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

Method for preparing functional nylon 6 fiber based on melt direct spinning technology

A melt direct spinning and functionalization technology, applied in the field of nylon materials, can solve the problems of low polymer number average molecular weight, oligomer control, slow reaction speed, etc., to improve melt quality, reduce oligomer content, The effect of reducing the content

Active Publication Date: 2020-08-25
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the polymerization process is carried out in a liquid state, the polymerization temperature must be at least 10°C higher than the melting point of nylon 6. At this time, the polymerization temperature still cannot control the oligomer in the range of direct spinning of the melt, and there is another disadvantage of low temperature polymerization , that is, the reaction speed is slow, and the number-average molecular weight of the polymer obtained is relatively low; while the polymerization process at a lower temperature is actually divided into two parts, one part is a melt polymerization process, and the other part is a solid phase polymerization process. The process of polymerization is to obtain polymers with sufficient number-average molecular weight for product development, but there is no effective way to turn solid polymers formed at low temperatures into suitable spinning methods. If fibers are spun from low-temperature polymers , the polymer must be melted first, however, at this time due to the existence of a chemical reaction balance, low molecular weight compounds are formed, so that there is no advantage compared with the normal polymerization method

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing functional nylon 6 fiber based on melt direct spinning technology
  • Method for preparing functional nylon 6 fiber based on melt direct spinning technology
  • Method for preparing functional nylon 6 fiber based on melt direct spinning technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The first step: at a temperature of 75°C, caprolactam, HOOC (CH 2 ) 7 COOH, deionized water, zinc oxide and NH 2 (CH 2 ) 4 COOH was mixed in proportion, and stirred for 40min under the condition of mechanical stirring (1000r / min); wherein relative to caprolactam, the amount of deionized water added was 1.8wt%, HOOC (CH 2 ) 7 The amount of COOH added is 0.14wt%, NH 2 (CH 2 ) 4 The addition of COOH is 0.56wt%, and the addition of zinc oxide is 2wt%;

[0088] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 210 ° C, and the polymerization pressure is controlled at 1.2 MPa; the reaction time is The 0.6h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux rate is 1.6wt% of the caprolactam flow rate. When the following conditions ar...

Embodiment 2

[0095] The first step: at a temperature of 130°C, caprolactam, HOOC (CH 2 ) 5 COOH, deionized water, zinc borate, and NH 2 (CH 2 ) 6 COOH was mixed in proportion, and stirred for 30min under the condition of mechanical stirring (200r / min); wherein relative to caprolactam, the amount of deionized water added was 4.8wt%, HOOC (CH 2 ) 5 The amount of COOH added is 0.15wt%, NH 2 (CH 2 ) 6 The addition of COOH is 0.05wt%, and the addition of zinc borate is 5wt%;

[0096] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 248 ° C, and the polymerization pressure is controlled at 0.08 MPa; the reaction time is The 1.1h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux rate is 0.5wt% of the flow rate of caprolactam. When the following condit...

Embodiment 3

[0103] The first step: at a temperature of 98°C, caprolactam, HOOC (CH 2 ) 6 COOH, deionized water, titanium dioxide and NH 2 (CH 2 ) 4 COOH was mixed in proportion, and stirred for 50min under the condition of mechanical stirring (150r / min); wherein relative to caprolactam, the amount of deionized water added was 2.5wt%, HOOC (CH 2 ) 6 The amount of COOH added is 0.33wt%, NH 2 (CH 2 ) 4 The addition of COOH is 0.3wt%, and the addition of titanium dioxide is 1.5wt%;

[0104] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 238 ° C, and the polymerization pressure is controlled at 0.8 MPa; the reaction time is The 0.9h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux rate is 0.9wt% of the flow rate of caprolactam. When the followin...

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 the field of nylon materials, and discloses a method for preparing functional nylon 6 fiber based on the melt direct spinning technology. The method comprises the steps that firstly, burdening is conducted, caprolactam, an end-capping reagent, water and a catalyst are heated and mixed, and a mixture is obtained; secondly, ring opening is conducted; thirdly, pre-polycondensation is conducted, and the pre-polycondensation reaction and devolatilization are conducted; fourthly, final polycondensation is conducted, and the final polycondensation reaction and devolatilization are conducted; and fifthly, devolatilization is conducted before spinning; and sixthly, spinning is conducted, and the functional nylon 6 fiber is obtained. In the first step, functional componentsare added, or before devolatilization before spinning in the fifth step, functional nylon master batches containing functional components are added. The method can be divided into two parallel schemes, the functional components can be directly added in the first step, or the functional nylon master batches containing functional components are added before devolatilization in the fifth step. According to the method, fusion direct spinning is directly conducted after the functional components are added, devolatilization is conducted during pre-polycondensation and final polycondensation, and theproblem about poor functional component scattering can be solved.

Description

technical field [0001] The invention relates to the field of nylon materials, in particular to a method for preparing functionalized nylon 6 fibers based on melt direct spinning technology. Background technique [0002] Due to its excellent physical and mechanical properties and textile processing properties, nylon fiber (PA fiber, nylon) has ranked first in the synthetic fiber family for a long period of time since its appearance, but due to price and production costs Due to the limitation of polyester fiber and the rapid development of polyester fiber, it is now the second largest output of synthetic fiber. In 2018, my country's nylon output exceeded 3.3 million tons. Nylon 6 fiber has excellent physical properties unmatched by polyester fiber. For example, nylon 6 fiber has high breaking strength, wear resistance is the crown of general textile fibers, good hygroscopicity, elastic recovery rate and fatigue resistance, and good dyeability . Nylon 6 fiber is also widely us...

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
Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/90D01F1/10C08G69/46C08G69/16D01D5/08B01J19/18B01J19/00B01J3/00
CPCD01F6/90D01F1/10C08G69/16C08G69/46B01J3/006B01J19/0053B01J19/18D01D5/08
Inventor 徐锦龙王松林汤廉黄家鹏何宁艳王华平王朝生
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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