Purified Polysaccharide Fiber Production via Ionic Liquid Spinning
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Solution Overview
Problem
Current methods for producing polysaccharide fibers, such as wet-spinning or dry-wet-spinning, often result in a skin-core structure with low strength and poor tire characteristics due to differences in fiber structure, and the recycling rate of ionic liquids affects productivity, while also generating environmental concerns like carbon disulfide emission.
Innovation Solution
A production method involving polysaccharide solutions dissolved in ionic liquids with specific cationic and anionic moieties, where the concentration of ionic liquids in solidification baths is controlled, and multiple baths are used to gradually lower ionic liquid concentration, ensuring high recycling rates and avoiding carbon disulfide emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wet-spinning or dry-wet-spinning is used to produce polysaccharide fibers, then the fibers can be manufactured, but a skin-core structure forms with low strength and poor tire characteristics
Solution Approach 1:
The patent changes the chemical composition parameters of the spinning solution by incorporating specific ionic liquids with defined cationic and anionic moieties. This parameter change modifies the dissolution and regeneration behavior of polysaccharides, eliminating the skin-core structure and producing uniform high-strength fibers suitable for tire applications.
2Ease of manufacture
If carbon disulfide is used to dissolve cellulose for rayon production, then cellulose can be melted and dissolved, but high environmental load is generated
Solution Approach 1:
The patent replaces the toxic carbon disulfide solvent with ionic liquids that can be recycled and reused. This substitution eliminates the environmental harm associated with carbon disulfide emission while maintaining the ability to dissolve and process cellulose and other polysaccharides effectively.
Solution Approach 2:
The patent uses ionic liquids as environmentally benign solvents that create a safe processing environment without the harmful emissions associated with traditional carbon disulfide-based systems. The ionic liquids provide an inert, non-volatile medium for polysaccharide processing.
3Strength
If dissolving pulp with 98% cellulose purity is used, then high strength fibers can be obtained, but hemicellulose components are removed reducing resource efficiency
Solution Approach 1:
The patent changes the processing parameters by using ionic liquids that enable selective dissolution and regeneration. This allows hemicellulose to be retained in the fiber structure at controlled levels (0.1-40% by weight) while maintaining high fiber strength, thereby improving resource efficiency without sacrificing mechanical properties.
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
This method produces polysaccharide fibers with enhanced strength and improved tire characteristics, reduces environmental impact by minimizing carbon disulfide emission, and increases resource usage efficiency by incorporating hemicellulose, leading to higher productivity and better fiber quality.
Implementation Method 1
it is necessary to break intramolecular and intermolecular hydrogen bonds of three hydroxyl groups present in one repeating unit of cellulose
Implementation Method 2
several types of the ionic liquids which efficiently dissolve the cellulose raw material have been reported
Implementation Method 3
the polysaccharide is solidified from the outside of the fiber (filament), and thus, in a case of viewing the fiber from the cross-sectional direction
Data Source
AI summary
The present invention provides a production method for purified polysaccharide fibers in which carbon disulfide emission is suppressed while efficiently producing purified polysaccharide fibers having excellent strength, purified polysaccharide fibers produced by using the production method, a fiber-rubber complex using the purified polysaccharide fibers, and a tire having excellent tire characteristics using the fiber-rubber complex. The production method for purified polysaccharide fibers of the present invention is a production method for purified polysaccharide fibers of wet-spinning or dry-wet-spinning polysaccharide by bringing a polysaccharide solution obtained by dissolving a polysaccharide raw material in a liquid including an ionic liquid into contact with a solidification liquid including an ionic liquid, in which a concentration of the ionic liquid in the solidification liquid is 0.4% by weight to 50% by weight and the anionic moieties of the ionic liquid in the polysaccharide solution and the ionic liquid in the solidification liquid have one or more types selected from the group consisting of a phosphinate ion, a phosphate ion, and a phosphonate ion.