CN209721959U - The system for preparing Diatomite-based Porous Ceramics - Google Patents
The system for preparing Diatomite-based Porous Ceramics Download PDFInfo
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- CN209721959U CN209721959U CN201920083288.1U CN201920083288U CN209721959U CN 209721959 U CN209721959 U CN 209721959U CN 201920083288 U CN201920083288 U CN 201920083288U CN 209721959 U CN209721959 U CN 209721959U
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Abstract
The utility model discloses a kind of system for preparing Diatomite-based Porous Ceramics, which includes: mixing arrangement, has diatomite entrance, sintering aid entrance, pore creating material entrance and mixed powder outlet；There is kneading device paraffin entrance, modifier inlet, mixed powder entrance and mixing materials outlet, the mixed powder entrance to be connected with mixed powder outlet；There is hot die-casting molding device mixing materials entrance and molding mass to export, and the mixing materials entrance is connected with mixing materials outlet；De-waxing device, has molding mass entrance and except wax material exports, the molding mass entrance is connected with molding mass outlet；Sintering equipment has except wax material entrance and Diatomite-based Porous Ceramics export, described to be connected except wax material entrance with the wax material outlet that removes.The system uses organic micro-spheres as pore creating material, and uses hot die-casting molding technique, has obtained even air hole distribution, porosity 40-70%, the Diatomite-based Porous Ceramics that pore size is 5-20 μm and compression strength is 5-20MPa.
Description
Technical field
The utility model belongs to porous ceramics field, specifically, the utility model relates to prepare Diatomite-based Porous pottery
The system of porcelain.
Background technique
Porous ceramics is due to its unique property, and with anti-oxidant, high temperature resistant, corrosion-resistant, pore structure is uniform, specific surface area is high
With the characteristics such as extensive, the at low cost, long service life of raw material sources, it is widely used in energy-saving and environmental protection, petroleum, chemical industry, food etc.
Field, and receive more and more attention in recent years.
The main method for preparing porous ceramics at present has mechanical extrusion molding, particle packing, addition organic pore-forming agents, addition
Inorganic pore creating material and foaming, freeze-drying and gel injection-moulding method, Major Difficulties are how to realize accurately to control porous pottery
How pore size, hole pattern and the pore size distribution of porcelain make to keep compatible compression strength while improving porosity, and how to drop
Low cost.It uses organic foam small-sphere for pore former in the prior art, and porous ceramics is prepared by the technique of injection moulding.It should
Technique pre-processes organic foam small-sphere using paraffin solution, carries out surface to ceramic powder and glass agent using oleic acid
Processing, complex process are readily incorporated impurity and pollute, and the porous ceramics intensity prepared is lower, is unfavorable for actual industrial and answers
With.
Therefore, the preparation process of existing porous ceramics is further improved.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of system for preparing Diatomite-based Porous Ceramics with a novel purpose.The system uses organic micro-spheres conduct
Pore creating material, and hot die-casting molding technique is used, obtain even air hole distribution, porosity 40-70%, pore size 5-20
μm and compression strength be 5-20MPa Diatomite-based Porous Ceramics.
In the one aspect of the utility model, the utility model proposes it is a kind of prepare Diatomite-based Porous Ceramics be
System, embodiment according to the present utility model, the system include:
Mixing arrangement, the mixing arrangement have diatomite entrance, sintering aid entrance, pore creating material entrance and mixed powder
Outlet；
There are paraffin entrance, modifier inlet, mixed powder entrance and mixing materials to go out for kneading device, the kneading device
Mouthful, the mixed powder entrance is connected with mixed powder outlet；
There is mixing materials entrance and molding mass to export for hot die-casting molding device, the hot die-casting molding device, the mixing
Material entrance is connected with mixing materials outlet；
De-waxing device, the de-waxing device have molding mass entrance and except wax material export, the molding mass entrance with it is described
Molding mass outlet is connected；
Sintering equipment, the sintering equipment has except wax material entrance and Diatomite-based Porous Ceramics export, described to remove wax material
Entrance is with described except wax material outlet is connected.
