Aromatic Polyamide Filament Manufacturing via Alternating Feed Paths
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Solution Overview
Problem
Conventional methods for manufacturing wholly aromatic polyamide filaments result in non-uniform polymerization, leading to deviations in degree of polymerization, which deteriorate the physical properties such as strength and modulus of the final product.
Innovation Solution
A process involving a multiple tubular feed pipe with alternating inner and outer paths is used to feed aromatic diacid chloride and diamine into a polymerization reactor, ensuring uniform and homogeneous polymerization by creating a vortex and regulating velocities, resulting in a polymer with narrow Polydispersity Index (PDI) and large apparent crystal size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aromatic diacid chloride and aromatic diamine are introduced through separate feed pipes into the polymerization reactor, then the feeding process is simple, but the monomers do not mingle well immediately, causing non-uniform polymerization and increased deviation in degree of polymerization
Solution Approach 1:
The patent combines multiple feed streams (aromatic diacid chloride and aromatic diamine solutions) into a single common feed pipe with alternating inner and outer paths. This merging allows the monomers to mingle immediately upon mixing in the reactor, ensuring uniform polymerization while maintaining simple feeding operation through integrated pipe design
Solution Approach 2:
The feed pipe is segmented into alternating inner and outer paths that carry different monomer solutions. This segmentation allows controlled mixing zones where monomers are introduced separately but mingle systematically, resolving the contradiction between simple feeding and uniform mixing
2Device complexity
If conventional separate feed pipes are used, then device complexity is low, but deviation in degree of polymerization increases, deteriorating filament strength and modulus
Solution Approach 1:
Multiple feed streams are merged into a common feed pipe with alternating inner and outer paths, creating immediate and uniform mixing of monomers. This merging structure, while slightly more complex than separate pipes, ensures uniform polymerization that directly improves filament strength and modulus by minimizing degree of polymerization deviation
3Productivity
If monomers are not uniformly polymerized, then polymerization process is simpler, but physical properties of filament are deteriorated
Solution Approach 1:
The feed pipe structure is designed to preliminarily mix monomers through alternating inner and outer paths before they enter the main polymerization zone. This preliminary mixing action ensures uniform distribution of monomers, enabling both efficient polymerization process and reliable filament physical properties
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 minimizes deviation in polymerization, leading to wholly aromatic polyamide filaments with significantly improved strength and modulus, characterized by a PDI range of 1.5 to 2.3 and apparent crystal size of 42 to 50Å, resulting in enhanced mechanical properties.
Implementation Method 1
ensuring uniform and homogeneous polymerization by creating a vortex and regulating velocities
Data Source
Figure 1~3
Figure 4~5
AI summary
Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized in that, in a process of preparing wholly aromatic polyamide polymer, a multiple tubular feed pipe for polymeric monomer and polymerization solvent with specific construction of adjacent inner paths and outer paths which are alternately arranged one another is used to feed either aromatic diacid chloride A or aromatic diamine dissolved in the polymerization solvent B into a polymerization reactor (20) through corresponding one among the inner and outer paths. The present invention is effective to progress uniform and homogeneous polymerization over all of area of a polymerization reactor (20) leading to reduction of deviation in degree of polymerization, since polymeric monomers are miscible and react together very well immediately after putting the monomers into the reactor (20). Accordingly, the wholly aromatic polyamide filament produced exhibits narrow PDI and increased ACS, so as to considerably improve strength and modulus thereof.