CN113563058A - Atomizing core, porous ceramic and preparation method of porous ceramic - Google Patents
Atomizing core, porous ceramic and preparation method of porous ceramic Download PDFInfo
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- CN113563058A CN113563058A CN202110805314.9A CN202110805314A CN113563058A CN 113563058 A CN113563058 A CN 113563058A CN 202110805314 A CN202110805314 A CN 202110805314A CN 113563058 A CN113563058 A CN 113563058A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000002156 mixing Methods 0.000 claims abstract description 61
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 31
- 238000005245 sintering Methods 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims abstract description 15
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000005238 degreasing Methods 0.000 claims abstract description 6
- 239000001993 wax Substances 0.000 claims description 81
- 238000010438 heat treatment Methods 0.000 claims description 34
- 239000012188 paraffin wax Substances 0.000 claims description 30
- 235000013871 bee wax Nutrition 0.000 claims description 25
- 239000012166 beeswax Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 23
- 239000004698 Polyethylene Substances 0.000 claims description 19
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- 238000003756 stirring Methods 0.000 claims description 19
- 239000005909 Kieselgur Substances 0.000 claims description 12
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
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- 239000010949 copper Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 3
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- 239000011148 porous material Substances 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 8
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
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- 241000206761 Bacillariophyta Species 0.000 description 1
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Abstract
The invention discloses an atomizing core, porous ceramic and a preparation method of the porous ceramic. The preparation method of the porous ceramic comprises the following steps: mixing at least two kinds of diatomite with different particle sizes to form a raw material; mixing the raw materials, a sintering aid, a reinforcing agent and a pore-forming agent to form a mixture; mixing at least two binders to form a wax block; mixing the mixture and the wax block to form a ceramic material; preparing a blank by using a ceramic material through an injection molding process; and degreasing and sintering the green body to form the porous ceramic. By preparing the wax block and the mixture in advance, the powder materials can be mixed more uniformly, and the pore diameter of the prepared porous ceramic is uniform; through the particle size collocation of the diatomite, the gaps can be filled by utilizing the diatomite particles with smaller particle size, so that the porous ceramic has higher porosity and better aperture ratio; and the green body is prepared by adopting an injection molding mode, so that the preparation process is simple and convenient, the process flow is simple, and the mass production is easy.
Description
Technical Field
The invention relates to the technical field of atomization devices, in particular to an atomization core, porous ceramics and a preparation method of the porous ceramics.
Background
The porous ceramic material is widely used, has the characteristics of high porosity, good chemical stability, small volume and the like due to the specific three-dimensional porous structure, and is applied to various fields.
At present, when a porous ceramic material is prepared, diatomite is generally used as a main body, and a certain amount of binder and pore-forming agent are added for sintering and forming. However, the density of the green body formed by using the diatomite is low due to the inevitable gaps between adjacent diatomite particles, resulting in low porosity of the porous ceramic.
On the other hand, in the prior art, the blank is mostly manufactured by adopting a hot-press casting molding mode, and due to the fact that the particle size and the density of the diatomite are different greatly from those of the binder and the pore-forming agent, uniformity in the material molding process is poor, and efficient automatic production is not facilitated.
Disclosure of Invention
The invention provides an atomizing core, porous ceramic and a preparation method of the porous ceramic, and aims to solve the technical problems of low porosity and low manufacturing efficiency of the porous ceramic.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a method for preparing a porous ceramic, including:
mixing at least two kinds of diatomite with different particle sizes to form a raw material;
mixing the raw materials, the sintering aid, the reinforcing agent and the pore-forming agent to form a mixture;
mixing at least two binders to form a wax block;
mixing the mixed material and the wax block to form a ceramic material;
preparing a green body by using the ceramic material through an injection molding process; and
and carrying out degreasing and sintering treatment on the green body to form the porous ceramic.
