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Method for lowering ash content of polyacrylonitrile-based carbon fiber

A polyacrylonitrile-based carbon fiber and carbon fiber technology, applied in the chemical characteristics of fibers, chemical post-processing of synthetic polymer rayon filaments, textile/flexible product manufacturing, etc., can solve the problem of not effectively reducing the ash content of carbon fibers, and achieve dense structure The effect of high chemical degree, low ash content and high density

Inactive Publication Date: 2013-09-11
XIAN KANGBEN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are domestic patent applications on ash content testing and analysis of ash content. For example, Wang Weixia et al. studied the structural form and chemical composition of PAN-based raw silk and carbon fiber ash in the 2012 "Synthetic Fiber" Volume 41 No. 3, and analyzed the source of ash content. and influencing factors, it is concluded that there is a linear relationship between the ash content of the raw silk and the ash content of the carbon fiber, and that the type of oil agent and the oiling rate are the main factors affecting the ash content, but there is no introduction on how to effectively reduce the ash content of the carbon fiber

Method used

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  • Method for lowering ash content of polyacrylonitrile-based carbon fiber

Examples

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Embodiment 1

[0037] This embodiment is a method for reducing the ash content of polyacrylonitrile-based carbon fibers, and the specific process is:

[0038] The first step is the preparation of PAN-based protofilaments.

[0039] The preparation of the PAN-based protofilament provides the following steps:

[0040] Step 1, preparation of spinning solution. With acrylonitrile, methyl acrylate, itaconic acid, 2-acrylamide-2-methylpropanesulfonic acid and initiator azobisisobutyronitrile as the solute and dimethyl sulfoxide as the solvent, it is obtained by conventional preparation methods reaction solution. The weight ratio of described acrylonitrile, methyl acrylate, itaconic acid, 2-acrylamide-2-methylpropanesulfonic acid is 98.00:0.75:1.00:0.25; The concentration of azobisisobutyronitrile in solute is 0.9 wt%. The concentration of the solute in the reaction solution was 21.6 wt%.

[0041] The obtained reaction solution was polymerized by a conventional method in a polymerization tank, ...

Embodiment 2

[0064] This embodiment is a method for effectively reducing the ash content of PAN-based precursors and carbon fibers.

[0065] The specific process includes two steps. The first step is the preparation of PAN-based raw silk: including the preparation and filtration of the spinning solution, the coagulation and molding of the spinning solution, the washing of the coagulated filaments, the hot water drawing of the washed silk, and the washing of the washed silk. The first oiling, the first drying and densification, the second oiling, the second drying and densification, the third oiling, and subsequent treatment; the second step is the preparation of PAN-based carbon fibers. The specific process of this embodiment is the same as that of Example 1, wherein the coagulation and shaping of the spinning solution, the water washing of the coagulated filaments, the hot water drafting of the water-washed silk, the first oiling of the water-washed silk, and the second coating The parame...

Embodiment 3

[0084] This embodiment is a method for effectively reducing the ash content of PAN-based precursors and carbon fibers.

[0085] The specific process includes two steps. The first step is the preparation of PAN-based raw silk: including the preparation and filtration of the spinning solution, the coagulation and molding of the spinning solution, the washing of the coagulated filaments, the hot water drawing of the washed silk, and the washing of the washed silk. The first oiling, the first drying and densification, the second oiling, the second drying and densification, the third oiling, and subsequent treatment; the second step is the preparation of PAN-based carbon fibers. The specific process of this embodiment is the same as that of Example 1, wherein the coagulation and shaping of the spinning solution, the water washing of the coagulated filaments, the hot water drafting of the water-washed silk, the first oiling of the water-washed silk, and the second coating The parame...

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Abstract

The invention discloses a method for lowering ash content of polyacrylonitrile-based carbon fiber. A PAN (Polyacrylonitrile) spinning solution with higher hydrophilism is prepared on the basis of a quaternary ammoniated modification copolymerization system. A PAN-based raw silk with high structural compaction degree, good mechanical performance and low ash content is prepared by virtue of key control of swelling capacity before applying oil agent on the raw silk, introducing a low-silicon oil agent and controlling the oil content of the silk flock. The carbon fiber ash content and the raw silk ash content have linear relation, and are matched with a certain charring process for charring the raw silk to obtain the carbon fiber with low ash content.

Description

technical field [0001] The invention relates to a method for reducing the ash content of polyacrylonitrile-based carbon fibers. Background technique [0002] Polyacrylonitrile (PAN)-based carbon fiber has comprehensive excellent properties such as light weight, high strength, high modulus, thermal conductivity, high temperature resistance, corrosion resistance, and low expansion. It is the mainstream of current research and development, production, and application, and is an ideal ablation-resistant functional composite The components of materials and structural composite materials play an increasingly important role in high-tech aerospace fields such as satellites, launch vehicles, spacecraft (space shuttles), and civil aircraft, and are an important basis for the sustainable development of the national economy. supplies. [0003] As an item of carbon fiber performance test, ash refers to the residual inorganic matter after the fiber is incinerated at high temperature, mai...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F11/06
CPCY02P70/62
Inventor 刘建军张善营石磊党晓波李靖宇
Owner XIAN KANGBEN MATERIAL
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