ECO at all costs ? An ecological balance of some water-based paints / A. Hofland in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 848 (09/1995)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 848 (09/1995) . - p. 113-119 Titre : ECO at all costs ? An ecological balance of some water-based paints Type de document : texte imprimé Auteurs : A. Hofland, Auteur Année de publication : 1995 Article en page(s) : p. 113-119 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Atmosphère -- Pollution -- Lutte contre Composés organiques volatils Formulation (Génie chimique) Haut extrait sec Perméabilité Polyalkydes Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : Although thermoplastic dispersions have reached a high level of sophistication, there is a place in the market for the more environmentally friendly alkyd emulsions where high gloss can be obtained without cosolvents, amines, and the like. Water, alkyd, nonionic surfactant, and the appropriate equipment is all one needs to make a clear varnish with >85% gloss under 20°, dry in three to five hours. With the present state of technology, it is unlikely that alkyd emulsions can match the performance of the present solvent-based siliconized alkyds and other extreme outdoor durable systems. Beacause of their more conventional permeability behavior and the higher applied layer thickness, high solids seem more suitable for this purpose. Going to the lower end of the market, high-solids systems can be applied in specific segments, taking into account limitations like its price, hardness development, and yellowing characteristics. For the lowest segments (primers and stains), their application will be limited. It is in these segments that acrylic dispersions have acquired a good reputation, for both their performance and price have been accepted by the do-it-yourself market. In the middle section, ranging from normal outdoor durable alkyds to the better performance stains, alkyd emulsions can be positioned. Their versatility and excellent environmental score (no volatile organic components are necessary) make them exceptionally suitable for this. Note de contenu : - THE ENVIRONMENTAL ISSUE : Workers versus environment - Water versus air protection - Controlled versus uncontrolled application - THE QUALITY ISSUE : The effect of film formation upon permeability - Rheological performance of an alkyd emulsion paint - Some side effects of drying - A comparison with existing paint systems - Formulating an alkyd emulsion paint Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18558 [article]

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Life cycle analysis of alkyd emulsion based paint / J. Beetsma in SURFACE COATINGS INTERNATIONAL, Vol. 81, N° 10 (10/1998)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 81, N° 10 (10/1998) . - p. 491-494 Titre : Life cycle analysis of alkyd emulsion based paint Type de document : texte imprimé Auteurs : J. Beetsma, Auteur ; A. Hofland, Auteur Année de publication : 1998 Article en page(s) : p. 491-494 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  eau'  émulsion'  'Alkyde  résine'  'Cycle  vie  (environnement)' Index. décimale : 667.9 Revêtements et enduits Résumé : Quality and costs were traditionally the main factors in the paint industry. Today also environmental considerations have become more and more important. In view of existing and announced environmental legislation the reduction of volatile organic compounds is one of the main driving forces of product development. There is no doubt that reduction of VOC content is important. However, it is doubtful if this is the best means of evaluating the environmental effect of new systems. In the authors' opinion an integrated chain evaluation or life cycle analysis is a better way. In 1989 the Dutch Government announced in their National Environmental Policy Plan the intention to develop a method for the evaluation of the environmental effects of new products. These 'Eco-yardsticks' were developed by TAUW Infra Consult and published in 1991. The method embodies eight main sections : 1. Raw materials 2. Energy 3. Emissions 4. Nuisance 5. Waste 6. Re-usability 7. Respairability, and 8. Lifespan These main sections are subdivided in twenty-five sub headings, such as exhaustion of non-renewable raw materials, emissions of acidifying compounds and chemical waste. Decorative paints were one of the product groups by which the method was investigated during 1992. Four different paints were studied and evaluated for the relevant sub headings. Surprisingly the acrylic dispersion-based paint performed worst in the life cycle analysis. This was unexpected as these paint systems contain mainly water-based as solvent. The results of the study have been presented to the paint industry by Bancken and Geurink. Their main conclusion was that this integrated chain approach, based on the 'Environmental Measures', offers a sound basis for the evaluation of the environmental effects of different products. This paper describes subsequent investigations into this subject, including alkyd emulsions and clear varnishes. Note de contenu : - LIFE CYCLE ANALYSIS - ADDITIONAL HEADINGS : Photochemically active compounds - Required air quantity during application - UNPIGMENTED SYSTEMS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16717 [article]

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