UR-Type Polyimide Resin for High-Temperature Composite Structures
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Solution Overview
Problem
Conventional resins used in composite materials, such as car hoods and motorbike exhaust pipes, exhibit poor heat resistance and weatherability, leading to premature malfunction and failure, particularly under high temperatures.
Innovation Solution
A UR-type polyimide resin is synthesized through polymerization of dianhydride, diisocyanate, and diamine, which is applied in fiber fabric impregnation and metallic material coating processes, providing excellent heat resistance, mechanical, and electrical properties, and is characterized by high resilience and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional resins are used in composite materials for high-temperature applications, then the manufacturing cost and ease of processing are improved, but the heat resistance and weatherability deteriorate, leading to premature malfunction
Solution Approach 1:
The patent applies composite materials by combining polyimide resin with urea resin to create a UR-type polyimide resin composite. This composite structure integrates the high heat resistance of polyimide with the excellent adhesion and processability of urea resin, resolving the contradiction between ease of manufacture and heat resistance. The composite material maintains structural integrity at high temperatures while remaining manufacturable through conventional processing techniques.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition and molecular structure of the resin system. Specifically, it changes the resin type from conventional options to UR-type polyimide resin, altering key parameters such as thermal stability, glass transition temperature, and chemical composition. These parameter changes enable the material to withstand high temperatures and weathering conditions while maintaining manufacturability.
2Weight of moving object
If polyimide resin is used to replace metallic materials, then the weight is reduced and visual appeal is improved, but the adherence to fibers or metals and mechanical properties must be maintained
Solution Approach 1:
The UR-type polyimide resin uses composite materials combining polyimide and urea resin to achieve both weight reduction and maintained mechanical properties. The composite structure provides adequate adhesion to fibers and metals while keeping the material lightweight, thus resolving the contradiction between weight reduction and strength requirements for replacing metallic materials.
Solution Approach 2:
The patent applies local quality by optimizing specific regions or aspects of the resin system. The UR-type polyimide resin exhibits different properties in different contexts: it provides excellent adhesion when contacting metals or fibers, maintains high strength in structural applications, and achieves low weight in the overall composite. This localized optimization of properties allows the material to meet multiple conflicting requirements simultaneously.
3Reliability
If three-dimensional fiber fabric is used for reinforcement, then the delamination resistance and mechanical strength are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent uses composite materials (UR-type polyimide resin combined with three-dimensional fiber fabric) to achieve delamination resistance. The resin system is specifically formulated to work with 3D fiber architectures, providing adequate adhesion and structural integrity without requiring overly complex manufacturing processes. The composite material itself contributes to delamination resistance through its inherent bonding properties.
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 UR-type polyimide resin forms composites with enhanced heat resistance, mechanical strength, and chemical resistance, preventing delamination and offering wide applications in replacing metallic materials, including vehicle components, while maintaining visual appeal and reducing weight.
Implementation Method 1
The UR-type polyimide resin is synthesized by polymerization of three monomers, namely dianhydride, diisocyanate, and diamine
Implementation Method 2
a fiber fabric is impregnated with the UR-type polyimide resin in a liquid state
Implementation Method 3
a fiber fabric is impregnated with the UR-type polyimide resin in a liquid state
Implementation Method 4
the fiber fabric is heated and compressed to form a composite board
Implementation Method 5
the fiber fabric is heated and compressed to form a composite board
Implementation Method 6
a composite board produced from a three-dimensional woven fabric is free of a drawback, i.e., delamination, because the three-dimensional fiber fabric is fiber-reinforced in its thickness direction
Data Source
AI summary
A UR-type polyimide resin applicable to reinforced material structure is provided, essentially provided in the form of a UR-type (polyurea-imind, URI) polyimide resin (polyurea-imide resin), and synthesized by polymerization of three monomers, namely dianhydride, diisocyanate, and diamine. The UR-type polyimide resin thus synthesized is transparent, brownish, and highly viscous. Since its pyrolysis temperature is above 500° C., the UR-type polyimide resin is, together with a fiber material, used to produce a fiber composite or produce a metallic composite coated on or thinly adhered to the surface of a metallic material, allowing products of the disclosure to demonstrate excellent heat resistance, mechanical properties, electrical properties, and chemical properties.