Method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending

A technology of polyacrylonitrile fiber and physical blending, applied in the direction of fiber chemical characteristics, synthetic polymer artificial filament chemical post-treatment, melt spinning method, etc., to achieve the effect of eliminating environmental pollution, reducing production cost, and less micropores

Active Publication Date: 2014-08-20
优聚新材料(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for increasing the preoxidation speed of polyacrylonitrile fibers through physical blending. The spinning process of this method is simple, the process is easy to control, the raw material lignin is cheap and easy to obtain, an

Method used

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  • Method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending
  • Method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending
  • Method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending

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Embodiment 1

[0031] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer with a mass ratio of 0:40:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 4.63cN / dtex. spinning fibers. A new type of polyacrylonitrile precursor is pre-oxidized by passing air into a tube furnace, and the air flow rate is 5L min -1 , the pre-oxidation temperature is controlled in five temperature zones (170, 200, 220, 240, 260° C.), and the pre-oxidation 54min to ...

Embodiment 2

[0033] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer at a mass ratio of 10:30:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 4.43cN / dtex. spinning fibers. A new type of polyacrylonitrile precursor is pre-oxidized by passing air into a tube furnace, and the air flow rate is 5L min -1 , the pre-oxidation temperature is controlled in five temperature zones (170, 200, 220, 240, 260°C), and the pre-oxidized yarn with a r...

Embodiment 3

[0035] Mix the lignin, polyacrylonitrile powder and plasticizer vacuum-dried at 60°C for 24 hours in a high-speed rotary mixer at a mass ratio of 15:25:60, and then add the mixture to the twin-screw spinning machine In a closed hopper, blend and melt at 140-220°C to obtain a homogeneously mixed blend melt; pass the thin flow of the blend melt flowing out of the spinneret through the spinning assembly through the hot air at 30°C Shaped, wound at a winding speed of 200m / min to obtain melt-spun fibers; the above-mentioned fibers were further drawn in a water bath, the temperature of the water bath was 60°C, and the total draw ratio was 3 times to obtain a melt-spun fiber with a strength of 5.16cN / dtex. spinning fibers. A new type of polyacrylonitrile precursor is pre-oxidized by passing air into a tube furnace, and the air flow rate is 5L min -1 , the pre-oxidation temperature is controlled in five temperature zones (180, 200, 230, 250, 280°C), and the pre-oxidized yarn with a r...

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Abstract

The invention relates to a method for improving pre-oxidation speed of polyacrylonitrile fiber through physical blending. The method comprises the following steps: performing vacuum drying on polyacrylonitrile, lignin and a plasticizer, and uniformly stirring and mixing, thus obtaining a mixed material; spinning, setting and winding to obtain a melt spun fiber, wherein a mass ratio of polyacrylonitrile to lignin to the plasticizer is (5-30):(10-30):(50-70); and performing water bath drawing on the melt spun fiber, and performing pre-oxidation to obtain the pre-oxidation polyacrylonitrile fiber. The raw material lignin is low in cost and slight in environmental pollution and is suitable for industrial production; lignin contains lots of hydroxyl groups which can achieve hydrogen-bond interaction with a polar group cyano on a polyacrylonitrile molecular chain, and lignin and polyacrylonitrile have high compatibility; moreover, the oxygen content in the lignin structure is high, the oxygen can be released in the pre-oxidation process, a uniform oxygen source is provided for an oxidation reaction of a polyacrylonitrile precursor, and a prepared pre-oxidation thread sheath-core is small in difference and dense and uniform in structure.

Description

technical field [0001] The invention belongs to the field of modification of polyacrylonitrile fibers, in particular to a method for increasing the preoxidation speed of polyacrylonitrile fibers through physical blending. Background technique [0002] The industrial goals of carbon fiber production are to reduce costs, improve carbon fiber performance and production efficiency. Shortening the pre-oxidation time is the key to reducing the production cost of carbon fiber, but the short time will aggravate the skin-core structure, and large voids and defects are likely to occur in the carbonization stage, resulting in a decrease in the mechanical properties of carbon fiber. Lowering the pre-oxidation temperature and prolonging the pre-oxidation time, the skin-core structure of the pre-oxidized fiber is not obvious, which is beneficial to improve the performance of carbon fiber, but reduces the production efficiency. Therefore, an excellent pre-oxidation process has not been st...

Claims

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Application Information

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IPC IPC(8): D01F8/08D01F8/18D01F1/10D01F11/06D01F9/22D01D5/08D01D1/04D01D5/14D01D10/02
Inventor 余木火陈磊刘淑萍郑颖韩克清
Owner 优聚新材料(浙江)有限公司
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