Sustained-fragrance-release ceramic material and preparation method therefor

Abstract

Disclosed in the present invention are a sustained-fragrance-release ceramic material and a preparation method therefor. The present invention relates to the technical field of fragrance products. The preparation method comprises: S1, uniformly mixing flaky aluminum oxide and calcined kaolin powder; S2, heating and stirring the powder while adding molten liquid paraffin in a hot state and an additive, and stirring the mixture to obtain a ceramic slurry; S3, subjecting the prepared ceramic slurry to vacuum evacuation, stirring, and hot-press molding to obtain a ceramic green body; S4, embedding the ceramic green body in sintered aluminum oxide powder, then placing same in a kiln for primary firing, taking out an embedded and fired ceramic block after cooling, and then performing surface treatment; and S5, impregnating the treated ceramic block with fragrance, and after the impregnation with the fragrance is complete, performing encapsulation after the surface of the ceramic block is dried. By optimizing the microporous structure of porous ceramic blocks and using hot-press molding, the present invention resolves the contradiction between light weight and high strength in conventional porous ceramics while exhibiting a relatively high porosity.

Description

Fragrance slow-release ceramic material and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of fragrance products, and in particular to a fragrance slow-release ceramic material and a preparation method thereof. BACKGROUND

[0002] Currently, there are mainly two kinds of fragrance products on the market: liquid type and solid type. Liquid fragrance volatilizes quickly and has obvious odor, but liquid fragrance has the problems of easy leakage, harsh storage environment, and potential combustion and explosion at high temperatures, so it is less used in vehicle-mounted fragrance; solid fragrance mainly includes fragrance paste and fragrance carrier, that is, the fragrance is made into solid paste or other carriers are used to absorb fragrance liquid, so that the fragrance is slowly released. Therefore, compared with liquid fragrance, solid fragrance has more free and convenient use scenarios and longer fragrance retention time.

[0003] Compared with liquid perfume, solid fragrance has more delicate fragrance and longer fragrance time. Common fragrance paste is a mixture of spices and paste, which is then placed in a container to form a paste shape and can be dispersed by natural volatilization; carrier products often use gypsum, silica gel, paper, ceramic, etc. as carrier media, adsorb a large amount of fragrance liquid, and control the volatilization rate to achieve long-lasting fragrance. Among the common carrier materials, the strength of the gypsum carrier is low, the fragrance absorption rate of the silica gel carrier is not high, and the porous ceramic carrier has excellent mechanical strength, stable physical and chemical properties, strong fragrance adsorption, and excellent decorative effect, becoming the preferred fragrance carrier material. By absorbing sufficient fragrance liquid, the ceramic material can have the function of slow and long-lasting fragrance dispersion. However, the general ceramic absorbs fragrance substances and penetrates into the ceramic product with a porous structure to store fragrance liquid in the pores, but the fragrance substances are released too quickly. In addition, some high-end users require the use of colored ceramic carriers, which are made by matching different colors of pigments with ceramic, having a unique decorative effect and being applicable to different occasions.

[0004] Currently, there are various methods for preparing porous ceramics, such as particle packing method, pore-forming agent method, extrusion molding method, foam impregnation method and foaming method, etc., but most of the processes are complex and the cost is also high. For example, a porous ceramic provided in Chinese Patent No. CN111807861A uses a dry pressing molding method, which is not only complicated in manufacturing process, but also cannot balance the final porosity and fragrance release time of the prepared ceramic; at the same time, it uses solid fragrance material melting impregnation, which increases the difficulty of fragrance absorption; for example, a multi-pore-size fragrance slow-release ceramic disclosed in Chinese Patent No. CN115893979A uses a dry pressing method to prepare a porous ceramic substrate, then prepares a whisker-reinforced microporous ceramic slurry, which is poured onto the surface of the porous ceramic substrate, and after drying treatment, the combination is obtained, which not only has a complex process, but also complicates the design of the product, and the porosity of the final porous ceramic substrate is only about 30%.

[0005] In addition, in order to meet the needs of high-end users to use colored ceramic carriers, the prior art usually dyes the finished fragrance ceramic product, but the dyeing agent will gradually decompose with the increase of use time, and after adding colorants in the raw materials, the colorants will affect the porosity and fragrance absorption rate of the ceramic material during the sintering process.

[0006] In summary, the present application aims to solve the problems of complex preparation process, low porosity and low fragrance absorption rate of the fragrance ceramic material in the prior art.

