Aluminum Flake Paste Brightness and Stability
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Solution Overview
Problem
The production of aluminum flake paste with high brightness is hindered by the increased solubility of fatty acids in aromatic hydrocarbon solvents, leading to reduced storage stability due to increased aggregation of aluminum flakes.
Innovation Solution
The method involves flaking aluminum powder in an aromatic hydrocarbon solvent to produce flakes with higher circularity, followed by treating them with an organic compound having a polar group to inhibit aggregation and improve storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an organic solvent containing an aromatic hydrocarbon as a main ingredient is used as a grinding solvent, then the brightness of aluminum flakes is improved, but the storage stability of aluminum flake paste deteriorates
Solution Approach 1:
A polar compound is introduced as an intermediary substance that mediates between the aromatic hydrocarbon solvent and aluminum flakes. The polar compound preferentially adsorbs onto the aluminum flake surfaces, creating a protective interface that prevents direct interaction between the flakes and the solvent, thereby inhibiting aggregation while maintaining the brightness-enhancing effects of the aromatic hydrocarbon solvent
Solution Approach 2:
The invention changes the chemical parameter of the grinding system by adding a polar compound with specific polarity characteristics. This parameter change modifies the interfacial properties between the solvent and aluminum flakes, creating a new equilibrium state where both high brightness and storage stability are achieved simultaneously
2Strength
If fatty acids are added as a grinding aid during flaking, then the surface protection and parallel alignment of aluminum flakes is improved, but the amount of fatty acid adhered to the surface decreases when aromatic hydrocarbon solvent is used, leading to increased aggregation
Solution Approach 1:
The polar compound serves as a superior intermediary that replaces the insufficient fatty acid layer. It has higher polarity than fatty acids, enabling stronger adsorption onto the aluminum flake surfaces and providing more effective surface protection and aggregation inhibition in the aromatic hydrocarbon solvent environment
Solution Approach 2:
The invention changes the chemical parameter of the surface treatment by replacing or supplementing fatty acids with polar compounds that have different polarity characteristics. This parameter change ensures sufficient surface coverage and protection even in the presence of aromatic hydrocarbon solvent
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
This approach results in an aluminum flake paste that maintains high brightness while ensuring storage stability by reducing aggregation and enhancing the adhesion of polar compounds to the flakes.
Implementation Method 1
solubility of fatty acids such as oleic acid and stearic acid in the grinding solvent increases in comparison with the case where an organic solvent containing an aliphatic hydrocarbon as a main ingredient
Implementation Method 2
treating the aluminum flakes obtained in the first step with an organic compound having a polar group, and forming the treated flakes into a paste
Data Source
AI summary
The present invention is a method for producing an aluminum flake paste including a first step of flaking a raw material aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main ingredient to give aluminum flakes, and a second step of treating the aluminum flakes obtained in the first step with an organic compound having a polar group, and forming the treated flakes into a paste.