Effects of TEMPO-mediated Oxidation of Pulp Fibers on Filtration and Ion-exchange Properties of Handsheets

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  • Ishizuka Masanori
    Technical Division, Yamashin Filter Corp.
  • Saito Tsuguyuki
    Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Enomae Toshiharu
    Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Isogai Akira
    Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo

Bibliographic Information

Other Title
  • パルプ繊維のTEMPO触媒酸化がシートの粒子捕捉特性あるいはイオン交換特性に与える影響
  • パルプ センイ ノ TEMPO ショクバイ サンカ ガ シート ノ リュウシ ホソク トクセイ アルイワ イオン コウカン トクセイ ニ アタエル エイキョウ ガン エイゴブン

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Abstract

First, highly fibrillated TEMPO-oxidized hardwood bleached kraft pulp (FTO-HBKP) was prepared by disintegration of TEMPO-oxidized HBKP (carboxylate content of ca. 1.5 mmol⁄g) in de-ionized water. The translucent FTO-HBKP dispersion thus obtained was added to the original unbeaten HBKP suspension in tap water to prepare HBKP⁄FTO-HBKP handsheets. The addition levels of FTO-HBKP to HBKP were set to be 0-30% based on dry weight of HBKP. The HBKP⁄FTO-HBKP sheet density was linearly increased as the addition level of FTO-HBKP was increased from 10 to 30%, and correspondingly the peak position of micro-pore size of the sheets was shifted to smaller range direction. Although air permeability of the sheets was decreased with the addition of FTO-HBKP, the sheets prepared even with 30% FTO-HBKP had still sufficient air permeability for filter materials. Filtration efficiency of nano⁄micron-size particles for the sheets in air was clearly improved by the FTO-HBKP addition, showing that the HBKP⁄FTO-HBKP sheets have potential applications as high-performance air-filters. Second, a TEMPO-oxidized softwood bleached kraft pulp (TO-SBKP : carboxylate content of ca. 1.2 mmol⁄g) was prepared from unbeaten SBKP, and handsheets were prepared thereof using either de-ionized water or tap water with 0-30% (based on dry weight of TO-SBKP) aluminum sulfate. Ion-exchange behavior of sodium carboxylate groups in TO-SBKP was then evaluated. When the TO-SBKP sheets were prepared in de-ionized water with aluminum sulfate, Na content originally present in the TO-SBKP sheet was decreased with the increase in the aluminum sulfate addition by ion-exchange. When tap water was used, Ca and Mg ions present in the tap water were first introduced to the TO-SBKP sheets by ion-exchange. Al content was increased with the aluminum sulfate addition by ion-exchange. Once-dried TO-SBHKP sheets also had similar ion-exchange capability from Na to Al, when the sheets were soaked in tap water or de-ionized water with aluminum sulfate.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 64 (8), 955-968, 2010

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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