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Porous ceramic material and preparation method thereof

A technology of porous ceramics and ceramic materials, applied in the field of ceramic materials, can solve the problems of many cracks, uneven pore size distribution, poor bonding force, etc., and achieve the effects of uniform and controllable production process, avoiding material defects, and improving strength

Inactive Publication Date: 2020-08-25
JIANGSU PROVINCE YIXING NONMETALLIC CHEM MACHINERY FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most flat film manufacturers use a large amount of organic pore-forming agents to increase the porosity in the production of flat film supports. Most of the pore-forming agents are starch, graphite, resin powder, polymer plastic balls, charcoal powder, paraffin, etc.; The amount is as high as 10% or more, but high-temperature decoking of organic matter will cause more cracks in the product and a low pass rate. On the other hand, due to the use of organic pore-forming agents, in order to increase the pores, the amount of pore-forming agents must be increased, which will Cause product strength to drop; At the same time, a large amount of harmful gas will be emitted, seriously polluting the environment
Moreover, the organic pore-forming agent of the porous ceramic material in the prior art and the inorganic main material such as α-alumina, mullite, silicon carbide, etc. have poor compatibility and poor binding force, and are prone to agglomeration, and the product appears Large pores, uneven pore size distribution and other defects

Method used

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  • Porous ceramic material and preparation method thereof
  • Porous ceramic material and preparation method thereof
  • Porous ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Table 1

[0031] raw material name Fineness μm Viscosity mpa.s parts by weight α-alumina 5 / 60 Suzhou kaolin 3 / 5 Tetrahydroxy aluminum oxalate particles 0.04-0.1 / 15 Zinc borate 1 / 1 Hydroxypropylmethylcellulose / 6000 3 Oleic acid / / 0.5 canola oil / / 1 Deionized water / / 15

[0032] Put tetrahydroxy aluminum oxalate particles and Suzhou kaolin into the mixer in turn and stir and mix, then add α-alumina and stir and mix again, then add zinc borate powder and stir and mix, and finally add hydroxypropyl methylcellulose, Obtain the premix; simultaneously oleic acid, rapeseed oil and water were pre-stirred and mixed for 5 minutes to obtain a mixed solution, and the gained premix was added to a kneader, and the mixed solution was added while kneading and kneaded for 20 minutes to obtain a kneaded sludge. Knead the mud for two times in vacuum, stale for 24 hours, extrude, microwave dry...

Embodiment 2

[0035] Table 2

[0036]

[0037]

[0038] Put tetrahydroxy aluminum oxalate particles and calcium-based bentonite powder into the mixer in turn and stir and mix, then add α-alumina and stir and mix again, then add sodium borate and stir and mix, finally add hydroxypropyl methylcellulose , to obtain a premix; at the same time, oleic acid, rapeseed oil and deionized water were mixed in advance for 8 minutes to obtain a mixed solution, and the resulting premix was added to a kneader, and the mixed solution was added while kneading and kneaded for 20 minutes to obtain a kneaded mud The kneaded mud material is vacuum smelted twice, aged for 30 hours, extruded, dried in microwave, fired in a tunnel kiln, from room temperature to 400 °C at a rate of 60 °C / h; then raised to 120 °C / h 1300°C, keep warm for 4 hours.

[0039] The product prepared according to the above process has a porosity of 42%, an average pore diameter of 2.1 microns, a maximum pore size of 2.89 microns, a fle...

Embodiment 3

[0041] table 3

[0042] raw material name Fineness μm Viscosity mpa.s parts by weight Mullite powder 8 / 65 andalusite 5 / 10 Tetrahydroxy aluminum oxalate particles 0.1-1 / 12 boric acid 1 / 1.5 Starch ether / 4000 5 sodium stearate / / 1 Olefin oil / / 1 Deionized water / / 16

[0043]Put tetrahydroxy aluminum oxalate particles and andalusite into the mixer in turn and stir and mix, then add mullite powder and stir and mix again, then add boric acid and stir and mix, finally add starch ether to obtain a premix; Oil, sodium stearate and deionized water were stirred and mixed in advance for 10 minutes to obtain a mixed solution, and the obtained premix was added to a kneader, and the mixed solution was added while kneading and kneaded for 20 minutes to obtain a kneaded mud, and the kneaded mud was vacuum kneaded Clay twice, aged for 40 hours, extruded, microwave dried, fired in a tunnel kiln, fr...

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Abstract

The invention provides a porous ceramic material and a preparation method thereof, and belongs to the field of ceramic materials. The ceramic material is prepared from the following raw materials in parts by weight: 60 to 75 parts of aggregate; 5 to 10 parts of kaolin; 8 to 15 parts of tetrahydroxy aluminum oxalate; 1 to 3 parts of a fluxing agent; 3 to 7 parts of an adhesive; 0.5 to 2 parts of adispersing agent; 1 to 3 parts of a lubricating agent; and 15 to 18 parts of water. The tetrahydroxy aluminum oxalate releases gas in the firing process of ceramic mud, so that pore forming of the ceramic material is completed; superfine aluminum oxide obtained by decomposition is used as a ceramic component to be combined into a ceramic phase in situ; due to the addition of the fluxing agent, a temperature window generated by the decomposing and gas release of the tetrahydroxy aluminum oxalate in the firing process of the ceramic mud is matched with a temperature window generated by the low-melting ceramic phase, so that the problem that the ceramic does not generate a molten phase when a common pore-forming agent decomposes and releases gas is avoided, and the problem that the common pore-forming agent decomposes and discharges polluting gas is solved. The porous ceramic obtained by the method is uniform and through in pore channels, controllable in porosity and good in stability.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a porous ceramic material and a preparation method thereof. Background technique [0002] Porous ceramic materials are mostly used in the field of filtration. Porous ceramic materials are usually made of α-alumina, mullite, silicon carbide, etc., after molding and sintering. Performance, usually a large amount of organic pore-forming agent is added to increase the flux, which will cause defects such as relatively wide pore size and distribution, low strength, easy cracking of the product, and low pass rate. With the rapid development of the economy, industrial production has also developed. Among porous ceramic materials, flat ceramic membranes, as an important material for water filtration, play an important role in industrial production and environmental protection. The problems faced are environmental protection such as waste water, waste gas, solid waste and thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/565C04B35/185C04B35/443C04B38/02
CPCC04B35/10C04B35/185C04B35/443C04B35/565C04B38/02C04B2235/3409C04B2235/349C04B2235/449C04B2235/6562C04B2235/6567C04B2235/96C04B38/0074C04B38/0054
Inventor 陈明祥冯家迪
Owner JIANGSU PROVINCE YIXING NONMETALLIC CHEM MACHINERY FACTORY
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