Solid Laundry Detergent Formulation for Clear Wash Liquor
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Solution Overview
Problem
Granular laundry detergents face a challenge in simultaneously achieving good fabric-cleaning performance, dispensing profile, and dissolution profile, especially in hard water conditions, where anionic detersive surfactants tend to precipitate due to complexation with calcium ions, and traditional builders like zeolite and phosphate can lead to poor dissolution and environmental concerns.
Innovation Solution
A solid laundry detergent composition is formulated with specific ratios of alkoxylated and non-alkoxylated anionic detersive surfactants, minimal or no zeolite and phosphate builders, and silicate salt, optimized to maintain surfactant activity and form a clear wash liquor, using specific surfactant forms and ratios to enhance stability and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anionic detersive surfactants are used to improve fabric-cleaning performance, then cleaning effectiveness is improved, but the surfactant precipitates due to complexation with calcium ions in hard water
Solution Approach 1:
The patent introduces alkyl polyglucoside as a mediator between the anionic detersive surfactant and calcium ions. This non-ionic surfactant preferentially binds to calcium ions through its glucoside head group, preventing the anionic surfactant from complexing with calcium and precipitating. The alkyl polyglucoside acts as a calcium-sequestering intermediary that maintains anionic surfactant solubility and cleaning effectiveness in hard water conditions.
Solution Approach 2:
The patent changes the chemical parameters of the surfactant system by combining anionic detersive surfactants with alkyl polyglucosides in specific ratios (0.1-10 wt% alkoxylated anionic, 1-25 wt% non-alkoxylated anionic, 0.1-5 wt% alkyl polyglucoside). This parameter change creates a synergistic system where the non-ionic alkyl polyglucoside modifies the overall surfactant behavior, preventing calcium complexation while maintaining cleaning performance.
2Stability of the object's composition
If zeolite builders are used to sequester calcium ions and prevent surfactant precipitation, then surfactant stability is improved, but the detergent composition dissolves poorly and leaves residues on fabric
Solution Approach 1:
The patent extracts or removes zeolite builders from the detergent formulation, replacing them with water-soluble alternatives. By eliminating the water-insoluble zeolite component, the formulation achieves complete dissolution without leaving residues on fabric, while maintaining surfactant stability through the use of alkyl polyglucoside and reduced phosphate levels.
Solution Approach 2:
The patent changes the builder system parameters by significantly reducing phosphate builder levels (0-4 wt%) and eliminating zeolite, replacing them with water-soluble builders. This parameter change transforms the dissolution characteristics of the entire detergent composition, enabling complete solubility while maintaining water softening and surfactant stabilization functions.
3Reliability
If phosphate builders are used to improve cleaning performance in hard water, then cleaning effectiveness is improved, but environmental concerns arise and dissolution is compromised
Solution Approach 1:
The patent changes the chemical composition parameters by reducing phosphate builder levels to 0-4 wt% and replacing traditional phosphate systems with alternative water-soluble builders combined with alkyl polyglucoside. This parameter modification maintains cleaning effectiveness through synergistic surfactant interactions while eliminating the environmental harm associated with high phosphate discharge.
4Reliability
If the detergent formulation is optimized for fabric-cleaning performance, then cleaning effectiveness is improved, but dispensing and dissolution profiles deteriorate
Solution Approach 1:
The patent changes the formulation parameters by using a specific combination of surfactant types and concentrations (alkoxylated anionic 0.1-10 wt%, non-alkoxylated anionic 1-25 wt%, alkyl polyglucoside 0.1-5 wt%) along with water-soluble builders. This parameter optimization achieves a balance where the formulation maintains excellent cleaning performance while ensuring complete dissolution and good dispensing characteristics.
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 provides excellent greasy stain cleaning, whiteness maintenance, and clear wash liquor formation, while minimizing water-insoluble residues and environmental impact, ensuring effective performance across varying water hardness.
Implementation Method 1
the anionic detersive surfactant is capable of complexing with free cations, such as calcium and magnesium cations, that are present in the wash liquor in such a manner as to cause the anionic detersive surfactant to precipitate out of solution
Implementation Method 2
cause the anionic detersive surfactant to precipitate out of solution
Implementation Method 3
These builders sequester free calcium and magnesium cations and reduce the formation of these undesirable complexes
Implementation Method 4
builders, such as zeolite builders and phosphate builders, which have a high binding constant with cations such as calcium and magnesium cations
Data Source
AI summary
A solid laundry detergent composition comprising: (a) from 0.1 wt % to 10 wt % of an alkoxylated anionic detersive surfactant; (b) from 1 wt % to 25 wt % of an non-alkoxylated anionic detersive surfactant; (c) from 0 wt % to 4 wt % zeolite builder; (d) from 0 wt % to 4 wt % phosphate builder; and (e) from 0 wt % to 10 wt % silicate salt.