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Studies on the effect of cross-linker (HMMM) on aliphatic urethane oils synthesized using enzymatically modified castor oil / Vilas D. Athawale in PAINTINDIA, Vol. LV, N° 11 (11/2005)
[article]
Titre : Studies on the effect of cross-linker (HMMM) on aliphatic urethane oils synthesized using enzymatically modified castor oil Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur Année de publication : 2005 Article en page(s) : p. 53-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Catalyse enzymatique
Composés aliphatiques
Esterification
Groupe hydroxyle
Hexaméthoxy méthyl mélamine
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 ricin et constituants
Réticulants
Revêtement -- Séchage
Revêtements organiques
UrethanesIndex. décimale : 667.9 Revêtements et enduits Résumé : Hydroxyl functional aliphatic urethane oil was synthesised using enzymatically-modified castor oil. Lipase catalysed interesterification of castor oil and linseed oil was carried out at near ambient temperature instead of at higher temperature used in chemically catalysed reactions. The interesterified product was further reacted with isophorone diisocyanate to form -OH terminated urethane oils. Hexa (methoxymethyl) melamine (HMMM) was used as a cross-linker to study the effect of cross-linker on coatings properties of urethane oils.
Very light coloùred urethane oils were obtained. The use of HMMM showed a very significant improvement in drying time, hardness, flexibility, storage stability, solvent resistance and impact resistance. However, as the % of HMMM increased a very poor chemical resistance towards water, acid and alkali was observed.Note de contenu : - EXPERIMENTAL : Materials - Crosslinker - Specifications
- METHODS (SCHEME 1) : Enzymatic interesterification of castor oil and linseed oil - Characterization - Synthesis of urethand oils based on interesterification product
- RESULTS AND DISCUSSION : Enzyme catalyzed interesterification - IR spectroscopy - Coating properties
- Fig. 1 : Structure of HMMM resin
- Fig. 2 : Blend of urethane oil and HMMM
- Fig. 3 : % composition of HMMM vs. pencil hardness in 'H'
- Fig. 4 : Self condensation of HMMM resin
- Table 1 : Acid value and hydroxyl value
- Table 2 : Coating properties of urethane oils using HMMM as a cross-linker
- Scheme 1 : Chemoenzymatic synthesis of urethane oilsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36376
in PAINTINDIA > Vol. LV, N° 11 (11/2005) . - p. 53-70[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 004150 - Périodique Bibliothèque principale Documentaires Disponible Superior coatings from cyclohexanone formaldehyde-CNSL-epoxy blends / Vilas D. Athawale in PAINTINDIA, Vol. LI, N° 7 (07/2001)
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Titre : Superior coatings from cyclohexanone formaldehyde-CNSL-epoxy blends Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; Narendra J. Shetty, Auteur Année de publication : 2001 Article en page(s) : p. 49-52 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau revêtement' Peinture Formulation Liant 'Résine époxyde' 'Noix cajou' Cyclohexanone Formaldéhyde Préparation 'Propriété mécanique' Feuil Séchage Dureté optique' Brillant Adhérence Flexibilité chimique' 'Résistance 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : A comprehensive study of the various coating properties such as drying time, hardness, adhesion, gloss, flexibility, skinning tendency, corrosion, impact resistance and chemical resistance of blends of ketonic (cyclohexanone formalde-hyde)-CSNL-epoxy resin was carried out in the laboratory. The two constituents of the blends were mixed in various blend ratios and their aforesaid coating properties were ascertained. The study revealed that 60:40 percent (w/w) ratio of the two blend components exhibited remarkable improvement in the various coating properties over that of the resins taken individually. Note de contenu : - Materials
- Synthesis
- Test carried out for the study of coating properties
- Drying time
- Hardness
- Gloss
- Adhesion and flexibility
- Storage stability
- Chemical resistance
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12610
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Code-barres Cote Support Localisation Section Disponibilité 001268 - Périodique Bibliothèque principale Documentaires Disponible Superior coatings with alkyd and ketonic resin blends / Vilas D. Athawale in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/00 (11/2000)
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Titre : Superior coatings with alkyd and ketonic resin blends Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; A. V. Chamankar, Auteur Année de publication : 2000 Article en page(s) : p. 57-64 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Because of their low cost and good compatibility with a wide variety of other polymers, alkyd based coatings are used in a large variety of applications. However, to improve their performance, the alkyd resins can be blended with ketonic resins. Such blends were analysed by SEM, and tested for their shelf life. Improvements in properties such as drying time, hardness, adhesion, flexibility, gloss, skinning tendency, impact resistance and chemical resistance were studied. Note de contenu : - Blending to improve the performance of alkyds
