Fragrance-releasing ceramic material and method for its production

Abstract

The application discloses a kind of fragrance slow-release ceramic materials and preparation method thereof.The application relates to the technical field of fragrance product.The preparation method is as follows: S1, mixing flaky alumina and calcined kaolin powder uniformly;S2, the above-mentioned powder is heated and stirred while adding hot melted liquid paraffin and additives, and ceramic slurry is obtained by stirring;S3, the prepared ceramic slurry is vacuumized and stirred, and hot-pressing casting is formed, to obtain ceramic green body;S4, the ceramic green body is buried in alumina sintering powder, then put into kiln for first firing, and then take out the buried and fired ceramic block after cooling, and then surface treatment is carried out;S5, the treated ceramic block is immersed in fragrance, and after the fragrance immersion is completed, the ceramic block is dried, and then packaged.The application optimizes the micro-pore structure of porous ceramic block, and uses hot-pressing casting method, to overcome the contradiction between light weight and high strength of traditional porous ceramic, and has high porosity.

Description

Technical Field

[0001] This invention relates to the field of fragrance product technology, and in particular to a fragrance slow-release ceramic material and its preparation method. Background Technology

[0002] Currently, the most common fragrance products on the market mainly come in two types: liquid and solid. Liquid fragrances evaporate quickly and have a strong scent, but they are prone to leakage, require specific storage conditions, and may ignite or explode at high temperatures, so they are rarely used in car air fresheners. Solid fragrances mainly include fragrance balms and fragrance carriers, which are made into solid pastes or use other carriers to absorb the fragrance liquid, allowing the scent to be released slowly. Therefore, compared to liquid fragrances, solid fragrances are more versatile and convenient to use, and their scent lasts longer.

[0003] Solid fragrances, compared to liquid perfumes, offer a more delicate scent and a longer-lasting fragrance. Common fragrance balms are made by mixing fragrance with a paste and then placing it in a container to achieve a balm-like consistency, allowing the fragrance to dissipate naturally. Carrier-based products, on the other hand, often use materials such as plaster, silica gel, paper, and ceramics. These carriers absorb a large amount of fragrance liquid and control the evaporation rate, thus achieving a long-lasting scent. Among common carrier materials, plaster has relatively low strength, and silica gel has a low fragrance absorption rate. Porous ceramic carriers, however, are the preferred choice due to their excellent mechanical strength, stable physicochemical properties, strong fragrance absorption, and excellent decorative effect. By absorbing sufficient fragrance liquid, ceramic materials can achieve a long-lasting, slow-release fragrance. However, ordinary ceramics, after absorbing fragrance substances, permeate into the porous structure of the ceramic product, storing the fragrance liquid through the pores, but the fragrance substances are released too quickly. Furthermore, some high-end users request colored ceramic carriers, using different colored pigments to match the ceramic, providing a unique decorative effect suitable for various occasions.

[0004] Currently, there are various methods for preparing porous ceramics, such as particle stacking, pore-forming agent methods, extrusion molding, foam impregnation, and foaming methods. However, most of these processes are complex and costly. For example, Chinese patent CN111807861A discloses a porous ceramic using a dry pressing method. This method is not only complex in its manufacturing process, but also fails to achieve a balance between the final porosity and fragrance release time. Furthermore, its use of solid fragrance substances for melt impregnation increases the difficulty of fragrance absorption. Another example is a fragrance slow-release ceramic with multi-level pore sizes disclosed in CN115893979A. This technology uses dry pressing to prepare a porous ceramic matrix, then prepares a slurry of whisker-reinforced microporous ceramic, pours it onto the surface of the porous ceramic matrix, and obtains the composite after drying. This process is not only complex but also complicates the product design, and the final porous ceramic matrix has a porosity of only about 30%.

[0005] In addition, in order to meet the needs of high-end users for colored ceramic carriers, existing technologies usually dye the finished fragrance ceramics. However, the dyes will gradually decompose over time. Moreover, after adding colorants to the raw materials, the colorants will affect the porosity and fragrance absorption rate of the ceramic materials during the sintering process.

