A lees-based slow-release aromatic deodorizing cat litter and a preparation method thereof

Abstract

The present application belongs to the technical field of cat litter, and particularly relates to a distiller's grains based slow-release aromatic deodorizing cat litter and a preparation method thereof. The preparation method of the cat litter comprises the following steps: mixing 40-mesh to 100-mesh distiller's grains particles, distiller's grains biochar loaded with essential oil and sodium-based bentonite, extruding and granulating, and drying to obtain the cat litter; the weight percentage of the raw materials is as follows: 10% to 40% of 100-mesh distiller's grains particles, 10% to 40% of distiller's grains biochar loaded with essential oil, and 20% to 80% of sodium-based bentonite, with a total of 100%; a triple synergistic deodorizing mechanism is constructed; the essential oil is first anchored in the pores of the biochar, realizing slow and controllable release of the essential oil, overcoming the shortcomings of fast volatile and poor durability of traditional cat litter, and making the fragrance retention effect last for 4 weeks.

Description

Technical Field

[0001] This invention belongs to the field of cat litter technology, specifically relating to a distillers' grains-based slow-release aromatic deodorizing cat litter and its preparation method. Background Technology

[0002] Bentonite cat litter, currently the main pet bedding material on the market, has core mineral components that are non-renewable resources, resulting in a large amount of solid waste. More importantly, waste bentonite cat litter has extremely poor biodegradability in the natural environment. After use, it is often mixed with household waste for landfill or incineration, which not only occupies land resources but also easily generates a large amount of solid waste, putting long-term pressure on the environment's carrying capacity.

[0003] To address the aforementioned environmental issues, existing publicly available technologies propose a type of eco-friendly cat litter made from distiller's grains, aiming to achieve biodegradability through formula improvement. However, this eco-friendly cat litter relies solely on the addition of chemical fragrances or deodorizers to mask odors. In actual use, the effective ingredients are prone to rapid volatilization or loss due to changes in ambient temperature and humidity. Therefore, such products generally suffer from short-lived deodorizing effects and poor fragrance longevity, failing to meet consumers' actual demand for long-lasting odor neutralization while ensuring environmental friendliness. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a slow-release aromatic deodorizing cat litter based on distillers' grains and its preparation method, which solves the problem of rapid volatilization of the effective components in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A slow-release aromatic deodorizing cat litter based on distillers' grains is prepared by the following method: 40-100 mesh distillers' grains particles, distillers' grains biochar loaded with essential oils, and sodium bentonite are mixed, extruded and granulated, and dried to obtain the cat litter. The granules of distiller's grains mainly provide functions such as water absorption and odor adsorption; the biochar of distiller's grains is the core component of this invention, which can be loaded with essential oils with specific aromatic scents and provide a long-lasting slow-release effect; sodium bentonite has the properties of water absorption, agglomeration and binding, which can bind the granules of distiller's grains, biochar of distiller's grains, etc., and obtain the distiller's grains-based slow-release aromatic deodorizing cat litter product by extrusion granulation. Sodium-based bentonite possesses highly efficient water absorption, clumping, and binding properties, along with low dust, good chemical stability, and non-irritating characteristics, making it a key component of mineral cat litter. This invention introduces this component in combination with distiller's grains granules and distiller's grains biochar to form a ternary cat litter. Its main function here is to provide clumping and binding properties, allowing the distiller's grains powder and biochar to form solid strips or granules of distiller's grains-based slow-release aromatic deodorizing cat litter.

[0006] The sustained-release effect is mainly provided by biochar, whose internal porous structure can be used to load essential oils and provide a slow-release function.

[0007] The raw materials for preparing cat litter are as follows by weight percentage: 40-100 mesh distiller's grains 10%-40%, oil-loaded distiller's grains biochar 10%-40%, sodium bentonite 20%-80%, totaling 100%.

