Reactive Dye Laundry Composition Hue Brightness Control
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Solution Overview
Problem
Laundry detergent compositions that use hueing dyes tend to accumulate on fabrics, leading to undesirable discoloration and a trade-off between hue benefit and tint accumulation, while reactive dyes pose irritation and sensitization concerns, making them less practical for use in laundry detergents.
Innovation Solution
A laundry detergent composition containing 0.00001% to 0.01% by weight of a reactive dye, which provides a brighter hue to fabrics without excessive buildup, using a combination of reactive dyes like Reactive Blue 268 and Reactive Red 238, and a surfactant blend, applied at a temperature below 40°C and pH of 9-10, to achieve balanced hue and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional hueing dyes (acid dye, basic dye, or direct dye) are used in laundry detergent composition, then a favorable hue can be imparted to fabrics, but the dye accumulates on fabrics after repeated laundering, causing undesirable discoloration and tint buildup
Solution Approach 1:
The patent changes the chemical parameters of the dye by using reactive dyes with specific functional groups (halo-triazine, vinyl sulfone, isocyanate, epoxy, or carboxylic acid groups) that provide different binding characteristics compared to traditional dyes. This parameter change allows the dye to impart hue while reducing accumulation through controlled reactivity and solubility properties
Solution Approach 2:
The patent employs composite dye formulations combining multiple reactive dyes with different functional groups and chromophores (azo, anthraquinone, xanthene, triphenodioxazine). This composite approach creates a synergistic effect that optimizes both hue imparting capability and resistance to accumulation on fabrics
2Quantity of substance
If reactive dyes are used in laundry detergent composition, then hue benefit and reduced accumulation can be achieved, but the functional groups in reactive dyes can cause irritation and sensitization of respiratory tract and skin
Solution Approach 1:
The patent carefully controls the concentration of reactive dye at very low levels (0.00001% to 0.01% by weight) and adjusts pH parameters (maintaining pH 7-11, preferably pH 8-10) to minimize the reactivity of the functional groups. This parameter optimization reduces the potential for irritation and sensitization while maintaining the desired hue imparting and accumulation control benefits
3Object-affected harmful factors
If hydrolysed reactive dyes are used instead of reactive dyes, then irritation and sensitization issues can be reduced, but the cost increases due to additional hydrolysation process and quality control complexity
Solution Approach 1:
The patent uses a partial hydrolysis approach where the reactive dye is pre-treated to reduce the reactivity of some functional groups, but not completely hydrolyzed. This partial action maintains manufacturing simplicity while sufficiently reducing irritation and sensitization risks, avoiding the need for complete hydrolysis and its associated complexity and cost
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 detergent composition imparts a desirable shade to fabrics in fewer wash cycles with reduced dye accumulation, offering improved tinting efficiency and safety compared to traditional dyes.
Implementation Method 1
reactive dyes have been used in the textile manufacturing industry for coloring textiles by covalent bonding to the fabric under conditions like high pH, high temperature and/or high dye concentration
Implementation Method 2
the reactive group on the reactive dye provides an increased solubility to the dye, helping balancing hue benefit and dye accumulation while the hydrolyzation of the reactive group gives a different behavior to the dye
Implementation Method 3
The laundry detergent composition contains from about 3% to about 50% by weight of a surfactant and from about 0.00001% to about 0.01% by weight of a reactive dye
Data Source
AI summary
Laundry detergent compositions comprising 0.00001% to 0.01% by weight of reactive dyes are disclosed. The laundry detergent compositions provide the benefit of imparting a favorable shade to fabrics without undesirable buildup of dyes on the fabrics.