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Multi-channel pure silicon carbide film with asymmetric structure and preparation method for multi-channel pure silicon carbide film

A technology of structural silicon carbide membrane and asymmetric structure, applied in the field of inorganic membrane separation materials and membrane separation materials, can solve the problems of high sintering temperature of pure silicon carbide membrane, low purity of silicon carbide filter material, insufficient mechanical strength, etc. The effect of reducing the number of membrane casings and seals, flexible flow speed and flow time, and increasing filtration throughput and stability

Active Publication Date: 2014-04-16
浙江坚膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another problem to be solved by the present invention is to avoid the problems of low purity, weak corrosion resistance, insufficient mechanical strength and small unit filtration area of ​​the existing silicon carbide filter material, and provide a silicon carbide with a composition of more than 99wt% and a porosity High-strength, high-flux, long-life silicon carbide membranes
[0007] Another problem to be solved by the present invention is to improve the existing problems of high sintering temperature, high equipment requirements, high energy consumption, and high cost of pure silicon carbide films, and provide a sintering temperature of 700-1400°C with easy-to-obtain raw materials. Preparation method of multi-channel asymmetric silicon carbide membrane with simple preparation, easy molding, low production cost, suitable for industrial customization and large-scale production

Method used

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  • Multi-channel pure silicon carbide film with asymmetric structure and preparation method for multi-channel pure silicon carbide film
  • Multi-channel pure silicon carbide film with asymmetric structure and preparation method for multi-channel pure silicon carbide film
  • Multi-channel pure silicon carbide film with asymmetric structure and preparation method for multi-channel pure silicon carbide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Blend 50-100μm silicon carbide particles, polysiloxane, carboxymethyl cellulose, phenolic resin, and polyethyleneimine in toluene at a mass percentage ratio of 65:12:19.5:3:0.5, and the toluene content accounts for the total 30wt% of the weight, after being mechanically stirred, ball milled for 0.5 hours to get a thick slurry, and then put into the mud mill to squeeze and knead for 30min to form a more evenly mixed slurry with good plasticity. Put the above slurry into the extruder. The head of the extruder adopts a 31-hole multi-channel mold with an outer circle and an inner circle. The extrusion pressure is controlled at 5MPa, the extrusion speed is 10mm / s, and the exit of the extruder is dried by infrared. The device quickly dries and finalizes the shape, adopts a high-temperature resistant graphite tray to accept the embryo body, and controls the extrusion length of the embryo body to 500mm; the preliminary formed embryo body is transferred to the drying room for dry...

Embodiment 2

[0043] The difference from Example 1 is:

[0044] Mix 8μm silicon carbide particles with polysiloxane, carboxymethyl cellulose, polyethyleneimine and ethanol according to the mass percentage of 18:5:9:3:65, and stir them evenly to form No. 1 with good fluidity slurry. Put the multi-channel asymmetric structure pure silicon carbide film substrate into the vertical pipe, and the two ends of the substrate are sealed and fixed by the sealing ring, so that only the channels in the substrate are in contact with the slurry in the pipe, and then the slurry is separated by gravity. No. 1 slurry passes through the pipeline at a certain speed, and lasts for a certain period of time, and coats a layer of slurry on both ends of the substrate and internal passages to indicate the attached figure 2 ;The coated substrate is sintered in a sintering furnace after being dried. The heating rate is 6°C / min. First, the temperature is raised to 300°C and kept for 60 minutes; ; Then, the temperatur...

Embodiment 3

[0048] The difference from Example 1 is:

[0049] Mix 0.2μm silicon carbide particles with polysiloxane, carboxymethyl cellulose, phenolic resin, and polyvinylamine according to the mass percentage of 21:4:8:5:62, and stir them evenly to form a good fluidity No. 3 slurry; coated on the multi-channel asymmetric structure pure silicon carbide film of the 2-layer filter layer in Example 1, the coated substrate is sintered in the sintering furnace after being dried, and the heating rate is 4 ° C / min, first raise the temperature to 250°C, and keep it for 30 minutes; then raise the temperature to 800°C at a heating rate of 3°C / min, and keep it for 90 minutes; The furnace was naturally cooled to room temperature, and a multi-channel asymmetric structure pure silicon carbide membrane with three filter layers was obtained.

[0050] Such as figure 1. As shown, the multi-channel asymmetric structure pure silicon carbide membrane is a circular tubular membrane, the channel shape is c...

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Abstract

The invention relates to the technical field of film separation materials and in particular relates to a multi-channel pure silicon carbide film with an asymmetric structure and a preparation method for the multi-channel pure silicon carbide film. The multi-channel pure silicon carbide film with the asymmetric structure consists of pure silicon carbide, is formed by sintering silicon carbide particles with the particle size of 0.1-100 microns and has a three-dimensional communicated gap structure; ducts form the asymmetric structure according to the sizes from small to large in the filtering direction; the aperture ratio of the film is 32-60 percent; the filtering characterization aperture range is ranged from 10-1,000nm; the film material has a tubular multi-channel structure and is formed by performing sintering for 2-4 times; a film base material is combined with a new silicon carbide in a sintering manner, which is formed by performing cracking reaction on a filtering layer serving as a silicon carbide precursor through an adhesive, and the sintering temperature is 700-1,400 DEG C. The obtained silicon carbide film has the characteristics of high filtering precision, high purity, high porosity, high intensity, large flux and long service life; the preparation method has the advantages of flexibility in control, low energy consumption, readily availability of raw materials, easiness in forming and suitability for industrial customization and can meet large-scale production.

Description

Technical field [0001] The patent of the present invention relates to the technical field of membrane separation materials, in particular to the technical field of inorganic membrane separation materials, specifically a multi-channel asymmetric structure pure silicon carbide membrane and its preparation method. Background technique [0002] Membrane separation technology is an emerging multidisciplinary high-tech. Membrane materials involve polymer chemistry and inorganic chemistry, membrane preparation, separation characteristics, and transfer processes involve fluid mechanics, thermodynamics, chemical kinetics, process design, etc. aspect disciplines. The application of membrane separation technology involves various industries, with a wide range of applications and a high degree of industrial relevance. Compared with other separation technologies, it has the advantages of high efficiency, energy saving, easy process control, convenient operation, environmental friendline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/04C04B38/06C04B35/565C04B35/622
Inventor 张云飞
Owner 浙江坚膜科技有限公司
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