CN110937924A - High-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating and preparation method thereof - Google Patents
High-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating and preparation method thereof Download PDFInfo
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- CN110937924A CN110937924A CN201911189538.0A CN201911189538A CN110937924A CN 110937924 A CN110937924 A CN 110937924A CN 201911189538 A CN201911189538 A CN 201911189538A CN 110937924 A CN110937924 A CN 110937924A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24491—Porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24492—Pore diameter
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Filtering Materials (AREA)
Abstract
The invention discloses a high-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating which comprises, by weight, 35-45 parts of clinker particles, 8-12 parts of silica sol with the solid content of 40%, 0.1-0.3 part of xanthan gum and 10-20 parts of water. The clinker particles are a mixture of talcum powder, alumina, kaolin and water. The invention also discloses a preparation method of the inner wall coating of the honeycomb ceramic pore canal with high trapping rate and low back pressure. By adopting the design of the invention, a new pore channel is constructed again on the premise of forming pores by the original honeycomb ceramic, and a coating with higher porosity and finer pores is adopted for filtering on the premise of not influencing the formed porosity, thereby improving the filtering efficiency of the honeycomb ceramic.
Description
Technical Field
The invention relates to a honeycomb ceramic pore inner wall coating, in particular to a high-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating and a preparation method thereof.
Background
In 7/1.2019, more than 14 provinces and cities in China implement the national six-emission regulations of gasoline vehicles in advance, the national six-regulation of gasoline vehicles is divided into two versions, namely national six a and national six b, most of the current automobile factories in China select to directly develop an after-treatment system meeting the national six b standard in the vehicle emission upgrading development process, and the mainstream national six b technical route adopts GPF (gasoline engine particle filter) to meet the technical requirements.
The requirements of wall-flow honeycomb ceramics as an exhaust gas treatment device are that the product porosity is more than 55%, the average micropore aperture is more than 20 μm, some fine exhaust particles easily enter a pore channel in the use process to increase backpressure, the prior art generally increases the porosity or increases the pore diameter to meet the requirement of backpressure, but the requirement of increasing the porosity on the technology is quite strict, the product porosity prepared by the prior art is generally in the interval of 50-60%, and the required finished product is multiplied and is obviously not suitable for industrial quantitative production, and if the pore diameter is increased, the trapping efficiency is reduced to a certain extent.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the problems that the existing wall-flow honeycomb ceramic is easy to be blocked by fine dust to cause the increase of back pressure, the increase of porosity cannot be achieved, the increase of pore diameter reduces the collection efficiency, and the two cannot be obtained at the same time.
The technical scheme is as follows: the invention provides the following technical scheme:
the high-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating comprises, by weight, 35-45 parts of clinker particles, 8-12 parts of silica sol with the solid content of 40%, 0.1-0.3 part of xanthan gum and 10-20 parts of water.
Further, the clinker particles comprise 35-45 parts by weight of talcum powder, 20-30 parts by weight of alumina, 30-40 parts by weight of kaolin and 35-45 parts by weight of water.
Furthermore, the particle size of the talcum powder is 18-22 microns, and the aluminum oxide is powdery aluminum oxide and is 5-7 microns.
A preparation method of a honeycomb ceramic pore inner wall coating with high trapping rate and low back pressure comprises the following steps:
1) mixing talcum powder, alumina, kaolin and water;
2) ball-milling the mixture obtained in the step 1) for 1-2 hours, and then performing filter pressing to obtain a cake;
3) sintering the cake obtained in the step 2) at 1400-1430 ℃;
4) crushing the product obtained in the step 3) in a crusher to obtain a crushed mixture;
5) taking the crushed mixture as clinker particles, and mixing the clinker particles, silica sol, xanthan gum and water to obtain coating slurry;
6) selecting honeycomb ceramics with porosity of more than 60%, inserting an air inlet end of the honeycomb ceramics into the coating slurry, and connecting a vacuum pump at an air outlet end to adsorb the coating slurry;
7) and opening a vacuum pump, performing vacuum adsorption for 0.5-6 s to obtain a product with a coating on the inner wall of the honeycomb ceramic, and drying for 2 hours at 120 ℃ to obtain a finished product.
Further, in the step 5), the crushed mixture with the average particle size of 15-20 microns obtained in the step 4) is selected as clinker particles.
In the background art, as qualified honeycomb ceramics, the average pore diameter needs to be larger than 20 μm, so relatively speaking, if the pore diameter of the prepared coating is smaller than the interval, namely smaller than 20 μm, the average particle diameter selected by the coating is 15-20 μm, the pore diameter of the obtained coating is finally 10-15 μm, the thickness is 10-20 μm, the coating can filter the dust which can not be filtered by the honeycomb ceramics or can easily block the honeycomb ceramics, and because the coating is of the coating property, the porosity can reach more than 70%, so the filtering efficiency of the honeycomb ceramics can not be influenced.