[0006] In summary, this application aims to address the problems of complex preparation processes, low porosity, and low fragrance absorption rate in existing fragrance ceramic materials. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art by proposing a fragrance-slow-release ceramic material and its preparation method. The ceramic prepared by this invention has the characteristic of high porosity, utilizing the pores in the ceramic to store fragrance substances and slowly release the fragrance.

[0008] The present invention discloses a method for preparing a fragrance-slow-release ceramic material, comprising the following steps:

[0009] S1. Mix the weighed flake alumina and calcined kaolin powder evenly.

[0010] S2. Heat and stir the above powder while adding hot-melted liquid paraffin and additives. Stir for a period of time to obtain ceramic slurry.

[0011] S3. The prepared ceramic slurry is vacuum stirred and hot-pressed to form a ceramic green body.

[0012] S4. The ceramic green body is embedded in alumina sintering powder, and then placed in a kiln for a first firing. After cooling, the embedded ceramic block is taken out and then surface treated.

[0013] S5. After the processed ceramic blocks are soaked in fragrance, they are packaged after the surface of the ceramic blocks has dried.

[0014] Furthermore, step S1 also includes a colorant, the mass of which is 1% to 10% of the sum of the mass of the colorant, flake alumina, and calcined kaolin.

[0015] Furthermore, the colorant is a metallic mineral phase colorant.

[0016] Furthermore, the median diameter of the flake alumina is between 3 and 30 μm, and the aspect ratio is between 1 and 10; the median diameter of the calcined kaolin is between 1 and 3 μm.

[0017] Furthermore, in the ceramic slurry, the mass ratio of flake alumina, calcined kaolin, paraffin wax, and additives is 40–60: 20–40: 15–20: 1–5.

[0018] Furthermore, in step S2, the heating temperature is 65℃~90℃, and the stirring time is 4~8 hours.

[0019] Furthermore, the additive is beeswax, stearic acid, or oleic acid.

[0020] Further, the specific operation of step S3 is as follows: the prepared ceramic slurry is added to the molding machine, the temperature is set at 60℃~75℃, vacuum is drawn and stirred for 10~300min, and then hot-press casting is performed, with the pressure between 0.4~0.8MPa and the holding time between 5s~30s.

[0021] Furthermore, in step S4, the firing temperature is controlled between 1200 and 1400°C.

[0022] Furthermore, after firing, the product is first subjected to vibration screening to remove the buried calcined powder, and then the surface of the product is polished to remove the adhering powder particles.

[0023] Furthermore, the infusion method can be either soaking or infusing, depending on the requirements.

[0024] A fragrance-releasing ceramic material prepared using the above-described preparation method.

[0025] The preparation of a fragrance-releasing ceramic material according to the present invention includes the following raw materials: flake alumina, calcined kaolin, solid paraffin wax, and additives. Flake alumina and calcined kaolin serve as raw materials for ceramic blocks, providing them with porous properties; paraffin wax has a low melting point, becomes liquid upon heating, is easy to inject into the slurry, and solidifies upon cooling, making it easy to mold; commonly used additives include beeswax, stearic acid, and oleic acid, which can reduce the surface energy at the interface between paraffin wax and powder particles, thereby reducing the amount of paraffin wax used, increasing the solid phase content of ceramic powder in the slurry, and obtaining good slurry flowability.

