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A kind of preparation method of composite coating material

A composite coating and alumina coating technology, which is applied in separation methods, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of decreased firmness, difficulty in dispersing pore-forming agents uniformly, and multiple cracks on the coating surface , to achieve the effect of improving the properties, benefiting the properties of the carrier, and simplifying the steps

Active Publication Date: 2022-07-08
山东中材汽车复合材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing monolithic cordierite catalyst pore-making technology generally adds a physical or chemical pore-enlarging agent to the coating sol or slurry, and the pore-forming process generally starts from mixing the pore-forming agent and coating sol to During the period before firing, it is difficult for the pore-forming agent to maintain uniform dispersion in the sol. At the same time, the energy generated by pore-forming during the firing process also has a certain impact on the strength of the coating. Cause more cracks on the surface of the coating and decrease the firmness

Method used

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  • A kind of preparation method of composite coating material
  • A kind of preparation method of composite coating material
  • A kind of preparation method of composite coating material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The preparation method of the honeycomb cordierite matrix loaded with alumina coating: immerse the cut honeycomb cordierite matrix into aluminum sol (solid content of 10wt%~30wt%) for 5~30 minutes, blow it off with compressed air For the residual liquid, according to the solid content of the aluminum sol and the required coating amount, the above-mentioned dipping process is repeated 1 to 3 times, and the honeycomb-shaped cordierite matrix with different loading amounts of alumina coatings is obtained after drying and calcination. The drying temperature is 100-160℃, and the drying time is 4-20 hours. The roasting temperature is 400-750 DEG C, and the roasting time is 4-10 hours. Both drying and firing atmospheres were air.

Embodiment 2

[0021] (1) Mix the titanium metal powder and hydrogen peroxide according to the ratio (1g: 20mL), react at 25°C for 6 hours, filter out the unreacted titanium powder to obtain a yellow filtrate, adjust the pH value with ammonia water to 4.5, and set aside.

[0022] (2) Immerse the alumina-coated honeycomb cordierite substrate (loading amount of 12wt%) into the filtrate obtained in step (1), immerse it at room temperature (25°C) for 8 hours, and dry to obtain a large number of micron-sized pores. The composite coating material of the coating, the titanium content accounts for 5wt% of the total weight of the coating, wherein the titanium is calculated as titanium dioxide.

Embodiment 3

[0024] (1) Mix the titanium metal powder and hydrogen peroxide according to the ratio (1g:50mL), react at 25°C for 5 hours, filter out the unreacted titanium powder to obtain a yellow filtrate, adjust the pH value with ammonia water to 4, and set aside.

[0025] (2) Immerse the alumina-coated honeycomb cordierite substrate (with a loading of 15wt%) into the filtrate obtained in step (1), immerse it at room temperature (25°C) for 8 hours, and dry to obtain a large number of micron-sized pores. The composite coating material of the coating, the titanium content accounts for 4.2wt% of the total weight of the coating, wherein the titanium is calculated as titanium dioxide.

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Abstract

The invention discloses a preparation method of a composite coating material, which includes the following contents: (1) Preparation of a titanium-containing impregnation solution: adding metal titanium powder into hydrogen peroxide to react for a period of time, and then filtering to obtain a yellow and clear titanium-containing impregnation solution (2) placing the alumina-coated honeycomb cordierite substrate in the titanium-containing dipping solution obtained in step (1), dipping for a period of time, taking out, blowing off the residual liquid, and drying to obtain titanium-containing monolithic cordierite vector. The carrier coating has a multi-level pore structure, especially rich micron-scale macropores, and the pores are treated with titanium modification at the same time, which is beneficial to improve the surface properties of the alumina coating, and is an excellent composite coating material.

Description

technical field [0001] The invention relates to a preparation method of a composite coating material. Background technique [0002] The monolithic cordierite material not only has the advantages of low pressure, high mass transfer efficiency and good heat resistance, but also can quickly separate the target product from the reaction system, reducing the further oxidation of the target product, thereby increasing the yield of the target product and becoming a A new type of catalyst is widely used in the fields of chemical production and environmental protection. The surface of the monolithic cordierite catalyst is generally coated with alumina or silica coating to increase the specific surface area of ​​the catalyst. The coating is generally limited to its own pores, which seriously affects the mass transfer of the reaction raw materials, and is easily blocked by reaction impurities, which further affects the operating cycle of the catalyst. [0003] Catalysts prepared from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J32/00B01J35/10B01J37/02B01D53/86B01D53/56B01D49/00
CPCB01J21/063B01J23/002B01J37/0244B01D53/8628B01D49/00B01D2258/012B01J35/657Y02A50/20
Inventor 王婧李安邦蔡连营路长会翟国芳
Owner 山东中材汽车复合材料有限公司