A kind of preparation method of polyamide-imide copolymerized fiber

An imide copolymer fiber and polyamide technology, applied in the field of spinning fibers, can solve the problems of insufficient ultraviolet aging resistance and mechanical properties of fibers, and process complexity, so as to achieve improved strength and ultraviolet aging resistance, and a simple process flow. High efficiency and low production environment requirements

Active Publication Date: 2022-06-03
ZHUZHOU TIMES NEW MATERIALS TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the process complexity caused by intermediate acid storage, high-low temperature polymerization and high-temperature thermal imidization mentioned in the above background technology, as well as insufficient UV aging resistance and mechanical properties of fibers, etc. Problem, provide a kind of preparation method of high-performance polyamide-imide copolymerization fiber

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
  • A kind of preparation method of polyamide-imide copolymerized fiber
  • A kind of preparation method of polyamide-imide copolymerized fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Trimellitic anhydride and pyromellitic dianhydride are dissolved in N,N-dimethylacetamide at a molar ratio of 1:0.15, and under the protection of high-purity nitrogen, stirring and dissolving at -10°C to obtain a mixed solution. Keep its temperature at -10°C, control the ratio of the total molar amount of trimellitic anhydride and dianhydride monomers to the molar amount of diphenylmethane diisocyanate to be 1:1.01, and add diphenylmethane diisocyanate monomer to the mixed solution in 8 batches , the control system temperature does not exceed 20 ℃. After the feeding is completed, the temperature is raised to 85°C at 5°C / min and maintained at this temperature for 30min, and then gradually raised to 160°C at 5°C / min to obtain a copolymerized modified polyamide-imide spinning stock solution, The mass content of the stock solution is 19.2%, and the logarithmic viscosity is 2.04;

[0035] (2) After the polyamide-imide spinning stock solution obtained in the previous ste...

Embodiment 2

[0037] (1) Dissolve trimellitic anhydride and pyromellitic dianhydride in N,N-dimethylacetamide at a molar ratio of 1:0.25, and stir and dissolve at -15°C to obtain a mixed solution under the protection of high-purity nitrogen. Keeping its temperature at -15°C, the ratio of the total molar amount of trimellitic anhydride and dianhydride monomers to the molar amount of diphenylmethane diisocyanate is controlled to be 1:1.03, and the diphenylmethane diisocyanate monomer is added to the mixed solution in 8 batches , the control system temperature does not exceed 15 ℃. After the feeding is completed, the temperature is raised to 85°C at 5°C / min and kept at this temperature for 30min, and then gradually raised to 160°C at 3°C / min to obtain a copolymerized modified polyamide-imide spinning stock solution, The mass content of the stock solution is 21.4%, and the logarithmic viscosity is 2.21;

[0038] After the polyamide-imide spinning stock solution after step (1) is vacuum defoame...

Embodiment 3

[0040] (1) Dissolve trimellitic anhydride and pyromellitic dianhydride in N,N-dimethylacetamide at a molar ratio of 1:0.45, and stir and dissolve under the protection of high-purity nitrogen at -15°C to obtain a mixed solution. Keep its temperature at -15°C, the ratio of the total molar amount of trimellitic anhydride and dianhydride monomers to the molar amount of diphenylmethane diisocyanate is controlled to be 1:1.05, and the diphenylmethane diisocyanate monomer is added to the mixed solution in 8 batches , the control system temperature does not exceed 15 ℃. After the feeding is completed, the temperature is raised to 85°C at 5°C / min and maintained at this temperature for 30min, and then gradually raised to 145°C at 3°C / min to obtain a copolymerized modified polyamide-imide spinning stock solution, The mass content of the stock solution is 22.6%, and the logarithmic viscosity is 2.25;

[0041] After the polyamide-imide spinning stock solution after step (1) is vacuum defo...

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 preparation method of polyamide-imide copolymer fiber, which belongs to the technical field of spinning fiber, comprising (1) dissolving trimellitic anhydride and dianhydride monomers in an aprotic polar solvent, under nitrogen protection, Stir at low temperature to obtain a mixed solution; add diphenylmethane diisocyanate monomer in batches, and gradually heat up to 130-180°C to obtain a copolymerized modified polyamide-imide spinning stock solution; (2) polyamide-imide After vacuum defoaming and filtration, the spinning stock solution passes through the spinneret and enters the primary coagulation bath to obtain primary fibers, and then passes through the secondary coagulation bath, hot water drawing, washing, drying, oiling, and dry heat drawing Stretching, heat setting, cooling and oiling and winding to obtain polyamide-imide copolymer fibers. The preparation method of the invention has simple process, and the intermediate acid is easy to store, and the prepared polyamide-imide copolymer fiber has the characteristics of high strength and excellent ultraviolet aging resistance.

Description

technical field [0001] The invention belongs to the technical field of spinning fibers, and in particular relates to a preparation method of a copolymerized modified polyamideimide fiber. Background technique [0002] Because of its high strength, high modulus and high temperature resistance, high-performance fibers are widely used in aircraft, rockets, missiles and other aviation and aerospace equipment, as well as automobiles, ships, body armor, skis and other fields. Among them, aramid fibers are typical representatives of high-performance fibers, such as aramid Kevlar fibers from DuPont, Technora fibers from Teijin, and Armos fibers from Russia. Although the research on aramid fibers has been deepening, the problem of poor UV resistance has not been significantly improved. Under the condition of one year of outdoor natural light irradiation, the tensile strength of the fibers will decrease by 20-40%. %, which limits its use in complex environments such as high ozone con...

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 Patents(China)
IPC IPC(8): D01D5/06D01D1/02D01D5/14D01D5/12D01F6/78C08G73/14
CPCD01D5/06D01D1/02D01D5/14D01D5/12D01F6/78C08G73/14
Inventor 王进甘顺昌杨海洋曹凯凯杨佑刘含茂
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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