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Method for preparing pitch-based carbon fiber

A pitch-based carbon fiber and pitch technology, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of high requirements for production equipment and process level, narrow application range of viscose-based, and high requirements for equipment precision, and achieves high raw material quality. Rich, avoid line breakage, good yield and quality effect

Active Publication Date: 2013-11-27
内蒙古隆通碳纤维技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscose base has a narrow application range and extremely small output; the PAN base has the characteristics of mature technology and large output, but the production cost of this line is high, the technology is difficult, the requirements for equipment precision are high, and the emission of highly toxic cyanide is serious. Problem: The asphalt-based line has obvious advantages such as rich raw materials, good quality, large output, safety and environmental protection, and is the development direction of carbon fiber in the future. However, due to the high requirements for production equipment and process level, the asphalt-based line is difficult to realize industrialization production, unable to meet the needs of my country's rapid development

Method used

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Examples

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preparation example Construction

[0020] A preparation method of pitch-based carbon fiber, comprising the following steps:

[0021] 1. Use the molecular distillation method to distill medium-temperature pitch for 0.5-2 hours to obtain low-QI coal tar pitch.

[0022] In this step, medium-temperature asphalt is used as raw material, the medium-temperature asphalt has a QI value of less than 0.3%, a softening point of 80-120°C, a coking value of more than 46%, a TI value of more than 12%, and no sodium ions. The specific process of the molecular distillation method is: add a certain quality of medium-temperature asphalt into the molecular still through the circulation pump, the circulation rate is 400-600ml / min, the vacuum negative pressure is 0.01-0.1MPa, and the initial distillation temperature is 130- Distillation is carried out at 180°C and the temperature difference between distillation and condensation is 40-80°C. During the distillation process, the temperature is continuously raised at a rate of 2-6°C / min...

Embodiment 1

[0029] (1) Add a certain amount of medium-temperature asphalt to the molecular still through a circulation pump, the circulation rate is 450ml / min, distill under a vacuum negative pressure of 0.099MPa, the distillation start temperature is 140°C, and the heating rate is 2°C / min , The temperature difference between distillation and condensation is 70°C. When the temperature rises to 310°C, there is no obvious distillate after about 85 minutes. The distillation stops and the residue is removed to obtain low QI coal tar pitch.

[0030] (2) Under the condition of 220°C, use air as the oxidant to oxidize the low-QI coal tar pitch, and the oxidation time is 5 hours;

[0031] (3) Under the conditions of 280°C and 0.08MPa, the oxidized bitumen is subjected to thin film distillation for 2 hours to remove light components;

[0032] (4) Under the condition of 310°C, melt-spin the bitumen after removing light components;

[0033] (5) Use air to pre-oxidize the as-spun fibers at 280°C for...

Embodiment 2

[0036] (1) Add a certain amount of medium-temperature asphalt to the molecular still through a circulation pump, the circulation rate is 450ml / min, distill under a vacuum negative pressure of 0.099MPa, the distillation start temperature is 140°C, and the heating rate is 2°C / min , The temperature difference between distillation and condensation is 70°C. When the temperature rises to 310°C, there is no obvious distillate after about 85 minutes. The distillation stops and the residue is removed to obtain low QI coal tar pitch.

[0037] (2) Under the condition of 240°C, use air as the oxidant to oxidize the asphalt, and the oxidation time is 6 hours;

[0038] (3) Under the conditions of 290°C and 0.09MPa, the oxidized bitumen is subjected to thin-film distillation for 2.5 hours to remove light components;

[0039] (4) Under the condition of 320°C, melt-spin the bitumen after removing light components;

[0040] (5) Use air to pre-oxidize the as-spun fiber at 300°C, and the oxidati...

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Abstract

The invention relates to a method for preparing a pitch-based carbon fiber, comprising the following steps of: (1) distilling medium-temperature pitch by a molecular distillation method for 0.5-2 h, so as to obtain coal pitch low in QI; (2) performing oxidization treatment on the coal pitch low in QI by using air as an oxidant at the temperature of 200-300 DEG C; (3) performing thin-film distillation on the oxidized pitch at the temperature of 300-350 DEG C and under vacuum negative pressure of 0.05-0.09MPa, so as to remove light components; (4) performing melt spinning on the pitch without the light components at the temperature of 300-350 DEG C; (5) performing pre-oxidization on the nascent fiber by using the air, wherein the oxidization temperature is 150-450 DEG C, while the oxidization time of is 1-3 hours; and (6) performing carbonization on the pre-oxidized fiber at the temperature of 600-1800 DEG C and under the protection of nitrogen, so as to obtain pitch-based carbon fiber products. The method for preparing the pitch-based carbon fiber is reasonable in design, and has the advantages of being rich in raw materials, simple in processing process, low in cost, good in yield and quality, high in yield, safe and environmental-friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon fiber preparation, and in particular relates to a preparation method of pitch-based carbon fiber. Background technique [0002] Carbon fiber is widely used in civil and defense products due to its superior properties. Pitch-based carbon fiber also has unique application characteristics, mainly in the use of ultra-high temperature insulation materials, which can withstand high temperatures of 3000 degrees Celsius, and is irreplaceable in the use of insulation materials for polysilicon and special steel heat treatment furnaces; for the production of carbon fiber composite materials, Use its electrical / thermal conductivity to make organic polymer resin engineering materials have corresponding electrical / thermal conductivity; for special heat insulation and sound insulation materials, such as using its ultra-light specific gravity and electrical conductivity, it can be used on spacecraft and high-speed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/15
Inventor 遇秉武
Owner 内蒙古隆通碳纤维技术有限公司
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