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Novel chlorinated film formers for high performance coatings / S. Bhandari in PAINTINDIA, Vol. XLV, N° 7 (07/1995)
[article]
Titre : Novel chlorinated film formers for high performance coatings Type de document : texte imprimé Auteurs : S. Bhandari, Auteur ; S. Chandra, Auteur Année de publication : 1995 Article en page(s) : p. 19-35 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture Liant 'Polymère chlore' 'Résine alkyde' Préparation Chloration 'Huile soja' 'Corps gras végétal' époxyde' 'Polyacrylate de butyle' 'Copolymère acrylate méthacrylate méthyle' 'Propriété thermique' mécanique' chimique' Feuil 'Article synthèse' Index. décimale : 667.9 Revêtements et enduits Résumé : Chlorinated alkyds, epoxy esters and butyl acrylate-méthyl methacrylate (BA-MMA) copolymers were synthesised by bubbling dry chlorine gas in carbon tetrachloride solution. The chlorination of DCO alkyd was studied both in the absense as well as in the presence of iodine catalyst. Soybean and nigerseed oil alkyds and linsseed oil epoxy ester were, however, chlorinated without catalyst only. The chlorination of BA-MMA copolymer was performed in the presence of UV light.
It was found that the maximum chlorine content of about 50-55 per cent could be achieved in DCO, soybean and nigerseed oil alkyds and linseed oil epoxy ester. Five samples each of chlorinated DCO, soybean and nigerseed oil alkyds and four samples of chlorinated epoxy ester, varying in the chlorine content, were synthesized in order to study the effect of chlorine. In the case of BA-MMA copolymer maximum chlorine content about 26 per cent was obtained. One more sample of chlorinated BA-MMA copolymer, with lesser chlorine content, was synthesized for comparison purposes.
It was confirmed through IR spectroscopy that chlorine enters only into the aliphatic portions of all the three alkyds and epoxy ester molecules by addition and substitution reactions and only into the aliphatic main chain of the BA-MMA copolymer molecule by substitution reaction.
Thermal stability of all the chlorinated products was determinated by the Bloomfield test and by the weight loss procedure and compared with that of the commercial sample of chlorinated rubber. It was found that the termal stability increases with the chlorine content. In the case of chlorinated BA-MMA copolymers, the thermogravimetric analysis (T.G.A) was also carried out which further confirmed that the thermal stability increases with the chlorine content.
All the products were characterized for sulubility, compatibility, colour viscosity, iodine value, epoxide equivalent and molecular weight. The mechanical and chemical film properties were also appraised simultaneously which revealed that, in general, the cholorinated products possessed superior film properties as compared to those of the unchlorinated ones expect in terms of flexibility and adhesion and solvent resistance.
All the chlorinated products also passed the standard tests for protection against corrosion and resistance to salt-spray and fire, justifying their application in high performance coatings.Note de contenu : - Important materials
- Chlorinated DCO alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated soybean oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated nigerseed oil alkyds : Preparation of alkyd - Chlorination - Samples prepared
- Chlorinated epoxy esters : Preparation of epoxy ester - Chlorination - Samples prepared
- Chlorinated acrylics : Preparation of poly (butyl acrylate) - Chlorination - Preparation of chlorinated butyl acrylate-methyl methacrylate (BA-MMA) copolymer - Sample prepared
- Characterization : Solubility and compatibility - Colour - Viscosity - Addition/substitution of chlorine - Thermal stability
- Evaluation : Drying time - Flexibility and adhesion - Impact resistance - Scratch hardness - Water, acid and alkali resistance - Solvent resistance - Protection against corrosion - Resistance to salt-spray - Fire resistancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13620
in PAINTINDIA > Vol. XLV, N° 7 (07/1995) . - p. 19-35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006454 - Périodique Bibliothèque principale Documentaires Disponible Soy-based UV-curable thiol–ene coatings / Zhigang Chen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)
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Titre : Soy-based UV-curable thiol–ene coatings Type de document : texte imprimé Auteurs : Zhigang Chen, Auteur ; Bret J. Chisholm, Auteur ; Radhika Patani, Auteur ; Jennifer F. Wu, Auteur ; Shashi Fernando, Auteur ; Katie Jogodzinski, Auteur ; Dean C. Webster, Auteur Année de publication : 2010 Article en page(s) : p. 603-613 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements -- Séchage sous rayonnement ultraviolet Tags : Revêtement 'Séchage sous UV' 'Huile de soja' 'Thiol-ene' Index. décimale : 667.9 Revêtements et enduits Résumé : Novel soy-based thiols and enes were synthesized and characterized. Then, soy-based thiol–ene UV-curable coatings were formulated and their coating physiochemical properties were investigated in detail. The use of biorenewable resources, combined with environmentally friendly UV-curable technology, provides a “green + green” solution to the stricter regulations in the coatings industry. Novel soy-based thiols and enes were synthesized through the Lewis acid-catalyzed ring opening reaction of epoxidized soybean oil with multifunctional thiols or hydroxyl functional allyl compounds. FTIR and NMR confirmed the formation of the target compounds. The soy-based thiols and enes were formulated with petrochemical-based enes and thiols, respectively, to make thiol–ene UV-curable coatings. Typical coating film properties, thermal properties, and photopolymerization kinetics of these coatings were studied. Soy-based thiol–ene coatings having lower functionality thiols and enes have poor UV curability and coating properties, which was attributed to the lower crosslink density. Soy-based thiols and enes with higher functionality can be UV-cured in combination with petrochemical-based enes or thiols even without the presence of free radical photoinitiators. Better coating film properties were obtained from these higher functionality thiol–ene systems that were toughened by commercial hyperbranched acrylates. DOI : 10.1007/s11998-010-9241-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9241-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9914
