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PAINTINDIA . Vol. LXVII, N° 6Mention de date : 06/2017Paru le : 15/06/2017 |
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Titre : Cholesteric liquid crystal pigments Type de document : texte imprimé Auteurs : Yash Melkeri, Auteur ; Tipanna Melkeri, Auteur Année de publication : 2017 Article en page(s) : p. 55-58 Langues : Anglais (eng) Catégories : Iridescence L’iridescence (aussi connu sous le nom de goniochromisme) est la propriété de certaines surfaces qui semblent changer de couleur selon l'angle de vue ou d'illumination. Des exemples d'iridescence comprennent notamment : les bulles de savon, les ailes de certains papillons, certains coquillages et certains minéraux. L'iridescence est souvent créée par une coloration structurelle de microstructures qui interfèrent avec la lumière.
Matières plastiques
Opacité (optique)
Pigments
Polymères à cristaux liquides cholestériques
Procédés de fabrication
Revêtements poudre:Peinture poudre
Revêtements:Peinture
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.2 Colorants et pigments Résumé : Effect pigments are specialty pigments, display a wide range of properties such as colour-travel, reflect or refract light, act as a mirror (metal flakes) and multiple colour effect called Iridescence. Liquid crystals (LCs) are molecules that enter a state of malter showing characteristics of both isotropic melt and the ordered crystal when heated above their melting point. In liquid crystal polymer pigments (LCP pigment), a cholesteric phase is fixed by crosslinking therefore they also called cholesteric liquid crystal (CLC) pigments. CLC based pigment have excellent blue shifting colour travel. Most CLC pigments are based on polysiloxane. CLC Pigments are easily dispersed and compatible with most binder systems including water, solvent, and powder vehicle systems. Currently Wacker is the only commercial producer of CLC pigment under brand of Helicone HC. CLC pigments are used in both water and solvent based Paints. They also used in plastics due to their heat stability and resistance towards shear force. Note de contenu : - Application in liquid paint
- Application in powder coatings paints
- Application in plastics
- FIGURES : 1. Structure of nematic LC phase - 2. Twisted nematic LC - 3. Opacity and liquid crystal phase - 4. Cholesteric liquid crystal structure - 5. Iridescence effect in CLC pigment - 6. Colour travelling in CLC pigments - 7. History of CLC pigments - 8. Four different coloured helicone HC pigments - 9. CLC pigment manufacturing processEn ligne : https://drive.google.com/file/d/1vh2IA0WTfm_-mTYJAyWhT-hOiK2KQ0Tg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28978
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 55-58[article]Réservation
Réserver ce documentRecent advances in isocyanate free coating technologies as an alternate to hazardous isocyanate cured polyurethane coating / Sangram Ghosh in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
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Titre : Recent advances in isocyanate free coating technologies as an alternate to hazardous isocyanate cured polyurethane coating Type de document : texte imprimé Auteurs : Sangram Ghosh, Auteur ; Nirmalya Dey, Auteur Année de publication : 2017 Article en page(s) : p. 60-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Durée de vie (Ingénierie)
Polyaldéhyde
Polycarbamate
Revêtements sans isocyanates
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Isocyanate based polyurethane (PU) paints are well established in the coating world. PU coatings are characterized by their excellent durability, toughness, chemical resistance and stain resistance. PU coatings are used in various fields of applications such as in marine and protective coating, general industrial coatings, automotive coatings and even in architectural coating segments. However, various health, safety and environmental (HSE) legislations are limiting the use of isocyanate due to its toxicity related hazards. Also the use of renewable and green resources is gaining importance as the paint industry is gradually shirting towards eco-friendly and sustainable developments. ln this scenario non-isocyanate polyurethane and other isocyanate free coating technologies are creating a new way of thinking for the paint industry especially for ambient cured system. Few coating manufacturers have already developed and established their products based on isocyanate free chemistry. In this article, various technological approaches and recent advancements in this field have been reviewed in detail. Performance of these new chemistries in comparison to conventional isocyanate based PU has also been covered. It is expected that, the use of isocyanate free coating technology will usher a new way of sustainability for the paint industry. Note de contenu : - STATE-OF-THE-ART IN CONVENTIONAL PU COATING : Two pack airdrying polyurethane - Single pack moisture cured PU
