Laundry Detergent Surfactant System for Hydrophobic Dye Stability
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Solution Overview
Problem
Hydrophobic dyes used in laundry liquid formulations tend to precipitate over time, especially in the presence of surfactants, leading to reduced solubility and effectiveness in maintaining the perception of whiteness in textiles.
Innovation Solution
An aqueous laundry liquid detergent formulation with a specific ratio of linear alkyl benzene sulphonate, alkyl sulphate, and non-ionic surfactants, along with hydrophobic dyes, is developed to maintain the solubility of dyes from production to use, using a combination of surfactants like LAS, alkyl ethoxylated sulphates, and non-ionic surfactants, which effectively prevents dye precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hydrophobic dyes are used to shade synthetic garments, then the perception of whiteness is improved, but the dyes precipitate from solution over time
Solution Approach 1:
The patent introduces specific surfactants (non-ionic surfactants, alkyl benzene sulphonates, and alkyl sulphates) as intermediary substances that mediate between the hydrophobic dye molecules and the aqueous detergent formulation. These surfactants form mixed micelles that solubilize the hydrophobic dyes, preventing precipitation while maintaining the shading effect that provides whiteness perception.
Solution Approach 2:
The patent creates a composite solubilization system by combining multiple surfactant types (non-ionic surfactants with alkyl benzene sulphonates and alkyl sulphates) in specific ratios. This composite surfactant system provides synergistic effects that enhance dye solubility and stability more effectively than single surfactant systems, maintaining both whiteness perception and compositional stability.
2Quantity of substance
If surfactants are added to solubilise hydrophobic dyes, then the solubility is improved, but the dyes still precipitate with time
Solution Approach 1:
The patent optimizes specific parameters including the ratios of different surfactants (non-ionic:alkyl benzene sulphonate:alkyl sulphate in ranges of 1:1.5 to 2.5:1.5 to 2.5), the concentration of dyes (0.0005-0.003 wt%), and the chain lengths of alkyl groups. These parameter optimizations ensure long-term solubility stability by creating a balanced micellar system that prevents dye precipitation over time.
Solution Approach 2:
The patent performs preliminary solubilization of hydrophobic dyes in the detergent formulation during manufacturing, creating pre-stabilized mixed micelles before the product reaches the consumer. This preliminary action ensures that the dyes remain solubilized throughout storage and use, preventing precipitation that would otherwise occur with time.
3Quantity of substance
If long alkyl chains are used to solubilise dyes, then the solubility is improved, but the formulation complexity increases
Solution Approach 1:
The patent segments the solubilization function across three distinct surfactant components rather than relying on a single complex surfactant with long alkyl chains. Each surfactant type (non-ionic, alkyl benzene sulphonate, alkyl sulphate) contributes specific properties, and their combination achieves superior solubilization while maintaining formulation simplicity and flexibility.
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 formulation effectively maintains the solubility of hydrophobic dyes, ensuring the perception of whiteness in textiles over time, with improved stability and performance in domestic washing conditions.
Implementation Method 1
the formulation contains a hydrotrope to solubilise the dye
Implementation Method 2
Additionally the formulation contains a hydrotrope to solubilise the dye
Data Source
AI summary
The present invention provides a liquid laundry liquid detergent formulation comprising a dye that reduces precipitation of the dye.