Optionally, the step of mixing at least two diatomaceous earths of different particle size to form the feedstock comprises:
selecting at least two kinds of diatomite with different particle sizes, wherein the kinds of the diatomite comprise 300-mesh diatomite, 600-mesh diatomite, 900-mesh diatomite and 1200-mesh diatomite;
drying the at least two kinds of diatomite with different particle sizes;
and adding the at least two kinds of diatomite with different particle sizes into a ball mill according to a ratio, adding grinding balls with a mass ratio of 1:2, and carrying out ball milling for 1 hour to form the raw material.
Optionally, the step of adding the at least two diatomaceous earths of different particle size in proportion to a ball mill comprises:
according to the mass percentage, 0-40% of 300-mesh diatomite, 10-30% of 600-mesh diatomite, 10-50% of 900-mesh diatomite and 0-30% of 1200-mesh diatomite are added into the ball mill.
Optionally, the step of mixing the raw materials, the sintering aid, the reinforcing agent and the pore-forming agent to form a mixture comprises:
according to the mass percentage, 30-60% of the raw material, 5-30% of the sintering aid, 2-15% of the reinforcing agent and 15-35% of the pore-forming agent are added into a mixer;
mixing for 2-4 hours at the rotating speed of 80-120 r/min to form a mixture.
Optionally, the step of mixing at least two binders to form a wax block comprises:
weighing at least two of paraffin, beeswax and polyethylene according to a proportion, putting the weighed paraffin, beeswax and polyethylene into a paraffin mixer, and mixing for 3-5 hours at the temperature of 100-; and
the wax liquid was filtered using a copper screen and cooled to form a wax cake.
Optionally, the step of weighing at least two of paraffin, beeswax and polyethylene in proportion, placing the weighed paraffin, beeswax and polyethylene into a wax mixer, and mixing the weighed paraffin, beeswax and polyethylene at the temperature of 100-140 ℃ for 3-5 hours to form a wax liquid comprises:
setting the temperature of the wax mixing machine at 140 ℃ and the rotating speed at 25 revolutions per minute;
putting 50-70% of paraffin into a mixing cavity of the paraffin mixer according to the mass percentage;
after the paraffin is completely melted, adding 15-25% of the beeswax;
stopping stirring after the beeswax is completely melted, adding 2-9% of polyethylene, and sealing the mixing cavity for 0.5-1 hour; and
stirring and mixing are continued for 2-3 hours.
Optionally, the step of mixing the mixture and the wax block to form a ceramic material comprises:
according to the mass percentage, 25-45% of the wax blocks are put into an internal mixer at 100 ℃;
after the wax blocks are completely melted, setting the temperature of the internal mixer to be 90-130 ℃; and
adding the mixture for 5-10 times, and stirring and mixing for 15-20 hours.
Optionally, the step of performing degreasing and sintering treatment on the green body to form the porous ceramic comprises:
heating the blank to 140-180 ℃ at the speed of 6-30 ℃/h;
heating the blank to 320-350 ℃ at the speed of 20-50 ℃/h;
heating the blank to 450-500 ℃ at the speed of 40-90 ℃/h;
heating the blank to 580-620 ℃ at the speed of 80-160 ℃/h;
heating the blank to 800-900 ℃ at the temperature of 140-220 ℃/h;
heating the blank to 1000-1200 ℃ at the temperature of 150 ℃/h of 100-1200 ℃, and preserving the heat for 1-3 hours.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a porous ceramic prepared by the method for preparing a porous ceramic as described above.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided an atomizing core made from the porous ceramic described above.
The invention has the beneficial effects that: according to the invention, the wax block and the mixture are prepared in advance, so that the powder materials can be mixed more uniformly, and the pore diameter of the prepared porous ceramic is uniform; through the particle size collocation of the diatomite, the gaps can be filled by utilizing the diatomite particles with smaller particle size, so that the porous ceramic has higher porosity and better aperture ratio; and the green body is prepared by adopting an injection molding mode, so that the preparation process is simple and convenient, the process flow is simple, and the mass production is easy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a flow chart illustrating the preparation of a porous ceramic according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of step S12 in fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flow chart illustrating a process for preparing a porous ceramic according to an embodiment of the present disclosure. The application discloses a preparation method of porous ceramic, which comprises the following steps:
step S10: at least two diatomaceous earths of different particle size are mixed to form the feedstock.
