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Efficient pre-oxidation method for general-grade asphalt-based non-woven felt

A pre-oxidation, pitch-based technology, applied in the direction of textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of compacted oxidized felt and low pre-oxidation efficiency, and achieve the effect of avoiding fusion and improving efficiency

Pending Publication Date: 2022-03-11
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a high-efficiency pre-oxidation method for general-purpose asphalt-based non-woven mats, through the up-and-down alternating hot air circulation pre-oxidation method, to solve the low pre-oxidation efficiency of general-purpose asphalt-based non-woven felt pre-oxidation furnaces in the prior art And the technical problem that the oxide felt is compacted

Method used

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  • Efficient pre-oxidation method for general-grade asphalt-based non-woven felt
  • Efficient pre-oxidation method for general-grade asphalt-based non-woven felt
  • Efficient pre-oxidation method for general-grade asphalt-based non-woven felt

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no. 1 example

[0028] as attached figure 1 , attached figure 2 And attached image 3 Shown, the efficient pre-oxidation method of a kind of general grade asphalt-based non-woven mat, comprises the following steps:

[0029] Step 1: The thickness of the precursor of the general-purpose asphalt non-woven felt 1 that needs to be pre-oxidized is 9cm, and the width is 45cm. A multi-stage pre-oxidation furnace is used. The total length of the pre-oxidation furnace is 60 meters. The length is 1.5m, the running speed of the network chain 2 in the pre-oxidation furnace is controlled to 0.5m / min, and the pre-oxidation time in the pre-oxidation furnace is 2h;

[0030] Step 2: The pre-oxidation furnace is a multi-section combined type, each section has an independent hot air heating and hot air circulation system, and the hot air circulation volume of each section in the pre-oxidation furnace is set to 500m 3 / h;

[0031] Step 3: Divide the temperature of the pre-oxidation furnace into four zones: S...

no. 2 example

[0035] The second embodiment of the present invention is similar to the first embodiment except for the following design changes. A high-efficiency pre-oxidation method for a general-purpose asphalt-based non-woven felt, comprising the steps of:

[0036] Step 1: The thickness of the general-grade asphalt raw silk that needs to be pre-oxidized is 9cm, and the width is 45cm. A multi-stage pre-oxidation furnace is used. The total length of the pre-oxidation furnace is 60 meters. Control the speed of the network chain in the pre-oxidation furnace 0.5m / min, the pre-oxidation time in the pre-oxidation furnace is 2h;

[0037] Step 2: The pre-oxidation furnace is a multi-section combined type, each section has an independent hot air heating and hot air circulation system, and the hot air circulation volume of each section in the pre-oxidation furnace is set to 880m 3 / h;

[0038] Step 3: Divide the temperature of the pre-oxidation furnace into four zones: Sections 1-10 of the pre-ox...

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Abstract

The invention discloses an efficient pre-oxidation method of a general-grade pitch-based non-woven felt in the technical field of carbon fiber production, and the efficient pre-oxidation method adopts a multi-section pre-oxidation furnace to control the operation speed, the hot air circulation amount and the pre-oxidation time of a network chain in the pre-oxidation furnace; the temperature of the pre-oxidation furnace is divided into four zones, namely a low-temperature zone, a slow oxidation zone, a rapid oxidation zone and a cooling zone, hot air in the low-temperature zone and the slow oxidation zone circulates from bottom to top, hot air in the rapid oxidation zone circulates from top to bottom, and hot air in the cooling zone circulates from bottom to top; the oxygen content of the pitch-based non-woven felt after pre-oxidation is controlled, the pre-oxidized fiber is placed in a carbonization furnace to be carbonized according to the set temperature programming, the universal pitch-based carbon fiber is prepared, the efficient pre-oxidation method is simple in process, good in controllability and efficient in pre-oxidation, and the pre-oxidation time is shortened.

Description

technical field [0001] The invention relates to the technical field of carbon fiber production, in particular to a high-efficiency pre-oxidation method for a general-grade pitch-based non-woven felt. Background technique [0002] Since the development of pitch-based carbon fibers, pitch-based carbon fibers have become a very important type in the field of carbon fibers. At present, they have replaced viscose-based carbon fibers and become the second largest category of carbon fibers after PAN-based carbon fibers. Pitch-based carbon fibers In the production process, the pre-oxidation process is a very critical and important step. The effect of pre-oxidation is directly related to the quality of carbon felt. The efficiency of pre-oxidation also directly determines the manufacturing cost of carbon fiber and carbon felt. Pre-oxidation The method can be summarized into liquid phase method and gas phase method. The liquid phase method uses strong oxidants such as nitric acid, sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/32
CPCD01F9/322
Inventor 袁绪路陈炜盛乔瑜单长春张超万胜
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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