[0026] By combining the above raw materials, using flaky alumina with specific particle size and morphology and calcined kaolin, specifically by using flaky alumina powder with a fixed width-to-thickness ratio, combined with calcined kaolin, and adding heated liquid paraffin, a stable slurry is prepared. After hot pressing and casting, the paraffin solidifies upon cooling, resulting in a shaped ceramic block. A single sintering at high temperature removes the wax, and the small kaolin powder particles adhere to the flaky alumina particles, forming numerous fine voids. Simultaneously, due to the use of flaky alumina, some slightly larger pores are also formed between the particles, as shown in the attached image. Figure 2Therefore, without adding any pore-forming agents, ceramic blocks with high porosity (45%–55%) and specific pore sizes were manufactured, ensuring long-lasting fragrance release and providing performance assurance for practical applications. Furthermore, after use, the pores store fragrance substances and slowly release the scent; when the fragrance fades, the same fragrance liquid can be added repeatedly for continued use. Even after high-temperature treatment, different fragrance liquids can be added, enabling multiple reuses of the ceramic blocks, greatly improving utilization and reducing costs. Additionally, they come in different colors, allowing for color matching with different fragrances, thus also possessing a unique decorative function and applicable to various occasions.

[0027] This invention provides a fragrance-releasing ceramic material that optimizes the microporous structure of porous ceramic blocks and employs hot-pressing molding, resulting in high porosity while offering advantages such as simple processing and low cost. The specific properties of the raw materials ensure product strength without reducing porosity, thus guaranteeing fragrance durability. Furthermore, the mold can be modified to produce products of various shapes as needed.

[0028] On the other hand, the present invention uses a liquid fragrance substance with a distinct fragrance characteristic, which provides the fragrance ceramic with the ability to emit fragrance for a long time; then it is stored and further slowed down by absorption through the tiny pores inside the product.

[0029] The beneficial effects of this invention are:

[0030] 1. This invention utilizes the combination of raw materials with specific particle sizes and morphologies to mix colorants and prepare high-porosity ceramic materials through a simple hot-pressing molding process without pore-forming agents. This provides a high-performance storage carrier for fragrance substances, overcoming the shortcomings of traditional fragrance ceramic carriers with low strength, and achieving multi-absorption and slow release of fragrance. Furthermore, colored ceramics can be prepared by adding colorants to the raw materials as needed. This not only ensures uniform color mixing but also does not affect the porosity and fragrance absorption rate of the ceramic material during the sintering process.

[0031] 2. This invention uses a hot pressing casting process, including mixing, stirring and slurry preparation, hot pressing casting, one-time firing, and surface treatment. Compared with dry pressing, the difficulty is greatly reduced. At the same time, the use of one-time firing combines the traditional wax removal and firing processes, reducing costs, making the formed products more uniform, and increasing efficiency. The production difficulty is greatly reduced, and the product preparation can be completed by 1-2 people. In addition, one-time firing greatly shortens the time and improves efficiency.

[0032] 3. The products prepared by this invention have a higher degree of design freedom. Various shapes of products can be prepared according to the mold adjustment. The products themselves can also have different colors. At the same time, etching or glazing can be performed on the product surface to meet the needs of different scenarios. The decorative effect and application range of the products are greatly improved.

[0033] 4. This invention uses liquid fragrance, so the fragrance is more obvious and intense compared to solid fragrance, reducing the difficulty of fragrance absorption by the sample. Different fragrances can be added, and the color of the product can be matched with the fragrance to enhance the product's appearance. After long-term use, the fragrance can be added repeatedly for continued use, or different fragrance liquids can be added after high-temperature treatment, greatly improving the utilization rate of the ceramic block. Attached Figure Description

[0034] Figure 1 The image shows an electron microscope (EM) image of the raw material, sheet-like alumina.

[0035] Figure 2 This is a photograph of the fragrance ceramic block product prepared in Example 1;

[0036] Figure 3 The image shows the pore size measurement of the fragrance-releasing ceramic material prepared in Example 1. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] The preparation method of the fragrance slow-release ceramic material of the present invention includes the following specific steps:

[0039] 1. Add the weighed special flake alumina and calcined kaolin powder to the mixer and mix evenly;

[0040] 2. Place the mixed powder in a mixer, set the temperature to 65℃~90℃, and add the hot melted liquid paraffin and additives. After stirring for 4~8 hours, obtain the ceramic slurry.

