Pre-fiber Gel Materials for Nylon-6 Fiber Processing
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Solution Overview
Problem
Current polymer processing methods, such as simple melt processing, have limitations in achieving molecular orientation and shape manipulation due to the brief period of solidification, restricting the molecular weights of polymers that can be used and making it difficult to produce high-strength fiber products like nylon-6, especially for applications beyond high-cost ballistic fibers.
Innovation Solution
A pre-fiber gel material composed of an amide-based or polyamide-based composition mixed with a lactam gelling agent, which provides sufficient viscosity and cohesiveness to be spun into fibers, allowing for processing by any method, including extrusion, and can be incorporated into fiber, yarn, or carpet products, with the gelling agent being removable post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple melt processing is used, then the polymer can be processed without solvent, but the molecular orientation and shape manipulation are limited due to brief solidification period
Solution Approach 1:
A gelating agent is introduced as an intermediary substance that forms a gel structure with the polymer during processing. This gel matrix acts as a temporary scaffold that maintains the polymer in a manipulable state for extended periods, enabling thorough molecular orientation and shape control before the gel breaks down and the polymer solidifies.
Solution Approach 2:
The invention changes the physical state parameters of the polymer by forming a gel structure. The gel state provides a non-Newtonian fluid behavior with extended processing time window, allowing the polymer to be processed at lower temperatures and for longer durations than in simple melt processing, thereby achieving better molecular orientation and shape manipulation.
2Manufacturing precision
If solvent gellation is used to extend processing time, then molecular orientation can be improved, but solvent removal and recovery present cost and equipment issues
Solution Approach 1:
The gelating agent is designed to be temporary and easily removable. It serves its purpose during processing by forming the gel structure, then can be removed through simple means such as evaporation or filtration without requiring complex solvent recovery systems. This eliminates the need for expensive solvent recovery equipment while still enabling extended processing time.
Solution Approach 2:
The gelating agent is extracted or removed from the final polymer product after processing. This extraction can be achieved through various methods depending on the specific gelating agent used, such as evaporation, filtration, or chemical decomposition, leaving the purified polymer without the need for complex recovery infrastructure.
3Ease of manufacture
If conventional solvents like formic acid are used for gel processing, then the polymer can be processed, but the solution viscosity is too low for processing
Solution Approach 1:
The invention changes the viscosity parameter of the polymer solution by forming a gel structure. The gelating agent interacts with the polymer chains to create a three-dimensional network that significantly increases the apparent viscosity of the solution, making it suitable for processing while maintaining the benefits of gel-state manipulation.
Solution Approach 2:
The invention creates a composite system consisting of the polymer and gelating agent. This composite gel structure provides the necessary viscosity and cohesiveness for processing, combining the properties of both components to achieve a processable material that would not exist in either component alone.
4Strength
If high molecular weight polymer is used to improve strength, then fiber durability increases, but the polymer becomes too viscous and cohesive to process
Solution Approach 1:
The gelating agent acts as a mediator that enables processing of high molecular weight polymers. It forms a gel structure that provides a non-Newtonian fluid behavior, reducing the effective viscosity during processing and allowing high molecular weight polymers to be manipulated without being too viscous or cohesive, while still achieving the desired strength properties.
Solution Approach 2:
The invention changes the flow and viscosity parameters of the polymer by forming a gel structure. This gel state provides a temporary reduction in effective viscosity, enabling the processing of high molecular weight polymers that would otherwise be too viscous, while maintaining the polymer's inherent strength properties in the final product.
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 enables the production of fibers with increased tensile strength and durability, allowing for higher molecular weight nylon-6 processing at lower temperatures, improved processibility, and cost-effective manufacturing with favorable industrial hygiene properties.
Implementation Method 1
A pre-fiber gel material composed of an amide-based or polyamide-based composition mixed with a lactam gelling agent, which provides sufficient viscosity and cohesiveness to be spun into fibers
Implementation Method 2
the gelling agent being removable post-processing
Data Source
AI summary
A pre-fiber gel material is described herein that includes: a) at least one amide-based and/or polyamide-based composition; and b) at least one lactam gelling agent, wherein the gel composition has sufficient viscosity and sufficient cohesiveness upon the mixing of the at least one amide-based or polyamide-based polymer and the at least one lactam gelling agent that the composition can be spun into a fiber. In addition, methods are provided herein that teach that the production of a pre-fiber gel composition, including: a) providing at least one amide-based compound; b) providing at least one lactam gelling agent; and c) mixing the at least one amide-based polymer and the at least one lactam gelling agent such that there is sufficient viscosity and sufficient cohesiveness in the composition so that it can be spun into a fiber.