Water-Swellable Clay Mineral Laminated Powder Dye Stability
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Solution Overview
Problem
Current water-swellable clay mineral complexes used in cosmetics and coloring applications face issues with lightfastness, chlorine resistance, and dye stability, particularly with acid dyes, which tend to leach out and have poor color rendering due to limited dye content and refractive index limitations.
Innovation Solution
A method involving the creation of laminated powders by alternately depositing ionic molecules and water-swellable clay minerals on a base powder, followed by complexation with polybases and nonionic hydrophilic polymers to enhance charge density and intercalate dyes within the clay mineral layers, resulting in improved dye/water-swellable clay mineral complexes with increased resistance and coloring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water-swellable clay mineral is complexed with acid dye to improve coloring capability, then dye content and color rendering are enhanced, but lightfastness and chlorine resistance deteriorate due to dye leaching
Solution Approach 1:
The patent applies nesting by placing acid dye molecules inside the interlayer spaces of water-swellable clay mineral. The dye is intercalated between clay layers and fixed through ionic interactions with cations, creating a nested structure where the dye is contained within the clay matrix. This prevents dye leaching while maintaining high dye content and color rendering capability.
Solution Approach 2:
The patent creates a composite material system combining water-swellable clay mineral, polybase, and acid dye. The clay mineral serves as the matrix, polybase acts as a binding agent with ionic functional groups, and acid dye provides coloring. This composite structure enhances both lightfastness and chlorine resistance while maintaining high dye content through synergistic interactions between components.
2Ease of manufacture
If simple dye complexation is used to achieve coloring function, then the process is simple, but dye stability and resistance to external factors deteriorate
Solution Approach 1:
The patent applies preliminary action by first treating the water-swellable clay mineral with polybase before adding the acid dye. The polybase is pre-adsorbed onto the clay surface and intercalated into the layers, creating a prepared matrix with enhanced ionic binding capacity. This preliminary treatment ensures that when acid dye is added, it becomes firmly fixed through ionic interactions, significantly improving dye stability without complicating the overall process.
3Quantity of substance
If high dye content is achieved through simple mixing, then coloring capability is improved, but dye leaching and poor lightfastness occur
Solution Approach 1:
The patent applies nesting by placing acid dye molecules inside the interlayer spaces of water-swellable clay mineral. The dye is intercalated between clay layers and fixed through ionic interactions with cations, creating a nested structure where the dye is contained within the clay matrix. This prevents dye leaching while maintaining high dye content and color rendering capability.
Solution Approach 2:
The patent uses polybase as an intermediary substance between water-swellable clay mineral and acid dye. The polybase with ionic functional groups mediates the interaction by forming ionic bonds with both the clay mineral surface and the acid dye molecules. This intermediary mechanism firmly anchors the dye within the clay structure, preventing leaching while allowing high dye 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 approach results in enhanced lightfastness, chlorine resistance, and improved dye stability, allowing for better color rendering and increased dye content, making the complexes suitable for use as water-type coloring agents with high transparency and hiding power.
Implementation Method 1
By the LbL method, which has been actively investigated in recent years, a base material with the opposite charge to that of the base material is successively adsorbed in a dilute aqueous solution or dispersion by electrostatic interaction.
Implementation Method 2
a complex can be easily prepared by adsorbing molecules on the cations or by intercalating molecules by replacing the interlayer cations or water molecules
Implementation Method 3
intercalating molecules by replacing the interlayer cations or water molecules
Data Source
AI summary
The water-swellable clay mineral laminated powder of the present invention is characterized in that a layer of ionic molecule having two or more ionic functional group is laminated on the surface of a base powder particle, and a layer of water-swellable clay mineral is laminated thereon, and the layers are sequentially laminated so that the surface charge or the ionic charge of each layer is alternately positive and negative. The water-swellable clay mineral laminated powder of the present invention can impart new functionalities to the base powder easily, as a result of that the water-swellable clay mineral is stably laminated on the surface of the base powder.And the dye/water-swellable clay mineral complex of the present invention is characterized in that polybase and/or nonionic hydrophilic polymer and dye are complexed to water-swellable clay mineral. The dye/water-swellable clay mineral complex of the present invention is excellent for various resistance characteristics of the dye such as dissolution resistance, lightfastness, and chlorine resistance. In addition, the dye/water-swellable clay mineral complex is very useful as a water-type coloring agent since it has excellent coloring abilities, clearness, and dye fastness in water.