[0007] SUMMARY

[0008] The purpose of the present application is to solve the above problems of the prior art, and to provide a fragrance slow-release ceramic material and a preparation method thereof. The ceramic prepared by the present application has the characteristics of high porosity, and the pores in the ceramic store fragrance materials and slowly release fragrance.

[0009] The preparation method of the fragrance slow-release ceramic material of the present application comprises the following steps:

[0010] S1, uniformly mix the weighed flaky alumina and calcined kaolin powder;

[0011] S2, heat and stir the above-mentioned powder while adding hot molten liquid paraffin and additives, and obtain ceramic slurry after stirring for a period of time;

[0012] S3, vacuum stir and hot-press the prepared ceramic slurry to form a ceramic green body;

[0013] S4, bury the ceramic green body in alumina sintering powder, then put it into a kiln for primary sintering, take out the buried and sintered ceramic block after cooling, and then perform surface treatment;

[0014] S5, the ceramic block after processing is immersed in incense, and after the surface of the ceramic block is dried after the incense immersion is completed, packaging is performed.

[0015] Further, the S1 step further comprises a colorant, and the mass of the colorant is 1% to 10% of the sum of the mass of the colorant, the flaky alumina, and the calcined kaolin.

[0016] Further, the colorant is a metallic mineral phase colorant.

[0017] Further, the flaky alumina has a median particle size of 3 to 30 microns and a width-thickness ratio of 1 to 10, and the calcined kaolin has a median particle size of 1 to 3 microns.

[0018] Further, in the ceramic slurry, the mass ratio of the flaky alumina, the calcined kaolin, the paraffin wax, and the additive is 40 to 60:20 to 40:15 to 20:1 to 5.

[0019] Further, in the step S2, the heating temperature is 65 to 90 degrees Celsius, and the stirring time is 4 to 8 hours.

[0020] Further, the additive is beeswax, stearic acid, or oleic acid.

[0021] Further, the specific operation of the step S3 is as follows: the prepared ceramic slurry is added to a molding machine, the temperature is set to 60 to 75 degrees Celsius, vacuum is extracted and stirred for 10 to 300 minutes, and then hot-pressing casting is performed, the pressure is 0.4 to 0.8 MPa, and the pressure holding time is 5 to 30 seconds.

[0022] Further, in the step S4, the one-time firing temperature is controlled to be 1200 to 1400 degrees Celsius.

[0023] Further, after the firing is completed, the product is first subjected to vibration screening to remove buried powder, and then surface polishing treatment is performed on the product to remove adhered powder particles.

[0024] Further, the incense immersion method can be in the form of soaking or injecting incense according to requirements.

[0025] A fragrance slow-release ceramic material prepared by using the above preparation method.

[0026] The preparation of the fragrance slow-release ceramic material of the present application comprises the following raw materials: flaky alumina, calcined kaolin, solid paraffin wax, and an additive. The flaky alumina and the calcined kaolin serve as the raw material of the ceramic block and provide the ceramic block with porous properties. The paraffin wax has a low melting point and becomes liquid after heating, which facilitates slurry injection molding and cooling and solidification, which facilitates molding. Common additives include beeswax, stearic acid, and oleic acid, which can reduce the surface energy of the paraffin wax and powder particle interface, thereby reducing the amount of paraffin wax, increasing the solid phase content of the ceramic powder in the slurry, and obtaining good slurry fluidity.

[0027] By the above-mentioned raw material collocation, the flaky alumina with specific particle size and morphology and calcined kaolin are collocated, that is, the flaky alumina powder with fixed width-thickness ratio is used, the calcined kaolin is collocated, the heated liquid paraffin is added, and the slurry with stable characteristics is prepared by stirring and mixing uniformly, and then the ceramic block is obtained after hot-pressing casting and molding; the wax is removed in the first sintering at high temperature, the small-particle kaolin powder is bonded with the flaky alumina particles to form a large number of small pores, and meanwhile, due to the use of the flaky alumina, some larger pores are formed between the particles, as shown in Fig. 2. Therefore, the ceramic block with high porosity (the porosity can reach 45% to 55%) and specific pore size is manufactured without adding any pore-forming agent, the long-term emission of fragrance is ensured, and the performance guarantee for practical application is provided; meanwhile, the fragrance material is stored in the pores after use, and the fragrance is slowly released, the same fragrance liquid can be added repeatedly when the fragrance becomes weak, so that the ceramic block can be continuously used; even different fragrance liquids can be added after high-temperature treatment, the ceramic block can be repeatedly used for many times, the utilization rate is greatly improved, and the cost is reduced. Meanwhile, the ceramic block has different colors, and can be collocated with different fragrances according to the colors, so that the ceramic block has a unique decoration effect and can be applied in different occasions.

