Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing nylon 6 for fibers from hindered amine prepolymerization unit

A technology of hindered amine and nylon, which is applied in the field of preparation of nylon 6 for fiber, can solve problems such as uneven mixing, uneven dispersion, and light stabilization of polymer performance, and achieve uniform molecular weight distribution, good viscosity stability, and solve Effects of yellowing and quality instability

Active Publication Date: 2013-07-17
FUJIAN JINGFENG TECH
View PDF13 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hindered amines have various advantages as light stabilizers in polymers, due to their small amount, uneven mixing will inevitably occur in melt mixing, and they are still in a free blending state with polymers, so it will inevitably lead to uneven dispersion. Uniformity, as well as defects due to the aggregation of this additive, thereby reducing the performance of the polymer and limiting its photostabilization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Mix 2 parts of 4-amino-2,2,6,6-tetramethylpiperidine and 1 part of 6-aminocaproic acid into the reaction kettle, add 0.3 parts of acetic acid, and at a reaction temperature of 125°C, Condensing 6-aminocaproic acid with piperidine derivatives with steric hindrance effect, and reacting for 20 hours to prepare hindered amine prepolymerized units.

[0035] (2) Mix caprolactam and hindered amine pre-polymerization units at a mass ratio of 1000:3, metered and transported by a metering pump, and after mixing by a static mixer, add a pressurized pre-polymerization-atmospheric pressure main polymerization continuous polymerization reactor for polymerization Reaction: Under the conditions of pre-polymerization temperature of 250°C and main polymerization temperature of 230°C, after 5 hours of polymerization, the nylon 6 resin for fibers prepared by the hindered amine pre-polymerization unit is obtained, and then the polymerized melt passes through the melt metering pump Strip...

Embodiment 2

[0037] (1) Add 2 parts of 4-amino-2,2,6,6-tetramethylpiperidine and 1 part of 6-aminocaproic acid into the reaction kettle and mix, and add 0.1 part of sulfuric acid, and at a reaction temperature of 150°C, Condensation of 6-aminocaproic acid and piperidine derivatives with steric hindrance effects, and reacting for 1 hour to prepare hindered amine prepolymerized units.

[0038] (2) Mix caprolactam and hindered amine pre-polymerization units at a mass ratio of 1000:10, metered and transported by a metering pump, and after being mixed by a static mixer, put into a pressurized pre-polymerization-normal pressure main polymerization continuous polymerization reactor for polymerization Reaction: Under the conditions of pre-polymerization temperature of 250°C and main polymerization temperature of 250°C, after 2 hours of polymerization, the nylon 6 resin for fibers prepared by the hindered amine pre-polymerization unit is obtained, and then the polymerized melt passes through the mel...

Embodiment 3

[0040] (1) Mix 2 parts of 2,2,6,6-tetramethyl-4-piperidinol and 1 part of 6-aminocaproic acid into the reaction kettle, add 0.1 part of benzenesulfonic acid, and react at 270°C Under temperature, 6-aminocaproic acid is condensed with piperidine derivatives with steric hindrance effect, and the hindered amine prepolymerization unit is prepared after reacting for 0.5 hours.

[0041] (2) Mix caprolactam and hindered amine pre-polymerization units at a mass ratio of 1000:0.5, metered and transported by a metering pump, and mixed by a static mixer, then added to a pressurized pre-polymerization-atmospheric pressure main polymerization continuous polymerization reactor for polymerization Reaction: Under the conditions of pre-polymerization temperature of 270°C and main polymerization temperature of 230°C, after 14 hours of polymerization, the nylon 6 resin for fibers prepared by the hindered amine pre-polymerization unit is obtained, and then the polymerization melt is continuously p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing nylon 6 for fibers from a hindered amine prepolymerization unit. The nylon 6 for fibers is formed by polymerizing caprolactam and the hindered amine prepolymerization unit in the mass ratio of 1000:(0.5-10). The hindered amine prepolymerization unit is generated by pre-condensing a piperidine derivative with a steric-hinerance effect and 6-aminocaproic acid in the presence of a catalyst, wherein the molar ratio of the piperidine derivative with the steric-hinerance effect to 6-aminocaproic acid to the catalyst is equal to 2:1:(0.1-0.3); the reaction temperature is 125-270 DEG C; and the reaction time lasts for 0.5-20 hours. By the method, the problems of nylon fiber yellowing and unstable quality can be effectively solved, and the obtained anti-yellowing nylon 6 for fibers is uniform in molecular weight distribution, good in viscosity stability, free of oxidization and ageing, and suitable for processing high-quality nylon fibers.

Description

technical field [0001] The invention relates to a method for preparing nylon 6 for fibers, in particular to a method for preparing nylon 6 for fibers from hindered amine prepolymerized units. Background technique [0002] With the continuous expansion of the polyamide fiber market in my country, especially driven by the rapid increase in the demand for ultra-fine denier yarns, higher requirements are put forward for the production capacity and synthesis quality of polyamide, especially the molecular weight distribution of polyamide. [0003] Yellowing is an important technical problem in the production and use of polyamide fibers. The main reasons are the following factors: light and heat cause polyamide to age and oxidize, leading to broken chains and decomposition, resulting in yellowing ; Nitrogen oxides in the air cause the amino oxidation of polyamide to produce yellow substances, resulting in yellowing; under alkaline conditions, it causes yellowing. [0004] In order...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G69/14C08G69/16D01F6/80
Inventor 杨金富甘纯玑
Owner FUJIAN JINGFENG TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com