Preparation method of high-strength alkali-resistant polyacrylonitrile fiber and polyacrylonitrile fiber

A polyacrylonitrile fiber, polyacrylonitrile spinning technology, applied in the chemical characteristics of fibers, wet spinning, drawing spinning and other directions, can solve the problems of low fiber strength, poor alkali resistance, etc., and achieve high performance and alkali resistance. Good properties, improved crystallinity and orientation

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem mainly solved by the present invention is the low fiber strength and poor alkali resistance when polyacrylonitrile fiber / precursor is used for cement matrix reinforcing material, and when it is used for pre-oxidized fiber and carbon fiber precursor, the problem of low strength of the prepared fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]1. Coagulation and drafting: batch copolymerization is adopted, and the spinning stock solution is obtained after the polymerization stock solution undergoes single removal, aging and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.2%, and the solid content is 21.5%; the spinning stock solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.

[0035] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing ...

Embodiment 2

[0041] 1. Coagulation and drawing: Batch copolymerization is adopted, and the spinning stock solution is obtained after the polymerization stock solution undergoes single removal, aging, and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.8%, and the solid content is 21.5%; the spinning stock solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.

[0042] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing...

Embodiment 3

[0048] 1. Coagulation and drafting: batch copolymerization is adopted, and the spinning dope is obtained after the polymerization stock solution undergoes singulation removal, aging, and defoaming. The mass content of acrylonitrile in the stock solution copolymer is 99.4%, and the solid content is 21.5%; the spinning solution is passed through The primary fiber is prepared by wet spinning after accurate metering by the metering pump. The diameter of the spinneret is 65 μm, the number of spinneret holes is 24,000, the aspect ratio is 1.75, and the first coagulation bath is dimethyl sulfoxide aqueous solution with a concentration of 50%. , the temperature is 35°C, and the draw ratio is 0.6; the second coagulation bath and the third coagulation draw ratio are 1.12 and 1.15, respectively.

[0049] 2. Water washing, hot water drawing and one-time oiling: use 3-level hot water drawing, drawing temperature is 80, 90, 95 ℃, drawing ratio is 1.8, 2.0, 2.2 respectively; washing temperatu...

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Abstract

The invention relates to a preparation method of a high-strength alkali-resistant polyacrylonitrile fiber and the polyacrylonitrile fiber. The method comprises the following steps: carrying out spinning, solidification forming, solidification drafting, water washing, hot water drafting, primary oiling, dry densification, steam drafting, steam heat setting, secondary oiling, re-drying and fiber collection on a polyacrylonitrile spinning solution to obtain the polyacrylonitrile fiber, wherein the mass content percentage of acrylonitrile in a polyacrylonitrile copolymer in the polyacrylonitrile spinning solution is 99.2-99.8%; the micropore orientation angle of the fiber subjected to dry densification is less than or equal to 20 degrees by utilizing a small-angle X-ray scattering test. The polyacrylonitrile fiber obtained by the method has the characteristics of high fiber strength and good alkali resistance, and the pre-oxidized fiber and the carbon fiber prepared by taking the polyacrylonitrile fiber as the precursor have high performance, and can be used in industrial production of the polyacrylonitrile fiber.

Description

technical field [0001] The invention relates to the field of acrylonitrile fibers, in particular to a preparation method of high-strength alkali-resistant polyacrylonitrile fibers and the obtained polyacrylonitrile fibers. Background technique [0002] Polyacrylonitrile fiber has acid and alkali resistance, high strength and good color, and can be directly used in clothing, decorations, industry and other fields; in polyacrylonitrile preoxidized fiber and carbon fiber, it has relatively low manufacturing cost and carbonization yield Relatively high and other advantages, it is one of the main raw materials for preparing precursors; in the field of geotechnical construction such as cement mortar and cement concrete, it has relatively good alkali resistance, and it has been widely used as a matrix reinforcement material. [0003] There are many ways to prepare polyacrylonitrile fiber. According to the preparation process, it can be divided into one-step method and two-step meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38D01F9/22D01D10/06D01D10/02D01D5/14D01D5/06
CPCD01F6/38D01F9/22D01D5/06D01D10/06D01D5/14D01D10/02
Inventor 李磊沈志刚赵微微
Owner CHINA PETROLEUM & CHEM CORP
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