[0028] The fragrance-releasing ceramic material of the present application has high porosity by optimizing the micro-pore structure of the porous ceramic block and using the hot-pressing casting forming mode, and has the advantages of simple process and low cost. The raw materials with specific characteristics not only ensure the strength of the product, but also do not reduce the porosity of the product, so that the fragrance durability is ensured; meanwhile, the mold can be changed according to the requirements, so that products with various shapes can be prepared.

[0029] On the other hand, the liquid fragrance material is used in the present application, has obvious fragrance characteristics, and provides the fragrance ceramic with the ability of long-term emission of fragrance; then the fragrance material is stored and further slowed down by the absorption of the small pores in the product.

[0030] The present application has the following advantages:

[0031] 1. The present application uses the collocation of raw materials with specific particle size and morphology, mixes the colorant, and prepares the ceramic material with high porosity by the simple hot-pressing casting forming process without pore-forming agent, so as to provide a storage carrier with excellent performance for the fragrance material, overcome the low strength of the traditional fragrance ceramic carrier, realize the multi-absorption and slow release of the fragrance, and prepare the colored ceramic by adding the colorant in the raw material according to the requirements, which not only ensures the uniform mixing of colors, but also does not affect the porosity and fragrance absorption rate of the ceramic material in the sintering process.

[0032] 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.

[0033] 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.

[0034] 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

[0035] Figure 1 is an electron microscope image of the raw material, sheet-like alumina;

[0036] Figure 2 is a physical image of the fragrance ceramic block product prepared in Example 1;

[0037] Figure 3 shows the pore size measurement diagram of the fragrance slow-release ceramic material prepared in Example 1. Detailed Implementation

[0038] 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.

[0039] The preparation method of the fragrance slow-release ceramic material of the present invention includes the following specific steps:

[0040] 1. Add the weighed special flake alumina and calcined kaolin powder to the mixer and mix evenly;

[0041] 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.

[0042] Specifically, the median particle size of the flaky alumina powder is between 1 and 30 μm, preferably between 3 and 15 μm, to obtain better slurry properties and porosity of the final ceramic block; the width-to-thickness ratio of the flaky particles is between 1 and 20, preferably between 4 and 10, as shown in Fig. 1; and the median particle size of the calcined kaolin powder is between 1 and 10 μm; the additive can be beeswax, stearic acid or oleic acid, etc.

[0043] 3. The prepared ceramic slurry is added to a molding machine, the temperature is set to 60-75°C, vacuum is drawn and stirring is performed for 10-300 min, and then hot-press casting is performed, the pressure is between 0.4 and 0.8 MPa, and the pressure holding time is between 5 s and 30 s.

[0044] 4. To ensure the shape of the ceramic block during high-temperature sintering, the obtained ceramic green body is buried in a specific alumina sintering powder, and then placed in a kiln for primary firing. After cooling, the buried and fired ceramic block is taken out, and then surface treatment is performed.

[0045] Specifically, the primary firing temperature is controlled between 1200 and 1400°C; after firing is completed, the product is first screened by a vibrating screen to remove the buried powder, and then surface polishing is performed to remove the adhered powder particles.

[0046] 5. The treated product is subjected to incense immersion, and after the product surface is dried, it is packaged.

[0047] Specifically, the incense immersion method can be selected according to requirements, such as soaking and injection.

[0048] Example 1:

[0049] (1) Each of flaky alumina 3300 g and calcined kaolin 2700 g is weighed and placed in a mixer, ball-milled and mixed for 24 h, and then the powder is transferred to a stirrer, hot-melted paraffin 1470 g, beeswax 200 g and oleic acid 32 g are added, and mixed and stirred for 4 h to obtain a ceramic slurry;

[0050] (2) The ceramic slurry obtained in step (1) is transferred to a hot molding machine, vacuum is drawn and stirring is performed for 30 min, and then the hot-press pressure is adjusted to 0.6 MPa and the pressure holding time is 15 s to obtain a sample green body.

