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Method for preparing flexible graphite granules

A flexible graphite and particle technology, which is applied in the field of flexible graphite preparation, can solve problems such as single use, and achieve the effects of improving composite properties, improving performance and increasing the scope of use.

Inactive Publication Date: 2011-03-30
殷国忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is: aiming at the problem of single use of existing expanded graphite due to the preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] The use of expandable graphite has the following four steps:

[0015] a. Graphite high-temperature expansion: add expandable graphite and diesel spray to the expansion furnace for expansion;

[0016] b. Vermicular forming: a worm-shaped forming port is provided at the outlet of the puffing furnace, and the expanded graphite is extruded at the worm-shaped forming port by pressure to form a worm-like shape;

[0017] c. Exhaust and squeeze through the tapered screw feeding device;

[0018] d. High-pressure cluster granulation: the worm-like expanded graphite is squeezed and clustered through a funnel-shaped cluster device, and the clustered graphite is then formed into a strip with a cross-sectional area and a circumference of φ3mm by hydraulic forming. The pressure of the hydraulic forming roller is set to 120T-200T double-roller extreme pressure, the strips are cut and granulated, the particle length is 2.5mm, the particles are sieved, and the particle size is 5-36 mesh...

Embodiment 2

[0020] The use of expandable graphite has the following four steps:

[0021] a. Graphite expansion: add expandable graphite and diesel spray to the expansion furnace for expansion;

[0022] b. Vermicular forming: a worm-shaped forming port is provided at the outlet of the puffing furnace, and the expanded graphite is extruded at the worm-shaped forming port by pressure to form a worm-like shape;

[0023] c. Exhaust and squeeze through the tapered screw feeding device;

[0024] d. High-pressure cluster granulation: the worm-like expanded graphite is extruded and clustered through a tapered screw feeding device, and the clustered graphite is then formed into a strip with a cross-sectional area and a circumference of φ3mm by hydraulic forming. The pressure of the hydraulic forming roller is set at 120T-200T, the strips are cut and granulated, the particle length is 5mm, the particles are sieved, and the particles with a particle size of 5-36 mesh are the finished product.

Embodiment 3

[0026] The use of expandable graphite has the following four steps:

[0027] a. Graphite expansion: add expandable graphite and diesel spray to the expansion furnace for expansion;

[0028] b. Vermicular forming: a worm-shaped forming port is provided at the outlet of the puffing furnace, and the expanded graphite is extruded at the worm-shaped forming port by pressure to form a worm-like shape;

[0029] c. Exhaust and squeeze through the tapered screw feeding device;

[0030] d. High-pressure cluster granulation: the worm-like expanded graphite is squeezed and clustered through a tapered screw feeding device, and the clustered graphite is then formed into a strip with a cross-sectional area and a circumference of 3mm by hydraulic forming. The pressure of the hydraulic forming roller is set at 120T-200T, the strips are cut and granulated, and the particles are crushed and then mixed with a binder and a wear reducing agent. The amount of the binder added is 7% of the total mas...

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Abstract

The invention relates to the technical field of the preparation of flexible graphite and relates to a method for preparing flexible graphite granules. In the method, expandable graphite is adopted. And the method comprises the following four steps of: a, expanding the graphite, namely adding the expandable graphite and diesel spray into an expanding furnace to perform expansion; b, performing vermiform forming, namely forming a vermiform forming opening at an outlet of the expanding furnace, and extruding the expanded graphite at the vermiform forming opening to form a vermiform shape; c, performing exhaust extrusion by a tapered screw type feeder; and d, pelletizing through bundling under high pressure, namely performing extrusion bundling on the expanded vermiform graphite through a funneled bundling device, allowing the bundled graphite to form a stick of which the sectional area perimeter phi is between 1.5 and 3 millimeters through a hydraulic forming pair roller, and cutting the stick and pelletizing to form 5 to 36-mesh granules. By the method, the problem of single purpose caused by the preparation method of the original expandable graphite is solved, and the problem that expandable graphite paper is easy to drop and crack in finished products of brake sheets due to the utilization of the original expandable paper and the problem that the original expandable paper is so thin that other rigid materials penetrate to coupling surface and cause noise in the braking process are solved.

Description

technical field [0001] The invention relates to the technical field of preparation of flexible graphite. Background technique [0002] Flexible graphite, also known as expanded graphite, is a new type of mechanical friction sealing material that not only has the corrosion resistance, high and low temperature resistance and self-lubricating properties of natural flake graphite, but also has flexibility, compressibility and resilience. 80-200 times more than natural flake graphite as raw material, after oxidation (acidification) treatment by concentrated sulfuric acid, concentrated nitric acid and other strong oxidants, washed with water, filtered, dried, and then rapidly heated and expanded at a high temperature of 800-1200°C , that is to obtain a flexible graphite material product in the required form of floc. Existing expanded graphite is generally only used to make graphite paper for cylinder gaskets and the like, but it cannot really be used to make particles of flexible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 殷国忠
Owner 殷国忠
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