Asymmetrical Flake with Carrier-Repellent Coating
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Solution Overview
Problem
Existing reflective flakes used in carrier media are sensitive to mechanical wear due to weak bonds between hydrophobic pigment surfaces and aqueous carriers, leading to shedding of pigment particles.
Innovation Solution
Development of asymmetrical reflective flakes with a metal reflector layer having a concave and convex surface, coated with a carrier-repellent material on one side to self-align in the carrier, enhancing reflectivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If hydrophobic coating is applied to reflective pigment particles to improve glittering properties, then reflectivity is improved, but mechanical wear resistance deteriorates due to weak bonds with aqueous carrier
Solution Approach 1:
The patent applies carrier-repellent coating only on the convex surface of the flake, leaving the concave surface uncoated. This local differentiation allows the convex surface to provide wear resistance and maintain reflectivity, while the concave surface maintains strong bonding with the aqueous carrier through its hydrophilic metal oxide coating, thus resolving the contradiction between reflectivity and mechanical wear resistance.
Solution Approach 2:
The patent creates an asymmetrical flake structure where one surface (convex) has carrier-repellent coating and the other surface (concave) has hydrophilic coating. This asymmetry enables differential functionality: the convex surface resists carrier adhesion to maintain optical properties, while the concave surface bonds strongly to the carrier for mechanical stability, resolving the wear resistance contradiction.
2Ease of operation
If asymmetrical flake structure is created with concave and convex surfaces, then self-alignment and optical effects are improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs spherical curvature differentiation with concave and convex surfaces on the flake structure. This curvature design enables self-alignment in the carrier medium through buoyancy and surface tension effects, while the spherical geometry can be efficiently manufactured using conventional ceramic ball-milling or extrusion techniques, balancing self-alignment capability with manufacturing feasibility.
3Ease of operation
If carrier-repellent material is coated on both sides of the flake, then uniform orientation is achieved, but bonding with aqueous carrier deteriorates
Solution Approach 1:
The patent selectively applies carrier-repellent coating only on the convex surface while leaving the concave surface with hydrophilic metal oxide coating exposed. This local quality differentiation ensures that the convex surface provides uniform orientation through carrier repulsion, while the concave surface maintains strong bonding with the aqueous carrier, resolving the contradiction between uniform orientation and bonding strength.
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 asymmetrical flakes achieve improved reflectivity and resistance to mechanical wear, with self-alignment ensuring consistent optical effects and increased durability in carrier media.
Implementation Method 1
a metal reflector layer for reflecting light
Implementation Method 2
a coating of a carrier-repellent material supported by the reflector layer, wherein the carrier-repellent material is coated on the first side and is absent from the second side, for orienting the flake in a carrier
Data Source
Figure 1~4
Figure 5~9
Figure 10a~10d
AI summary
The instant invention provides an asymmetrical orientable flake for use in a carrier. The flake includes a metal reflector layer and a coating of a carrier-repellent material coated on a single side of the flake, for orienting the flake in the carrier so that the flake rests upon the carrier having a first side at least partially out of the carrier and a second side immersed in the carrier. The flake has an asymmetrical feature, such as a color shifting coating on a single surface of the reflector layer. Alternatively, the asymmetrical feature is either a relief symbol or an asytnmeuical profile of the flake.