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Functional & specialty coatings for enhanced end use performance / Mukesh Kumar Madhup in PAINTINDIA, Vol. LXIX, N° 11 (11/2019)
[article]
Titre : Functional & specialty coatings for enhanced end use performance Type de document : texte imprimé Auteurs : Mukesh Kumar Madhup, Auteur Année de publication : 2019 Article en page(s) : p. 88-98 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.
Adhésion
Anticorrosifs
Anticorrosion
Epoxydes
Essais de brouillard salin
Hydrophobie
Matériaux -- Propriétés fonctionnelles
Polyuréthanes
Résistance à l'abrasion
Revêtement antireflet
Revêtements anti-graffitis
Revêtements bi-composant
Revêtements organiques
Revêtements protecteurs
Surfaces -- NettoyageIndex. décimale : 667.9 Revêtements et enduits Résumé : The coating materials which provide specific performance outcomes are called functional and specialty coatings. Application of functional coatings are becoming increasingly popular with the technology progress in material science field and continuous research in specialty coating segment. By using right functional/specialty coating, it is possible to achieve specific coating propergies like anti-corrosion, anti-corrosion, anti-erosion, anti-wear and chemical resistance, infra-red rejection, enhanced light transmission, electrical dissipation etc. Applications of these coatings are carried out over variety of substrates including but aluminum, glass etc. to deliver the special properties for which it is designed. Note de contenu : - INTRODUCTION : Anticorrosive coatings - Specimen preparation - Antireflection coating - Principle of AR coating - Specimen preparation for testing antireflection property - Antigraffiti coating with hydrophobic property - Specimen preparation for testing antigraffiti property
- Fig. 1 : Representation of an electrochemical cell which causes anode to degrade in presence of electrolyte
- Fig. 2 : Metallic corrosion in environment in presence of water/moisture and formation of electrochemical cell
- Fig. 3 : 3M scotchkote anticorrosion coating after 50000 Hrs. in salt spray as per ASTM B-117
- Fig. 4 : Principle of reflection and enhancement of reflection of light using nanocoating
- Fig. 5 : Comparative %T (gain) of wavelength between 300-1200 nm for coated and uncoated glass. Increase of 2.5~3.0% light tranmission (single side coated glass)
- Fig. 6 : Figure depicting schematic representation of surface morphology for repellency of dirt and easy to clean property
- Fig. 7 : Determination of graffiti resistance by D6578/D6578M - 13
- Fig. 8 : Antigraffiti coating having hydrophobic property applied over coated and uncoated glass substrate
- Fig. 9 : 60 days exposed glass panels and water washed with same force
- Fig. 10 : Adhesion of the coating over, direct on FRP, PU coaing and mild steel (emery cleaned)
- Fig. 11 : Hot water soak adhesion tested specimens for 38 days at 95°C
- Fig. 12 : Comparative study of advanced abrasion resistance epoxy coating (AREC) versus conventional 2K liquid epoxy coating for abrasion resistance testing as per ASTM D4060
- Table 1 : Various test properties of advanced anticorrosion 2 pack epoxy coatingEn ligne : https://drive.google.com/file/d/1DtlhhQ7xuv3X2QA-DdsnZT0xoZZSImqx/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33636
in PAINTINDIA > Vol. LXIX, N° 11 (11/2019) . - p. 88-98[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21460 - Périodique Bibliothèque principale Documentaires Disponible Further development of low-viscosity polyester polyols for high-solids 2K polyurethane coatings in COATINGS WORLD, Vol. 24, N° 3 (03/2019)
[article]
Titre : Further development of low-viscosity polyester polyols for high-solids 2K polyurethane coatings Type de document : texte imprimé Année de publication : 2019 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorbeurs de rayonnement ultraviolet
Adhésion
Décoloration
Dureté (matériaux)
Epoxydes
Formulation (Génie chimique)
Haut extrait sec
Polyaspartiques
Polyesters
Polyols
Polyuréthanes
Résistance au rayonnement ultraviolet
Résistance aux conditions climatiques
Résistance chimique
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements bi-composant:Peinture bi-composant
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : Formulators are required to comply with increasingly stringent VOC regulations and, at the same time, maintain the performance characteristics expected from the coating system. Traditionally, there have been three ways to reduce VOCs in coatings: by moving toward waterborne formulations, making higher solids coatings, or using “exempt” solvents. Waterborne technology greatly reduces the VOC content, but commonly lags behind the performance of solventborne coatings, while high solid systems are typically less economical per gallon. Systems containing exempt solvents can only be used from a regulatory point of view in specific areas of the globe. In order to overcome these challenges, we developed a new set of polyester polyols with low room temperature viscosities that reduce VOC content in coating formulations and provide excellent coating characteristics. This work demonstrates the use of these polyols in 2K polyurethane solventborne low VOC systems and describes their performance characteristics in preventative maintenance and floor coatings. This paper includes discussion of the adhesion to various metals and plastics, extended weatherability performance and starting point formulations. Note de contenu : - Picture 1 : Chemical immersion resistance test of a composite formulation sample.
