Ionic Liquid Fiber Welding to Preserve Natural Fiber Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing composite materials from natural fibers are limited by the need for full dissolution of biopolymers, which disrupts the original structure and properties, and are not scalable for commercial production, whereas fiber welding preserves the fiber interior structure but lacks processes for commercial-scale production.
Innovation Solution
A method for producing welded substrates using ionic liquid-based solvents that partially dissolve natural fibers, allowing for the manipulation and fusion of fibers into desired shapes without full denaturation, incorporating a process solvent application, temperature/pressure control, and solvent recovery to create robust composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If full dissolution of biopolymers is used to produce composite materials, then the materials can be easily processed and formed into desired shapes, but the original fiber structure and material properties are disrupted and lost
Solution Approach 1:
The patent applies partial dissolution by using ionic liquid solvents that selectively dissolve only the matrix material between fibers while leaving the fiber interiors intact. This partial action achieves sufficient processability for shaping without completely disrupting the fiber structure, thus resolving the contradiction between ease of manufacture and composition stability
Solution Approach 2:
The invention creates local quality differences by treating different regions of the composite differently - the matrix regions are dissolved and reformed to enable shaping, while the fiber core regions are preserved to maintain structural integrity and material properties. This localized approach allows simultaneous achievement of processability and structure retention
2Productivity
If traditional solution-based methods are used to create composite materials, then continuous production is possible, but the solutions are viscous and difficult to handle, limiting scalability
Solution Approach 1:
The patent introduces ionic liquid solvents as intermediaries that enable temporary dissolution and manipulation of the composite material during processing. These solvents act as mediators that allow the material to be shaped and formed, then are removed or recovered to leave the final product. This intermediary approach enables continuous production while avoiding the viscosity problems of traditional solutions
Solution Approach 2:
The invention changes key parameters including using ionic liquid solvents with favorable flow properties, controlling temperature and pressure conditions during processing, and adjusting solvent-to-material ratios. These parameter changes improve solution handling characteristics while maintaining continuous production capability, resolving the contradiction between productivity and ease of operation
3Strength
If fiber welding is used to preserve the native state of fiber interiors, then robust materials with retained properties are produced, but commercial-scale production processes are not established
Solution Approach 1:
The patent extracts or removes the matrix material using ionic liquid solvents, allowing the fiber bundles to be manipulated and reconfigured into desired shapes. This extraction process preserves the native fiber interiors while enabling commercial-scale processing through continuous operation. The removed matrix can be recovered and the process scaled, resolving the contradiction between strength and productivity
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 robust, scalable composite materials with enhanced physical and chemical properties, retaining the original material attributes of natural fibers and reducing the need for synthetic adhesives, thus offering a sustainable alternative to petroleum-based materials.
Implementation Method 1
Ionic liquids (e.g., I-ethyl-3-methylimidazolium acetate) can dissolve natural fiber biopolymers (e.g., cellulose and silk) without derivatization
Implementation Method 2
The substrate is passed through a process solvent application zone, a process temperature/pressure zone
Implementation Method 3
a process solvent recovery zone, wherein the welded substrate is passed from the process temperature/pressure zone to the process solvent recovery zone
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A welding process may be configured to convert a substrate into a welded substrate by applying a process solvent to the substrate, wherein the process solvent interrupts one or more intermolecular force between one or more component in the substrate. The substrate may be configured as a natural fiber, such as cellulose, hemicelluloses, and silk. The process solvent may be configured as an ionic-liquid based solvent and the welded substrate may be a congealed network after the process solvent has been adequately swollen and/or mobilized the substrate. A welding process may be configured such that individual fibers of a substrate are not fully dissolved such that material in the fiber core may be left in the native state by controlling process variables. The welding process fibers may have a tenacity 10% or 20% greater or a diameter 25% less than that of a cellulosic-based yam substrate.