A novel ceramic aroma diffuser stone and its preparation method

Abstract

The application discloses a novel ceramic fragrance diffusing stone and a preparation method thereof. The novel ceramic fragrance diffusing stone is prepared from the following raw materials in mass: 27.5-33.3% of kaolin, 20.6-24.5% of alumina, 39.2-49.0% of cordierite clinker, 1-3% of bentonite, 0-4% of high-boron-silicon glass powder and 0-3% of colorant. The novel ceramic fragrance diffusing stone has a water absorption of 9-20% and an average pore size of 0.5-2 mu m. The novel ceramic fragrance diffusing stone can be artificially manufactured, has good fragrance diffusing effect and strong durability, has low production cost, can be manufactured into various shapes and in various colors, and is convenient to clean.

Description

Technical Field

[0001] This invention relates to the field of diffuser stone technology, and in particular to a novel ceramic diffuser stone and its preparation method. Background Technology

[0002] Aroma stones are fragrance stones made from various raw materials such as natural minerals and wood particles with nanoscale porous structures, typically made of gypsum. Aroma stones absorb moisture through their surface pores, regulating internal and external humidity to achieve a diffused fragrance effect. When the humidity inside the aroma stone is higher than that of the air, it releases moisture into the air, achieving a diffused fragrance effect; when the humidity inside the aroma stone is lower than that of the air, it absorbs moisture from the air, resulting in a less noticeable diffused fragrance effect. In this case, spraying a little water on the surface will achieve the desired effect. After the fragrance dissipates, add a few drops of essential oil for repeated use; it's environmentally friendly, practical, and aesthetically pleasing.

[0003] Currently, aroma diffusers made from natural minerals work by allowing liquid to seep into their surface through small pores, and then releasing the fragrance through the pores within the stone itself. However, the high cost and difficulty in processing these minerals result in high market prices and a limited product range, hindering their large-scale promotion and application.

[0004] The most common artificial diffuser stones on the market are usually gypsum products. Gypsum has strong adsorption properties and can absorb a lot of essential oils at once. In addition, gypsum products are easy to mold and can be made into various shapes. However, gypsum diffusers have poor durability, and the surface is prone to mold after absorbing water. They are also difficult to clean after being contaminated. In addition, the color is relatively limited and they are easy to break. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a novel ceramic diffuser stone and its preparation method. This novel ceramic diffuser stone can be artificially manufactured, has a good diffuser effect and long-lasting effect, and has a low production cost. It can be made into various shapes and colors, and is easy to clean.

[0006] To solve the above technical problems, the following technical solution is adopted:

[0007] A novel ceramic aroma diffuser stone is characterized by: an average pore size of 0.5-2μm, open pores formed by particle accumulation, narrow channels connecting the pores, and a water absorption rate of 9-20%.

[0008] In a preferred embodiment, the novel ceramic aroma diffuser stone is made from the following raw materials by weight: 27.5-33.3% kaolin, 20.6-24.5% alumina, 39.2-49.0% cordierite clinker, 1-3% bentonite, 0-4% high borosilicate glass powder, and 0-3% colorant.

[0009] In the preferred embodiment, the raw material contains the following components, with the following mass ratios: K2O + Na2O < 1.0%, Fe2O3 < 2%, MgO < 3%, CaO < 2%, and the total mass of each component does not exceed 4%. K2O and Na2O are alkali metal oxides, while MgO and CaO are alkaline earth metal oxides. These components will generate a liquid phase at high temperatures, promoting sintering and improving product strength. However, they also easily form closed pores in the ceramic structure, and excessive content is detrimental to improving the adsorption performance of the ceramic diffuser stone. The Fe2O3 content will affect the color development of the ceramic diffuser stone.

