Shading Dye with Polyalkoxy Groups for Textile Whiteness
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Solution Overview
Problem
Existing laundry detergents struggle to maintain the whiteness of textiles over time due to fading or yellowing, and existing shading dyes face challenges in deposition on cellulosic and synthetic fibers, particularly in domestic laundry settings, with issues of precipitation in liquid detergents and dissolution in powder forms.
Innovation Solution
A laundry detergent composition containing a shading dye covalently bound to alkoxy-CH2CHO or -CH2CHO capped polyalkoxy groups, which enhances deposition on both cellulosic and synthetic fibers, reduces precipitation in liquids, and improves dispersion in powders, with the -CH2CHO moiety promoting oxidation and adherence to textiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shading dyes are used, then deposition on textiles occurs, but deposition is uneven between cellulosic and synthetic fibers
Solution Approach 1:
The patent modifies the chemical parameters of the shading dye by introducing specific functional groups (carboxylic acid groups and polyalkoxylated chains) to alter its interaction properties with different fiber types. This enables the dye to achieve balanced deposition on both cellulosic and synthetic fibers through changed chemical characteristics rather than physical formulation adjustments.
Solution Approach 2:
The shading dye is designed as a composite molecular structure combining multiple functional groups (chromophore, carboxylic acid groups, and polyalkoxylated chains) within a single molecule. This composite structure allows the dye to simultaneously interact with different fiber types through different functional groups, achieving versatile and uniform deposition across diverse textile materials.
2Reliability
If shading dye is added to liquid detergent, then whiteness maintenance is improved, but precipitation occurs during storage
Solution Approach 1:
The patent changes the chemical parameters of the shading dye by incorporating polyalkoxylated chains with specific molecular weights and carboxylic acid groups. These parameter changes improve the dye's solubility and compatibility with liquid detergent formulations, preventing precipitation during storage while maintaining its effectiveness for whiteness maintenance.
Solution Approach 2:
The carboxylic acid groups and polyalkoxylated chains act as intermediaries between the shading dye and the liquid detergent formulation. These intermediary functional groups improve compatibility and prevent direct interaction between the dye and other detergent components that would cause precipitation, thereby stabilizing the formulation during storage.
3Reliability
If shading dye is added to powder detergent, then whiteness maintenance is improved, but dissolution efficiency is reduced
Solution Approach 1:
The patent modifies the physical and chemical parameters of the shading dye by introducing polyalkoxylated chains with specific hydrophilic-lipophilic balance. These parameter changes enhance the dye's dissolution characteristics in powder detergent systems, allowing efficient dissolution during the wash cycle while maintaining effective deposition on textiles.
4Quantity of substance
If low amounts of shading dye are used, then aesthetic value is maintained, but deposition effectiveness is reduced
Solution Approach 1:
The patent changes the chemical parameters of the shading dye to enhance its affinity for textile fibers through specific functional groups. This increased affinity allows effective deposition at low concentrations, maintaining aesthetic value while achieving sufficient deposition effectiveness with minimal dye quantity.
Solution Approach 2:
The patent applies local quality by concentrating the dyeing action at the fiber-dye interface through enhanced molecular affinity. The functional groups localize the interaction at the fiber surface, ensuring effective deposition even when the overall dye concentration in the formulation is low, thereby maintaining aesthetic value without requiring high dye quantities.
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 solution ensures balanced deposition on various fibers, increases the longevity of the shading effect, and reduces wash-off resistance, maintaining textile whiteness and aesthetic value.
Implementation Method 1
once deposited onto textiles during a domestic laundry method and exposed to fresh air during wear, the shading dyes according to the invention are believed to oxidize at least in part to promote cation interaction thereby improve adherence to the textile
Implementation Method 2
this is believed due to the -CH 2 CHO moiety providing improved dispersion properties
Data Source
AI summary
A laundry detergent composition comprising: (i) from 2 to 70 wt. % of a surfactant; and (ii) from 0.00001 to 0.1 wt. % of shading dye which is covalently bound to at least one alkoxy-CH2CHO or -CH2CHO capped polyalkoxy group.