Hexagonal Boron Nitride Powder Bent Particle Morphology
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Solution Overview
Problem
Conventional hexagonal boron nitride powders fail to fully retain the glitter property when used in combination with glitter pigments, as the interference between the light reflected by the boron nitride powder and the glitter pigment diminishes the inherent glitter effect.
Innovation Solution
Increasing the proportion of boron nitride particles with a bent structure at specific angles and adding carbonates of alkali metals or alkaline earth metals to the raw materials during production, resulting in a hexagonal boron nitride powder with enhanced glitter properties, both alone and when combined with glitter pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional hexagonal boron nitride powder is used in combination with glitter pigment, then smooth feel and shine are retained, but the inherent glitter property of the glitter pigment is not fully obtained
Solution Approach 1:
The patent applies local quality by creating a specific particle morphology distribution where particles with bent structures at angles of 110° to 160° constitute 30% or more of the total particles. This localized structural modification at the particle level optimizes light reflection characteristics while preserving the overall smooth feel, resolving the contradiction between glitter property and skin feel.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the bent structure angle (110° to 160°) and the proportion of such particles (30% or more), along with limiting particle size distribution (0.5 mass% or less at 200 μm or more). These parameter optimizations enhance glitter property through improved light reflection while maintaining the smooth feel characteristic of boron nitride powder.
2Ease of operation
If hexagonal boron nitride powder with flat plate-like structure is used, then excellent lubricity is achieved, but glitter property is insufficient
Solution Approach 1:
The patent introduces asymmetry by modifying the crystal structure to include bent portions at specific angles (110° to 160°) rather than maintaining a perfectly flat plate-like structure. This asymmetric modification creates multiple light reflection pathways that enhance glitter property while preserving the layered structure necessary for lubricity.
Solution Approach 2:
The patent applies curvature by introducing bent structures into the otherwise flat plate-like particles. The bent portions with angles of 110° to 160° create curved light reflection surfaces that enhance glitter effect, while the overall plate-like morphology with controlled thickness (0.5 μm to 3.0 μm) maintains the lubricity characteristic.
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 modified hexagonal boron nitride powder exhibits excellent glitter properties while maintaining lubricity, making it suitable for cosmetic use with improved skin feel and reduced roughness.
Implementation Method 1
By adding one or both of carbonates of alkali metals and carbonates of alkaline earth metals to the raw material used to produce a boron nitride powder and by preparing a hexagonal boron nitride powder under certain conditions, it is possible to produce a hexagonal boron nitride powder satisfying the above condition (1).
Implementation Method 2
a number ratio of particles having a bent structure at an angle of 110° to 160° with respect to (0,0,1) crystal plane of the particles is 30 % or more
Data Source
Figure 1A~1B
AI summary
Disclosed is a hexagonal boron nitride powder having excellent glitter property. A hexagonal boron nitride powder includes hexagonal boron nitride particles, in which among the hexagonal boron nitride particles, a number ratio of particles having a bent structure at an angle of 110° to 160° with respect to (1,0,0) crystal plane of the primary particles is 30 % or more.