[0010] In the preferred embodiment, the particle size of the cordierite clinker is 20-45 μm, the particle size of the kaolin is 1-5 μm, and the particle size of other raw materials is no greater than 45 μm.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The performance comparison between the ceramic diffuser stone of the present invention and the existing gypsum diffuser stone is as follows:

[0013] Product Category Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffusion perfume concentration / mg / m 3 <!-- 1 -->]]> Ceramic diffuser stone 9-20 35-70 10-20 1.2-2.1 Gypsum diffuser 18-22 4-8 18-22 1.-1.5

[0014] The ceramic diffuser stone of the present invention has excellent diffuser effect, higher strength, is easy to manufacture and has low production cost. It can be made into various shapes and colors, and is easy to clean.

[0015] 2. The ceramic aroma diffuser stone of the present invention underwent performance testing and comparison at different average pore sizes. The testing methods included:

[0016] (1) Average pore size: The test was conducted using a mercury porosimeter and the microstructure was observed using a scanning electron microscope;

[0017] (2) Water absorption rate: tested using the Archimedes method;

[0018] (3) Flexural strength: tested using the three-point flexural method;

[0019] (4) Perfume duration: A sample with a diameter of 50 mm and a thickness of 5 mm was placed in a 50*50 cm sealed iron box. The perfume concentration was measured using a handheld air purifier until the perfume concentration was <0.5 mg / m³. 3 Calculate the total number of days up to this point; Experimental conditions: temperature 20℃, air humidity 50%;

[0020] (5) Perfume concentration: Place a sample with a diameter of 50 mm and a thickness of 5 mm in a 50*50 cm sealed iron box for 10 min, and use a handheld gas detector for fragrance environment to measure the perfume concentration; Experimental conditions: temperature 20℃, air humidity 50%.

[0021] The test results are as follows:

[0022] Average pore size / μm Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffused perfume concentration / mg / m 3 > 0.3 7 80 25 0.7 0.5 9 70 20 1.2 1.0 13 56 18 1.5 1.5 18 47 13 1.9 2.0 20 35 10 2.1 3.0 28 18 6 3.0

[0023] The ceramic diffuser stone of this invention exhibits moderate water absorption and optimal overall performance when the average pore size is 0.5-2 μm, demonstrating a balanced performance in flexural strength, fragrance duration, and perfume concentration. While a higher flexural strength and longer fragrance duration are achieved when the average pore size is less than 0.5 μm, the diffuser's perfume concentration is lower. When the average pore size is greater than 2.0 μm, the flexural strength of the sample decreases, and the fragrance duration is reduced.

[0024] 3. When the ceramic aroma diffuser stone of the present invention is prepared using the above-mentioned raw materials, mullite is generated by reacting kaolin with alumina, which has excellent molding properties. Taking advantage of the characteristic that cordierite clinker is difficult to sinter and densify, cordierite clinker provides aggregate. At the same time, cordierite clinker can also regulate firing shrinkage, reduce firing shrinkage, prevent excessive shrinkage from causing cracking, and make particles accumulate to prepare ceramic aroma diffuser stone with controllable average pore size. Bentonite can adjust the plasticity of the clay, which is conducive to molding. High borosilicate glass powder can reduce water absorption and reduce pore size while improving overall strength. Colorants are used to adjust the color of ceramic aroma diffuser stone.

[0025] This invention also provides a method for preparing the novel ceramic diffuser stone, characterized by comprising the following steps:

[0026] (1) By weight, the following raw materials are provided: 27.5-33.3% kaolin, 20.6-24.5% alumina, 39.2-49.0% cordierite clinker, 1-3% bentonite, 0-4% high borosilicate glass powder, and 0-3% colorant;

[0027] (2) After crushing the raw materials prepared in step (1), add an appropriate amount of water and mix evenly to form a ceramic slurry;

[0028] (3) Cast the ceramic slurry obtained in step (2) into a blank;

[0029] (4) The green body obtained in step (3) is sintered at high temperature. At high temperature, the green body is based on cordierite clinker as the skeleton, and other raw materials are in liquid phase. The flow of liquid phase is controlled by temperature regulation and the gaps between cordierite clinker are filled and connected to adjust the water absorption rate and average pore size. Finally, it is fired into ceramic aroma diffuser stone.