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 603-613[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012448 - Périodique Bibliothèque principale Documentaires Disponible Sucrose octaesters as reactive diluents for alkyd coatings / Andriy Popadyuk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
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Titre : Sucrose octaesters as reactive diluents for alkyd coatings Type de document : texte imprimé Auteurs : Andriy Popadyuk, Auteur ; Austin Breuer, Auteur ; James Bahr, Auteur ; Ihor Tarnavchyk, Auteur ; Andriy Voronov, Auteur ; Bret J. Chisholm, Auteur Année de publication : 2018 Article en page(s) : p. 481-488 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diluants
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Polyalkydes
RevêtementsTags : 'Diluant réactif' 'Revêtement alkyde' 'Sucrose polyester' de soja' 'Ester d'acide gras saccharose' 'Haute teneur en solides' Index. décimale : 667.9 Revêtements et enduits Résumé : Sucrose octasoyate (SS8) was investigated as a reactive diluent for a medium oil alkyd (MOA). SS8, which is derived from sugar and soybean oil, is 100% biobased, nontoxic, and biodegradable. As a result of its unique molecular architecture, it was expected that SS8 would be an excellent reactive diluent for alkyd coatings. The experiment conducted basically involved the incremental replacement of the MOA with SS8, while maintaining essentially equivalent solution viscosity. The properties of cured coatings were determined using industry standard methods. In general, it was found that SS8 could be used to reduce volatile organic compound content of the coatings, while also reducing drying time (i.e., tack-free time), increasing solvent resistance, and increasing impact resistance. Of the properties measured, the only cured film property that was negatively affected by the use of SS8 was the König pendulum hardness. However, the reduction in König pendulum hardness was only observed when the amount of MOA replaced by SS8 was greater than 10 wt%. Overall, these initial results suggest that SS8 is a very good reactive diluent for alkyd coatings. Note de contenu : - Fig. 1 : The chemical structure of a number of molecules that have been described in the literature as potential reactive diluents for alkyd coating
- Fig. 2 : representative chemical structure of an SS8 molecule. It should be understood that the chemical structure of the soy-based fatty acid ester molecules around a single sucrose core will vary and the distribution will depend on the fatty acid ester profile of the soybean oil used as a starting material
- Fig. 3 : Tack-free time as a function of SS8 content in the coating. Tack-free time was determined according to ASTM D1640
- Fig. 4 : Pendulum hardness as a function of SS8 content for the MOA/SS8 coatings
- Fig. 5 : The variation in solvent resistance with SS8 content for the MOA/SS8 coatings
- Fig. 6 : Direct impact resistance as a function of SS8 content for the MOA/SS8 coatings
- Fig. 7 : The variation in reverse impact resistance with SS8 content for the MOA/SS8 coatings
- Fig. 8 : relative comparison of the properties of coatings 90/10 MOA/SS8 and 75/25 MOA/SS8 to coating 100/0 MOA/ SS8. The spider chart shown in this figure was constructed such that the data point farthest from the center along any given axis is given a value of 1.0 and corresponds to the coating that had the most desired value for that property. For example, coating 75/25 MOA/SS8 exhibited the highest
solvent resistance, highest direct impact resistance, highest reverse impact resistance, lowest VOC content, and shortest drying time (i.e., tack-free time). As a result, a value of 1.0 was assigned to each of these properties for coating 75/25 MOA/SS8. However, for pendulum hardness, coating 100/0 MOA/SS8 exhibited the highest pendulum hardness, and, thus, a value of 1.0 was assigned to this coating on the hardness axis. The other two data points on each axis represent the magnitude of the property for the other two coatings as a fraction relative to the coating with the most desirable value for the property
- Table 1 : A description of the raw materials used for the study
- Table 2 : Compositions of the coating solutions produced
- Table 3 : The coating properties measured and the ASTM methods used to test them
- Table 4 : The solids and VOC content of the coating solutions produced and the biobased content of the cured films derived from the coating solutions
- Table 5 : Drying/curing characteristics of the coatings as determined using ASTM D1640DOI : 10.1007/s11998-017-0016-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0016-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30744
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 481-488[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible