Evaluation of Silica-Coated PCC as New Modified Filler for Papermaking

• Autor(a) principal: Lourenço, Ana F.
• Data de Publicação: 2013
• Outros Autores: Gamelas, José A. F., Zscherneck, Christin, Ferreira, Paulo J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/80186; https://doi.org/10.1021/ie3035477

Silica-coated precipitated calcium carbonate (PCC) prepared by a sol-gel method in a previous study, was used, for the first time, as filler for papermaking. Three samples of modified PCC, containing 11 wt%, 21 wt% and 29 wt% of silica, were prepared. The handsheets produced with an eucalyptus kraft pulp furnish containing the new PCC-based materials showed better paper strength properties than those with the unmodified PCC, whereas the structural properties and brightness were not affected (for similar filler retention values (ca. 80%)). The results suggest that a thin film of silica coating the calcium carbonate crystals has a positive impact on the filler-to-fiber-to-filler bonding. This may open a new possibility to increase the filler amount in the papermaking industry.