According to the preparation system of the Diatomite-based Porous Ceramics of the utility model embodiment, by the way that diatomite and sintering are helped
Agent, pore creating material are mixed, and are conducive to improve the efficiency of subsequent mixing and the uniformity of mixing materials；By by mixed powder and stone
Wax, modifying agent are kneaded, and modifying agent can improve the wetability and mobility of diatomite and paraffin, can further improve mixed powder with
The melting efficiency and melting effect of paraffin；Mixing materials molding uses simple hot die-casting molding technique, can significantly reduce cost；At
Moulding mixture can be obtained in cavernous except wax material, which is handled except wax material is conducive to raising follow-up sintering after de-waxing is handled
Efficiency and effect；By that will be sintered except wax material, pore creating material volatilization therein, so that the pore size distribution of ceramic surface is more equal
It is even, while increasing porosity, sintering aid advantageously reduces the sintering temperature except wax material, further increases the effect of sintering processes
Rate.Using the technique can be obtained as a result, porosity is 5-20 μm for 40-70%, pore size and compression strength is 5-20MPa's
Diatomite-based Porous Ceramics have the characteristics that porosity is high, even pore distribution, and have enough intensity be able to satisfy petroleum,
The application requirement of the industry such as chemical industry, energy.
In addition, according to the preparation system of the Diatomite-based Porous Ceramics of the utility model above-described embodiment can also have as
Under additional technical characteristic:
Optional, the kneading device is to mix wax machine or kneading machine.Be conducive to improve mixed powder and paraffin as a result, change
The melting effect of property agent.
Optional, the hot die-casting molding device is hot injection moulding machine.The cost for advantageously reducing technique as a result, is protected simultaneously
The intensity of card gained porous ceramics.
Optional, the de-waxing device is wax expelling furnace.Be conducive to improve the de-waxing effect of molding mass as a result,.
Optional, the sintering equipment is sintering furnace or tunnel kiln.Be conducive to improve except the sintering of wax material is imitated as a result,
Fruit obtains porosity high, even pore distribution and there is enough intensity to be able to satisfy the industrial applications such as petroleum, chemical industry, the energy want
The Diatomite-based Porous Ceramics asked.
The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 is the system structure diagram for preparing Diatomite-based Porous Ceramics according to the utility model one embodiment；
Fig. 2 is that the system for preparing Diatomite-based Porous Ceramics according to the use of the utility model one embodiment prepares diatom
The method flow schematic diagram of soil matrix porous ceramics；
Fig. 3 is that the system for preparing Diatomite-based Porous Ceramics according to the use of the utility model further embodiment prepares silicon
The method flow schematic diagram of diatomaceous earth base porous ceramics.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element, unless otherwise restricted clearly.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the one aspect of the utility model, the utility model proposes it is a kind of prepare Diatomite-based Porous Ceramics be
System, embodiment according to the present utility model, with reference to Fig. 1, which includes: that mixing arrangement 100, kneading device 200, hot pressing are cast
Type device 300, de-waxing device 400 and sintering equipment 500.
Embodiment according to the present utility model, mixing arrangement 100 have diatomite entrance 101, sintering aid entrance 102,
Pore creating material entrance 103 and mixed powder outlet 104, and be suitable for diatomite, sintering aid and pore creating material carrying out mixed processing, with
Just mixed powder is obtained.Inventors have found that being conducive to improve silicon by mixing diatomite with sintering aid, pore creating material
The contact area of diatomaceous earth and sintering aid, pore creating material, and then improve subsequent melting efficiency and melting effect.Sintering aid is in high temperature
Under will form liquid phase, the sintering temperature of porous ceramics can be reduced；Pore creating material can volatilize under high temperature sintering, to stay in ceramics
Corresponding stomata down.It should be noted that mixing arrangement is not particularly restricted, those skilled in the art can be according to practical need
It is selected, such as can be ball mill or tumbling mill etc..
The concrete type of one embodiment according to the present utility model, sintering aid is not particularly restricted, this field skill
Art personnel can select according to actual needs, such as can be for low temperature and without the glass powder of heavy metal, the grain of glass powder
Degree is 1000-3200 mesh, and melt temperature is 500-1000 DEG C.Preferably, the granularity of above-mentioned glass powder is 1500-2500 mesh, is melted
Changing temperature is 600-800 DEG C.Inventors have found that sintering aid will form liquid phase at high temperature, the sintering of porous ceramics can be reduced
Temperature.Sintering aid selects low temperature and is free of the glass powder of heavy metal, then sintering aid can be completed to burn under cryogenic
Knot reduces sintering energy consumption, reduces process costs, and be free of heavy metal, environmental protection, and use is safe.The granularity of glass powder is excessively high too low
The distribution of the liquid phase in ceramic matrix when sintering aid melts will be influenced, and then influences the distribution and size in hole.Melt temperature
Excessively high, sintering temperature can also increase, and aperture and porosity can become smaller；Melting temperature is too low, and sintering temperature also can be too low, in ceramics
It can residual organic matter.
