Liquid Surfactant Stability via Diamide Nitrogen Substitution
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Solution Overview
Problem
Formulating stable liquid detergents with bleach is challenging due to sedimentation issues with dihydroxyterephthalic diamides, particularly in high surfactant content compositions, leading to inadequate removal of bleachable stains like those containing polyphenolic dyes.
Innovation Solution
Incorporating dihydroxyterephthalic acid diamides with special substitution on the amide nitrogen atom into liquid surfactant compositions, which improves stability and enhances washing performance for bleachable stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dihydroxyterephthalic acid diamides are incorporated into liquid surfactant compositions, then washing performance for bleachable stains is improved, but the composition stability deteriorates due to sedimentation
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of dihydroxyterephthalic acid diamides through specific substitution at the amide nitrogen atom. This structural parameter change prevents sedimentation while maintaining washing performance, resolving the contradiction between effectiveness and stability in liquid surfactant compositions.
Solution Approach 2:
The invention creates a composite system by combining modified dihydroxyterephthalic acid diamides with surfactants in specific concentrations (0.01-10% w/w). This composite approach ensures both the stability of the liquid composition and the effectiveness for removing bleachable stains, overcoming the sedimentation issue while maintaining washing performance.
2Productivity
If high surfactant content is used in liquid compositions, then cleaning effectiveness is improved, but sedimentation of dihydroxyterephthalic diamides worsens
Solution Approach 1:
By changing the molecular parameters of dihydroxyterephthalic acid diamides through nitrogen substitution, the patent enables the use of high surfactant content (20-70% w/w) without causing sedimentation. The modified diamides remain soluble and stable even in high surfactant concentrations, maintaining both cleaning effectiveness and composition stability.
3Stability of the object's composition
If bleach is omitted from liquid detergents, then formulation stability is improved, but removal of bleachable stains deteriorates
Solution Approach 1:
The patent introduces modified dihydroxyterephthalic acid diamides as an intermediary substance that enables bleach-free liquid detergents to effectively remove bleachable stains. These diamides act as a mediator between the surfactant system and polyphenolic dye stains, providing oxidation-like cleaning action without requiring actual bleach, thus maintaining formulation stability while achieving stain removal.
Data Source
AI summary
The invention relates to a liquid composition, in particular for washing textiles, containing the following, in each case based on the total weight of the composition: - a total quantity of 20 to 70 wt.% of surfactant and - at least one catechol compound of the formula (I), in which R1 and R2 independently of each other represent a hydrocarbon group with at least three carbon atoms. The invention also relates to a method for treating a substrate, having the steps of (a) providing an aqueous liquor by mixing 0.5 L to 40.0 L of water with 0.5 to 100 g of said composition and (b) bringing a substrate, in particular a textile, into contact with the aqueous liquor produced according to step (a), and to the use of an aqueous liquor which can be obtained by mixing 0.5 L to 40.0 L of water with 0.5 to 100 g of said composition in order to treat textiles, in particular in order to clean textiles.