[0008] Furthermore, the preparation steps of the essential oil-loaded distiller's grains biochar are as follows: 40-mesh distiller's grains were heated to 450℃~650℃ at 5℃ / min under an inert atmosphere for 2h~4h to obtain distiller's grains biochar. Anhydrous ethanol is mixed with essential oil to obtain essential oil diluted with anhydrous ethanol; Essential oil diluted with anhydrous ethanol was blended with distillers' grains biochar to obtain distillers' grains biochar loaded with essential oil. The particle size of the biochar from the fermentation tank is 60 mesh to 100 mesh. The mass ratio of essential oil to distillers' lees biochar is (1~10):100; in the mixture of anhydrous ethanol and essential oil, the mass ratio of anhydrous ethanol to essential oil is 2:1.

[0009] Furthermore, the essential oil is a natural plant essential oil, including one or more of lavender essential oil, cedarwood essential oil, and green tea essential oil.

[0010] Furthermore, the inert atmosphere includes a nitrogen atmosphere.

[0011] Furthermore, the blending process involves mixing essential oil diluted with anhydrous ethanol with distillers' grains biochar via spraying, and then allowing it to stand for 1 to 4 hours.

[0012] Furthermore, the preparation method of the distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: Mix the raw materials in a certain proportion to obtain a mixed dry powder; The dry powder was mixed with deionized water at a mass ratio of 100:15 to obtain a wet material. The wet material is extruded and granulated to obtain wet particles with a pore size of 2mm to 4mm; The wet granules are dried to obtain distillers' grains-based slow-release aromatic deodorizing cat litter.

[0013] Furthermore, the drying temperature is 40℃~60℃.

[0014] The application of the aforementioned cat litter in deodorization.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention provides a slow-release aromatic deodorizing cat litter based on distillers' grains, prepared by the following method: 40-100 mesh distillers' grains, distillers' grains biochar loaded with essential oils, and sodium-based bentonite are mixed, extruded and granulated, and dried to obtain the cat litter; the weight percentages of the raw materials are as follows: 40-100 mesh distillers' grains 10%-40%, distillers' grains biochar loaded with essential oils 10%-40%, sodium-based bentonite 20%-80%, totaling 100%; this cat litter has the following properties: The triple synergistic deodorization mechanism of "physical adsorption + chemical masking + structural slow release" is as follows: Both the lees granules and the lees biochar have a porous structure, which can efficiently adsorb odor molecules such as ammonia and hydrogen sulfide; the natural plant essential oils themselves are aromatic and can effectively mask odors; the unique process of "loading first and then granulating" is used to anchor the essential oils in the pores of the biochar, realizing the slow and controllable release of the essential oils, overcoming the shortcomings of traditional cat litter fragrances that evaporate quickly and have poor persistence, so that the fragrance lasts for up to 4 weeks.

[0016] (2) This invention uses brewing waste lees as the main raw material, realizing the high-value-added resource utilization of solid waste and reducing environmental pressure; the main components of the final product are biodegradable materials, which meet the requirements of sustainable development.

[0017] (3) The distillers' grains-based slow-release aromatic deodorizing cat litter of the present invention can be antibacterial and mildew-proof. The dry microenvironment created by natural plant essential oils and biochar works together to effectively inhibit the growth of bacteria and mold in the cat litter box and improve the level of pet hygiene and safety. Attached Figure Description

[0018] Figure 1 This is a process flow diagram of the preparation process of the distillers' grains-based slow-release aromatic deodorizing cat litter and its preparation method.

[0019] Figure 2 This is a visual representation of the waste products from the preparation process, including lees particles, lees biochar, essential oil-loaded biochar, and the lees-based slow-release aromatic deodorizing cat litter from Example 2.

[0020] Figure 3 The bulk density of cat litter in Examples 1-3 and Comparative Examples 1-2 is shown.

[0021] Figure 4 The water absorption rate of cat litter is shown in Examples 1-3 and Comparative Examples 1-2.

[0022] Figure 5 The litter breakage rates are for Examples 1-3 and Comparative Examples 1-2.

[0023] Figure 6 The ammonia adsorption capacity of cat litter in Examples 1-3 and Comparative Examples 1-2 is shown.

[0024] Figure 7This is a comparison of the antibacterial ability of cat litter in Example 2 and Comparative Example 2. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to embodiments, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the technical means used in the following embodiments are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; the materials, reagents, etc. used are all commercially available products in the art or prepared by conventional methods in the art.