The concrete type of further embodiment according to the present utility model, pore creating material is not particularly restricted, this field skill
Art personnel can select according to actual needs, such as can be polystyrene microsphere, poly (methyl methacrylate) micro-sphere, gather
At least one of urethane microballoon, polypropylene microballoon and polyvinyl chloride microballoon.Preferably, pore creating material is polystyrene microsphere and gathers
At least one of methyl methacrylate microballoon.Inventors have found that pore creating material can volatilize under high temperature sintering, thus in ceramics
In leave corresponding stomata.Polystyrene microsphere and poly (methyl methacrylate) micro-sphere volatilization temperature are lower than sintering temperature, and wave
Send out noresidue, good sphericity.
Another embodiment according to the present utility model, the partial size of pore creating material can be 8-20 μm.Inventors have found that pore-creating
The particle size of agent determines the pore size of final porous ceramics, too large or too small all to reduce final gained porous ceramics
Quality.Inventor has found that the pore creating material of above-mentioned partial size may make the quality of porous ceramics more excellent by many experiments.
Another embodiment according to the present utility model, diatomite and sintering aid, pore creating material mixing mass ratio not
It is particularly limited, those skilled in the art can select according to actual needs, such as can be (40-70): (0-20):
(5-30).Preferably, the mixing mass ratio of diatomite and sintering aid, pore creating material is (50-60): (5-10): (10-15).Hair
The mixing mass ratio of bright people discovery, diatomite and sintering aid, pore creating material is excessively high too low all to directly affect final porous ceramics
Porosity pore structure, pore size distribution, Kong great little and ceramics strength.Inventor has found that said ratio can be significant by many experiments
Improve porosity pore structure, pore size distribution, Kong great little and the ceramics strength of porous ceramics.
Embodiment according to the present utility model, kneading device 200 have paraffin entrance 201, modifier inlet 202, mixing
Powder entrance 203 and mixing materials outlet 204, mixed powder entrance 203 are connected with mixed powder outlet 104, and are suitable for mix
Powder is kneaded with paraffin, modifying agent, to obtain mixing materials.Inventors have found that by by mixed powder and paraffin, modification
Agent is kneaded, and modifying agent can improve the wetability and mobility of diatomite and paraffin, can further improve mixed powder and paraffin
Melting efficiency and melting effect.Paraffin can melt within the scope of melt temperature as liquid phase, dissolve mixed powder, may act as solvent
Effect.It should be noted that kneading device is not particularly restricted, those skilled in the art can select according to actual needs
It selects, such as can be to mix wax machine or kneading machine.
Paraffin, modifying agent can be mixed first, are heated in kneading device by one embodiment according to the present utility model
It is paraffin melting, to obtain containing the mixture for melting paraffin.Inventors have found that by first will be paraffin melting, then again with it is mixed
It closes powder to be kneaded, is conducive to that mixed powder uniform dissolution is mechanically allowed to be dispersed in paraffin solution.It is practical according to this
A novel specific embodiment, modifying agent can be at least one of stearic acid or oleic acid.Preferably, modifying agent can be
Stearic acid.Inventors have found that modifying agent can improve the wetability and mobility of diatomite and paraffin, mixed powder can further improve
The melting efficiency and melting effect of body and paraffin.Stearic acid or oleic acid can significantly improve the rheological characteristic of diatomite and paraffin, increase
The mobility of mixing materials.
The mixing mass ratio of another specific embodiment according to the present utility model, paraffin and modifying agent can be (20-
50): (0-20).Preferably, the mixing mass ratio of paraffin and modifying agent is (20-30): (5-10).Inventors have found that paraffin with
The too high or too low mobility that can all influence mixing materials of the mixing mass ratio of modifying agent, and then influence the effect of subsequent hot die-casting molding
Fruit, or even cause not forming.
Further embodiment according to the present utility model, it is to be obtained containing melt paraffin mixture after, by mixed powder
With containing melt paraffin mixture mixed milling, to obtain the mixing materials.Inventors have found that containing the mixed of paraffin is melted
Closing material is liquid phase, is equivalent to solvent, and mixed powder is added in solvent and is kneaded together, ceramic powder can be allowed uniformly to be dissolved in and contained
Have in the mixture for melting paraffin.
There is mixing materials entrance 301 and molding mass to export for embodiment according to the present utility model, hot die-casting molding device 300
302, mixing materials entrance 301 is connected with mixing materials outlet 204, and is suitable for mixing materials carrying out hot die-casting molding, to obtain into
Moulding mixture.Inventors have found that mixing materials molding uses simple hot die-casting molding technique, cost can be significantly reduced.Meanwhile using heat
Die cast can form the product of labyrinth, not need additional processing, be a kind of dead size moulding process.It needs to illustrate
It is that hot die-casting molding device is not particularly restricted, those skilled in the art can select according to actual needs, such as can
Think hot injection moulding machine.
