Spherical Boron Nitride Particles for Resin Fluidity
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Solution Overview
Problem
Inorganic fillers in resins typically decrease fluidity, and existing boron nitride particles do not effectively maintain resin fluidity when blended.
Innovation Solution
Spherical boron nitride particles with a B1s/O1s ratio of 90 or less, produced through a cavitation treatment, are used to enhance the fluidity of resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fillers are blended in resins, then the resin composition gains enhanced mechanical and thermal properties, but the fluidity of the resin composition decreases
Solution Approach 1:
The invention uses spherical boron nitride particles instead of conventional flake-shaped particles. The spherical shape with high circularity (0.93 or more) reduces interparticle friction and improves flow characteristics, allowing the resin composition to maintain excellent fluidity while incorporating the filler. This resolves the contradiction by changing the geometric form from flake to sphere.
Solution Approach 2:
The invention controls the average particle diameter within a specific range (1-10 μm, preferably 2-5 μm) and maintains a narrow particle size distribution (span value of 1.05 or less). These parameter optimizations ensure that the filler particles do not excessively increase viscosity while maintaining the desired mechanical and thermal properties, thus balancing fluidity and performance.
2Strength
If filler content in resin composition is increased, then the mechanical strength and thermal conductivity improve, but the viscosity increases and processing becomes difficult
Solution Approach 1:
The spherical shape of the boron nitride particles enables them to roll rather than slide against each other, significantly reducing interparticle friction. This allows higher filler contents to be incorporated into the resin without causing excessive viscosity increase, thereby maintaining processability while achieving enhanced mechanical strength and thermal conductivity.
Solution Approach 2:
By optimizing the particle size parameters (average diameter of 1-10 μm and span value of 1.05 or less), the invention ensures that the filler particles can be densely packed without creating excessive voids or agglomeration. This parameter optimization allows high filler content to be achieved while maintaining low viscosity and good processing characteristics.
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 spherical boron nitride particles significantly improve the fluidity of resin compositions, maintaining low thixotropy indices even at varying shear rates, thereby enhancing processing efficiency.
Implementation Method 1
generating cavitation bubbles in a liquid including raw material spherical boron nitride particles and water
Data Source
AI summary
Provided are spherical boron nitride particles having a B1s/O1s ratio of 90 or and less, the B1s/O1s ratio being a ratio of a semiquantitative value calculated from an O1s peak intensity measured by X-ray photoelectron spectroscopy and a semiquantitative value calculated from a B1s peak intensity. For viscosities, measured at 25° C. with a shear rate being changed from 0.01 (1/s) to 100 (1/s), of a mixture in which 15 volume % of the spherical boron nitride particles are filled in an epoxy resin, a thixotropy index (T.I. index) represented by a ratio (η1/η2) of a viscosity η1 measured when the shear rate is 1 (1/s) and a viscosity η2 measured when the shear rate is 10 (1/s) is preferably 2 or less.