Epoxy Resin Flexibility via Acid-Terminated Polyester
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Solution Overview
Problem
Epoxy resins used in various applications lack sufficient flexibility, which is essential for characteristics like sealing performance, construction surface followability, and flex resistance.
Innovation Solution
An epoxy resin is developed by reacting an epoxy compound with an acid-terminated polyester, resulting in a product with improved flexibility, characterized by a specific molecular weight range and distribution, and suitable curing agents to enhance its properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polyalkylene glycol skeleton is introduced into the epoxy resin, then flexibility is expected to be improved, but the epoxy resin cannot provide sufficient flexibility
Solution Approach 1:
The patent changes the chemical structure parameter by replacing the polyalkylene glycol skeleton with a polyester structure containing specific chemical groups (carboxyl, hydroxyl, or ester groups). This structural parameter change enables the epoxy resin to achieve sufficient flexibility (passing the 180° bend test without cracking) while maintaining other required properties.
Solution Approach 2:
The patent creates a composite structure by combining epoxy compound (A) with acid-terminated polyester (B) having specific molecular weight characteristics (Mw/Mn ratio of 1.1 to 10.0). This composite approach, where the polyester acts as a flexible segment within the epoxy resin molecule, successfully provides the required flexibility that single-component epoxy resins cannot achieve.
2Ease of operation
If the molecular weight and molecular weight distribution are controlled within specific ranges, then flexibility is improved, but the synthesis complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the acid-terminated polyester (molecular weight 500-10,000 and Mw/Mn ratio 1.1-10.0) and the final epoxy resin (molecular weight 7,000-300,000 and Mw/Mn ratio 1.1-20.0). By controlling these parameters within defined ranges rather than optimizing individually, the synthesis process becomes more manageable while achieving the desired flexibility.
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 resulting epoxy resin and its composition exhibit excellent flexibility, making them suitable for applications in electric and electronic materials, fiber-reinforced resins, adhesives, and paints.
Implementation Method 1
an epoxy resin, which is a reaction product of an epoxy compound (A) and an acid-terminated polyester (B)
Data Source
AI summary
An object of the present invention is to provide an epoxy resin, an epoxy resin-containing composition, and a cured product which are excellent in flexibility. The present invention relates to an epoxy resin, which is a reaction product of an epoxy compound (A) and an acid-terminated polyester (B). In addition, the present invention relates to an epoxy resin-containing composition and a cured product obtained by using the epoxy resin.