Hexagonal Boron Nitride Powder Aggregation Control
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Solution Overview
Problem
Hexagonal boron nitride powder tends to form agglomerated lumps, affecting the spreadability of cosmetic preparations, which is a concern for meeting customer demands for superior spreadability and slipperiness in products like foundation.
Innovation Solution
A hexagonal boron nitride powder with a low oxygen content to specific surface area ratio, determined through nitrogen adsorption, and a large coating area proportion on an adhesive surface, is produced using a method involving calcination, firing, purification, and annealing steps to suppress aggregation and enhance spreadability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hexagonal boron nitride powder is used to improve slipperiness in cosmetic preparations, then slipperiness is enhanced, but the powder forms agglomerated lumps which deteriorates spreadability
Solution Approach 1:
The patent changes the oxygen content parameter of hexagonal boron nitride powder to 0.03 mass% or less, which fundamentally alters the surface properties of the powder. This parameter change reduces surface energy and electrostatic attraction, preventing agglomeration while maintaining the lubricating function, thus resolving the contradiction between slipperiness and spreadability
Solution Approach 2:
The patent applies local quality by creating a specific surface characteristic (low oxygen content) on the hexagonal boron nitride particles. The surface is modified to have reduced polarity and adhesion properties locally, allowing particles to maintain individuality and disperse uniformly, thereby improving spreadability without sacrificing the lubricating slipperiness
2Area of stationary object
If hexagonal boron nitride powder with high surface area is used to improve coverage, then coverage is enhanced, but moisture adsorption increases which deteriorates stability
Solution Approach 1:
The patent changes the oxygen content parameter to 0.03 mass% or less, which alters the chemical composition and surface energy of the powder. This parameter change reduces the affinity for water molecules, allowing the powder to maintain high surface area for coverage while resisting moisture adsorption, thus resolving the contradiction between coverage and stability
Solution Approach 2:
The patent converts the potentially harmful effect of high surface area (which normally increases moisture adsorption) into a benefit by controlling oxygen content. The low oxygen content creates a hydrophobic surface that repels moisture, transforming the high surface area from a liability into an asset for enhanced coverage without stability compromise
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 resulting hexagonal boron nitride powder exhibits excellent spreadability and fineness, suitable for cosmetic preparations, with improved dispersibility and reduced moisture adsorption, allowing for better coverage and skin conformity.
Implementation Method 1
moisture is less likely to be adsorbed onto the surface of the hexagonal boron nitride particles in an air atmosphere
Implementation Method 2
static electricity generated on the surface can be reduced
Data Source
AI summary
A hexagonal boron nitride powder, in which a ratio of an oxygen content to a specific surface area (N) determined through nitrogen adsorption is 0.1 [g/100 m2] or less. A hexagonal boron nitride powder, in which a coating area proportion of an adhesive surface for which a ball number is 7 in an inclined ball tack test, specified in JIS Z 0237:2009, with an inclined plate with an inclination angle of 30 degrees is 77% or more when the hexagonal boron nitride powder is applied to and spread on the adhesive surface from one end to the other end of the adhesive surface using a coating plate at a rate of 1 cm/sec.