Manufacturing method for polyacrylonitrile-based carbon fiber protofilament

A polyacrylonitrile-based carbon fiber and polyacrylonitrile resin technology, which is applied in the field of solution spinning process to manufacture polyacrylonitrile-based carbon fiber precursors, can solve the problems of precursor purification and mechanical performance deterioration, and achieve good purification effect and invention Obvious effect

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the existing technology has not effectively solved the above-mentioned contradiction between the purification of the raw silk and the deterioration of the mechanical properties

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
  • Manufacturing method for polyacrylonitrile-based carbon fiber protofilament
  • Manufacturing method for polyacrylonitrile-based carbon fiber protofilament
  • Manufacturing method for polyacrylonitrile-based carbon fiber protofilament

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0035] Carry out the preparation of carbon fiber precursor according to the following steps:

[0036] 1) The polyacrylonitrile resin is prepared into a spinning solution with 45-58wt% NaSCN aqueous solution as a solvent, and the content of the polyacrylonitrile resin in the spinning solution is 10-14wt%. Using 8-16wt% NaSCN aqueous solution as a coagulation bath, adopting a wet spinning process to produce primary fibers through spinning and coagulation forming;

[0037] 2) The as-spun fiber is drawn in a water bath in 1 to 5 wt% NaSCN aqueous solution. The water bath temperature and the draw ratio of each embodiment are shown in Table 1, and this step is defined as pre-drawing in the table;

[0038] 3) The as-spun fibers are rinsed with deionized water, the water temperature is controlled at 45-60°C, and the rinse time is controlled at 2-20 minutes;

[0039] 4) The as-spun fiber is placed in the acidic aqueous solution for immersion, the control data of the acid and pH value,...

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 preparation method for a polyacrylonitrile-based carbon fiber protofilament. The third monomer of a spinning raw material polyacrylonitrile resin is itaconic acid. The preparation method comprises the following successive steps: preparing a spinning solution from the resin by using an aqueous solution of NaSCN and carrying out spinning and solidification so as to prepare a nascent fiber; placing the nascent fiber in the aqueous solution of NaSCN for water bath drafting and carrying out drip washing with deionized water; dipping the nascent fiber in an acidic aqueous solution; dipping the nascent fiber in a sodium hydroxide or potassium hydroxide aqueous solution; placing the nascent fiber in pure water for water bath drafting; subjecting the nascent fiber to hot bath rinsing until rinsing liquid is neutral and sodium or potassium ions cannot be measured, and then continuing rinsing for 5 to 15 min; and carrying out post-processing procedures like oiling and dry densification on the nascent fiber so as to obtain a product of the polyacrylonitrile-based carbon fiber protofilament. According to the invention, purification of the protofilament is realized through rinsing, and breaking strength of fibers is not affected, so the defects of the prior art are overcome.

Description

technical field [0001] The invention relates to a method for manufacturing polyacrylonitrile-based carbon fiber precursors, in particular to using itaconic acid as a third comonomer of polyacrylonitrile resin as a spinning raw material to produce polyacrylonitrile-based carbon fiber precursors through a solution spinning process Methods. Background technique [0002] Carbon fiber has excellent mechanical properties, and its extremely high specific strength and specific modulus are incomparable to other materials. As a reinforcing material, it is widely used in the fields of aerospace, aircraft and sports equipment manufacturing. Carbon fibers are usually made from pre-oxidized and carbonized precursors made of carbonizable substances. Because polyacrylonitrile resins have a high carbonization yield, polyacrylonitrile fibers are very ideal carbon fiber precursors. The prepared carbon fibers It is called polyacrylonitrile-based carbon fiber. [0003] In order to obtain polya...

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): D01F6/38D01F11/06D01F9/22D01D5/14D01D10/06C08F220/44C08F220/14C08F220/18C08F218/08C08F222/02
Inventor 顾文兰陆正鸣黄翔宇冯林明袁玉红吴嵩义张捷
Owner CHINA PETROLEUM & CHEM CORP
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