Low chromatic aberration polyester different-shrinkage composite yarn
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Solution Overview
Problem
Polyester fibers face challenges in dyeing due to the presence of oligomers, which cause color spots, stains, and difficulties in dyeing and finishing processes, primarily because of their low hydrophilicity and the migration of oligomers during high-temperature dyeing, leading to poor dyeing efficiency and fabric quality.
Innovation Solution
A low chromatic aberration polyester different-shrinkage composite yarn is developed 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 130° C. with water and a rinsing agent to minimize oligomer content, thereby improving dyeing and post-processing outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature high-pressure dyeing method is used to dye polyester fiber, then dye molecules can penetrate into the fiber interior, but oligomers migrate and crystallize on the fiber surface causing color spots and stains
Solution Approach 1:
The patent applies preliminary action by brewing and washing polyester chips before spinning to remove oligomers in advance. The chips are treated with water and solvent under controlled temperature (120-130°C) and pressure (0.2-0.3 MPa) conditions, which dissolves and removes oligomers before they can cause problems during subsequent high-temperature dyeing processes.
Solution Approach 2:
The patent changes process parameters by controlling the brewing and washing conditions at 120-130°C and 0.2-0.3 MPa, which is lower than traditional dyeing temperatures. This parameter change allows oligomer removal while preventing their crystallization and deposition on fiber surfaces during the treatment process.
2Productivity
If conventional polycondensation catalyst is used, then polyester production efficiency is improved, but thermal degradation increases and oligomer content rises
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst system by using a mixture of magnesium ethylene glycol and antimony ethylene glycol instead of conventional single catalysts. This compositional change maintains high polycondensation efficiency while reducing thermal degradation and oligomer formation during polyester production.
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 solution results in a yarn with reduced oligomer content, improved dyeing performance, and enhanced fabric quality, characterized by high breaking strength, low color difference, and excellent shading and dyeing performance, while minimizing the appearance of stains and ensuring fiber leveling and rubbing fastness.
Implementation Method 1
the polyester chips are washed at 130° C. with water and a rinsing agent to minimize oligomer content
Implementation Method 2
a polycondensation catalyst which adopts a mixture of magnesium ethylene glycol and antimony ethylene glycol and the polyester chips which are brewed and washed
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.