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Reducing wood curing costs / Robert A. Wade in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4489 (06/2005)
[article]
Titre : Reducing wood curing costs Type de document : texte imprimé Auteurs : Robert A. Wade, Auteur ; Michael J. Dvorchak, Auteur ; Chirstopher Irle, Auteur Année de publication : 2005 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Bois -- Finition
Carbodiimides
Coût -- Contrôle
Dispersions et suspensions
Photoréticulation
Polyisocyanates
Polyuréthanes
Vernis -- Séchage sous rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : This article explains how UV-curable polyurethane dispersions in wood coatings reduce the investment in costs in UV equipment.
Radiation curable coatings have been used in the wood coatings industry for several years. To improve productivity in many applications, flat substrates are coated, e.g. in hardwood flooring or the furniture industry. Major benefits of a photopolymerisation are the high curing speed and high crosslink density. High performance coatings with 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 optimises a homogeneous radiation exposure is necessary. In addition, only high throughput lines make an investment in UV curing equipment affordable. The high investment costs were seen for years as the biggest hurdle for an industrial coater before entering into UV curing technology.
A new coatings system based on UV-PUD's 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. Coatings performances will discussed with special respect to low intensity UV-A lamps, UV-curing PUD's, and the effect of adding self-crosslinking dispersions. The effects of adding water-dispersible polyisocyanates and carbodiimide crosslinkers to such coatings are also presented.Note de contenu : - UV curing and UV equipment
- Radiation curing dispersions
- Low-intensity UV-cured water-borne coatings
- FIGURES : 1. UV-A lamp spectral output with blue filters (wavelength in nm) - 2. Building blocks of UV-curing polyurethane dispersions - 3. Hardness properties at various cure conditions - 4. Chemical resistance properties at various cure conditions - 5. Hardness and chemical resistance with addition of carbodiimide crosslinker (system B) - 6. Staining resistance of dual cure waterborne UV pigmented coatings Din 68861 1b, 5 = pass, 0 = fail - 7. Hardness development of dual cure waterborne UV pigmented coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27637
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4489 (06/2005) . - p. 46-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002059 - Périodique Bibliothèque principale Documentaires Disponible Using "high performance two-component waterborne polyurethane" wood coatings / Michael J. Dvorchak in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 866 (03/1997)
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Titre : Using "high performance two-component waterborne polyurethane" wood coatings Type de document : texte imprimé Auteurs : Michael J. Dvorchak, Auteur Année de publication : 1997 Article en page(s) : p. 47-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois
Bois -- Revêtements
Formulation (Génie chimique)
Liants
Mélanges (chimie)
Polyuréthanes
Projection de matériaux
Revêtements bi-composant
Revêtements en phase aqueuse:Peinture en phase aqueuse
Taille des particulesIndex. décimale : 667.9 Revêtements et enduits Résumé : Recent developments in coatings technology have resulted in two-component waterborne polyurethane wood coating formulations which offer the benefits of traditional solvent-borne systems ; however, these 2K WB/PUR systems offer significant reductions over solvent-borne systems in VOCs and HAPs, meeting stringent environmental regulations. In addition, 2K WB/ PUR systems meet specifications for finishes for kitchen cabinets, office, laboratory, and household furniture. This paper looks at the differences between solvent-borne polyurethane systems (2K SOV/PUR) and 2K WB/PUR systems. Also discussed are physical properties, formulation parameters, application techniques, and industrial hygiene issues. Note de contenu : - Chemistry
- Chemistry in the solution
- Chemistry in the film
- Variability in system performance via formulating techniques
- mixing and particle size
- Batch mixing
- Two-component mixing
- Electrostatic application of two-component waterborne polyurethanes
- Industrial hygiene
- Loss of hexamethylene diisocyanate monomer in the paint solutionPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18107
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 866 (03/1997) . - p. 47-52[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003535 - Périodique Bibliothèque principale Documentaires Disponible UV cure automotive refinish : clearcoats and primers at the speed of photons / Michael J. Dvorchak in COATINGS TECH, Vol. 19, N° 9 (11-12/2022)
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Titre : UV cure automotive refinish : clearcoats and primers at the speed of photons Type de document : texte imprimé Auteurs : Michael J. Dvorchak, Auteur Année de publication : 2022 Article en page(s) : p. 24-35 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Automobiles -- Vernis
Formulation (Génie chimique)
Primaire (revêtement)
Revêtement monocomposant
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements bi-composant
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Over the past decade, the automotive-refinish industry has been forced to look at innovative technologies to reduce volatile organic compound (VOC) content and hazardous air pollutants (HAPs) while providing a rapid return to service of the consumer's vehicle.
