Hexagonal Boron Nitride Powder Charge Attenuation for Cosmetic Spreadability
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Solution Overview
Problem
Hexagonal boron nitride powder tends to form agglomerated lumps due to moisture, which reduces its flowability and slipperiness, posing challenges in cosmetic preparations where excellent spreadability is required.
Innovation Solution
Producing hexagonal boron nitride powder with a higher attenuation rate of positive charges than negative charges, suppressing agglomeration by quickly neutralizing positive charges generated due to moisture, and using this powder in cosmetic preparations to enhance spreadability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hexagonal boron nitride powder is used in cosmetic preparations, then slipperiness and spreadability are improved, but agglomeration occurs due to moisture which impairs flowability and handleability
Solution Approach 1:
The patent changes the surface charge characteristics of hexagonal boron nitride powder by controlling the attenuation rate of positive charges relative to negative charges. This parameter change in electrostatic properties prevents moisture-induced agglomeration while maintaining the desired spreadability in cosmetic preparations.
Solution Approach 2:
The patent converts the harmful effect of charge accumulation (which causes agglomeration) into a beneficial property by engineering the surface charge to have higher positive charge attenuation. This controlled charge behavior prevents moisture attraction while maintaining flowability and spreadability.
2Reliability
If hexagonal boron nitride powder is stored in atmospheric air, then it becomes positively charged by moisture, but this positive charge causes agglomeration
Solution Approach 1:
The patent modifies the electrostatic parameters of hexagonal boron nitride powder by ensuring the positive charge attenuation rate exceeds the negative charge attenuation rate. This parameter adjustment creates a stable charge state that prevents moisture-induced agglomeration during storage in atmospheric conditions.
3Reliability
If conventional hexagonal boron nitride powder is used, then it provides lubricity and thermal conductivity, but it forms agglomerated lumps reducing flowability
Solution Approach 1:
The patent changes the surface electrostatic parameters of hexagonal boron nitride powder by controlling the differential attenuation of positive and negative charges. This modification maintains the inherent lubricity and thermal conductivity while eliminating agglomeration and improving flowability for practical applications.
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 produced hexagonal boron nitride powder effectively prevents agglomeration, ensuring excellent slipperiness and handleability, making it suitable for cosmetic applications with improved spreadability.
Implementation Method 1
an attenuation rate of a positive charge is higher than an attenuation rate of a negative charge when attenuation rates of positive and negative charges determined through charge attenuation measurement are compared with each other
Implementation Method 2
The hexagonal boron nitride powder may be electrically charged due to, for example, friction between particles and friction with an inner wall of a storage container
Implementation Method 3
when a positive charge is generated, the polarity of oxygen atoms in water molecules present in atmospheric air is negative, and therefore a hexagonal boron nitride powder positively charged by moisture in atmospheric air agglomerates
Data Source
AI summary
A hexagonal boron nitride powder, in which an attenuation rate of a positive charge is higher than an attenuation rate of a negative charge when the attenuation rates of the positive and negative charges determined through charge attenuation measurement are compared with each other. A method for producing a hexagonal boron nitride powder includes: a calcination step of firing a raw material powder containing a boron-containing compound powder and a nitrogen-containing compound powder at 600° C. to 1300° C. in an atmosphere of an inert gas, ammonia gas, or a mixed gas thereof to obtain a calcined product containing hexagonal boron nitride; and a firing step of heating and firing a mixed powder containing the calcined product and an aid at 1900° C. to 2100° C. for 10 to 50 hours in an atmosphere of an inert gas, ammonia gas, or a mixed gas thereof.