CN100551874C - A kind of method of in type water-based tape casting film being carried out again flow casting molding - Google Patents
A kind of method of in type water-based tape casting film being carried out again flow casting molding Download PDFInfo
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- CN100551874C CN100551874C CNB2007100401488A CN200710040148A CN100551874C CN 100551874 C CN100551874 C CN 100551874C CN B2007100401488 A CNB2007100401488 A CN B2007100401488A CN 200710040148 A CN200710040148 A CN 200710040148A CN 100551874 C CN100551874 C CN 100551874C
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Abstract
The present invention relates to a kind of method that in type water-based tape casting film is carried out post forming, belong to the casting technique field.Its processing step is: 1. in type water-based tape casting film is placed container, add deionized water, make the casting films dissolving under 90-100 ℃ of violent stirring, form again the slurry of flow casting molding; The addition of deionized water should be with the viscosities il of secondary slurry
1, at room temperature near or equal the viscosities il of the initial slurry that in type water-based tape casting uses
0Be as the criterion; 2. the slurry cool to room temperature that 1. step is made, and carry out vacuum outgas behind the ball milling, vacuum tightness is 600-1000torr during the degassing; 3. the slurry that 2. step is obtained carries out curtain coating, obtains the secondary casting films after the drying.By optimization that first slurry is formed with to the control of secondary forming process, the performance of secondary casting films is suitable with first casting films.Technology is simple and easy to realize that condition is easy to control, is widely used in the recycling of various water-based tape casting films.Avoid the waste of resource.
Description
Technical field
The present invention relates to a kind of in type water-based tape casting film be carried out again the method for flow casting molding, more precisely one-time formed water-based tape casting film is reclaimed and carries out the method for moulding again (being secondary or repeatedly moulding).Also promptly the invention provides a kind of preparation method of the ceramic aqueous tape casting slurry of moulding repeatedly.Belong to field of casting molding processes.
Background technology
The research and development of inorganic ceramic mould material has become one of hot subject in the membrane science technical field at present, flow casting molding is widely used in preparation circuit substrate, electrical condenser and multilayer ceramic etc., become the common method of preparation ceramic membrane, be applicable to large-scale industrial production.Its advantage is that technology is simple, cost is low, film forming thickness is controlled, is that preparation thickness is in the main method of several microns to the flat ceramic material of a hundreds of micron.Casting technique comprises two kinds of water base and non-aqueous tape-castings.The present comparative maturity of non-aqueous tape-casting technology has been applied to industrial production.But non-aqueous tape-casting uses a large amount of poisonous organic solvents, production cost height not only, and be detrimental to health, cause environmental pollution.In contrast to this, water-based tape casting adopts water as solvent, relies on its cost low, and environmental pollution is little, the advantage that HUMAN HEALTH is harmless is more and more paid close attention to and is studied by people, as Al
2O
3, SiC, TiC etc. (Zhang Jingxian etc., patent of invention, 99125697.2)._ have good snappiness by the casting films of flow casting molding preparation, processing such as can shear.Yet, in large-scale industrial production, be sizable by the spillage of material surplus, that waste material brings in the course of processing, not only increased production cost, also caused the significant wastage of social resources.Therefore, the recycling that how to solve old, useless casting films will be the major issue that the casting method industrialization need face.Regrettably up to the present, the report of moisture-free basis casting films recycling still.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method of the ceramic aqueous tape casting slurry of moulding repeatedly.The present invention mainly adopts following technical scheme to be achieved:
Basic step is as follows:
1, in type waste water base casting films is placed container, add proper amount of deionized water, make the casting films dissolving under (500-1000 rev/min) 90-100 ℃ of powerful the stirring, and form the secondary slurry that prolongs again.By to the secondary slurry viscosities il
1Control determine the quality of the water that adds.
2, the slurry that step 1 is obtained is cooled to 18-25 ℃ of room temperature, and carries out vacuum outgas after ball milling 12-48 under this temperature range hour, and vacuum tightness is 600-1000torr, and the degassing time is 15-30min.
