Liquid Detergent Mixing Sequence for Shading Dye Stability
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Solution Overview
Problem
The preparation of liquid detergent formulations using chlorinated water leads to the breakdown of shading dyes, resulting in reduced performance and increased yellowing of garments, particularly in large-scale production.
Innovation Solution
A process involving the use of chlorinated water with controlled chlorine levels (1.5 to 4.5 ppm) and specific mixing conditions (18-50°C) to form a homogenous mixture, with shading dyes added after the surfactant, minimizes dye exposure to chlorine, ensuring dye stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chlorinated water is used in large-scale production of liquid detergent formulations, then productivity and ease of manufacture are improved, but the shading dye breaks down and discolors leading to reduced performance
Solution Approach 1:
The patent applies preliminary action by adding the shading dye to the surfactant solution before introducing the chlorinated water. This sequence ensures that the dye is already incorporated into the formulation matrix that will protect it from chlorine attack, preventing breakdown while maintaining large-scale production capabilities
Solution Approach 2:
The surfactant acts as an intermediary between the shading dye and the chlorinated water. By first mixing the dye with the surfactant to form a homogenous solution, the surfactant creates a protective environment that shields the dye from direct contact with and degradation by chlorine, thus maintaining dye stability in large-scale production
2Ease of manufacture
If chlorinated water is used to prepare liquid detergent formulations, then manufacturing cost is reduced, but yellowing of garments increases due to dye breakdown
Solution Approach 1:
The patent applies preliminary action by incorporating the shading dye into the surfactant solution before adding chlorinated water. This ensures the dye is protected from chlorine-induced yellowing while maintaining the cost benefits of using chlorinated water in manufacturing
Solution Approach 2:
The surfactant serves as an intermediary that protects the shading dye from chlorine. By pre-mixing the dye with surfactant, the formulation creates a protective matrix that prevents chlorine from causing dye breakdown and subsequent garment yellowing, while still allowing use of economical chlorinated water
3Stability of the object's composition
If shading dyes are added early in the mixing process, then homogeneity is improved, but dye exposure to chlorine increases causing breakdown
Solution Approach 1:
The patent applies preliminary action by adding the shading dye to the surfactant solution before introducing chlorinated water. This creates a homogenous dye-surfactant mixture first, establishing stability while minimizing subsequent chlorine exposure during the final mixing stage
Solution Approach 2:
The surfactant acts as an intermediary medium that allows the shading dye to be evenly distributed (achieving homogeneity) while simultaneously protecting it from chlorine. The dye-surfactant complex formed preliminarily shields the dye from direct chlorine contact during mixing
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 process maintains the integrity and effectiveness of shading dyes in liquid detergents, preventing yellowing and ensuring consistent color retention in washed garments.
Implementation Method 1
the chlorinated water, surfactant and additional ingredients may be mixed together at a water temperature of between 18 and 50 °C to form a homogenous mixture
Data Source
AI summary
The present invention relates to a liquid detergent formulation and a process of preparing same comprising the steps of mixing together with stirring for at least 5 minutes in the presence of at least 30 weight % chlorinated water, a surfactant in an amount of 5 to 50 weight %; additional ingredients in an amount of 0 to 20 weight %, at a water temperature of between 18 and 50 °C; followed by the addition of one or more shading dyes.