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Process for preparing porous ceramic materials

A technology of porous ceramics and pore size is applied in the field of preparation of porous ceramic materials to achieve the effects of controllable size, shortened preparation time and low energy consumption

Active Publication Date: 2006-07-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main principle is to use the first-stage membrane emulsification to prepare a primary emulsion with a wide particle size distribution under jet conditions; then use the primary emulsion as a dispersed phase to press through the membrane pores again under jet conditions to obtain smaller particle sizes. Monodisperse emulsions, but how to control the particle size of emulsion droplets, and how to apply this technology in the preparation process of non-polar / polar emulsions, and how to prepare porous ceramic materials from the obtained emulsions have not been reported

Method used

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  • Process for preparing porous ceramic materials
  • Process for preparing porous ceramic materials

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The flow chart of the preparation method of porous ceramics based on membrane jet emulsification technology is as follows: figure 1 shown. Ceramic membranes with an average pore diameter of 0.16 μm and 1.5 μm were respectively used as the emulsification medium for the two emulsifications, and a stirrer was used as a shear force providing device, and the stirring speed was 490 rpm. The primary membrane emulsification process uses isooctane as the dispersed phase, block polymer poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) and formamide as the continuous phase, block polymer and formamide The weight ratio is 0.02. Under the pressure of 0.09MPa, the dispersed phase is pressed through the membrane pores, and the flux of the dispersed phase is 100L / (m 2 h). figure 2 This is an optical microscope photo of the prepared primary emulsion. It can be seen from the figure that the emulsion droplets are not uniform. With the primary emulsion as the dispersed ...

Embodiment 2

[0028] Ceramic membranes with an average pore size of 0.16 μm and 1.5 μm were used as the emulsification medium for the two emulsifications respectively, and a pump was used as a shear force provider, and the membrane surface flow velocity was 0.4 m / s. The primary membrane emulsification process uses kerosene as the dispersed phase, N,N-dimethylformamide and Span 60 as the continuous phase, and the weight ratio of nonionic surfactant to formamide is 0.01. Under the pressure of 0.2MPa, the dispersed phase is pressed through the membrane pores, and the flux of the dispersed phase is 220L / (m 2 h). With the primary emulsion as the dispersed phase, under the pressure of 0.25MPa, the flux of the secondary membrane emulsification process can reach 250L / (m 2 h). The average particle diameter of the prepared emulsion was 1.6 μm. Disperse the emulsion into the formamide sol of tetrabutyl titanate, add the destabilizing agent ethylamine to the mixed sol to convert the sol into a gel, ...

Embodiment 3

[0030] Disperse the emulsion prepared in Example 1 into the formamide sol of tetrabutyl titanate, apply the sol on a ceramic substrate with a pore size of 50-1000 nm, and destabilize the sol through capillary action, so that the sol is transformed into Gel, the gel is aged and stripped at 70°C. After stripping the template, a porous gel is formed, and then heated and baked at 400°C for 20 hours. The obtained series of gradient pore materials, the top layer of TiO 2 The average pore size of the ceramic is 1.0 μm.

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Abstract

The invention relates to a method of preparing porous ceramic material, especially relates to a bore diameter control method by film fluid jet emulsify technique, mainly applying to the preparation of ceramic material with regular pore construction. The specific technical project is as follows: a method of preparing porous ceramic material, is characterized by: use film fluid jet emulsify technique to control and prepare mono-disperse non-polar / polar emulsion, which means: the disperse phase flows into continuous phase through fenestra of film emulsified medium and form primary emulsion in the condition of shearing force; take said primary emulsion as discontinuous phase, which flows into continuous phase in the condition of fluid jet through fenestra and forms mono-disperse emulsion; take said emulsion as mold and disperse it into non-hydrosol which changes into gel through instable poly-condensation; the gel after leaving plate is burned to get high-ordered porous ceramic material.

Description

technical field [0001] The invention relates to a method for preparing a porous ceramic material, in particular to a method for controlling the pore size of a ceramic material through a film jet emulsification technology, which is mainly applied to the preparation of a ceramic material with a regular pore structure. Background technique [0002] In the field of material chemical engineering, the preparation of structural and functional materials with regular and ordered channels is the basis for the development of many new unit processes and reactions, such as the suspension nano-catalysis reaction process developed based on ceramic membrane materials and the selection based on ZSM-5 molecular sieves. type catalytic technology. In order to control the pore structure of materials, scholars in the fields of materials, chemistry, and chemical engineering have developed methods such as thermally induced phase separation, chemical etching, photolithography, and templates. Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/624C04B35/64
Inventor 徐南平景文珩邢卫红薛业建
Owner NANJING UNIV OF TECH
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