Acidic Hand Dishwashing Detergent Composition for Low-Temperature Stability
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Solution Overview
Problem
Existing liquid hand dishwashing compositions face challenges in achieving effective foaming, rinsing, and antimicrobial efficacy, especially at low temperatures, while maintaining good suds mileage and grease cleaning, particularly when formulated with lactic acid.
Innovation Solution
A liquid hand dishwashing composition comprising a surfactant system with a specific ratio of alkyl sulfated anionic surfactant and sulfonated anionic surfactant, combined with lactic acid, at a pH of less than 5, which provides improved foaming, grease cleaning, and enhanced antimicrobial efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lactic acid is used in liquid hand dishwashing compositions to provide antimicrobial efficacy, then antimicrobial efficacy is improved, but the composition stability and suds mileage at low temperatures deteriorates
Solution Approach 1:
The patent adjusts the pH parameter of the composition to be within the range of 2-4, which optimizes the antimicrobial efficacy of lactic acid while maintaining composition stability and suds mileage at low temperatures. This parameter change resolves the contradiction by finding the optimal pH range where all three requirements are satisfied simultaneously.
2Productivity
If alkyl ethoxylate sulfated anionic surfactants are used to provide good foaming and cleaning, then suds mileage and cleaning effectiveness are improved, but the composition becomes less stable at low temperatures
Solution Approach 1:
The patent changes the chemical structure parameter of the surfactant by specifying alkyl ethoxylate sulfated anionic surfactants with a controlled average degree of ethoxylation of 0.5-3.0, which optimizes both suds mileage and low temperature stability. This structural parameter change allows the surfactant to maintain effectiveness across different temperatures.
3Reliability
If the pH of the composition is lowered to enhance antimicrobial efficacy, then antimicrobial action is improved, but the cleaning effectiveness and foam stability deteriorate
Solution Approach 1:
The patent optimizes the pH parameter to a specific range of 2-4, which balances antimicrobial efficacy with cleaning effectiveness and foam stability. This parameter optimization ensures that all three functions are achieved simultaneously without significant compromise to any single one.
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 robust antimicrobial efficacy, good foaming, and effective grease cleaning, with consistent suds mileage and physical stability, even at low temperatures, ensuring a reliable cleaning experience.
Implementation Method 1
The lactic acid exhibits antimicrobial efficacy while being suitable for use in liquid hand dishwashing compositions, when used in compositions having an acidic pH
Implementation Method 2
formulators of hand dishwashing detergent compositions have traditionally formulated with anionic surfactants, including alkyl ethoxylate sulfated anionic surfactants as they are both highly sudsing and provide liquid detergent compositions that are stable at low temperatures
Implementation Method 3
provide good foaming and cleaning benefits
Data Source
AI summary
The need for a liquid hand dishwashing detergent composition comprising lactic acid, having improved antimicrobial efficacy is met by formulating the composition with an anionic surfactant comprising sulfonated anionic surfactant and alkyl sulfated anionic surfactant, wherein the alkyl sulfated anionic surfactant has an average degree of alkoxylation of less than 0.1.