- TOXICITY AND HAZARDS ASSOCIATED WITH ISOCYANATE EXPOSURE
- DEVELOPMENTS IN ISOCYANATE FREE POLYURETHANE CHEMISTRY AND OTHER ALTERNATIVE TOPCOATS : Non-isocyanate polyurethane (NIPU) - NIPU formation reaction - hybrid non isocyanate polyurethane (HNIPU) - Renewable resource based NIPU - Use in NIPU in coatings - Use of HNIPU as sealants and floor coating - Use of HNIPU as sprayable PU foam - Isocyanate free polyurethane using polyaldehyde and polycarbamate - Key features of polyurethane obtained from polyaldehyde and polycarbamate - Alternate isocyanate free coating using malonate and acrylol - Pot life inhibition problem associated with Michael reaction - Acure technology - Comparison of acure with with conventional isocyanate based coatingEn ligne : https://drive.google.com/file/d/1kO3hDgwTyH6_9FYvteE2dbPYfpvZLxSn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28979
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 60-70[article]Réservation
Réserver ce documentUltrasonication for better pigment dispersion / Ashwani Upadhyay in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
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Titre : Ultrasonication for better pigment dispersion Type de document : texte imprimé Auteurs : Ashwani Upadhyay, Auteur ; Shaifali Tyagi, Auteur Année de publication : 2017 Article en page(s) : p. 71-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cavitation
Dioxyde de titane
Dispersions et suspensions
Nanoparticules
Noir de carbone
Pigments
Polymères
Revêtements:Peinture
UltrasonsIndex. décimale : 667.2 Colorants et pigments Résumé : In paint industries one of the biggest challenges in the manufacturing process is to disperse nanoparticles into the vehicle, only the wel I separated nanoparticles can lead to unique new properties of the composite I ike a simultaneous improvement of toughness and stiffness already at very low filler contents. These particles are held together by attraction forces of various physical and chemical nature, including Van der Waals forces and liquid surface tension. This effect is stronger for higher viscosity liquids, such as polymers or resins. Different technologies are commonly used for the dispersing of powders into liquids. This includes high pressure homogenizers, agitator bead mills, impinging jet mills and rotor-stator-mixers. Another possibility is the dispersion by the help of ultrasonic waves. When sonicating liquids the sound waves that propagate into the liquid media result in alternating high-pressure and low-pressure cycles. This applies mechanical stress on the attracting electrostatic forces. Such jets press liquid at high pressure between the particles and separate them from each other. This review article discusses the use of ultrasonic waves in pigment dispersion, mechanism, and its application in paint industries. Note de contenu : - ULTRASONIC
- ULTRASONIC CAVITATIONS : Type of cavitations - Collapse of transient cavities
- ULTRASONIC DISPERSION EQUIPMENTS : Specifications : Lab ultrasonifictors instruments - The QS1 system - Titanium probes - The QS4 system - Titanium probes - Working - Factors affecting ultrasonication - Amplitude - Vapor pressure - Temperature - Viscosity and concentration - Power and intensity vs. energy - Surface tension - Air and gas content
- DEMONSTRATION OF ULTRASONIC MILLING AND DISPERSING EFFECTS BY MEANS OF SPECIFIC MATERIAL EXAMPLES : Titanium dioxide - Dispersion of nonmaterial's in polymers - Ultrasonic dispersion as compared to normal dispersion has following featuresEn ligne : https://drive.google.com/file/d/1AZbzkH87HvkQ15xmlsrYYQwsEH3elD51/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28980
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 71-76[article]Réservation
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Titre : Paint manufacturing machines Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2017 Article en page(s) : p. 86-90 Langues : Anglais (eng) Catégories : Procédés de fabrication
Revêtements -- Appareils et matériels:Peinture -- Appareils et matériels
