CNSL-derived polymers for use in surface coatings / K. S. Shukla in PAINTINDIA, Vol. LII, N° 2 (02/2002)

[article]  inPAINTINDIA > Vol. LII, N° 2 (02/2002) . - p. 29-32 Titre : CNSL-derived polymers for use in surface coatings Type de document : texte imprimé Auteurs : K. S. Shukla, Auteur ; S. Prasad, Auteur ; Pramod Kumar, Auteur ; Deepak Srivastava, Auteur Année de publication : 2002 Article en page(s) : p. 29-32 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Cashew Nut Shell Liquid (CNSL), a by-product of the cashew industry, is one of the potential natural sources of phenols/monomers for the synthesis of a variety resins/polymers for use in surface coatings. CNSL, a dark-coloured product, is obtained from the shell of cashew nut. Cashew tree, Anacardium Accidentale Linn, of Brazil origin, is now being grown extensively in India also. In the present paper, extraction and refining of CNSL has been briefly outlined to get a technically useful product. The chemistry of CNSL and its components has been discussed along with the polymerization of CNSL. Possible modifications of CNSL have been considered to yield useful film-formers for surface coatings of improved technical utility. CNSL-aldehyde resins have been found to be superior to ordinary phenol-aldehyde resins when used in surface coatings, and as insulating materials. The important polymeric materials which have been developed by using CNSL as one of the constituents or a modifier, such as CNSL-aldehyde condensation products, CNSL-modified phenolic resins, polyesters, epoxies and polyurethanes, have been elaborated. Both solvent-borne and waterborne coating formulations have been discussed. Water-dispersible and water-soluble resins with their preparation and properties have been covered in this paper with the purpose to draw guidelines for the designing of ecofriendly polymeric film-formers for surface coatings. Note de contenu : - Extraction of CNSL - Refining - Chemistry of CNSL and its components - Polymerization of CNSL - CNSL-aldehyde condensation products - Epoxy resins - Miscellaneous coating materials - Water-borne coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12302 [article]

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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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