Method for improving whiteness of meta-aramid fiber

A technology of aramid fiber and whiteness, which is applied in the field of improving the whiteness of meta-aramid fiber, and can solve the problems that there is no method for improving the whiteness of meta-aramid fiber, the color of meta-aramid fiber is dark, and the whiteness is not high. , to achieve the effect of excellent flame retardant performance, uniform color and high whiteness

Pending Publication Date: 2021-09-07
LONGPONT
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation method of the existing meta-aramid fiber, the prepared meta-aramid fiber is dark in color, and the whiteness is not high, and there is no releva...

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 Construction

[0019] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The invention provides a method for improving the whiteness of meta-aramid fibers. During the low-temperature polycondensation reaction of m-phenylenediamine and isophthaloyl chloride, benzoyl chloride or benzylamine is added to intervene to obtain a polycondensation solution, which is then drawn The meta-aramid fiber is prepared by spinning or precipitating the fiber.

[0021] In the usual reaction between isophthaloyl dichloride and m-phenylenediamine, there will be excess acid chloride groups or amino groups. If these grou...

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 provides a method for improving the whiteness of meta-position aramid fiber, and belongs to the technical field of aramid fiber preparation. Benzoyl chloride or benzylamine is added in a low-temperature polycondensation reaction process of m-phenylenediamine and m-phthaloyl chloride for intervention to obtain polycondensation liquid, and then the meta-aramid fiber is prepared through drawing and spinning or fiber precipitation. According to the method, the benzoyl chloride or the benzylamine is added into a mixture of the m-phenylenediamine and the m-phthaloyl chloride for intervention, and during high-temperature treatment in the later processing process of the product, nitrogen protection is performed, so that the prepared meta-aramid fiber is very excellent in high-temperature resistance and flame retardance, and meanwhile, the color is uniform and the whiteness is relatively high; and the whiteness of the aramid fiber prepared through the drawing and spinning method is about 73-78, and the whiteness of the aramid fiber prepared through the fiber precipitation method is about 88-94.

Description

technical field [0001] The invention belongs to the technical field of aramid fiber preparation, in particular to a method for improving the whiteness of meta-aramid fiber. Background technique [0002] Aramid (Nomex is a type of aramid, which is phenylenediamide phthalamide), is a new type of high-tech synthetic fiber with ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, insulation, Anti-aging, long life cycle and other excellent properties, widely used in composite materials, bulletproof products, building materials, special protective clothing, electronic equipment and other fields. Aramid 1313, also known as meta-aramid, is a kind of "aromatic polyamide fiber" and has good flame retardancy, thermal stability, electrical insulation, Chemical stability, radiation resistance and mechanical properties were first successfully developed by DuPont Company of the United States and realized industrial production. However,...

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): D01F6/80C08G69/32C08G69/28
CPCD01F6/805C08G69/32C08G69/28
Inventor 李永锋蒋少波李健灿李健雄常小斌
Owner LONGPONT
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