- Preparation of the blends
- Simultaneous oxygen activation and solvent evaporation effect fast drying
- Improvement in hardness and gloss
- Increased adhesion
- Ketonic resins serve as stability additives
- Water resistance decreases with increasing ketonic concentration
- High impact resistance due to compatibilityPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11058
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Code-barres Cote Support Localisation Section Disponibilité 000627 - Périodique Bibliothèque principale Documentaires Disponible 000628 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and evaluation of acrylate modified polyurethane dispersion by semibatch emulsion polymerization technique / Vilas D. Athawale in PAINTINDIA, Vol. LIX, N° 7 (07/2009)
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Titre : Synthesis and evaluation of acrylate modified polyurethane dispersion by semibatch emulsion polymerization technique Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; Mona A. Kulkardi, Auteur Année de publication : 2009 Article en page(s) : p. 85-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions
Polymérisation en émulsion
Polyuréthanes
Résines acryliques
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyurethanes dispersions (PUDs) have been an active area of research since the early 1940s because of legislative restrictions on the use of organic solvents in conventional solvent-based products. However, PUDs are not a direct plug-in for the solvent-based polyurethanes. One of the drawbacks of PUDs is their relatively higher cost. To compensate for the higher cost and to improve the property/performance, the PUDs are blended with other low cost acrylic emulsions. Aqueous polyurethane acrylic hybrid emulsion was prepared by emulsion polymerization of a mixture of acrylic monomers (butyl acrylate, styrene, and acrylic acid) in the presence of polyurethane dispersion and characterized by using infrared spectroscopy, particle size analyzer, differential scanning calorimetry and hardness testers. It was found that the thermal resistance, chemical resistance, hardness, glass transition temperature can be noticeably increased by acrylate incorporation in PU matrix. The morphology of hybrid dispersion was well defined and properly controlled by latex composition and compatibility of both phases. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6261
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Code-barres Cote Support Localisation Section Disponibilité 011630 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and structure-property evaluation of polyurethane dispersions based on various dicarboxylic acids / Vilas D. Athawale in PAINTINDIA, Vol. LX, N° 2 (02/2010)
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Titre : Synthesis and structure-property evaluation of polyurethane dispersions based on various dicarboxylic acids Type de document : texte imprimé Auteurs : Vilas D. Athawale, Auteur ; A. Kulkarni, Auteur Année de publication : 2010 Article en page(s) : p. 79-88 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colloides
Dispersions et suspensions
Polyesters
Polyols
Polyuréthanes
Revêtements en phase aqueuse:Peinture en phase aqueuse
Solutions aqueuses (chimie) -- StabilitéIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of polyurethane anionomer dispersions (PUD) was prepared from isophorone diisocyanate, polyester polyol and dimethylol propionic acid as a hydrophilic monomer. The principal polyols used were aromatic, aliphatic and cycloaliphatic type. The effect of polyol type was evaluated in terms of thermal, mechanical and physico-chemical properties of PUD samples. The results revealed that the chain flexibility affected particle-size. During phase inversion the dispersed phase can be more easily broken into smaller particles. The aromatic ring structure of dicarboxylic acid provided the PUD with rigidity which is manifested in high tensile strength, hardness and chemical resistance. However, such coatings suffer limitations with respect to low colloidal and thermal stabiltiy. The studies on film properties revealed that the polyurethane dispersion based on 1, 4 cyclohexane dicarboxylic acid exhibits better properties as compared to aromatic and aliphatic dicarboxylic acids. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9385
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Code-barres Cote Support Localisation Section Disponibilité 012174 - Périodique Bibliothèque principale Documentaires Disponible Synthesis, characterization, and comparison of polyurethane dispersions based on highly versatile anionomer, ATBS, and conventional DMPA / Vilas D. Athawale in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 2 (03/2010)
PermalinkWaterborne PUR-dispersion / Vilas D. Athawale in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/02 (01-02/2002)
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