Hexagonal Boron Nitride Powder Static Charge Control
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Solution Overview
Problem
Hexagonal boron nitride powder tends to form agglomerated lumps due to static electricity generated through friction, which reduces its flowability and slipperiness, posing challenges in cosmetic applications where excellent spreadability is required.
Innovation Solution
A hexagonal boron nitride powder with a charge amount of 0.7 nc/g or less is produced through a method involving calcination and firing steps, followed by pulverization and drying, to minimize static electricity and agglomeration, ensuring excellent spreadability in cosmetic preparations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hexagonal boron nitride powder is used to improve slipperiness and spreadability in cosmetic preparations, then the cosmetic preparation achieves excellent slipperiness and spreadability, but static electricity is generated through friction between particles and with container walls, causing agglomeration that reduces flowability and impairs handleability
Solution Approach 1:
The patent applies the triboelectric effect in reverse by controlling the friction process to generate a specific charge distribution that prevents agglomeration. By using a stirring vane made of polytetrafluoroethylene (PTFE) with four blades to stir the powder at 300 rpm for 5 minutes, the patent converts the harmful static electricity into a beneficial charge state that maintains particle separation and improves flowability and spreadability.
2Stability of the object's composition
If hexagonal boron nitride powder is stirred in a container to mix with other ingredients, then the powder achieves uniform distribution and excellent spreadability, but friction between particles and container walls generates static electricity that causes agglomeration
Solution Approach 1:
The patent introduces a stirring vane made of polytetrafluoroethylene (PTFE) as an intermediary tool to control the friction process. The PTFE material and the specific blade design (four blades, 60 mm diameter) serve as a mediator that generates the desired charge distribution while preventing excessive static electricity buildup. This intermediary device enables uniform mixing while controlling the harmful effects of friction.
3Object-generated harmful factors
If the charge amount of hexagonal boron nitride powder is reduced to suppress agglomeration, then flowability and slipperiness are improved, but the powder may lack sufficient electrostatic properties needed for certain cosmetic functions
Solution Approach 1:
The patent precisely controls the charge amount parameter by optimizing the stirring conditions: using a PTFE stirring vane with four blades, rotating at 300 rpm for 5 minutes. This parameter optimization reduces the absolute charge amount to 0.7 nc/g or less, which is sufficient to prevent agglomeration while maintaining enough electrostatic properties for cosmetic functions such as slipperiness and spreadability.
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 suppresses agglomeration due to static electricity, maintaining excellent spreadability and slipperiness, making it suitable for cosmetic applications.
Implementation Method 1
static electricity generated through friction between particles or friction with an inner wall of a container
Implementation Method 2
static electricity may be generated in a powder due to factors such as friction
Implementation Method 3
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.
Implementation Method 4
firing a raw material powder containing a boron-containing compound powder and a nitrogen-containing compound powder
Implementation Method 5
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
Data Source
AI summary
A hexagonal boron nitride powder, in which an absolute value of a charge amount when 10 g of the hexagonal boron nitride powder is placed in a polyethylene terephthalate container with an inner diameter of 90 mm and a height of 120 mm and stirred at 300 rpm for 5 minutes using a stirring vane 60 mm in diameter with four polytetrafluoroethylene blades is 0.7 nc/g or less.