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Method for manufacturing doped flexible graphite products

A flexible graphite and manufacturing method technology, applied in the field of flexible graphite product manufacturing, can solve problems such as unevenness of zinc powder or other doped powders, and achieve the effect of improving product performance

Active Publication Date: 2013-12-11
湖北联投恒达石墨有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing doped flexible graphite products, which can solve the problem of uneven zinc powder or other doped powders in the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Zinc powder is coated on the surface of low-density polymer material powder and particles, and the polymer powder coated with zinc powder on the surface is mixed with expandable graphite. The mixed powder expands instantaneously at a high temperature of 850-1200 ° C. Pressing under action to obtain a flexible graphite sheet containing zinc powder.

[0021] Zinc powder refers to commercially available zinc powder with a particle size of 600-2000 mesh, powder or scale, preferably powder; the weight ratio of zinc powder to expandable graphite is 1-5%, and the content of zinc powder is too high It affects the surface smoothness and strength of graphite paper, and the content of zinc powder is too low to achieve corrosion resistance.

[0022] Low-density polymer materials include stearic acid with a density of less than 1.0g / cm3, high softening point paraffin, high softening point pitch, high softening point rosin, methyl cellulose, etc., and the optimized softening point is...

Embodiment 2

[0029] The mixed powder of inorganic fiber powder or acicular mineral powder is coated on the surface of low-density polymer material powder and particles, and the polymer powder coated with zinc powder on the surface is mixed with expandable graphite. Expanded, expanded graphite worms, fibers, and needle-shaped mineral powder are pressed under the action of a graphite paper machine or other pressing machinery to obtain a flexible graphite composite sheet.

[0030] Add inorganic fiber powder and acicular mineral powder to graphite products, and use the same method as in Example 1 to manufacture flexible graphite products.

[0031] The uniformity of fiber or mineral powder doping can be obtained by testing the uniformity of material strength.

Embodiment 3

[0033] Expandable graphite: 100kg

[0034] Zinc powder: 1kg

[0035] Stearic acid: 2.5kg

[0036] Stearic acid is pulverized in a high-speed pulverizer, zinc powder is mixed with stearic acid powder, and then the mixture of zinc powder and stearic acid is poured into the pulverizer for high-speed pulverization and mixing, and the tap density of the mixed product is measured to be 1.09g / cm3.

[0037] Disperse the mixed powder into the expandable graphite and mix for 15-20 minutes. Then the flexible graphite sheet and the composite sheet are prepared according to conventional methods.

[0038] After testing, the zinc powder is evenly distributed in the product.

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Abstract

The invention relates to a method for manufacturing doped flexible graphite products. Metal powder (for example, zinc powder, the inorganic fiber powder or the needle-like mineral powder) is wrapped on granules of a large granular polymer material, so that the specific gravity of the powder is greatly reduced; the polymer material is carbonized or ashed by burning under high temperature; and the meta powder, the inorganic fiber powder or the needle-like mineral powder wrapping the polymer material is dispersed and sedimentated under the generated airflow, then inlaid on fluffy expandable graphite particles and evenly scattered in the products during the subsequent processing, so that the product performance is enhanced. The method solves the problems of non-uniform precipitation and distribution of zinc powder or other doped powders in the doped flexible graphite products in the prior art.

Description

technical field [0001] The invention relates to a method for manufacturing a flexible graphite product, in particular to a method for manufacturing a flexible graphite product doped with zinc powder or other doped powders. Background technique [0002] The general industrial manufacturing method of flexible graphite sheet is to expand the expandable graphite instantaneously at a high temperature of 850-1200 ℃, and then press it under the action of a graphite paper machine or other pressing machinery. The manufacturing method of expandable graphite is obtained by immersing natural flake graphite in an acid solution mixed with sulfuric acid or nitric acid and an oxidizing agent. The flexible graphite sheet produced by this method itself has a high carbon content, and the remaining non-metallic elements have certain corrosiveness to the metal interface. In the hot and humid air environment, this corrosion will seriously affect the sealing performance and sealing performance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 傅云峰
Owner 湖北联投恒达石墨有限公司