[0030] In the preferred embodiment, in step (2), the raw materials are pulverized using a wet ball mill. After pulverization and mixing, the raw materials can be mixed with water to form a ceramic slurry.

[0031] In the preferred embodiment, in step (3), the ceramic slurry is formed into a blank by high-pressure grouting. The ceramic slurry is injected into a high-pressure grouting machine, and the slurry is injected into the mold under high pressure.

[0032] In a further preferred embodiment, when the mixed powder is subjected to high-pressure grouting molding, the grouting pressure is maintained at 0.2-0.3 MPa, and the process lasts for 10-30 seconds.

[0033] In the preferred embodiment, the temperature adjustment in step (4) includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000 ~ 1200℃, heating rate is 3℃ / min; step (4-3) 1200 ~ firing temperature, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h; wherein the firing temperature range is 1280 ~ 1420 ℃.

[0034] In the preferred embodiment, the embryo is fired in a tunnel kiln in step (4).

[0035] The beneficial effects of this invention are as follows:

[0036] 1. The ceramic diffuser stone of this invention exhibits excellent diffuser performance when the water absorption rate is 9%-20%, the average pore size is 0.5-2 μm, and the pore morphology is open pores. The diffuser capacity can reach or even exceed the level of existing gypsum diffuser stones. It will not mold after absorbing water. At the same time, its physical properties (strength, durability) are far superior to those of gypsum products (flexural strength > 35 MPa), and the production cost of the product is lower than that of gypsum diffuser stones.

[0037] 2. In the manufacturing process of the ceramic aroma diffuser stone of the present invention, by taking advantage of the characteristic that cordierite clinker is difficult to sinter and densify, and using kaolin raw material with excellent forming performance, as well as cordierite clinker, ceramic aroma diffuser stone products with controllable average pore size can be successfully prepared through particle stacking, high-temperature sintering, high-temperature reaction, liquid phase filling (i.e., liquid phase sintering, the liquid phase formed at high temperature will flow, which can play the role of filling pores and binding particles). Attached Figure Description

[0038] Figure 1 This is a scanning electron microscope image of the interior of the ceramic aroma diffuser stone in this invention. Detailed Implementation

[0039] Example 1

[0040] In this embodiment, the preparation method of the ceramic diffuser stone includes the following steps:

[0041] (1) The following raw materials are prepared according to the mass ratio: 34 parts kaolin, 25 parts alumina, 40 parts cordierite clinker, 1 part bentonite, and 2 parts high borosilicate glass powder; wherein, the total mass of K2O, Na2O, Fe2O3, MgO, and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0042] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0043] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0044] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000~1200℃, heating rate is 3℃ / min; step (4-3) 1200~1320℃, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h.

[0045] Example 2

[0046] In this embodiment, the preparation method of the ceramic diffuser stone includes the following steps:

[0047] (1) The following raw materials are prepared according to the mass ratio: 31 parts kaolin, 23 parts alumina, 45 parts cordierite clinker, 1 part bentonite, and 2 parts high borosilicate glass powder; wherein, the total mass of K2O, Na2O, Fe2O3, MgO, and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0048] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0049] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0050] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000~1200℃, heating rate is 3℃ / min; step (4-3) 1200~1320℃, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h.

[0051] Example 3

[0052] In this embodiment, the preparation method of the ceramic diffuser stone includes the following steps:

[0053] (1) The following raw materials are prepared according to the mass ratio: 28 parts kaolin, 21 parts alumina, 50 parts cordierite clinker, 1 part bentonite, and 2 parts high borosilicate glass powder; wherein, the total mass of K2O, Na2O, Fe2O3, MgO, and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0054] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0055] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0056] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000~1200℃, heating rate is 3℃ / min; step (4-3) 1200~1320℃, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h.

