinction? En ligne : https://drive.google.com/file/d/1GvVdN1RD1gdx_2G0klewjqrXwslVnOxw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5519 [article]

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UV-A curable polyurethane dispersions in wood coatings : Reducing the hurdle of inventment costs in UV equipment / Robert A. Wade in COATINGS TECH, Vol. 2, N° 14 (03/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 14 (03/2005) . - p. 42-46 Titre : UV-A curable polyurethane dispersions in wood coatings : Reducing the hurdle of inventment costs in UV equipment Type de document : texte imprimé Auteurs : Robert A. Wade, Auteur ; Michael Dvorchak, Auteur ; Christoph Irle, Auteur Année de publication : 2005 Article en page(s) : p. 42-46 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Radiation curable coatings have been used in the wood coatings industry for several years. Major benefits of radiation cure are the high curing speed and high crosslink density. High performance coatings with extremely low VOC/VHAPS, excellent abrasion, as well as chemical resistance, are obtained. When complex substrates must be coated there is always the concern of uncured surfaces in shadow areas. Typically, more expensive UV equipment that optimizes a homogeneous radiation exposure is necessary, which requires higher capital investment. This has been seen for years as the largest hurdle for the industrial coater. A new waterborne coatings system based on UV-PUDs can be cured with low energy UV-A lights, without sacrifice of performance properties for wood coatings applications. These types of lamps are significantly cheaper in their investment costs as well as in their maintenance. In this article, coatings performances are discussed with special respect to low intensity UV-A lamps, UV-curing PUDs, and the effect of adding self-crosslinking dispersions. The effects of adding water-dispersible polyisocyanates and carbodiimide crosslinkers to such coatings are also be presented. En ligne : https://drive.google.com/file/d/1YaHRg6gLOSQGLC1B-BcopGuwW7UH6wlR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5520 [article]

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Gas chromatography in coatings analysis / Francis V. Acholla in COATINGS TECH, Vol. 2, N° 14 (03/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 14 (03/2005) . - p. 58-63 Titre : Gas chromatography in coatings analysis Type de document : texte imprimé Auteurs : Francis V. Acholla, Auteur Année de publication : 2005 Article en page(s) : p. 58-63 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Gas chromatography (GC) continues to play a vital role in the analysis of coatings and related materials. This article focuses primarily on those areas where new insights have emerged in the literature and in our laboratories in the last several years. En ligne : https://drive.google.com/file/d/1D3X2ai7RIy8mA0JIRu6ieHP7BA-6mdQZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5521 [article]

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Critical pigment volume concentration measurements... A very fast method / Walter K. Asbeck in COATINGS TECH, Vol. 2, N° 14 (03/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 14 (03/2005) . - p. 64-66 Titre : Critical pigment volume concentration measurements... A very fast method Type de document : texte imprimé Auteurs : Walter K. Asbeck, Auteur Année de publication : 2005 Article en page(s) : p. 64-66 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Concentration pigmentaire volumique critique Mesure Index. décimale : 667.9 Revêtements et enduits Résumé : Because of the importance of knowing the Critical Pigment Volume Concentration (CPVC) for maximum performance of ail pig¬mented coating systems, a large number of methods to measure CPVC have been proposed. All at¬tempts to predict the critical point on theoretical grounds have been unsuccessful. Some tests for CPVC are quite accurate and reliable in showing where the break in the for¬mulating ladder exists. Some re¬quire considerable judgment. All tests for CPVC, unfortunately, require the preparation of the coat¬ing compositions, induding pig¬ments used, vehicles (both solution and latex type), and their grinds. The composition must then be de¬posited on some substrate and dried—either by air or bake—before the classical tests can be used. All facets of the coatings manufacture must be induded in the test sam¬pies. The required sample may be produced relatively fast in the case of baked systems or very slow in the case of some air-dried systems. Ail of the classical tests made on these PVC ladders are relatively time consuming and total testing time may require many hours. A new method of testing on the PVC ladder, which is both veryfast and requires minimal instrumentaion, is proposed here. For the most part, the tests on each sample can be made in less than one minute. Note de contenu : - Critical Pigment Volume Concentration measurements - A very fast method - A new test method - Table 1 : Possible test methods En ligne : https://drive.google.com/file/d/1ethbd5ntriuH4C-_Xst2Dzty3DMeEpGt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40683 [article]

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