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Method for improving carbonization yield of viscose-based carbon felt

A viscose-based, high-temperature carbonization technology, which is applied in the fields of fiber chemical characteristics, chemical post-treatment of rayon, textiles and papermaking, etc., can solve the problems of organoboron compounds that have not been reported, shorten the pre-oxidation time, and enhance the effect of prepreg , the effect of reducing time cost

Active Publication Date: 2021-12-14
因达孚先进材料(苏州)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is no report on organoboron compounds as catalysts

Method used

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  • Method for improving carbonization yield of viscose-based carbon felt

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Effect test

Embodiment 1

[0025] A method for improving the carbonization yield of viscose-based carbon felt, comprising the following steps:

[0026] Step (1) Soak the viscose fiber in the organoboron catalyst for 10 minutes, dehydrate it, and wash it with 40°C pure water for 15 minutes. The preparation method of the organoboron catalyst is as follows: 3 parts of boric acid tris Dissolve isopropyl ester in 30 parts of absolute ethanol, stir evenly, add 1 part of cyanuric chloride, after fully stirring, add 1 part of melamine borate, fully stir and mix evenly, and finally dissolve in 100 parts of absolute ethanol to obtain organoboron Catalysts;

[0027] Step (2) Dry in an oven at 105°C for 120 minutes;

[0028] Step (3) Pre-oxidation: pre-oxidize the dried fibers in a pre-oxidation furnace, pre-oxidize into two temperature zones, the first temperature zone temperature is 200 ° C, the second temperature zone temperature is 220 ° C, pre-oxidation Time: 20 minutes in the first temperature zone, 20 minu...

Embodiment 2

[0031] A method for improving the carbonization yield of viscose-based carbon felt, comprising the following steps:

[0032] Step (1) Soak viscose fiber in organoboron catalyst, use ultrasonic prepreg process, ultrasonic power 80W, dehydrate after ultrasonic 3min at room temperature, wash with 40℃ pure water for 15min, among them, the preparation of organoboron catalyst The method is: in a nitrogen atmosphere protected stirring tank, dissolve 3 parts of triisopropyl borate in 30 parts of absolute ethanol, stir evenly and add 1 part of cyanuric chloride, after fully stirring, add 1 part of boric acid melamine, fully stir and mix homogeneous, then dissolved in 100 parts of absolute ethanol to obtain organoboron catalysts;

[0033] Step (2) Dry in an oven at 105°C for 120 minutes;

[0034] Step (3) Pre-oxidation: pre-oxidize the dried fibers in a pre-oxidation furnace, pre-oxidize into two temperature zones, the first temperature zone temperature is 200 ° C, the second temperatu...

Embodiment 3

[0037] A method for improving the carbonization yield of viscose-based carbon felt, comprising the following steps:

[0038] Step (1) Soak the viscose fiber in an organoboron catalyst for 20 minutes, dehydrate it, and wash it with 50°C pure water for 15 minutes. The preparation method of the organoboron catalyst is as follows: 5 parts of boric acid tris Dissolve isopropyl ester in 30 parts of absolute ethanol, stir evenly, add 2 parts of cyanuric chloride, after fully stirring, add 2 parts of melamine borate, fully stir and mix evenly, and finally dissolve in 100 parts of absolute ethanol to obtain organoboron Catalysts;

[0039] Step (2) drying in an air circulation furnace for 120 minutes;

[0040] Step (3) Pre-oxidation: pre-oxidize the dried fibers in a pre-oxidation furnace, pre-oxidize into two temperature zones, the first temperature zone temperature is 210°C, the second temperature zone temperature is 230°C, pre-oxidation Time: 25 minutes in the first temperature zon...

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Abstract

The invention provides a method for improving the carbonization yield of a viscose-based carbon felt. The method comprises the following steps of (1) soaking viscose in an organic boron catalyst for dehydration, and cleaning with pure water; (2) drying in a drying oven or an air circulation furnace for 120 minutes; (3) performing pre-oxidization: performing pre-oxidation treatment on dried fibers in a pre-oxidation furnace, wherein the pre-oxidation is conducted in two temperature zones, the temperature of the first temperature zone ranges from 200 DEG C to 220 DEG C, the temperature of the second temperature zone ranges from 220 DEG C to 235 DEG C, the pre-oxidation time ranges from 20 min to 30 min for the first temperature zone, and the pre-oxidation time ranges from 20 min to 30 min for the second temperature zone; and (4) performing carbonization: under the protection of a nitrogen atmosphere, carrying out low-temperature carbonization for 12-24 minutes, and carrying out high-temperature carbonization for 18-36 minutes. According to the method, an organic boron compound is used as a dehydration catalyst, so that the pre-oxidation time is shortened, the carbonization yield of viscose-based fibers is finally increased to 30% or above, the energy consumption is greatly reduced, and the yield is increased.

Description

technical field [0001] The invention belongs to the field of high-performance fibers, and in particular relates to a method for increasing the carbonization yield of viscose-based carbon felt. Background technique [0002] The excellent characteristics of viscose-based carbon fiber in heat insulation, heat preservation, and fire resistance make it irreplaceable. Its precursor viscose fiber, the chemical formula is (C 6 h 10 o 5 )n, the carbon content is 44.44%, which is the theoretical carbonization yield, but in production, the carbonization yield is only about 20%. In the actual conversion process, the undehydrated part is converted into L-glucose and tar, and the small molecule volatiles CO and CO 2 , HCOOH, CH 4 etc. will also take away carbon atoms. In particular, the generation of L-glucose and tar not only reduces the carbonization yield, but also causes serious pollution to the fiber, and a large amount of tar is easy to condense inside the furnace body and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/16D01F11/14
CPCD01F9/16D01F11/14
Inventor 李勇赵会钱扬平
Owner 因达孚先进材料(苏州)股份有限公司
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