3, the slurry that step 2 is obtained carries out curtain coating, obtains the secondary casting films after the drying.
Wherein:
(1) slurry that uses of the described in type water-based tape casting of step 1 is referred to as first slurry, is to be joined in the aqueous solution that contains dispersion agent by ceramic powder, adds after the Ball milling that binding agent and plastic agent be prepared from again.The dispersion agent that uses is the aqueous solution of polyacrylate.Binding agent is polyvinyl alcohol (PVA), and polyvinyl alcohol is a kind of high molecular polymer, odorless, nontoxic, and outward appearance is a white or little yellow is cotton-shaped, sheet or pulverulent solids.Molecular formula is (C
2H
4O) n, partial alcoholysis PVA molecular formula is-(C
2H
4O) n-(C
4H
6O
2) m-, polyvinyl alcohol has better chemical stability and good insulation performance, film-forming properties, its water-soluble different and variant slightly with alcoholysis degree and viscosity.The PVA polymerization degree scope that the present invention adopts is 1200-2000, and the alcoholysis degree scope is 55-99%.Described plastic agent is a polyvalent alcohol, as 1, and 2-propylene glycol, ethylene glycol or 1, ammediol; The mass ratio of binding agent and plastic agent is 0.5-2.0, and the viscosity of initial slurry is 600-900mPas
6
(2) viscosity of described slurry depends primarily on the content of binding agent, and the content of binding agent is high more, and the viscosity of slurry is big more, therefore described first slurry viscosity η
0Can roughly write down the binding agent in the first slurry and the mass ratio of aqueous solvent.Simultaneously, because the mass ratio of binding agent/ceramic powder (X) in the slurry, plastic agent/binding agent (Y) mass ratio is determined, so the mass ratio of mass ratio (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z) is also determined.Therefore, η
0Just write down the proportioning (powder, binding agent, plastic agent and solvent) of each component in the first slurry.
(3) described slurry obtains after the drying in the casting films through flow casting molding, because solvent evaporation, so X, Y remain unchanged, Z increases.
(4) in the preparation process of the described secondary slurry of step 1, revert to first slurry, must add an amount of water, by to secondary slurry viscosities il under the room temperature in order to make the Z in the slurry
1Control determine the quality of the water that adds to make η
1Near or equal η
0
The invention has the advantages that:
1, technological operation is simple, need not complex apparatus, and condition is easy to control, is suitable for industrial applications;
2, the secondary casting films that makes by the recovery waste material is as good as with a casting films on performance, greatly reduces the waste of production cost and resource;
3, method of the present invention has universality, can be widely used in the water-based tape casting film of all kinds of ceramic powders.
Description of drawings
Fig. 1 preparation provided by the invention is the technical process of the method for the ceramic aqueous tape casting slurry of moulding repeatedly.
Embodiment
Further specify characteristics of the present invention below by example, and technical scheme of the present invention is done further concrete the elaboration.
Embodiment 1
With the 100g median size is the Al of 400nm
2O
3Powder joins 25ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 2.0g ball milling 24h.The PVA solution 50g that adds 12wt%, 1,2-propylene glycol 7.2g.Wherein, the binding agent/ceramic powder of slurry (X=0.06), plastic agent/binding agent (Y=1.2), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.64).Continue ball milling 24h, the slurry η that obtains
0=600mPas.Slurry is flow casting molding after vacuum outgas, obtains casting films after the seasoning.
The part casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, ball milling 12h obtains secondary slurry, records its viscosities il
1=600mPas.Secondary slurry is flow casting molding after vacuum outgas, and vacuum outgas vacuum tightness 600-1000torr obtains the secondary casting films after the seasoning.The secondary film has with the similar performance of film.
Embodiment 2
With the 100g median size is the Al of 400nm
2O
3Powder joins 25ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 2.0g ball milling 24h.The PVA solution 50g that adds 12wt%, 1,2-propylene glycol 7.2g.Wherein, the binding agent/ceramic powder of slurry (X=0.06), plastic agent/binding agent (Y=1.2), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.64).Continue ball milling 24h, the slurry η that obtains
0=600mPas.Slurry is flow casting molding after vacuum outgas, and the vacuum outgas time is 30min, obtains casting films after the seasoning.
