Cationic Microfibrillated Plant Fiber for Consistent Nano Defibration
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Solution Overview
Problem
Existing methods for manufacturing microfibrillated plant fibers result in varying fiber dispersibility and surface damage, leading to inconsistent properties in sheets and resin composites due to differences in defibration and chemical treatment methods, which affect the strength and performance of the final products.
Innovation Solution
A method involving the cationic modification of cellulose fibers using a quaternary-ammonium-group-containing cationization agent followed by mechanical defibration in water to produce microfibrillated plant fibers with enhanced strength and uniform properties, achieving an average diameter of 4 to 200 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If mechanical defibration methods are used to produce microfibrillated plant fibers, then fiber diameter is reduced to nano-order, but fiber dispersibility and surface quality vary significantly leading to inconsistent product properties
Solution Approach 1:
The patent applies cationic modification to the plant fiber before mechanical defibration. This preliminary chemical treatment introduces cationic groups that enhance fiber surface properties and control inter-fiber interactions, leading to more consistent dispersibility and surface quality after mechanical processing, while achieving the desired nano-order fiber diameter.
2Strength
If chemical treatment is applied to improve water retentivity, then fiber bonding is enhanced, but fiber surface damage and property inconsistency increase
Solution Approach 1:
The patent utilizes cationic modification to change the chemical parameters of the fiber surface by introducing cationic groups. This chemical parameter change enhances fiber bonding strength and water retentivity through electrostatic interactions, while the controlled nature of this chemical treatment minimizes surface damage compared to aggressive mechanical or chemical processes.
3Length of moving object
If extensive mechanical processing is used to achieve fine microfibrillation, then fiber diameter is reduced, but fiber strength and surface integrity deteriorate
Solution Approach 1:
The patent performs cationic modification before mechanical defibration to strengthen the fiber structure in advance. The introduced cationic groups create electrostatic interactions that reinforce fiber integrity during the subsequent mechanical processing, allowing achievement of nano-order fiber diameter while maintaining fiber strength and surface integrity.
4Adaptability or versatility
If different defibration methods are employed, then production flexibility is maintained, but product property consistency decreases
Solution Approach 1:
The patent introduces cationic modification as a controlling parameter that standardizes fiber properties regardless of the specific mechanical defibration method used. This chemical treatment creates a consistent baseline of fiber surface characteristics and inter-fiber interactions, ensuring product property consistency even when different defibration methods or equipment are employed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the production of microfibrillated plant fibers with significantly high strength, suitable for a wide range of applications including interior materials, structural components, and electronic devices, by improving fiber bonding through electrostatic interactions and optimizing the defibration process.
Implementation Method 1
reacting hydroxyl groups in a material containing a cellulose fiber with a quaternary-ammonium-group-containing cationization agent to cationically modify the material containing a cellulose fiber
Implementation Method 2
by merely subjecting plant fiber to cationic modification, bonding between fibers is enhanced by electrostatic interaction
Implementation Method 3
microfibrillation can significantly proceed by applying mechanical shear stress to a plant fiber that has been cationically modified
Data Source
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AI summary
The present invention provides a novel cationized microfibrillated plant fiber and a method for manufacturing the same. A cationic microfibrillated plant fiber that is cationically modified with a quaternary-ammonium-group-containing compound, and that has an average diameter of 4 to 200 nm.