Method for decolorizing polyester fabric and polyester fabric
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Solution Overview
Problem
Current methods for decolorizing polyester fabric, such as chemical oxidation-reduction, do not effectively remove dyes, leading to residual dye issues that cause thermal decomposition and degrade the fabric's physical properties.
Innovation Solution
A two-stage immersion process using specific solutions: the first solution contains water, a first swelling agent, and a solubility promoter to improve dye solubility, while the second solution includes water, a second swelling agent, and an auxiliary swelling agent to further dissolve dyes in the non-crystalline region of the polyester.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical oxidation-reduction decolorization is used, then the decolorization process can be performed, but the dye is not effectively removed and residual dye causes thermal decomposition and deteriorates fabric properties
Solution Approach 1:
The patent changes the chemical parameters of the treatment solution by using a specific combination of swelling agents (such as formic acid, phenol) and solubility promoters (such as tetrabutylammonium bromide) to alter the solubility characteristics of dyes in the treatment medium, enabling effective dye removal without residual harmful effects
Solution Approach 2:
The patent introduces swelling agents as intermediary substances that facilitate the penetration and extraction of dyes from polyester fabric. These swelling agents act as mediators between the treatment solution and the dye molecules, enabling effective decolorization while preventing thermal decomposition
2Device complexity
If conventional decolorization methods are used, then the process is simple, but the dye removal is incomplete and fabric purity decreases
Solution Approach 1:
The patent employs a composite treatment solution containing multiple components including swelling agents (formic acid, phenol), solubility promoters (tetrabutylammonium bromide), and other auxiliary substances. This composite formulation achieves complete dye removal while maintaining fabric purity, overcoming the limitations of simple conventional methods
3Adaptability or versatility
If polyester fabric is to be recycled effectively, then a feasible recycling mechanism is needed, but current methods lack effectiveness for PET fabric recycling
Solution Approach 1:
The patent modifies the chemical parameters of the treatment environment using specific swelling agents and solubility promoters to create optimal conditions for dye extraction from polyester fabric, enabling reliable and effective recycling of PET fabrics that was not achievable with conventional methods
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 achieves deep decolorization of polyester fabric, significantly improving the reusability of polyester fabrics by effectively removing dyes without using pressurized equipment, and reducing environmental impact.
Implementation Method 1
The first solution includes water, a first swelling agent, and a solubility promoter... the first swelling agent may be C1-C6 aliphatic carboxylic acid, C7-C13 aromatic carboxylic acid, alkali metal hydroxide, alkaline earth metal hydroxide... the solubility promoter may be R14NCl, peroxide, persulfate, cerium salt, chlorine-containing inorganic acid, chlorine-containing inorganic salt
Implementation Method 2
The second solution includes water, a second swelling agent and an auxiliary swelling agent... the second swelling agent may be C3-C8 aliphatic alcohol, C4-C8 aliphatic ketone, C8-C16 aromatic ketone, C6-C10 phenolic compound... the auxiliary swelling agent may be ethylene carbonate, propylene carbonate, dimethyl acetamide, dimethyl formamide, dimethyl sulfoxide, ethyl acetate, tetrahydrofuran, dihydrolevoglucosenone
Data Source
AI summary
A method for decolorizing polyester fabric and a polyester fabric are provided. The method for decolorizing polyester fabric includes providing a dye-attached polyester fabric. The dye-attached polyester fabric is immersed in a first solution, obtaining a treated polyester fabric. The treated polyester fabric is immersed in a second solution, to obtain a decolorized polyester fabric. The first solution includes water, a first swelling agent and a solubility promoter. The second solution includes water, a second swelling agent, and an auxiliary swelling agent.