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

A method of improving the preoxidation speed of polyacrylonitrile fiber by physical blending

A technology of polyacrylonitrile fiber and physical blending, applied in the direction of fiber chemical characteristics, synthetic polymer artificial filament chemical post-treatment, melt spinning method, etc., to achieve the effect of eliminating environmental pollution, reducing production cost, and less micropores

Active Publication Date: 2016-06-08
优聚新材料(浙江)有限公司
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for increasing the preoxidation speed of polyacrylonitrile fibers through physical blending. The spinning process of this method is simple, the process is easy to control, the raw material lignin is cheap and easy to obtain, and this method also avoids the The use of a large number of toxic or corrosive chemical solvents not only saves solvent consumption, but also eliminates the "three wastes" treatment in the production process, which can greatly reduce production costs and eliminate environmental pollution caused by the use of solvents

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 method of improving the preoxidation speed of polyacrylonitrile fiber by physical blending
  • A method of improving the preoxidation speed of polyacrylonitrile fiber by physical blending
  • A method of improving the preoxidation speed of polyacrylonitrile fiber by physical blending

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer with a mass ratio of 0:40:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 4.63cN / dtex. spinning fibers. Pre-oxidize the new polyacrylonitrile precursor with air in the tube furnace, the air flow rate is 5Lmin -1 , the pre-oxidation temperature is controlled in five temperature zones (170, 200, 220, 240, 260° C.), and the pre-oxidation 54min to obtain a relative deg...

Embodiment 2

[0033] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer at a mass ratio of 10:30:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 4.43cN / dtex. spinning fibers. Pre-oxidize the new polyacrylonitrile precursor with air in the tube furnace, the air flow rate is 5Lmin -1 , the pre-oxidation temperature is controlled in five temperature zones (170, 200, 220, 240, 260°C), and the pre-oxidized yarn with a relative degree of cyc...

Embodiment 3

[0035] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer at a mass ratio of 15:25:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 5.16cN / dtex. spinning fibers. Pre-oxidize the new polyacrylonitrile precursor with air in the tube furnace, the air flow rate is 5Lmin -1 , the pre-oxidation temperature is controlled in five temperature zones (180, 200, 230, 250, 280°C), and the pre-oxidized yarn with a relative degree of cyc...

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 method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending. The method comprises the following steps: performing vacuum drying on polyacrylonitrile, lignin and a plasticizer, and uniformly stirring and mixing, thus obtaining a mixed material; spinning, setting and winding to obtain a melt spun fiber, wherein a mass ratio of polyacrylonitrile to lignin to the plasticizer is (5-30):(10-30):(50-70); and performing water bath drawing on the melt spun fiber, and performing pre-oxidation to obtain the pre-oxidation polyacrylonitrile fiber. The raw material lignin is low in cost and slight in environmental pollution and is suitable for industrial production; lignin contains lots of hydroxyl groups which can achieve hydrogen-bond interaction with a polar group cyano on a polyacrylonitrile molecular chain, and lignin and polyacrylonitrile have high compatibility; moreover, the oxygen content in the lignin structure is high, the oxygen can be released in the pre-oxidation process, a uniform oxygen source is provided for an oxidation reaction of a polyacrylonitrile precursor, and a prepared pre-oxidation thread sheath-core is small in difference and dense and uniform in structure.

Description

technical field [0001] The invention belongs to the field of modification of polyacrylonitrile fibers, in particular to a method for increasing the preoxidation speed of polyacrylonitrile fibers through physical blending. Background technique [0002] The industrial goals of carbon fiber production are to reduce costs, improve carbon fiber performance and production efficiency. Shortening the pre-oxidation time is the key to reducing the production cost of carbon fiber, but the short time will aggravate the skin-core structure, and large voids and defects are likely to occur in the carbonization stage, resulting in a decrease in the mechanical properties of carbon fiber. Lowering the pre-oxidation temperature and prolonging the pre-oxidation time, the skin-core structure of the pre-oxidized fiber is not obvious, which is beneficial to improve the performance of carbon fiber, but reduces the production efficiency. Therefore, an excellent pre-oxidation process has not been st...

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): D01F8/08D01F8/18D01F1/10D01F11/06D01F9/22D01D5/08D01D1/04D01D5/14D01D10/02
Inventor 余木火陈磊刘淑萍郑颖韩克清
Owner 优聚新材料(浙江)有限公司
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