Solvent-Spun Cellulosic Mouldings High Working Capacity
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Solution Overview
Problem
Existing cellulosic moldings with high tensile strength have low elongation values, limiting their expansion reserves, which is undesirable for technical applications requiring both high strength and sufficient expansion capabilities.
Innovation Solution
Solvent-spun cellulosic shaped bodies with a maximum tensile force of at least 30 cN/tex, characterized by a working capacity calculated as the product of maximum tensile force and elongation, achieving values of at least 80 J/g, preferably 82 J/g, and most preferably 90 J/g, while maintaining high tensile strength and elongation at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high tensile strength is achieved in cellulosic moldings, then strength increases, but elongation decreases
Solution Approach 1:
The patent applies parameter changes by systematically optimizing multiple processing parameters including solvent composition (ionic liquid type and concentration), spinning conditions (temperature, pressure, flow rate), coagulation bath composition, and drying parameters. This comprehensive parameter optimization enables simultaneous achievement of high tensile strength (≥30 cN/tex) and high elongation (≥10%), resolving the traditional trade-off between these properties.
Solution Approach 2:
The patent employs composite material strategies by using ionic liquids as solvents combined with specific cellulose sources, and by optimizing the interaction between solvent and coagulation bath compositions. This composite approach creates a synergistic effect that enhances both strength and elongation properties beyond what can be achieved with conventional single-parameter optimization.
2Strength
If high tensile strength is achieved in cellulosic moldings, then maximum tensile force increases, but working capacity decreases due to low elongation
Solution Approach 1:
The patent resolves this contradiction through comprehensive parameter optimization that simultaneously enhances both maximum tensile force and elongation. By optimizing ionic liquid composition, spinning parameters, and coagulation conditions, the patent achieves working capacity values of at least 80 J/g (preferably at least 82 J/g, more preferably at least 85J/g and most preferably at least 90J/g), proving that high strength and high energy absorption capacity can coexist.
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
Simultaneously achieving very high tensile strength and high elongation at break, a combination not previously disclosed in the prior art, making them suitable for technical applications such as yarns, tire cords, and textile reinforcing fabrics.
Implementation Method 1
cellulose is dissolved, the solution is formed into fibers or films/membranes
Implementation Method 2
the cellulose is regenerated by precipitation in aqueous solutions
Data Source
AI summary
Solvent-spun cellulosic mouldings from a solution predominantly containing cellulose in a solvent are proposed, characterized in that the cellulosic mouldings have a working capacity, determined from the mathematical product of ultimate tensile strength and ultimate tensile elongation, of at least 80 J/g.