[0026] Sodium-based bentonite was sourced from Maclean's, CAS No. 85049-30-5, item number B991755; essential oil was sourced from Jiangxi Yuanshangcao Fragrance Co., Ltd., CAS No. 8000-28-0; and distiller's grains were sourced from Anhui Gujinggong Liquor Co., Ltd.

[0027] The technical solution of the present invention will be described in detail below.

[0028] This invention first provides a method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter, such as... Figure 1 As shown, it includes the following steps: S1. Treatment of distiller's grains waste: Take fresh distiller's grains waste, dry it with forced air until constant weight, crush it and pass it through a 40-mesh sieve to obtain distiller's grains particles.

[0029] S2. Preparation of biochar from distiller's grains: Take the above-mentioned distiller's grains, place them in a tube furnace for activation and carbonization, take them out after natural cooling, crush them through an 80-mesh sieve, and obtain biochar from distiller's grains.

[0030] S3. Preparation of biochar loaded with essential oil: Weigh a certain amount of distiller's grains biochar and mix it evenly with a certain amount of diluted natural plant essential oil by spraying. After standing and drying, biochar loaded with essential oil is obtained.

[0031] S4. Preparation of ternary compound cat litter: Weigh out the granules of distiller's grains, biochar loaded with essential oils, and sodium bentonite in sequence according to a certain weight percentage, and mix the three raw materials evenly.

[0032] S5. Granulation, drying, and sieving are carried out using a small screw extruder with a 3mm aperture to obtain distillers' grains-based slow-release aromatic deodorizing cat litter.

[0033] The technical effects of the present invention will be described below through specific embodiments and comparative examples.

[0034] Example 1 A method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: S1. Raw material preparation: Take fresh distiller's grains waste, such as... Figure 2The raw material of the distiller's grains shown was dried at 80°C to constant weight by forced air drying. A portion of it was then pulverized and passed through a 40-mesh sieve to obtain 40-mesh distiller's grains particles, such as... Figure 2 The first part is the granulated lees shown; the second part is crushed and passed through a 100-mesh sieve to obtain 100-mesh lees granules.

[0035] S2. Take the above-mentioned 40-mesh distiller's grains and place them in a tube furnace. Under a nitrogen atmosphere, heat the furnace to 550°C at a rate of 5°C / min, hold for 2 hours, and after natural cooling, remove the furnace, pulverize it, and pass it through an 80-mesh sieve to obtain distiller's grains biochar. Figure 2 The image shows biochar made from distiller's grains.

[0036] S3. Weigh 10g of distiller's grains biochar. Dilute 0.1g of lavender essential oil with 0.2g of anhydrous ethanol, then mix the diluted lavender essential oil with the biochar via spraying. Let the mixture stand in a ventilated area for 1 hour until the ethanol has completely evaporated, obtaining biochar loaded with lavender essential oil. Figure 2 The essential oil biochar shown.

[0037] S4. Weigh the following by weight percentage: 10% 100-mesh distiller's grains, 10% of the above-mentioned biochar loaded with essential oils, and 80% sodium bentonite. Put the three raw materials into a V-type material mixer and dry mix for 15 minutes until the color is uniform to obtain a mixed dry powder. Mix the mixed dry powder with deionized water at a mass ratio of 100:15, spraying and stirring at the same time, until it reaches the state of being able to be formed into a ball by hand and easily dispersed by light touch.

[0038] S5. Granulation is carried out using a laboratory-scale screw extrusion granulator with a 3mm aperture.

[0039] S6. Place the extruded wet granules in a 60℃ forced-air drying oven and dry for 2 hours. After cooling, pass them through a 20-mesh sieve to remove smaller powder particles to obtain the finished product: distillers' grains-based slow-release aromatic deodorizing cat litter.

[0040] Example 2 A method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: S1. Raw material preparation: Take fresh distiller's grains, dry them at 80℃ with forced air until constant weight, crush them and pass them through a 40-mesh sieve to obtain 40-mesh distiller's grains particles; crush another part and pass it through a 100-mesh sieve to obtain 100-mesh distiller's grains particles.

