Cationic Microfibrillated Plant Fiber for Uniform Nanofibrillation

The patent applies cationic modification to the cellulose fibers before defibration treatment. This preliminary chemical treatment introduces positive charges on the fiber surface, which prevents fiber aggregation during subsequent mechanical processing and ensures uniform dispersibility. The cationic groups are grafted onto the fiber surface in advance, creating a stable foundation for achieving consistent nanofibrillation and uniform fiber properties in the final product, thereby resolving the contradiction between refinement uniformity and strength consistency.

The patent carefully controls the degree of cationic substitution and the density of cationic groups on the fiber surface. By optimizing these parameters, the invention achieves a balance where sufficient cationic charges are present to provide strong electrostatic bonding between fibers (improving strength), while the modification does not create excessive fiber aggregation that would hinder dispersibility. The controlled parameter adjustment ensures both improved fiber bonding and maintained ease of handling.

The patent employs cationic modification with controlled degree of substitution to improve water retentivity. The cationic groups introduced through this treatment enhance the fiber's ability to retain water by creating hydrophilic sites on the fiber surface. By carefully controlling the modification parameters (amount of cationic agent, reaction conditions), the invention achieves improved water retentivity while minimizing excessive surface damage and maintaining fiber property consistency, avoiding the pitfalls of extensive chemical treatment.