Buscar

 

RI UFLA (Universidade Federal de Lavras) >
Revistas UFLA >
CERNE >

Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/14950

Title: CHEMICAL PROPERTIES OF TANNIC EXTRACTS FROM BARK OF Pinus oocarpa AND THEIR USE AS ADHESIVE
???metadata.dc.creator???: Vieira, Michel Cardoso
Lelis, Roberto Carlos Costa
Rodrigues, Nayara Dorigon
Keywords: Extract, polyphenol, tannin
Publisher: CERNE
CERNE
???metadata.dc.date???: 6-Apr-2016
Other Identifiers: http://www.cerne.ufla.br/site/index.php/CERNE/article/view/958
Description: This work evaluated the properties of aqueous extracts obtained from the bark of Pinus oocarpa under addition of sodium sulfite and sodium bisulfite and the possibility of employment of tannins from the bark as an adhesive for bonding wood. After evaluation of the chemical properties of tannic extracts it was decided to employ the extraction with distilled water under addition of / 5% sodium sulfite to prepare for the tannin-formaldehyde adhesive. Adhesive phenol formaldehyde and urea-formaldehyde were modified with 10% tannin Pinus oocarpa and the effect of this addition on the quality of the adhesive was evaluated. The addition from the bark of Pinus oocarpa showed that it is possible to use pure tannin as an adhesive because of its good gluing characteristics. The addition of tannic extract to synthetic adhesives contributed to increase viscosity values. Thus the substitution of synthetic adhesives by tannins is possible only up to 10%. 
???metadata.dc.language???: eng
Appears in Collections:CERNE

Files in This Item:

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


View Statistics

 


DSpace Software Copyright © 2002-2010  Duraspace - Feedback