AKD sizing behavior of high-bulk papers prepared with fatty acid diamide salts

作者：Mukai Kenta; Enomae Toshiharu; Isogai Akira^*

来源：Nordic Pulp & Paper Research Journal, 2010, 25(4): 441-447.

• Bulking promoter
• De-bonder
• AKD
• Non-extractable AKD
• Sizing degree
• Sheet density

Two aqueous colloidal dispersions of de-bonders, di(oleamido)ammonium formic acid salt (DOFAS) and di(stearamido)ammonium formic acid salt (DSFAS), were used as wet-end additives in handsheet-making with or without alkylketene dimer (AKD). The influence of de-bonder addition on the handsheet properties was studied in terms of interactions between AKD and de-bonders in the handsheets. The AKD addition to pulp slurries had almost no influence on the de-bonder retention ratio or density of the handsheets. On the other hand, AKD retention and sizing behavior were clearly different between the DOFAS and DSFAS additions: AKD retention was clearly improved by the DOFAS addition, whereas no sizing features were observed. On the other hand, sizing degree was improved by the DSFAS addition, while AKD retention ratios were nearly unchanged. Because DOFAS has unsaturated aliphatic groups, the hydrophobic nature of AKD was compensated by the DOFAS addition, whereas DSFAS molecules did not interfere with the hydrophobic nature of AKD components in the handsheets. Thus, differences in the chemical structure between DOFAS and DSFAS, which have unsaturated and saturated aliphatic groups, respectively, are likely to have resulted in the different AKD sizing and retention behavior between them.

• 出版日期2010