Preparation of pulp treated with ionic liquid and its application to environmental-friendly papermaking chemicals

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K06167
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 40020:Wood science-related
• Research Institution: Kochi University
• Principal Investigator: Ichiura Hideaki 高知大学, 教育研究部自然科学系農学部門, 教授 (30448394)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: イオン液体 / 紙 / 製紙薬剤 / 湿潤紙力 / 乾燥紙力

Outline of Final Research Achievements

In this study, the function of paper containing pulp treated with 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as ionic liquid was investigated. The powdered pulp impregnated with [BMIM]Cl at 80℃or 25℃for 0-5 day or 0-2 h was stirred after the addition of 10 mL distilled water. Next, the paper was prepared using the mixture of the treated pulp and LBKP (1:1). The dry and wet strength of the paper were evaluated. The dry and wet strength of the paper were improved by the addition of the pulp treated with [BMIM]Cl. This result was caused by the increasing of inter-fiber hydrogen bonding due to the film-formed pulp.
The paper strength tended to decrease when the recovered ionic liquids with heat treatment were used. Therefore, in the case of paper with pulp treated with recovered ionic liquids, which was used for the treatment at 25℃ without heat treatment, the reduction of drying and wet paper strength could be suppressed.

Free Research Field

紙パルプ

Academic Significance and Societal Importance of the Research Achievements

本研究では、イオン液体を活用して、一部フィルム化したパルプを内添用製紙薬剤として使用を試みた。これは、白水の水質改善が可能である点に加え、従来の石油系の製紙薬剤を使用しない環境調和性の高い乾燥・湿潤紙力剤の調製が可能になる。本研究は、セルロースのみからなる新しい内添用湿潤紙力剤に関する研究であり、現在の製紙工業が抱える環境問題を解決する有望な手段と考えられる。