One embodiment according to the present utility model, the temperature of hot die-casting molding can be 50-80 DEG C, preferably 60-70 DEG C,
Pressure can be 1-3MPa, preferably 1.8-2.5MPa.Inventors have found that the extremes of temperature of hot die-casting molding, pressure are excessive
The too small density that can all directly affect molding mass, causes molding mass to have the defects of many stomatas, hole.
Embodiment according to the present utility model, de-waxing device 400 have molding mass entrance 401 and except wax material export 402, at
Moulding mixture entrance 401 is connected with molding mass outlet 302, and is suitable for molding mass carrying out de-waxing processing, to obtain except wax material.Invention
People's discovery, molding mass can be obtained in cavernous after de-waxing is handled except wax material, the shape except wax material be conducive to improve it is subsequent
The efficiency and effect of sintering processes.By formulating reasonable binder burnout temperature and de-waxing rate, the paraffin in molding mass can be allowed slow
Melt and volatilizees.It should be noted that de-waxing device is not particularly restricted, those skilled in the art can be according to actual needs
It is selected, such as can be wax expelling furnace.Further, molding mass entrance and except wax material outlet can be the same mouth.
The temperature of one embodiment according to the present utility model, de-waxing processing can be room temperature to 400 DEG C, preferably 350-
380 DEG C, and at 200 DEG C or less de-waxing handle heating rate can be 0.2-1.0 DEG C/min, preferably 0.5-0.8 DEG C/min,
The heating rate that de-waxing is handled at 200 DEG C or more can be 0.5-2 DEG C/min, preferably 1 DEG C/min.Inventors have found that at de-waxing
The temperature and heating rate of reason are formulated according to the melting point of paraffin and volatilization point, the melt temperature and volatilization temperature of paraffin
Both less than 200 DEG C of degree, before paraffin merges and volatilizees, if heating rate is too fast, it will lead to deformation of products, or even cracking；And
After paraffin volatilization, energy consumption can be dramatically increased if heating rate is too low, reduces efficiency, increase cost.
Embodiment according to the present utility model, sintering equipment 500, which has, removes wax material entrance 501 and Diatomite-based Porous Ceramics
Outlet 502 except wax material entrance 501 is connected with except wax material exports 402, and is suitable for be sintered except wax material, to obtain
Diatomite-based Porous Ceramics.Inventors have found that by that will be sintered except wax material, pore creating material volatilization therein, so that ceramic watch
The pore size distribution in face is more uniform, ceramic densifying, while increasing porosity, and sintering aid advantageously reduces the sintering temperature except wax material
Degree, further increases the efficiency of sintering processes.It can assign ceramics certain mechanical property by being sintered.It should be noted that burning
Knot device is not particularly restricted, and those skilled in the art can select according to actual needs, such as can be sintering furnace
Or tunnel kiln.Further, except wax material entrance and Diatomite-based Porous Ceramics outlet can be the same mouth.
One embodiment according to the present utility model, the temperature of sintering processes can be 500-900 DEG C, preferably 600-700
DEG C, heating rate can be 1-5 DEG C/min, and preferably 3 DEG C/min, soaking time can be 0.5-2h, preferably 1-1.5h.Inventor
It was found that the temperature of sintering processes is excessively high, heating rate it is excessively high it is too low, soaking time is too long can all make ceramic burning so that more
Hole ceramics porosity reduces, and aperture is too small.And if the temperature of sintering processes is too low, soaking time is too short, then final gained ceramics
Sintering strength it is too low, the performance requirement of product is not achieved.In short, temperature, heating rate and soaking time can all directly affect
Intensity, hardness, porosity and the pore size of final ceramics.
Further embodiment according to the present utility model, by using the above-mentioned preparation process of the application, obtained diatom
The porosity of soil matrix porous ceramics reach 40-70%, intensity 5-20MPa, aperture be 5-20 μm, and porosity be up to 60% and
When above, intensity may remain in 10MPa or more, compared with existing preparation process, have significant progress.