The diatomite is the remains of ancient living diatoms, the main component of the diatomite is silicon dioxide, the particle shapes of the diatomite are complex and various, the dimension of the diatomite is micron-sized, the particle is of a light porous structure, and the nano-scale pore structure penetrates through the whole particle. Due to the characteristics of the materials and the structure, the diatomite has the advantages of large specific surface area, high porosity, high adsorbability, high slow release property, low density, high temperature resistance, corrosion resistance and the like. Considering the silicon dioxide component of the diatomite, the particles of the diatomite are bonded with each other under the action of hydrofluoric acid etching, and further can be solidified and molded into a complex, light and porous structure under the restraint of a mold, so that an effective way is provided for preparing the porous ceramic atomizing core with the bionic non-smooth surface morphology and the internal adsorption slow-release channel.
Specifically, the kind of diatomaceous earth used for selection may include 300 mesh diatomaceous earth, 600 mesh diatomaceous earth, 900 mesh diatomaceous earth, and 1200 mesh diatomaceous earth. The mesh number is the number of holes, which is the number of holes per inch. The larger the mesh size, the smaller the pore size. Generally, the mesh number × pore size (micrometer number) is 15000. For example, the pore size of 500 mesh diatomaceous earth is about 30 microns; the aperture of 600 mesh diatomite is about 25 microns; the pore size of the 900 mesh diatomaceous earth is about 17 microns. Through adopting the diatomaceous earth of two at least different particle sizes to carry out the granularity collocation, can utilize the diatomaceous earth granule of less particle size to fill the clearance, not only can obtain better aperture ratio, can obtain comparatively intensive granule moreover and pile up to obtain higher porosity.
Further, after the diatomaceous earth is sorted out, the diatomaceous earth may be subjected to a drying treatment to remove excess moisture. Then, according to the mass percentage, 0% -40% of 300-mesh diatomite, 10% -30% of 600-mesh diatomite, 10% -50% of 900-mesh diatomite and 0% -30% of 1200-mesh diatomite are added into a ball mill, then grinding balls with the mass ratio of 1:2 are added, the ball mill is used for 1 hour, and the mixture is collected for standby after the ball milling is finished, so that the forming raw material can be prepared.
After the diatomite is mixed and ball-milled to form the raw material, the step S11 may be continuously performed: mixing the raw materials, the sintering aid, the reinforcing agent and the pore-forming agent to form a mixture.
Wherein, the sintering aid comprises any one of kaolin and tourmaline, the reinforcing agent comprises any one of glass powder and vermiculite, and the pore-forming agent comprises one or two of wood dust, starch, calcium carbonate and graphite powder.
Specifically, the sintering aid, reinforcing agent, and pore-forming agent may be dried separately to remove excess water before mixing the raw materials. Then weighing 5-30% of a sintering aid, 2-15% of a reinforcing agent and 15-35% of a pore-forming agent according to the mass percentage, adding the materials into a mixer, and weighing 30-60% of the raw materials into the mixer; then mixing for 2-4 hours at the rotating speed of 80-120 r/min, and collecting for later use after the end, thus forming a mixture.
Further, as shown in fig. 1, after the mixture is obtained, the step S12 may be continuously performed: at least two binders are mixed to form a wax block.
Specifically, the adhesive may be selected from two or three of paraffin, beeswax and polyethylene. As shown in fig. 2, the step of mixing at least two binders to form a wax block includes:
step S121: at least two of paraffin, beeswax and polyethylene are weighed according to the proportion and put into a wax mixer, and are mixed for 3 to 5 hours at the temperature of 100 ℃ and 140 ℃ to form wax liquid.
Specifically, the temperature of the wax mixing machine can be set to be 100-140 ℃ and the rotating speed can be set to be 25 r/min; then 50-70% of paraffin is put into a mixing cavity of a paraffin mixer according to the mass percentage; after the paraffin is completely melted, 15 to 25 percent of beeswax is added; stopping stirring after the beeswax is completely melted, adding 2-9% of polyethylene, and sealing the mixing cavity for 0.5-1 hour; stirring and mixing are then continued for 2-3 hours. Thus, at least two binders can be mixed uniformly and fully.
