A kind of preparation method of multilayer gradient ceramic membrane

A technology of ceramic membranes and ceramic membrane supports, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of uneven thickness of the membrane layer, thickness of the membrane layer, etc., achieve uniform pore size distribution, increase filtration flux, porosity enhancement effect

Active Publication Date: 2017-07-14
湖南科一环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the screen printing technology to effectively control the thickness of each film layer, and solves the technical problems that the film layer prepared by the dip coating method is relatively thick and the film layer prepared by the spray coating method is uneven in thickness

Method used

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  • A kind of preparation method of multilayer gradient ceramic membrane
  • A kind of preparation method of multilayer gradient ceramic membrane
  • A kind of preparation method of multilayer gradient ceramic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation method of described a kind of multilayer gradient ceramic membrane, specifically:

[0029] (1) The plastic clay with a mass content of alumina of 60% is formed into a flat ceramic membrane support body with a width of 300 mm, a length of 1024 mm, and a thickness of 8 mm by a vacuum agent process, and after drying, the surface and edges are polished to smooth and flat ;

[0030] (2) Fully mix alumina with silica, calcium oxide, magnesia, carboxymethyl cellulose, polyvinyl alcohol and water, and prepare alumina mass content of 75% (average particle diameter 3 microns), 85 % (average particle size 2 microns), 95% (average particle size 1.5 microns) and 99% (average particle size 1 micron) of ceramic film paste for screen printing; of which carboxymethyl cellulose and polyvinyl alcohol The total consumption is 3% of the total mass of solid matter (aluminum oxide and oxide auxiliary agent), and the particle size and proportioning ratio of alumi...

Embodiment 2

[0038] Embodiment 2: the preparation method of described a kind of multilayer gradient ceramic membrane, specifically:

[0039] (1) The plastic clay with a mass content of alumina of 80% is formed into a flat ceramic membrane support body with a width of 240mm, a length of 512mm and a thickness of 6mm by a vacuum process, and after drying, the surface and edges are polished to be smooth and flat ;

[0040] (2) Fully mix alumina, silicon dioxide, calcium oxide, barium oxide, dextrin, polyvinyl alcohol and water, and prepare alumina mass content of 85% (average particle size 3 microns), 90% respectively (average particle diameter 2 microns), 95% (average particle diameter 1 micron) and 99% (average particle diameter 0.5 micron) ceramic film slurry that can be screen printed; Wherein the total consumption of dextrin and polyvinyl alcohol is 5% of the total mass of solid matter (alumina and oxide additives), the particle size and proportioning ratio of alumina and oxide additives...

Embodiment 3

[0046] Embodiment 3: the preparation method of described a kind of multilayer gradient ceramic membrane, specifically:

[0047](1) the plastic clay of the ceramic membrane support body with alumina mass content being 92% is formed into a wide 130mm, long 512mm, thick 5mm flat plate hollow structure ceramic membrane support body with a vacuum agent process, after drying, the surface and Edges are ground to a smooth finish;

[0048] (2) Alumina, silicon dioxide, magnesia, barium oxide, hydroxypropyl cellulose and polyvinyl alcohol, and water are fully mixed and uniformly prepared as alumina with a mass content of 95% (average particle diameter of 2 microns) ), 97% (average particle size 1 micron) and 99% (average particle size 0.3 micron) ceramic membrane slurry for screen printing; wherein the total amount of hydroxypropyl cellulose and polyvinyl alcohol is solid matter ( 2% of the total mass of aluminum oxide and oxide additives), the particle size and proportioning ratio of ...

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Abstract

A method for preparing a multi-layer gradient ceramic membrane. The method is to print ceramic membrane slurries with different chemical compositions and particle sizes on a flat ceramic membrane support body by screen printing technology, and then co-fire them once. Multilayer gradient ceramic membranes with different chemical compositions and pore structures are formed on the surface of the body. The thickness of the single-layer film can be controlled within the range of 10 microns to 30 microns by using screen printing technology, and the thickness is uniform, which effectively overcomes the technical problem of thicker film layers in the dipping method and uneven thickness in the spraying method. The multilayer gradient ceramic membrane is composed of more than three layers of membrane materials with different chemical composition and particle composition, so it has different thermal expansion coefficients, porosity and average pore diameter, which better alleviates the problem caused by the difference in expansion coefficient between the support body and the membrane layer. The thermal stress generated by the matching surface increases the bonding strength between the membrane layer and the support body and the filtration flux of the membrane layer. The multilayer gradient ceramic membrane has long service life, low preparation cost, energy saving and environmental protection.

Description

technical field [0001] The invention relates to a preparation technology of a ceramic membrane, and further refers to a preparation method of a multilayer gradient ceramic membrane. Background technique [0002] Ceramic membranes have been widely used in sewage treatment, drinking water purification, high-temperature flue gas treatment, filtration of atmospheric particles (such as PM2.5) and dust collection, and have played an important role in environmental protection. However, it also exposed many problems in the application process, mainly: [0003] 1. Since the ceramic membrane support body and the ceramic membrane layer usually need to be fired twice, the bonding strength between the ceramic membrane layer and the support body is not high, and the ceramic membrane is prone to fall off and fail during recoil. [0004] 2. Thermal stress is generated between the support body and the film layer due to the mismatch of expansion coefficient, which affects the bonding strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/06B01D69/10B01D67/00C02F1/44
Inventor 肖汉宁
Owner 湖南科一环保科技股份有限公司
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