Aller sur edunet
Accueil
Détail de l'auteur
Auteur Pramod Kumar |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la rechercheCNSL-derived polymers for use in surface coatings / K. S. Shukla in PAINTINDIA, Vol. LII, N° 2 (02/2002)
Titre : CNSL-derived polymers for use in surface coatings Type de document : texte imprimé Auteurs : K. S. Shukla, Auteur ; S. Prasad, Auteur ; Pramod Kumar, Auteur ; Deepak Srivastava, Auteur Année de publication : 2002 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Cashew Nut Shell Liquid (CNSL), a by-product of the cashew industry, is one of the potential natural sources of phenols/monomers for the synthesis of a variety resins/polymers for use in surface coatings. CNSL, a dark-coloured product, is obtained from the shell of cashew nut. Cashew tree, Anacardium Accidentale Linn, of Brazil origin, is now being grown extensively in India also. In the present paper, extraction and refining of CNSL has been briefly outlined to get a technically useful product. The chemistry of CNSL and its components has been discussed along with the polymerization of CNSL. Possible modifications of CNSL have been considered to yield useful film-formers for surface coatings of improved technical utility. CNSL-aldehyde resins have been found to be superior to ordinary phenol-aldehyde resins when used in surface coatings, and as insulating materials. The important polymeric materials which have been developed by using CNSL as one of the constituents or a modifier, such as CNSL-aldehyde condensation products, CNSL-modified phenolic resins, polyesters, epoxies and polyurethanes, have been elaborated. Both solvent-borne and waterborne coating formulations have been discussed. Water-dispersible and water-soluble resins with their preparation and properties have been covered in this paper with the purpose to draw guidelines for the designing of ecofriendly polymeric film-formers for surface coatings. Note de contenu : - Extraction of CNSL
- Refining
- Chemistry of CNSL and its components
- Polymerization of CNSL
- CNSL-aldehyde condensation products
- Epoxy resins
- Miscellaneous coating materials
- Water-borne coatingsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12302
in PAINTINDIA > Vol. LII, N° 2 (02/2002) . - p. 29-32[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001278 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Colour Type de document : texte imprimé Auteurs : Pranjal Pandey, Auteur ; Pramod Kumar, Auteur ; S. Chandra, Auteur Année de publication : 2000 Article en page(s) : p. 47-65 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : The importance of measurement of colour quantitatively and comparison for matching of shades of the paint films is very well recognized in paint industry. Colour matching and colour formulation by sophisticated computer gas, in fact, revolutionised the paint manufacturing and application industries acrros the world. In the present article, various theoretical and practical aspects behind appearance of colour in chemical compounds have been presented. Quantification of colour has been discussed in three dimensions, viz. Hue, value and chroma in different colour systems, such as Munsell, CIE and ostwald. Colour comparison made by spectrophotometric methods has also been analysed. Colour difference measurement, shade matching and colour formulation by using sophisticated computer softwre have been elaborated in this article. Note de contenu : - Light primaries
- Colour mixing
- Colour chemistry
- Colour and physical structure
- Human colour vision
- Light sources
- Three dimensions (attributes) of colour
- Colour quantification
- Colour difference measurement
- Colour computer matching
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12656
in PAINTINDIA > N° annuel 2000 (2000) . - p. 47-65[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001247 - Périodique Bibliothèque principale Documentaires Disponible 
Titre : Cost effective alkyds Type de document : texte imprimé Auteurs : Srishti Dixit, Auteur ; Pramod Kumar, Auteur ; R. P. Singh, Auteur Année de publication : 2008 Article en page(s) : p. 27-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides gras
Formulation (Génie chimique)
Huile de linL'huile de lin ou "huile de graines de lin" est une huile de couleur jaune d'or, tirée des graines mûres du lin cultivé, pressées à froid et/ou à chaud ; parfois elle est extraite par un solvant, en vue de l'usage industriel ou artistique, principalement comme siccatif, ou huile auto-siccative.