[0041] Specifically, the median particle size of the flake-shaped alumina powder is between 1 and 30 μm, and preferably 3-15 μm to obtain better slurry characteristics and porosity of the final ceramic block; the aspect ratio of its flake particles is between 1 and 20, preferably between 4 and 10, as shown in the attached figure. Figure 1 Meanwhile, in order to have a better match with the flake alumina, the median particle size of the calcined kaolin powder is selected to be between 1 and 10 μm; the additives can be beeswax, stearic acid or oleic acid, etc.

[0042] 3. Add the prepared ceramic slurry to the molding machine, set the temperature to 60℃~75℃, evacuate and stir for 10~300min, then hot press casting, with a pressure between 0.4~0.8MPa and a holding time of 5s~30s.

[0043] 4. To ensure the shape of the ceramic block during high-temperature sintering, we need to embed the obtained ceramic green body in specific alumina sintering powder, then place it in a kiln for a single firing. After cooling, the embedded ceramic block is removed and then surface treated.

[0044] Specifically, the firing temperature is controlled between 1200 and 1400°C. After firing, the product is first screened by vibration to remove the buried powder, and then the product is surface polished to remove the adhering powder particles.

[0045] 5. After the processed product is soaked in fragrance, it is packaged after the surface of the product is dried.

[0046] Specifically, the infusion method can be either soaking or infusing, depending on the requirements.

[0047] Example 1:

[0048] (1) Weigh 3300g of flake alumina and 2700g of calcined kaolin into a mixer and ball mill them for 24 hours. Then transfer the powder to a mixer and add 1470g of hot melted paraffin wax, 200g of beeswax and 32g of oleic acid. Mix and stir for 4 hours to obtain ceramic slurry.

[0049] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0050] (3) The ceramic green body obtained in step (2) is embedded and then sent to a kiln for a first firing at a temperature of 1300℃. After firing, the sample is sorted by vibration to obtain the fired sample, such as Figure 2 .

[0051] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0052] Finally, following the above steps, a porous ceramic block with a porosity of 49% was obtained. After soaking the ceramic block in fragrance liquid for 24 hours, its weight fragrance absorption rate can reach about 25%.

[0053] Figure 3 The pore size distribution spectrum of the fragrance slow-release ceramic material prepared in Example 1 shows an average pore size of 643.73 nm.

[0054] Example 2:

[0055] (1) Weigh 4200g of flake alumina and 1800g of calcined kaolin into a mixer and ball mill them for 24 hours. Then transfer the powder to a mixer and add 1470g of hot melted paraffin wax, 200g of beeswax and 32g of oleic acid. Mix and stir for 4 hours to obtain ceramic slurry.

[0056] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0057] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1300℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0058] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0059] Finally, following the above steps, a porous ceramic block with a porosity of 51% was obtained. After soaking the ceramic block in fragrance liquid for 24 hours, its weight-based fragrance absorption rate reached about 25%.

[0060] Example 3:

[0061] (1) Weigh 3750g of flake alumina and 2250g of calcined kaolin into a mixer and ball mill them for 24 hours. Then transfer the powder to a mixer and add 1470g of hot melted paraffin wax, 200g of beeswax and 32g of oleic acid. Mix and stir for 4 hours to obtain ceramic slurry.

[0062] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0063] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1250℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0064] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0065] Finally, following the above steps, a porous ceramic block with a porosity of 51% was obtained. After soaking the ceramic block in fragrance liquid for 24 hours, its weight-based fragrance absorption rate reached about 25%.

[0066] To meet the demand of high-end users for colored ceramic carriers, existing technologies typically dye finished fragrance ceramics to maintain the porosity and fragrance absorption capacity of the original colored ceramics. However, the dyes gradually decompose over time. This invention adds colorants to the raw materials, which not only ensures uniform color mixing but also does not affect the porosity and fragrance absorption rate of the ceramic material during the sintering process.

