Fine Fibrous Cellulose Composition for Transparent Low-Color Sheets
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Solution Overview
Problem
Existing methods for producing fine fibrous cellulose result in reduced transparency and coloring due to the removal of functional groups, and the adhesion between fibrous cellulose and resin layers is not optimal in composite laminates.
Innovation Solution
Fine fibrous cellulose with a fiber width of 1 to 10 nm and a substituent amount less than 0.5 mmol/g, along with a laminated sheet structure, enhances transparency and suppresses coloring, and includes a resin layer for improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical treatment is performed to introduce ionic functional groups for easy fibrillation, then fibrillation ease is improved, but transparency deteriorates due to substituent accumulation
Solution Approach 1:
The patent controls the substituent amount to less than 0.5 mmol/g by adjusting chemical treatment parameters (catalyst amount, reaction time, temperature), achieving a balance between fibrillation ease and transparency. This parameter optimization resolves the contradiction by finding the optimal substituent level that provides sufficient fibrillation facilitation without excessive substituent accumulation that would reduce transparency.
2Stability of the object's composition
If substituent amount is increased to enhance dispersion stability, then dispersion stability is improved, but transparency deteriorates
Solution Approach 1:
The patent identifies the optimal substituent amount range (less than 0.5 mmol/g) that provides adequate dispersion stability through electrostatic repulsion while preventing excessive substituent accumulation that would cause yellowing and reduce transparency. This parameter optimization resolves the contradiction between dispersion stability and transparency.
3Manufacturing precision
If defibration treatment energy is increased to obtain fine fibrous cellulose, then fibrillation completeness is improved, but energy consumption increases
Solution Approach 1:
The patent performs preliminary chemical treatment to introduce ionic functional groups before defibration treatment. This preliminary action facilitates easier fibrillation by reducing inter-fiber hydrogen bonding, allowing achieving fine fibrous cellulose (1-10 nm diameter) with lower defibration energy input, thus resolving the contradiction between fibrillation completeness and energy consumption.
4Strength
If resin layer is added to improve adhesion, then adhesion is improved, but transparency deteriorates due to resin interference
Solution Approach 1:
The patent applies resin locally only where adhesion is needed (at the interface between fibrous cellulose sheets) rather than throughout the entire structure. This localized resin application provides necessary adhesion while minimizing resin interference with light transmission through the bulk transparent fibrous cellulose layers, resolving the contradiction between adhesion and transparency.
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 solution achieves high transparency and suppressed coloring in fibrous cellulose solutions and sheets, and enhances adhesion in laminated structures, suitable for optical members and various applications.
Implementation Method 1
the amount of substituent introduced is less than 0.5 mmol/g and having a fiber width of 1 to 10 nm... enhances transparency and suppresses coloring
Data Source
AI summary
It is an object of the present invention to provide fine fibrous cellulose capable of enhancing transparency and suppressing coloring, when the fine fibrous cellulose are processed into a dispersed solution or a sheet. The present invention relates to fine fibrous cellulose, in which the amount of substituents introduced is less than 0.5 mmol/g and the fiber width is 1 to 10 nm. Moreover, the present invention relates to a dispersed solution and a sheet, each of which comprises fine fibrous cellulose. Furthermore, the present invention relates to a method for producing fine fibrous cellulose, comprising: (A) removing at least a part of substituents from fine fibrous cellulose with a fiber width of 1000 nm or less having the substituents, and (B) performing a uniform dispersion treatment on the resulting fine fibrous cellulose after completion of the (A).