CN1330608C - Method for processing organic foam pattern plate for the preparation of porous ceramic - Google Patents
Method for processing organic foam pattern plate for the preparation of porous ceramic Download PDFInfo
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- CN1330608C CN1330608C CNB2003101093698A CN200310109369A CN1330608C CN 1330608 C CN1330608 C CN 1330608C CN B2003101093698 A CNB2003101093698 A CN B2003101093698A CN 200310109369 A CN200310109369 A CN 200310109369A CN 1330608 C CN1330608 C CN 1330608C
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Abstract
The present invention relates to a method for processing an organic foam pattern plate for the preparation of porous ceramics, which is characterized in that firstly, organic foam is immersed in HCl solution, and then washed and dried, and then immersed in NaOH solution and kneaded softly, and then washed and dried; finally, after the organic foam is immersed in sol, excessive sol is removed through centrifugation, and a thin layer of sol is covered on the surface of the organic foam; the organic foam is then directly dried to obtain an organic pattern plate for the preparation of porous ceramics with a pattern plate method. The present invention can greatly increase roughness on the surface of the organic foam, improve the compatibility of the organic foam and water based pulp, and thus, the pulp can easily wet the organic foam pattern plate and the preparation process of porous ceramics has high pulp amount and uniform slurry. Therefore, the strength and the reliability of the prepared porous ceramics can be further increased. In the process of the present invention, the organic pattern plate with polyurethane foam, polyethylene foam or cellulose foam, etc. can be treated.
Description
Technical field
The present invention relates to a kind of treatment process that is used for the organic foam template of porous ceramics preparation, adopt processing method provided by the present invention, can be easy to obviously increase the roughness on organic foam surface, improve the consistency of itself and water-based slurry, thereby make slurry be very easy to wetting organic foam body.The hanging process can be carried out fully, obtain the foams of even structure.Belong to the porous ceramics preparation field.
Background technology
Porous ceramics is a kind of important multifunctional material.Such porous ceramics is widely used in the filtering flow especially processing, support of the catalyst, solid thermal interchanger, porous burner device etc. of melted metal filtering, high-temperature flue gas.In addition, it also is used to make metal matrix-netted ceramic composite.According to application target different with to material performance requirement, people have prepared the screen like and porous ceramic material of a lot of materials, as silicon oxide, aluminum oxide, mullite, silicon carbide, trichroite, silicon carbide/aluminum oxide, aluminum oxide/mullite, alumina-zirconia, mullite/zirconium white etc.
The preparation technology of porous ceramic film material has a lot: extrusion moulding, add pore-forming material, and ceramic size directly foams, preparation technologies such as template.And the organic foam body impregnation technology in the template is a kind of being coated in equably with ceramic size on the organic foam body with vesicular structure, burns the organic foam body after the drying and obtains porous ceramics.This technology is particularly suitable for preparing high porosity porous pottery, is the most general a kind of technology of preparation porous ceramics.With respect to other forming methods, has the advantage that technology is simple, cost is low.
But because slurry is water base, very poor with organic foam template consistency, so slurry can not abundant wetting foams, make hanging inhomogeneous, the hanging amount is not high, and the porous ceramics of production has a lot of defectives:
● the hole muscle spreading mass of organic foam body applies inhomogeneous.According to the production technique of organic foam body, the cross section of hole muscle all is recessed leg-of-mutton, is difficult to be coated with spreading mass at three sharp corners places; And the thinner more difficult spreading mass that is coated with in position on the muscle of hole.
● the discontinuity of coating, thus after the volatilization of organic foam body, hole muscle surface and inside stay big defectives such as crackle.
Above-mentioned these hole muscle very thin, that the surface has crackle are very responsive to load, stress concentration can occur in practical application (filtering as molten metal bath), the structure properties of material and reliability are reduced greatly, thereby cause catastrophic destruction.
In order to increase the consistency of organic foam body and slurry, the organic foam body a lot of processing have been done both at home and abroad.At least can list following three kinds of reports:
People (U.S.Pat.No.3972834 such as 1 Washbourne, Blome, U.S.Pat.No.4265659) before organic foam body dipping, its surface spray graphite fibre, organic fibre are waited the adhesivity of improving its surface and slurry, the mud layer that applies on the network hole wall is thickened;
2 Hargus (U.S.Pat.No.4866011) are by the organic foam surface being handled with binding agent, the surface and the adhesivity of slurry being increased, thereby the hanging amount is improved.
