Production process for preparing expandable graphite by electrolytic method

A technology of expanded graphite and production process, applied in chemical instruments and methods, inorganic chemistry, other chemical processes, etc., can solve the problems of high sulfur content and low expansion ratio of expandable graphite, and achieve high expansion ratio and increase expansion ratio. , Improve the effect of adsorption and infiltration

Active Publication Date: 2021-04-13
鹏柯(海南)投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a production process for preparing expandable graphite by electrolysis to solve the problems of low expansion ratio and high sulfur content of expandable graphite prepared in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A production process for preparing expandable graphite by electrolysis, comprising the following steps:

[0034] (1) select 60 purpose graphite for use, mass concentration is the sulfuric acid of 83%, additive a, additive b, described additive a is made up of octyl oleate, trioctyl trimellitate by mass ratio as 1: 7, described additive b is composed of methacrylate and n-octadecanyl propionate in a mass ratio of 4:3, metal electrode plates are used as positive and negative electrodes, and the mass ratio of graphite, sulfuric acid, additive a, and additive b is 1:1.9:0.02 : 0.07, the current density in the electrolytic cell is 35mA / cm 2 , electrolyzed for 5.8h to obtain a mixture;

[0035] (2) deacidifying the mixture prepared in step (1) to obtain the deacidified mixture;

[0036] (3) The deacidified mixture prepared in step (2) was soaked and washed with water for 2.6 hours using water containing additive c, wherein the additive c was composed of acetic acid and pent...

Embodiment 2

[0039] A production process for preparing expandable graphite by electrolysis, comprising the following steps:

[0040] (1) select 70 purpose graphite for use, mass concentration is the sulfuric acid of 95%, additive a, additive b, described additive a is made up of octyl oleate, trioctyl trimellitate by mass ratio as 2: 9, described additive b is composed of methacrylate and n-octadecanyl propionate in a mass ratio of 5:3, metal electrode plates are used as positive and negative electrodes, and the mass ratio of graphite, sulfuric acid, additive a, and additive b is 1:2:0.03 : 0.06, the current density in the electrolytic cell is 60mA / cm 2 , electrolyzed for 4h to obtain a mixture;

[0041] (2) deacidifying the mixture prepared in step (1) to obtain the deacidified mixture;

[0042](3) The deacidified mixture prepared in step (2) was soaked and washed with water for 2.8 hours by using water containing additive c, wherein the additive c was composed of acetic acid and pentae...

Embodiment 3

[0045] A production process for preparing expandable graphite by electrolysis, comprising the following steps:

[0046] (1) select 80 purpose graphite for use, mass concentration is the sulfuric acid of 88%, additive a, additive b, described additive a is made up of octyl oleate, trioctyl trimellitate by mass ratio as 1: 10, described additive b is composed of methacrylate and n-octadecanyl propionate in a mass ratio of 7:2, metal electrode plates are used as positive and negative electrodes, and the mass ratio of graphite, sulfuric acid, additive a, and additive b is 1:2.1:0.02 : 0.07, the current density in the electrolytic cell is 68mA / cm 2 , electrolyzed for 3.2h to obtain a mixture;

[0047] (2) deacidifying the mixture prepared in step (1) to obtain the deacidified mixture;

[0048] (3) Soak and wash the deacidified mixture prepared in step (2) for 3 hours with water containing additive c, which is composed of acetic acid and pentaerythritol stearate in a mass ratio of...

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PUM

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Abstract

The invention discloses a production process for preparing expandable graphite by an electrolytic method. The process comprises the following steps: (1) selecting graphite, sulfuric acid, an additive a and an additive b, and electrolyzing for 3-6 hours at the current density of 30-70mA/cm<2> in an electrolytic bath to obtain a mixture; (2) deacidifying the mixture to obtain a deacidified mixture; (3) soaking and washing the deacidified mixture with water containing an additive c for 2.5-3 h, and then dehydrating to obtain a dehydrated mixture; and (4) drying the dehydrated mixture at the temperature of 180-200 DEG C to obtain the expandable graphite. The expandable graphite is extremely high in expansion ratio, can be applied to seal and flame retardance of polyurethane, engineering plastics and rubber, and has good economic and social benefits.

Description

【Technical field】 [0001] The invention belongs to the technical field of preparing expandable graphite, and in particular relates to a production process for preparing expandable graphite by electrolysis. 【Background technique】 [0002] Natural flake graphite is an overlapping structure of hexagonal network planes of carbon atoms. The bonding force between layers is weak, and it is easy to insert heterogeneous atoms, ions, and molecules between graphite layers, and form graphite interlayer compounds with carbon atoms. If this compound If it can be heated and decomposed, and instantly become gas and dissipated, then the graphite crystal will expand in the C-axis direction, and expandable graphite with a multiple of 100-200 can be obtained. This expanded graphite is pressed into a sheet or strip, which is called soft Graphite, can be used as sealing material and shielding material. [0003] Generally, the methods for preparing expanded graphite mainly include chemical methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225C08K7/24C08L75/04C08L21/00C08L101/00C09K3/10
CPCC08K7/24C08L21/00C08L75/04C08L101/00C08L2201/02C09K3/10C09K2003/1037C01B32/225
Inventor 王海鹏
Owner 鹏柯(海南)投资有限公司
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