Epoxy Adhesives Low Viscosity Aromatic Formulation

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Solution Overview

Problem

Two-part epoxy adhesives used in the automotive industry face challenges with high viscosity at low temperatures, making application impossible without heating, and existing solutions that reduce viscosity compromise the glass transition temperature.

Innovation Solution

Incorporating a di-functional aromatic epoxy compound, such as 1,4-divinylbenzene dioxide, along with a polyphenolic blocked polyurethane and core-shell rubber epoxy dispersion in the resin composition, which maintains low viscosity and high glass transition temperature, allowing for application at lower temperatures while preserving mechanical strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If aliphatic diluents are added to lower viscosity, then viscosity decreases, but glass transition temperature drops

Engineering Contradiction:

Improveglass transition temperatureVSAvoidviscosity

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The patent changes the chemical structure parameter of the epoxy compound from aliphatic to aromatic (specifically using 1,4-divinylbenzene dioxide), which fundamentally alters the molecular properties to achieve low viscosity without the detrimental effect on glass transition temperature that characterizes aliphatic diluents

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite epoxy system by combining aromatic epoxy compound (1,4-divinylbenzene dioxide) with polyphenolic blocked polyurethane and core-shell rubber epoxy dispersion, achieving synergistic effects that simultaneously provide low viscosity and high glass transition temperature

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If heating is applied to reduce viscosity for application, then viscosity decreases, but additional energy consumption and process complexity increase

Engineering Contradiction:

ImproveviscosityVSAvoidenergy consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent changes the intrinsic viscosity parameter of the epoxy formulation by selecting aromatic epoxy compounds with specific molecular structures that naturally exhibit low viscosity across a wide temperature range, eliminating the need for thermal processing to achieve application-ready viscosity

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If more aliphatic diluents are added to achieve acceptable viscosity, then viscosity decreases, but mechanical strength deteriorates

Engineering Contradiction:

ImproveviscosityVSAvoidmechanical strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent changes the chemical composition parameter from aliphatic to aromatic epoxy compounds, which maintain robust mechanical strength characteristics while providing adequate viscosity reduction, thus preserving the structural integrity of the cured adhesive

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention combines aromatic epoxy compound with polyphenolic blocked polyurethane and core-shell rubber epoxy dispersion to create a composite system where each component contributes to both processing characteristics and mechanical performance, achieving low viscosity without compromising strength

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS10190028B2Epoxy two-part formulations

Publication Date: 2019.01.29 DDP SPECIALTY ELECTRONICS MATERIALS US LLC

AI summary

The invention relates to resin compositions for epoxy adhesives, comprising a di-functional aromatic epoxy compound. The resin compositions and/or uncured adhesive compositions having low viscosity at low temperatures. Adhesives made therefrom have good strength and bulk properties. The invention includes methods of making and using the compositions, as well as adhesives made from the compositions.