[0057] Comparative Example 1

[0058] In this comparative example, the preparation method of the ceramic diffuser stone includes the following steps:

[0059] (1) The following raw materials are prepared according to the mass ratio: 37 parts kaolin, 27 parts alumina, 35 parts cordierite clinker, 1 part bentonite, and 2 parts high borosilicate glass powder; wherein, the total mass of K2O, Na2O, Fe2O3, MgO, and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0060] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0061] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0062] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000~1200℃, heating rate is 3℃ / min; step (4-3) 1200~1320℃, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h.

[0063] Comparative Example 2

[0064] In this comparative example, the preparation method of the ceramic diffuser stone includes the following steps:

[0065] (1) The following raw materials are prepared according to the mass ratio: 25 parts kaolin, 19 parts alumina, 55 parts cordierite clinker, 1 part bentonite, and 2 parts high borosilicate glass powder; wherein, the total mass of K2O, Na2O, Fe2O3, MgO and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0066] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0067] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0068] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; step (4-2) 1000~1200℃, heating rate is 3℃ / min; step (4-3) 1200~1320℃, heating rate is 1.5℃ / min; step (4-4) holding time is 2 h.

[0069] Experimental Example 1

[0070] The ceramic diffuser stones prepared in Examples 1-3 and Comparative Examples 1-2 of this invention were subjected to performance tests for comparison. The test methods included:

[0071] (1) Average pore size: The test was conducted using a mercury porosimeter and the microstructure was observed using a scanning electron microscope;

[0072] (2) Water absorption rate: tested using the Archimedes method;

[0073] (3) Flexural strength: tested using the three-point flexural method;

[0074] (4) Perfume duration: A sample with a diameter of 50 mm and a thickness of 5 mm was placed in a 50*50 cm sealed iron box. The perfume concentration was measured using a handheld air purifier until the perfume concentration was <0.5 mg / m³. 3 Calculate the total number of days up to this point; Experimental conditions: temperature 20℃, air humidity 50%;

[0075] (5) Perfume concentration: Place a sample with a diameter of 50 mm and a thickness of 5 mm in a 50*50 cm sealed iron box for 10 min, and use a handheld gas detector for fragrance environment to measure the perfume concentration; Experimental conditions: temperature 20℃, air humidity 50%.

[0076] The test results are as follows:

[0077] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Average pore size / μm 0.95 1.0 1.5 0.9 2.2 Water absorption rate / % 10 13 18 7 25 Flexural strength / MPa 60 56 47 62 35 Fragrance duration (days) 15 18 13 6 8 <![CDATA[Diffused perfume concentration / mg / m 3 > 1.3 1.5 1.9 0.9 2.5

[0078] The test results above show that different formulations affect pore size and diffusion performance. If the average pore size is too small and the water absorption rate is too low, the ceramic diffuser stone will not be able to absorb and release the perfume, resulting in a short perfume duration and low diffused perfume concentration. If the average pore size is too large and the water absorption rate is too high, the perfume will be difficult to retain in the ceramic diffuser stone for a long time, resulting in a short perfume duration and excessively high diffused perfume concentration.

[0079] In various formulations, the particle accumulation of cordierite clinker is the primary means of forming pores; the particle accumulation of cordierite clinker can form open pores (such as...). Figure 1 (As shown). When the content of cordierite clinker is too low (such as in Comparative Example 1), the system will undergo an in-situ reaction to synthesize cordierite clinker and other phases, generating narrow and elongated closed pores, which leads to a reduction in open pores, a decrease in water absorption, and a poorer aroma diffusion effect.

[0080] When the cordierite clinker content is too high and the binder and filler materials are reduced (as in Comparative Example 2), the glass phase decreases, the system density is poor, resulting in increased water absorption, larger pore size, and poorer aroma diffusion. In addition, when there is too much cordierite clinker and a decrease in plastic raw materials such as kaolin, it will also lead to difficulties in product molding.

