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Method for preparation of high performance carbon fiber protofilament by blending method

A carbon fiber precursor, high-performance technology, applied in the direction of spinning solution preparation, fiber chemical characteristics, and complete sets of equipment for the production of artificial threads, can solve the problems of poor spinnability, high tensile strength, and small denier of polyacrylonitrile. Achieve the effect of reducing Ballas effect and high fiber strength

Inactive Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing high-performance carbon fiber precursors by blending. Isotacticity and molecular weight, the prepared polyacrylonitrile-based carbon fiber precursor has good uniformity, small fineness and high tensile strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the formula in Table 1, mix high isotacticity and high molecular weight polyacrylonitrile evenly, then add dimethyl sulfoxide, dissolve the polymer in a step-by-step heating method, stir and swell at room temperature at low speed for 2 hours, and then raise the temperature to 40°C at a medium speed Stir and dissolve for 2 hours, then stir and dissolve at a high and uniform speed at 80°C for 48 hours to obtain a polyacrylonitrile spinning solution, and the temperature of the spinning solution is 60°C. The spinning solution is defoamed and filtered at 60°C, and after being metered by a metering pump, it is extruded from the spinneret holes of the spinneret and enters the first coagulation bath with a temperature of 40°C and a DMSO concentration of 80wt%. Then, it is coagulated and formed through a secondary coagulation bath with a temperature of 45°C and a DMSO concentration of 50wt% and a third-stage coagulation bath with a temperature of 50°C and a DMSO conc...

Embodiment 2

[0022] According to the formula in Table 2, mix high isotacticity and high molecular weight polyacrylonitrile evenly, then add dimethyl sulfoxide, dissolve the polymer by heating up in stages, stir and swell at room temperature at low speed for 2 hours, and then raise the temperature to 40°C at a medium speed Stir and dissolve for 2 hours, then stir and dissolve at a high and uniform speed at 80°C for 48 hours to obtain a polyacrylonitrile spinning solution, and the temperature of the spinning solution is 60°C. The spinning solution is defoamed and filtered at 60°C, and after being metered by a metering pump, it is extruded from the spinneret holes of the spinneret and enters the first coagulation bath with a temperature of 40°C and a DMSO concentration of 80wt%. Then, it is coagulated and formed through a secondary coagulation bath with a temperature of 45°C and a DMSO concentration of 50wt% and a third-stage coagulation bath with a temperature of 50°C and a DMSO concentration...

Embodiment 3

[0026] According to the formula in Table 3, mix high isotacticity and high molecular weight polyacrylonitrile evenly, then add dimethyl sulfoxide, dissolve the polymer in a step-by-step heating method, stir and swell at room temperature at low speed for 2 hours, and then raise the temperature to 40°C at a medium speed Stir and dissolve for 2 hours, then stir and dissolve at a high and uniform speed at 80°C for 48 hours to obtain a polyacrylonitrile spinning solution, and the temperature of the spinning solution is 60°C. The spinning solution is defoamed and filtered at 60°C, and after being metered by a metering pump, it is extruded from the spinneret holes of the spinneret and enters the first coagulation bath with a temperature of 40°C and a DMSO concentration of 80wt%. Then, it is coagulated and formed through a secondary coagulation bath with a temperature of 45°C and a DMSO concentration of 50wt% and a third-stage coagulation bath with a temperature of 50°C and a DMSO conc...

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Abstract

The invention relates to a method for preparation of high performance carbon fiber protofilament by blending method. High isotactic polyacrylonitrile and high molecular weight polyacrylonitrile are mixed evenly, and then dissolved in dimethylsulfoxide (DMSO) for the preparation of a polyacrylonitrile spinning solution; then the spinning solution is deaerated, filtered, and measured, then extruded through a spinneret, and solidified for forming by wet spinning in a DMSO aqueous solution in a certain concentration; and high strength polyacrylonitrile based carbon fiber is prepared from nascent fiber by boiling water drafting, washing with water, drying densification and steam stretching. Compared with the prior art, the polyacrylonitrile based carbon fiber protofilament prepared from the high isotactic polyacrylonitrile and the high molecular weight polyacrylonitrile by the blending method has the characteristics of regular structure, less fineness, high strength and the like, and is used in the preparation of high performance carbon fiber.

Description

technical field [0001] The invention belongs to the field of preparation of high-performance carbon fiber precursors, in particular to a method for preparing high-performance carbon fiber precursors by blending high isotacticity and high molecular weight polyacrylonitrile. Background technique [0002] As a reinforcing material, carbon fiber has a series of more excellent properties than other materials. Its mechanical strength can remain stable at high temperatures above 2000°C in an inert environment, and it has high specific strength, high specific modulus, high temperature resistance, Fatigue resistance, corrosion resistance, low density, ablation resistance, conduction of electricity and heat, self-lubrication and many other excellent properties. [0003] In the production process of carbon fiber, the performance of the precursor is the main factor restricting the performance of carbon fiber. The factors affecting the properties of the raw silk mainly include the type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38D01F6/18D01F9/22D01D13/00D01D1/02
Inventor 代永强张力张惠博成煜民金日光
Owner BEIJING UNIV OF CHEM TECH
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