- Fig. 1 : Calculated VOC levels for standard developmental resin coating formulations
- Fig. 2 : Shore D coating hardness for standard and developmental resin coating formulations
- Fig. 3 : Pencil hardness for standard and developmental resin coating formulations
- Fig. 4 : Abrasion resistance for standard and developmental resin coating formulations
- Fig. 5 : Total weight change of the standard and developmental resin coating formulation composites after four weeks immersion in various chemicals
- Fig. 6 : QUV-A gloss stability of coating formulations without UV absorbers
- Fig. 7 : QUV-A gloss stability of coating formulations with UV absorbers
- Fig. 8 : QUV-A color change, δE of coating formulations without UV absorbers
- Fig. 9 : QUV-A color change, δE of coating formulations with UV absorbers
- Table 1 : Commercial resin standards
- Table 2 : Developmental high-functional, low-viscosity polyols
- Table 3 : 2K polyurethane formulations
- Table 4 : 2K aspartic resin formulations
- Table 5 : 2K epoxy resin formulations
- Table 6 : ASTM standards used
- Table 7 : Cross Hatch adhesion summary
- Table 8 : Polyurethane coating mechanical properties
- Table 9 : Coating formulations weathering studies
- Table 10 : Developmental resin compatibilityEn ligne : https://www.coatingsworld.com/issues/2019-03-01/view_technical-papers/further-de [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32508
in COATINGS WORLD > Vol. 24, N° 3 (03/2019)[article]Future materials for lightweight construction and design / Christian Trassl in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 2 (02/2014)
[article]
Titre : Future materials for lightweight construction and design Type de document : texte imprimé Auteurs : Christian Trassl, Auteur ; Volker Altstädt, Auteur Année de publication : 2014 Article en page(s) : p. 60-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Habitacles
Isolation thermique
Matériaux -- Allègement
Matières plastiques dans les automobiles
Mousses plastiques
Particules (matières)
Polyéthylène
Polypropylène
Polyuréthanes
ThermoplastiquesUne 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.Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic particle foams are known for their excellent thermal insulation ability and outstanding lightweight construction potential. They combine low density in the range of 15 to 80 kg/m3 with good mechanical properties and high specific energy absorption. By means of innovative surface modifications, they are also gaining in importance in the “design” and “automotive interior” fields. Note de contenu : - Characteristic surface
- Mold technology, laminating and lacquering
- Lighter interiors
- Design and functional elementsEn ligne : https://drive.google.com/file/d/1I4KYCrPApiO_a9TB4ZpwCposyvCPllqV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21282
in KUNSTSTOFFE INTERNATIONAL > Vol. 104, N° 2 (02/2014) . - p. 60-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16202 - Périodique Bibliothèque principale Documentaires Disponible Future of synthetic polymers in cosmetics / Laurence Pottié in SOFW JOURNAL, Vol. 145, N° 11 (11/2019)
[article]
Titre : Future of synthetic polymers in cosmetics : How polyurethane polymers can solve the efficacy and environmental impact silemma Type de document : texte imprimé Auteurs : Laurence Pottié, Auteur Année de publication : 2019 Article en page(s) : p. 8-12 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cosmétiques -- Aspect de l'environnement
Industrie cosmétique -- Aspect de l'environnement
Innovations
Matériaux filmogènes
Microplastiques
Polymères -- Biodégradation
Polymères -- Emploi en cosmétologie
PolyuréthanesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Ingredients of cosmetic products end their life to a large extent in wastewater streams or in some cases in surface water. As a result their potential environmental impact and persistency recently raised attention. In particular, the European chemical agency (ECHA) published early 2019 a proposal to restrict the use of intentionally added microplastics in cosmetics and other products. The proposal is still in the consultation phase at the moment this article is written and should enter into force in 2020.
