Method for preparing carbon fibre braided packing

A technology of carbon fiber weaving and carbon fiber bundle, applied in the direction of carbon fiber, fiber treatment, fiber chemical characteristics, etc., can solve the problems of short life, low tensile strength, poor continuity of manufacturing process, etc., and achieve high strength and high modulus Effect

Inactive Publication Date: 2009-03-18
浙江国泰密封材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the products prepared by this preparation method and the current graphite braided packing, when rotating at high pressure and high speed, due to the poor continuity of the manufacturing process of the material itself, the tensile strength is not high, it is easy to wash out during use, and the life under high pressure and high speed It is very short and needs to be replaced frequently, causing the equipment to be shut down freq

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

[0030] Embodiment 1: the preparation method of a kind of carbon fiber braided filler of this example, its steps are:

[0031] a. 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 800°C; high-temperature carbonization is 1250 degrees, and micro-oxygen carbonization The method is to use multi-layer graphite mesh in the high-carbon furnace, and the layer difference is distributed in the nitrogen input port in the high-temperature furnace hall, and on the furnace wall, the inlet and outlet of the furnace are laid with graphite plates and polyacrylonitrile fiber bundles. When the silk is carbonized in the furnace hall, even if there is a trace of oxygen molecules entering, it will be eaten away by the graphite mesh screen or graphite plate nearby, w...

Embodiment 2

[0041] Embodiment 2: the preparation method of a kind of carbon fiber braided filler of this example, its steps are:

[0042] a. The polyacrylonitrile fiber bundles are subjected to constant temperature release, multi-stage pre-oxidation, medium temperature carbonization, and micro-oxygen carbonization to protect high-temperature carbonization; the temperature of medium-temperature carbonization is 830°C; high-temperature carbonization is 1300 degrees, micro-oxygen carbonization The method is to use multi-layer graphite mesh in the high-carbon furnace, and the layer difference is distributed in the nitrogen input port in the high-temperature furnace hall, and on the furnace wall, the inlet and outlet of the furnace are laid with graphite plates and polyacrylonitrile fiber bundles. When the silk is carbonized in the furnace hall, even if there is a trace of oxygen molecules entering, it will be eaten away by the graphite mesh screen or graphite plate nearby, which will not harm ...

Embodiment 3

[0050] Embodiment 3: the preparation method of a kind of carbon fiber braided filler of this example, its steps are:

[0051] a. 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 degrees, and micro-oxygen carbonization The method is to use multi-layer graphite mesh in the high-carbon furnace, and the layer difference is distributed in the nitrogen input port in the high-temperature furnace hall, and on the furnace wall, the inlet and outlet of the furnace are laid with graphite plates and polyacrylonitrile fiber bundles. When the silk is carbonized in the furnace hall, even if there is a trace of oxygen molecules entering, it will be eaten away by the graphite mesh screen or graphite plate nearby, w...

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Abstract

The invention relates to a method for preparing braided packing, in particular to a method for preparing carbon fiber braided packing, which mainly aims to solve problems of causing equipment to be frequently shutdown for inspection and affecting the normal operation of the production due to low tensile strength, easy scouring during the use, short service life, and the need of frequent replacement existing in the prior art. The method also solves the technical problems that certain materials with better strength have no electric conductivity and heat conductivity and can be overheated and burnt when the materials are used under working conditions of high pressure, high temperature and high speed, thereby easily producing dielectric leakage, frequently causing process shutdown, bringing great loss to the production and economy and so on. The method comprises the steps: the adoption of a polyacrylonitrile fiber, constant-temperature filament unwinding, multi-stage pre-oxidation, middle-temperature carbonization, the protection of high temperature carbonization by a micro-oxygen carbon corrosion method, sizing, filament winding, one-step carbon filament pretreatment, pipe inversion, the adjustment of spindle tension, fixed temperature constant control braiding, negative pressure filling and soaking, drying, shaping, inspection, packing and warehouse entry.

Description

technical field [0001] The invention relates to a preparation method of braided packing, in particular to a preparation method of carbon fiber braided packing. Background technique [0002] There are many throttling, supply and discharge devices in industrial equipment, such as pumps, reciprocating shafts, valves, etc. The working parts of these equipments are all required to have a good seal to prevent the internal medium from leaking, and the sealing of the moving parts is often the most likely to fail, especially in some severe working conditions. Often in industrial production, more than 60% of the accidents are related to the lax sealing of equipment and the leakage of internal media. [0003] 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 efficient operation of our equipment. What kind of packing can be used to meet...

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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IPC IPC(8): C09K3/10F16J15/20D01F9/22D06M11/74D06M15/564D06M101/40
Inventor 孙锦龙
Owner 浙江国泰密封材料股份有限公司
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