The part casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, ball milling 12h obtains secondary slurry, records its viscosities il
1=580mPas.Secondary slurry is flow casting molding after vacuum outgas, obtains the secondary casting films after the seasoning.The secondary film has with the similar performance of film
Embodiment 3
With the 100g median size is the Al of 400nm
2O
3Powder joins 25ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 2.0g ball milling 24h.The PVA solution 58.3g that adds 12wt%, 1,2-propylene glycol 7.0g.Wherein, the binding agent/ceramic powder of slurry (X=0.07), plastic agent/binding agent (Y=1.0), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.49).Continue ball milling 24h, the slurry η that obtains
0=770mPas.Slurry is flow casting molding after vacuum outgas, obtains casting films after the seasoning.
The part casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, ball milling 24h obtains secondary slurry, records its viscosities il
1=760mPas.Secondary slurry is flow casting molding after vacuum outgas, obtains the secondary casting films after the seasoning.The secondary film has with the similar performance of film.
Embodiment 4
With the 100g median size is that hydroxyapatite (HA) powder of 440nm joins 28.6ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 1.8g ball milling 60h.The PVA solution 58.3g that adds 12wt%, 1,2-propylene glycol 9.1g.Wherein, the binding agent/ceramic powder of slurry (X=0.07), plastic agent/binding agent (Y=1.3), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.45).Continue ball milling 24h, the slurry η that obtains
0=790mPas.Slurry is flow casting molding after vacuum outgas, obtains casting films after the seasoning.
The part casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, ball milling 24h obtains secondary slurry, records its viscosities il
1=800mPas.Secondary slurry is flow casting molding after vacuum outgas, and the vacuum tightness 800torr900torr of vacuum outgas obtains the secondary casting films after the seasoning.The secondary film has with the similar performance of film.
Embodiment 5
With the 100g median size is that hydroxyapatite (HA) powder of 440nm joins 25ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 1.5g ball milling 72h.The PVA solution 58.3g that adds 12wt%, 1,2-propylene glycol 8.75g.Wherein, the binding agent/ceramic powder of slurry (X=0.07), plastic agent/binding agent (Y=1.25), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.52).Continue ball milling 24h, the slurry η that obtains
0=860mPas.Slurry is flow casting molding after vacuum outgas, obtains casting films after the seasoning.
The part casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, ball milling 24h obtains secondary slurry, records its viscosities il
1=860mPas.Secondary slurry is flow casting molding after vacuum outgas, obtains the secondary casting films after the seasoning.The secondary film has with the similar performance of film.
Embodiment 6
With the 100g median size is that hydroxyapatite (HA) powder of 440nm joins 25ml and contains in the water of dispersion agent polyacrylic acid potassium (PAA-K) 1.5g ball milling 48h.The PVA solution 50g that adds 12wt%, 1,2-propylene glycol 6.0g.Wherein, the binding agent/ceramic powder of slurry (X=0.06), plastic agent/binding agent (Y=1.0), (ceramic powder+binding agent+plastic agent)/aqueous solvent (Z=1.62).Continue ball milling 24h, the slurry η that obtains
0=810mPas.Slurry is flow casting molding after vacuum outgas, obtains casting films after the seasoning.Because ball milling time and plastic agent addition deficiency, the first casting films surface flatness that obtains is relatively poor.
Casting films is put into container, add certain water gaging, and make the casting films dissolving under 90-100 ℃ of powerful the stirring, behind the cool to room temperature, add plastic agent 1.5g, ball milling 48h obtains secondary slurry, records its viscosities il
1=780mPas.Secondary slurry is flow casting molding after vacuum outgas, obtains the secondary casting films after the seasoning.The very big degree of the surface flatness of secondary film improves.This example is as molded water-based tape casting film is improved the inhomogeneity example of casting films by moulding again.
