UHMWPE Spinning Solution Mixing for Viscosity Control
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Solution Overview
Problem
Existing methods for preparing ultra-high molecular weight polyethylene fiber spinning solutions face challenges in achieving high solid content and homogeneous solutions, leading to issues such as nonhomogeneity and low spinning efficiency, which affect the mechanical properties of the fibers.
Innovation Solution
A method involving mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution at specific weight ratios to create a spinning solution with 10-15% solid content, using a solvent mixture of cyclane and alkane, and controlling temperature and stirring conditions to ensure proper fluidity and chain entanglement density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the molecular weight of the raw material or the density of the spinning solution is increased to increase chain entanglement density, then the drawing capacity of the gel filament is improved, but the polymer particles become difficult to dissolve thoroughly and caking occurs, causing nonhomogeneity in the spinning solution
Solution Approach 1:
The dissolution process is divided into multiple stages: initial dissolution at lower concentration, then incremental addition of polymer particles. This segmentation allows thorough dissolution at each stage before adding more material, preventing caking and nonhomogeneity while achieving high final concentration and entanglement density.
Solution Approach 2:
The patent performs preliminary dissolution of polymer particles in solvent before reaching the target high concentration. By establishing a homogeneous base solution first and then incrementally adding more polymer, the system ensures complete dissolution and homogeneity is maintained throughout the process, avoiding caking that would occur if high concentration were attempted directly.
2Strength
If the solid content of the spinning solution is increased to increase chain entanglement density, then the drawing capacity is improved, but the viscosity increases dramatically and the weissenberg effect occurs, influencing smooth spinning
Solution Approach 1:
The patent employs dynamic adjustment of processing parameters during the dissolution process. Temperature, stirring speed, and addition rate are dynamically optimized to maintain solution homogeneity and appropriate viscosity throughout the incremental concentration process, preventing the weissenberg effect and ensuring smooth spinning operations.
Solution Approach 2:
The patent systematically changes physical parameters (temperature, concentration, stirring conditions) during the dissolution process. By controlling temperature and adding polymer incrementally with appropriate stirring, the system achieves high solid content without excessive viscosity buildup, maintaining spinability and preventing the weissenberg effect.
3Stability of the object's composition
If stepwise swelling is used to prepare homogeneous spinning solution, then homogeneity is improved, but the viscosity increases dramatically during dissolution and the weissenberg effect occurs
Solution Approach 1:
The patent maintains continuous dissolution action throughout the process by incremental addition of polymer particles with continuous stirring. This continuous action prevents localized concentration gradients and the weissenberg effect, achieving both homogeneity and smooth spinning by avoiding discontinuous processing steps.
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 produces a stable spinning solution with improved fluidity and continuity, preventing filament breakage and ensuring consistent high-strength ultra-high molecular weight polyethylene fibers with low coefficient of variability in mechanical properties.
Implementation Method 1
mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution of ultra-high molecular weight polyethylene
Implementation Method 2
swollen solution of ultra-high molecular weight polyethylene
Data Source
AI summary
Provided is a method for preparing a spinning solution of ultra-high molecular weight polyethylene fiber, which comprises mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution of ultra-high molecular weight polyethylene at a weight ratio of 0.42~2.85, to obtain a spinning solution with a content of the ultra-high molecular weight polyethylene being 10%~15% by weight; the content of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene is 10%~50% by weight; and the weight ratio of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene to the ultra-high molecular weight polyethylene in the dissolved solution of ultra-high molecular weight polyethylene is 2.5~70. Since the dissolved solution functions to plasticize the swollen solution, the problem of high viscosity of the spinning solution is well addressed, thus ensuring that the spinning solution has a good fluidity and spinning continuity, and avoiding broken filament and filament breakage from occurring in the subsequent spinning process, so as to prepare ultra-high molecular weight polyethylene fiber with good performance.