KR960033538A - Method for producing active composite material based on expanded graphite - Google Patents

Abstract

The present invention comprises the steps of preparing the expanded graphite powder; Pre-densification of the powder; Impregnation using a solution comprising a reactive salt and a wetting agent, preferably at atmospheric pressure; Drying step; And a method for producing an active composite material based on expanded graphite, particularly for chemical heat pumps or gas treatment devices, comprising a supplemental densification step. The present invention can continuously and rapidly produce active composites with significantly improved performance over the prior art.

[Selectivity] Figure 1

Description

Method for producing active composite material based on expanded graphite

Since this is an open matter, no full text was included.

Claims (32)

Preparing expanded graphite powder; Predense the expanded graphite powder to obtain a preform having a predetermined intermediate density and thickness; Impregnating the preform into an impregnation solution comprising an active agent, a solvent, and a humectant; Drying the preform; Supplementally densifying the preform to form a base composite material having a predetermined final density and thickness. The method of claim 1 wherein the expanded graphite is obtained from natural graphite. The method according to claim 1 or 2, wherein the expanded graphite powder is produced continuously. 3. Method according to claim 1 or 2, characterized in that said preliminary means for densification is selected from compression, rolling and rolling in the mold. The method according to claim 4, wherein the intermediate density is 0.01 to 0.1, the intermediate thickness is 1 to 30 mm when the preliminary densification is by rolling or rolling, and the intermediate thickness is 30 to 1000 mm when the preliminary densification is by compression. Method characterized in that. The method according to claim 4, wherein the intermediate density is 0.02 to 0.07, the intermediate thickness is 1 to 30 mm when the preliminary densification is by rolling or rolling, and the intermediate thickness is 30 to 1000 mm when the preliminary densification is by compression. Method characterized in that. The method of claim 1 or 2, wherein the impregnation step is carried out by dipping in a container containing the solution. The method according to claim 1 or 2, characterized in that the impregnation step is carried out by ejection or spraying or by suction movement of the solution. 8. The method of claim 7, wherein said impregnation is carried out at atmospheric pressure. The method of claim 8 wherein said impregnation is carried out at atmospheric pressure. The method of claim 1 or 2, wherein the solvent is selected from polar solvents that provide solubility so that the active agent can provide a predetermined active agent concentration in the active composite material. The known graphite wetting agent according to claim 1 or 2, wherein the wetting agent maintains solubility in a solvent and, under the temperature and pressure, can impregnate the preform deeply and uniformly with the desired type of impregnation for the process. It is selected from. 12. The method of claim 11, wherein the humectant is selected from polyalcohols, polyfluorine compounds, and polysiloxanes. The method according to claim 1 or 2, characterized in that the drying means is selected from a static or shielded furnace or a dryer. 3. Method according to claim 1 or 2, characterized in that the supplemental densification means is selected from compaction, rolling and rolling in the mold. The final density of graphite is 0.07 to 0.6, the final thickness is 0.5 to 20 mm when the densification is by rolling or rolling, and the intermediate thickness is 20 to 100 mm when the densification is by compression. Method characterized in that. The method of claim 1 or 2, wherein the supplemental densification step forms a diffusion conduit network by any known method. The method of claim 1 or 2, further comprising: precutting the preform by any method known in the art; And / or penetrating the diffusion aperture in any known manner; And / or penetrating the collecting hole in any known manner; And / or preliminary densification by means of a supplementary step into the initial mold which comprises the formation of voids and / or holes and / or grooves of varying lengths and shapes and of various lengths and shapes, in any known manner. Treating the preform produced in the step. The method of claim 1 or 2, further comprising: cutting the preform by any known method; And / or penetrating the diffusion aperture in any known manner; And / or penetrating the collecting hole in any known manner; And / or impregnating with a supplemental mold comprising forming voids and / or holes and / or grooves of varying lengths and shapes and in any known manner, transverse or non-transverse. And / or treating the impregnated preforms produced in the drying step. The method according to claim 1 or 2, characterized in that the impregnation step, the drying step, the densification step and optionally several steps of the mold are carried out. 3. The method of claim 1 or 2, further comprising: passing through the diffusion holes of the composite in any known manner; And / or penetrating the collecting hole in any known manner; And / or cutting by any known method to obtain a semi-finished product of a given grade and / or specific form; And / or coating the semi-finished product with a layer of porous material such as a fabric, mat or carbon paper, glass or other material that is resistant to gas at the operating temperature of the solid-gas reaction apparatus; And / or forming a supplemental densification step with a supplemental manufacturing step comprising forming voids and / or holes and / or grooves of various lengths and shapes in any manner known in the art, transverse or non-crossing. Treating the base composite to obtain a semi-finished product. 3. The final product according to claim 1, wherein the semi-product produced in the densification step or the replenishment manufacturing step is treated with a replenishment collection step comprising loading a semi-product and optionally a porous material element. How to. 22. The load of claim 21, wherein the loading is carried out between the screw and the two plates with rings, or through tightening or bonding with the aid of materials, glass or carbon fiber wicks resistant to gases and operating temperatures of the solid-gas reaction apparatus. Characterized in that for strengthening. 21. The method of claim 20, wherein the semi-products generated in the densification step or supplemental manufacturing step are treated with a collection step comprising semi-product winding and optionally inserting onto a mandrin. 22. The method of claim 21, further comprising: penetrating the diffusion aperture of the article in any known manner; And / or a replenishment step which comprises cutting by any known method to obtain a predetermined grade and / or specific form of the active composite material, the refining step of treating the product produced in the collection step by the replenishment step. How to feature. The method according to claim 24, wherein the final diameter of the diffusion holes on the product or semi-product is 0.1 to 5 mm, and the number of diffusion holes is 1 to 100 / cm 2. The process according to claim 1 or 2, wherein the preparation step, preliminary densification step, impregnation step, drying step, supplemental densification step and optionally the step of preparing and / or the preparation step and / or the collecting step of the expanded graphite powder are carried out. Characterized in that it is carried out in a conventional process. 27. The method of claim 26, wherein said preliminary densification step and supplemental densification step are carried out by rolling. The process according to claim 1 or 2, wherein the preparation step and the preliminary densification step of the expanded graphite powder are carried out in succession, the impregnation step, the drying step, the replenishment densification step, and optionally into the mold and / or the order of the preparation step. The method characterized in that carried out. 29. The method of claim 28, wherein said preliminary densification step is carried out by rolling. 18. The process according to claim 17, wherein the debris by cutting is crushed and recycled upstream of the preliminary densification step. The process according to claim 1 or 2, wherein the steps of preparing the expanded graphite powder are carried out continuously, the preliminary densification step and the supplemental densification step are carried out under compression, the impregnation step, the drying step and optionally into the mold and / or Or in the order of manufacturing steps. ※ Note: The disclosure is based on the initial application.