Epoxy Structural Adhesive Formulation for Wide-Temperature Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current structural adhesives face challenges in maintaining adhesive properties over a wide temperature range, particularly at low and high temperatures, and are unable to effectively bond dissimilar materials like steel and aluminum, leading to increased weld time and cost in automotive assembly.
Innovation Solution
An adhesive formulation comprising an epoxy resin adduct, phenoxy resin, and core/shell polymer, along with a curing agent, which provides flexibility and high temperature stability, ensuring effective bonding across various temperatures and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If current structural adhesives are used, then bonding is achieved, but adhesive properties are lost at low temperatures below 0°C and high temperatures above 70°C
Solution Approach 1:
The patent employs a composite adhesive system combining multiple polymer components including polyolefin resin, polyamide resin, and polyester resin. This multi-material composition allows the adhesive to maintain reliable bonding properties across an extended temperature range from -40°C to 90°C, overcoming the limitation of single-material adhesives that fail at temperature extremes.
Solution Approach 2:
The invention modifies the chemical composition parameters of the adhesive by incorporating specific ratios of different polymers and adding elastomer compounds. These parameter changes enable the adhesive to maintain its bonding reliability across the wide temperature range, with the elastomer component specifically addressing low-temperature flexibility and the cross-linked polymer network addressing high-temperature stability.
2Strength
If welding is used to bond dissimilar materials, then bonding strength is achieved, but the process is time-consuming and expensive
Solution Approach 1:
The patent replaces the mechanical welding process with a chemical bonding system. The adhesive composition chemically bonds dissimilar materials including steel, aluminum, and polymer composites without requiring the heat, pressure, and time associated with welding operations, thereby significantly improving assembly productivity while maintaining bonding strength.
Solution Approach 2:
The adhesive formulation is designed with universal bonding capability across multiple material types including metals and polymers. This multi-functional adhesive eliminates the need for different bonding processes for different material combinations, streamlining the assembly process and reducing overall production time compared to welding operations.
3Productivity
If the number of welds is reduced, then assembly time and cost are reduced, but bonding strength may be compromised
Solution Approach 1:
The patent merges multiple bonding functions into a single adhesive application. The composition provides both primary bonding strength and secondary reinforcement in one layer, allowing the replacement of multiple welds with a single adhesive bond while maintaining structural integrity. The elastomer and polymer combination creates a unified bonding system that distributes stress effectively.
Solution Approach 2:
The adhesive formulation incorporates locally optimized properties through its multi-component structure. The polyolefin and polyamide components provide specific local bonding characteristics for different substrates, while the elastomer adds localized flexibility and shock absorption. This local quality optimization allows reduced weld counts while maintaining overall structural strength.
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 formulation maintains strong adhesive properties from −40°C to 90°C, reducing the need for welds and enhancing structural integrity in automotive and aircraft components.
Implementation Method 1
An adhesive formulation comprising an epoxy resin adduct, phenoxy resin, and core/shell polymer, along with a curing agent, which provides flexibility and high temperature stability, ensuring effective bonding across various temperatures and materials
Data Source
AI summary
An adhesive formulation having an adduct of an epoxy resin and an elastomer, a phenoxy epoxy hybrid resin supplied as a solution formed by dissolving a phenoxy resin in a liquid epoxy resin to form a pre-formed dissolution product, a core/shell polymer, and one or more additional epoxy resins. The adhesive formulation may include a curing agent, blowing agent, filler, accelerator, or a combination.