Liquid Laundry Detergent Composition for Low-Dioxane Sebum Cleaning
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Solution Overview
Problem
Existing fabric detergent compositions using alkyl glycol sulfate anionic surfactants struggle with reduced cleaning efficacy, particularly for sebum stains, due to their structure, and often contain trace amounts of 1,4-dioxane by-products.
Innovation Solution
A liquid laundry detergent composition comprising a surfactant system with a specific ratio of alkyl glycol sulfate anionic surfactant and sulfonate anionic surfactant, characterized by a narrow distribution of ethylene glycol units and controlled 1,4-dioxane levels, enhances cleaning performance, especially for sebum stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If alkyl glycol sulfate anionic surfactant is used to reduce 1,4-dioxane levels, then 1,4-dioxane content is reduced, but cleaning efficacy particularly for sebum stains deteriorates
Solution Approach 1:
The patent changes the molecular structure parameters of the alkyl glycol sulfate surfactant by specifying that the sum of carbon atoms in R1 and R2 must be 15 or more, and controlling the ethoxylation degree (n=1-3). This structural modification improves cleaning efficacy while maintaining low 1,4-doxane levels, resolving the contradiction between reduced harmful factors and maintained reliability.
Solution Approach 2:
The patent creates a composite surfactant system combining alkyl glycol sulfate anionic surfactant with specific auxiliary surfactants (alkyl polyglucoside nonionic surfactant and/or alkyl ether carboxylate nonionic surfactant). This composite approach enhances cleaning performance for sebum stains while the base alkyl glycol sulfate component maintains low 1,4-dioxane content, simultaneously addressing both requirements.
2Reliability
If alkyl ether sulfate anionic surfactant is used to improve cleaning performance, then cleaning efficacy is improved, but 1,4-dioxane by-product formation increases
Solution Approach 1:
The patent extracts and eliminates the ethoxylation step from the surfactant synthesis process. Instead of using alkyl ether sulfate surfactants formed via ethoxylation (which generate 1,4-dioxane), the invention uses alkyl glycol sulfate surfactants formed by direct reaction of alkene with glycol. This removes the source of 1,4-dioxane formation while maintaining cleaning performance through alternative surfactant structure design.
Solution Approach 2:
The patent replaces the conventional alkyl ether sulfate surfactant system with an alternative alkyl glycol sulfate system that achieves similar or better cleaning performance without the harmful by-product formation. This substitution eliminates the need for complex post-processing steps (distillation, evaporation, centrifugation) required to remove 1,4-dioxane, simplifying the overall process.
3Object-generated harmful factors
If alkyl sulfate anionic surfactant is used to eliminate ethoxylation, then 1,4-dioxane formation is eliminated, but low temperature stability deteriorates
Solution Approach 1:
The patent modifies the surfactant structure by incorporating glycol groups (ethylene glycol or propylene glycol) into the alkyl sulfate molecule to create alkyl glycol sulfate. This structural change maintains the elimination of 1,4-dioxane formation while the glycol component provides improved low-temperature stability and solubility, resolving the contradiction between eliminating harmful factors and maintaining compositional stability.
Data Source
AI summary
The need for liquid laundry detergent compositions which comprise very low levels or even no dioxane, while also providing improved removal of sebum and other stains, is met by formulating the detergent composition using alkyl glycol sulfate anionic surfactant having a high fraction of the alkyl glycol sulfate anionic surfactant with a longer alkyl chain length.