Polyamide Composite Thermal Aging Resistance via PEI Surface Layer
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Solution Overview
Problem
Fiber-reinforced plastic composite components lack satisfactory thermal aging resistance, which affects their mechanical properties and longevity when exposed to elevated temperatures, despite previous attempts to improve thermal aging stability using copper-based stabilizers and polyhydric alcohols.
Innovation Solution
A plastic composite component comprising a polyamide matrix polymer reinforced with fibers, where the surface composition includes polyethyleneimine (PEI) to enhance thermal aging resistance, while the matrix composition does not necessarily contain PEI, allowing for cost-effective production and improved adhesion between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper-based stabilizers and polyhydric alcohols are used to improve thermal aging stability, then thermal aging resistance is improved, but production cost increases and adhesion between components deteriorates
Solution Approach 1:
The patent removes copper-based stabilizers and polyhydric alcohols from the composition entirely, replacing them with polyethyleneimine (PEI) as a single alternative additive. This extraction of harmful or costly substances while maintaining the thermal aging protection function resolves the contradiction between reliability and manufacturing ease.
Solution Approach 2:
The patent changes the chemical parameter of the thermal stabilizer from copper-based compounds to polyethyleneimine, fundamentally altering the chemical composition to achieve both cost reduction and improved adhesion while maintaining thermal aging resistance. This parameter change enables a single substance to fulfill multiple functions.
2Reliability
If PEI is added to both surface composition and matrix composition, then thermal aging resistance is maximized, but production cost increases
Solution Approach 1:
The patent applies PEI selectively only to the surface composition rather than uniformly throughout the entire composite material. This localized application provides thermal aging protection where it is most needed (at the surface exposed to environmental conditions) while reducing the overall quantity of PEI required, thereby lowering production costs.
3Strength
If fiber-reinforced plastics are used to reduce weight and cost, then mechanical properties improve, but thermal aging resistance deteriorates
Solution Approach 1:
The patent creates a composite formulation by combining fiber-reinforced plastic with polyethyleneimine in the surface composition. This composite approach allows the material to simultaneously achieve good mechanical properties from the fiber reinforcement and improved thermal aging resistance from the PEI additive, resolving the contradiction between these two performance aspects.
Data Source
AI summary
The present invention relates to a process for producing a plastic composite component (CC) in which a first fiber material (F1) is impregnated with a polyamide matrix polymer (PAM) to obtain a matrix composition (MC), to which a surface composition (SC) is applied, and a first plastic component (C1) is obtained. In a second step, a second plastic component (C2) is molded onto the first plastic component (C1), giving the plastic composite component (CC). The invention further relates to the plastic composite component (CC) obtainable by the process of the invention. The present invention further provides for the use of polyethyleneimine (PEI) for improving the impregnation of the first fiber material (F1) with the polyamide matrix polymer (PAM).