[0051] (3) The ceramic green body obtained in step (2) is buried and then sent to a kiln for primary firing at a temperature of 1300°C. After firing is completed, the sample is sorted by a vibrating screen to obtain a fired sample, as shown in Fig. 2.

[0052] (4) The ceramic block obtained in step (3) is surface polished to remove the adhered powder on the surface, and a finished product is obtained.

[0053] Finally, the porous ceramic block with a porosity of 49% was obtained by the above steps, and the ceramic block was soaked in the fragrance liquid for 24H, and the weight fragrance absorption rate could reach about 25%.

[0054] Figure 3 is a pore size distribution map of the fragrance slow-release ceramic material prepared in Example 1, and the corresponding average pore size is 643.73nm.

[0055] Example 2:

[0056] (1) Each of the weighed flaky alumina 4200g, calcined kaolin 1800g was ball-milled and mixed in a mixer for 24h, then the powder was transferred to a stirrer, hot melted paraffin 1470g, beeswax 200g and oleic acid 32g were added, and mixed and stirred for 4 hours to obtain a ceramic slurry;

[0057] (2) The ceramic slurry obtained in step (1) was transferred to a hot forming machine, vacuum was started and stirring was performed for 30min, after completion, the hot pressing pressure was adjusted to 0.6MPa, and the pressure holding time was 15s, and the sample green body was prepared.

[0058] (3) The ceramic green body obtained in step (2) was buried and then sent to a kiln for primary sintering, the temperature was 1300℃, after sintering was completed, the sample was subjected to vibration sorting to obtain a sintered sample.

[0059] (4) The ceramic block obtained in step (3) was polished to remove the adhered powder on the surface to obtain a finished product.

[0060] Finally, the porous ceramic block with a porosity of 51% was obtained by the above steps, and the ceramic block was soaked in the fragrance liquid for 24H, and the weight fragrance absorption rate could reach about 25%.

[0061] Example 3:

[0062] (1) Each of the weighed flaky alumina 4200g, calcined kaolin 1800g was ball-milled and mixed in a mixer for 24h, then the powder was transferred to a stirrer, hot melted paraffin 1470g, beeswax 200g and oleic acid 32g were added, and mixed and stirred for 4 hours to obtain a ceramic slurry;

[0063] (2) The ceramic slurry obtained in step (1) was transferred to a hot forming machine, vacuum was started and stirring was performed for 30min, after completion, the hot pressing pressure was adjusted to 0.6MPa, and the pressure holding time was 15s, and the sample green body was prepared.

[0064] (3) The ceramic green body obtained in step (2) was buried and then sent to a kiln for primary sintering, the temperature was 1300℃, after sintering was completed, the sample was subjected to vibration sorting to obtain a sintered sample.

[0065] (4) The ceramic block obtained in step (3) is polished to remove the adhered powder on the surface, and a finished product is obtained.

[0066] Finally, the porous ceramic block with a porosity of 51% is obtained according to the above steps, and the ceramic block is soaked in the fragrance liquid for 24H, and the weight fragrance absorption rate can reach about 25%.

[0067] In order to meet the needs of high-end users to use colored ceramic carriers, the prior art usually dyes the finished fragrance ceramic product, which can maintain the porosity and fragrance absorption capacity of the original color ceramic, but the dyeing agent will gradually decompose with the increase of use time. The present application adds colorants to the raw materials, which not only ensures uniform mixing of colors, but also does not affect the porosity and fragrance absorption rate of the ceramic material during the sintering process.

[0068] Specifically, the mass ratio of the sum of the mass of the colorant and the mass of the flaky alumina and calcined kaolin is 1% to 10%, which can be adjusted according to the actual color demand; the mixing method can be selected: directly adding the colorant to the wax slurry together with other raw materials, mixing and stirring the slurry, using a mixer to ball mill and mix, wet ball milling, drying after ball milling, and slurry preparation after crushing, among which the wet ball milling and crushing method is the most uniform in colorant mixing, but it is the most complex; directly mixing the slurry is the most convenient, but the colorant is easy to mix unevenly. The mixing time of each colorant and powder should be guaranteed for 12 to 24 hours, and the specific implementation is shown in Examples 4 and 5.

