Film characteristics of novolac based epoxy ester films - I / Madhu Bajpai in PAINTINDIA, Vol. XLVI, N° 5 (05/1996)

[article]  inPAINTINDIA > Vol. XLVI, N° 5 (05/1996) . - p. 27-32 Titre : Film characteristics of novolac based epoxy ester films - I Titre original : Nigerseed oil epoxy esters Type de document : texte imprimé Auteurs : Madhu Bajpai, Auteur ; Arti Sharma, Auteur Année de publication : 1996 Article en page(s) : p. 27-32 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Liant  'Epoxyde  résine'  Novolaque  'Corps  gras  végétal'  Préparation  'Propriété  physique'  chimique'  Feuil  'Résistance  eau'  base'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy esters were prepared from nigerseed oil fatty and novolac based epoxy resins. the novolac used for preparing the epoxy resins were prepared using different proportions of phenol and formaldehyde. The film characteristics of novolac based epoxy esters of different oil length were studied and comparison was made with the film characteristics of epoxy esters prepared from bisphenol-A based epoxy resin. It was observed that all the films had dried within 24 hours and were tack-free the desired film forming characteristics. All the epoxy ester films passed the flexibility test on 1/4 inch mandrel. The scratch hardness of the films decreased with the increasing oil length irrespective of the phenolic source of the epoxy resin. The water resistance and alkali resistance of the epoxy ester films showed a definite pattern vis a vis the epoxy esters prepared from novolac and bisphenol-A. While the water resistance of the epoxy esters improved with the increasing oil length of the esters, yhe alkali resistance decreased with the increasing oil length. Both alkali resistance and water resistance improved with the higher proportion of formaldehyde in the novolac used as starting a material for the preparation of epoxy ester. Both the alkali and water resistance of the novolac based epoxy esters were superior to the epoxy esters based on bisphenol-A. All the epoxy ester films showed very goog acid-resistance. Note de contenu : - Experimental : Preparation of novolac resins - Preparation of epoxy resins - Preparation of epoxy esters - Preparation of coatings - Evaluation of film characteristics - Results and Discussion : Drying time - Scratch hardness - Flexibility - Water rsistance - Alkali resistance - Acid resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13483 [article]

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Film characteristics of novolac based epoxy ester films-II / Madhu Bajpai in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 53-58 Titre : Film characteristics of novolac based epoxy ester films-II Type de document : texte imprimé Auteurs : Madhu Bajpai, Auteur ; Arti Sharma, Auteur Année de publication : 1997 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture  Liant  'Epoxyde  résine'  Novolaque  'Ester  polymère'  'Corps  gras  végétal'  'Nicotiana  tabacum'  'Propriété  physique'  chimique'  mécanique'  Feuil  Solanaceae  Dicotyledones  Angiospermae  Spermatophyta Index. décimale : 667.9 Revêtements et enduits Résumé : Tobacco seed oil fatty acids were used to esterify novolac based epoxy resins. The novolac epoxy resins werepreparedby using three different ratios ofphenol to formaldehyde. The films of prepared epoxy esters with different oil lengths, were evaluated for various performance tests and were compared with those of bisphenol-A based epoxy resin. All the films dried faster and took a maximum of 13 hrs to dry tack free. Epoxy esters prepared from novolac epoxy resins having higher phenol to formaldehyde ratios showed better scratch hardness than those with lower ratios. Also, epoxy esters with shortest oil length possessed best scratch hardness. All the films were highly flexible. The studies showed that alkali resistance of epoxy esters is slightly better than water resistance. The water resistance increased with the increase in the oil length and also with increase in the phenol to formaldehyde ratio in novolac epoxy resins. In the case of alkali resistance, it increased with the increase in phenol - formaldehyde ratio and it decreased with the increase in oil length. The acid resistance of all the samples were excellent. Note de contenu : - EXPERIMENTAL - Preparation of novolac resins - Preparation of epoxy resins - Preparation of epoxy esters - Preparation of coating samples - Evaluation of film characteristics - RESULTS AND DISCUSSION - Drying time - Scratch hardness - Flexibility - Water resistance - Alkali resistance - Acid resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13312 [article]

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