3 before dipping, Ravault (U.S.Pat.No.4004933) adopts polymers soln, divalence and tervalent metal ion solution etc. that organic foam is carried out surface modification, and the organic foam body is when dipping, and the slurry on surface can condense, thereby improve the hanging amount, make hanging more even.
Yet above method all has oneself shortcoming.Organic fibre and graphite fibre generally all are not hydrophilic, and this method just improves wettability by the roughness that increases the surface.Then both do not consider that added properties-correcting agent has adverse influence to slurry.
Summary of the invention
The object of the invention is to provide a kind of treatment process that is used for the organic foam of template that relates to, the shortcoming of the method for having enumerated more than present method has overcome, consider from two aspects:, improve slurry wetting to the organic foam body on the one hand by increasing the roughness on surface; By colloidal sol modification is carried out on the surface on the other hand.Because the consistency of colloidal sol and water-based slurry is very good, so, just can increase the consistency of slurry and organic foam body by applying; And colloidal sol is to decide according to paste composition, can be converted into the composition of pottery in sintering process, can not produce pottery and pollute.Manageable organic formwork has multiple foams, includes urethane foam, polyethylene foam and cellulose foam etc.
Main implementation process of the present invention is:
1 organic foam body is put into the HCl acid solution and is soaked, or rubs gently, or ball milling soaked 10-30 hour, washs then, drying; The concentration of employed HCl acid solution is 0.5-2mol/L
2 will the organic foam after acid treatment puts into the NaOH alkaline solution and soaks, or rubs gently, or ball milling soaked 10-30 hour, washs then, drying; The concentration of employed NaOH alkaline solution is 0.5-2mol/L.
3 will put into according to paste composition after selected colloidal sol soaks 1 hour through the organic foam body that (1) (2) are handled well again, take out that the back is centrifugal gets rid of unnecessary colloidal sol, make foam surface cover skim colloidal sol, dry then.
Obviously, the acid solution of use and alkaline solution handle the organic foam bulk concentration can not be too high can not be too low; Too high meeting makes the organic foam body impaired, does not too lowly have an effect; Used acid is not confined to HCl, and used alkali is not confined to NaOH, and just HCl, NaOH are the most frequently used bronsted lowry acids and bases bronsted lowries, and convenient for washing is volatile under the high temperature, does not stay detrimental impurity.
Obviously, the treatment process that is used for the organic foam body of template provided by the invention has following advantage:
(a) operation is simple, only needs immersion treatment just can obtain and the good organic foam template of slurry consistency.
(b) this technology is not single from surfaceness or consistency, but improves simultaneously from two aspects: on the one hand by increasing the roughness on surface, improve slurry wetting to the organic foam body; By colloidal sol modification is carried out on the surface on the other hand, increased the consistency of slurry and organic foam body; Thereby can increase the hanging amount greatly, improve the homogeneity of hanging.
(c) in acid, in the alkaline solution treating processes, some in the foams are unfavorable for that the impurity of ceramics component can be dissolved in acid, alkali, have played the effect that purifies foams simultaneously, make the prepared product composition can be by contaminating impurity.And as when adopting highly purified Mierocrystalline cellulose foam, can economize disacidify, alkaline solution treatment step, directly enter the 3rd step sol impregnation process.
(d) colloidal sol all is to decide according to paste composition, and dry meeting later on can not come off in the steeping process in the back attached to the organic foam surface, can be converted into ceramics component in the sintering process, can not produce pottery and pollute.Simultaneously, dried colloidal sol also has certain supporting role to foams, has improved the elasticity of foams, makes foams easier maintaining the original state in preparation process, unlikely distortion.
Description of drawings
Fig. 1 polyurethane foam surface Photomicrograph (right half part) that is untreated.
Polyurethane foam surface Photomicrograph after Fig. 2 process HCl and the NaOH solution-treated.
Polyurethane foam Surface Microstructure photo after Fig. 3 handles through silicon sol.
Before and after Fig. 4 surface modification, the variation of hanging amount.
Ordinate is the hanging amount among the figure, two black boxs about abscissa, hanging amount before and after the presentation surface modification respectively.
Embodiment
Below example be in order further to illustrate technological process substantive distinguishing features provided by the invention and obvious improvement, but the present invention only is confined to embodiment by no means, the also also unrestricted the present invention of embodiment.
Used foam is a polyurethane foam, and its surperficial Photomicrograph is seen Fig. 1.Undressed as can be seen surface is very smooth among the figure, is unfavorable for the wetting of slurry.