After obtaining the uniformly mixed wax liquid, the step S122 may be continuously performed: the wax liquid was filtered using a copper screen and cooled to form a wax cake.
Specifically, after the wax liquid is obtained by sufficient mixing, the wax liquid may be filtered using a 100-mesh copper screen to remove impurities in the wax liquid, and then the filtered wax liquid may be cooled to form a large wax block.
Optionally, the cooling of the wax liquid may be performed by natural cooling, and of course, in order to improve the production efficiency, a cooling device may be used to cool the wax liquid.
Further, in order to facilitate the use of the wax block, the wax block can be cut after the wax block is cooled to form a small wax block, so that the melting time of the wax block can be reduced when the wax block is mixed with the raw materials, and the wax block with proper weight can be taken conveniently.
In the embodiment of the invention, the wax block and the mixture are prepared in advance, so that the powder materials can be mixed more uniformly.
After the mixture and the wax block are manufactured, the step S13 is continuously executed: and mixing the mixed material and the wax block to form the ceramic material.
Specifically, 25 to 45 percent of wax blocks can be put into an internal mixer at 100 ℃ according to the mass percentage; after the wax blocks are completely melted, setting the temperature of the internal mixer to be 90-130 ℃; adding the mixture for 5-10 times, and stirring and mixing for 15-20 hours.
Wherein, 25 to 45 percent of wax block and 55 to 75 percent of mixture can be weighed out, and then the mixture is divided into 5 to 10 parts. Firstly, putting all wax blocks into a 100 ℃ internal mixer, heating and melting the wax blocks, increasing and adjusting the temperature of the internal mixer to 90-130 ℃, then gradually adding the mixture while stirring and mixing, wherein the process can last for 15-20 hours, and thus, the mixture and the wax blocks can be completely and uniformly mixed.
After obtaining the mixed ceramic material, step S14 is then performed: and preparing a blank by using a ceramic material through an injection molding process.
Specifically, the ceramic material may be placed in an injection molding machine, the parameters of the machine set, and the green body prepared by an injection molding process.
After obtaining the green body, step S15 is then performed: and degreasing and sintering the green body to form the porous ceramic.
Specifically, the blank can be put into a heating furnace, and then the temperature is raised to 140-180 ℃ at the speed of 6-30 ℃/h; then the temperature is raised to 320-350 ℃ at the speed of 20-50 ℃/h; then heating to 450-500 ℃ at the speed of 40-90 ℃/h; then raising the temperature to 580-620 ℃ at the speed of 80-160 ℃/h; then the temperature is raised to 800-900 ℃ at the speed of 140-220 ℃/h; then raising the temperature to 1000-1200 ℃ at the temperature of 150 ℃/h of 100-1200 ℃ and preserving the temperature for 1-3 hours to obtain the porous ceramic. According to the embodiment of the invention, the stability of the porous ceramic can be improved through variable-stage heating sintering.
It is understood that, in other embodiments, the step S12 may be performed to prepare the wax block, and then the steps S10 and S11 may be performed to form the mixture. Alternatively, step S12, step S10 and step S11 may be performed simultaneously, and in this case, the wax block and the mixture may be obtained simultaneously, so as to improve the production efficiency of the porous ceramic.
The preparation method of the porous ceramic at least has the following advantages:
1) by preparing the wax block and the mixture in advance, the powder materials can be mixed more uniformly, and the pore diameter of the prepared porous ceramic is uniform;
2) through the particle size collocation of the diatomite, the gaps can be filled by utilizing the diatomite particles with smaller particle size, so that the porous ceramic has higher porosity and better aperture ratio;
3) the green body is prepared by adopting an injection molding mode, so that the preparation process is simple and convenient, the process flow is simple, and the mass production is easy;
4) the porous ceramic has good stability by sintering the green body through variable-stage temperature rise.
The application also provides a porous ceramic which can be prepared by adopting the preparation method of the porous ceramic.
In yet another aspect, the present application further provides an atomizing core made of the porous ceramic. The atomizing core may be provided in an atomizing device for atomizing a liquid.