Les utilisations de l'huile de lin dérivent de sa richesse en acides gras polyinsaturés, en particulier en acides linolénique et linoléique, qui lui doivent leur nom.
L'huile de lin polymérise spontanément à l'air, avec une réaction exothermique : un chiffon imbibé d'huile peut ainsi, dans certaines conditions, s'enflammer spontanément.
Pour ses propriétés de polymère, l'huile de lin est employée seule, ou mélangée à d'autres huiles, résines et solvants, et est utilisée en tant que : Imprégnateur et protecteur des bois à l'intérieur comme à l'extérieur : protection contre l'humidité, les champignons et insectes, et contre la poussière par son caractère antistatique, composant de certains vernis de finition, liant de broyage pour la peinture à l'huile, agent plastifiant du mastic de vitrier, agent durcisseur de diverses préparations, agent de cohérence et liant dans la fabrication du linoléum.
Huile de son de riz
Polyalkydes
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses alkyds resins, which are one of the most common typess used for the formulation of organic coatings.
The popularity of alkyd resins as a binder for coatings is largely due to benefits such as economical balance an uncomplicated application and an outstanding appearance of the films.Note de contenu : - Table 1 : Physicochemical characteristics of linseed oil fatty acids (LOFAs) and rice bran oil fatty acids (RBOFAs)
- Table 2 : Formulation of RBOFA - LOFA alkyds having 60% fatty acids (by weight)
- Table 3 : Physicochemical properties of LOFA alkyd and RBOFA- LOFA alkyds
- Table 4 : Evaluation of LOFA alkyd and RBOFA - LOFA alkyds
- Table 5 : Chemical resistance of the films of the prepared alkyd resins
- Table 6 : Solvent resistance of the films of the prepared alkyd resinsEn ligne : https://drive.google.com/file/d/1AQd-g7FHvaO30mImPWE4wuGE3YJnlZkn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37516
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4527 (08/2008) . - p. 27-28[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 010613 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Development of low-temperature self-curable water soluble polyepoxide coatings for cathodic electrodeposition Type de document : texte imprimé Auteurs : Pramod Kumar, Auteur ; M. K. Trivedi, Auteur Année de publication : 2002 Article en page(s) : p. 45-66 Note générale : Biliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxidised phenol-novolac (EPN) type of polyepoxide resin was used for developing water-soluble cathodically electro-depositable coatings which could be self-curable without using any external/additional cross-linking agent. The self-curing of cathodically deposited films could be effected at a low temperature of 80°C in 30 min, as compared to 150-170°C in 30 min practised presently in many commercial cathodic electro-deposition (CED) installations. In this work, effect of varying molar ratio of secondary amines such as diethanol amine (DEtOA) and diethyl amine to epoxidised phenol-novolac (EPN) on the solubility of EPN-secondary amine adducts prepared at 80, 60 and 30°C for varying reaction times was investigated. Self-curing characteristics of EPN-DEtOA (1:2 moles) adduct at 30-160°C were studied. Kinetics of film growth during CED was investigated by using aqueous solutions of acetic acid neutralised EPN-DEtOA (1:2 moles) adduct. Variables for kinetic studies were deposition time (30-600 s), applied voltage (5-250 V) and solution concentration (1-20% (w/w)). By carrying out CED of polyepoxide films, values of electro-deposition (ED) characteristics found were: ED yield as 5.89 mg/cm2, Coulombic yield as 19.78 mg/C and dry film thickness (DFT) as 52.12 μm. Plots of DFT vs. deposition time (t), DFT vs, t1/2 and current density vs. field strength were drawn to calculate the values of Coulombic efficiency of the process and film conductivity. Cathodically electro-deposited films were finally characterised for physical properties, chemical resistance and corrosion protection performance. Note de contenu : - Equipments - Reactor assembly - Electrodeposition cell
- EXPERIMENTAL PROCEDURES : modifications of EPN resin for cathodic electrodeposition - Determination of Tertiary Amine Value (TAV) of the prepared adduct - Infrared spectroscopy - Cathodic Electrodeposition of films - Determination of degree of cure - Physical examination of film properties - Chemical resistance of films - Protection by films against corrosion
