Opaque Milky White
Nylon Yarn 66 or simply Nylon 66 (also known as nylon 6-6, nylon 6/6, nylon 6,6, or nylon 6:6) is a type of polyamide. It, and nylon 6, are the two most common for textile and plastic industries. Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name.
Nylon 66 is synthesized by a process of polycondensation of hexamethylenediamine and adipic acid. Equivalent amounts of hexamethylenediamine and adipic acid are combined with water in a reactor. This is crystallized to make nylon salt, an ammonium/carboxylate mixture. The nylon salt goes into a reaction vessel where the polymerization process takes place either in batches or continuously. Below is the reaction:
n(HOOC - (CH2)4 - COOH) + n(H2N - (CH2)6 - NH2) -> [-OC - (CH2)4 - CO - NH - (CH2)6 - NH - ]n + (2n - 1)H2O
Removing water drives the reaction toward polymerization through the formation of amide bonds from the acid and amine functions. Thus molten nylon 66 is formed. It is later spinned and cooled to create filaments that form Nylon yarn 66.
Automotive Applications - PA6 and PA66 are often used as an alternative to metal in automotive under the hood parts where design flexibility as well as temperature and chemical resistance are critical. PA66's mechanical properties (stiffness, creep resistance, etc.) help improve safety and comfort in cars.
Electrical & Electronics Applications - Flame Retarded PA Works Well - In the electrical and electronic applications, Polyamides 6 and 66 grades are good candidates where specific tests (GWIT, UL94) need to be passed. PA6 & PA66 can easily be flame retarded and halogenated & non-halogenated FR solutions are commercially available.
Consumer Applications - Polyamide 66 offers solutions for durable Consumer and Industrial Goods. PA66 is an excellent material when complex designs are needed, and it is also a cost efficient solution.
Food Packaging - PA6 and PA66 offer very high puncture resistance, barrier resistance to oxygen, carbon dioxide and aromas, transparency, etc. All these properties make PA6, PA66 ideal for use in food packaging (mono or multi-layer). In the medical field, PA6 is fabricated into tough, puncture-resistant packages for medical blister packs.
Furniture Applications - For the furniture market, PA6, PA66 is used to manufacture stadium seats
Sports & Leisure - The exceptional fatigue properties and high impact and mechanical strength of PA6 and PA66 contribute in sports applications where they are used to manufacture Ski bindings.
Other applications include agricultural films, liquids packaging, protective packaging, medical, etc.