Epoxy Adhesive Composition for Impact and Low-Temperature Strength
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Solution Overview
Problem
Epoxy resin-based adhesives used in the automotive industry lack sufficient impact strength and adhesion at low temperatures, such as -40°C, and do not maintain strength uniformly across a wide temperature range.
Innovation Solution
An adhesive composition comprising one or more epoxy resins, a modified epoxy resin with a polyether structure, core-shell rubber in secondary 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 for metal-metal or metal-plastic joining, then adhesion strength and heat resistance are improved, but impact strength and low-temperature adhesion are insufficient
Solution Approach 1:
The patent uses a composite adhesive system combining epoxy resin with polybutadiene-styrene-acrylonitrile (PBSA) copolymer and core-shell rubber particles. This composite formulation integrates the high strength and heat resistance of epoxy with the impact resistance and low-temperature flexibility of rubber modifiers, achieving uniform performance across -40°C to 80°C temperature ranges
Solution Approach 2:
The patent modifies the epoxy resin system by incorporating specific ratios of PBSA copolymer (5-20 parts by weight per 100 parts epoxy resin) and core-shell rubber (3-15 parts by weight per 100 parts epoxy resin), adjusting the chemical composition parameters to achieve optimal balance between adhesion strength, impact resistance, and low-temperature performance
2Strength
If epoxy resin-based adhesives are designed for high strength, then they lack uniform strength across wide temperature ranges (-40°C to 80°C)
Solution Approach 1:
The patent adjusts the glass transition temperatures of the adhesive components by selecting PBSA copolymer with Tg of -60°C to -40°C and core-shell rubber with Tg of -80°C to -50°C, ensuring the adhesive maintains flexible chain mobility and strong adhesion across the wide temperature range from -40°C to 80°C
Solution Approach 2:
The multi-component composite system combines epoxy resin (for high-temperature strength), PBSA copolymer (for low-temperature flexibility), and core-shell rubber (for impact resistance across temperatures), creating synergistic effects that maintain uniform strength properties throughout the operating temperature range
Data Source
Figure 1~2
AI summary
The present application relates to an epoxy-based adhesive composition. The present application can provide excellent adhesion strength, peel strength and impact-resistant strength uniformly over a wide temperature range.