The dyeing effects of polyester and nylon can be distinguished by the following aspects:
1. Dyeing method:
Polyester is usually dyed with disperse dyes. Because the molecular structure of polyester is tight, disperse dyes are almost not dyed at low temperatures. It needs to be dyed at high temperatures (usually 130°C) to obtain satisfactory results. Nylon can be dyed with disperse dyes, neutral dyes and acid dyes. Nylon has a strong affinity for dyes and is easy to color.
2. Dyeing effect:
The color of polyester after dyeing is usually bright, but if there are problems in the dyeing process, such as color flowers or spots, the color reduction of polyester fabrics can be achieved by high-temperature transfer dyeing, using specific color repair agents and conditions for treatment. Nylon has a natural color after dyeing, but the color reduction treatment is relatively difficult, especially when neutral or acid dyes are used, because these dyes are more firmly combined with nylon.
3. Color fastness:
The color fastness of polyester after dyeing is usually high, but the color fastness of nylon after dyeing may be affected by many factors, such as dyeing process, fiber characteristics, etc.
4. Dyeing temperature:
Polyester dyeing requires a higher temperature, usually around 130°C, to ensure that the dye molecules can diffuse into the fiber. Nylon dyeing can be carried out at a lower temperature, but some dyeing processes may also require high temperatures to improve dyeing uniformity and fastness.
5. Finishing after dyeing:
Polyester dyeing may require reduction cleaning to remove floating colors and improve color fastness. Nylon dyeing finishing may include steam fixation, heat fixation or chemical fixation to ensure that the dye is firmly bonded to the fiber.
6. Dye selection:
When dyeing polyester, the choice of dye is more specific, and disperse dyes suitable for high temperature and high pressure dyeing are required. When dyeing nylon, the choice of dye is more diverse, but the compatibility of the dye with the nylon fiber and the color effect after dyeing need to be considered.
Through the comparison of the above aspects, the dyeing effects of polyester and nylon can be distinguished. It should be noted that process control, dye selection and post-treatment during the dyeing process will affect the final dyeing effect.
