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
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  • 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 po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] (1) Add 2 parts of 4-amino-2,2,6,6-tetramethylpiperidine and 1 part of 6-aminocaproic acid to the reaction kettle and mix, and add 0.3 part of acetic acid, at 125°C reaction temperature, The 6-aminocaproic acid is condensed with the piperidine derivative with steric hindrance, and after 20 hours of reaction, a hindered amine prepolymerized unit is prepared.

[0035] (2) The caprolactam and hindered amine prepolymerization unit are mixed in a mass ratio of 1000:3, metered and transported by a metering pump, and mixed through a static mixer, and then added to a pressurized prepolymerization-atmospheric 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 from hindered amine pre-polymerization unit is obtained, and then the polymerized melt is passed t...

Example Embodiment

[0036] Example 2

[0037] (1) Add 2 parts of 4-amino-2,2,6,6-tetramethylpiperidine and 1 part of 6-aminocaproic acid to the reaction kettle and mix, and add 0.1 part of sulfuric acid, at 150℃ reaction temperature, The 6-aminocaproic acid is condensed with the piperidine derivative with steric hindrance effect, and after reacting for 1 hour, a hindered amine prepolymerized unit is prepared.

[0038] (2) The caprolactam and hindered amine prepolymerization unit are mixed in a mass ratio of 1000:10, and they are metered and transported by a metering pump. After mixing through a static mixer, they are added to a pressurized prepolymerization-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 from hindered amine pre-polymerization unit is obtained, and then the...

Example Embodiment

[0039] Example 3

[0040] (1) Add 2 parts of 2,2,6,6-tetramethyl-4-piperidinol and 1 part of 6-aminocaproic acid to the reactor and mix, and add 0.1 part of benzenesulfonic acid, and react at 270℃ At temperature, the 6-aminocaproic acid is condensed with the piperidine derivative with steric hindrance, and the hindered amine prepolymerized unit is made after 0.5 hours of reaction.

[0041] (2) The caprolactam and hindered amine prepolymerization unit are mixed in a mass ratio of 1000:0.5, metered and transported by a metering pump, and mixed through a static mixer, and then added to a pressurized prepolymerization-atmospheric main polymerization continuous polymerization reactor for polymerization Reaction: After 14 hours of polymerization under the pre-polymerization temperature of 270℃ and the main polymerization temperature of 230℃, the nylon 6 resin for fibers prepared from the hindered amine pre-polymerization unit is obtained, and then the polymerization melt is continuously ...

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PUM

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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

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Application Information

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IPC IPC(8): C08G69/14C08G69/16D01F6/80
Inventor 杨金富甘纯玑
Owner FUJIAN JINGFENG TECH
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