Partially Cationic Polymer for Textile Dye Fixation
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Solution Overview
Problem
Conventional dye fixers used in laundry processes have adverse environmental profiles due to high molecular weight and cationic charge, leading to ineffective dye fixation, especially with direct dyes on fabrics, and result in significant dye loss during washing.
Innovation Solution
Partially cationically substituted quaternary ammonium polymers, with a lower cationic charge, are used in fabric conditioners to improve dye fixation by depositing on fabrics during the rinse cycle, reducing dye loss in subsequent washes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dye fixers with high cationic charge are used, then dye fixation effectiveness is improved, but environmental profile becomes unacceptable
Solution Approach 1:
The patent changes the cationic charge parameter from high (conventional) to low (novel), specifically using polymers with less than 1 mmol/g cationic charge. This parameter change resolves the contradiction by demonstrating that effective dye fixation can be achieved with lower cationic charge, thereby improving environmental profile while maintaining reliability
Solution Approach 2:
The patent applies local quality by using partially cationically substituted polymers where only specific portions of the polymer chain carry cationic charges. This creates a non-uniform distribution of cationic groups, allowing the polymer to interact effectively with anionic dyes while maintaining overall lower cationic charge density and reduced environmental harm
2Object-affected harmful factors
If polymer cationic charge is reduced to improve environmental profile, then dye fixation effectiveness deteriorates
Solution Approach 1:
The patent employs composite materials by combining polymer chains with partially cationic substitution, creating a material that has both cationic regions (for dye interaction) and non-cationic regions (for reduced environmental impact). This composite structure allows the polymer to maintain dye fixation effectiveness while achieving lower overall cationic charge
Solution Approach 2:
The patent applies segmentation by dividing the polymer structure into cationic segments (quaternary ammonium groups) and non-cationic segments (hydrocarbon chains). This segmentation allows the cationic portions to provide necessary dye fixation functionality while the overall segmented structure maintains lower average cationic charge, resolving the effectiveness-environmental profile contradiction
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 these polymers significantly reduces dye fading and loss, particularly for direct dyes on cotton fabrics, providing a more sustainable and effective dye fixation solution.
Implementation Method 1
The anionic surfactant and cationic polymer interact to form a lubricating layer on the fabric
Implementation Method 2
these cationic polymer/anionic surfactant compositions are said to lubricate the fibres of textile articles, thus resulting in reduced wear, pilling and color fading
Data Source
AI summary
Use of a cationic polymer in the treatment of textiles to improve dye fixation in textiles, characterised in that the cationic polymer is a linear cationically substituted quaternary ammonium salt according to the following Formula (I): wherein, x is from 0 to 3 and the ratio of y:n is in the range of from 0.01 - 0.5 (i.e. n:y is from 100 to 2), provided that y ? n.