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Preparation method of highly carbonized fiber woven filler

A technology of fiber weaving and high carbonization, which is applied in the fields of carbon fiber, fiber processing, textiles and papermaking, and can solve problems such as short life, poor continuity of manufacturing process, and affecting normal production operation

Inactive Publication Date: 2012-05-23
张孟福
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of high-carbon fiber braided packing, which solves the existing problems in the prior art due to the poor continuity of the manufacturing process of the material itself, the low tensile strength, easy erosion during use, and high pressure and high speed. The life is very short and needs to be replaced frequently, causing the equipment to be shut down frequently for inspection, which affects the normal operation of production; it also solves the problem that the material with relatively strong strength does not have electrical and thermal conductivity, and it is under high-pressure, high-temperature, and high-speed working conditions. When in use, due to the frictional heat energy generated by the rotating motion, it cannot be conducted out, so it will cause overheating, burning, and medium leakage will easily occur, which will seriously cause process shutdown and bring a lot of losses to the production economy. question

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation method of a kind of high carbon fiber filler of this example, its steps are:

[0034] 1. The polyacrylonitrile fiber bundles are subjected to constant temperature unwinding, multi-stage pre-oxidation, medium temperature carbonization, and micro-oxygen carbonation method to protect high-temperature carbonization; the low-temperature carbonization temperature is 450°C, and the medium-temperature carbonization temperature is 850°C; high-temperature carbonization is 1450°C ℃, the micro-oxygen carbon etching method is to use multi-layer activated carbon mesh in the high-carbon furnace. When activated carbon and polyacrylonitrile fiber bundles are carbonized in the furnace, even if a small amount of oxygen molecules enter, they will be eaten away by the activated carbon screen or activated carbon plate nearby, and will not involve harmful carbon filaments.

[0035] 2. Sizing and collecting the product of the previous step to obtain carbon fiber b...

Embodiment 2

[0041] Embodiment 2: a kind of preparation method of highly carbonized fiber braided packing, its steps are:

[0042] 1. The polyacrylonitrile fiber bundles are sequentially subjected to constant temperature unwinding, multi-stage pre-oxidation, medium temperature carbonization, and micro-oxygen carbonization to protect high-temperature carbonization; the temperature of medium-temperature carbonization is 850°C; high-temperature carbonization is 1450°C, and micro-oxygen carbonation The method is to use multi-layer activated carbon nets in the high-carbon furnace, and the layer difference is distributed in the oxygen input port in the high-temperature furnace hall, and on the wall of the furnace hall, the inlet and outlet of the furnace hall are laid with activated carbon, polyacrylonitrile When the fiber bundles are carbonized in the furnace hall, even if there are traces of oxygen molecules entering, they will be eaten away by the activated carbon screen or activated carbon pl...

Embodiment 3

[0049] Embodiment 3: a kind of preparation method of carbon fiber braided packing, its steps are:

[0050] 1. The polyacrylonitrile fiber bundles are sequentially subjected to constant temperature unwinding, multi-stage pre-oxidation, medium temperature carbonization, and micro-oxygen carbonization to protect high-temperature carbonization; the temperature of medium-temperature carbonization is 850°C; high-temperature carbonization is 1400°C, and micro-oxygen carbonation The method is to use multi-layer activated carbon nets in the high-carbon furnace, and the layer difference is distributed in the oxygen input port in the high-temperature furnace hall, and on the wall of the furnace hall, the inlet and outlet of the furnace hall are laid with activated carbon, polyacrylonitrile When the fiber bundles are carbonized in the furnace hall, even if there are traces of oxygen molecules entering, they will be eaten away by the activated carbon screen or activated carbon plate nearby,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a preparation method of highly carbonized fiber woven fillers, relating to a preparation method of woven fillers. A polyacrylonitrile fiber wire bundle is processed sequentially through constant-temperature wire discharging, multi-section pre-oxidation, medium-temperature carbonization and high-temperature carbonization in a microaerobic carbon corrosion method; wherein the temperature of the low-temperature section pre-oxidation is 238-280 DEG C, and the temperature of the medium-temperature carbonization is 900-550 DEG C; and nitrogen is adopted as a carbon wire protection gas in the microaerobic carbon corrosion method, and the temperature of the high-temperature carbonization is 1450-1700 DEG C. The prepared highly carbonized fiber woven fillers has good self-lubricating performance, high strength, high modulus, good resistance against high temperature, low temperature and corrosion and good thermal conductivity, can be used for a long time in mediums with particle fluid and in rotation of high linear speed, and can also be used to replace the existing filler products of all materials.

Description

Technical field: [0001] The invention relates to a preparation method of braided packing, in particular to a preparation method of high-temperature carbonized fiber braided packing. Background technique: [0002] There are many throttling, supply and discharge devices in industrial equipment, such as high-temperature pumps, high-pressure reciprocating pumps, high-temperature and high-pressure valves, etc. The working parts of these devices require good sealing to prevent the internal medium from leaking outwards, and the sealing of the moving parts is often the most prone to leakage, especially in some harsh working conditions. In industrial production, more than 60% of the accidents are related to the leakage of internal medium caused by the lax sealing of equipment. Especially for dynamic sealing under complex working conditions such as high temperature, high pressure, high speed, and strong corrosion, it is difficult to find an ideal packing product to ensure the efficie...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/02D02G3/26D01F9/22D06M11/74D06M101/40
Inventor 张孟福
Owner 张孟福
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