The following are specific examples:
example 1:
the preparation method of the porous ceramic of the embodiment is as follows:
(1) according to the mass percentage, 70 percent of paraffin, 23 percent of beeswax and 7 percent of polyethylene are weighed. Setting the temperature of the wax mixer at 120 ℃, rotating at 25 r/min, firstly adding paraffin, adding beeswax after the paraffin is completely melted, stopping stirring after the beeswax is completely melted, adding polyethylene, sealing the mixing cavity for 1 hour, and then continuing stirring for 3 hours. And after the mixing is finished, filtering the wax liquid by using a 100-mesh copper screen, and cutting the wax liquid into small wax blocks for later use after the wax liquid is cooled.
(2) According to the mass percentage, 50% of 300-mesh diatomite, 20% of 600-mesh diatomite and 30% of 900-mesh diatomite are weighed and put into a ball mill, and the weight ratio of the materials is 1:2, ball milling for 1 hour, and collecting for later use after the ball milling is finished.
(3) Weighing 50% of mixed diatomite, 5% of kaolin, 13% of glass powder, 2% of calcium carbonate and 30% of 300-mesh sawdust by mass percentage, adding the mixture into a mixer, mixing for 4 hours at the rotating speed of 100 revolutions per minute, and collecting the mixture for later use.
(4) Weighing 70% of mixture and 30% of wax blocks by mass percent, putting the wax blocks into a 120 ℃ internal mixer, and setting the temperature to be 90 ℃ after the wax blocks are completely melted. The batch was added 8 more times and stirring was continued for 18 hours. After the mixing is completed, granulation is performed and collected for later use.
(5) And (3) putting the ceramic granulated material into an injection molding machine, setting parameters of the machine, and preparing a blank by an injection molding process.
(6) And carrying out step-changing temperature-rising sintering on the ceramic blank. Heating to 150 ℃ at a speed of 20 ℃/h, heating to 330 ℃ at a speed of 30 ℃/h, heating to 500 ℃ at a speed of 50 ℃/h, heating to 600 ℃ at a speed of 65 ℃/h, heating to 900 ℃ at a speed of 150 ℃/h, heating to 1160 ℃ at a speed of 100 ℃/h, and keeping the temperature for 1 hour to obtain the porous ceramic.
Example 2:
the preparation method of the porous ceramic of the embodiment is as follows:
(1) according to the mass percentage, 72 percent of paraffin, 25 percent of beeswax and 3 percent of polyethylene are weighed. Setting the temperature of the wax mixer at 110 ℃, rotating at 25 r/min, firstly adding paraffin, adding beeswax after the paraffin is completely melted, stopping stirring after the beeswax is completely melted, adding polyethylene, sealing the mixing cavity for 1 hour, and then continuing stirring for 3 hours. And after the mixing is finished, filtering the wax liquid by using a 100-mesh copper screen, and cutting the wax liquid into small wax blocks for later use after the wax liquid is cooled.
(2) Weighing 15% of 300-mesh diatomite, 23% of 600-mesh diatomite, 50% of 900-mesh diatomite and 12% of 1200-mesh diatomite according to mass percentage, putting the materials into a ball mill, and adding the materials in a mass ratio of 1:2, ball milling for 1 hour, and collecting for later use after the ball milling is finished.
(3) Weighing 45% of mixed diatomite, 3% of kaolin, 3% of tourmaline, 17% of glass powder, 17% of starch and 15% of 300-mesh sawdust by mass percentage, adding the mixture into a mixer, mixing for 4 hours at the rotating speed of 100 revolutions per minute, and collecting the mixture for later use after the mixing is finished.
(4) Weighing 66% of mixture and 34% of wax blocks by mass percent, putting the wax blocks into a 120 ℃ internal mixer, and setting the temperature to be 90 ℃ after the wax blocks are completely melted. The batch was added 8 more times and stirring was continued for 16 hours. After the mixing is completed, granulation is performed and collected for later use.
(5) And (3) putting the ceramic granulated material into an injection molding machine, setting parameters of the machine, and preparing a blank by an injection molding process.