[0067] Specifically, the mass ratio of the pigment to the sum of the masses of flake alumina and calcined kaolin is 1% to 10%, which can be adjusted according to the actual color requirements. Mixing methods can include: directly adding the pigment and other raw materials to the wax slurry and stirring; ball milling using a mixer; wet ball milling, followed by drying, pulverizing, and slurry preparation. Wet ball milling provides the most uniform pigment mixing but is the most complex; direct slurry mixing is the most convenient, but pigment mixing can be uneven. The mixing time for each pigment and powder should be between 12 and 24 hours, as detailed in Examples 4 and 5.

[0068] Example 4:

[0069] (1) Weigh 300g of pigment, 3135g of flake alumina and 2565g of calcined kaolin into a mixer and ball mill them for 24 hours. The pigment accounts for 10% of the powder. Then transfer the powder to a mixer and add 1500g of hot melted paraffin, 200g of beeswax and 32g of oleic acid. Mix and stir for 4 hours to obtain ceramic slurry.

[0070] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0071] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1250℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0072] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0073] Finally, following the above steps, a colored porous ceramic block with a porosity of 46% was obtained. When the ceramic block was soaked in fragrance liquid for 24 hours, its weight fragrance absorption rate reached about 25%.

[0074] Example 5:

[0075] (1) Weigh 600g of pigment, 2970g of flake alumina and 2430g of calcined kaolin into a mixer and ball mill them for 24 hours. The pigment accounts for 10% of the powder. Then transfer the powder to a mixer and add 1500g of hot melted paraffin, 200g of beeswax and 32g of oleic acid. Mix and stir for 4 hours to obtain ceramic slurry.

[0076] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0077] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1300℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0078] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0079] Finally, following the above steps, a colored porous ceramic block with a porosity of 45% was obtained. When the ceramic block was soaked in fragrance liquid for 24 hours, its weight fragrance absorption rate reached about 25%.

[0080] Comparative Example 1:

[0081] (1) Weigh 3300g of another type of alumina (granular morphology, median diameter of 2.1μm) and 2700g of calcined kaolin and place them in a mixer. Add 1470g of hot melted paraffin, 200g of beeswax and 32g of oleic acid, mix and stir for 4 hours to obtain ceramic slurry;

[0082] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0083] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1300℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0084] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0085] Ultimately, a porous ceramic block with a porosity of 42% was obtained. When the ceramic block was soaked in fragrance liquid for 24 hours, its weight-based fragrance absorption rate reached about 20%.

[0086] Comparative Example 2:

[0087] (1) Weigh 300g of each colorant, 3300g of another type of alumina (granular in shape, median diameter of 2.1μm), and 2700g of calcined kaolin and place them in a mixer. Add 1470g of hot melted paraffin wax, 200g of beeswax and 32g of oleic acid, mix and stir for 4 hours to obtain ceramic slurry;

[0088] (2) Transfer the ceramic slurry obtained in step (1) into a hot molding machine, start vacuuming and stirring for 30 minutes. After completion, adjust the hot pressing pressure to 0.6 MPa and the holding time to 15 seconds to obtain the sample green body.

[0089] (3) The ceramic green body obtained in step (2) is buried and then sent into the kiln for a first firing at a temperature of 1300℃. After firing, the sample is sorted by vibration to obtain the fired sample.

[0090] (4) The ceramic block obtained in step (3) is polished to remove the adhering powder on the surface, and the finished product is obtained.

[0091] Ultimately, a porous ceramic block with a porosity of 41% was obtained. When the ceramic block was soaked in fragrance liquid for 24 hours, its weight fragrance absorption rate reached about 19%.

[0092] Testing: The porosity, density, fragrance absorption rate, and fragrance dissipation rate of the finished products obtained in the examples and comparative examples were measured and compared. The test data are shown in the table. Among them, porosity and density were measured in accordance with the national standard GB / T 25995-2010 "Test Method for Density and Apparent Porosity of Fine Ceramics", and pore size was measured using the mercury porosimetry method. The fragrance absorption rate was calculated by immersing the ceramic block completely in the fragrance liquid for 24 hours, and the fragrance weight loss rate was calculated by simulating the weight loss of the fragrance liquid after 180 hours of testing with a simulated installed fan.

