Protection of the color of textile fibers by means of cationic polysacchrides
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Solution Overview
Problem
Dyed textile fibers experience significant color loss during washing and rinsing cycles due to the desorption of pigments into the aqueous medium, leading to fading and potential color transfer between fabrics.
Innovation Solution
Incorporating a cationic polysaccharide into laundry products, which retains pigments on the fibers by reducing their desorption during washing, thereby preventing color loss and transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional laundry products are used for washing dyed textile fibers, then effective cleaning is achieved, but color loss and fading occur due to pigment desorption
Solution Approach 1:
The patent introduces a cationic polymer as an intermediary substance that mediates between the laundry product and the dyed fibers. The cationic polymer binds to the negatively charged pigment molecules through electrostatic attraction, forming a protective complex that prevents pigment desorption during washing, thereby reducing color loss while maintaining cleaning effectiveness
Solution Approach 2:
The patent changes the chemical parameter of the laundry formulation by incorporating cationic polymers with specific charge densities and molecular weights. This parameter change enables the laundry product to maintain its cleaning function while simultaneously providing color protection through electrostatic interactions with pigment molecules
2Ease of operation
If washing cycles are performed to clean textile articles, then hygiene and freshness are improved, but color transfer between fabrics occurs due to pigment entrainment in water
Solution Approach 1:
The cationic polymer acts as a mediator that intercepts pigment molecules in the washing water before they can transfer between fabrics. By binding to pigments through electrostatic attraction, the polymer prevents pigment migration and color transfer while allowing the washing cycle to proceed effectively
Solution Approach 2:
The patent converts the harmful effect of pigment mobility in water (which causes color transfer) into a beneficial effect by utilizing the electrostatic attraction between cationic polymers and anionic pigments. This transformation causes pigments to be selectively bound and retained rather than transferred, turning potential harm into color protection
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
The use of cationic polysaccharides effectively inhibits color fading and transfer, maintaining the color integrity of dyed fibers, particularly those using common textile dyes like Sulphur Black and Reactive Red, by ensuring the pigments remain bound to the fibers during washing.
Implementation Method 1
the cationic polysaccharides retain in the textile fibers all or some of the dyes or pigments which, in the absence of the cationic polysaccharides, have a tendency to be desorbed during the treatment with the laundry product
Data Source
AI summary
The present invention relates to the use of a cationic polysaccharide in a detergent composition used for treating dyed textile fibers in an aqueous medium, in order to reduce the loss of color of the dyed fibers when treating same using said detergent composition.