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.6 Peintures Résumé : Let’s now turn our attention to the most sophisticated Machine called "Horizontal Mill." Generally these machines are preferred by Pigment and fine Dye manufacturers. But gradually with time much awareness has been created and paint manufacturers have started using these machines. Initially they were preferred for Enamel manufacture, but in due course people started using these machines to make Water based paints. These machines have certain distinct advantages over the High Speed Dispersers. The grinding is very fine and it passes more than 7.0 in Hegman Gauge. Further, due to fine grinding of the extenders present in the paint premix, they exhibit a special luster to the paint film. This in turn adds more gloss to the final coating without increasing the Emulsion percentage in the formulation. The brushability and covering capacity per litre increases distinctly without sacrificing the opacity. En ligne : https://drive.google.com/file/d/1CGoXipC0zJ8N5HiBj9AQwbrw02CGk2Ux/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28981
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 86-90[article]Réservation
Réserver ce documentCharacteristics of anticorrosive pigments used in primers / Mukund Hulyalkar in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
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Titre : Characteristics of anticorrosive pigments used in primers Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2017 Article en page(s) : p. 92-94 Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Pigments inorganiques
Primaire (revêtement)Index. décimale : 667.9 Revêtements et enduits En ligne : https://drive.google.com/file/d/1GPbGL6Xvvwk_epXtyNU-ri_Ltt1NcNlr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28982
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 92-94[article]Réservation
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Titre : Thermoplastic acrylic paint Type de document : texte imprimé Auteurs : Mukund Hulyalkar, Auteur Année de publication : 2017 Article en page(s) : p. 96 Langues : Anglais (eng) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Formulation (Génie chimique)
Polyacryliques
Revêtement émail:Peinture-émail
Revêtements organiques
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 : 667.6 Peintures Résumé : The use of the thermoplastic type of acrylic resin as a modifier for improving properties of the other resins has been demonstrated. The acrylic resin is used as the major resin componene in an automotive type enamel. En ligne : https://drive.google.com/file/d/1hRcweMvSEZiL6KgVrrMyYVtBxTqZ1Sy1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28983
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 96[article]Réservation
Réserver ce documentCorrosion in food processing industry / Durgesh Kumar Soni in PAINTINDIA, Vol. LXVII, N° 6 (06/2017)
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Titre : Corrosion in food processing industry Type de document : texte imprimé Auteurs : Durgesh Kumar Soni, Auteur ; P. K. Kamani, Auteur Année de publication : 2017 Article en page(s) : p. 104-114 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier inoxydable
Corrosion
Industries agro-alimentaires -- Salubrité
Matériaux pour les industries agro-alimentairesIndex. décimale : 667.9 Revêtements et enduits Résumé : One of the most important parts in food chain is to consume safe and hygienic food with a good quality. It is really important to keep the food safe from beginning i.e. during its production and all other stages in food distribution, storage, and consumption. Food processing industry is one of the largest manufacturing industries around the world. In a typical food processing plant, equipment of varying ages, constructed of a myriad of materials, including carbon steel, aluminum, stainless steel, copper and plastics can be found. Corrosion is an enemy of many of these materials. The maintenance department of food processing plant battle against the effects of corrosion constantly for necessary food quality requirements. The requirements of food quality lead most plants to use stainless steel as the main material for equipment. Note de contenu : - THE GENERAL CONSIDERATIONS : Possible toxic effects - Hygiene
- FOOD PRODUCT ENVIRONMENTS
- EFFECT OF BACTERIA IN FOOD ENVIRONMENT : Emulsified environments
- DAIRY INDUSTRIES : Milk and its derivative - Materials used in the dairy industry
- BEVERAGE INDUSTRIES : Beer and concrete - Beer and brewery equipment
- CORROSION IMPACT ON FOOD INDUSTRIES : Under deposit corrosion - Galvanic corrosion
- STAINLESS STEEL IN FOOD INDUSTRY : Advantages of stainless steel
- TABLE : Typical applications of the various stainless steel typesEn ligne : https://drive.google.com/file/d/158jpwJ1og95SlhgWMuiM2wd-8keQIsHT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28984
in PAINTINDIA > Vol. LXVII, N° 6 (06/2017) . - p. 104-114[article]Réservation
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