Ascorbic Acid Dispersion Material with Flat Plate Crystals
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Solution Overview
Problem
Percutaneous absorption liquids containing ascorbic acid particles with small crystal sizes exhibit poor storage stability and usage characteristics, and existing methods for high-concentration ascorbic acid dispersion materials require improved chemical stability and skin application smoothness.
Innovation Solution
An ascorbic acid dispersion material with ascorbic acid crystals of a flat plate shape and specific particle diameter range (50-100 μm) dispersed in a solvent like glycerin, where 40-80% of particles are between 30-120 μm, and a concentration of 20-40 wt%, offering enhanced chemical stability and skin application properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ascorbic acid is dissolved in water at high concentration, then the antioxidative action and whitening effect are enhanced, but the solution becomes unstable and easily oxidized due to light, heat, and pH changes
Solution Approach 1:
The patent introduces a solvent system comprising glycerin, propylene glycol, or polyethylene glycol as intermediaries to dissolve ascorbic acid. These solvents act as mediators that stabilize ascorbic acid against oxidation by light, heat, and metal ions while maintaining high concentration (10-40 wt%), thus resolving the contradiction between high concentration and chemical stability
Solution Approach 2:
The patent changes the physical state and dissolution parameters of ascorbic acid by using alternative solvents with different chemical properties. By adjusting the solvent type and concentration parameters, the solution achieves both high ascorbic acid content and improved stability against oxidation and crystallization
2Stability of the object's composition
If ascorbic acid is dissolved in glycerin at high concentration to improve stability, then storage stability is enhanced, but the solution becomes non-transparent and usage characteristics deteriorate
Solution Approach 1:
The patent segments the ascorbic acid into two forms: dissolved portion (5-30 wt%) and suspended crystal portion (70-95 wt%). This segmentation allows the dissolved portion to provide stability while the suspended crystals maintain transparency and improve usage characteristics upon skin application, resolving the contradiction between stability and ease of operation
Solution Approach 2:
The patent applies local quality by creating a heterogeneous system where ascorbic acid exists in different states (dissolved and suspended) with different functions. The dissolved portion ensures chemical stability, while the suspended crystal portion ensures transparency and skin penetration, allowing each region of the formulation to optimize for its specific function
3Stability of the object's composition
If ascorbic acid crystals with small particle size (less than 20 μm) are used to improve dispersion, then homogeneity is enhanced, but storage stability and usage characteristics deteriorate
Solution Approach 1:
The patent optimizes the particle size parameter of ascorbic acid crystals to a specific range (20-100 μm) to achieve the best balance between dispersion homogeneity and storage stability. This parameter optimization prevents excessive aggregation while maintaining adequate stability, resolving the contradiction between homogeneity and reliability
4Quantity of substance
If ascorbic acid is used at high concentration for percutaneous absorption, then the whitening and anti-aging effects are enhanced, but crystallization occurs leading to poor usage characteristics
Solution Approach 1:
The patent segments ascorbic acid into dissolved and suspended crystal forms, allowing high concentration (10-40 wt%) to be maintained without complete crystallization. The suspended crystals (20-100 μm) provide a balance between maintaining high concentration for efficacy and preventing complete crystallization that would deteriorate usage characteristics
Solution Approach 2:
The patent uses glycerin, propylene glycol, or polyethylene glycol as intermediary solvents that suppress crystallization at high ascorbic acid concentrations. These intermediaries act as crystallization inhibitors, allowing the formulation to maintain high concentration while preserving liquid properties and usage characteristics
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 ascorbic acid dispersion material demonstrates higher chemical stability and superior usage characteristics, including improved spreadability and smoothness upon skin application, while the manufacturing method efficiently produces the material with controlled crystal growth.
Implementation Method 1
an ascorbic acid dispersion material, which is obtained by dispersing an ascorbic acid crystal in a solvent
Implementation Method 2
a heating step involving infusing an ascorbic acid into a solvent, and heating the ascorbic acid to a predetermined temperature to dissolve the ascorbic acid
Implementation Method 3
a cooling step involving cooling the solution with the ascorbic acid dissolved therein to remove heat from the solution
Implementation Method 4
a growth step involving storing the solution after completion of the cooling step for a predetermined period to promote crystal growth
Data Source
AI summary
A manufacturing method of an ascorbic acid dispersion material includes a heating step of adding an ascorbic acid into a solvent including one or more selected from the group consisting of glycerin, diglycerin, polyglycerin represented by a following formula, and propylene glycol, and heating the ascorbic acid to a predetermined temperature to dissolve the ascorbic acid; a cooling step of cooling a solution with the ascorbic acid dissolved therein at a cooling rate of 5 to 20° C./min until a temperature of the solution reaches 35 to 50° C. to remove heat from the solution; and a growth step of storing the solution after completion of the cooling step at 27 to 38° C. for a predetermined period to promote crystal growth so that the ascorbic acid crystal has a flat plate shape, a thickness of 0.05 to 3 μm, and an average particle diameter of 50 to 100 μm.