[0069] Example 4:

[0070] (1) Each 300g of colorant, 3135g of flaky alumina, and 2565g of calcined kaolin are placed in a mixer and ball-mixed for 24 hours, and the colorant accounts for 10% of the powder. Then the powder is transferred to a stirrer, 1500g of hot melted paraffin, 200g of beeswax, and 32g of oleic acid are added, and mixed and stirred for 4 hours to obtain ceramic slurry;

[0071] (2) The ceramic slurry obtained in step (1) is transferred to a hot forming machine, vacuum is started and stirring is performed for 30 minutes, then the hot pressing pressure is adjusted to 0.6MPa, and the pressure holding time is 15s, and the sample green body is prepared.

[0072] (3) The ceramic green body obtained in step (2) is buried and sent to a kiln for primary sintering at a temperature of 1250℃, and after sintering is completed, the sample is subjected to vibration sorting to obtain a sintered sample.

[0073] (4) The ceramic block obtained in step (3) is polished to remove the adhered powder on the surface, and a finished product is obtained.

[0074] Finally, the porous ceramic block with a porosity of 46% is obtained according to the above steps, and the ceramic block is soaked in the fragrance liquid for 24H, and the weight fragrance absorption rate can reach about 25%.

[0075] Example 5:

[0076] (1) Each of the pigments 600g, flaky alumina 2970g, calcined kaolin 2430g in a mixer, ball milling mixed for 24h, the pigment accounted for 10% in the powder, then the powder was transferred to a blender, hot melted paraffin 1500g, beeswax 200g and oleic acid 32g were added, mixed and stirred for 4 hours to obtain a ceramic slurry;

[0077] (2) The ceramic slurry obtained in step (1) was transferred to a hot forming machine, vacuum was started and stirring was carried out for 30 min, after completion, the hot pressing pressure was adjusted to 0.6 MPa, and the pressure holding time was 15 s, and the sample green body was prepared.

[0078] (3) The ceramic green body obtained in step (2) was buried and then sent to a kiln for primary sintering at a temperature of 1300℃, and after sintering was completed, the sample was sorted by vibration to obtain a sintered sample.

[0079] (4) The ceramic block obtained in step (3) was polished to remove the adhered powder on the surface to obtain a finished product.

[0080] Finally, a color porous ceramic block with a porosity of 45% was obtained according to the above steps, and the ceramic block was soaked in a fragrance liquid for 24H, and the weight fragrance absorption rate could reach about 25%.

[0081] Comparative Example 1:

[0082] (1) Each of another type of alumina 3300g (morphology is granular, median diameter is 2.1 μm), calcined kaolin 2700g was placed in a blender, hot melted paraffin 1470g, beeswax 200g and oleic acid 32g were added, mixed and stirred for 4 hours to obtain a ceramic slurry;

[0083] (2) The ceramic slurry obtained in step (1) was transferred to a hot forming machine, vacuum was started and stirring was carried out for 30 min, after completion, the hot pressing pressure was adjusted to 0.6 MPa, and the pressure holding time was 15 s, and the sample green body was prepared.

[0084] (3) The ceramic green body obtained in step (2) was buried and then sent to a kiln for primary sintering at a temperature of 1300℃, and after sintering was completed, the sample was sorted by vibration to obtain a sintered sample.

[0085] (4) The ceramic block obtained in step (3) was polished to remove the adhered powder on the surface to obtain a finished product.

[0086] Finally, a porous ceramic block with a porosity of 42% was obtained, and the ceramic block was soaked in a fragrance liquid for 24H, and the weight fragrance absorption rate could reach about 20%.

[0087] Comparative Example 2:

[0088] (1) Each of the pigments 300 g, another type of alumina 3300 g (morphology is granular, median diameter is 2.1 μm), calcined kaolin 2700 g were placed in a blender, hot melted paraffin 1470 g, beeswax 200 g and oleic acid 32 g were added, mixed and stirred for 4 hours to obtain a ceramic slurry;

[0089] (2) The ceramic slurry obtained in step (1) was transferred to a hot forming machine, vacuum was started and stirred for 30 min, after completion, the hot pressing pressure was adjusted to 0.6 MPa, and the pressure holding time was 15 s, and the sample green body was prepared.

[0090] (3) The ceramic green body obtained in step (2) was buried and sent to a kiln for first firing, the temperature was 1300℃, after firing, the sample was sorted by vibration, and the fired sample was obtained.

[0091] (4) The ceramic block obtained in step (3) was polished to remove the adhering powder on the surface, and the finished product was obtained.

