Dilatant Adhesive for Electronic Components

Solution Overview

Problem

Existing dilatancy materials cannot be used for bonding due to their liquid state properties, which fail to provide both flexibility and firmness required for electronic and optical components, especially under varying load conditions.

Innovation Solution

A flexible adhesive material with dispersed particles that deform under low-rate loads and remain unchanged under high-rate loads, comprising a flexible outer shell, fluid, and hard particles, such as silicone oil and silica, to create a dilatant adhesive that offers flexibility for normal conditions and firmness upon impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a flexible adhesive material is used to bond optical components, then distortion is prevented under normal conditions, but the bonding strength is insufficient when impact occurs

Engineering Contradiction:

ImproveflexibilityVSAvoidbonding strength

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The adhesive composition dynamically changes its mechanical properties based on loading rate. Under normal low-rate loading, the adhesive remains flexible to prevent optical component distortion. Under high-rate impact loading, the adhesive transitions to a stiff state to provide strong bonding and prevent component displacement or breakage.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The adhesive's physical parameters (viscosity, modulus) are changed based on the loading rate. The dilatant particles cause the adhesive to exhibit shear-thickening behavior, where the effective viscosity and stiffness increase with increasing shear rate, enabling the adhesive to adapt its properties to different operational conditions.

Inventive Principle:

Principle #35Parameter changes

2Strength

If a firm bonding adhesive is used to fix component position under impact, then bonding strength is improved, but distortion occurs in optical components under normal conditions

Engineering Contradiction:

Improvebonding strengthVSAvoidflexibility

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The adhesive composition dynamically changes its mechanical properties based on loading rate. Under normal low-rate loading, the adhesive remains flexible to prevent optical component distortion. Under high-rate impact loading, the adhesive transitions to a stiff state to provide strong bonding and prevent component displacement or breakage.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The adhesive's physical parameters (viscosity, modulus) are changed based on the loading rate. The dilatant particles cause the adhesive to exhibit shear-thickening behavior, where the effective viscosity and stiffness increase with increasing shear rate, enabling the adhesive to adapt its properties to different operational conditions.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If dilatancy materials in liquid state are used, then flexibility is achieved, but bonding capability is lost

Engineering Contradiction:

ImproveflexibilityVSAvoidbonding capability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention creates a composite adhesive material combining a flexible adhesive base material with dilatant particles. This composite structure allows the adhesive to exhibit both the flexibility of liquid-like behavior under normal conditions and the bonding strength of solid-like behavior under impact, resolving the contradiction between flexibility and bonding capability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The adhesive's physical parameters (viscosity, modulus) are changed based on the loading rate. The dilatant particles cause the adhesive to exhibit shear-thickening behavior, where the effective viscosity and stiffness increase with increasing shear rate, enabling the adhesive to adapt its properties to different operational conditions.

Inventive Principle:

Principle #35Parameter changes

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 adhesive provides flexible bonding to prevent distortion and ensure waterproofness in electronic and optical components, while maintaining firmness to prevent damage upon impact, thus addressing the dual requirements of flexibility and stability.

Implementation Method 1

A dilatancy material in which particles are contained in liquid is known as a material exhibiting a property variable depending on a loading rate. The dilatancy (shear thickening) is a property of behaving like a liquid under a low-rate load and behaving like a solid under a high-rate load

Methodology Applied

Scientific EffectDilatancy (shear thickening): Dilatant

Data Source

PatentUS11643577B2Adhesive, electronic apparatus, and optical apparatus

Publication Date: 2023.05.09 SONY GROUP CORP

AI summary

To provide an adhesive suitable to bond a component of an electronic apparatus or an optical apparatus, as well as an electronic apparatus and an optical apparatus in which the adhesive is used. An adhesive according to an embodiment of the present technology includes a flexible adhesive material and a plurality of particles. The adhesive material is flexible. The plurality of particles is dispersed in the adhesive material, the plurality of particles being deformed under a low-rate load and not being deformed under a high-rate load.