[0041] S2. Take the above 40-mesh distiller's grains, place them in a tube furnace, heat them to 550°C at 5°C / min under a nitrogen atmosphere, keep them at that temperature for 2 hours, and after natural cooling, take them out, crush them through an 80-mesh sieve to obtain distiller's grains biochar.

[0042] S3. Weigh 10g of distiller's grains biochar, dilute 0.1g of lavender essential oil with 0.2g of anhydrous ethanol, mix the lavender essential oil with the biochar by spraying, and let it stand in a ventilated place for 1 hour until the ethanol completely evaporates to obtain biochar loaded with lavender essential oil.

[0043] S4. Weigh the following by weight percentage: 20% 100-mesh distiller's grains, 20% of the above-mentioned biochar loaded with essential oils, and 60% sodium bentonite. Put the three raw materials into a V-type material mixer and dry mix for 15 minutes until the color is uniform to obtain a mixed dry powder. Mix the mixed dry powder with deionized water at a mass ratio of 100:15, spraying and stirring at the same time until it reaches the state of being able to be formed into a ball by hand and easily dispersed by light touch.

[0044] S5. Granulation is carried out using a laboratory-scale screw extrusion granulator with a 3mm aperture.

[0045] S6. Place the extruded wet granules in a 60℃ forced-air drying oven and dry for 2 hours. After cooling, pass them through a 20-mesh sieve to remove smaller powder particles to obtain the finished product: distillers' grains-based slow-release aromatic deodorizing cat litter.

[0046] Example 3 A method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: S1. Raw material preparation: Take fresh distiller's grains, dry them at 80℃ with forced air until constant weight, crush them and pass them through a 40-mesh sieve to obtain 40-mesh distiller's grains particles; crush another part and pass it through a 100-mesh sieve to obtain 100-mesh distiller's grains particles.

[0047] S2. Take the above 40-mesh distiller's grains, place them in a tube furnace, heat them to 550°C at 5°C / min under a nitrogen atmosphere, keep them at that temperature for 2 hours, and after natural cooling, take them out, crush them through an 80-mesh sieve to obtain distiller's grains biochar.

[0048] S3. Weigh 10g of distiller's grains biochar, dilute 0.1g of lavender essential oil with 0.2g of anhydrous ethanol, mix the lavender essential oil with the biochar by spraying, and let it stand in a ventilated place for 1 hour until the ethanol completely evaporates to obtain biochar loaded with lavender essential oil.

[0049] S4. Weigh the following by weight percentage: 30% 100-mesh distiller's grains, 30% biochar loaded with essential oils, and 40% sodium bentonite. Put the three raw materials into a V-type material mixer and dry mix for 15 minutes until the color is uniform to obtain a mixed dry powder. Mix the mixed dry powder with deionized water at a mass ratio of 100:15, spraying and stirring at the same time, until it can be formed into a ball by hand and dispersed with a light touch.

[0050] S5. Granulation is carried out using a laboratory-scale screw extrusion granulator with a 3mm aperture.

[0051] S6. Place the extruded wet granules in a 60℃ forced-air drying oven and dry for 2 hours. After cooling, pass them through a 20-mesh sieve to remove smaller powder particles to obtain the finished product: distillers' grains-based slow-release aromatic deodorizing cat litter.

[0052] Example 4 A method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: S1. Raw material preparation: Take fresh distiller's grains, dry them at 80℃ with forced air until constant weight, crush them and pass them through a 40-mesh sieve to obtain 40-mesh distiller's grains particles.

[0053] S2. Take a portion of 40-mesh distiller's grains, place them in a tube furnace, heat them to 450°C at 5°C / min under a nitrogen atmosphere, keep them at that temperature for 4 hours, and after natural cooling, take them out, crush them through a 60-mesh sieve to obtain distiller's grains biochar.

[0054] S3. Weigh 10g of distiller's grains biochar, dilute 1g of lavender essential oil with 2g of anhydrous ethanol, mix it evenly with the biochar by spraying, and let it stand in a ventilated place for 4 hours until the ethanol completely evaporates to obtain biochar loaded with lavender essential oil.

