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What are the differences between cationic dyeable polyester and easy cationic dyeable polyester?

2025-05-13

Molecular structure: Both are modified polyesters, but they have different monomer compositions. Cationic dyeable polyester is usually a ternary copolymer obtained by adding a third monomer (such as sodium dimethyl isophthalate - 5 - sulfonate) during the polycondensation of polyethylene terephthalate. ECDP is a quaternary copolymer, which is obtained by further adding a fourth monomer (such as polyethylene glycol, dimethyl isophthalate, adipic acid, 1,4 - butanedioic acid, etc.) on the basis of the ternary copolymer. The introduction of the fourth monomer in ECDP changes the molecular chain structure, making it more conducive to cationic dyeing.
Dyeing conditions: Cationic dyeable polyester generally needs to be dyed at a temperature of about 120°C or under pressure. In contrast, ECDP can be dyed under normal pressure and boiling conditions, that is, at about 100°C. This is because the molecular structure of ECDP is more open and loose, and the dye molecules are easier to penetrate into the fiber, so it can achieve good dyeing results at a lower temperature and pressure.
Dyeing effect: Both can be dyed with cationic dyes to obtain bright colors. However, due to the special molecular structure of ECDP, it has a higher color absorption rate and can show more vivid and deep colors. At the same time, the color fastness of ECDP is also relatively good, and it can maintain bright colors after multiple washes and usages.
Production process: The production of cationic dyeable polyester only requires the addition of a third monomer in the polymerization process. While the production of ECDP requires the addition of a fourth monomer on the basis of the third monomer, and the control of the polymerization process is more complex. For example, in the production of ECDP, the selection and dosage of the fourth monomer, as well as the reaction temperature, time and other parameters, need to be strictly controlled to ensure the performance of the product.
Performance and application: In addition to dyeing performance, ECDP has some other excellent properties. For example, it has better hygroscopicity and antistatic properties, and the fabric made of it is more comfortable to wear. These properties make ECDP more widely used in the textile industry, especially in the production of high - end clothing, home textiles and other products. Cationic dyeable polyester is also widely used, but in some fields where higher dyeing requirements and comfort are required, ECDP has more advantages.