Water-Binding Agents in Liquid Detergent Films
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Solution Overview
Problem
High water content liquid laundry detergents are incompatible with water-soluble films, leading to instability and difficulty in forming stable unit dosage forms, which results in issues like calcium carbonate precipitation, fabric encrustation, and challenges in maintaining homogeneity and solubility, especially under temperature variations.
Innovation Solution
Aqueous liquid detergent compositions with a water-binding agent like potassium acetate and a chloride salt, such as potassium chloride, are formulated to maintain stability and compatibility with water-soluble films, ensuring the detergent remains homogeneous and dissolves effectively across a wide temperature range, even after extended storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high water content liquid laundry detergent is used, then faster delivery and dispersibility of detergent ingredients is achieved, but compatibility with water-soluble films is lost
Solution Approach 1:
Water-binding agents (inorganic salts like sodium sulfate, potassium sulfate, sodium chloride, potassium chloride) are introduced as intermediary substances that bind excess water and reduce its activity. This mediation allows the high-water-content detergent to coexist stably with water-soluble film packages without causing premature dissolution, while still maintaining fast dispersibility during the wash cycle.
Solution Approach 2:
The water activity (aw) parameter is controlled by adding water-binding agents to reduce it to a range of 0.60-0.95, which prevents the water-soluble film from dissolving during storage. This parameter modification allows the system to maintain both high water content for fast dispersibility and low water activity for film stability.
2Reliability
If water-soluble alkaline carbonate builder is used to prevent film dissolution, then package stability is improved, but calcium carbonate precipitation and fabric encrustation occur
Solution Approach 1:
The harmful alkaline carbonate builder (source of calcium carbonate precipitation) is extracted/removed from the formulation. Instead, water-binding agents are used to achieve package stability, eliminating the side effect of fabric encrustation while maintaining film stability during storage.
Solution Approach 2:
Water-binding agents (inorganic salts) are used as temporary, inexpensive substitutes for alkaline carbonate builders. These salts provide the necessary water activity control during storage but do not cause the harmful precipitation effects, making them a superior disposable component for this application.
3Ease of operation
If high water content liquid detergent is formulated, then aesthetic appearance and faster dispersibility are achieved, but homogeneity and solubility stability under temperature variations are compromised
Solution Approach 1:
Water-binding agents act as intermediary substances that stabilize the aqueous system against temperature-induced phase separation and precipitation. These inorganic salts bind water molecules, preventing them from participating in unwanted reactions or causing crystallization during temperature fluctuations, thus maintaining homogeneity and solubility stability.
Solution Approach 2:
The detergent formulation becomes a composite system combining water, water-binding agents, surfactants, and other detergent components. This composite structure leverages the water-binding agents' ability to stabilize water structure, creating a more robust formulation that maintains homogeneity across a wide temperature range while preserving the aesthetic and dispersibility benefits of high water content.
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 formulation allows for a stable, high-water content liquid detergent that remains compatible with water-soluble films, preventing film dissolution and ensuring rapid dispersion and dissolution in wash cycles, while reducing costs and maintaining product integrity over time.
Implementation Method 1
The use of a water-soluble alkaline carbonate builder in the detergent composition can help prevent the aqueous detergent composition from dissolving the water-soluble package material
Implementation Method 2
In liquid laundry detergent compositions, the incorporation of a large amount of detergent builder poses a significant formulation challenge since the presence of a major quantity of detergent builder inevitably causes the detergent composition to phase separate
Implementation Method 3
sodium carbonate forms an extensive array of low water soluble hydrates at low temperatures and high, i.e., >15 wt. % levels of the sodium carbonate builder
Data Source
AI summary
An article is provided herein which includes an aqueous liquid detergent and a package for the aqueous liquid detergent which is in direct contact with the aqueous liquid detergent, wherein the package is formed from a water-soluble, film-forming material. The aqueous liquid detergent includes at least about 25% by weight of water based on the total weight of the aqueous liquid detergent, and at least about 25% by weight of a water-binding agent based on the total weight of the aqueous liquid detergent. The pH of the aqueous liquid detergent is in the range of about 7 to about 10, and the water activity of the aqueous liquid detergent is in the range of about 0.34 to about 0.64.