Dépouillements

Inventive routes for the preparation of waterborne acrylic polyols for 2K PU protective topcoats / David Vanaken in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 19-22 Titre : Inventive routes for the preparation of waterborne acrylic polyols for 2K PU protective topcoats Type de document : texte imprimé Auteurs : David Vanaken, Auteur ; Denis Heymans, Auteur ; Félix Feng, Auteur ; Nathalie Havaux, Auteur Année de publication : 2022 Article en page(s) : p. 19-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions Néodécanoate de glycidyle Polyacryliques Polyols Polyuréthanes Revêtements -- Finition Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The authors summarises all of the recent data published on producing waterborne acrylic polyols for 2K PU topcoats. New regulations, increased awareness and the importance of environmental stewardship lead to a strongly increased demand for waterborne (WB) protective topcoats. However, matching the performance of solventborne (SB) two-component (2K) polyurethanes remains a challenge for resin and paint producers. Synthesis and formulation of primary or secondary dispersions are not straightforward. For secondary dispersions, the removal of solvents from polyols prior to dispersion in water is technically challenging. The emulsion polymerisation process producing primary dispersions often poses problems of water-phase homopolymerisation of the hydroxyl monomers resulting in poor stability of the emulsions, high process grit and insufficient crosslinking of the final coatings. Waterborne acrylic polyols (APO) for 2K urethane finishes have played an important role in enabling regulatory compliance in the industrial market, yet their synthesis can be difficult. This paper introduces two methods to produce high-performance solvent-free waterborne acrylic polyols using either glycidyl neodecanoate or its acrylated adduct. The performance characteristics of coatings made with these waterborne polyols are also demonstrated. Note de contenu : - Waterborne technologies - Waterborne APO secondary dispersions - Performance of waterborne acrylic polyols based on glycidyl neodecanoate - Waterborne APO secondary dispersions conclusion - Waterborne hydroxy-functional emulsions - Primary vs. secondary dispersions - Novel OH-functional emulsions for high-performance WB 2K PU coatings - Waterborne hydroxy-functional emulsion conclusions En ligne : https://drive.google.com/file/d/1Koo1HDSSIlt1dDIXxIGDfBT_lXVQJr7D/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37868 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Enhancing surface durability with antimicrobial coatings / James Rapley in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 23-25 Titre : Enhancing surface durability with antimicrobial coatings Type de document : texte imprimé Auteurs : James Rapley, Auteur Année de publication : 2022 Article en page(s) : p. 23-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Formulation (Génie chimique) Revêtements -- Industrie et commerce Surfaces -- Nettoyage Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses the market for and development of antimicrobial coatings. The need for durable and more environmentally friendly solutions for coating materials has been shaping the coatings industry for many years. Consumers from various markets, including the construction trade and automotive manufacturing, want coatings that enhance the resilience of surfaces to stains, dirt, and mildew. However, even with the addition of protectants and decorative paints or lacquers, microbes are still able to adhere to a surface, where they can multiply rapidly. Their uncontrolled growth and spread as a result of contact, environmental conditions or inadequate cleaning (Figure 1) can then lead to unpleasant consequences, including spoilage, stains, nasty odours and a reduction in the usable lifetime of a product due to contamination or biodegradation. There are a number of treatments that consumers can use to help reduce the growth and spread of microbes on surfaces, and using them regularly is essential. However, standard cleaning products often have limited residual activity, meaning that they stop working once they dry. This can allow surfaces to become quickly re-contaminated by contact or airborne sources, which is a particular concern for high-touch points such as countertops and doors. Antimicrobial technologies in coatings can help to address these challenges by effectively creating a protective layer that keeps surfaces cleaner and fresher for longer. This 'always on' protection works around the clock to help prevent the growth of microbes on a surface for the lifetime of the coating, without washing or wearing away. For just a minimal cost, this universel lifetime preventative measure provides the perfect complement to standard routine cleaning practices, employing a multi-defence strategy against the growth of microbes to improve overall surface cleanliness. Note de contenu : - A growing market - Developing antimicrobial coatings : Choosing the right antimicrobial - Compatibility - Application - The future is cleaner - Fig. 1 : Example of surfaces that are susceptible to microbial growth - Fig. 2 : Choosing an antimicrobial that is compatible with the coating is essential. Left: polyurethane chemistry mixed with an incompatible antimicrobial leads to visuat defects after drying. Right: turnkey coatings are compatible with a wide range of chemistries and have minimal visual impact - Fig. 3 : Current powder or pre-dispersion coating manufacturing process - Fig. 4 : Liquid, dispersion, powder and turnkey coating before