Composite Curing via Exothermic Polymerization Front Control
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Solution Overview
Problem
Current methods for producing composite articles using fiber substrate materials with resin require high energy and expensive equipment for curing, necessitating the development of lower energy curing systems and methods.
Innovation Solution
A method and system involving unwinding, impregnation, winding, and solidification of fiber substrate materials with uncured resin composition, where heat is applied to initiate an exothermic reaction for polymerization and cross-linking, with monitoring and adjustment of parameters to maintain a consistent polymerization front velocity, allowing for efficient curing without continuous high heat application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional oven curing is used for composite articles, then complete resin curing is achieved, but high energy consumption and expensive equipment are required
Solution Approach 1:
The patent changes the curing parameters by using exothermic chemical reaction instead of external thermal heating. The resin system is modified to include reactive components that generate heat during polymerization, transforming the curing process from externally heat-driven to self-generated heat-driven, thereby reducing energy consumption while maintaining curing completeness
Solution Approach 2:
The resin composition is designed to generate its own curing heat through exothermic polymerization reaction. The resin system includes reactive monomers and oligomers that, when mixed with catalyst, undergo self-sustaining exothermic reaction to cure the composite without requiring external oven heating, making the system self-serving for the curing energy requirement
2Reliability
If high heat is applied continuously for curing, then resin polymerization is ensured, but energy costs increase and material integrity may be compromised
Solution Approach 1:
The curing process transitions from continuous external heating to periodic self-generated heat pulses through exothermic reaction. The polymerization reaction occurs in stages with heat generation naturally peaking and then subsiding as reactants are consumed, providing periodic thermal action that ensures complete polymerization without continuous energy input
Solution Approach 2:
The patent converts the potentially harmful uncontrolled exothermic reaction into a beneficial self-curing mechanism. By carefully selecting resin components with appropriate reaction kinetics, the exothermic heat that could cause defects is harnessed to drive complete polymerization, transforming a risk into a benefit that reduces energy costs while ensuring curing completion
3Reliability
If traditional curing equipment is used, then resin solidification is achieved, but expensive equipment is required
Solution Approach 1:
The resin system is formulated to perform its own curing function without external equipment assistance. The inclusion of self-curing chemical components allows the resin to solidify through internal exothermic polymerization, eliminating the need for expensive oven equipment and simplifying the manufacturing setup while ensuring reliable resin solidification
Solution Approach 2:
The patent replaces the mechanical/thermal curing system (oven heating) with a chemical self-curing system. Instead of using external thermal energy from equipment, the curing is achieved through chemical reaction inherent to the resin composition, substituting a complex mechanical thermal system with a simpler chemical process
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
This approach reduces energy consumption and costs by utilizing self-propagating exothermic reactions for curing, enabling the production of composite articles with lower energy input while maintaining the quality and integrity of the material.
Implementation Method 1
applying heat indirectly or directly to the resin-fiber material to initiate an exothermic reaction including polymerization, cross-linking, or both of the uncured resin composition
Implementation Method 2
initiate an exothermic reaction including polymerization, cross-linking, or both of the uncured resin composition
Implementation Method 3
determining a polymerization front velocity set point (vpfs) and an operating polymerization front velocity (vpfo)
Data Source
AI summary
Methods of making a composite article are provided herein. The method can include an unwinding step including unwinding a fiber substrate material from a creel at an unwinding velocity and an impregnation step including applying an uncured resin composition to the fiber substrate material to form a resin-fiber material. The method further includes a winding step comprising applying the resin-fiber material onto a shaped surface at a winding velocity and a solidifying step comprising applying heat to the resin-fiber material to initiate an exothermic reaction comprising polymerization, cross-linking, or both of the uncured resin composition. Temperature of the resin-fiber material can be monitored during operation of the method and a polymerization front velocity set point (vpfs) and an operating polymerization front velocity (vpfo) can be determined. Parameters can be adjusted to maintain a vpfo that is substantially the same as the vpfs. Systems for performing said methods are also provided.