Polyester Copolymer Oligomer Remover for Acidic Polyester Dyeing
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Solution Overview
Problem
Polyester-based fiber materials face issues with oligomer deposition during dyeing, leading to shadow spots, calender contamination, powder generation, and yarn breakage, which existing oligomer removing agents fail to adequately address, especially in acidic baths.
Innovation Solution
A polyester copolymer oligomer removing agent is developed through polycondensation of a dibasic acid component with 15-65 mol % sulfonate group-containing dibasic acid and a dihydric alcohol component containing polyethylene glycol with a molecular weight of 900-3500, resulting in a 200° C. melt viscosity of 5000-23,000 mPa·s and 10-40 mass % polyoxyethylene chain content, enhancing affinity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oligomer removing agents (sulfonic acid salt of polyoxyethylenestyryl phenyl ether, carboxyl group-containing polymers, or ester of polyhydric alcohol-alkylene oxide addition product) are added to the dyeing bath, then oligomer removal is attempted, but the polyester oligomer removing effect is low and satisfactory removal cannot be achieved, especially with acidic baths
Solution Approach 1:
The invention changes the chemical parameters of the oligomer removing agent by incorporating sulfonate groups and polyethylene glycol chains with specific molecular weights (900-3500) and specific content (10-40 mass%). This modification enables the agent to effectively remove oligomers in acidic dyeing baths where conventional agents fail, thus improving both reliability and adaptability to different bath conditions
Solution Approach 2:
The invention uses a composite polymer structure combining sulfonate group-containing components with polyethylene glycol chains. This composite structure provides both the affinity for polyester oligomers (through polyethylene glycol) and the stability in acidic conditions (through sulfonate groups), resolving the contradiction between effective removal and effectiveness in acidic environments
2Object-affected harmful factors
If oligomer removing agents are added to prevent oligomer deposition, then shadow spots and calender contamination are prevented, but the oligomers can still redeposit on fiber material or dyeing machine
Solution Approach 1:
The sulfonate-containing polyester copolymer acts as an intermediary substance that binds to polyester oligomers and keeps them stabilized in the dyeing bath. This intermediary agent prevents both deposition on fabric (shadow spots) and redeposition on fiber material or dyeing machine surfaces, addressing both harmful factors simultaneously
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 agent effectively removes oligomers from polyester-based fiber materials, minimizing redeposition and ensuring efficient dyeing processes with reduced foaming and processing defects, maintaining dye dispersibility and handling suitability.
Implementation Method 1
Because the oligomer removing agent of the invention is polyester copolymer-based, it has high affinity with polyester oligomers and allows oligomers to be stably maintained in water
Implementation Method 2
Moreover, since the oligomer removing agent of the invention contains a sulfonate group, the oligomers do not become redeposited on the fiber material or dyeing machine
Data Source
AI summary
An oligomer removing agent for polyester-based fiber materials comprises a polyester copolymer which is obtained by polycondensation of a dibasic acid component containing 15-65 mol % of a sulfonate group-containing dibasic acid and a dihydric alcohol component containing polyethylene glycol with a molecular weight of 900-3500, and which has a 200° C. melt viscosity of 5000-23,000 mPa·s and has 10-40 mass % polyoxyethylene chains in the molecule. The oligomer removing agent is able to overcome the problems caused by deposition of polyester oligomers, when added to the dyeing bath in a dyeing step for polyester fiber materials or for fiber materials that are composites thereof with other fiber materials.