Surface Sizing Inducing Microscopic Phase Separation

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  • ミクロな相分離構造を形成する表面処方
  • ミクロナ ソウ ブンリ コウゾウ オ ケイセイスル ヒョウメン ショホウ

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Abstract

Recently, neutral papermaking and increase in the usage of recycled pulp containing calcium carbonates have been proceeding in Japan. Accordingly, dosages of alum are decreased and its activities as cationic sites are also reduced, especially in a higher pH range. And larger amounts of fillers such as calcium carbonate are filled in neutral papers. Under these circumstances, conventional surface sizing agents do not work well, because of the sizing mechanism by electrostatic interaction arising from ionicity.<BR>Thus, we have developed a novel surface sizing system, which is less affected by changes in papermaking pH and filler contents in paper. This surface sizing system consists of newly developed polymer based anionic surface sizing agent (SS) along with modified polyacrylamide based surface strength agent (surface PAM) , and shows excellent sizing performance with minor effect of calcium carbonate contents in paper, even for the no alum system.<BR>In order to understand the surface sizing mechanism of the novel system above, we carried out model experiment with use of the cast-coated and spin-coated films of surface PAM and SS, and SS only. Optical microscope and atomic force microscope (AFM) analyses on the films revealed that the films of surface PAM and SS have micro⁄nano-scale irregular surface structures like sea-island morphology due to phase separation. And they also showed higher contact angles than the film of SS only. Thus, it is suggested that microscopic phase separation may induce the surface sizing performance.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 62 (8), 961-967, 2008

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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