CN104667758A - Negative-pressure coating method - Google Patents
Negative-pressure coating method Download PDFInfo
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- CN104667758A CN104667758A CN201510086950.5A CN201510086950A CN104667758A CN 104667758 A CN104667758 A CN 104667758A CN 201510086950 A CN201510086950 A CN 201510086950A CN 104667758 A CN104667758 A CN 104667758A
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- rete
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Abstract
The invention relates to a negative-pressure coating method comprising the steps of a. providing a tool with a coating supporting body, enabling the coated surface of the coating supporting body to face to an open space, and locating the non-coated surface of the coating supporting body in a negative-pressure space communicated with negative-pressure equipment such as a vacuum pump; b. at least arranging the whole coated surface of the coating supporting body in the tool into slurry, and isolating the non-coated surface of the coating supporting body from the slurry; c. enabling the air pressure inside the negative-pressure space to be lower than the pressure in the slurry through the negative-pressure equipment, and attaching powder particles in the slurry onto the coated surface of the coating supporting body under the action of a pressure difference to form a coating; and d. sintering the dry formed coating supporting body with the coating to form a porous film. The negative-pressure coating method disclosed by the invention is very simple and feasible, the efficiency of uniformly and rapidly coating the coating supporting body is greatly increased, meanwhile, the forming quality of the coating is also remarkably improved, and the stability of the filtering effect of the porous metal film is greatly improved.
Description
Technical field
The present invention relates to film plating process, is a kind of method of negative pressure plated film concretely.
Background technology
All need to be filtered gas by filter membrane in the many industry comprising high temperature filtration, a kind of common structure of filter membrane is metal film, its base material is metal, film material is metal or metal oxide, and for separating of the perforated membrane of impurity in gas and gas, wherein film material is made up of powder particle.Its separation process utilizes the space between the powder particle of film material to be separated with impurity gas, and the void size between powder particle is generally hundreds of nanometers.
Symmetrical porous metal film and asymmetric porous metal film is divided into again according to the section structure of porous metal film.Unsymmetrical metal film along with the increase of thicknesses of layers, rete aperture or increase or reduction.Asymmetric porous metals membrane structure is divided into two parts: rete supporter and rete.Rete supporter is porous metals, and rete is generally the materials such as metal, alloy or metal oxide.
The main feature of asymmetric porous metal film is that the rete riding in metal on the thicker porous metals rete supporter in space or metal oxide by one deck is formed.The thick porous membrane layer in aperture supports while physical efficiency ensures filter core mechanical strength, and when also ensureing to filter, the pressure loss is very little, and separation function is then born by the metallic diaphragm be sintered together with porous membrane layer supporter, and separation accuracy can arrive submicron order., compare with symmetrical structure metal polyporous material, the transit dose with the metal membrane material of dissymmetrical structure can improve exponentially meanwhile.
The preparation method of asymmetric porous metal film mainly contains slipeasting etc.The principle of suspended particles sintering is mixed with suitable dispersant media by powder particle to disperse to form stable suspension, then by suspension on rete supporter casing play, sinter at a certain temperature after drying, the part that in sintering process, powder contacts with each other is sintered together, and the space between powder forms micropore.The preparation process of floating particles sintering method mainly comprises: 1, prepare rete powder slurry; 2, rete is shaped, and is attached to rete supporting body surface and drying by rete powder slurry by corresponding mode (as brushing); 3, sinter, in sintering process, particle contacts with each other and is partly sintered together, and the space between powder forms micropore.The principle roughly of sintering the rete supporter being coated with rete is put into the reaction temperature (below fusing point) that stove is heated to rete, and the powder particle of rete reacts and is combined with rete supporter and forms one.In sintering process just between each powder particle, and carry out reaction bonded between powder particle and rete supporter, powder particle and rete supporter can't melt, and the aperture between each powder particle still exists.Gap between rete is called rete aperture, and clearly, rete aperture is much less than the aperture of rete supporter, thus reaches the object in refinement aperture.
The forming mode of above-mentioned preparation process, has the modes such as artificial brushing and mechanically spraying at present.The inefficiency of artificial brushing, thicknesses of layers is uneven, and main cause comprises: 1, the film liquid measure of spray gun ejection is uneven; 2, spray gun translational speed is uneven, and nozzle is longer a position time of staying, and the quantity for spray of this position is larger, and coating thickness is larger, and spray gun translational speed, by Non-follow control, cannot ensure that the quantity for spray of each position is consistent; 3, repeat spraying number of times to be difficult to control.During hand spray, generally need to repeat spraying for several times to painted object, in this process, cannot ensure that each position spraying number of times is the same, such as, time to some position sprayings, the position that around it, other has sprayed may also will be sprayed onto.Although and the efficiency utilizing machine tool to spray is higher, but still can exist ejection film liquid two uneven, repeat the problems such as spraying, thicknesses of layers is still wayward.And thicknesses of layers all has a direct impact the filtering accuracy of rete and filter efficiency.
