Urethane Adhesive Viscosity Control via Anionic Dispersant

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Solution Overview

Problem

The existing resin compositions for battery modules face challenges in achieving excellent storage stability, processability, heat dissipation, adhesive force, cold resistance, heat resistance, and insulation, particularly due to issues with viscosity increase and curing rate when using fillers and dispersants.

Innovation Solution

A two-component urethane-based composition is developed, incorporating an anionic dispersant to control viscosity and ensure proper curing, with a filler distribution that maintains desired physical properties, including the use of ester-based polyols and thermally conductive fillers for enhanced adhesion and thermal conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If fillers are added to secure heat dissipation ability, then thermal conductivity is improved, but viscosity increases and processability deteriorates

Engineering Contradiction:

Improveheat dissipation abilityVSAvoidprocessability

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

A dispersant is introduced as an intermediary substance to mediate between the filler particles and the adhesive matrix. The dispersant adsorbs onto filler surfaces, providing steric or electrostatic repulsion that prevents agglomeration and reduces viscosity increase, thereby maintaining processability while preserving heat dissipation ability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes the dosage of dispersant as a controllable parameter to balance viscosity reduction and curing performance. By adjusting dispersant concentration within a specific range, the system achieves adequate flowability for injection while preventing excessive viscosity that would compromise processability

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If dispersants are added to control viscosity, then processability is improved, but curing rate may be affected

Engineering Contradiction:

ImproveprocessabilityVSAvoidcuring rate

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The dispersant acts as a temporary intermediary during the mixing and injection stages, controlling viscosity without interfering with the ultimate curing reaction. The dispersant's steric or electrostatic stabilization is maintained during storage and application, then gradually gives way to the curing process

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The dispersant performs preliminary action by pre-stabilizing the filler distribution and controlling viscosity during storage and injection. This preliminary stabilization ensures proper mixing and injection, after which the curing reaction proceeds to completion, achieving both processability and adequate curing rate

Inventive Principle:

Principle #10Preliminary action

3Temperature

If filler content is increased to enhance thermal conductivity, then heat dissipation is improved, but storage stability deteriorates due to viscosity increase

Engineering Contradiction:

Improvethermal conductivityVSAvoidstorage stability

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The dispersant serves as a stabilizing intermediary that prevents filler agglomeration and sedimentation during storage. By maintaining uniform dispersion through steric or electrostatic repulsion, the dispersant keeps viscosity at manageable levels even with high filler content, thereby preserving storage stability while enabling enhanced thermal conductivity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite adhesive system combining filler particles, dispersant, and adhesive matrix. This composite structure leverages the dispersant to maintain physical stability during storage while preserving the thermal conductivity benefits of high filler content, achieving a balance between storage stability and heat dissipation performance

Inventive Principle:

Principle #40Composite materials

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 composition achieves improved storage stability, curing rate, and physical properties, ensuring reliable adhesion, heat dissipation, and insulation in battery modules, while maintaining processability and reducing the risk of excessive viscosity and inadequate curing.

Implementation Method 1

incorporating an anionic dispersant to control viscosity

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

use of ester-based polyols and thermally conductive fillers for enhanced adhesion

Methodology Applied

Scientific EffectHydrogen bonding:

Implementation Method 3

thermally conductive fillers for enhanced adhesion and thermal conductivity

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11603451B2Resin composition

Publication Date: 2023.03.14 LG CHEM LTD

AI summary

The present application relates to an adhesive composition capable of fixing a battery cell in a battery module and a battery pack. According to one example of the present application, there is provided a two-component urethane-based adhesive composition which has excellent storage stability and processability and is capable of providing physical properties required in related uses in a short time.