Laundry Detergent Surfactant Chain Length Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laundry liquid compositions face challenges in achieving improved performance, viscosity, and foaming control, particularly with surfactants of C12 chain lengths, which limits their effectiveness and stability at specific pH ranges.
Innovation Solution
The use of C16 and C18 alkyl ether sulfate and alkyl ethoxylate surfactants, along with benzoate preservatives, within a pH range of 5.0 to 7.0, which enhances performance, viscosity, and reduces foaming, allowing for a more stable and efficient laundry detergent formulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If C12 surfactants are used in laundry liquid compositions, then foaming is enhanced, but viscosity is reduced and performance is limited
Solution Approach 1:
The patent changes the carbon chain length parameter of the surfactant from C12 to C16/C18, which fundamentally alters the physical properties of the composition. This parameter change simultaneously increases viscosity, improves cleaning performance, and reduces foaming, resolving the contradiction between viscosity and performance that existed with C12 surfactants.
2Reliability
If C12 surfactants are used, then foaming is increased, but performance and stability at lower pH levels are reduced
Solution Approach 1:
By changing the surfactant carbon chain length from C12 to C16/C18, the patent simultaneously improves pH stability and reduces excessive foaming. The longer chain length provides better stability at lower pH levels while naturally reducing foaming characteristics, thus resolving the contradiction between reliability and harmful factors.
3Reliability
If alternative preservatives are used outside pH 5.0-7.0 range, then preservation is achieved, but performance is reduced
Solution Approach 1:
The patent changes the pH parameter of the composition to the range 5.0-7.0, which enables the use of benzoate preservatives that are effective at these lower pH levels. This pH parameter change allows for effective preservation while maintaining superior cleaning performance, resolving the contradiction between preservation effectiveness and cleaning strength.
4Strength
If surfactant chain length is increased to C16/C18, then viscosity is increased and performance is improved, but foaming is reduced
Solution Approach 1:
The patent accepts the reduced foaming as a beneficial change rather than a harmful one. The C16/C18 surfactants provide superior cleaning performance and stability while naturally reducing excessive foaming, which is considered a desirable outcome for modern laundry compositions.
Data Source
AI summary
An aqueous laundry liquid detergent comprising alkyl ether sulphate surfactant and alkyl ethoxylate surfactant, wherein either at least 10% wt. of the alkyl ether sulphate surfactant is C16 or C18 alkyl, or at least 10% wt. of the alkyl ethoxylate surfactant is C16 or C18 alkyl, from 0.01 to 3% wt. of the composition benzoate salt and wherein the composition has a pH of from 5.0 to 7.0.