According to the preparation system of the Diatomite-based Porous Ceramics of the utility model embodiment, by the way that diatomite and sintering are helped
Agent, pore creating material are mixed, and are conducive to improve the efficiency of subsequent mixing and the uniformity of mixing materials；By by mixed powder and stone
Wax, modifying agent are kneaded, and modifying agent can improve the wetability and mobility of diatomite and paraffin, can further improve mixed powder with
The melting efficiency and melting effect of paraffin；Mixing materials molding uses simple hot die-casting molding technique, can significantly reduce cost；At
Moulding mixture can be obtained in cavernous except wax material, which is handled except wax material is conducive to raising follow-up sintering after de-waxing is handled
Efficiency and effect；By that will be sintered except wax material, pore creating material volatilization therein, so that the pore size distribution of ceramic surface is more equal
It is even, while increasing porosity, sintering aid advantageously reduces the sintering temperature except wax material, further increases the effect of sintering processes
Rate.Using the technique can be obtained as a result, porosity is 5-20 μm for 40-70%, pore size and compression strength is 5-20MPa's
Diatomite-based Porous Ceramics have the characteristics that porosity is high, even pore distribution, and have enough intensity be able to satisfy petroleum,
The application requirement of the industry such as chemical industry, energy.
In order to facilitate understanding, implement preparation diatom soil matrix to using the above-mentioned system for preparing Diatomite-based Porous Ceramics below
The method of porous ceramics is described in detail, embodiment according to the present utility model, with reference to Fig. 2, this method comprises:
S100: diatomite, sintering aid and pore creating material are subjected to mixed processing
In the step, diatomite, sintering aid and pore creating material are subjected to mixed processing, to obtain mixed powder.Invention
People's discovery is conducive to improve diatomite and sintering aid, pore-creating by mixing diatomite with sintering aid, pore creating material
The contact area of agent, and then improve subsequent melting efficiency and melting effect.Sintering aid will form liquid phase at high temperature, can reduce
The sintering temperature of porous ceramics；Pore creating material can volatilize under high temperature sintering, to leave corresponding stomata in ceramics.
The concrete type of one embodiment according to the present utility model, sintering aid is not particularly restricted, this field skill
Art personnel can select according to actual needs, such as can be for low temperature and without the glass powder of heavy metal, the grain of glass powder
Degree is 1000-3200 mesh, and melt temperature is 500-1000 DEG C.Preferably, the granularity of above-mentioned glass powder is 1500-2500 mesh, is melted
Changing temperature is 600-800 DEG C.Inventors have found that sintering aid will form liquid phase at high temperature, the sintering of porous ceramics can be reduced
Temperature.Sintering aid selects low temperature and is free of the glass powder of heavy metal, then sintering aid can be completed to burn under cryogenic
Knot reduces sintering energy consumption, reduces process costs, and be free of heavy metal, environmental protection, and use is safe.The granularity of glass powder is excessively high too low
The distribution of the liquid phase in ceramic matrix when sintering aid melts will be influenced, and then influences the distribution and size in hole.Melt temperature
Excessively high, sintering temperature can also increase, and aperture and porosity can become smaller；Melting temperature is too low, and sintering temperature also can be too low, in ceramics
It can residual organic matter.
The concrete type of further embodiment according to the present utility model, pore creating material is not particularly restricted, this field skill
Art personnel can select according to actual needs, such as can be polystyrene microsphere, poly (methyl methacrylate) micro-sphere, gather
At least one of urethane microballoon, polypropylene microballoon and polyvinyl chloride microballoon.Preferably, pore creating material is polystyrene microsphere and gathers
At least one of methyl methacrylate microballoon.Inventors have found that pore creating material can volatilize under high temperature sintering, thus in ceramics
In leave corresponding stomata.Polystyrene microsphere and poly (methyl methacrylate) micro-sphere volatilization temperature are lower than sintering temperature, and wave
Send out noresidue, good sphericity.
Another embodiment according to the present utility model, the partial size of pore creating material can be 8-20 μm.Inventors have found that pore-creating
The particle size of agent determines the pore size of final porous ceramics, too large or too small all to reduce final gained porous ceramics
Quality.Inventor has found that the pore creating material of above-mentioned partial size may make the quality of porous ceramics more excellent by many experiments.
Another embodiment according to the present utility model, diatomite and sintering aid, pore creating material mixing mass ratio not
It is particularly limited, those skilled in the art can select according to actual needs, such as can be (40-70): (0-20):
(5-30).Preferably, the mixing mass ratio of diatomite and sintering aid, pore creating material is (50-60): (5-10): (10-15).Hair
The mixing mass ratio of bright people discovery, diatomite and sintering aid, pore creating material is excessively high too low all to directly affect final porous ceramics
Porosity pore structure, pore size distribution, Kong great little and ceramics strength.Inventor has found that said ratio can be significant by many experiments
Improve porosity pore structure, pore size distribution, Kong great little and the ceramics strength of porous ceramics.
S200: mixed powder and paraffin, modifying agent are kneaded
In the step, mixed powder and paraffin, modifying agent are kneaded, to obtain mixing materials.Inventors have found that logical
It crosses and is kneaded mixed powder and paraffin, modifying agent, modifying agent can improve the wetability and mobility of diatomite and paraffin, can be into one
Step improves the melting efficiency and melting effect of mixed powder and paraffin.Paraffin can melt within the scope of melt temperature as liquid phase, molten
Mixed powder is solved, may act as the effect of solvent.