At first, polyurethane foam is put into a ball grinder, adding an amount of concentration is the HCl acid solution of 1mol/L, and ball milling 24 hours takes out washing, drying then;
Then, will put into a ball grinder through the polyurethane foam that the HCl acid solution was handled, adding an amount of concentration is the NaOH solution of 1mol/L, and ball milling 24 hours takes out washing, drying then.So far, the Photomicrograph on polyurethane foam surface is seen Fig. 2.As can be seen from Figure, become coarse, can make the easier wetting organic foam body of slurry like this through foam surface after handling.
At last, polyurethane foam is put into the silicon sol the inside, soaked 3 hours, promptly can be used for preparing porous silicon nitride ceramic after the taking-up drying.The Photomicrograph on the polyurethane foam surface of handling well is seen Fig. 3.Can go out dried silicon sol among the figure attached to foam surface, and produce a lot of " wrinkle ", the roughness on surface is increased.Thereby not only increased the consistency of foams and slurry, simultaneously also increased surperficial roughness, made the easier wetting organic foam body of slurry.The hanging amount has improved more than 35% as shown in Figure 4.Because the raising of hanging amount makes that the gained porous ceramic structure is more even, has reduced generation of defects.Not only improved intensity, reliability of material also is greatly improved.
Claims (4)
1. treatment process that is used for the organic foam template of porous ceramics preparation is characterized in that comprising that three steps handled: at first, the organic foam body is put into the HCl acid solution soak, wash then, drying; Put into the NaOH alkaline solution again and soak, rub gently simultaneously, wash then, drying; At last, after putting into colloidal sol and soaking, centrifugally get rid of unnecessary colloidal sol, make foam surface cover skim colloidal sol, convection drying promptly can be made into and is used for the organic foam template that template prepares porous ceramics; Described colloidal sol is silicon sol or aluminium colloidal sol.
2. by the described treatment process that is used for the organic foam template of porous ceramics preparation of claim 1, it is characterized in that described organic foams are a kind of in urethane foam, polyethylene foam, the cellulose foam.
3. by the described treatment process that is used for the organic foam template of porous ceramics preparation of claim 1, it is characterized in that the HCl acid solutions is 0.5-2mol/L, soaked 10-30 hour: immersion is to carry out in ball grinder; Or rub gently.
4. by the described treatment process that is used for the organic foam template of porous ceramics preparation of claim 1, it is characterized in that the NaOH alkaline concentration is 0.5-2mol/L, soaked 10-30 hour; Immersion is to carry out in ball grinder; Or rub gently.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101093698A CN1330608C (en) | 2003-12-12 | 2003-12-12 | Method for processing organic foam pattern plate for the preparation of porous ceramic |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101093698A CN1330608C (en) | 2003-12-12 | 2003-12-12 | Method for processing organic foam pattern plate for the preparation of porous ceramic |
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| CN1546432A CN1546432A (en) | 2004-11-17 |
| CN1330608C true CN1330608C (en) | 2007-08-08 |
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| CNB2003101093698A Expired - Fee Related CN1330608C (en) | 2003-12-12 | 2003-12-12 | Method for processing organic foam pattern plate for the preparation of porous ceramic |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484210B (en) * | 2018-06-01 | 2020-12-08 | 阜阳市鑫源建材有限公司 | Preparation method of silicon carbide porous ceramic with high porosity |
| CN110981533A (en) * | 2019-12-18 | 2020-04-10 | 上栗县上栗镇中心小学 | Process for preparing porous ceramic by organic foam impregnation method |
| CN111285693A (en) * | 2020-03-19 | 2020-06-16 | 江苏禾吉新材料科技有限公司 | Porous silicon nitride filter ceramic and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866011A (en) * | 1988-05-02 | 1989-09-12 | Swiss Aluminium, Ltd. | Process for forming a ceramic foam |
| CN1287989A (en) * | 2000-10-27 | 2001-03-21 | 中国科学院上海硅酸盐研究所 | Method for mfg. high strength, screen like and porous ceramic |
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2003
- 2003-12-12 CN CNB2003101093698A patent/CN1330608C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4866011A (en) * | 1988-05-02 | 1989-09-12 | Swiss Aluminium, Ltd. | Process for forming a ceramic foam |
| CN1287989A (en) * | 2000-10-27 | 2001-03-21 | 中国科学院上海硅酸盐研究所 | Method for mfg. high strength, screen like and porous ceramic |
Non-Patent Citations (1)
| Title |
|---|
| 有机泡沫浸渍工艺－一种经济实用的多孔陶瓷制备工艺 朱新文 江东亮，硅酸盐通报，第3期 2000 * |
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