Phosphate-Free Liquid Detergent Vesicle Stability
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Solution Overview
Problem
Phosphate-free heavy duty liquid detergents face stability and viscosity issues due to the absence of phosphates, which were previously stabilized by sodium tripolyphosphate, and require the use of undesirable stabilizing and rheology modifying polymers to maintain performance.
Innovation Solution
Aqueous, phosphate-free structured liquid detergent composition comprising a surfactant system with alkyl ether sulfate, anionic surfactants, and a builder system without stabilizing or rheology modifying polymers, achieving stability and desired viscosity through the formation of multilayered vesicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phosphate-free formulations are used, then environmental compliance is improved, but stability and viscosity control deteriorate
Solution Approach 1:
The patent changes the chemical parameters by replacing phosphate builders with alternative builder systems (such as zeolites, citrates, or carboxylic acid builders) and adjusts surfactant combinations and concentrations to achieve both phosphate-free formulation and stable viscosity without phase separation
Solution Approach 2:
The patent uses composite builder systems combining multiple phosphate-free ingredients (e.g., zeolite A with citrate and carboxylic acid builders) and composite surfactant systems (anionic, nonionic, and amphoteric surfactants in specific ratios) to achieve both environmental compliance and formulation stability
2Stability of the object's composition
If stabilizing and rheology modifying polymers are used, then viscosity control is improved, but formulation complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates stabilizing and rheology modifying polymers from the formulation, relying instead on the inherent viscosity-providing capacity of the surfactant-builder system and alternative phosphate-free builders to maintain desired viscosity without additional complex additives
Solution Approach 2:
The surfactant and builder system itself provides the viscosity stabilization function that would otherwise require separate polymer additives, making the system self-sufficient and reducing overall formulation complexity
3Object-affected harmful factors
If phosphate-free formulations are used, then environmental compliance is improved, but performance relative to phosphate-built HDL deteriorates
Solution Approach 1:
The patent optimizes parameters including surfactant HLB values, builder-to-surfactant ratios, and pH levels to maximize detergency performance of phosphate-free formulations, matching or exceeding the performance of traditional phosphate-built HDL detergents
Solution Approach 2:
The patent employs composite surfactant systems combining anionic surfactants (for primary cleaning), nonionic surfactants (for soil suspension and anti-redeposition), and amphoteric surfactants (for foam control and mildness) to achieve superior overall performance comparable to phosphate-based formulations
4Quantity of substance
If high concentrations of builders and surfactants are used, then detergent effectiveness is improved, but physical and chemical instability increases
Solution Approach 1:
The patent carefully controls the concentration parameters of builders and surfactants within optimized ranges, and adjusts pH and ionic strength parameters to prevent precipitation and phase separation while maintaining high effectiveness for detergent action
Solution Approach 2:
The patent uses intermediary substances such as chelating agents (EDTA, citrates) and sequestering agents that mediate between high concentrations of builders and surfactants, preventing unwanted interactions and precipitation while allowing high levels of active ingredients to coexist stably
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 maintains stability and viscosity over extended periods without polymers, with improved low-temperature stability and no phase separation, ensuring effective textile cleaning without the need for acrylate-containing additives.
Implementation Method 1
In these built HDLs multilayered vesicles are formed that stabilize the formulation and prevent precipitation of the anionic surfactants by the builder components
Data Source
Figure 1~2
AI summary
The present invention relates to an aqueous, phosphate-free, structured liquid detergent composition, in particular a heavy duty liquid detergent (HDL) that comprises a surfactant system comprising an alkyl ether sulfate, a builder system and water, wherein the detergent composition has a viscosity of between 1.000 and 10.000 mPas and is free of stabilizing and rheology modifying acrylate-containing polymers. The invention further relates to methods for washing of textiles using the detergents of the invention.