One embodiment according to the present utility model includes: with reference to Fig. 3, S200
S21: paraffin, modifying agent are mixed, are heated to paraffin melting
In the step, by paraffin, modifying agent mix, be heated to it is paraffin melting, so as to obtain containing thawing paraffin mixing
Material.Inventors have found that being then kneaded again with mixed powder by first will be paraffin melting, being conducive to mechanically allow mixed
Powder uniform dissolution is closed to be dispersed in paraffin solution.
A specific embodiment according to the present utility model, modifying agent can be at least one of stearic acid or oleic acid.
Preferably, modifying agent can be stearic acid.Inventors have found that modifying agent can improve the wetability and flowing of diatomite and paraffin
Property, it can further improve the melting efficiency and melting effect of mixed powder and paraffin.Stearic acid or oleic acid can significantly improve diatom
The rheological characteristic of soil and paraffin, increases the mobility of mixing materials.
The mixing mass ratio of another specific embodiment according to the present utility model, paraffin and modifying agent can be (20-
50): (0-20).Preferably, the mixing mass ratio of paraffin and modifying agent is (20-30): (5-10).Inventors have found that paraffin with
The too high or too low mobility that can all influence mixing materials of the mixing mass ratio of modifying agent, and then influence the effect of subsequent hot die-casting molding
Fruit, or even cause not forming.
S22: by mixed powder and the mixture mixed milling containing thawing paraffin
In the step, by mixed powder and the mixture mixed milling containing thawing paraffin, to obtain mixing materials.Invention
People's discovery, is liquid phase containing the mixture for melting paraffin, is equivalent to solvent, and mixed powder is added in solvent and is kneaded together, can
Ceramic powder is allowed uniformly to be dissolved in containing in the mixture for melting paraffin.
S300: mixing materials are subjected to hot die-casting molding
In the step, mixing materials are subjected to hot die-casting molding, to obtain molding mass.Inventors have found that mixing materials form
Using simple hot die-casting molding technique, cost can be significantly reduced, meanwhile, labyrinth can be formed using hot die-casting molding
Product does not need additional processing, is a kind of dead size moulding process.
One embodiment according to the present utility model, the temperature of hot die-casting molding can be 50-80 DEG C, preferably 60-70 DEG C,
Pressure can be 1-3MPa, preferably 1.8-2.5MPa.Inventors have found that the extremes of temperature of hot die-casting molding, pressure are excessive
The too small density that can all directly affect molding mass, causes molding mass to have the defects of many stomatas, hole.
S400: molding mass is subjected to de-waxing processing
In the step, molding mass is subjected to de-waxing processing, to obtain except wax material.Inventors have found that molding mass is through de-waxing
After processing, it can obtain in cavernous except wax material, the efficiency and effect removing wax material and be conducive to improve follow-up sintering processing of the shape
Fruit.By formulating reasonable binder burnout temperature and de-waxing rate, the paraffin in molding mass can be allowed slowly to melt and volatilize.
The temperature of one embodiment according to the present utility model, de-waxing processing can be room temperature to 400 DEG C, preferably 350-
380 DEG C, and at 200 DEG C or less de-waxing handle heating rate can be 0.2-1.0 DEG C/min, preferably 0.5-0.8 DEG C/min,
The heating rate that de-waxing is handled at 200 DEG C or more can be 0.5-2 DEG C/min, preferably 1 DEG C/min.Inventors have found that at de-waxing
The temperature and heating rate of reason are formulated according to the melting point of paraffin and volatilization point, the melt temperature and volatilization temperature of paraffin
Both less than 200 DEG C of degree, before paraffin merges and volatilizees, if heating rate is too fast, it will lead to deformation of products, or even cracking；And
After paraffin volatilization, energy consumption can be dramatically increased if heating rate is too low, reduces efficiency, increase cost.
S500: it will be sintered except wax material
It in the step, will be sintered except wax material, to obtain Diatomite-based Porous Ceramics.Inventors have found that logical
Crossing will be except wax material be sintered, pore creating material volatilization therein, so that the pore size distribution of ceramic surface is more uniform, ceramic densifying,
Increase porosity simultaneously, sintering aid advantageously reduces the sintering temperature except wax material, further increases the efficiency of sintering processes.It is logical
Oversintering can assign ceramics certain mechanical property.
