Preparation method of porous ceramic pipe with gradient through hole structure

A technology of porous ceramics and through-holes, applied in the field of porous ceramics, can solve the problems of low strength, easy to cause pollution, unstable structure, etc., and achieve the effects of high strength, easy cleaning and low cost

Inactive Publication Date: 2012-12-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, under the scour of high-pressure liquid or high-speed airflow, this structure is not stable and has low strength
Secondly, this structure is easy to leave a lot of dead space in the process of backwashing and disinfection, creating conditions for the reproduction of bacteria, which is easy to cause pollution in the application of the food industry

Method used

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  • Preparation method of porous ceramic pipe with gradient through hole structure
  • Preparation method of porous ceramic pipe with gradient through hole structure
  • Preparation method of porous ceramic pipe with gradient through hole structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Heat tert-butanol to 50°C to make it liquid, add 3.2g DISPER-BYK163 and 1.6g PVP to 93.6ml tert-butanol (accounting for 1% and 0.5% of ceramic powder respectively ), stirred for 10 minutes, then added 317.6g of alumina powder, and ball milled for 4 hours to prepare a ceramic slurry with a solid content of 40vol%. Then pour the slurry into the copper tube sealed at the bottom. The size of the copper tube is 60mm in outer diameter, 3mm in thickness, and 100mm in length. A plastic hose with an outer diameter of 30mm is inserted in the middle of the slurry as a mold. tube bottom. Cover the outside of the copper tube with dry ice and freeze for 1.5 hours. Remove copper pipe and mold then, the body that freezing obtains is placed in freeze drier and vacuumizes 6 hours, and temperature is set to subzero 50 ℃. The dried green body was put into a muffle furnace and raised to 1700°C at a rate of 2°C / min, and kept for 1h. Finally, an alumina porous ceramic tube with ...

Embodiment 2

[0049] Example 2: Heat tert-butanol to 52°C to make it liquid, add 2.8g DISPER-BYK164 and 1.9g PEG4000 to 109.2ml tert-butanol (1.5% and 1% by weight of ceramic powder respectively ), stirred for 10 minutes, then added 189.6g of mullite powder, and milled for 3 hours to prepare a ceramic slurry with a solid content of 30vol%. Then the slurry is poured into a plastic mold with a closed bottom. The inner diameter of the mold is 60 mm, and a copper tube is inserted in the middle of the slurry. The size of the copper tube is 30 mm in outer diameter, 2.5 mm in thickness, and 100 mm in length. Add 40ml of refrigerated ethanol with a temperature of about -40°C into the copper tube, keep adding dry ice to keep this temperature, and freeze for 1 hour. Remove copper pipe and mold then, and the green body obtained by freezing is placed in freeze drier and vacuumizes for 10 hours, and temperature is set to subzero 50 ℃. The dried green body was put into a muffle furnace and raised to 145...

Embodiment 3

[0050] Embodiment three: tert-butanol is heated to 50 DEG C so that it becomes liquid, and 2.1g DISPER-BYK167 and 1.6g gum arabic are added in 124.8ml tert-butanol (accounting for the proportion of ceramic powder is respectively 2% and 1.5 %), stirred for 10 minutes, then added 107.6g of cordierite powder, and milled for 5 hours to prepare a ceramic slurry with a solid content of 20vol%. Then pour the slurry into the copper tube sealed at the bottom. The size of the copper tube is 50mm in outer diameter, 3mm in thickness, and 100mm in length. A plastic hose with an outer diameter of 30mm is inserted in the middle of the slurry as a mold. tube bottom. The outside of the copper tube is covered with dry ice, then filled with frozen alcohol at a temperature of about -50°C, and frozen for 2 hours. Remove copper tube and mold then, and the green body that freezing is obtained is placed in freeze drier and vacuumizes 12 hours, and temperature is set to subzero 50 ℃. The dried green...

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Abstract

The invention relates to a preparation method of a porous ceramic pipe with a gradient through hole structure. The preparation method is characterized in that the adopted raw materials include freezing medium tertiary butanol, ceramic powder, a dispersing agent, adhesive, a lubricating agent, and refrigerant; and the preparation method comprises the steps of mixing the raw materials based on a certain ratio; freezing and shaping; and sintering at a low temperature of -50 DEG C under an air condition without pressure, thus obtaining the porous ceramic pipe with the gradient through hole structure. The porous ceramic pipe prepared by the method provided by the invention has a radial gradient through hole structure with an axis served as the centre of a circle; and the porous ceramic pipe has the advantages of high strength, high filtration flux, and being easily cleaned. The preparation method is simple in preparation technology, has low requirements on equipment and technological conditions, and is beneficial for being popularized and used.

Description

technical field [0001] The invention relates to the field of porous ceramics, in particular to a method for preparing a porous ceramic tube with a gradient through-pore structure. Background technique [0002] In the 1980s, porous ceramic microfiltration and ultrafiltration separation membranes began to enter the field of industrial applications. Porous ceramic membranes are widely used in liquid separation fields such as chemical industry, food and water treatment, especially for fruit juice, due to their high temperature resistance, chemical and biological corrosion resistance, long service life, easy regeneration, high filtration efficiency, and high mechanical strength. clarification. Organic membranes will destroy the color and taste of fruit juice, while inorganic microfiltration membranes can not only obtain higher permeation flux and retention rate, but also reduce the absorption of protein on the surface of the membrane and reduce the pollution of juice by the memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B38/00C04B35/10C04B35/48C04B35/14C04B35/195C04B35/185
Inventor 汪长安周军
Owner TSINGHUA UNIV
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