Spherical Boron Nitride Fine Powder Surface Treatment for Resin Filling

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Solution Overview

Problem

Existing methods struggle to produce spherical boron nitride fine powders with improved filling properties due to limited surface functional groups, leading to reduced effectiveness as thermally conductive fillers.

Innovation Solution

A surface modification treatment is applied to spherical boron nitride fine powders, incorporating organic functional groups and specific metal elements on the surface, enhancing their filling properties and thermal conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If conventional gas-phase synthesis method is used to prepare spherical boron nitride fine powder, then spherical shape and fine particle size are achieved, but the number of surface functional groups is small resulting in low filling property

Engineering Contradiction:

Improvespherical shapeVSAvoidfilling property

Core Design Contradiction:

ShapeVSQuantity of substance

Solution Approach 1:

The invention changes the chemical composition parameters of the spherical boron nitride surface by introducing metal elements (Si, Ti, Zr, Ce, Al, Mg, Ge, Ga, or V) and organic functional groups through surface treatment. This transforms the surface chemistry without altering the spherical morphology, thereby improving filling property while maintaining the desired shape.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite surface structure on the spherical boron nitride particles by combining metal elements and organic functional groups with the boron nitride base material. This composite surface architecture provides both the spherical shape characteristics and enhanced filling properties through increased surface functionality.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If surface treatment is applied to scaly boron nitride to improve filling property, then some improvement is achieved, but spherical boron nitride fine powder does not show significant improvement due to limited surface functional groups

Engineering Contradiction:

Improvefilling propertyVSAvoideffectiveness of surface treatment

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The invention uses metal elements and organic functional groups as intermediary substances that bridge the gap between the boron nitride surface and the surrounding environment. These intermediaries increase surface functionality and improve filling property by enhancing interfacial interactions, making the surface treatment effective for spherical particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If spherical boron nitride fine powder is used as thermally conductive filler, then thermal conductivity is improved, but filling property in resin compositions remains insufficient

Engineering Contradiction:

Improvethermal conductivityVSAvoidfilling property

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

The invention applies local quality modification by treating only the surface of the spherical boron nitride particles with metal elements and organic functional groups, while the interior maintains its thermal conductivity properties. This localized surface treatment improves filling property without compromising the bulk thermal conductivity of the filler.

Inventive Principle:

Principle #3Local quality

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 treated spherical boron nitride fine powders exhibit superior filling properties and thermal conductivity, making them effective as thermally conductive fillers in resin compositions.

Implementation Method 1

thermally conductive resin composition

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

A surface modification treatment is applied to spherical boron nitride fine powders, incorporating organic functional groups and specific metal elements on the surface

Methodology Applied

Scientific EffectSurface modification: Deposition (physical)

Data Source

PatentEP3530614B1Spherical boron nitride fine powder, method for manufacturing same and thermally conductive resin composition using same

Publication Date: 2025.10.22 DENKA CO LTD

AI summary

The present invention provides a spherical boron nitride fine powder and the other superior in filling property into resin. The present invention relates to a spherical boron nitride fine powder having the following characteristics (A) to (C): (A) the spherical boron nitride fine particles have any one or more of Si, Ti, Zr, Ce, Al, Mg, Ge, Ga, and V in an amount of 0.1 atm % or more and 3.0 atm % or less in its composition on the surface of 10 nm; (B) the spherical boron nitride fine powder has an average particle diameter of 0.05 µm or more and 1 µm or less; and (C) the spherical boron nitride fine powder has an average circularity of 0.8 or more.