[0055] S4. Weigh the following by weight percentage: 40% of the remaining 40-mesh distiller's grains, 40% of the above-mentioned biochar loaded with essential oils, and 20% of sodium bentonite. Put the three raw materials into a V-type material mixer and dry mix for 15 minutes until the color is uniform to obtain a mixed dry powder. Mix the mixed dry powder with deionized water at a mass ratio of 100:15, spraying and stirring at the same time, until it reaches the state of being able to be formed into a ball by hand and easily dispersed by light touch.

[0056] S5. Granulation is carried out using a laboratory-scale screw extrusion granulator with a 2mm aperture.

[0057] S6. Place the extruded wet granules in a 40℃ forced-air drying oven and dry for 2 hours. After cooling, pass them through a 20-mesh sieve to remove smaller powder particles to obtain the finished product, distillers' grains-based slow-release aromatic deodorizing cat litter.

[0058] Example 5 A method for preparing a distillers' grains-based slow-release aromatic deodorizing cat litter includes the following steps: S1. Raw material preparation: Take fresh distiller's grains and dry them at 80℃ with forced air until constant weight. Crush a portion and pass it through a 40-mesh sieve to obtain 40-mesh distiller's grains particles; crush the other portion and pass it through a 100-mesh sieve to obtain 100-mesh distiller's grains particles.

[0059] S2. Take 40-mesh distiller's grains, place them in a tube furnace, heat them to 650℃ at 5℃ / min under a nitrogen atmosphere, keep them at that temperature for 2 hours, and after natural cooling, take them out, crush them and pass them through a 100-mesh sieve to obtain distiller's grains biochar.

[0060] S3. Weigh 10g of distiller's grains biochar, dilute 0.1g of lavender essential oil with 0.2g of anhydrous ethanol, mix the lavender essential oil with the biochar by spraying, and let it stand in a ventilated place for 1 hour until the ethanol completely evaporates to obtain biochar loaded with lavender essential oil.

[0061] S4. Weigh the following by weight percentage: 30% 100-mesh distiller's grains, 30% biochar loaded with essential oils, and 40% sodium bentonite. Put the three raw materials into a V-type material mixer and dry mix for 15 minutes until the color is uniform to obtain a mixed dry powder. Mix the mixed dry powder with deionized water at a mass ratio of 100:15, spraying and stirring at the same time, until it can be formed into a ball by hand and dispersed with a light touch.

[0062] S5. Granulation is carried out using a laboratory-scale screw extrusion granulator with a 4mm orifice.

[0063] S6. Place the extruded wet granules in a 60℃ forced-air drying oven and dry for 2 hours. After cooling, pass them through a 20-mesh sieve to remove smaller powder particles to obtain the finished product: distillers' grains-based slow-release aromatic deodorizing cat litter.

[0064] Comparative Example 1 Using only distillers' grains and sodium bentonite in a 60:40 ratio, without adding distillers' grains biochar or essential oils, and following the same preparation process as in Example 3, a common cat litter was obtained.

[0065] Comparative Example 2 Using only distillers' grains, distillers' grains biochar, and sodium bentonite in a 30:30:40 ratio, without adding essential oils, and following the same preparation process as in Example 3, a common cat litter was obtained.

[0066] The preparation of the distillers' grains-based slow-release aromatic deodorizing cat litter according to the embodiments of the present invention was characterized, and the specific process and results are as follows.

[0067] Figure 2 This is a visual representation of the preparation process of the distillers' grains, distillers' grains granules, distillers' grains biochar, essential oil biochar, and cat litter. It can be seen that after drying and pulverizing, the distillers' grains yield uniformly distributed yellow powdery distillers' grains granules with a large specific surface area and potential water absorption capacity. The distillers' grains granules are activated and carbonized to obtain uniform black powdery distillers' grains biochar, which is further loaded with essential oils to obtain essential oil biochar. Biochar can improve the adsorption and slow-release capacity of essential oils, prolonging the aroma time. In addition, the porous structure of biochar also has strong water absorption and deodorizing properties. The ternary composite cat litter has an overall black, round shape, with a diameter of 2mm~4mm and a length of 0.5cm~1.0cm. Finally, the ternary composite distillers' grains-based slow-release aromatic deodorizing cat litter granules are uniform in size.

