Low-colour-difference polyester differential shrinkage composite yarn and preparation method therefor
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Solution Overview
Problem
Polyester fibers face challenges in dyeing due to the presence of oligomers, which cause chromatic aberration, staining, and poor dyeing performance, primarily because of their low hydrophilicity and the difficulty in removing cyclic oligomers and diethylene glycol, leading to issues in dye diffusion and fiber surface deposition.
Innovation Solution
A low chromatic aberration polyester different-shrinkage composite yarn is prepared using a mixture of magnesium ethylene glycol and antimony ethylene glycol as a polycondensation catalyst, reducing thermal degradation and oligomer production, and the polyester chips are washed at 120-130 °C and 0.2-0.3 MPa with water and a rinsing agent to minimize oligomer content, thereby improving dyeing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyester fiber is dyed using conventional high-temperature high-pressure method, then dye penetration is achieved, but chromatic aberration and staining occur due to oligomer deposition on fiber surface
Solution Approach 1:
The patent applies preliminary action by washing polyester chips before spinning to remove oligomers in advance. The washing process uses water and a rinsing agent at 120-130°C and 0.2-0.3MPa to eliminate cyclic oligomers and diethylene glycol from the fiber surface before dyeing occurs, preventing subsequent chromatic aberration and staining issues during the dyeing process
Solution Approach 2:
The patent changes physical parameters by controlling washing temperature at 120-130°C and pressure at 0.2-0.3MPa. These parameter changes optimize the removal of oligomers while preventing fiber damage, achieving effective oligomer elimination that improves dyeing uniformity and reduces chromatic aberration
2Quantity of substance
If polyester chips are washed at high temperature and pressure to remove oligomers, then oligomer content is reduced, but energy consumption and process complexity increase
Solution Approach 1:
The patent optimizes washing parameters to 120-130°C and 0.2-0.3MPa, which are moderate conditions that effectively remove oligomers without requiring excessive energy input. This parameter optimization achieves effective oligomer reduction while controlling energy consumption and process complexity
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 a yarn with reduced oligomer content, improved dyeing efficiency, and enhanced fiber quality, minimizing chromatic aberration and surface defects, ensuring better dye penetration and fastness, while maintaining high strength and softness.
Implementation Method 1
the polyester chips are washed after the polyester obtained
Implementation Method 2
reducing thermal degradation and oligomer production
Data Source
AI summary
A low chromatic aberration polyester different-shrinkage composite yarn is made of polyester POY yarn and polyester FDY composite yarn. The polyester POY yarn and polyester FDY yarn is obtained by spinning the polyester solution, the rupture strength of the low color polyester different-shrinkage composite yarn is ≥1.9 cN / dtex, the elongation at break is 30.0 ± 5.0%, the crimp shrinkage is 2.50 ± 3.0%, the network degree is 20 ± 5 / m, the color difference ΔE is less than 0.200. In the invention, the magnesium ethylene glycol is relatively mild, the thermal degradation coefficient is small, the oligomers in the polymerization process is reduced, and the oligomers in the dissolution process are further reduced, so that the appearance of stains and streaks reduces during the dyeing and post-processing heat setting of the polyester fiber, which ensures the fiber's leveling and rubbing fastness.