[0093] Table 1

[0094] sample Porosity Bulk density g / cm3 Pigment addition percentage Scent absorption rate by weight (%) Installation test of fragrance weightlessness Example 1 48.65％ 1.667 0％ 26.29％ 23.42％ Example 2 50.80％ 1.697 0％ 26.97％ 23.63％ Example 3 50.63％ 1.653 0％ 26.53％ 23.89％ Example 4 48.43％ 1.760 5％ 25.53％ 24.75％ Example 5 42.86％ 1.988 10％ 22.29％ 27.93％ Comparative Example 1 46.02％ 1.815 0％ 20.17％ 32.40％ Comparative Example 2 34.22％ 2.102 5％ 15.31％ 35.79％

[0095] As shown in Table 1, the porosity of the ceramic blocks prepared under the same organic content decreased even after changing the raw materials with different particle sizes and morphologies. This indicates that the particle size and morphology of the material directly affect the porosity of the colored ceramics.

[0096] The colored porous ceramics in Examples 1-5 were adjusted in terms of the proportion of pigments and powders, resulting in a final porosity of 45% or higher. Under simulated testing, the final fragrance met customer requirements, with low weight loss and stronger fragrance retention. The color depth could also be adjusted according to needs, and the amount of pigment could be adjusted to change the sample color. Although this slightly affected the porosity, the final test results showed little difference in performance. In Comparative Examples 1 and 2, after replacing other materials, the porosity of the ceramic blocks was significantly reduced, resulting in a decrease in the fragrance absorption rate in the same amount of time. At the same time, the final fragrance lost more weight and the fragrance retention was worse.

[0097] For any points not covered above, existing technologies shall apply.

[0098] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the direction of the invention or exceeding the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a fragrance-slow-release ceramic material, characterized in that: Includes the following steps: S1. Mix the weighed flake alumina and calcined kaolin powder evenly. S2. Heat and stir the above powder while adding hot-melted liquid paraffin and additives. Stir for a period of time to obtain ceramic slurry. S3. The prepared ceramic slurry is vacuum stirred and hot-pressed to form a ceramic green body. S4. The ceramic green body is embedded in alumina sintering powder, and then placed in a kiln for a first firing. After cooling, the embedded ceramic block is taken out and then surface treated. S5. After the processed ceramic blocks are soaked in fragrance, they are packaged after the surface of the ceramic blocks has dried. The median diameter of the flaky alumina particles is between 3 and 30 μm, and the aspect ratio is between 1 and 10; the median diameter of the calcined kaolin is between 1 and 3 μm.

2. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: The S1 step also includes a colorant, the mass of which is 1% to 10% of the sum of the mass of the colorant, flake alumina, and calcined kaolin.

3. The method for preparing a fragrance-releasing ceramic material as described in claim 2, characterized in that: The colorant mentioned is a metallic mineral phase colorant.

4. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: In ceramic slurry, the mass ratio of flake alumina, calcined kaolin, paraffin wax and additives is 40-60:20-40:15-20:1-5.

5. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: In step S2, the heating temperature is 65℃~90℃, and the stirring time is 4~8 hours.

6. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: The additives mentioned are beeswax, stearic acid, or oleic acid.

7. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: The specific operation of step S3 is as follows: add the prepared ceramic slurry into the molding machine, set the temperature to 60℃~75℃, evacuate and stir for 10~300min, and then hot press casting is performed, with the pressure between 0.4~0.8MPa and the holding time between 5s~30s.

8. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: In step S4, the firing temperature is controlled between 1200 and 1400°C.

9. The method for preparing a fragrance-releasing ceramic material as described in claim 1, characterized in that: After firing, the product is first subjected to vibration screening to remove the buried calcined powder, and then the product is surface polished to remove the adhering powder particles; and / or, the fragrance infusion method is by soaking or / and fragrance injection.

10. A fragrance-releasing ceramic material, wherein the fragrance-releasing ceramic material is prepared by the preparation method according to any one of claims 1-9.

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