[0081] Experiment Example 2

[0082] Without changing the other steps in Example 2, the total mass percentage of K2O, Na2O, Fe2O3, MgO, and CaO was increased to 6%, and the performance of the ceramic diffuser stone prepared in this way and the ceramic diffuser stone prepared in Example 2 were compared. The test results are as follows:

[0083] <![CDATA[Percentage of the total mass of K2O, Na2O, Fe2O3, MgO, and CaO / %]]> Average pore size / μm Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffused perfume concentration / mg / m 3 > 2 1.0 13 56 18 1.5 6 0.7 8 60 6 2.1

[0084] The test results above show that, under the same formulation and procedures, an excessively high total mass of K₂O, Na₂O, Fe₂O₃, MgO, and CaO results in a smaller average pore size, lower water absorption rate, shorter fragrance duration, and an excessively high fragrance concentration. This is because an excessively high total mass of K₂O, Na₂O, Fe₂O₃, MgO, and CaO leads to the formation of a large amount of liquid phase in the system, causing the system to generate narrow, closed pores. This reduces the number of open pores, lowers the water absorption rate, and worsens the fragrance diffusion effect.

[0085] Experimental Example 3

[0086] Without changing the other steps in Example 2, the particle size of the cordierite clinker was changed to 5-25 μm and 35-60 μm, respectively. Performance tests were conducted on the ceramic diffuser stones prepared in these two ways and the ceramic diffuser stone prepared in Example 2. The test results are as follows:

[0087] Particle size of cordierite clinker / μm Average pore size / μm Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffused perfume concentration / mg / m 3 > 5-25 0.3 7 80 25 0.7 20-45 1.0 13 56 18 1.5 35-60 2.3 26 33 8 2.5

[0088] The test results above show that if the particle size of cordierite clinker is too small, the average pore size will be too small and the water absorption rate will be too low, resulting in a low concentration of diffused perfume. Conversely, if the particle size of cordierite clinker is too large, the average pore size will be too large and the water absorption rate will be too high, resulting in a short perfume duration and an excessively high concentration of diffused perfume. This is because smaller particle sizes of cordierite clinker result in smaller pores due to particle accumulation, while larger particle sizes result in larger pores due to particle accumulation.

[0089] Experiment Example 4

[0090] Without changing the other steps in Example 2, the ceramic slurry obtained in step (3) was formed into a blank by atmospheric pressure grouting, plastic molding, and dry pressing, respectively. The performance of the ceramic aroma diffuser stones made by these three methods and the ceramic aroma diffuser stones made in Example 2 were compared and tested. The test results are as follows:

[0091] Molding method Average pore size / μm Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffusion perfume concentration / mg / m 3 > High-pressure grouting molding 1.0 13 56 18 1.5 Atmospheric pressure grouting 1.3 15 40 9 2.2 Plastic molding 1.1 13.5 50 7 2.3 Dry pressing 1.2 14 51 7 2.5

[0092] The test results above show that although the average pore size, water absorption rate, and flexural strength of ceramic diffuser stones made by high-pressure injection molding, atmospheric pressure injection molding, plastic molding, and dry pressing are not significantly different, the fragrance duration of ceramic diffuser stones made by atmospheric pressure injection molding, plastic molding, and dry pressing is significantly shorter and the fragrance concentration is excessively high compared to high-pressure injection molding. The main reason for this phenomenon is that plastic molding and dry pressing, due to their low water content, make it difficult to evenly disperse the particles, resulting in large, interconnected pores with wide channels that make it difficult to fix the fragrance in the sample, leading to excessively rapid diffusion. While atmospheric pressure injection molding can, to some extent, evenly disperse and accumulate the particles, reducing the gaps between the pores, the gaps are still relatively large, making it difficult to fix the fragrance. High-pressure injection molding, on the other hand, can further reduce the gaps between the pores, thus helping to fix the fragrance in the sample and achieve a continuous and stable diffusion function. It also helps to densify the sample and improve the product's flexural strength.

