Banca de DEFESA: JALTIERY BEZERRA DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JALTIERY BEZERRA DE SOUZA
DATA : 27/02/2019
HORA: 08:30
LOCAL: RNP - Centro de Convivência (Campus Central)
TÍTULO:

POTENTIAL FOR THE USE OF TANANS OF Acacia mangium IN THE PRODUCTION OF ADHESIVE FOR WOOD COLLAGE

PALAVRAS-CHAVES:

Collage of wood; exotic species; production of tannins.

PÁGINAS: 68
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Tecnologia e Utilização de Produtos Florestais
ESPECIALIDADE: Anatomia e Identificação de Produtos Florestais
RESUMO:

In order to be successful in the process of wood bonding it is necessary to study and know the characteristics of each adhesive used, aiming at its better use, increasing the quality of the piece and reducing costs. The aim of this work was to quantify the amount of tannic substances present in the bark of Acacia Mangium Willd due to the influence of the soil preparation and the collection period (dry and rainy), as well as to test its efficiency in the production of wood adhesives. The collections were in the experimental experimental area of the Agricultural School of Jundiaí, Macaíba, Rio Grande do Norte, in the months of June of 2017 and January of 2018, respectively rainy and dry period. Eight individuals were slaughtered in the rainy season and four in the dry season to collect their bark. The husks were removed from the stem and twigs, ground in a knife mill, sorted into sieves and used for the extraction of tannins, particles smaller than 1.0 x 2.0 cm and greater than 0.2 x 0.2 cm (aperture of the sieves). The tannins for the production of adhesives were extracted in distilled water, placed in a stainless steel container, placed in an autoclave at the boiling temperature of the water at atmospheric pressure, after extraction were concentrated by evaporation in a greenhouse and kept at a temperature of 35 ° C. ± 45 ° C until complete evaporation and becoming an anhydrous material. The content of total solids, Stiasny index and condensed tannin content of A. mangium bark collected in both periods (dry and rainy) were evaluated. The adhesives were produced in the Laboratory of Anatomy of the Wood and Wood Panels of the Federal University of Lavras (UFLA), Lavras - MG, after this stage were made panels of Pinus sp. with dimensions of 30 x 30 cm, consisting of five slides of Pinus sp. and adhesives of A. mangium tannin, A. mearnsi tannin and Phenol-formaldehyde to evaluate the quality of the adhesives and subsequently the physical test of water absorption and the mechanical shear and janka hardness. It is concluded that the tannin content of the bark of the Acacia mangium species from the city of Macaíba / RN in the Northeast Region of Brazil was not affected by the treatment of the soil received and that it can be classified as a tannin producer in the rainy season. be used as a wood adhesive.

MEMBROS DA BANCA:
Presidente - 2326526 - TATIANE KELLY BARBOSA DE AZEVEDO CARNAVAL
Interno - 1079298 - ALEXANDRE SANTOS PIMENTA
Externa ao Programa - 1841666 - ERMELINDA MARIA MOTA OLIVEIRA
Externa à Instituição - THAÍS BRITO SOUSA - UFLA