Although the restriction only applies to solid particles, the discussions have nowadays extended to all types of synthetic polymers, often wrongly categorized as microplastics or as persistent in the environment. However, liquid film forming polymers do not fulfill the microplastic definition, and some liquid polymers such as polyurethanes can be biodegradable. These examples show the necessity to carefully distinguish between synthetic polymer types while formulating. In this paper an overview of the regulatory and environmental profile of various cosmetic polymers is given, with focus on film forming polymers.Note de contenu : - The ECHA definition of microplastics
- End of life of microplastics and liquid polymers
- Biodegradability of polymers
- Innovation perspectives
- Fig. 1 : The microplastics restriction proposal is one of the European initiatives to promote innovation towards non persistent ingredients
- Fig. 2 : Film forming polymers, independently of their chemistry of biodegradability potential, are outside the scope of the microplastics restriction proposal
- Fig. 3 : Microplastics, liquid and soluble polymers used in cosmetics usually end their life in the domestic waste water
- Fig. 4 : The segmented structure of a polyurethane polymer enables introducing biobased building blocks and optimizing its biodegradability while tuning the properties for various applications
- Fig. 5 : High humidity Curl Retention (HHCR) curves of representative film formers typically used in hair styling products. Biodegradation values were determined using the OECD 301 standardEn ligne : https://drive.google.com/file/d/1s7a3OP45gGuJHSQrEVbu6rRUkWvTPUWp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33576
in SOFW JOURNAL > Vol. 145, N° 11 (11/2019) . - p. 8-12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21326 - Périodique Bibliothèque principale Documentaires Disponible Gallic acid-derived phosphorus-based flame-retardant multifunctional crosslinking agent for PU coating / Megh Patel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
[article]
Titre : Gallic acid-derived phosphorus-based flame-retardant multifunctional crosslinking agent for PU coating Type de document : texte imprimé Auteurs : Megh Patel, Auteur ; Siddhesh Mestry, Auteur ; Sonam Pratik Khuntia, Auteur ; Shashank T. Mhaske, Auteur Année de publication : 2020 Article en page(s) : p. 293-303 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chimie analytique
Formulation (Génie chimique)
Humidité -- Absorption:Eau -- Absorption
Hydrolyse
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Phénoliques, AcidesUn acide-phénol (ou acide phénolique) est un composé organique possédant au moins une fonction carboxylique et un hydroxyle phénolique. La pratique courante en phytochimie consiste à réserver ce terme aux dérivés de l’acide benzoïque et de l’acide cinnamique.
Les acides hydroxybenzoïques dérivent par hydroxylation de l’acide benzoïque avec une structure de base de type C6-C1. Ces hydroxyles phénoliques OH peuvent ensuite être méthylés.
Exemples : l'acide gallique, élément constitutif des tanins hydroxylables et l'acide vanillique dont l'aldéhyde, la vanilline, est bien connue comme l'arôme naturel de vanille.
Les dérivés de l'acide cinnamique, les acides hydroxycinnamiques ont une structure de base de type C6-C3. Ils appartiennent à la grande famille des phénylpropanoïdes. Les hydroxyles phénoliques OH de ces dérivés peuvent aussi être méthylés (-O-CH3).
Exemples : l'acide paracoumarique, dont les lactones, les coumarines, sont largement distribuées dans tout le règne végétal, l'acide caféique, très large représentation chez les végétaux, souvent sous forme de l'acide chlorogénique (ester avec l'acide quinique), comme dans le grain de café, la pomme ou sous forme d'acide 1,3-dicaféylquinique (cynarine) dans l'artichaut et d'acide rosmarinique dans le romarin et le thé de Java (orthosiphon), l'acide férulique et l'acide sinapique.
Dans les plantes, ces acides-phénols sont souvent sous forme d'esters d'alcools aliphatiques ou d'esters de l'acide quinique, de l'acide rosmarinique ou de glycosides.
Polyuréthanes
Réticulants
Revêtements -- Propriétés mécaniques
Revêtements -- Propriétés thermiques
Revêtements organiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : The synthesis of the multifunctional phosphorus-based flame-retardant crosslinking agent is presented here. Gallic acid was selected as a raw material for the production of the desired product because of its availability (bio-based), multifunctional structure, and applicability of the various chemistries. Along with the carboxylic acid group, hydroxyl groups also have the tendency to react with the replaceable halogenated compounds and it was necessary to protect the hydroxyl groups by acetylation. The synthesis procedure follows acetylation, reaction with phenylphosphonic dichloride (PPDC), and deacetylation to obtain the final product (GA-P). The structure confirmation and the progress of the reactions were confirmed using hydroxyl and acid values, Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy. The formed product was used as a crosslinking agent to produce the polyurethane coatings with different loadings and various thermal, mechanical, and flame-retardant properties that were studied. The thermal and the flame-retardant properties showed significant increase with increasing concentration of GA-P which were studied using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), limiting oxygen index (LOI), and UL-94 tests. The coating with the highest concentration of GA-P showed 27 LOI and self-extinguishing behavior within 10 s of ignition. The mechanical properties deteriorated with increasing concentration of GA-P due to the increased brittleness and crosslinking density. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of acetylated gallic acid (GA-Ac) - Reaction of GA-Ac and POCl3 - Hydrolysis of GA-Ac-P - Formulation of the coating films - Characterization
- RESULTS AND DISCUSSION : Physicochemical analysis - FTIR and NMR analysis - Thermal properties - Gel content and water absorption - Mechanical properties - FR propertiesDOI : 10.1007/s11998-019-00273-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00273-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33746
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 293-303[article]Réservation
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