One embodiment according to the present utility model, the temperature of sintering processes can be 500-900 DEG C, preferably 600-700
DEG C, heating rate can be 1-5 DEG C/min, and preferably 3 DEG C/min, soaking time can be 0.5-2h, preferably 1-1.5h.Inventor
It was found that the temperature of sintering processes is excessively high, heating rate it is excessively high it is too low, soaking time is too long can all make ceramic burning so that more
Hole ceramics porosity reduces, and aperture is too small.And if the temperature of sintering processes is too low, soaking time is too short, then final gained ceramics
Sintering strength it is too low, the performance requirement of product is not achieved.In short, temperature, heating rate and soaking time can all directly affect
Intensity, hardness, porosity and the pore size of final ceramics.
Further embodiment according to the present utility model, by using the above-mentioned preparation process of the application, obtained diatom
The porosity of soil matrix porous ceramics reach 40-70%, intensity 5-20MPa, aperture be 5-20 μm, and porosity be up to 60% and
When above, intensity may remain in 10MPa or more, compared with existing preparation process, have significant progress.
According to the preparation method of the Diatomite-based Porous Ceramics of the utility model embodiment, by the way that diatomite and sintering are helped
Agent, pore creating material are mixed, and are conducive to improve the efficiency of subsequent mixing and the uniformity of mixing materials；By by mixed powder and stone
Wax, modifying agent are kneaded, and modifying agent can improve the wetability and mobility of diatomite and paraffin, can further improve mixed powder with
The melting efficiency and melting effect of paraffin；Mixing materials molding uses simple hot die-casting molding technique, can significantly reduce cost；At
Moulding mixture can be obtained in cavernous except wax material, which is handled except wax material is conducive to raising follow-up sintering after de-waxing is handled
Efficiency and effect；By that will be sintered except wax material, pore creating material volatilization therein, so that the pore size distribution of ceramic surface is more equal
It is even, while increasing porosity, sintering aid advantageously reduces the sintering temperature except wax material, further increases the effect of sintering processes
Rate.Using the technique can be obtained as a result, porosity is 5-20 μm for 40-70%, pore size and compression strength is 5-20MPa's
Diatomite-based Porous Ceramics have the characteristics that porosity is high, even pore distribution, and have enough intensity be able to satisfy petroleum,
The application requirement of the industry such as chemical industry, energy.
Below with reference to specific embodiment, the utility model is described, it should be noted that these embodiments are only
Descriptive, without limiting the utility model in any way.
Embodiment 1
By diatomite, low temperature and without heavy metal glass powder (granularity is 1500 mesh, melt temperature is 650-750 DEG C) and
Polystyrene microsphere (partial size is 20 μm), which is supplied according to 50wt%:10wt%:10wt% to ball mill, to be mixed, to be mixed
Powder；Paraffin and stearic acid are supplied according to 25wt%:5wt% to mixing in wax machine and mixed, be heated to it is paraffin melting, to obtain
Contain the mixture for melting paraffin；Mixed powder is supplied to the mixture mixed milling for mixing in wax machine and containing thawing paraffin,
To obtain mixing materials；Mixing materials are subjected to hot die-casting molding under 70 DEG C, the pressure of 3MPa, to obtain molding mass；It will be at
Moulding mixture supplies to wax expelling furnace and carries out de-waxing processing, and the temperature of de-waxing processing is 300 DEG C, the liter that de-waxing is handled at 200 DEG C or less
Warm rate is 0.5 DEG C/min, and the heating rate that de-waxing is handled at 200 DEG C or more is 1 DEG C/min, to obtain except wax material；It will
It is sintered except wax material is supplied to sintering furnace, the temperature of sintering processes is 900 DEG C, and heating rate is 5 DEG C/min, heat preservation
1h, to obtain Diatomite-based Porous Ceramics.Porosity, density and the intensity of resulting Diatomite-based Porous Ceramics such as 1 institute of table
Show.
Embodiment 2
By diatomite, low temperature and without heavy metal glass powder (granularity is 2000 mesh, melt temperature is 750-850 DEG C) and
Poly (methyl methacrylate) micro-sphere (partial size is 15 μm), which is supplied according to 55wt%:5wt%:10wt% to ball mill, to be mixed, so as to
Obtain mixed powder；Paraffin and stearic acid are supplied according to 27wt%:3wt% to mixing in wax machine and mixed, be heated to it is paraffin melting,
To obtain containing the mixture for melting paraffin；By mixed powder supply to mix in wax machine with containing melt paraffin mixture mix
It closes and is kneaded, to obtain mixing materials；Mixing materials are subjected to hot die-casting molding under 70 DEG C, the pressure of 3MPa, to be formed
Material；Molding mass is supplied to wax expelling furnace and carries out de-waxing processing, the temperature of de-waxing processing is 300 DEG C, at 200 DEG C or less at de-waxing
The heating rate of reason is 0.5 DEG C/min, and the heating rate that de-waxing is handled at 200 DEG C or more is 1 DEG C/min, to obtain paraffin removal
Material；It will be sintered except wax material is supplied to sintering furnace, the temperature of sintering processes is 900 DEG C, and heating rate is 5 DEG C/min,
1.5h is kept the temperature, to obtain Diatomite-based Porous Ceramics.Porosity, density and the intensity of resulting Diatomite-based Porous Ceramics are such as
Shown in table 1.
