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PAINTINDIA . Vol. LVII, N° 6Mention de date : 06/2007Paru le : 15/06/2007 |
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Ajouter le résultat dans votre panierAssessment of relative reactivities and kinetics of various polyamine and polyamide hardeners with epoxy resins for designing high performance epoxy coatings using differential scanning calorimetry / Girish Mirchandani in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
[article]
Titre : Assessment of relative reactivities and kinetics of various polyamine and polyamide hardeners with epoxy resins for designing high performance epoxy coatings using differential scanning calorimetry Type de document : texte imprimé Auteurs : Girish Mirchandani, Auteur Année de publication : 2007 Article en page(s) : p. 69-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Calorimétrie
Epoxydes
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polyamines
Réticulants
Réticulation (polymérisation)
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : High performance epoxy coatings have to be designed correctly in order to give corrosion protection in hostile environmental conditions. There needs to be a scientific method to accurately determine the reactivity of complex hardeners or a mixture of different hardeners in order to compare them with existing systems and select the correct curing agent for a given epoxy resin. While it may be easy to predict the reactivity of simple hardeners (short chain polyamines) of known chemical structures, the same is not possible for proprietary hardeners of unknown structures. The selection of hardener on the basis of amine value and certain theoretical rules is a misnomer and actual working conditions such as steric hindrance and catalytic effects need to be taken into account. The aim of this paper is to investigate and quantify the relative reactivities of different hardeners and study the curing kinetics of two-component epoxy coatings. Various kinetic parameters (activation energy E, pre-exponential factor A, order of reaction n and rate constant k) have been determined. The kinetic parameters help us to understand the reaction at a molecular level. The differential scanning calorimeter (DSC) was used to determine these parameters. The study has been used to investigate the effect of the amine molecular structure on the reactivity with epoxy resin. The epoxy resin used was diglycidyl ether of bisphenol A (DGEBA) having an EEW of 187 g/equ. Four different curing agents; an aliphatic, cycloaliphatic and aromatic polyamine along with a polyamide (based on dimer fatty acid and polyamine) have been selected for the study. Using kinetic modeling, the reaction mechanism was determined and found to be dependent on molecular mobility, steric hindrance and phase heterogeneity of reactants and cured network. The reaction mechanism changes from autocatalytic for the DGEBA-polyamine system to non-catalytic for the DGEBA-polyamide system. The kinetic model helps us to predict the extent of reaction as a function of time at any temperature. The techniques presented in this paper can be used to design better corrosion resistant coating systems. Note de contenu : - Dynamic experiments
- Isothermal experiments
- Relative reactivity of the hardeners (from isothermal experiments)
- Reaction mechanism (from isothermal experiments)
- Kinetic modeling (to verify autocatalytic and non-catalytic reaction mechanism)
- Kinetic parameters : order of reaction (n et m) and rate constant k
- Activation energy (E) and frequency factor (A)
- Prediction of gel time at any temperature (through kinetic modeling)
- Calculation of optimum curing agent concentration by DSCPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11478
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Code-barres Cote Support Localisation Section Disponibilité 008400 - Périodique Bibliothèque principale Documentaires Disponible Uncaria gambier tannin adhesives for exterior grade plywood / Smita Mathur in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
[article]
Titre : Uncaria gambier tannin adhesives for exterior grade plywood Type de document : texte imprimé Auteurs : Smita Mathur, Auteur ; Pradeep Sharma, Auteur ; K. S. Shukla, Auteur ; P. L. Soni, Auteur Année de publication : 2007 Article en page(s) : p. 93-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colles:Adhésifs
Contreplaqué
Copolymérisation
Formaldéhyde
Gambier
Phénol
TaninsIndex. décimale : 667.9 Revêtements et enduits Résumé : Resins were prepared from phenol formaldehyde and Uncaria gambier tannin by copolymerization at 100°C. Tannin was used to substitute phenol upto 50% using 5, 8 and 11% alkali concentrations. Adhesive formulations and gluing conditions were examined by preparing laboratory 3-ply sal (Shorea robusta) boards (53.34cm x 53.34cm). In order to study the effect of alkali concentration and molar ratio of phenol with tannin, the gluing results obtained were analyzed and it was revealed that the glue shear strength of the plywood can meet the requirements of the Indian Standards IS: 303-1989, for exterior grade plywood. Hence Uncaria gambier tannin would be a desirable substitute for phenol as a low cost material and the studied tannin based adhesive is suitable for industrial application. Note de contenu : - Experimental
- Materials and methods
- Testing
- Results and discussion
- Tannin – phenol – formaldehyde adhesives
- Glue shear strength
- Tannin – phenol – formaldehyde resinPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11479
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Code-barres Cote Support Localisation Section Disponibilité 008400 - Périodique Bibliothèque principale Documentaires Disponible Packaging of paints - A review / Soma Dhirajkumar Roy in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
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Titre : Packaging of paints - A review Type de document : texte imprimé Auteurs : Soma Dhirajkumar Roy, Auteur Année de publication : 2007 Article en page(s) : p. 101-116 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emballages
RevêtementsIndex. décimale : 667.9 Revêtements et enduits Résumé : This article walks us through the different types of packaging material that is used by the paint industry world wide. Why they are prefered ? What are the substrates? Which are the printing techniques? Since there are different type of paints-water based/ solvent based/ powder coating, the packaging media also varies. It starts from the basic Tinplate & extends itself to fluorinated packaging, from liners to laminates, from 80 gsm paper to 7ply corrugated box. The medium of decoration of all the packaging substrates varies from the most popular offset printing to the latest inmold labeling. This subject gives us a basic idea that paint packaging today is exposed to different types of new substrates & shows us the possibility of someday packing solvent based paint in flexible packing- like we have for detergents & oils. This article is an insight into the different substrates currently used in paints packaging. Note de contenu : - History of paint packaging
-What are the different types of packaging materials for paints and why they are used?
- Reinforcements and edgeboards
- How aerosols work
- Different types of industrial paint packaging
- International Maritime Dangerous Goods (IMDG)
- Packaging and recyclingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11480
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Code-barres Cote Support Localisation Section Disponibilité 008400 - Périodique Bibliothèque principale Documentaires Disponible Innovation in ink jet printing / Ed Fesmire in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
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Titre : Innovation in ink jet printing Type de document : texte imprimé Auteurs : Ed Fesmire, Auteur ; David Clark, Auteur Année de publication : 2007 Article en page(s) : p. 118-124 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Impression jet d'encre Index. décimale : 667.9 Revêtements et enduits Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11481
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Code-barres Cote Support Localisation Section Disponibilité 008400 - Périodique Bibliothèque principale Documentaires Disponible New additive to enhance surface cleanability / Gururaj Moharir in PAINTINDIA, Vol. LVII, N° 6 (06/2007)
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Titre : New additive to enhance surface cleanability Type de document : texte imprimé Auteurs : Gururaj Moharir, Auteur Année de publication : 2007 Article en page(s) : p. 137-138 Langues : Anglais (eng) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages.
Energie de surface
Revêtements -- Additifs
Revêtements antisalissures:Peinture antisalissures
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).
Tension superficielleIndex. décimale : 667.9 Revêtements et enduits Résumé : A new silicone-modified crosslinkable acrylate additive has been developed that provides surfaces with easy cleaning characteristics along with many other interesting properties. Note de contenu : - Lotus-effect
- Lotus-effect in coating
- Introduction of a new additive
- Surface energy/ surface tension of the dry film
- Anti-fouling properties
- Practical experiences and applicationsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11482
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