and after 72 hours has elapsed. Precipitation and agglomeration start to occur after 72 hours ; the turnkey coating solution remains stable - Fig. 5 : Fully integrated antimicrobial technology in coatings En ligne : https://drive.google.com/file/d/1Ub9MFE1gCgpalSax1V52jjGU9m0ywIoi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37869 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Co-blending, phosphate inhibitors for sustainable, low-cost corrosion control / Ella Newington in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 27-29 Titre : Co-blending, phosphate inhibitors for sustainable, low-cost corrosion control Type de document : texte imprimé Auteurs : Ella Newington, Auteur Année de publication : 2022 Article en page(s) : p. 27-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Coût -- Contrôle Essais de brouillard salin Inhibiteurs (chimie) Mélanges (chimie) Métaux -- Revêtements protecteurs Phosphates Primaire (revêtement) Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses how, with independent research and industry testing, Intelli-ion works synergistically with phosphate-based systems to offer environmental and cost benefits. As professionals working within the coatings industry, we are all acutely aware of the issues that corrosion poses and want to provide our customers and end-users with the best quality products to tackle this US$2,2trn global issue'. Anti corrosion coatings have become a necessity for industries to safeguard the huge investments they make in terms of money, property and safety of workers. Whether coating to protect pipelines, aeroplanes or computer gadgets - customers are united in their battle against corrosion ! Historically, some of the most effective corrosion inhibitors have been based on chromium. However, these chemistries are currently being phased out globally - leaving a gap in the market for a highly effective inhibitor that is non-toxic and non-carcinogenic. Following strong R&D efforts and lengthy extended testing, many coatings companies have turned to phosphate-based systems. This article highlights a step-change alternative that can save 10-30 % on the cost of anti-corrosives as well as offering customers more sustainable coatings that require no hazard warning label. Note de contenu : - WHY PHOSPHATES ARE POPULAR - WHY PHOSPHATE "CO-BLENDS" ARE BETTER : Innovative and trusted technology working together - Removal of toxic warning labels from packaging - Anticorrosive costs savings - EVIDENCE OF INTELLI-ION & PHOSPHATE COMPATIBILITY : Independent academic research at Swansea University wales - Industry-standard salt-spray testing - Fig. 1-3 : Depict the protection mechanism of a co-blended primer coating following the detection of corrosive ions - Fig. 4-5 : Demonstrate Dr. Phit Ansett's independent research aimed at understanding the relationship between Intelli-ion and ZnP - Fig. 6-7 : Demonstrate industry standard salt spray testing (ASTM 8117) of phosphate-based systems left vs Intelli-ion En ligne : https://drive.google.com/file/d/1nMSpxN4McBeWLY7w5KPpH064-95ReTan/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37870 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Intumescent coatings for fire resistance of steel structures : current approaches for qualification and design / Donatella de Silva in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 31-37 Titre : Intumescent coatings for fire resistance of steel structures : current approaches for qualification and design Type de document : texte imprimé Auteurs : Donatella de Silva, Auteur ; Iolanda Nuzzo, Auteur ; Emidio Nigro, Auteur ; Antonio Occhiuzzi, Auteur Année de publication : 2022 Article en page(s) : p. 31-37 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Certification Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Métaux -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Intumescent coatings (lCs) are often used for protecting steel buildings during a fire when the structural, aesthetic, and architectural features of the structural members should be preserved. ICs form a thin protective layer on the steel surface, that if exposed to fire or elevated temperatures, expands in volume with a consequent reduction in density. Hence, the protective layer captures heat and protects the structural member from damage or elevated deformation. This reactive fire protection is designed using prescriptive tables, in which the IC thickness is chosen according to the required fire resistance, critical temperature, and section factor of the steel element. These tables are elaborated on the basis of the tests results according to the UNI EN 13381-8 standard, which is the reference for characterising reactive systems such as ICs. For its reactive nature, this fire protection has to be applied to the structure in a controlled manner, and it is good practice to verify its correct application by measuring thickness and adhesion in situ through regulated methods. The qualification process of IC systems in Italy can be realised through a voluntary certification within the scope of a European technical assessment or by means of a national technical assessment certificate that is mandatory. Ail these aspects related to qualification, assessment, and design of ICs are often ignored by both designers and manufacturers, especially in Italy. Therefore, this paper describes all the approaches, introducing the main technical differences, in order to provide a sort of guideline on the use of these reactive fire protections Note de contenu : - IC TECHNICAL SOLUTION : Inert phase - Transient phase - Steady phase - post-austenitisation phase - QUALIFICATION