UV-A-cured one-component (1K) autorefinish primers were first introduced in the mid-1990s. UV-A clearcoats were subsequently introduced in the late 1990s.
Materials have continued to be developed and pushed to mimic the classic two-component (2K) solvent-based polyurethanes (PURs) ; however, slow acceptance by the auto-refinish market over the past two decades is indicative of a market that is difficult to change.
The automotive-refinish coatings market is forecast to surpass U.S. $6.3 billion globally in 2021. This market is expected to increase by 5.4% CAGR between 2021 and 2031. The main technology types are solventborne, waterborne, and UV cure.
The classic coating layers are primers, basecoats, topcoats, and clearcoats. A specific parameter in the refinish area that must be addressed is the bottleneck of a 2-hour cure for the primer before it can be sanded. Current UV-cure primers can be sanded within 2 minutes. The need to lower VOCs and volatile HAPs (VHAPs) is among the current constraints for all technologies. A hurdle that was recently cleared in the UV-cure sector is the price barrier for UV light equipment. Reports for the market have UV LED units priced under $1,000.2 This market continues to consolidate and will be required to decrease refinishing speeds to remain competitive.
This article will review the history of the UV-cured 1K and 2K auto-refinish market and formulations for primers and clearcoats. It will also attempt to look at current UV-cured 1K and 2K auto-refinish primers and clearcoats in the global market, new formulations, and new developments in UV equipment.Note de contenu : - CHANGES IN THE AUTOMOTIVE OEM AND REFINISH MARKETS
- INTRODUCTION OF UV-A-CURABLE AUTO REFINISH : Early attempts to develop a UV refinish clearcoat - Early patents on UV-A cure auto-refinish primers - Automotive OEM technical paper on UV auto-refinish clearcoats
- PRODUCTION AND INNOVATION IN THE MARKET : Combinatorial chemistry approach to identify the best non-air-inhibited formulation - Mimicking a 2K polyurethane clearcoat with a 1K-A-cure clearcoat via Tg values - 2K UV-A-curable clearcoat that uses a photo latent amine catalyst - 1K and 2K UV-A-curable clearcoat - 1K UV-A clearcoat and primer field study to evaluate long-term performance - Current RADTECH automotive refinish project - Continued development of a 1K UV-A cure clearcoat
- TODAY'S UV-A CURE LIGHT SOURCES FOR THE 1K UV-A-CURE AUTOMOTIVE-REFINISH MARKET
- FORECAST FOR THE UV-A-CURABLE REFINISH MARKET
- NUMEROUS TECHNIQUES HAVE BEEN USED TO MITIGATE OXYGEN INHIBITION
- Table 1 : Methods to mitigate oxygen inhibition showing advantages and disadvantages
- Table 2 : Concept of matching the Tgs of traditional 2K clearcoat with a UV-A-cure clearcoat
- Table 3 : The relationship of cure for the systems tested with pendulum hardness, reported in seconds
- Table 4 : Current automotive refinish UV-A products in the market
- Table 5 : Current UV light sources available to tha automotive industryEn ligne : https://drive.google.com/file/d/1gQnzdJrkq6O-eG3SrHqeCakEFjpIbBmk/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38534
in COATINGS TECH > Vol. 19, N° 9 (11-12/2022) . - p. 24-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23758 - Périodique Bibliothèque principale Documentaires Disponible UV curing of pigmented high-build wood coatings based on non-air-inhibited unsaturated polyesters / Michael J. Dvorchak in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 842 (03/1995)
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Titre : UV curing of pigmented high-build wood coatings based on non-air-inhibited unsaturated polyesters Type de document : texte imprimé Auteurs : Michael J. Dvorchak, Auteur Année de publication : 1995 Article en page(s) : p. 49-53 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Peinture couche épaisse' Utilisation Bois Durcissement 'Rayonnement UV' 'Ester polymère' 'Polymère insaturé' 'Réticulation photochimique' Amorceur Index. décimale : 667.9 Revêtements et enduits Note de contenu : - DISCUSSION : Traditional unsatured polyesters - UV-curing of NAI/UPEs - UV-cure equipment - UV photoinitiators
- EXPERIMENTAL : Sample and film preparation - Test protocol, UV-curing devices
- DATA ANALYSIS : UV topcoat based on NAI/UPE resins - UV sealer based on NAI/UPE resins - UV cure of air-dry/NAI/UPE topcoat - Solvent-borne NAI/UPE resins - Water-reducible NAI/UPE resins - Highly pigmented, 100% solids UV-topcoat based on NAI/UPE resinsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18584
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 67, N° 842 (03/1995) . - p. 49-53[article]Réservation
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