Embodiment 3
By diatomite, low temperature and without heavy metal glass powder (granularity is 3000 mesh, melt temperature is 650-750 DEG C) and
Polystyrene microsphere (partial size is 10 μm), which is supplied according to 57wt%:8wt%:5wt% to ball mill, to be mixed, to obtain mixed powder
Body；Paraffin and stearic acid are supplied according to 25wt%:5wt% to mixing in wax machine and mixed, be heated to it is paraffin melting, to be contained
There is the mixture for melting paraffin；Mixed powder is supplied to the mixture mixed milling for mixing in wax machine and containing thawing paraffin, with
Just mixing materials are obtained；Mixing materials are subjected to hot die-casting molding under 70 DEG C, the pressure of 3MPa, to obtain molding mass；It will molding
Material supply to wax expelling furnace carries out de-waxing processing, and the temperature of de-waxing processing is 300 DEG C, the heating that de-waxing is handled at 200 DEG C or less
Rate is 0.5 DEG C/min, and the heating rate that de-waxing is handled at 200 DEG C or more is 2 DEG C/min, to obtain except wax material；It will remove
Wax material is supplied to sintering furnace and is sintered, and the temperature of sintering processes is 900 DEG C, and heating rate is 5 DEG C/min, keeps the temperature 2h,
To obtain Diatomite-based Porous Ceramics.The porositys of resulting Diatomite-based Porous Ceramics, density and intensity are as shown in table 1.
Porosity, density and the intensity of Diatomite-based Porous Ceramics obtained by 1 embodiment 1-3 of table
| Porosity (%) | Density (g/cm3) | Intensity (MPa) | |
| Embodiment 1 | 62 | 1.10 | 11 |
| Embodiment 2 | 58 | 1.01 | 13 |
| Embodiment 3 | 54 | 1.08 | 18 |
Note:
Porosity is using the dedicated porosity test instrument test gained of porous ceramics；
Density is using drainage test gained；
Intensity is using omnipotent mechanics machine test gained.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combination and combination.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (5)
1. a kind of system for preparing Diatomite-based Porous Ceramics characterized by comprising
There is diatomite entrance, sintering aid entrance, pore creating material entrance and mixed powder to go out for mixing arrangement, the mixing arrangement
Mouthful；
Kneading device, the kneading device have paraffin entrance, modifier inlet, mixed powder entrance and mixing materials outlet, institute
Mixed powder entrance is stated to be connected with mixed powder outlet；
There is mixing materials entrance and molding mass to export for hot die-casting molding device, the hot die-casting molding device, and the mixing materials enter
Mouth is connected with mixing materials outlet；
De-waxing device, the de-waxing device have molding mass entrance and except wax material export, the molding mass entrance and the molding
Material outlet is connected；
Sintering equipment, the sintering equipment has except wax material entrance and Diatomite-based Porous Ceramics export, described to remove wax material entrance
With described except wax material outlet is connected.
2. system according to claim 1, which is characterized in that the kneading device is to mix wax machine or kneading machine.
3. system according to claim 1, which is characterized in that the hot die-casting molding device is hot injection moulding machine.
4. system according to claim 1, which is characterized in that the de-waxing device is wax expelling furnace.
5. system according to claim 1, which is characterized in that the sintering equipment is sintering furnace or tunnel kiln.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205104A (en) * | 2020-01-14 | 2020-05-29 | 东莞市陶陶新材料科技有限公司 | Porous ceramic for electronic cigarette and preparation method thereof |
| CN115594521A (en) * | 2022-10-19 | 2023-01-13 | 深圳市卓尔悦电子科技有限公司（Cn） | Porous ceramic and preparation method and application thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205104A (en) * | 2020-01-14 | 2020-05-29 | 东莞市陶陶新材料科技有限公司 | Porous ceramic for electronic cigarette and preparation method thereof |
| CN115594521A (en) * | 2022-10-19 | 2023-01-13 | 深圳市卓尔悦电子科技有限公司（Cn） | Porous ceramic and preparation method and application thereof |
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