Detergent Composition Foam Control via Surfactant Chain Length
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Solution Overview
Problem
Existing alcohol ether sulfate surfactants in laundry detergents often result in excessive foam levels, leading to overfoaming and increased water usage during rinsing.
Innovation Solution
Incorporating a combination of C16 and/or C18 ether sulfate surfactants in specific weight ratios with other surfactants and cleaning boosters to control foam levels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If C12 and C14 alcohol ether sulfate surfactants are used in laundry detergents, then soil removal efficiency is improved, but foam levels become excessively high
Solution Approach 1:
The patent changes the chain length parameter of the alcohol ether sulfate surfactant from C12-C14 to C16-C18, which fundamentally alters the foam-generating properties while maintaining cleaning effectiveness. This parameter change resolves the contradiction by selecting surfactant molecules with longer hydrocarbon chains that produce less foam but retain soil removal capability
Solution Approach 2:
The patent creates a composite surfactant system combining C16/C18 alcohol ether sulfates with C12/C14 alcohol ether sulfates in specific ratios (weight ratio 1:4 to 4:1). This composite approach allows the C16/C18 components to suppress excessive foam while the C12/C14 components maintain high soil removal efficiency, resolving the contradiction through synergistic combination
2Productivity
If high foam levels are generated by C12 and C14 ether sulfates, then cleaning performance is enhanced, but water consumption increases during rinsing
Solution Approach 1:
By changing the surfactant chain length parameter to C16-C18, the patent reduces foam generation at the source, which directly decreases the amount of rinse water needed to remove foam. This parameter change addresses both cleaning performance and water consumption simultaneously
Solution Approach 2:
The patent converts the typically harmful excessive foam into a beneficial feature by using C16/C18 ether sulfates that provide adequate foaming for cleaning performance while naturally limiting foam excess, thereby reducing rinse water requirements. The foam that is generated becomes useful for soil suspension and removal rather than being a waste product
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 significantly reduces foam levels and enhances soil removal efficiency, providing improved washing performance with reduced water consumption.
Implementation Method 1
a key problem with these types of alcohol ether sulfates is foam control. For lauryl (C12) and myristyl (C14) ether sulfates, foam levels can be extremely high... this problem can be solved by inclusion of a C16 and/or C18 ether sulfate
Data Source
AI summary
A detergent composition, comprising: (a) from 2 to 25 wt.% of an alcohol ether sulfate of formula R1-(OCH2CH2)mOSO3H where R1 is saturated or monounsaturated, preferably saturated, linear C12 and/ or C14 alkyl chain and where m is from 1 to 4; and, (b) from 2 to 25 wt.% of an alcohol ether sulfate of formula R2-(OCH2CH2)nOSO3H where R2 is saturated or monounsaturated linear C16 and/or C18 alkyl chain and where n is from 5 to 20; wherein the weight ratio of (a) to (b) is from 5:1 to 1:8. A domestic method of treating a textile with an aqueous solution of 0.5 to 20 g/L of said detergent composition.