Method for preparing foamed ceramics by surfactant hydrophobic modification of dispersant

A surfactant and hydrophobic modification technology, which is applied to ceramic products, other household utensils, household utensils, etc., to achieve the effects of wide applicability, high controllability of foam structure, and strong process practicability

Active Publication Date: 2017-03-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at many problems existing in the solidification of foam slurry in the process of preparing foam ceramics by the existing slurry foaming method, the present invention provides a method for preparing foam ceramics with a surfactant hydrophobically modified dispersant, comprising:

Method used

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  • Method for preparing foamed ceramics by surfactant hydrophobic modification of dispersant
  • Method for preparing foamed ceramics by surfactant hydrophobic modification of dispersant
  • Method for preparing foamed ceramics by surfactant hydrophobic modification of dispersant

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Prepare ceramic slurry: use alumina powder with median particle size D50=450nm as raw material, use ultrapure water as solvent, use ammonium polyacrylate as dispersant, and the amount of dispersant added is 0.3wt. %, prepared by ball milling uniformly dispersed, solid content of 50vol.% ceramic slurry;

[0042] (2) Hydrophobic modified dispersant: add 0.05wt.% (relative to powder mass) dodecyltrimethylammonium chloride to the slurry, and continue ball milling for 20 minutes;

[0043] (3) Mechanical stirring and foaming: the above-mentioned ceramic slurry is mechanically stirred and foamed, the speed of the stirrer is 1000 rpm, and the mechanical stirring is foamed for 2 minutes;

[0044] (4) Curing and drying of the foam slurry: inject the above foam slurry into a porous metal mold lined with paper, place it at room temperature for 12 hours, demould, and then dry at room temperature for 48 hours;

[0045] (5) Sintering: heat the foamed ceramic green body at 1550°C ...

Embodiment 2

[0047] The preparation process is similar to Example 1, the difference is that 0.0375wt.% (relative to the powder mass) dodecyltrimethylammonium chloride is added to the slurry, and the slurry is placed at room temperature for 5 hours after pouring and then demolded. dry. The resulting alumina foam ceramics, such as Image 6 Shown in (b).

Embodiment 3

[0049] The preparation process is similar to that of Example 1, except that 0.025wt.% (relative to the powder mass) dodecyltrimethylammonium chloride is added to the slurry, and the slurry is placed at room temperature for 7 hours after pouring and then demolded. dry.

[0050] Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) show respectively the microstructure figure that embodiment 1, embodiment 2, embodiment 3 prepare alumina foam ceramics, as can be seen, the prepared by this process The pore structure of alumina foam ceramics is complete and dense, and the pore size distribution of the pores becomes wider as the amount of surfactant decreases. The porosities of the foamed ceramics prepared in Examples 1-3 were 82%, 77%, and 76%, respectively.

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Abstract

The invention relates to a method for preparing foamed ceramics by surfactant hydrophobic modification of a dispersant, comprising the following steps: (1) dispersing ceramic powder by the use of a polyelectrolyte dispersant so as to form water-based ceramic slurry, and controlling solid content of the water-based ceramic slurry to 30-60 vol.%; (2) adding a surfactant into the water-based ceramic slurry and carrying out hydrophobic modification on the polyelectrolyte dispersant by the use of the surfactant so as to obtain hydrophobically modified ceramic slurry; and (3) carrying out mechanical agitation and foaming on the hydrophobically modified ceramic slurry to obtain foam slurry, injecting into a mold, carrying out in-situ solidification on the foam slurry at room temperature, demoulding, drying and sintering to prepare the foamed ceramics. According to surface physicochemical characteristics of ceramic powder, a proper polyelectrolyte dispersant is selected; and the dispersant is adsorbed on the surface of particles so as to perform dual effects of steric hindrance and electrostatic repulsion.

Description

technical field [0001] The invention relates to a method for preparing foamed ceramics, more precisely, a method for preparing foamed ceramics by utilizing the mutual attraction between molecules of a hydrophobically modified dispersant and ceramic particles to realize in-situ solidification of foamed slurry. Background technique [0002] Foamed ceramics have a wide range of applications in thermal insulation, filtration, catalysis, and medical implants. Ceramic slurry foaming is a main method for preparing foamed ceramics. It has the characteristics of simple process equipment, green environmental protection, and strong practicability, and has important research and application values. [0003] The foaming of ceramic slurry involves two key steps in the preparation of ceramic foam, one is the introduction of gas, and the other is the curing of the foam slurry. Mechanical agitation and foaming is a commonly used gas introduction method, that is, the gas is introduced into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/634C04B35/632C04B35/10C04B38/10
CPCC04B35/10C04B35/632C04B35/634C04B35/63444C04B38/10C04B2235/3244C04B2235/3418C04B2235/3826C04B2235/3873C04B38/0074
Inventor 赵瑾王士维岛井骏藏周国红张海龙
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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