[0093] Experimental Example 5

[0094] In this experimental example, the preparation method of the ceramic aroma diffuser stone includes the following steps:

[0095] (1) The following raw materials are prepared according to the mass ratio: 34 parts kaolin, 20 parts alumina, 45 parts cordierite clinker, and 1 part bentonite; wherein, the total mass of K2O, Na2O, Fe2O3, MgO, and CaO in the raw materials shall account for 2%; and the particle size of cordierite clinker shall be 20-45 μm;

[0096] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0097] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0098] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: Step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; Step (4-2) 1000 ~ 1200℃, heating rate is 3℃ / min; Step (4-3) 1200 ~ firing temperature, heating rate is 1.5℃ / min; Step (4-4) holding time is 2 h.

[0099] Without changing the other steps mentioned above, the firing temperatures in step (4-3) were adjusted to 1280℃, 1300℃, 1320℃, 1340℃, 1360℃, 1380℃, 1400℃, and 1420℃, respectively. Performance tests were then conducted on the ceramic aroma diffusers produced using these methods, and the results are as follows:

[0100] Firing temperature / °C Average pore size / μm Water absorption rate / % Flexural strength / MPa Fragrance duration (days) <![CDATA[Diffused perfume concentration / mg / m 3 > 1280 2.13 21.12 32.5 10 2.20 1300 2.02 20.15 34.6 10 2.08 1320 1.89 19.12 36.2 10 1.98 1340 1.62 18.58 42.3 12 1.92 1360 1.46 17.70 48.0 13 1.78 1380 1.40 17.15 49.4 13 1.70 1400 1.38 16.76 52.3 15 1.67 1420 1.39 16.93 51.2 15 1.68

[0101] The test results above show that the average pore size and water absorption rate of the ceramic diffuser stone vary within a narrow temperature range of 1280~1420℃. This is mainly due to the characteristic that cordierite clinker is difficult to sinter and densify, allowing for controllable average pore size during preparation through particle stacking. Secondly, it can be seen that the average pore size of the ceramic diffuser stone increases at a firing temperature of 1420℃ compared to 1400℃. This is because cordierite clinker begins to decompose into a liquid phase above 1400℃, leading to overfiring and an increased average pore size. Therefore, a firing temperature of 1280~1420℃ is optimal. Furthermore, the above preparation method does not include high borosilicate glass powder in its formulation; therefore, the test results indicate that the diffuser stone prepared using this formulation has relatively average diffusion performance.

[0102] Experimental Example 6

[0103] In this experimental example, the preparation method of the ceramic aroma diffuser stone includes the following steps:

[0104] (1) The following raw materials are prepared according to the mass ratio: 34 parts of kaolin, 20 parts of alumina, 45 parts of cordierite clinker, and 1 part of bentonite; wherein, the raw materials contain K2O, Na2O, Fe2O3, MgO, and CaO, and the total mass of K2O, Na2O, Fe2O3, MgO, and CaO accounts for 2%; and the particle size of cordierite clinker is 20-45 μm;

[0105] (2) The raw materials prepared in step (1) are crushed by wet ball milling, and then an appropriate amount of water is added and mixed evenly to form a ceramic slurry;

[0106] (3) The ceramic slurry obtained in step (2) is formed into a blank by high-pressure injection molding. The injection pressure is maintained at 0.2 MPa and the process lasts for 10 seconds.

[0107] (4) The preform obtained in step (3) is subjected to high-temperature sintering. The temperature adjustment includes the following steps: Step (4-1) room temperature ~ 1000℃, heating rate is 5℃ / min; Step (4-2) 1000 ~ 1200℃, heating rate is 3℃ / min; Step (4-3) 1200 ~ firing temperature, heating rate is 1.5℃ / min; Step (4-4) holding time is 2 h.

