Cellulose Fiber Dispersion Using Ionic Liquid Swelling Media
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Solution Overview
Problem
Current processes for finely dispersing cellulose fibers require functionalization, such as TEMPO oxidation, which alters the cellulose structure and limits the stability and versatility of the dispersions.
Innovation Solution
Dispersing cellulose fibers in a mixture of an ionic liquid and a protic antisolvent, such as 1,1,3,3-tetramethylguanidium acetate monohydrate and water, allows for stable dispersions without functionalization, maintaining the cellulose's structure and enabling mechanical defibration for improved dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If functionalization (e.g., TEMPO oxidation) is used to disperse cellulose fibers, then dispersion capability is improved, but cellulose structure is altered and stability is reduced
Solution Approach 1:
The invention changes the physical-chemical parameters of the dispersion medium by using an ionic liquid instead of conventional solvents. The ionic liquid's unique properties (high ionic conductivity, low volatility, tunable viscosity) enable effective fiber dispersion without requiring chemical functionalization of cellulose, thus maintaining structural stability while improving dispersion capability
Solution Approach 2:
The ionic liquid acts as an intermediary substance between cellulose fibers and the dispersion medium. It facilitates fiber separation and dispersion through its ability to interact with cellulose surface groups, enabling effective dispersion without permanently altering the cellulose structure through functionalization reactions
2Manufacturing precision
If mechanical treatment (defibration) is applied to improve dispersion, then fiber distribution is improved, but energy consumption increases
Solution Approach 1:
The ionic liquid is applied to cellulose fibers before mechanical defibration to swell and separate the fibers preliminarily. This pre-treatment reduces fiber-fiber bonding strength, allowing subsequent mechanical treatment to achieve better distribution uniformity with lower energy input compared to treating dry, unbonded fibers
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 produces stable cellulose fiber dispersions that remain undissolved, with low viscosity and minimal degradation, enabling new applications and uses, including as additives in fibrous products and coatings, while maintaining cellulose I crystallinity.
Implementation Method 1
The ionic liquid is preferably being selected from the group of protic salts of organic superbases capable of dissolving cellulose
Implementation Method 2
a mixture of an ionic liquid and a protic antisolvent for cellulose at a ratio at which the mixture of the ionic liquid and the antisolvent will be capable of primarily achieving swelling of cellulose rather than dissolution of it
Data Source
AI summary
A dispersion of cellulose fibers, a method of preparing the same and uses thereof. The dispersion is produced by providing a cellulose feedstock comprising cellulose fibers; by providing a mixture of an ionic liquid and a protic antisolvent for cellulose as a dispersion medium, the ionic liquid being selected from the group of protic salts of superbases capable of dissolving cellulose; and by mixing said cellulose feedstock into said dispersion medium so as to disperse the cellulose fibers therein to form a dispersion which is stable for at least 24 hours at room temperature. The dispersion can be used as an additive of cellulose pulps for making of fibrous products.