Liquid Crystal Emulsion Homogenization for White Speck Elimination
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Solution Overview
Problem
Challenges were encountered during the process development of a liquid crystal structure emulsion, resulting in the formation of white specks due to incomplete solubilization of phospholipids and fatty alcohols, which affected the aesthetic appearance and stability of the product.
Innovation Solution
A specified homogenizer configuration involving three stages of rotor and stator, along with a shear energy density of at least 4.93 to 8.22 W/kg/s, ensures the proper intercalation of fatty alcohol with phospholipids, leading to a stable and aesthetically pleasing liquid crystal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional homogenization methods are used, then the manufacturing process is simple, but white specks form due to incomplete solubilization of phospholipids and fatty alcohols
Solution Approach 1:
The homogenization process is divided into three distinct stages with progressively finer rotor-stator configurations. Stage 1 uses a coarse homogenizer for initial mixing, Stage 2 uses a medium homogenizer for intermediate emulsification, and Stage 3 uses a fine homogenizer for final microemulsification. This segmentation allows each stage to perform a specific function, achieving complete solubilization without requiring a single complex device.
Solution Approach 2:
The patent employs dynamic adjustment of homogenization parameters including variable shear energy density (4.93-8.22 W/kg/s), adjustable rotor speeds, and progressive stage transitions. The system adapts the intensity and duration of homogenization at each stage based on the emulsion development needs, optimizing solubilization efficiency while preventing white speck formation.
2Reliability
If insufficient shear energy density is applied, then energy consumption is low, but molecular association of ingredients is inadequate leading to white specks
Solution Approach 1:
The patent specifies an optimized shear energy density range of 4.93-8.22 W/kg/s across the three homogenization stages. This parameter change ensures adequate molecular association between phospholipids and fatty alcohols to prevent white speck formation, while the progressive stage approach distributes energy consumption efficiently throughout the process rather than requiring excessive energy at a single stage.
3Reliability
If phospholipid concentration is increased to improve skin barrier protection, then moisturization effectiveness increases, but solubility limit is exceeded causing white specks
Solution Approach 1:
The three-stage homogenization process segments the incorporation of phospholipids into the emulsion system. Each stage progressively integrates phospholipid molecules at controlled rates, allowing high concentrations to be fully solubilized without exceeding local saturation limits. This prevents phase separation and white speck formation even when total phospholipid content is optimized for skin barrier protection.
Solution Approach 2:
The continuous three-stage homogenization process maintains constant mechanical energy input and molecular mixing throughout the emulsion formation. This continuous action ensures that phospholipids are progressively and uniformly distributed and solubilized throughout the continuous phase, preventing local supersaturation and maintaining composition stability at high phospholipid concentrations.
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 specified homogenization process results in a stable liquid crystal structure with improved skin barrier protection and enhanced molecular association of ingredients, eliminating white specks and ensuring a smooth, fluid-like texture.
Implementation Method 1
a shear energy density of at least 4.93 to 8.22 W/kg/s, ensures the proper intercalation of fatty alcohol with phospholipids
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(d)
Figure 3(a)~3(e)
AI summary
The use of specified homogenizer configuration, i.e., stator and rotor and shear energy density, to form a liquid crystal structure between the negatively charged phospholipid and/or phospholipid derivative and fatty alcohol is disclosed.