Method for manufacturing large-specification carbon graphite sealing material matrix

A technology of sealing materials and carbon graphite, which is applied in the field of preparation of large-scale carbon graphite sealing material substrates, can solve the problems of not meeting the specifications of large-scale equipment sealing devices, product specifications cannot be enlarged, and the process is complicated, so as to reduce the number of carbonization, Effect of increasing density and reducing porosity

Active Publication Date: 2016-07-20
HUNAN CHANGYU NEW CARBON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then make secondary coke powder, and then go through pressing and carbonization-impregnation treatment. This process takes a long time. The process of heat treatment to control the amount of asphalt coating to regulate the pores of the sealing material matrix is ​​relatively complicated, and the product specification cannot be enlarged to meet the specification requirements of large-scale equipment sealing devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of embodiment of the preparation method of large-scale carbon graphite sealing material matrix of the present invention, comprises the following steps:

[0031] (1) Preparation of secondary carbon black powder and modified asphalt slurry

[0032] The carbon black was pulverized by air flow until the particle size (D50) was 5 μm to 6 μm, then 30 kg of carbon black powder was fed into the vacuum kneader, and the cover was opened and mixed at 170 ° C for 1 h, and the modified bitumen in a molten state of 185 ° C (softening point 115°C) 12kg, close the machine cover, control the temperature at 190°C, control the positive speed of the kneader at 30r / min, vacuumize and knead for 2 hours, and put the paste out of the pot after kneading into the machine while it is hot. Make it into a cylindrical shape at not lower than 150°C, then raise the temperature for carbonization (the highest temperature reaches 1100°C), cool to room temperature after carbonization, and obtain se...

Embodiment 2

[0041] A kind of embodiment of the preparation method of large-scale carbon graphite sealing material matrix of the present invention, comprises the following steps:

[0042] (1) Preparation of secondary carbon black powder and modified asphalt slurry

[0043] The carbon black was pulverized by air flow until the particle size (D50) was 5 μm to 6 μm, and then 30 kg of carbon black powder was fed into the vacuum kneader, and the lid was opened and mixed at 150 ° C for 1 h, and the modified pitch (softening point (115°C) 10kg, close the machine cover, control the temperature at 175°C, control the reverse speed of the kneader at 20r / min, vacuumize and knead for 2 hours, and put the paste out of the pot after kneading into the machine while it is hot. Make it into a cylinder at a temperature not lower than 150°C, then raise the temperature for carbonization (the maximum temperature reaches 1000°C), cool to room temperature after carbonization, and obtain secondary carbon black pow...

Embodiment 3

[0052] A kind of embodiment of the preparation method of large-scale carbon graphite sealing material matrix of the present invention, comprises the following steps:

[0053] (1) Preparation of secondary carbon black powder and modified asphalt slurry

[0054] The carbon black was pulverized by air flow until the particle size (D50) was 5 μm to 6 μm, and then 30 kg of carbon black powder was fed into the vacuum kneader, and the lid was opened and mixed at 160 ° C for 1 h, and the modified asphalt (softening point 115°C) 15kg, close the machine cover, control the temperature at 200°C, control the forward and reverse rotation speed of the kneader at 25r / min, vacuumize and knead for 2 hours, put the paste out of the pot after kneading into the machine while it is hot, and Turn it into a cylinder at a temperature not lower than 160°C, then raise the temperature for carbonization (the maximum temperature reaches 1150°C), cool to room temperature after carbonization, and obtain seco...

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Abstract

A method for manufacturing a large-specification carbon graphite sealing material matrix comprises the following steps that 1, carbon black and modified pitch are subjected to mixing and pinching, lump making and carbonizing treatment, secondary carbon black powder is obtained, a dispersing agent and modified pitch are mixed and stirred, and modified pitch slurry is obtained; 2, coke powder, graphite powder and the secondary carbon black powder are mixed, mixed powder is obtained, then the mixed powder and the modified pitch slurry are subjected to mixing and pinching, flaking and smashing, flakes are obtained, mesocarbon microbeads and the obtained flakes are mixed, and mixed aggregate is obtained; 3, the mixed aggregate is subjected to isostatic compaction treatment, and green blanks are obtained after demolding; 4, the green blanks are calcined and carbonized, and the carbon graphite sealing material matrix is obtained.The method for manufacturing the large-specification carbon graphite sealing material matrix is short in machining period and low in production cost, and the obtained carbon graphite sealing material matrix has the advantages of being large in specification, high in strength and the like.

Description

technical field [0001] The invention relates to the technical field of carbon-graphite sealing materials, in particular to a method for preparing a large-scale carbon-graphite sealing material matrix. Background technique [0002] As one of the important sealing materials in chemical industry, energy, machinery, nuclear industry and other industries, carbon graphite sealing material has self-lubrication, high temperature resistance, corrosion resistance, easy processing, good wear resistance, good impact resistance, low thermal expansion coefficient Good performance such as high efficiency, possessing the common advantages of metal materials and non-metal materials, so it is widely used in bearings, piston rings, sealing rings, pump and valve parts, explosion-proof devices, etc. [0003] The main raw materials for the production of carbon graphite sealing material matrix are coke, natural or artificial graphite, carbon black, etc., and the density and strength of the raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/634C04B35/64C04B35/626
CPCC04B35/532C04B35/62605C04B35/63496C04B35/64C04B2235/424C04B2235/425C04B2235/656C04B2235/77C04B2235/96
Inventor 杨程刘金平
Owner HUNAN CHANGYU NEW CARBON MATERIALS
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