Reactive Thermoplastic Composite Strands for Full Fiber Impregnation
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Solution Overview
Problem
Conventional methods for producing thermoplastic composites with continuous fibers face challenges such as high melt viscosities leading to incomplete resin impregnation, fiber breakage, and poor mechanical properties, while thermoset composites are difficult to repair and recycle due to their crosslinking nature.
Innovation Solution
The use of low-viscosity reactive thermoplastic resin compositions that can be melted and fully impregnate continuous fibers, followed by polymerization to form a thermoplastic matrix, enhancing mechanical properties like tensile strength and impact resistance, and allowing for recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional extrusion compounding is used to produce thermoplastic composites, then production efficiency is improved, but fibers are broken into very short lengths which limits mechanical properties
Solution Approach 1:
The process is divided into two distinct stages: first, extrusion compounding to create fiber-resin compositions with short fibers for high productivity; second, a separate molding process where these compositions are heated to melt the thermoplastic resin and form the final composite article. This segmentation allows each stage to be optimized independently - the extrusion stage maximizes production efficiency while the molding stage preserves fiber length and mechanical properties.
2Strength
If high melt viscosity thermoplastic resin is used, then material strength is improved, but resin impregnation of fibers becomes incomplete
Solution Approach 1:
The viscosity of the thermoplastic resin is dynamically controlled by changing the temperature parameter. During extrusion, the resin is processed at temperatures that maintain manageable viscosity for fiber mixing. During the subsequent molding process, the resin is heated to elevated temperatures to reduce viscosity and enable complete impregnation of the fibers, ensuring thorough resin distribution without compromising the final material strength.
3Ease of manufacture
If thermoset resin is used for fiber-reinforced articles, then ease of manufacture is improved, but repairability and recyclability deteriorate
Solution Approach 1:
The patent employs a thermoplastic resin that can be repeatedly softened and hardened by changing temperature parameters. This allows the composite articles to be manufactured with ease similar to thermosets, but also enables repair through local heating and welding, and recycling by melting and reprocessing. The key is the reversible parameter change (temperature-induced phase transition) that provides both manufacturing efficiency and end-of-life flexibility.
4Manufacturing precision
If low-viscosity reactive thermoplastic resin is used, then resin impregnation of fibers is improved, but polymerization must be controlled to maintain thermoplastic properties
Solution Approach 1:
The resin is formulated as a reactive thermoplastic resin in a preliminary state where it has low viscosity to ensure complete impregnation of fibers during the molding process. The polymerization reaction is then controlled to proceed to a specific degree, creating a semi-crystalline structure that maintains thermoplastic properties. This preliminary action of controlled polymerization allows the resin to achieve both good impregnation quality and retained thermoplastic characteristics for future processing and repair.
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 method results in thermoplastic composite articles with improved mechanical properties and the ability to recycle, reducing production costs and environmental impact by enabling the use of longer fibers and complete resin impregnation.
Implementation Method 1
melting a reactive thermoplastic resin to form a molten reactive resin
Implementation Method 2
polymerizing the molten reactive resin to form a thermoplastic matrix
Data Source
AI summary
Embodiments of the present technology may include a method of making a thermoplastic composite strand. The method may include melting a reactive thermoplastic resin to form a molten reactive resin. The method may also include fully impregnating a plurality of continuous fibers with the molten reactive resin in an impregnation device. The method may further include polymerizing the molten reactive resin to form a thermoplastic resin matrix. In addition, the method may include cooling the thermoplastic resin matrix to form a thermoplastic composite strand.