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

A technology with high elasticity and high moisture absorption, which is applied in the field of high moisture absorption dyeing and preparation of high elasticity nylon 6, which can solve the problems of insufficient elasticity, dyeability inferior to natural fibers, and high crystallinity of nylon 6 fibers.

Inactive Publication Date: 2013-02-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the nylon 6 molecular chain contains amido (-NH-CO-), and the molecular chain is regular, there are a lot of hydrogen bonds between the molecules, which makes the nylon 6 fiber have a high degree of crystallinity, and its dyeability is not as good as that of natural fibers. Less than spandex and PBT fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using the widely used and mature hydrolysis ring-opening process route for the production of nylon 6, 800.0g of caprolactam, 14.8g of isophthalic acid, 8.0g of aminocaproic acid, 2.1g of SEED, and 2.5ml of 3-Diethylaminopropylamine, under the protection of nitrogen, slowly heat up from room temperature until the material melts, stir, heat up to 200°C for hydrolysis and ring-opening reaction for 2 hours; React 3h under the stirring speed of 3h; Then, depressurize to 5000Pa to react 2h, make composite amine / polyamide prepolymer; Add 88.9g molecular weight to the prepolymer that is 1000 polyethylene glycol and 0.9g Butyl titanate was reacted for 4 hours at a temperature of 270°C and a stirring speed of 500r / min; then, the pressure was reduced to 5000Pa and the reaction was carried out for 2 hours to obtain a complex amine / polyether / polycaprolactam copolymer; finally, it was extracted with boiling water and dried to produce High moisture absorption dyeing, high elasticity n...

Embodiment 2

[0020] Add 700.1g of caprolactam, 16.6g of isophthalic acid, 70.0g of aminocaproic acid, 2.5g of SEED, and 3.5ml of 3-diethylaminopropylamine into the reaction vessel, and slowly heat up from room temperature under nitrogen protection Until the material melts, stir and heat up to 210°C for hydrolysis and ring-opening reaction for 1 hour; then heat up to 260°C and react for 4 hours under a pressure of 0.4MPa and a stirring speed of 700r / min; then, reduce pressure to 2000Pa and react for 1 hour to prepare Obtain complex amine / polyamide prepolymer; Add 200.0g of poly(1,3-propylene glycol) with a molecular weight of 1000 and 2.0g of lithium alkoxide to the prepolymer under the protection of nitrogen. React at a stirring speed for 5 hours; then, reduce the pressure to 2000Pa and react for 3 hours to obtain a complex amine / polyether / polycaprolactam copolymer, and finally obtain highly hygroscopic dyed and highly elastic nylon 6 after boiling water extraction and drying.

Embodiment 3

[0022] Add the caprolactam of 600.1g, the terephthalic acid of 17.7g, the aminocaproic acid of 60.1g, the SEED of 2.0g, the 3-diethylaminopropylamine of 10ml in the reaction vessel, under nitrogen protection, slowly warming up from room temperature to The material is melted, stirred, and heated to 205°C for 1.5 hours of hydrolysis and ring-opening reaction; then heated to 250°C, reacted for 6 hours under a pressure of 0.6MPa and a stirring speed of 1000r / min; then reduced to 500Pa and reacted for 0.5h to prepare Obtain complex amine / polyamide prepolymer; Add 320.0g of poly-1,4-butanediol and 3.2g of butyl titanate with a molecular weight of 3000 to the prepolymer under nitrogen protection, at a temperature of 240°C, 1000r / React at a stirring speed of min for 6 hours; then, reduce the pressure to 500 and react for 2.5 hours to obtain a complex amine / polyether / polycaprolactam copolymer, and finally obtain a highly hygroscopic dyed and highly elastic nylon 6 after boiling water e...

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G69/40
Inventor 尹翠玉刘思张宇峰
Owner TIANJIN POLYTECHNIC UNIV
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