Uncaria gambier tannin adhesives for exterior grade plywood / Smita Mathur in PAINTINDIA, Vol. LVII, N° 6 (06/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 6 (06/2007) . - p. 93-100 Titre : Uncaria gambier tannin adhesives for exterior grade plywood Type de document : texte imprimé Auteurs : Smita Mathur, Auteur ; Pradeep Sharma, Auteur ; K. S. Shukla, Auteur ; P. L. Soni, Auteur Année de publication : 2007 Article en page(s) : p. 93-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colles:Adhésifs Contreplaqué Copolymérisation Formaldéhyde Gambier Phénol Tanins Index. décimale : 667.9 Revêtements et enduits Résumé : Resins were prepared from phenol formaldehyde and Uncaria gambier tannin by copolymerization at 100°C. Tannin was used to substitute phenol upto 50% using 5, 8 and 11% alkali concentrations. Adhesive formulations and gluing conditions were examined by preparing laboratory 3-ply sal (Shorea robusta) boards (53.34cm x 53.34cm). In order to study the effect of alkali concentration and molar ratio of phenol with tannin, the gluing results obtained were analyzed and it was revealed that the glue shear strength of the plywood can meet the requirements of the Indian Standards IS: 303-1989, for exterior grade plywood. Hence Uncaria gambier tannin would be a desirable substitute for phenol as a low cost material and the studied tannin based adhesive is suitable for industrial application. Note de contenu : - Experimental - Materials and methods - Testing - Results and discussion - Tannin – phenol – formaldehyde adhesives - Glue shear strength - Tannin – phenol – formaldehyde resin Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11479 [article]

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Use of fortified urea formaldehyde adhesives in moisture resistance grade plywood / Smita Mathur in PAINTINDIA, Vol. LVII, N° 9 (09/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 9 (09/2007) . - p. 97-105 Titre : Use of fortified urea formaldehyde adhesives in moisture resistance grade plywood Type de document : texte imprimé Auteurs : Smita Mathur, Auteur ; Pradeep Sharma, Auteur ; K. S. Shukla, Auteur ; P. L. Soni, Auteur Année de publication : 2007 Article en page(s) : p. 97-105 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Resins were prepared by fortifying urea formaldehyde with tannins of Uncaria gambier and Acacia catechu separately upto 30% at room temperature. Adhesive formulations and gluing conditions were examined by preparing laboratory 3-ply sal boards (53.34cm x 53.34cm). In order to study the effect of fortification of Urea formaldehyde with both the tannins, the gluing results obtained were analyzed and it was revealed that the glue shear strength of the plywood cannot only meet the requirements of the Indian Standards IS: 303-1989, for moisture resistance grade plywood, but also better than control. Hence both the tannins would be desirable fortifiers for urea formaldehyde resin as reducing the cost of the glue without affecting the bond quality of Moisture Resistance (MR) grade plywood. Note de contenu : Experimental : Preparation of urea-formaldehyde (UF) resin Basic adhesive formulation and gluing conditions Basic gluing conditions - Results and discussion : Urea-tannin-formaldehyde (UTF) resins - Glue shear strength - Statistical analysis Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11506 [article]

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