PROCESS : National qualification process - European qualification process - DESIGN AND CONTROL OF THE APPLICATION : OVERVIEW OF AVAILABLE CODES : Design and verification methods with a prescriptive-based approach - Design and verification methods with a performance-based approach - Control of IC application - Table 1 : Typical table for the prescriptive design of IC thickness - Table 2 : Essential characteristics and relative assessment methods for reactive coating systems according to EAD 350402-00-1106 En ligne : https://drive.google.com/file/d/13svCKQtaUCgP7PwWeePbKr0l2sOPihHv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37871 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Hydrophobically modified hydroxyethyl cellulose (hmHEC) - effective low-shear viscosity builder for latex paints / Artur Palasz in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 40-42 Titre : Hydrophobically modified hydroxyethyl cellulose (hmHEC) - effective low-shear viscosity builder for latex paints Type de document : texte imprimé Auteurs : Artur Palasz, Auteur Année de publication : 2022 Article en page(s) : p. 40-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Concentration pigmentaire volumique Epaississants Formulation (Génie chimique) Hydrophobie hydroxyéthylcellulose Revêtements -- Additifs:Peinture -- Additifs Stabilité au stockage Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Cellulose thickeners are the basic group of rheological modifiers ensuring the viscosity of dispersion paints in the low-shear (Brookfield) and mid-shear forces (Stormer) area. They provide resting viscosity and allow the paint structure to be rebuilt after application to the substrate at higher shear rates (e.g. roller), preventing sagging. Standard grades of hydroxyethyl cellulose as paint thickeners are common and used in both high and low PVC (pigment volume concentration) latex paint formulations. In low-cost contractor's dispersion paints with very high PVC (e.g. ceiling paints), HEC also acts as a binder supporting the binding of pigments and fillers. Unfortunately, typical HEC thickeners do not allow for non-spattering properties when painting with a roller, and such a feature is extremely desirable for the paint market, especially where interior painting is performed by non-professional painters. The solution to this problem cornes with hydrophobically-modified HEC thickeners, the effectiveness of which will be discussed in this article. Note de contenu : - From cellulose to cellulose derivative thickeners - Experimental - Test results and discussion : Viscosity - Sagging - Spattering - Storage stability - Table 1 : Formulation used in case studies of HEC/hmHEC thickeners - Table 2 : Test result and anti-sag index - Fig. 1 : Examples of reaction mechanisms for the formation of cellulose derivatives as thickeners - Fig. 2 : Examples of cellulose ether substitutions - Fig. 3 : Structure of hydrophobically-modified HEC En ligne : https://drive.google.com/file/d/1Rf589j_UyoPk6uGBRKfO7KeA9v-AH23W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37872 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Coatings specialists work with galleries and museums to protect valuable artwork / Kathryn Wortley in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 46-47 Titre : Coatings specialists work with galleries and museums to protect valuable artwork Type de document : texte imprimé Auteurs : Kathryn Wortley, Auteur Année de publication : 2022 Article en page(s) : p. 46-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Objets d'art -- Conservation et restauration Oeuvres -- Peintures Revêtements -- Effets de la lumière:Peinture -- Effets de la lumière Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Museum and gallery professionals have long considered light a double-edged sword — vital to effectively showcase art, yet with the potential to destroy it — but recent innovations in paints and coatings could change that view. Determining the degree of potential light damage on a painting is challenging, according to the US-based Conservation Center for Art & Historic Artifacts, due to the impact of a wide range of factors such as light intensity and type, total time of exposure and the natural resistance of the painting's components. Museums Galleries Scotland, the national development body for the museum sector in Scotland, recommends illuminating very sensitive objects, including watercolours, at 50 lux (1 lux equates to 1 lumen per square metre), which is just "enough to see the shape and colour of an item", it said in a note. Moderately sensitive items, such as oit paintings, can accept 200 lux. But with one standard bulb emitting about 1600 lux, according to the US Department of Energy, and direct sunlight radiating about 32,000-100,000 lux', these recommendations require measures to reduce not only visible light (400-760nm) but also the other two main parts of the light spectrum: infrared radiation (longer than 760nm) and ultraviolet (UV) radiation (shorter than 400nm). UV radiation, which Museums Galleries Scotland says is "the most damaging form of light to museum collections," is emitted from sunlight as well as fabricated fluorescent and traditional tungsten light bulbs. Note de contenu : - Protect with graphene - Protective coatings - Replicated artwork En ligne : https://drive.google.com/file/d/1x3hxacytkiTM9YFPsiCTnbJZCahPt2m7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37873 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23537	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Documents numériques

Polymer Paint Colour Journal Vol. 212, N° 4676 URL