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Method for preparing foamed ceramic through hydrophobic flocculation

A technology of foam ceramics and water flocculation, which is applied to ceramic products, other household utensils, household utensils, etc. It can solve the problems of complicated process operation and many types of organic matter addition, and achieve the effect of simple process, good fluidity and low viscosity

Active Publication Date: 2017-01-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the many problems in the preparation of foam ceramics by the existing mechanical foaming method, especially the need to add different organic substances to stabilize and solidify the foam respectively, resulting in many types of organic substances and complicated process operations, the present invention provides a method for preparing foam by hydrophobic flocculation Ceramic methods, including:

Method used

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  • Method for preparing foamed ceramic through hydrophobic flocculation
  • Method for preparing foamed ceramic through hydrophobic flocculation
  • Method for preparing foamed ceramic through hydrophobic flocculation

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preparation example Construction

[0041] Preparation of foam slurry. Specifically, the water-based ceramic slurry uniformly dispersed with the surfactant is mechanically stirred and foamed to obtain a foamed slurry. Wherein, the mechanical foaming is stirring for 1 to 5 minutes at a rotation speed of 600 to 2000 revolutions / minute. In the present invention, the hydrophobically modified particles can act as a particle stabilizer to stabilize foam.

[0042] Preparation of foam body. Specifically, the above-mentioned foam slurry is injected into a mold for forming, and cured (in-situ curing at room temperature), demolded, and dried to obtain a foam body. In the present invention, the foam slurry after mechanical stirring and foaming is injected into a porous vented mold and placed at room temperature. Under the mutual hydrophobic interaction between the hydrophobic particles, flocculation and coagulation are generated, and the mold can be demolded after 24 hours, thereby obtaining a certain strength Ceramic foam ...

Embodiment 1

[0047] (1) Preparation of slurry: use alumina powder with median particle size D50=450nm as raw material, use ultrapure water as solvent, and use 1mol / L HCl to adjust the pH value of the slurry (pH=5); prepare dispersion by ball milling Uniform ceramic slurry with a solid content of 30vol.%;

[0048] (2) Hydrophobic modification: add 0.1 wt.% (relative to the mass of the powder) dodecyl sulfate triethanolamine to the slurry, and continue ball milling for 10 minutes;

[0049] (3) Stirring and foaming: transfer the above hydrophobically modified ceramic powder slurry to a measuring cup, adjust the speed of the stirrer to 1000 rpm, and mechanically stir and foam for 2 minutes;

[0050] (4) Injection molding and curing: Inject the foam slurry into a porous metal mold lined with paper, leave it for 24 hours, demold, and dry at room temperature for 48 hours;

[0051] (5) Sintering: the foam ceramic green body is kept at 1550°C for 2 hours, and then cooled with the furnace to obtain alumina ...

Embodiment 2

[0053] The preparation process is similar to that of Example 1, except that 0.17 wt.% (relative to the mass of the powder) dodecyl sulfate triethanolamine is added to the slurry.

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Abstract

The invention relates to a method for preparing foamed ceramic through hydrophobic flocculation. The method comprises the steps that the solid content is controlled to be 15-50 vol.%, the pH value of water-based ceramic slurry is regulated to enable the surface of ceramic powder to be electrically charged so as to be uniformly dispersed in an electrostatic repulsion mode; surfactant of which an electric charge type is opposite to that of the ceramic powder surface is added into the water-based ceramic slurry, stirring or ball-mill mixing is conducted to enable the surfactant to be uniformly dispersed or adsorbed on the ceramic powder surface, and surfactant modified partially-hydrophobic ceramic slurry is obtained; the partially-hydrophobic ceramic slurry is subjected to mechanical stirring foaming, foam slurry is directly injected into a mold, the room-temperature in-situ solidification, then demoulding and drying are conducted, and after sintering is conducted, the foam ceramic is obtained. According to the method, by means of electrostatic repulsion, ceramic particles in the slurry reach a good dispersion effect, and the water based ceramic slurry which is low in viscosity and good in flowability is obtained.

Description

Technical field [0001] The invention relates to a method for preparing foam ceramics, more specifically to a method for preparing ceramic foams by hydrophobically modified ceramic particles with surfactants and using hydrophobic flocculation to achieve in-situ curing, and is particularly suitable for preparing foams with high porosity and closed pores ceramics. Background technique [0002] Foam ceramics are an important type of porous ceramics, which have the characteristics of high porosity, wide pore size distribution and adjustable pore penetration. They are widely used in thermal insulation, filtration, catalysis and other fields. Mechanical stirring and foaming is a main method for preparing foam ceramics. It has the characteristics of simple process equipment, environmental protection, and strong practicability, and has important research and application value. [0003] To prepare foam ceramics by mechanical stirring and foaming, first add a dispersant to prepare a ceramic ...

Claims

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Application Information

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IPC IPC(8): C04B38/10C04B35/10C04B35/63C04B35/632
CPCC04B35/10C04B35/6303C04B35/632C04B38/10C04B2235/6022C04B2235/96
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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