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A method for regulating polyacrylonitrile-based carbon fiber and its surface groove structure

A polyacrylonitrile-based carbon fiber and groove technology, applied in the field of carbon fiber, can solve the problems of reducing the effective force-bearing area of ​​the fiber, the large difference in the depth of the groove on the fiber surface, and reducing the strength, and achieves the depth and uniformity. The effect of controllable groove structure and reduction of solidification rate differences

Active Publication Date: 2020-09-29
山西钢科碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the polyacrylonitrile-based carbon fibers currently produced by manufacturers have large differences in the depth of grooves on the fiber surface (local grooves are extremely deep), large fiber surface roughness, and poor axial parallelism of groove fibers.
The deep local groove of the fiber leads to the reduction of the effective stress area and strength of the fiber, and the stress concentration point is easily formed at the bottom of the deep groove
The roughness of the fiber surface is large, the axial parallelism of the grooves is poor, and the grooves are messy and criss-crossed, which is not conducive to the seepage and uniform spreading of the sizing agent and composite resin along the grooves on the fiber surface. Low performance and large dispersion

Method used

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  • A method for regulating polyacrylonitrile-based carbon fiber and its surface groove structure
  • A method for regulating polyacrylonitrile-based carbon fiber and its surface groove structure
  • A method for regulating polyacrylonitrile-based carbon fiber and its surface groove structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 1) Preparation of spinning dope

[0094] Add the monomer acrylonitrile / itaconic acid / 2-acrylamido-2-methylpropanesulfonic acid into the reactor with stirring device according to the ratio of 97.8 / 1.00 / 1.2; the total monomer accounts for the mass percentage of the solution Is 25%. The amount of initiator azobisisobutyronitrile is 2% of the total weight of the monomer, and dimethylformamide is used as a solvent for solution polymerization. During the polymerization process, first bubbling high-purity nitrogen into the reactor for 15 minutes to replace the air in the reaction system, then start stirring and raise the temperature to 60°C, under the protection of nitrogen, constant temperature polymerization for 20 hours to obtain polyacrylonitrile spinning liquid.

[0095] 2) Solidification molding

[0096] Using wet spinning, the spinning solution is sprayed from the spinneret and then passes through an eight-stage coagulation bath to coagulate and form. Among them, the compo...

Embodiment 2

[0131] The difference from Example 1 is that the type of regulator in the coagulation bath is changed from ethanol to n-propanol.

Embodiment 3

[0133] The difference from Example 1 is that the type of regulator in the coagulation bath is changed from ethanol to ammonia.

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Abstract

The invention relates to a polyacrylonitrile-based carbon fiber and a regulating method of a surface groove structure of the fiber. According to the main technical scheme, the regulating method of thesurface groove structure of the polyacrylonitrile-based carbon fiber comprises the step that in the solidification forming procedure of the step of preparing the polyacrylonitrile-based carbon fiber,a spinning trickle sprayed out by a spinneret device is solidified and formed into nascent fibers, and the surface groove structure of the polyacrylonitrile-based carbon fiber is regulated by adjusting solubility parameters of a solidification bath liquid. The surface groove structure of the polyacrylonitrile-based carbon fiber is regulated to be within the following ranges that the maximal depthof the groove is 0.06-0.65 micrometer, the average groove depth is 0.043-0.49 micrometer, the fiber surface roughness is 0.01-0.12 micrometer, and the average spacing of the groove top is 0.1-0.6 micrometer. The regulating method is mainly used for effectively controlling the surface groove structure of the polyacrylonitrile-based carbon fiber, so that the groove depth is suitable, the surface roughness is suitable, and the groove axial parallelity is good.

Description

Technical field [0001] The invention relates to the technical field of carbon fibers, in particular to a polyacrylonitrile-based carbon fiber and a method for adjusting and controlling the surface groove structure. Background technique [0002] Carbon fiber is composed of a so-called "chaotic layer" structure composed of flake graphite crystallites stacked in the axial direction of the fiber. The structure of carbon fiber is usually regarded as composed of two-dimensional ordered crystals and holes. From the perspective of development history, polyacrylonitrile-based carbon fiber is a new material developed to meet the needs of cutting-edge industries such as aerospace, aviation, and atomic energy. It has high tensile strength, high tensile modulus, low density, high temperature resistance, Ablative resistance, corrosion resistance, high electrical and thermal conductivity, low thermal expansion, self-lubricating and good biocompatibility. [0003] Polyacrylonitrile-based carbon f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01D5/06D01D10/02D01F6/38
CPCD01D5/06D01D10/02D01F6/38D01F9/22
Inventor 吕春祥邵伟隋敏李永红
Owner 山西钢科碳材料有限公司
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