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New applications for CAB / K. R. Walker in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 11-14 Titre : New applications for CAB Type de document : texte imprimé Auteurs : K. R. Walker, Auteur Année de publication : 2002 Article en page(s) : p. 11-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétobutyrate de cellulose Automobiles -- Vernis Carboxyméthylcellulose Epaississants Formulation (Génie chimique) Mouillage (chimie des surfaces) Primaire (revêtement) Rhéologie Vernis en phase aqueuse vernis en phase solvant Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The introduction of a water-based equivalent to CAB rheology modifers offers considerable cost savings and performance advantages for manufacturers of water-based coatings. The author shows how CMCAB works. For over 40 years cellulose acetate butyrates (CABs)have been used to modify the rheology and to improved hardness to solvent-based coatings. However, as pressure on released VOCs has increased, the use of water-based systems have, in recent years, become more important. It has been estimated that around 50% of the OEM automotive basecoats applied in Western Europe use an aqueous coating basecoat formulation. Automotive refinish paints, industrial metal, wood, a,d plastic coatings are also being pressured into the water-based route and much development is being directed into this area. Water-based coatings, however, suffer from several disadvantages compared to their solvent-based precursors. Substrate wetting arising from water's high surface tension, its slow drying rate, and the susceptibility of its evaporation rate to changes in relative humidity, all contribute to difficulties in maintaining constant properties in the appearance and application of water-based coatings can be duplicated in a variety of water-based systems with carboxymethylcellulose acetate butyrate (CMCAB). Note de contenu : - Taking a hiding - Beaten black and blue - Substrate wetting - Solvent-based clearcoats - Basecoat formulation - Driving progress - FIGURES : 1. CMCAB offers greater colour strength (top band) than traditional dispersions. This cuts costs - 2. Dry to touch time of hydroxy-functional acrylics - 3. Gloss and DOI are unaffected by CMCAB - 5,6. Viscosity variations and effect on film formation - 7. Correct flake orientation in the paint film is essential to create the curved effect that highlights vehicle design - TABLES : 1. Formulation of water-based clear coats Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28080 [article]

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Still waters run deep / Keith Dobell in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 16-20 Titre : Still waters run deep Type de document : texte imprimé Auteurs : Keith Dobell, Auteur Année de publication : 2002 Article en page(s) : p. 16-20 Langues : Anglais (eng) Catégories : Débimétrie Epaississants Formulation (Génie chimique) Granulométrie Polyacryliques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Surfactants Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Flow control can present many hazards in coatings warns the author. Paying attention to all the detail and watching for undercurrents can make all the difference. Slow mowing water appears tranquil enough but can be treacherous. Subdued Flow; calm surface - but beneath lies a less friendly, less predictable environment. Flow control can present as many hazards in coatings but tends not to have "Danger Deep Water" warnings. Attention to detail in additive selection, dose rates and incorporation conditions, process & sequence are essential elements to respect in formulating coatings. Ignore them at your peril. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28081 [article]

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Rules drive innovation / Jim Reader in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 22 Titre : Rules drive innovation Type de document : texte imprimé Auteurs : Jim Reader, Auteur ; Kevin R. Lassila, Auteur ; Steven R. Carney, Auteur Année de publication : 2002 Article en page(s) : p. 22 Langues : Anglais (eng) Catégories : Biosurfactants Isotherme d'adsorption Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : A new generation of biodegradable surfactantsare meeting the latest in strict environmental regulations, report the authors. There is a continuing trend in modern coatings towards systems with improved environmental and health properties, often driven by existing or proposed future legislation, but also by end-user demands for improved performance or safety. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28082 [article]

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Better resin management / Shao-Hua Guo in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4452 (05/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4452 (05/2002) . - p. 24-27 Titre : Better resin management Type de document : texte imprimé Auteurs : Shao-Hua Guo, Auteur ; Wei Wang, Auteur ; Stephen H. Harris, Auteur ; Shanty Patel, Auteur ; L. Joseph Junker, Auteur ; Ronald S. Blackwell, Auteur ; Farhad Faddakar, Auteur ; Daniel B. Pourreau, Auteur Année de publication : 2002 Article en page(s) : p. 24-27 Langues : Anglais (eng) Catégories : Acrylates hydroxy-fonctionnels Automobiles -- Revêtements:Automobiles -- Peinture Copolymère uréthane acrylique Durée de vie en pot Formulation (Génie chimique) Groupe allyle Polyhydroxyéthyle acétate Polyméthacrylate d'hydroxyéthyle Polyols Revêtements bi-composant:Peinture bi-composant Index. décimale : 667.9 Revêtements et enduits Résumé : The evolution in the approach for developing low-VOC coatings is examined. Acrylic two-component (2K) urethane technology has undergone a gradual evolution over the past twenty years. Incremental changes in acrylic polyols and isocyanate crosslinkers have been, for the most part, driven by lower VOC content limits and increased performance requirements. However, the basic chemistry of acrylic polyols has not substantially changed over that time period. Almost every acrylic polyol on the market today is obtained by free-radical polymerisation of acrylate and methacrylate esters and styrene. Hydroxyl functionality is introduced by adding hydro-functional acrylates (HFAs) to the monomer blend. Note de contenu : - Lower VOCs hits performance - The resin management concept - End-use versatility - Improving control - Resin management at work - Pot life - Overall benefits - FIGURES : 1. Hydroxy-functional acrylates (HFA) used in conventional polyols - 2. HFA polyols have greater variation of functionality with weight - 3. Allylic monomers used in the latest acrylic polyols - 4. Comparison of HEMA-based and AP1.0-based polyols - TABLE : White pigmented 2K urethane formulations from hard and soft blends and commercial acrylic polyols Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28083 [article]

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