(6) And carrying out step-changing temperature-rising sintering on the ceramic blank. Heating to 140 ℃ at a speed of 10 ℃/h, then heating to 350 ℃ at a speed of 20 ℃/h, then heating to 500 ℃ at a speed of 40 ℃/h, then heating to 600 ℃ at a speed of 80 ℃/h, then heating to 900 ℃ at a speed of 150 ℃/h, then heating to 1165 ℃ at a speed of 100 ℃/h, and preserving heat for 1 hour to obtain the porous ceramic.
Example 3:
the preparation method of the porous ceramic of the embodiment is as follows:
(1) according to the mass percentage, 71 percent of paraffin, 20 percent of beeswax and 9 percent of polyethylene are weighed. Setting the temperature of the wax mixer at 130 ℃, rotating at 25 r/min, firstly adding paraffin, adding beeswax after the paraffin is completely melted, stopping stirring after the beeswax is completely melted, adding polyethylene, sealing the mixing cavity for 1 hour, and then continuing stirring for 3 hours. And after the mixing is finished, filtering the wax liquid by using a 100-mesh copper screen, and cutting the wax liquid into small wax blocks for later use after the wax liquid is cooled.
(2) According to the mass percentage, 43 percent of 300-mesh diatomite, 36 percent of 600-mesh diatomite and 21 percent of 900-mesh diatomite are weighed and put into a ball mill, and the weight ratio of the materials is 1:2, ball milling for 1 hour, and collecting for later use after the ball milling is finished.
(3) Weighing 40% of mixed diatomite, 8% of tourmaline, 6% of glass powder, 11% of vermiculite, 5% of calcium carbonate and 30% of starch in percentage by mass, adding the materials into a mixer, mixing for 4 hours at the rotating speed of 100 revolutions per minute, and collecting the materials for later use after the materials are mixed.
(4) According to the mass percentage, 73 percent of mixture and 27 percent of wax blocks are weighed, the wax blocks are firstly put into a 120 ℃ internal mixer, and the temperature is set to be 100 ℃ after the wax blocks are completely melted. The mixture was added 8 more times and stirring was continued for 20 hours. After the mixing is completed, granulation is performed and collected for later use.
(5) And (3) putting the ceramic granulated material into an injection molding machine, setting parameters of the machine, and preparing a blank by an injection molding process.
(6) And carrying out step-changing temperature-rising sintering on the ceramic blank. Heating to 150 ℃ at a speed of 25 ℃/h, heating to 340 ℃ at a speed of 40 ℃/h, heating to 500 ℃ at a speed of 50 ℃/h, heating to 600 ℃ at a speed of 70 ℃/h, heating to 900 ℃ at a speed of 150 ℃/h, heating to 1150 ℃ at a speed of 100 ℃/h, and keeping the temperature for 1 hour to obtain the porous ceramic.
In order to verify the properties of the porous ceramics prepared in the above examples, the porous ceramics were tested and the results are as follows:
| porosity% | Pore diameter um | Strength MPa | |
| Example 1 | 62 | 22 | 7.3 |
| Example 2 | 67 | 26 | 6.2 |
| Example 3 | 59 | 20 | 8.5 |
Therefore, the detection results of the porosity, the pore diameter and the strength show that the porosity of the porous ceramic prepared by the embodiment of the invention can basically reach more than 55%; moreover, the pore diameter of the porous ceramic can basically reach 20 microns. In addition, the strength of the porous ceramic prepared by the embodiment of the invention is more than 6MPa, so that the porous ceramic has higher structural strength.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for preparing a porous ceramic, comprising:
mixing at least two kinds of diatomite with different particle sizes to form a raw material;
mixing the raw materials, the sintering aid, the reinforcing agent and the pore-forming agent to form a mixture;
mixing at least two binders to form a wax block;
mixing the mixed material and the wax block to form a ceramic material;
preparing a green body by using the ceramic material through an injection molding process; and
and carrying out degreasing and sintering treatment on the green body to form the porous ceramic.