- RESULTS AND DISCUSSION : Effect of molar ration of EPN to DEtOA on the characteristics of adduct - Effect of molar ration of EPN to DEA on the characteristics of adduct - Effect of reaction temperature and time on the characteristics of EPN-DEtOA (1:2 Moles) adducts - Curing characteristics of adduct films - Cathodic Electrodeposition of adduct films - Effect of deposition time on ED characteristics - Effect of applied voltage on ED characteristics - Effect of solution concentration - Effect of solution pH - kinetics of film growth during cathodic electrodeposition - Dry film thickness - Current density - Specific conductivity of the deposited film - Physical properties of films - Chemical resistance of films - Acid resistance - Methanol resistance - Corrosion resistance of films
- CONCLUSIONS : Based on the findings of this work, following conclusions can be drawn
- TECHNOLOGICAL CONTRIBUTION TO COATING INDUSTRYPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12364
in PAINTINDIA > Vol. LII, N° 6 (06/2002) . - p. 45-66[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001282 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Eco-friendly organic coatings based on true self-curable polyepoxides for cathodic electrodeposition Type de document : texte imprimé Auteurs : Aadamvir Singh, Auteur ; Raju, Auteur ; Pramod Kumar, Auteur Année de publication : 2012 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dépôt électrolytique
Epoxydes
Réticulation (polymérisation)
Revêtements
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : True self-curable CED resin system has been developed by using polyepoxide resins based on phenol-novolacs. For this, phenol-novolacs (PNs) of four molar ratios of phenol to formaldehyde viz. 1:0.6, 1:0.7, 1:0.8 and 1:0.9 were synthesized in acidic medium, which were subsequently epoxidized with epichlorohydrin to make epoxy phenol-novolac (EPN) resins of different molecular weights. The prepared resins were characterized by FTIR spectroscopic technique for their structure elucidation and by gel permeation chromatography (GPC) for molecular weight determination. EPNs were reacted with varying molar ratios of a secondary amine; such as diethanolamine (DEtOA), to produce EPN-DEtOA adducts having tertiary amino groups introduced into their molecules. The suitable molar ratio of DEtOA to EPN varied with the molecular weight of EPN, which was higher for EPN of higher molecular weight. These tertiary amino groups would, in fact, initiate the self-curing (polymerization) of resins as applied films, by using free epoxy groups of epoxy-amine adducts, via anionic polymerization. As a consequence, EPN-DEtOA adducts could self-cure without any additional/external crosslinker, even in the co-reacted form. The adducts (modified EPNs) were rendered water-soluble by neutralizing with acetic acid. Aqueous solutions of acetic acid-neutralized adducts were used as electrolytic compositions for the deposition of films of modified polyepoxide (adduct) coatings on metallic panel (workpiece) used as cathode of the electrodeposition cell. By carrying out judiciously planned experiments for cathodic electrodeposition, the electrodeposition characteristics, such as electrodepo- sition yield, dry film thickness and coulombic yield, were determined and optimized. The cathodically electrodeposited films, after self-curing, were characterized for their physical properties, chemical resistance and corrosion protection performance. Note de contenu : - EXPERIMENTAL : Materials - Methods - Synthesis of CED coating binders - Cathodic electrodeposition of films
- RESULTS AND DISCUSSION : FTIR spectroscopy - Gel permeation chromatography (GPC) - Characteristics of polyepoxide (EPN) resin - Cathodic electrodeposition of adduct films - Self-curability of adduct as cathodically electrodeposited films - Physical properties of CED films - Chemical resistance properties of CED films - Corrosion protection performance of CED filmsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15651
in PAINTINDIA > Vol. LXII, N° 6 (06/2012) . - p. 55-62[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 14083 - Périodique Bibliothèque principale Documentaires Disponible
Permalink
PermalinkPermalink
Permalink
Permalink
Permalink
