Preparation method of nylon 6 having high hygroscopicity, high dyeing property and high elasticity

Abstract

The invention provides a preparation method of nylon 6 having high hygroscopicity, high dyeing property and high elasticity, The method is characterized by adding 50-85 parts of caprolactam, 5-8.5 parts of ring-opening agent, 0.3-6 parts of dicarboxylic acid blocking agent and 0.3-6 parts of composite amine modifier into to a reaction vessel; under the protection of nitrogen, preparing composite amine / polyamide performed polymer through ring opening, normal-pressure polymerization and reduced-pressure polymerization; adding polyether with same number of moles as the dicarboxylic acid blocking agent, preparing composite amine / polyether / polycaprolactam copolymer in the presence of a catalyst through normal-pressure polymerization and reduced-pressure polymerization; and extracting and drying to obtain the final product of nylon 6 with high hygroscopicity, high dyeing property and high elasticity. According to the invention, the method has simple process, production can be performed by using existing equipment, and nylon 6 not only has excellent physical and mechanical properties, but also has good spinnability, optical / thermal stability, elasticity, hygroscopicity and dyeing property, thus not only having enhanced dying depth and dying uniformity, but also being capable of being applied to chemical fiber, engineering plastics, membrane materials and the like.

Description

technical field

[0001] The invention relates to a preparation method of highly hygroscopic dyed and highly elastic nylon 6. technical background

[0002] Nylon 6, also known as polycaprolactam, polyamide 6, or PA6, is made through ring-opening polymerization of caprolactam and is one of the main raw materials for engineering plastics and chemical fibers.

[0003] The chemical fiber spun from nylon 6 is called nylon 6 (chemical name: polyamide 6 fiber), which has high breaking strength, excellent abrasion resistance, light specific gravity, elasticity and hygroscopic dyeability than other synthetic fibers. Excellent chemical stability, not easy to mould, etc. Therefore, nylon 6 has a wide range of uses, and can be used to make socks, underwear, clothing fabrics, non-woven fabrics, etc., and can also be used as tire cords, conveyor belts, cables, etc. However, because the nylon 6 molecular chain contains amido (-NH-CO-), and the molecular chain is regular, there are a lot of ...