Supercritical Fluid Dyeing Using Dye Transfer Between Materials
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Solution Overview
Problem
Traditional dyeing processes using water face challenges such as environmental impact and inefficiencies in the interaction of dyes with supercritical fluids, particularly in terms of solubility, introduction, dispersion, and characterization, which hinder industrial-scale implementation.
Innovation Solution
A method utilizing a supercritical fluid, like carbon dioxide, to transfer dye from a first material to a second material within a common vessel, where the dye is integral to the first material, allowing for efficient dyeing by changing the dye profile of the second material through perfusion with SCF CO2, which can be in contact or separate from the first material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a separate preparation vessel is used to introduce dye to supercritical fluid before transferring to textile treatment system, then the solubility and dispersion of dye in supercritical fluid is improved, but the device complexity and process complexity increases
Solution Approach 1:
The patent combines the dye introduction function directly into the textile treatment system, eliminating the separate preparation vessel. The dye is introduced into the supercritical fluid within the treatment chamber itself, merging two previously separate operations into one integrated system, thereby reducing device complexity while maintaining dye solubility and dispersion effectiveness
Solution Approach 2:
The patent extracts the unnecessary intermediate preparation step from the overall process. By removing the separate preparation vessel and directly introducing dye into the supercritical fluid within the treatment system, the process is simplified while the essential function of dye solubilization and dispersion is preserved through direct introduction methods
2Ease of manufacture
If traditional water-based dyeing is used, then the dyeing process is simple and well-established, but environmental harm and water consumption increase significantly
Solution Approach 1:
The patent changes the physical state and chemical composition of the dyeing medium from liquid water to supercritical carbon dioxide. This parameter change fundamentally alters the environmental properties of the process - supercritical CO2 is non-toxic, non-flammable, and can be easily separated from the dyed material by pressure reduction, eliminating wastewater discharge and residual chemical contamination while maintaining effective dyeing capability
Solution Approach 2:
The patent converts the potential harm of using alternative solvents into a benefit by selecting supercritical CO2, which has advantageous properties: it is environmentally benign, readily available, inexpensive, and its supercritical state provides excellent solvent properties for dyes. The high pressure required to achieve supercritical state, which might be seen as a disadvantage, actually enhances dye penetration and solubility, turning a potential drawback into a performance advantage
3Productivity
If dye is introduced into vessel containing material to be dyed in conjunction with supercritical fluid, then the process complexity increases, but the dyeing efficiency and uniformity is improved
Solution Approach 1:
The patent applies preliminary action by pre-dissolving the dye in the supercritical fluid before it contacts the textile material. This ensures uniform dye distribution in the supercritical medium, which then penetrates the fabric evenly, improving dyeing uniformity and efficiency while the integrated system design keeps process complexity manageable
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 approach enables faster and more efficient dyeing with reduced environmental impact by using SCF CO2 to dissolve and transport dye, achieving desired dye profiles on materials like fabrics and yarns, while minimizing waste and process complexity.
Implementation Method 1
A dye-free supercritical fluid is passed through a first material in a pressurized vessel. The supercritical fluid transports dye from the first material to at least a second material
Implementation Method 2
The supercritical fluid transports dye from the first material to at least a second material causing a dye profile of the second material to change as the dye perfuse the second material
Implementation Method 3
causing a dye profile of the second material to change as the dye perfuse the second material
Data Source
AI summary
Methods are directed to the use of a supercritical fluid for performing a dyeing of a material such that dye from a first material is used to dye a second material. A supercritical fluid is passed through a first material in a pressurized vessel. The supercritical fluid transports the dye from the first material to at least a second material causing a dye profile of the second material to change as a result of dye from the first material perfusing the second material.