[0108] Without changing the other steps mentioned above, the firing temperatures in step (4-3) were adjusted to 1320℃, 1340℃, and 1360℃, respectively. Simultaneously, at these three firing temperatures, 0%, 1%, 2%, 4%, 6%, and 8% high borosilicate glass powder were added by mass, respectively. The performance of the ceramic aroma diffusers prepared in these ways was then compared and tested. The test results are as follows:

[0109]

[0110] The test results above show that the pore size of ceramic aroma diffusers can be adjusted within a wide range after the addition of borosilicate glass powder. This is because the pores in ceramic aroma diffusers are mainly formed by the accumulation of cordierite clinker, and the borosilicate glass powder can fill these pores, thereby controlling their size. Specifically, adding 0-4% borosilicate glass powder can significantly control the pore size of ceramic aroma diffusers within the range of 0.5-2.0 μm. When the addition exceeds 4%, the change in pore size is small, and adding too much borosilicate glass powder can actually lead to larger pores. This is mainly because excessive borosilicate glass powder causes the sample to expand, altering the morphology of the pores.

Claims

1. A new ceramic fragrance diffusing stone, characterized by: The new ceramic fragrance diffusing stone is made of raw materials including kaolin 27.5-33.3%, alumina 20.6-24.5%, cordierite clinker 39.2-49.0%, bentonite 1-3%, high borosilicate glass powder 0-4%, and colorant 0-3%, and has an average pore size of 0.5-2 microns, and a water absorption of 9-20%.

2. A new ceramic fragrance diffusing stone according to claim 1, characterized in that: The raw materials include the following components: K2O+Na2O<1.0%, Fe2O3<2%, MgO<3%, CaO<2%, and the total mass of the components is not more than 4%.

3. A new ceramic fragrance diffusing stone as claimed in claim 1, characterized by: The particle size of the cordierite clinker is 20-45 microns, the particle size of the kaolin is 1-5 microns, and the particle size of the other raw materials is not more than 45 microns.

4. The method of producing a new ceramic fragrance diffusing stone according to any one of claims 1 to 3, characterized in that The method comprises the following steps: (1) preparing the following raw materials by mass: kaolin 27.5-33.3%, alumina 20.6-24.5%, cordierite clinker 39.2-49.0%, bentonite 1-3%, high borosilicate glass powder 0-4%, and colorant 0-3%; (2) crushing the raw materials prepared in step (1), adding an appropriate amount of water, and mixing uniformly to form a ceramic slurry; (3) injecting the ceramic slurry obtained in step (2) into a mold to form a green body; (4) sintering the green body obtained in step (3) at high temperature, under which the green body takes the cordierite clinker as a skeleton, and the other raw materials are in a liquid phase, the flow of the liquid phase is controlled by temperature adjustment, the gaps between the cordierite clinkers are filled, and the cordierite clinkers are connected, so as to adjust the water absorption and the average pore size, and finally a ceramic fragrance diffusing stone is obtained.

5. The preparation method of a novel ceramic aroma diffuser stone as described in claim 4, characterized in that: In step (2), the raw materials are crushed by wet ball milling.

6. The preparation method of a novel ceramic aroma diffuser stone as described in claim 4, characterized in that: In step (3), the ceramic slurry is used to form a green body by high-pressure injection molding.

7. The preparation method of a novel ceramic diffuser stone as described in claim 6, characterized in that: During the high-pressure injection molding, the injection pressure is kept at 0.2-0.3 MPa, and the process lasts for 10-30 seconds.

8. The preparation method of a novel ceramic diffuser stone as described in claim 4, characterized in that: In step (4), the temperature adjustment comprises the following steps: step (4-1) room temperature~1000℃, the heating rate is 5℃ / min; step (4-2) 1000~1200℃, the heating rate is 3℃ / min; step (4-3) 1200~firing temperature, the heating rate is 1.5℃ / min; step (4-4) holding time 2 h; wherein the firing temperature ranges from 1280 to 1420 ℃.

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