Polyamide Particle Prepreg for Aircraft Composite CAI
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Solution Overview
Problem
Fiber-reinforced composite materials for aircraft applications face challenges in achieving high compressive strength after impact (CAI) and flexural modulus while maintaining high glass transition temperature and weight reduction, particularly when using benzoxazine resins.
Innovation Solution
A prepreg comprising a reinforcing fiber layer impregnated with a resin composition containing benzoxazine, epoxy, and a curing agent with phenolic hydroxy groups, along with a surface layer containing polyamide resin particles, which improves CAI and flexural modulus by controlling the melting temperature of polyamide particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If benzoxazine resin is used to achieve high glass transition temperature and moisture resistance, then heat resistance and moisture resistance are improved, but toughness and CAI (compressive strength after impact) deteriorate
Solution Approach 1:
The patent uses a composite resin system combining benzoxazine resin with epoxy resin and polyamide resin particles. The benzoxazine resin provides high glass transition temperature and moisture resistance, while the epoxy resin and polyamide particles contribute to improved toughness and CAI. This composite approach allows simultaneous achievement of heat resistance and impact resistance that cannot be obtained with benzoxazine resin alone.
2Strength
If more resin is added to improve toughness and CAI, then CAI and toughness are improved, but weight increases
Solution Approach 1:
The patent optimizes the resin composition parameters by selecting specific types of epoxy resin and polyamide resin particles with controlled particle sizes (5-50 μm). By adjusting the chemical composition and physical parameters of the resin system rather than simply increasing resin quantity, the patent achieves improved CAI and toughness while controlling weight through efficient material utilization.
3Strength
If polyamide resin particles with low melting temperature are used to improve CAI, then CAI and toughness are improved, but polyamide particles may melt and enter fiber layer during curing, affecting quality
Solution Approach 1:
The patent carefully selects polyamide resin particles with specific melting points that balance two requirements: low enough to provide toughness improvement through controlled melting and dispersion, but high enough to prevent excessive melting and contamination of the fiber layer during the curing process. This parameter optimization resolves the contradiction between achieving improved CAI through polyamide particle melting while maintaining fiber layer quality.
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 solution enables the production of fiber-reinforced composite materials with enhanced CAI, flexural modulus, and maintained glass transition temperature, suitable for aircraft and other industrial uses, while reducing material weight.
Implementation Method 1
A decrease in the melting temperature of the polyamide resin particles occurs due to the presence of the compound having phenolic hydroxy groups that is the curing agent of (A) the benzoxazine resin
Implementation Method 2
by using the specific polyamide resin particles mentioned above, a state where it is difficult for the polyamide resin particles to flow can be created and consequently the effects of improving the CAI and the flexural modulus have been able to be obtained sufficiently
Data Source
AI summary
A prepreg 10 comprises: a reinforcing fiber layer 3 including reinforcing fibers 1 and a resin composition 2 with which the space between fibers of the reinforcing fibers is impregnated and which contains (A) a benzoxazine resin, (B) an epoxy resin, and (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule; and surface layers 6a and 6b provided on the surfaces of the reinforcing fiber layer 3 and containing (A) a benzoxazine resin, (B) an epoxy resin, (C) a curing agent having 2 or more phenolic hydroxy groups in a molecule, and (D) polyamide resin particles 4 having an average particle size of 5 to 50 μm, wherein the polyamide resin particles 4 include the polyamide 1010 resin particle.