[0092] Finally, a porous ceramic block with a porosity of 41% was obtained, and the ceramic block was soaked in a fragrance liquid for 24H, and the weight fragrance absorption rate could reach about 19%.

[0093] Test: The finished products prepared in the examples and comparative examples were measured and compared for porosity, density, fragrance absorption rate, fragrance dispersion rate, etc. The test data are shown in the table. Among them: the porosity, density, etc. are measured according to the national standard GB / T 25995-2010 "Fine Ceramic Density and Apparent Porosity Test Method", and the pore size is measured by mercury injection method; the fragrance absorption rate is calculated by the amount of fragrance absorbed after the ceramic block is completely soaked in the fragrance liquid for 24H, and the fragrance weight loss rate is calculated by the weight loss of the fragrance liquid after 180H of simulation of the installed fan test.

[0094] Table 1

[0095] As can be seen from Table 1, after changing the particle size and morphology of the raw materials in the comparative example, the porosity of the ceramic block prepared under the same organic content is still reduced, and it can be seen that the particle size and morphology of the material will directly affect the porosity of the colored ceramic.

[0096] The color porous ceramics in examples 1-5 respectively adjust the ceramic in the proportion of colorant and the proportion of powder, the final porosity can reach 45% and above, under the installed simulation test, the final flavor meets the customer's demand, and the weight loss is low, the fragrance retention capacity is stronger, and the color depth can be adjusted according to the demand, the amount of colorant can adjust the color of the sample, although it has a slight effect on the porosity, but the final test results reflect that the performance difference is not big; in the comparative examples 1 and 2, after replacing other materials, the porosity of the ceramic block is obviously reduced, causing the aroma absorption rate to decrease at the same time, and the final fragrance weight loss is more, and the fragrance retention capacity is poor.

[0097] The above not involved, applicable to the prior art.

[0098] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application, and those skilled in the art can make various modifications or supplements or replace with similar ways to the described specific embodiments, but will not deviate from the direction of the present application or beyond the scope defined by the appended claims. Those skilled in the art should understand that any modification, equivalent replacement, improvement, etc. made according to the technical essence of the present application to the above embodiments shall be included in the protection scope of the present application.

Claims

1. A method for the preparation of a fragrance slow release ceramic material, characterized by: It comprises the following steps: S1, uniformly mixing weighed flaky alumina and calcined kaolin powder; S2, heating and stirring the above-mentioned powder while adding hot melted liquid paraffin and additives, and obtaining ceramic slurry after stirring for a period of time; S3, vacuum stirring and hot-pressing the prepared ceramic slurry to form a green body; S4, burying the green body in alumina sintering powder, then putting it into a kiln for primary sintering, taking out the buried and sintered ceramic block after cooling, and then performing surface treatment; S5, immersing the treated ceramic block in incense, and packaging the ceramic block after the surface of the ceramic block is dried after incense immersion.

2. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: The S1 step further comprises a colorant, and the mass of the colorant is 1% to 10% of the sum of the masses of the colorant, flaky alumina and calcined kaolin; and / or The colorant is a metallic mineral phase colorant.

3. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: The median particle size of the flaky alumina is between 3 and 30 μm, and the width-thickness ratio is between 1 and 10; the median particle size of the calcined kaolin is between 1 and 3 μm.

4. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: In the ceramic slurry, the mass ratio of flaky alumina, calcined kaolin, paraffin and additives is 40-60:20-40:15-20:1-5.

5. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: In step S2, the heating temperature is 65-90℃, and the stirring time is 4-8 hours.

6. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: The additive is beeswax, stearic acid or oleic acid.

7. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: The specific operation of step S3 is as follows: the prepared ceramic slurry is added to a forming machine, the temperature is set to 60-75℃, vacuum is drawn and stirring is performed for 10-300 min, then hot-pressing is performed, the pressure is between 0.4 and 0.8 MPa, and the pressure holding time is 5-30 s.

8. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: In step S4, the primary sintering temperature is controlled to be between 1200 and 1400℃.

9. A method of making a fragrance-releasing ceramic material as claimed in claim 1, characterized in that: After sintering, the product is first screened by a vibrating screen to remove the buried powder, and then the product is surface polished to remove adhered powder particles; and / or the incense immersion method adopts a soaking or injection method.

10. A fragrance-releasing ceramic material prepared by the preparation method of any one of claims 1-9.

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