Preparation method of porous SiOC ceramic with composite pore structure

A technology of porous ceramics and composite pores, applied in the field of porous materials, can solve the problems of single pore-making method and difficulty in preparing porous ceramic materials, etc.

Pending Publication Date: 2021-07-30
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned pore-forming methods are relatively simple, and due to their respective limitations, it is difficult to prepare porous ceramic materials with composite pore structure and ultra-high porosity.

Method used

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  • Preparation method of porous SiOC ceramic with composite pore structure
  • Preparation method of porous SiOC ceramic with composite pore structure
  • Preparation method of porous SiOC ceramic with composite pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the composite hole structure porous Sioc ceramics as follows:

[0033] (1) Oil phase formulation: Prevent the precursor liquid-containing polysiloxane and liquid porous polydimethylsiloxane and mix well for 10 min, then add catalyst dichloride palladium methane complex, stirred for 10 min, Finally, the emulsifier SPAN-80 was added, and the mixture was prepared for 10 min; wherein the mass ratio of the hydrogen-containing polysiloxane, polydimethylsiloxane and palladium palladium chloride complex is 1: 0.005; SPAN-80 quality is 20% of water quality.

[0034] (2) Oil-water mixing: The oil phase of step (1) is added to the oil phase during the stirring, and the mixture is stirred after 30 min after the dropwise addition is completed to obtain a stable and uniform oil-in-water type emulsion; wherein the oil phase and water The mass ratio is 1: 2, and the stirring speed is 500r / min.

[0035] (3) Curing: Pouring the oil-in-water emulsion of step (2) into the mold, placi...

Embodiment 2

[0039] Prepare the composite hole structure porous Sioc ceramics as follows:

[0040] (1) Oil phase formulation: Prevent the precursor liquid polymethylphenylsiloxane and liquid porcelane phenol resin is mixed 60 min, then add catalyst for dibutyltin, stirred for 20 min, and finally add emulsifier. Dimic acid dimethyl, stirred for 20 min to formulate oil phases; wherein the mass ratio of polymethylphenylsiloxane, phenolic resin and dibutyltin is 1: 3: 0.01; malonic acid dimethyl 5% of the water quality.

[0041] (2) Oil-water mixing: The oil phase of step (1) is added to the oil phase during the stirring, and the mixture is stirred after 30 min after the dropwise addition is completed to obtain a stable and uniform oil-in-water type emulsion; wherein the oil phase and water The mass ratio is 1: 1, and the stirring speed is 500r / min.

[0042] (3) Curing formation: Pouring the oil-in-water emulsion of step (2) into the mold, placing the mold in a constant temperature and humidity ...

Embodiment 3

[0045] Prepare the composite hole structure porous Sioc ceramics as follows:

[0046](1) Oil phase formulation: Prevent the precursor liquid-containing polysiloxane, tetramethyl-tetravinyl-ring silica oxide and liquid pore agent epoxy resin is mixed 50 min, then add catalyst platinum two Vinyl tetramethyl-di siloxane complex, stirred for 10 min, finally added modified silicone oil of the emulsifier containing polyoxyethylene group, stirred for 10 min to formulate oil; wherein hydrogen-containing polysiloxane, four Methyl-tetravathor-cyclosiloxane, epoxy resin, platinum diethylene tetramethyl - silicone complex mass ratio is 1: 1: 8: 0.03; containing polyoxyethylene group Modified organic silicone oil quality is 2% of water quality.

[0047] (2) Oil-water mixing: The oil phase of step (1) is added to the oil phase during the stirring, and the mixture is stirred after 30 min after the dropwise addition is completed to obtain a stable and uniform oil-in-water type emulsion; wherein t...

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Abstract

The invention discloses a preparation method of a porous SiOC ceramic with a composite pore structure. The prepared porous SiOC ceramic internally contains a certain amount of nano-scale and micron-scale pores. The method adopts a composite pore-forming method combining an emulsion template method and a liquid pore-forming agent method, and is specifically realized according to the following steps: mixing a precursor liquid, a liquid pore-forming agent, a catalyst and an emulsifier to prepare an oil phase; during stirring, dropwise adding water into the oil phase to form a water-in-oil emulsion; after the water phase is fully emulsified, pouring the emulsion into a mold, and placing the mold at the proper temperature and humidity for curing cross-linking and drying to obtain a green body; and finally, carrying out heat treatment in an inert atmosphere to obtain the porous SiOC ceramic with a composite pore structure. The preparation method has the advantages that: the porous SiOC ceramic with the composite pore structure is prepared in one step by combining an emulsion template method and a liquid pore-forming agent method, and the porosity is adjustable in a large range.

Description

Technical field [0001] The present invention belongs to the technical field of porous material, and more particularly to a method for preparing a porous SiOC ceramic of a composite hole structure. Background technique [0002] Porous ceramics have a series of excellent physical chemical properties such as low density, low thermal conductivity, low heat capacity, low dielectric constant, high anti-heat shock, high transmittance, high ratio surface area, heat insulation, catalyst carrier, All areas of molten metal and high temperature gas filtration have a wide range of application prospects. [0003] The preparation of porous ceramics is mainly from ceramic powder, add binder, aperture agent, a plasticizer, and dispersant, etc., is formed, dried, and sintered. The process is more cumbersome, generally requires a specific degree of coating process, and the sintering temperature is high and the energy consumption is large. The increase in porontal rate is often achieved by increasin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/56C04B35/622C04B35/624
CPCC04B38/0645C04B35/5603C04B35/622C04B35/624C04B2235/6567
Inventor 董宾宾王黎王青峰闵志宇贾铁昆王玉江郑希辰
Owner LUOYANG INST OF SCI & TECH
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