[0068] Experiment 1 Bulk Density Detection Bulk density is the mass of cat litter per unit volume, reflecting its looseness and packaging efficiency. A graduated cylinder with a known volume V (mL) is tare on an analytical balance. Cat litter is then gently and evenly poured into the graduated cylinder through a funnel, and the surface is lightly leveled. The mass M (g) of the cat litter is then measured. The bulk density W is calculated using the following formula: Bulk density W = M / V

[0069] Figure 3 The bulk density refers to that of Examples 1-3 and Comparative Examples 1-2. The bulk density of Examples 1-3 and Comparative Examples 1-2 is 0.6-0.9 g / cm³. 3 Different ratios resulted in slight fluctuations in the bulk density of Examples 1-3 and Comparative Examples 1-2, but no significant differences.

[0070] Experiment 2 Water Absorption Rate Test The water absorption rate test measures the ability of a unit mass of cat litter to absorb clean water within a specified time, expressed as a percentage. Accurately weigh 10.0g of cat litter sample and place it in a dry graduated cylinder; slowly add 50mL of 25℃ deionized water using a pipette, and let it stand for 5 minutes; use filter paper to absorb the remaining unabsorbed water from the upper layer, and weigh the cat litter after water absorption, M (g); the water absorption rate is calculated using the following formula: Water absorption rate A (%) = (M-10) / 10 × 100%.

[0071] Figure 4 The absorbency of cat litter in Examples 1-3 and Comparative Examples 1-2 are shown. The absorbency rates of Examples 1-3 are 272%, 317%, and 292%, respectively, while the absorbency rates of Comparative Examples 1-2 are 263% and 296%, respectively. Example 2 has the highest absorbency rate, meeting the required standards.

[0072] Experiment 3 Collapse Rate Detection The breakage rate represents the cohesion strength, expressed as a percentage. Place cat litter in a container deeper than 20cm. Slowly add 20mL of 38℃ deionized water to the litter. After 1 minute, remove the clumps of litter and weigh them, recording the weight as G1. Then, drop the clumps of litter freely from a height of 50cm, collecting the broken pieces and weighing them, recording the weight as G2. The breakage rate represents the cohesion strength. The formula for calculating the breakage rate is: Breakage Rate B (%) = G2 / G1 × 100%

[0073] Figure 5 The breakdown rates of cat litter in Examples 1-3 and Comparative Examples 1-2 are shown. The breakdown rates of cat litter in Examples 1-3 increase sequentially, reaching 2.2%, 4.2%, and 6.6%, respectively. The breakdown rates of cat litter in Comparative Examples 1-2 are 3.0% and 3.5%, respectively. Although distillers' grains and biochar have good absorbency, their clumping ability is poor. Therefore, increasing the proportion of distillers' grains and biochar reduces the clumping ability of the cat litter. The breakdown rates of cat litter in Examples 1-2 are all <5%, meeting the required standards.

[0074] Experiment 4: Detection of Ammonia Adsorption Capacity The ability of cat litter to adsorb ammonia gas, a simulated odor source, in a closed environment reflects its deodorizing performance. A concentrated ammonia solution was used to simulate the odor source. At room temperature, 100g of cat litter sample was placed in an open plastic container, and 10mL of 5‰ ammonia solution was poured into the center of the litter. The container was then placed in a sealed box, immediately sealed, and the time was recorded for 60 minutes. Subsequently, the readings were recorded using an ammonia gas analyzer.

[0075] Scavenging rate C (%) = (Concentration before treatment - Concentration after treatment) / Concentration before treatment × 100% Figure 6 The ammonia adsorption capacity of cat litter in Examples 1-3 and Comparative Examples 1-2 is shown. The ammonia adsorption capacity of the cat litter in Examples 1-3 increases sequentially, reaching 61.0%, 73.6%, and 86%, respectively. In contrast, the ammonia adsorption capacities of the cat litter in Comparative Examples 1-2 are 49.3% and 52%, respectively. In the cat litter formulations of Examples 1-3, the proportions of distiller's grains granules and distiller's grains biochar increase sequentially, resulting in progressively higher adsorption capacities and thus improved ammonia removal capabilities. In Comparative Example 1, no distiller's grains biochar was added, leading to a significant decrease in ammonia removal capacity. This demonstrates the advantages of the ternary formulation of distiller's grains granules, distiller's grains biochar, and sodium-based bentonite used in this invention.

