Drafting method for preparation of mesophase pitch fiber precursor

A mesophase pitch and drafting technology, applied in stretch spinning, spinneret assemblies, textiles and papermaking, etc., can solve problems such as short curing time, large fiber damage, and high fiber brittleness, and reduce broken filaments Effects of damage to original filaments, reduction in frequency and number of times, and fine pore size

Inactive Publication Date: 2018-07-10
西安天运新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a drafting method for preparing mesophase pitch, which solves the problem of high brittleness of mesophase pitch fibers, short stretchable area, short curing time, large damage to fibers during the drafting process and inability to pass through the mesophase pitch fibers in the prior art Technical Problems of Raw Silk with Fine Diameter by Drawing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The drafting method for preparing the mesophase pitch raw silk is as follows: the mesophase pitch is extruded through the spinneret in the spinning assembly after the mesophase pitch is passed through the metering pump, and a certain length of slow cooling zone is set behind the spinneret, and the extruded mesophase pitch is passed through After the slow cooling zone, drafting is carried out under the joint action of gravity and drafting rollers to form the precursors of mesophase pitch fibers; the mesophase pitch fibers maintain drawability in the slow cooling zone; the spinneret is perpendicular to the drafting rollers Arrangement, the distance from the spinneret to the drafting roller is 1 meter; with the extrusion of the mesophase pitch, the mesophase pitch fiber is drawn down to a diameter of 20-30um under the action of gravity, and then wound on the drafting roller, and then Gradually increase the speed of the draft rollers to draft speed. Among them, the mesophas...

Embodiment 2

[0022] The drafting method for preparing the mesophase pitch raw silk is as follows: the mesophase pitch is extruded through the spinneret in the spinning assembly after the mesophase pitch is passed through the metering pump, and a certain length of slow cooling zone is set behind the spinneret, and the extruded mesophase pitch is passed through After the slow cooling zone, drafting is carried out under the joint action of gravity and drafting rollers to form the precursors of mesophase pitch fibers; the mesophase pitch fibers maintain drawability in the slow cooling zone; the spinneret is perpendicular to the drafting rollers Arrangement, the distance from the spinneret to the drafting roller is 2 meters; with the extrusion of the mesophase pitch, the mesophase pitch fiber is drawn down to a diameter of 20-30um under the action of gravity, and then wound on the drafting roller, and then Gradually increase the speed of the draft rollers to draft speed. Among them, the mesopha...

Embodiment 3

[0024] The drafting method for preparing the mesophase pitch raw silk is as follows: the mesophase pitch is extruded through the spinneret in the spinning assembly after the mesophase pitch is passed through the metering pump, and a certain length of slow cooling zone is set behind the spinneret, and the extruded mesophase pitch is passed through After the slow cooling zone, drafting is carried out under the joint action of gravity and drafting rollers to form the precursors of mesophase pitch fibers; the mesophase pitch fibers maintain drawability in the slow cooling zone; the spinneret is perpendicular to the drafting rollers Arrangement, the distance from the spinneret to the drafting roll is 3 meters; with the extrusion of the mesophase pitch, the mesophase pitch fiber is drawn down to a diameter of 20-30um under the action of gravity, and then wound on the drafting roll, and then Gradually increase the speed of the draft rollers to draft speed. Among them, the mesophase p...

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Abstract

The invention discloses a drafting method for preparation of a mesophase pitch fiber precursor. Mesophase pitch is extruded by a spinneret plate in a spinning assembly, a certain length of retarded cooling area is arranged behind the spinneret plate, finally, drafting is performed under the joint action of gravity and a drafting roll, and the mesophase pitch fiber precursor is formed. Drafting isperformed by use of gravity and tension applied by the drafting roll, the frequency of turning of the precursor is reduced, so that precursor breaking and damage in the spinning process are effectively reduced, and precursor damage is prevented through a spinning channel. The drafting method is applicable to continuous drafting of precursors in the continuous spinning process of mesophase pitch fiber, the mesophase pitch fiber precursor with a small diameter can be obtained, and the obtained precursor has higher strength.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber precursor preparation and relates to a drafting method for preparing mesophase pitch fiber precursor. Background technique [0002] Mesophase pitch-based carbon fibers have excellent properties such as high thermal conductivity, high modulus, and negative thermal expansion coefficient, and have broad application prospects in the aerospace field. In the current spinning process of mesophase pitch fibers, due to the high brittleness of mesophase pitch fibers and the short drawable area of ​​melt spinning, it is extremely difficult to obtain fine-diameter mesophase pitch fiber precursors by continuous drawing. The existing technology mainly reduces the broken filaments caused by the spinning and drawing process through the improvement of the spinning and drawing equipment, which is not easy to bundle and unnecessary damage, and cannot meet the requirements of continuous spinning and finer diamet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D4/02D01D5/16D01D5/088
CPCD01D4/02D01D5/088D01D5/16
Inventor 李鹏飞胡琪孙海成李文泉
Owner 西安天运新材料科技有限公司
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