| 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 : |
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in PAINTINDIA > Vol. XLVII, N° 8 (08/1997) . - p. 53-58
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Film characteristics of novolac based epoxy ester films-II in PAINTINDIA, Vol. XLVII, N° 8 (08/1997)