[0076] Experiment 5 Antibacterial performance test Essential oil-loaded biochar can impart certain antibacterial properties to cat litter. 10g of cat litter samples from Example 2 and Comparative Example 2 were placed in sterile beakers, and 1mL of *E. coli* or *Staphylococcus aureus* suspension was added and incubated for 2 hours. Subsequently, 90mL of sterile phosphate buffer was added, and the mixture was eluted. The diluted solution was spread onto solid agar medium, incubated at 37°C for 24 hours, photographed, and the surviving colonies were counted. 1mL of bacterial suspension without cat litter treatment was diluted with 90mL of sterile phosphate buffer and incubated as a blank control.

[0077] Figure 7 The antibacterial ability of cat litter in Example 2 and Comparative Example 2 is shown. It can be seen that bacteria grew extensively in the blank control group. In Comparative Example 2, bacteria also grew extensively, while in the bacterial solution treated in Example 2, bacterial growth was inhibited, with only a few colonies forming. This indicates that the finished sake lees-based slow-release aromatic deodorizing cat litter of Example 2, loaded with essential oils, effectively inhibited bacterial growth.

[0078] Conclusion: The test results show that the finished product of the distillers' grains-based slow-release aromatic deodorizing cat litter prepared in Examples 1-3 of this invention maintains good clumping properties, exhibits extremely excellent deodorizing ability and long-lasting aromatic slow-release function, and has significant antibacterial effect. Its comprehensive performance is far superior to that of the comparative product.

[0079] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A slow-release aromatic deodorizing cat litter based on distillers' grains, characterized in that, The following method was used to prepare the following: 40-100 mesh distiller's grains, distiller's grains biochar loaded with essential oil, and sodium bentonite were mixed, extruded and granulated, and dried to obtain the distiller's grains-based slow-release aromatic deodorizing cat litter. The weight percentages of the raw materials used in the preparation of distillers' grains-based slow-release aromatic deodorizing cat litter are as follows: 40-100 mesh distiller's grains 10%-40%, essential oil-loaded distiller's grains biochar 10%-40%, sodium bentonite 20%-80%, total 100%.

2. The distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 1, characterized in that, The preparation steps of essential oil-loaded distiller's grains biochar are as follows: 40-mesh distiller's grains were heated to 450℃~650℃ at 5℃ / min under an inert atmosphere for 2h~4h to obtain distiller's grains biochar. The essential oil was diluted with anhydrous ethanol to obtain anhydrous ethanol diluted essential oil; Essential oil diluted with anhydrous ethanol was blended with distillers' grains biochar to obtain distillers' grains biochar loaded with essential oil. The particle size of the biochar from the fermentation tank is 60 mesh to 100 mesh. The mass ratio of essential oil to distillers' lees biochar is (1~10):100; in the mixture of anhydrous ethanol and essential oil, the mass ratio of anhydrous ethanol to essential oil is 2:

1.

3. The distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 2, characterized in that, The essential oil is a natural plant essential oil, including one or more of lavender essential oil, cedarwood essential oil and green tea essential oil.

4. The distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 2, characterized in that, The inert atmosphere includes a nitrogen atmosphere.

5. The distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 2, characterized in that, The blending process involves mixing essential oil diluted with anhydrous ethanol with distillers' grains biochar via spraying, and then allowing it to stand for 1 to 4 hours.

6. The preparation method of the distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 1, characterized in that, Includes the following steps: The raw materials are mixed according to their weight percentages to obtain a mixed dry powder; The dry powder is mixed with deionized water to obtain a wet material; Wet materials are extruded and granulated to obtain wet granules with a particle size of 2mm to 4mm; The wet granules are dried to obtain distillers' grains-based slow-release aromatic deodorizing cat litter.

7. The method for preparing the distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 6, characterized in that, The mass ratio of the mixed dry powder to deionized water is 100:

15.

8. The method for preparing the distillers' grains-based slow-release aromatic deodorizing cat litter according to claim 6, characterized in that, The drying temperature is 40℃~60℃.

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