Claims (7)
1, a kind of molded water-based tape casting film is carried out again the method for flow casting molding, its processing step is:
1. in type water-based tape casting film is placed container, add deionized water, under 90-100 ℃ of powerful the stirring, make the casting films dissolving, form again the secondary slurry of flow casting molding; The addition of deionized water should be with the viscosities il of secondary slurry
1, under 18-25 ℃ of temperature, equal the viscosities il of the initial slurry that in type water-based tape casting film uses
0Be as the criterion;
2. the slurry that 1. step is made is cooled to 18-25 ℃ of temperature, and carries out vacuum outgas behind the ball milling, and vacuum tightness is 600-1000torr during the degassing;
3. the slurry that 2. step is obtained carries out curtain coating, obtains the secondary casting films after the drying;
Described initial slurry is to be joined in the aqueous solution that contains dispersion agent by ceramic powder, add binding agent again after the Ball milling and plastic agent is prepared from, the mass ratio of described binding agent and plastic agent is 0.5-2.0, and described binding agent is a polyvinyl alcohol, and described plastic agent is a polyvalent alcohol; Described dispersion agent is a polyacrylic acid potassium.
2, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that the vacuum outgas time is 15-30min.
3, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that the described polyvinyl alcohol polymerization degree is 1200-2000, alcoholysis degree is 55-99%.
4, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that described polyvalent alcohol is 1,2-propylene glycol, ethylene glycol or 1, ammediol.
5, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that the 1. described powerful rotating speed that stirs of step is 500-1000 rev/min.
6, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that the 2. described ball milling time of step is 12-48 hour.
7, by claim 1 is described molded water-based tape casting film is carried out again the method for flow casting molding, it is characterized in that the viscosities il of initial slurry
0Be 600-900mPas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100401488A CN100551874C (en) | 2007-04-27 | 2007-04-27 | A kind of method of in type water-based tape casting film being carried out again flow casting molding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100401488A CN100551874C (en) | 2007-04-27 | 2007-04-27 | A kind of method of in type water-based tape casting film being carried out again flow casting molding |
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| Publication Number | Publication Date |
|---|---|
| CN101100390A CN101100390A (en) | 2008-01-09 |
| CN100551874C true CN100551874C (en) | 2009-10-21 |
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|---|---|---|---|
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| CN101870577B (en) * | 2010-06-25 | 2013-01-02 | 沈阳大学 | Preparation method of magnesium phase-enriched cordierite water-based tape casting slurry |
| CN112909276A (en) * | 2021-03-12 | 2021-06-04 | 华能国际电力股份有限公司 | Method for recovering water-based molten carbonate fuel cell diaphragm waste material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256609A (en) * | 1991-12-18 | 1993-10-26 | W. R. Grace & Co.-Conn. | Clean burning green ceramic tape cast system using atactic polypropylene binder |
| CN1562890A (en) * | 2004-04-16 | 2005-01-12 | 中国科学院上海硅酸盐研究所 | Pulp in use for ceramics powder in water based flow-casting technique |
| CN1803709A (en) * | 2005-12-27 | 2006-07-19 | 中国科学院上海硅酸盐研究所 | Nanometer bismuth titanate aqueous casting slurry and preparation method thereof |
-
2007
- 2007-04-27 CN CNB2007100401488A patent/CN100551874C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256609A (en) * | 1991-12-18 | 1993-10-26 | W. R. Grace & Co.-Conn. | Clean burning green ceramic tape cast system using atactic polypropylene binder |
| CN1562890A (en) * | 2004-04-16 | 2005-01-12 | 中国科学院上海硅酸盐研究所 | Pulp in use for ceramics powder in water based flow-casting technique |
| CN1803709A (en) * | 2005-12-27 | 2006-07-19 | 中国科学院上海硅酸盐研究所 | Nanometer bismuth titanate aqueous casting slurry and preparation method thereof |
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Granted publication date: 20091021 Termination date: 20130427 |