Has the advantages that: compared with the prior art, the invention has the advantages that:
by adopting the design of the invention, a new pore channel is constructed again on the premise of forming pores by the original honeycomb ceramic, and a coating with higher porosity and finer pores is adopted for filtering on the premise of not influencing the formed porosity, thereby improving the filtering efficiency of the honeycomb ceramic.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art after reading the present invention and fall within the scope of the appended claims.
Example 1
The inner wall coating with the high capture rate and the low back pressure of the honeycomb ceramic pore channel comprises, by weight, 35 parts of clinker particles, 8 parts of silica sol with the solid content of 40%, 0.1 part of xanthan gum and 10 parts of water.
The clinker particles comprise 35 parts by weight of talcum powder, 20 parts by weight of alumina, 30 parts by weight of kaolin and 35 parts by weight of water.
The particle size of the talcum powder is 18 mu m, and the alumina is powdery alumina with the particle size of 5 mu m.
The porosity of the coating finally obtained by adopting the formula is 73%, the average micropore diameter is 11 microns, the thickness of the coating on the inner wall of the honeycomb ceramic is 12 microns, the porosity of the honeycomb ceramic is 62%, the filtering efficiency is 60%, after the coating is added, the filtering efficiency is 62%, and for the particle size of micro-dust being 11-20 microns, the honeycomb ceramic cannot be blocked.
Example 2
The high-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating comprises, by weight, 35-45 parts of clinker particles, 8-12 parts of silica sol with the solid content of 40%, 0.1-0.3 part of xanthan gum and 10-20 parts of water.
The clinker particles comprise 45 parts of talcum powder, 30 parts of alumina, 40 parts of kaolin and 45 parts of water by weight.
The particle size of the talcum powder is 22 mu m, and the alumina is powdery alumina with the particle size of 7 mu m.
The porosity of the coating finally obtained by adopting the formula is 72%, the average micropore diameter is 12 microns, the thickness of the coating on the inner wall of the honeycomb ceramic is 13 microns, the porosity of the honeycomb ceramic is 60%, the filtering efficiency is 56%, after the coating is added, the filtering efficiency is 59%, and the particle size of micro-dust is 12-20 microns, so that the honeycomb ceramic cannot be blocked.
Example 3
The inner wall coating with the high capture rate and the low back pressure of the honeycomb ceramic pore channel comprises, by weight, 40 parts of clinker particles, 10 parts of silica sol with the solid content of 40%, 0.2 part of xanthan gum and 15 parts of water.
The clinker particles comprise 40 parts of talcum powder, 25 parts of alumina, 35 parts of kaolin and 40 parts of water by weight.
The particle size of the talcum powder is 20 microns, and the alumina is powdery alumina with the particle size of 6 microns.
The porosity of the coating finally obtained by adopting the formula is 76%, the average micropore diameter is 13 microns, the thickness of the coating on the inner wall of the honeycomb ceramic is 15 microns, the porosity of the honeycomb ceramic is 60%, the filtering efficiency is 56%, after the coating is added, the filtering efficiency is 63%, and the particle size of micro-dust is 13-20 microns, so that the honeycomb ceramic cannot be blocked.
Example 4
A preparation method of a honeycomb ceramic pore inner wall coating with high trapping rate and low back pressure comprises the following steps:
1) mixing talcum powder, alumina, kaolin and water;
2) ball-milling the mixture obtained in the step 1) for 1-2 hours, and then performing filter pressing to obtain a cake;
3) sintering the cake obtained in the step 2) at 1400-1430 ℃;
4) crushing the product obtained in the step 3) in a crusher to obtain a crushed mixture;
5) selecting the crushed mixture with the average particle size of 15-20 microns obtained in the step 4) as clinker particles, and mixing the clinker particles, silica sol, xanthan gum and water to obtain coating slurry;
6) selecting honeycomb ceramics with porosity of more than 60%, inserting an air inlet end of the honeycomb ceramics into the coating slurry, and connecting a vacuum pump at an air outlet end to adsorb the coating slurry;
7) and opening a vacuum pump, performing vacuum adsorption for 0.5-6 s to obtain a product with a coating on the inner wall of the honeycomb ceramic, and drying for 2 hours at 120 ℃ to obtain a finished product.
