Production of Micro- and Nanofibrillated Cellulose through an Aqueous Counter Collision System Followed by Ultrasound: Effect of Mechanical Pretreatments

ABSTRACT

The purpose of this work was the production of cellulose micro-nanofibrils from wood pulps through a combination of mechanical treatments, including a recently patented process, a so-called aqueous counter collision (ACC) method followed by ultrasound treatment. Previously to ACC process, the raw pulp materials had to be downscaled to micro-sized dimension, due to the limits of collision jets nozzle diameter. Therefore, the softwood and hardwood pulps were mechanically pre-treated with valley beater refining or dry ball milling. Optical microscopy, atomic force microscopy, X-ray diffraction, thermogravimetric analysis, and gravimetric yield were estimated, to evaluate the effect of mechanical pretreatments on the proposed integrated fibrillation process. The characterizations indicated that valley beater as mechanical pretreatment was found to be more efficient compared to ball milling, of producing cellulose micro-nanofibrils in compliance with the proposed experimental procedure.

摘要

这项工作的目的是通过组合机械处理从木浆生产纤维素微纳米纤维，包括最近专利的工艺，所谓的水相反碰撞（ACC）方法，然后是超声波处理.在水反碰撞工艺之前，由于碰撞射流喷嘴直径的限制，制浆原料必须缩小到微米尺寸.因此，针叶木和阔叶木浆用谷打浆机精炼或干球磨进行机械预处理.通过光学显微镜、原子力显微镜、X射线衍射、热重分析、重量收率等测试手段，评价了机械预处理对集成化纤颤过程的影响.结果表明，谷物打浆机作为机械预处理，与球磨相比，能更有效地制备纤维素微纳米纤维.

KEYWORDS:

• Cellulose nanofibrils
• mechanical defibrillation
• ACC
• valley beater
• ball milling

关键词:

• 纤维素纳米纤维
• 机械除颤
• 水反碰撞
• 打谷机
• 球磨

Acknowledgments

This research was supported by the creative research initiatives program through the National Research Foundation of Korea (NRF-2015R1A3A2066301).

Additional information

Funding

This work was supported by the National Research Foundation of Korea [NRF-2015R1A3A2066301];