2. The method of claim 1, wherein the step of mixing at least two diatomaceous earths of different particle sizes to form a raw material comprises:
selecting at least two kinds of diatomite with different particle sizes, wherein the kinds of the diatomite comprise 300-mesh diatomite, 600-mesh diatomite, 900-mesh diatomite and 1200-mesh diatomite;
drying the at least two kinds of diatomite with different particle sizes;
and adding the at least two kinds of diatomite with different particle sizes into a ball mill according to a ratio, adding grinding balls with a mass ratio of 1:2, and carrying out ball milling for 1 hour to form the raw material.
3. The method for preparing porous ceramic according to claim 2, wherein the step of adding the at least two kinds of diatomaceous earth having different particle sizes in proportion to the ball mill comprises:
according to the mass percentage, 0-40% of 300-mesh diatomite, 10-30% of 600-mesh diatomite, 10-50% of 900-mesh diatomite and 0-30% of 1200-mesh diatomite are added into the ball mill.
4. The method of claim 1, wherein the step of mixing the raw materials, the sintering aid, the reinforcing agent, and the pore-forming agent to form a mixture comprises:
according to the mass percentage, 30-60% of the raw material, 5-30% of the sintering aid, 2-15% of the reinforcing agent and 15-35% of the pore-forming agent are added into a mixer;
mixing for 2-4 hours at the rotating speed of 80-120 r/min to form a mixture.
5. The method of preparing a porous ceramic according to claim 1, wherein the step of mixing at least two binders to form a wax block comprises:
weighing at least two of paraffin, beeswax and polyethylene according to a proportion, putting the weighed paraffin, beeswax and polyethylene into a paraffin mixer, and mixing for 3-5 hours at the temperature of 100-; and
the wax liquid was filtered using a copper screen and cooled to form a wax cake.
6. The method for preparing porous ceramic according to claim 5, wherein the step of weighing at least two of paraffin wax, beeswax and polyethylene in proportion, placing into a wax mixer, and mixing at 100-140 ℃ for 3-5 hours to form a wax liquid comprises:
setting the temperature of the wax mixing machine at 140 ℃ and the rotating speed at 25 revolutions per minute;
putting 50-70% of paraffin into a mixing cavity of the paraffin mixer according to the mass percentage;
after the paraffin is completely melted, adding 15-25% of the beeswax;
stopping stirring after the beeswax is completely melted, adding 2-9% of polyethylene, and sealing the mixing cavity for 0.5-1 hour; and
stirring and mixing are continued for 2-3 hours.
7. The method of claim 1, wherein the step of mixing the mixture and the wax block to form a ceramic mass comprises:
according to the mass percentage, 25-45% of the wax blocks are put into an internal mixer at 100 ℃;
after the wax blocks are completely melted, setting the temperature of the internal mixer to be 90-130 ℃; and
adding the mixture for 5-10 times, and stirring and mixing for 15-20 hours.
8. The method of claim 1, wherein the step of degreasing and sintering the green body to form the porous ceramic comprises:
heating the blank to 140-180 ℃ at the speed of 6-30 ℃/h;
heating the blank to 320-350 ℃ at the speed of 20-50 ℃/h;
heating the blank to 450-500 ℃ at the speed of 40-90 ℃/h;
heating the blank to 580-620 ℃ at the speed of 80-160 ℃/h;
heating the blank to 800-900 ℃ at the temperature of 140-220 ℃/h;
heating the blank to 1000-1200 ℃ at the temperature of 150 ℃/h of 100-1200 ℃, and preserving the heat for 1-3 hours.
9. A porous ceramic produced by the method for producing a porous ceramic according to any one of claims 1 to 9.
10. An atomizing core, characterized in that the atomizing core is made of the porous ceramic of claim 9.
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| CN114557364A (en) * | 2022-02-21 | 2022-05-31 | 广西环保产业发展研究院有限公司 | Chlorine dioxide slow-release air freshener |
| WO2023284424A1 (en) * | 2021-07-16 | 2023-01-19 | 深圳市吉迩科技有限公司 | Atomizing core, porous ceramic, and method for preparing porous ceramic |
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Application publication date: 20211029 |