Nylon 6 and Nylon 66

The most common nylon products on the market are nylon 6 and nylon 66.

Nylon 6: The full name is polycaprolactam fiber, which is polymerized by caprolactam.

Nylon 66: The full name is polyhexamethylene adipamide fiber, which is polymerized by adipic acid and hexamethylene diamine.

Generally speaking, nylon 66 feels better than nylon 6, and the comfort of nylon 66 is also better than nylon 6, but it is difficult to distinguish nylon 6 from nylon 66 on the surface.

Common characteristics of nylon 6 and nylon 66:

The light resistance is poor. Under long-term sunlight and ultraviolet light irradiation, the intensity decreases and the color becomes yellow; its heat resistance is not good enough. It turns yellow after 5 hours at 150°C, and the strength and elongation decrease significantly. , The shrinkage rate increases. Nylon 6, 66 filaments have good low temperature resistance, and their resilience does not change much when the temperature is below minus 70°C. Its direct current conductivity is very low, and it is easy to generate static electricity due to friction during processing. Its conductivity increases with the increase of moisture absorption, and increases with the increase of humidity according to the law of exponential function. Nylon 6, 66 filaments have strong resistance to microbial action, and their resistance to microbial action in silt water or alkali is second only to that of chlorinated fiber. In terms of chemical properties, nylon 6, 66 filaments have alkali resistance and reducing agent resistance, but they have poor performance in acid resistance and oxidant resistance.