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Authors
Abstract(s)
Neste trabalho de investigação pretendeu-se melhorar as propriedades de resistência
mecânica do papel reciclado, tendo como matéria-prima de partida, uma pasta kraft
branqueada de Eucalyptus globulus que foi submetida a 4 ciclos de reciclagem (R1, R2,
R3 e R4). Foram incorporados 3 aditivos, nomeadamente o amido catiónico (C Bond
35806 amostra industrial), o bórax e a carboximetilcelulose com o objetivo de aumentar
a resistência mecânica de forma a prolongar o número de ciclos de reciclagem. O trabalho
foi dividido em 3 fases, onde na primeira foi feito o estudo dos ciclos de reciclagem sem
incorporação de aditivos. Na fase 2, procedeu-se ao estudo da influência da incorporação
dos 3 aditivos nas propriedades da pasta virgem. Finalmente, na terceira fase,
incorporou-se o aditivo que apresentou os melhores resultados na fase anterior (amido
catiónico) nos ciclos de reciclagem R3 e R4. Neste estudo foi possível recuperar a
resistência mecânica das estruturas fibrosas nas reciclagens R3 e R4 em comparação com
a pasta de referência virgem, com a incorporação do aditivo amido catiónico a 3%. Estes
resultados permitem-nos concluir que é possível aumentar o número de ciclos de
reciclagem com a incorporação deste aditivo e sem prejudicar a propriedades das
estruturas fibrosas recicladas.
In this research work, the aim was to improve the mechanical resistance properties of recycled paper, using as starting raw material a bleached Eucalyptus globulus kraft pulp that was subjected to 4 recycling cycles (R1, R2, R3 and R4). Three additives were incorporated, namely cationic starch (C Bond 35806 industrial sample), borax and carboxymethylcellulose with the aim of increasing mechanical resistance in order to extend the number of recycling cycles. The work was divided into 3 phases, where the first involved studying recycling cycles without incorporating additives. In phase 2, the influence of the incorporation of the 3 additives on the properties of the virgin paste was studied. Finally, in the third phase, the additive that showed the best results in the previous phase (cationic starch) was incorporated into recycling cycles R3 and R4. In this study, it was possible to recover the mechanical resistance of the fibrous structures in recycling R3 and R4 in comparison with the virgin reference pulp, with the incorporation of the 3% cationic starch additive. These results allow us to conclude that it is possible to increase the number of recycling cycles with the incorporation of this additive and without damaging the properties of the recycled fibrous structures.
In this research work, the aim was to improve the mechanical resistance properties of recycled paper, using as starting raw material a bleached Eucalyptus globulus kraft pulp that was subjected to 4 recycling cycles (R1, R2, R3 and R4). Three additives were incorporated, namely cationic starch (C Bond 35806 industrial sample), borax and carboxymethylcellulose with the aim of increasing mechanical resistance in order to extend the number of recycling cycles. The work was divided into 3 phases, where the first involved studying recycling cycles without incorporating additives. In phase 2, the influence of the incorporation of the 3 additives on the properties of the virgin paste was studied. Finally, in the third phase, the additive that showed the best results in the previous phase (cationic starch) was incorporated into recycling cycles R3 and R4. In this study, it was possible to recover the mechanical resistance of the fibrous structures in recycling R3 and R4 in comparison with the virgin reference pulp, with the incorporation of the 3% cationic starch additive. These results allow us to conclude that it is possible to increase the number of recycling cycles with the incorporation of this additive and without damaging the properties of the recycled fibrous structures.
Description
Keywords
Amido Catiónico Bórax Carboximetilcelulose Estruturas Celulósicas Propriedades Mecânicas Reciclagem