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Cellulose

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Improvement of wet paper strength using a phosphoric acid–urea solution

  • Yoshihito Yamamoto
  • Hideaki IchiuraEmail author
  • Yoshito Ohtani
Original Research
  • 19 Downloads

Abstract

We investigated treatment of cellulose paper with a phosphoric acid–urea solution for increasing the wet strength. First, a filter paper was immersed in a phosphoric acid–urea solution (phosphoric acid: urea mole ratio = 1:0, 3:1, 1:1, or 1:3). Next, the filter paper was put between glass plates and heated at 80–140 °C for 15 min to 3 h. Then, the filter paper was washed for 1 h in distilled water. After washing, the filter paper was dried in a hot press at 110 °C and 1.1 MPa for 1 h. We investigated disintegration by immersing the prepared filter papers in distilled water. The paper treated with the 1:3 phosphoric acid–urea solution did not disintegrate. The optimum concentrations for developing the wet strength of the paper were 1.2–2.5 M phosphoric acid and 3.7–7.5 M urea. The optimum treatment time and temperature were 1.5 h and 140 °C, respectively. The wet strength of the paper increased after treatment with the phosphoric acid–urea solution. This method is a viable alternative to treatment with chemicals such as polyamidoamine epichlorohydrin.

Keywords

Paper strength Wet strength Phosphoric acid Urea Phosphoric acid esterification 

Notes

Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research (C) (Grant No. 16K07810) from the Japan Society for the Promotion of Science (JSPS). We thank Gabrielle David, Ph.D., from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

Supplementary material

10570_2019_2423_MOESM1_ESM.pptx (3.9 mb)
Supplementary material 1 (PPTX 4040 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Yoshihito Yamamoto
    • 1
  • Hideaki Ichiura
    • 1
    Email author
  • Yoshito Ohtani
    • 1
  1. 1.Faculty of Agriculture and Marine ScienceKochi UniversityNankokuJapan

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