Summary of the invention
The invention provides a kind of method of negative pressure plated film, by the method for simple possible, plated film is fast carried out evenly to rete supporter, to improve the forming quality of rete, filter effect is stablized.
The method of negative pressure plated film of the present invention, comprising:
A. have the frock comprising rete supporter, the coated surface of rete supporter is towards open space, and the non-coated surface of rete supporter is arranged in the negative pressure space be communicated with negative pressure equipments such as vavuum pumps;
B. at least make the coated surface of rete supporter in frock all be placed in powder slurry, and the non-coated surface of rete supporter and powder are starched and are isolated;
C. by negative pressure equipment make the air pressure in negative pressure space be less than described powder slurry in pressure, powder slurry in powder particle be attached under the effect of pressure differential rete supporter coated surface formed rete;
D. will there is described rete and the formed film supporter of drying is sintered to perforated membrane.
Because rete supporter is porous metal material, be therefore that the tiny holes being μm level by a large amount of aperture is communicated with between non-coated surface and coated surface.After the negative pressure equipment unlatching of the forms such as vavuum pump, the pressure of the non-coated surface of rete supporter reduces, and causes the non-coated surface of the aperture on rete supporter pressure drop low, and the powder particle in powder slurry shifts to the aperture of coated surface under the effect of pressure difference, and pile up in aperture, form rete.Clearly this plated film mode does not need artificial or machinery to spray, be attached on rete supporter by natural pressure official post powder particle, therefore on the whole coated surface of rete supporter, the distribution of powder particle is uniform, and thicknesses of layers accurately can be controlled by pressure difference and negative pressure time.Asymmetric porous metal film is formed again by conventional sintering process.Method of the present invention is not only simple, and significantly improves plated film efficiency and coating quality.
In order to the uniformity of the permeability and aperture that ensure rete, the surface of the powder particle in described powder slurry can be set to level and smooth cambered surface, wherein spherical powder particle is the most preferred.
Further, in powder slurry, powder particle is the powder particle that particle diameter is about the half in the aperture of film support, the powder particle of this scale easier in the hole of rete supporter accumulated plugging, thus form rete, the aperture of rete is the gap between each powder particle.If the powder particle of rete is excessive, then powder particle is not easily formed and piles up in the hole of rete supporter, thus is not easy to form rete; If powder particle is too small, then directly through the aperture of rete supporter, also can not form rete.Therefore by a large amount of experiment test, the half that the particle diameter of powder particle is about the aperture of film support is comparatively suitable.
Further, vacuumize in step c to negative pressure space, the pressure difference of coated surface and non-coated surface can be made like this to reach maximum, powder particle can be attached on the coated surface of rete supporter faster.
On the basis of the above, can also include and can make the homodisperse dispersant of powder particle in powder slurry.Dispersant also often has use in existing coating process, and the powder particle during dispersant can make powder starch is uniformly dispersed, and the phenomenons such as local reunion, sedimentation, uneven concentration do not occur within a certain period of time.For the powder particle of unlike material, applicable dispersant and the concentration of dispersant need be selected, to ensure the stability that powder is starched.
The method of negative pressure plated film of the present invention, very simple possible, and greatly improve the efficiency of rete supporter being carried out to evenly plated film fast, also obviously improve the forming quality of rete simultaneously, the stability of porous metal film filter effect is greatly improved.
Below in conjunction with the detailed description of the invention of embodiment, foregoing of the present invention is described in further detail again.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following example.Without departing from the idea case in the present invention described above, the various replacement made according to ordinary skill knowledge and customary means or change, all should comprise within the scope of the invention.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram during the method for negative pressure plated film of the present invention uses.
Fig. 2 is the schematic diagram during the method another kind of negative pressure plated film of the present invention uses.
Detailed description of the invention
Embodiment 1:
The method of negative pressure plated film of the present invention as shown in Figure 1, there is the frock 2 comprising perforated plate-like rete supporter 1, the coated surface of rete supporter 1 is towards open space, and the non-coated surface of rete supporter 1 is arranged in negative pressure space, and negative pressure space is communicated with by negative pressure equipments such as pipeline 4 and vavuum pumps.Configure powder slurry 3 in the usual way according to the filtering requirement of rete, the powder particle in powder slurry 3 is spherical, better can ensure the permeability of rete and the uniformity in aperture.Meanwhile, in powder slurry 3, the particle diameter of powder particle is about the aperture half on film support 1, the powder particle of this scale easier in the hole of rete supporter 1 accumulated plugging, thus form rete.Also include in powder slurry 3 and can make the homodisperse dispersant of powder particle, be uniformly dispersed with the powder particle making powder starch in 3, the phenomenons such as local reunion, sedimentation, uneven concentration do not occur within a certain period of time.For the powder particle of unlike material, need in a conventional manner to select applicable dispersant and the concentration of dispersant, to ensure the stability that powder is starched.
