Addition of Reed-Derived Cellulose Nanofibers to Change Handsheet Properties

Abstract

Reed pulp fiber is one of the main pulp fiber and has been used for a long time in China. The length of the fiber is 1.12 mm corresponding to a hardwood pulp fiber [1-3]. Therefore, in China, the reed pulp fiber is using for packaging paper, book paper and sanitary paper widely, in particular, printing paper. In addition, most softwood and hardwood wood pulps are used as raw materials [4, 5], and research on cellulose nanofiber (CNF) from non-wood pulp is still limited. Furthermore, in the future, an eco-process to produce CNF will need more and more. Therefore, we focus on the CNF from the reed pulp fiber by Aqueous counter collision (ACC) treatment using only water without chemical agent [6]. The cellulose framework in plant cell walls consists of crystalline nanofibers 4‒15 nm wide, with a strength reaching 10 times that of steel despite having a mass one-fifth that of steel [7‒9]. CNF is expected to be widely used as a composite material, an absorbent material, and a biopharmaceutical material due to its high strength, high specific surface area, high biocompatibility, and biodegradability. For these reasons it is being widely studied [10‒12]. Chemical and mechanical treatment of natural pulp fibers yield CNFs defibrillated to a width of 4 to 100 nm [13]. TEMPO catalyzed oxidation by a 2,2,6,6tetramethylpiperidine-1-oxyl catalyst [14, 15] is commonly carried out. Mechanical processing includes grinding [16], mechanical high-pressure homogenization [17], high-speed collision treatment [18], high-intensity ultrasonic treatment [19], and ACC treatment [6]. While various preparation methods for CNF have been developed, none have a clear advantage in terms of conditions, equipment investment, or running costs, nor in terms of minimizing damage to cellulose type I and nano-fibers [20]. The ACC method is considered to be useful because it does not destroy the molecular structure of cellulose [21, 22]. The ACC method is a method for refining CNF by colliding natural fiber dispersions at high speed. This is also known as a wet method, and CNF is prepared as a dispersion of several wt% [23, 24]. Not only the development of new applications of CNF as high-performance materials is expected, but the use of CNF in pulp and paper production is also important. Currently, it is expected to be applied to 【Transaction】