Epoxy Adhesive Composition for Wide Temperature Strength
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Solution Overview
Problem
Epoxy resin-based adhesives used in the automotive industry lack sufficient strength at low temperatures, such as −40°C, and fail to maintain adhesion and impact resistance across a wide temperature range.
Innovation Solution
An adhesive composition comprising a combination of epoxy resins, urethane resins with a polyether structure, core-shell rubber particles, and an epoxy curing agent, which provides excellent adhesion, impact, and shear strength from −40°C to 80°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin-based adhesives are used to achieve high heat resistance and excellent adhesion strength, then adhesion strength is improved, but low-temperature strength (at −40°C) is insufficient
Solution Approach 1:
The patent uses a composite adhesive system combining epoxy resin with polyamide resin and rubber particles. The epoxy resin provides high heat resistance and adhesion strength, while the polyamide resin and rubber particles improve low-temperature flexibility and strength. This composite approach allows the adhesive to maintain excellent performance across a wide temperature range from −40°C to 80°C.
Solution Approach 2:
The patent adjusts the molecular weight and glass transition temperature parameters of the polyamide resin and rubber particles to optimize low-temperature performance. By controlling the glass transition temperature of the rubber particles to be below −40°C, the adhesive maintains flexibility and strength at low temperatures while retaining the high-temperature performance of the epoxy resin matrix.
2Temperature
If epoxy resin-based adhesives are used to achieve high heat resistance, then heat resistance is improved, but impact-resistant strength at low temperatures deteriorates
Solution Approach 1:
The patent creates a composite system where epoxy resin provides heat resistance up to 80°C, while polyamide resin and rubber particles contribute to impact resistance. The rubber particles act as impact absorbers, dissipating energy during impact events, especially at low temperatures where the epoxy resin alone would be too brittle.
Solution Approach 2:
The patent introduces rubber particles with specific local properties (low glass transition temperature, high elasticity) into the epoxy resin matrix. These rubber particles create localized regions of flexibility and energy absorption within the adhesive, allowing the overall structure to withstand impact at low temperatures while maintaining the heat resistance of the epoxy matrix.
3Strength
If epoxy resin-based adhesives are used to maintain adhesion strength, then adhesion strength is improved, but adhesion strength at low temperatures deteriorates
Solution Approach 1:
The patent combines epoxy resin with polyamide resin and rubber particles to create an adhesive that maintains strong adhesion at both high and low temperatures. The polyamide resin enhances adhesion to metal substrates, while the rubber particles prevent brittleness at low temperatures, ensuring consistent adhesion performance from −40°C to 80°C.
Solution Approach 2:
The patent modifies the thermal and mechanical parameters of the adhesive formulation by adjusting the ratio of epoxy resin to polyamide resin and controlling the glass transition temperature of the rubber particles. This parameter optimization ensures that the adhesive maintains sufficient flexibility and bonding strength at low temperatures while retaining high-temperature adhesion performance.
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 ensures uniform and enhanced adhesion, impact, and shear strength across a wide temperature range, addressing the limitations of existing epoxy resin-based adhesives.
Implementation Method 1
an adhesive composition comprising (a) one or more epoxy resins, (b) a urethane resin having a polyether structure, (c) a core-shell rubber in the form of secondary particles in which two or more core-shell rubbers in the form of primary particles are aggregated and (d) one or more epoxy curing agents
Data Source
AI summary
An epoxy-based adhesive composition and methods for manufacturing the same are provided. The adhesive composition provides excellent adhesion strength, peel strength and impact-resistant strength uniformly over a wide temperature range.