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Spinnable asphalt and preparation method thereof

A pitch and coal tar pitch technology, applied in the field of spinnable pitch and its preparation, can solve the problems of increasing the production process of spinnable pitch and complicating the production of spinnable pitch, achieving narrow melting range, high softening point, and simplified preparation process Effect

Inactive Publication Date: 2020-04-14
西安郎格飞博科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, separate petroleum asphalt and coal tar pitch need to add modifiers in the thermal condensation polymerization process. Since the modifiers are obtained by processing various raw materials, the use of modifiers will increase the production process of spinnable pitch. , which complicates the production of spinnable pitch

Method used

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  • Spinnable asphalt and preparation method thereof

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Effect test

Embodiment 1

[0039] Another embodiment of the present invention is a method for preparing spinnable asphalt, comprising the following steps:

[0040] Step S1, using medium and low temperature coal tar pitch with an ash content ≤ 0.2 wt% as raw material, preparing medium and low temperature coal tar pitch based refined pitch. The specific method for preparing medium and low temperature coal tar pitch-based refined pitch is as follows:

[0041] Step S1.1: Grinding the medium and low temperature coal tar pitch to a size smaller than 20 meshes to obtain powdered medium and low temperature coal tar pitch.

[0042] Step S1.2, extracting the powdered medium-low temperature coal tar pitch with tetrahydrofuran to obtain a first extract; in the extraction, the weight ratio of medium and low temperature coal tar pitch to tetrahydrofuran is 1:4˜1:10.

[0043] Step S1.3, after filtering the first extract, recover the tetrahydrofuran therein to obtain the first soluble component. Wherein, the filtrati...

Embodiment 1

[0053] The softening point is 88°C, the ash content is 0.2wt% medium and low temperature coal tar pitch is crushed to ≤20 mesh, mixed with tetrahydrofuran at a mass ratio of 1:4, the soluble components of medium temperature coal tar pitch are extracted and filtered, and after vacuum drying for 12 hours, tetrahydrofuran is soluble Mix the mixture with toluene at a mass ratio of 1:4, recover the toluene, and dry in vacuum for 12 hours to obtain refined asphalt with an ash content of 0.02wt% and a softening point of 73°C.

[0054] Mix the obtained refined asphalt with petroleum asphalt with a softening point of 98°C and an ash content of 0.02wt% at a ratio of 1:4 (weight ratio), put it into the reactor, and continuously feed nitrogen at a rate of 15mL / min·g , heated to 390°C at a heating rate of 9°C / min, and stayed for 8 hours.

[0055] The obtained spinnable pitch has a softening point of 198°C, a softening melting range of 198-208°C, and a single yield of 66.0%. The spinnable ...

Embodiment 2

[0057] Grind medium-low temperature coal tar pitch (softening point: 86°C, ash content 0.2wt%) to ≤20 mesh, mix with tetrahydrofuran at a mass ratio of 1:8, extract and filter out the soluble components of medium-temperature coal tar pitch, and vacuum-dry for 12 hours. The mass ratio of soluble matter and toluene was mixed at 1:8, the toluene was recovered, and after vacuum drying for 12 hours, refined asphalt with an ash content of 0.01wt% and a softening point of 77°C was obtained.

[0058] Mix the obtained refined asphalt with petroleum asphalt (softening point: 105°C, ash content: 0.02wt%) at a ratio of 1:2 (weight ratio), put it into the reactor, and continuously feed it at a rate of 30mL / min·g Nitrogen, heated to 400°C at a heating rate of 5°C / min, and stayed for 7 hours.

[0059] The obtained spinnable pitch has a softening point of 204°C, a softening melting range of 204-222°C, and a single yield of 57.0%. The spinnable pitch is melt spun at 265°C, the spinning pressu...

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Abstract

The invention discloses spinnable asphalt and a preparation method thereof, wherein the spinnable asphalt comprises the following raw materials in parts by weight: 20-50 parts of medium and low temperature coal pitch-based refined asphalt and 50-80 parts of petroleum asphalt. The preparation method comprises the following steps: uniformly mixing 20-50 parts by weight of medium and low temperaturecoal pitch-based refined asphalt and 50-80 parts by weight of crushed petroleum asphalt, and putting the mixture into a reactor; and introducing inert gas into the reactor under normal pressure, heating to 370-450 DEG C at a speed of 2-9 DEG C / min, and reacting for 4-9 hours to obtain spinnable asphalt. According to the invention, high aromaticity is provided through refined asphalt, the aromaticcomponents and the asphaltene in petroleum asphalt are combined to provide a small amount of aromatic rings, and saturated components and colloid provide alkyl side chains and naphthenic structures, so that the high-quality spinnable asphalt having high softening point and narrow melting range and capable of continuously spinning can be obtained, the petroleum asphalt is used for replacing a modifier, and the preparation technological process of the spinnable asphalt can be simplified.

Description

【Technical field】 [0001] The invention belongs to the technical field of spinnable asphalt preparation, and in particular relates to a spinnable asphalt and a preparation method thereof. 【Background technique】 [0002] Spinnable asphalt synthesis is the most important factor determining the quality of pitch carbon fiber. Pitch carbon fiber has properties such as light weight, high modulus, high temperature resistance, acid and alkali corrosion resistance, and excellent electrical and thermal conductivity. It is the basic material for many civil, industrial, and aerospace applications. . [0003] At present, the method of preparing spinnable pitch generally uses coal tar pitch or petroleum pitch. However, separate petroleum asphalt and coal tar pitch need to add modifiers in the thermal condensation polymerization process. Since the modifiers are obtained by processing various raw materials, the use of modifiers will increase the production process of spinnable pitch. , whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/00
CPCC10C3/005
Inventor 不公告发明人
Owner 西安郎格飞博科技有限公司
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