In the background art, as qualified honeycomb ceramics, the average pore diameter needs to be larger than 20 μm, so relatively speaking, if the pore diameter of the prepared coating is smaller than the interval, namely smaller than 20 μm, the average particle diameter selected by the coating is 15-20 μm, the pore diameter of the obtained coating is finally 10-15 μm, the thickness is 10-20 μm, the coating can filter the dust which can not be filtered by the honeycomb ceramics or can easily block the honeycomb ceramics, and because the coating is of the coating property, the porosity can reach more than 70%, so the filtering efficiency of the honeycomb ceramics can not be influenced.
Claims (5)
1. A high-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating is characterized in that: the high-temperature resistant and environment-friendly heat-resistant mortar comprises, by weight, 35-45 parts of clinker particles, 8-12 parts of silica sol with a solid content of 40%, 0.1-0.3 part of xanthan gum and 10-20 parts of water.
2. The high capture rate low back pressure honeycomb ceramic cell inner wall coating of claim 1, wherein: the clinker particles comprise 35-45 parts of talcum powder, 20-30 parts of alumina, 30-40 parts of kaolin and 35-45 parts of water by weight.
3. The high capture rate low back pressure honeycomb ceramic cell inner wall coating of claim 2, wherein: the particle size of the talcum powder is 18-22 mu m, and the aluminum oxide is powdery aluminum oxide and is 5-7 mu m.
4. The method for preparing the coating on the inner wall of the honeycomb ceramic cell channel with high trapping rate and low back pressure according to claim 1, wherein the coating is prepared by the following steps: the method comprises the following steps:
1) mixing talcum powder, alumina, kaolin and water;
2) ball-milling the mixture obtained in the step 1) for 1-2 hours, and then performing filter pressing to obtain a cake;
3) sintering the cake obtained in the step 2) at 1400-1430 ℃;
4) crushing the product obtained in the step 3) in a crusher to obtain a crushed mixture;
5) taking the crushed mixture as clinker particles, and mixing the clinker particles, silica sol, xanthan gum and water to obtain coating slurry;
6) selecting honeycomb ceramics with porosity of more than 60%, inserting an air inlet end of the honeycomb ceramics into the coating slurry, and connecting a vacuum pump at an air outlet end to adsorb the coating slurry;
7) and opening a vacuum pump, performing vacuum adsorption for 0.5-6 s to obtain a product with a coating on the inner wall of the honeycomb ceramic, and drying for 2 hours at 120 ℃ to obtain a finished product.
5. The method for preparing the coating on the inner wall of the honeycomb ceramic cell channel with high trapping rate and low back pressure according to claim 4, wherein the coating is prepared by the following steps: in the step 5), the crushed mixture with the average particle size of 15-20 microns obtained in the step 4) is selected as clinker particles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911189538.0A CN110937924A (en) | 2019-11-28 | 2019-11-28 | High-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating and preparation method thereof |
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| CN201911189538.0A CN110937924A (en) | 2019-11-28 | 2019-11-28 | High-trapping-rate low-backpressure honeycomb ceramic pore inner wall coating and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1552670A (en) * | 2003-12-12 | 2004-12-08 | 中国科学院上海硅酸盐研究所 | Mesh porous ceramic preparing method |
| KR20080058970A (en) * | 2006-12-23 | 2008-06-26 | 주식회사 엘지화학 | Sintering-binding adhesive tape containing inorganic compounds and organic compounds, and method for preparation of honeycomb ceramic filter using the same |
| CN101443093A (en) * | 2006-03-31 | 2009-05-27 | Lg化学株式会社 | Ceramic filter comprising clay and process for preparing thereof |
| CN102671716A (en) * | 2012-05-23 | 2012-09-19 | 江苏高淳陶瓷股份有限公司 | High temperature-resisting active coating and preparation method thereof |
-
2019
- 2019-11-28 CN CN201911189538.0A patent/CN110937924A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1552670A (en) * | 2003-12-12 | 2004-12-08 | 中国科学院上海硅酸盐研究所 | Mesh porous ceramic preparing method |
| CN101443093A (en) * | 2006-03-31 | 2009-05-27 | Lg化学株式会社 | Ceramic filter comprising clay and process for preparing thereof |
| KR20080058970A (en) * | 2006-12-23 | 2008-06-26 | 주식회사 엘지화학 | Sintering-binding adhesive tape containing inorganic compounds and organic compounds, and method for preparation of honeycomb ceramic filter using the same |
| CN102671716A (en) * | 2012-05-23 | 2012-09-19 | 江苏高淳陶瓷股份有限公司 | High temperature-resisting active coating and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李小龙: "高温含尘废气净化用堇青石质壁流式蜂窝陶瓷", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 麦荣坚等: "堇青石蜂窝陶瓷上真空抽提法涂覆氧化铝涂层的研究", 《材料导报》 * |
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Application publication date: 20200331 |