Liquid Laundry Detergent Surfactant Ratios for Low-Dioxane 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, and 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, formulated to reduce 1,4-dioxane levels and enhance sebum stain removal, using a narrow distribution of ethylene glycol units and controlled processing to minimize impurities.
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 dioxane formation is reduced, but cleaning efficacy particularly for sebum stains deteriorates
Solution Approach 1:
The patent combines alkyl glycol sulfate anionic surfactant and sulfonate anionic surfactant in a specific ratio (25:75 to 75:25 by weight) to create a synergistic surfactant system. This merging of two different surfactant types resolves the contradiction by maintaining low dioxane levels from the alkyl glycol sulfate while compensating for reduced sebum stain removal through the complementary cleaning mechanisms of sulfonate surfactants.
Solution Approach 2:
The patent optimizes the weight ratio parameters of the two surfactants in the surfactant system, specifically establishing that the alkyl glycol sulfate anionic surfactant comprises 25% to 75% by weight and the sulfonate anionic surfactant comprises 25% to 75% by weight of the total surfactant system. This parameter optimization enables the system to achieve both reduced dioxane formation and maintained cleaning efficacy.
2Object-generated harmful factors
If alkyl sulfate anionic surfactant is used instead of alkyl ether sulfate to eliminate dioxane, then dioxane formation is eliminated, but cleaning performance and low temperature stability deteriorate
Solution Approach 1:
The patent merges alkyl glycol sulfate anionic surfactant with sulfonate anionic surfactant in a balanced ratio to compensate for the limitations of using alkyl sulfate alone. The sulfonate component specifically addresses the cleaning performance deficiency while the alkyl glycol sulfate maintains low dioxane levels, achieving a balanced formulation that neither surfactant could achieve independently.
3Reliability
If conventional ethoxylated surfactants are used, then cleaning performance is maintained, but 1,4-dioxane by-product is formed
Solution Approach 1:
The patent uses alkyl glycol sulfate anionic surfactant as a substitute for conventional ethoxylated surfactants. While this substitution introduces reduced cleaning efficacy as a potential drawback, it simultaneously eliminates or significantly reduces 1,4-dioxane by-product formation. The subsequent optimization through combining with sulfonate surfactant converts this potential harm into a beneficial formulation that achieves both safety and performance.
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 composition achieves improved cleaning performance, especially for sebum stains, while significantly reducing 1,4-dioxane levels, maintaining effective stain removal and stability.
Implementation Method 1
Fabric detergent compositions are typically formulated using a surfactant system which comprises anionic surfactant, typically a combination of alkyl ether sulfate surfactant and sulfonate surfactant
Implementation Method 2
processes are known whereby instead of ethoxylating an alkyl alcohol, an ethylene glycol monomer or oligomer is reacted with an alkene, before sulfation
Implementation Method 3
sulfation processes to make such alkyl ether sulfate anionic surfactants may result in trace residual amounts of 1,4-dioxane by-product being present
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 comprising a sulfonate anionic surfactant and an alkyl glycol sulfate anionic surfactant.