Solid Powder Cosmetic Slurry Processing for Smooth, Uniform Surfaces
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Solution Overview
Problem
Existing methods using water as a solvent for producing solid powder cosmetics face challenges in achieving homogeneous dispersion of oil agents, leading to rough surfaces, inconsistent application amounts, and a powdery texture.
Innovation Solution
A method involving the use of an oil-in-water emulsion with specific ratios of color pigment, oil agent, and surfactant, followed by mixing with powder, forming a slurry, and removing the solvent by suction before drying, ensures smooth and uniform cosmetic products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water is used as a solvent for dispersion in wet methods, then environmental friendliness is improved, but homogeneous dispersion of oil agent deteriorates
Solution Approach 1:
A surfactant is introduced as an intermediary substance between water and oil agent. The surfactant has both hydrophilic and hydrophobic parts, allowing it to bridge the two immiscible phases and enable homogeneous dispersion of the oil agent in water-based solvent, thus maintaining environmental friendliness while achieving uniform dispersion.
Solution Approach 2:
The invention changes the chemical parameters of the dispersion system by selecting specific surfactants with appropriate HLB values and molecular structures. This parameter change allows the system to transition from immiscible phases to a stable emulsion, achieving homogeneous dispersion while using water as the continuous phase.
2Ease of manufacture
If oil agent is dispersed in water without surfactant, then manufacturing simplicity is improved, but surface uniformity and application consistency deteriorate
Solution Approach 1:
The surfactant acts as a mediator that enables proper dispersion of oil agent in water. Without this intermediary, the oil and water phases would separate, leading to poor surface uniformity. The surfactant maintains manufacturing simplicity by being added in a single mixing step while ensuring precise and uniform application results.
3Stability of the object's composition
If volatile solvents like hydrocarbons or low-boiling alcohols are used, then dispersion homogeneity is improved, but environmental safety deteriorates
Solution Approach 1:
The invention changes the solvent parameter from volatile organic compounds to water, a non-volatile and environmentally safe solvent. By combining this parameter change with the introduction of surfactant, the system achieves both environmental safety and dispersion homogeneity, eliminating the need for harmful volatile solvents.
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 method produces a solid powder cosmetic with high surface uniformity, consistent application amount, and a smooth, comfortable feel without a powdery texture.
Implementation Method 1
a surfactant in an amount of 12 mass% or higher and 30 mass% or lower with respect to the total amount of the oil agent
Implementation Method 2
thereafter, removing the solvent by suction
Data Source
AI summary
The present invention provides a method for producing a solid powder cosmetic which is high in the surface uniformity of molded products, appropriate in terms of the amount taken upon application, very smooth and comfortable and gives no feeling of powder, even in the case where water has been used as a solvent for dispersion. The present invention relates to a method for producing a solid powder cosmetic comprising the following components (A) to (C): (A) a color pigment in an amount of 0.1 mass% or higher and 34 mass% or lower in the whole of powder; (B) an oil agent in an amount of 3 mass% or higher and 28 mass% or lower with respect to the whole of powder; and (C) a surfactant in an amount of 12 mass% or higher and 30 mass% or lower with respect to the total amount of the oil agent; the method comprising: mixing the powder comprising the component (A) and an oil-in-water emulsion comprising the components (B) and (C) and water to make a slurry, packing the slurry in a cosmetic container, and thereafter, removing the solvent by suction.