Then frock 2 and rete supporter 1 are all placed in powder slurry 3, and the non-coated surface of rete supporter 1 is starched 3 with powder and is isolated in negative pressure space.Make the air pressure in negative pressure space be less than pressure in powder slurry 3 by pipeline 4 after opening the negative pressure equipment such as vavuum pump, the coated surface that the powder particle in powder slurry 3 is attached to rete supporter 1 uniformly under the effect of pressure differential forms rete.Finally will there is described rete and the formed film supporter 1 of drying becomes asymmetric perforated membrane after sintering according to a conventional method.
Embodiment 2:
On the basis of embodiment 1, overlay film is carried out to the rete supporter 1 of perforated tubular.Entangle the two ends of tubular film supporter 1 by the frock 2 of rubber seal nested structure, make it seal.The sealing shroud of then one end wherein offers through hole connecting pipe 4 to negative pressure equipment, using the inner chamber of tubular film supporter 1 as negative pressure space.Frock 2 and rete supporter 1 entirety are placed in powder slurry 3, open after negative pressure equipment and make the air pressure in tubular film supporter 1 inner chamber to be less than the pressure in powder slurry 3 by pipeline 4, the outside coated surface that the powder particle in powder slurry 3 is attached to rete supporter 1 uniformly under the effect of pressure differential forms rete.Finally will there is described rete and the formed film supporter 1 of drying becomes asymmetric perforated membrane after sintering according to a conventional method.
Claims (6)
1. the method for negative pressure plated film, its feature comprises:
A. have the frock comprising rete supporter, the coated surface of rete supporter is towards open space, and the non-coated surface of rete supporter is arranged in the negative pressure space be communicated with negative pressure equipment;
B. at least make the coated surface of rete supporter in frock all be placed in powder slurry, and the non-coated surface of rete supporter and powder are starched and are isolated;
C. by negative pressure equipment make the air pressure in negative pressure space be less than described powder slurry in pressure, powder slurry in powder particle be attached under the effect of pressure differential rete supporter coated surface formed rete;
D. will there is described rete and the formed film supporter of drying is sintered to perforated membrane.
2. the method for negative pressure plated film as claimed in claim 1, is characterized by: the surface of the powder particle in described powder slurry is level and smooth cambered surface.
3. the method for negative pressure plated film as claimed in claim 2, is characterized by: the powder particle in described powder slurry is spherical.
4. the method for negative pressure plated film as claimed in claim 1, is characterized by: in powder slurry, powder particle is the powder particle that particle diameter is about the half in the aperture of film support.
5. the method for negative pressure plated film as claimed in claim 1, is characterized by: vacuumize negative pressure space in step c.
6. the method for the negative pressure plated film as described in one of claim 1 to 5, is characterized by: include in powder slurry and can make the homodisperse dispersant of powder particle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510086950.5A CN104667758A (en) | 2015-02-25 | 2015-02-25 | Negative-pressure coating method |
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| CN201510086950.5A CN104667758A (en) | 2015-02-25 | 2015-02-25 | Negative-pressure coating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828668A (en) * | 2019-10-29 | 2020-02-21 | 浙江工业大学 | Ti-TiO2Preparation of/P3 HT heterojunction fiber, heterojunction photoelectric detector and preparation thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0478331B2 (en) * | 1988-09-29 | 1992-12-10 | Ngk Insulators Ltd | |
| JP2004123533A (en) * | 2002-10-04 | 2004-04-22 | Korea Research Inst Of Chemical Technology | Method of manufacturing silica composite membrane having excellent thermal stability by soaking-rolling method |
| CN103432828A (en) * | 2013-09-23 | 2013-12-11 | 西北有色金属研究院 | Preparation method of porous metal film |
| CN103446806A (en) * | 2013-09-13 | 2013-12-18 | 西北有色金属研究院 | Method for preparing porous material with asymmetric structure |
| CN103752831A (en) * | 2013-12-23 | 2014-04-30 | 南京高谦功能材料科技有限公司 | Porous metal film preparation method |
-
2015
- 2015-02-25 CN CN201510086950.5A patent/CN104667758A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0478331B2 (en) * | 1988-09-29 | 1992-12-10 | Ngk Insulators Ltd | |
| JP2004123533A (en) * | 2002-10-04 | 2004-04-22 | Korea Research Inst Of Chemical Technology | Method of manufacturing silica composite membrane having excellent thermal stability by soaking-rolling method |
| CN103446806A (en) * | 2013-09-13 | 2013-12-18 | 西北有色金属研究院 | Method for preparing porous material with asymmetric structure |
| CN103432828A (en) * | 2013-09-23 | 2013-12-11 | 西北有色金属研究院 | Preparation method of porous metal film |
| CN103752831A (en) * | 2013-12-23 | 2014-04-30 | 南京高谦功能材料科技有限公司 | Porous metal film preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110828668A (en) * | 2019-10-29 | 2020-02-21 | 浙江工业大学 | Ti-TiO2Preparation of/P3 HT heterojunction fiber, heterojunction photoelectric detector and preparation thereof |
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