High-viscosity polyamide-6 preparation method

A polyamide, high-viscosity technology, applied in the field of preparation of high-viscosity polyamide-6, can solve the problems of increasing melt, decomposition and carbonization, long residence time, etc., and achieve the effects of reducing energy loss, increasing viscosity and improving efficiency

Inactive Publication Date: 2018-02-09
JIANGSU RUIMEIFU IND
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The high relative viscosity polyamide-6 produced by the above method has low content of terminal amino groups, which is unfavorable for dyeing;
[0006] At the same time, in the polymerization process of the above-mentioned manufacturing method, since the melt in the post-polymerization tube already has a certain high relative viscosity, it is difficult to quickly remove the water in the bottom melt. Vacuum degree and the longer residence time of the melt in the post-polymerization tube, the high vacuum degree will aggr

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
  • High-viscosity polyamide-6 preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] The specific implementation of the present invention will be described in further detail below in conjunction with the examples. The following examples are used to illustrate the present invention, but not to limit the scope of the present invention.

[0028] A preparation method of high-viscosity polyamide-6 includes the following steps:

[0029] A. Raw material preparation: Put the solid caprolactam into the melting kettle through the pulverizer and melt it into liquid caprolactam with a temperature of 120℃. Pour the liquid caprolactam and capping agent A into the intermediate tank and mix evenly. After preheating to 165℃, pass the preheater After being heated to 205°C, it is injected into the pre-polymerization tube, and the capping agent A is diethylene triamine;

[0030] B. Pre-polymerization: Drop the aqueous solution or dispersion of end-capping agent B into the forward polymerization tube. The front polymerization tube has three independent heating systems for the upp...

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 discloses a high-viscosity polyamide-6 preparation method. According to the present invention, the polyamide-6 is tackified by using the following methods that the tri-amino end-cappingagent is added to increase the amino terminal content, the conveying pressure between the front polymerization pipe and the rear polymerization pipe is increased, the flat wet slices are obtained through slicing, the solid phase condensation polymerization efficiency in the second-stage drying is improved, and the energy loss is reduced.

Description

technical field [0001] The invention relates to the technical field of polymer polymerization, in particular to a preparation method of high-viscosity polyamide-6. Background technique [0002] Polyamide-6 is a commonly used polymer raw material, mainly used in the fields of spinning and engineering plastics, and its relative viscosity is generally 2.4-3.0. If polyamide-6 is used in the field of polymer films, its relative viscosity is usually required to reach 3.2-4.0, and the relative viscosity essentially reflects the relative molecular weight of the polymer. [0003] The production method of polyamide-6 by hydrolytic polymerization is well known. It is pointed out in the book "Polyamide Resin Handbook" that the relative molecular weight of polyamide is significantly affected by the water content of the reaction system in the later stage of the polymerization process. Therefore, in the actual production process , The core process of manufacturing high-viscosity polyamide...

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): C08G69/16
CPCC08G69/16
Inventor 杨勇
Owner JIANGSU RUIMEIFU IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap