Cellulose Molding Conditions for Low-Crystalline Transparent Bodies
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Solution Overview
Problem
Existing cellulose manufacturing methods, such as the viscose method, involve numerous steps, require extensive equipment, generate hazardous gases, and pose environmental and safety challenges, and struggle to produce cellulose molded bodies with controlled crystallinity and xylose concentration.
Innovation Solution
A manufacturing method that dissolves cellulose in a cellulose-dissolving agent comprising tetraalkylammonium acetate and an aprotic polar solvent, discharges the solution into an aqueous molding solution, and dries the wet molded body to produce a cellulose molded body with controlled crystallinity, allowing for forms like fibrous, film, or spherical shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the viscose method is used to manufacture cellulose, then cellulose can be produced, but the process involves many steps, requires extensive equipment, generates sulfurizing gases, and poses environmental and safety challenges
Solution Approach 1:
The invention extracts and eliminates the complex viscose generation steps from the cellulose manufacturing process. By using a direct dissolution method with ionic liquid and aprotic polar solvent, the process removes the intermediate viscose formation stage, thereby simplifying equipment requirements and eliminating sulfurizing gas generation while maintaining reliable cellulose production
Solution Approach 2:
The invention introduces ionic liquid and aprotic polar solvent as intermediary substances to directly dissolve cellulose without requiring viscose formation. This intermediary dissolution approach replaces the traditional alkali-cellulose-sulfurization pathway, eliminating harmful gases and reducing equipment complexity while ensuring production reliability
2Reliability
If the viscose method is used to manufacture cellulose, then cellulose can be produced, but the use of alkali solutions, acid solutions, and hydrogen sulfide gives rise to environmental impact issues
Solution Approach 1:
The invention converts the harmful chemical pathway into a beneficial green chemistry approach by replacing alkali solutions, acid solutions, and hydrogen sulfide with ionic liquid and aprotic polar solvent. This substitution eliminates waste liquid treatment requirements and exhaust gas processing while maintaining effective cellulose dissolution and production reliability
Solution Approach 2:
The invention creates an inert and environmentally benign processing environment by using ionic liquid and aprotic polar solvent instead of reactive alkali and acid solutions. This inert chemical environment eliminates the generation of harmful waste streams and reduces environmental impact while ensuring reliable cellulose manufacturing
3Strength
If high crystallinity cellulose is used, then strength is improved, but transparency and flexibility decrease
Solution Approach 1:
The invention changes the crystallinity parameter of cellulose by controlling the dissolution and regeneration conditions using ionic liquid and aprotic polar solvent. By adjusting dissolution temperature, solvent composition, and regeneration rate, the process produces cellulose with optimized low crystallinity that simultaneously achieves adequate strength, high transparency, and good flexibility
Solution Approach 2:
The invention creates a composite structure in the regenerated cellulose by controlling the molecular arrangement during dissolution and regeneration. The process produces a composite morphology with optimized crystalline and amorphous regions that balances mechanical strength with optical transparency and flexibility
4Shape
If high xylose concentration pulp is used to obtain low crystalline cellulose fiber, then transparency and flexibility are improved, but dyeability decreases and safety standards may not be satisfied
Solution Approach 1:
The invention changes multiple parameters simultaneously including xylose concentration (0.1-20%), dissolution temperature (40-90°C), and solvent composition ratios to achieve the optimal balance. By controlling these parameters during direct dissolution, the process produces cellulose with low crystallinity for transparency and flexibility while maintaining adequate dyeability and meeting safety standards
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 enables the production of low-crystalline cellulose molded bodies with improved transparency, flexibility, and dyeability, using a wide range of raw materials, reducing environmental impact and safety hazards, and facilitating easy manufacturing and processing.
Implementation Method 1
a cellulose material is dissolved with a mixed solvent comprising an ionic liquid of imidazolium salt and an aprotic polar solvent to form a cellulose solution
Implementation Method 2
the cellulose solution undergoes coagulation with an acid solution such as sulfuric acid
Implementation Method 3
the wet molded body is dried to obtain a cellulose molded body
Data Source
AI summary
Provided are a manufacturing method for a cellulose molded body, in which a low-crystalline cellulose molded body can be obtained by adjusting the molding conditions regardless of xylose concentration in constituent sugars of the cellulose material, and a cellulose molded body. Included are a cellulose dissolution step of dissolving a cellulose material in a cellulose-dissolving agent to obtain a cellulose solution; a molding step of discharging the cellulose solution into an aqueous molding solution at 10 to 70°C comprising 20 to 50% of the cellulose-dissolving agent to produce a wet molded body; and a drying step of washing and then drying the wet molded body to obtain a cellulose molded body.